Court Opinion

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       United States Court of Appeals
                  FOR THE DISTRICT OF COLUMBIA CIRCUIT

Argued January 28, 2004                       Decided March 2, 2004

                               No. 00-1012

               UNITED STATES TELECOM ASSOCIATION,
                           PETITIONER

                                     v.

             FEDERAL COMMUNICATIONS COMMISSION AND
                  UNITED STATES OF AMERICA,
                         RESPONDENTS

           BELL ATLANTIC TELEPHONE COMPANIES, ET AL.,
                         INTERVENORS

                      Consolidated with
    00–1015, 00–1025, 01–1075, 01–1102, 01–1103, 03–1310,
    03–1311, 03–1312, 03–1313, 03–1314, 03–1315, 03–1316,
    03–1317, 03–1318, 03–1319, 03–1320, 03–1324, 03–1325,
    03–1326, 03–1327, 03–1328, 03–1329, 03–1330, 03–1331,
    03–1338, 03–1339, 03–1342, 03–1347, 03–1348, 03–1360,
    03–1372, 03–1373, 03–1385, 03–1391, 03–1393, 03–1394,
         03–1395, 03–1400, 03–1401, 03–1424, 03–1442
                          –————

 Bills of costs must be filed within 14 days after entry of judgment.
The court looks with disfavor upon motions to file bills of costs out
of time.
                             2

        On Petitions for Writ of Mandamus and for
                Review of an Order of the
          Federal Communications Commission

  Michael K. Kellogg argued the cause for ILEC petitioners.
With him on the briefs were Mark L. Evans, Sean A. Lev,
Colin S. Stretch, Michael T. McMenamin, James D. Ellis,
Paul K. Mancini, Joseph E. Cosgrove, Jr., Gary L. Phillips,
James P. Lamoureux, Robert B. McKenna, Charles R. Mor-
gan, James G. Harralson, William P. Barr, Michael E.
Glover, and Edward Shakin. Donna M. Epps, Daniel L.
Poole, John H. Harwood II, William R. Richardson, Jr., and
Matthew R. Sutherland entered appearances.
   Donald B. Verrilli, Jr. and Christopher J. Wright argued
the cause for CLEC petitioners. With them on the briefs
were Mark D. Schneider, Marc A. Goldman, Michael B.
DeSanctis, William Single IV, Jeffrey A. Rackow, David W.
Carpenter, David L. Lawson, C. Frederick Beckner III, An-
drew D. Lipman, Russell M. Blau, Richard M. Rindler,
Patrick J. Donovan, Harisha J. Bastiampillai, Dennis D.
Ahlers, Steven A. Augustino, Albert H. Kramer, Jonathan E.
Canis, Robert J. Aamoth, Carl S. Nadler, Adelia S. Borrasca,
Jason D. Oxman, Timothy J. Simeone, Charles C. Hunter,
Catherine M. Hannan, Genevieve Morelli, Glenn B. Manish-
in, Jonathan E. Canis, Teresa K. Gaugler, Jonathan Jacob
Nadler, and Jonathan D. Lee. Jennifer M. Kashatus, Paul
J. Rebey, Eric J. Branfman, Joshua M. Bobeck, and Angela
M. Simpson entered appearances.
   James Bradford Ramsay argued the cause for State peti-
tioners. With him on the briefs were Grace Delos Reyes,
Jonathan Feinberg, John L. Favreau, John C. Graham,
Helen M. Mickiewicz, Gretchen T. Dumas, Maryanne Reyn-
olds Martin, Christopher C. Kempley, Maureen A. Scott,
Michael A. Cox, Attorney General, Attorney General’s Office
of the State of Michigan, Thomas L. Casey, Solicitor General,
                              3

and David A. Voges and Michael Nickerson, Assistant Attor-
ney Generals.
  David C. Bergmann, Irwin A. Popowsky, Philip F. McClel-
land, Patricia A. Smith, Billy Jack Gregg, and F. Anne Ross
were on the briefs for petitioner National Association of State
Utility Consumer Advocates.
  John E. Ingle, Deputy Associate General Counsel, Federal
Communications Commission, and James M. Carr, Counsel,
argued the cause for respondents. With them on the brief
were R. Hewitt Pate, Assistant Attorney General, U.S. De-
partment of Justice, Catherine G. O’Sullivan and Nancy C.
Garrison, Attorneys, John A. Rogovin, General Counsel,
Federal Communications Commission, and Laurence N.
Bourne, Joel Marcus and Christopher L. Killion, Counsel.
Andrea Limmer, Attorney, U.S. Department of Justice, and
Lisa S. Gelb, Counsel, Federal Communications Commission,
entered appearances.
  Michael K. Kellogg argued the cause for ILEC intervenors
and Catena Networks, Inc. in support of respondents. With
him on the brief were Mark L. Evans, Aaron M. Panner,
Michael T. McMenamin, James D. Ellis, Paul K. Mancini,
Joseph E. Cosgrove, Jr., Gary L. Phillips, James P. Lamour-
eux, Robert B. McKenna, Charles R. Morgan, James G.
Harralson, William P. Barr, Michael E. Glover, Edward
Shakin, and Stephen L. Goodman. Alfred G. Richter, Hope
E. Thurrott, Lawrence E. Sarjeant, and Jonathan E. Canis
entered appearances.
  David W. Carpenter argued the cause for CLEC interve-
nors in support of respondents. With him on the brief were
Donald B. Verilli, Jr., Mark D. Schneider, Marc A. Gold-
man, Michael B. DeSanctis, William Single IV, Jeffrey A.
Rackow, David L. Lawson, C. Frederick Beckner III, Teresa
K. Gaugler, Charles C. Hunter, Catherine M. Hannan, An-
drew D. Lipman, Russell M. Blau, Richard M. Rindler,
Patrick J. Donovan, Harisha J. Bastiampillai, Albert H.
Kramer, Jonathan D. Lee, Carl S. Nadler, Adelia S. Borras-
ca, Janson D. Oxman, Robert J. Aamoth, Genevieve Morelli,
John T. Nakahata, Sara F. Leibman, John J. Heitmann,
                             4

Jennifer M. Kashatus, Christopher J. Wright, and Timothy
J. Simeone. Roy E. Hoffinger, Charles J. Cooper, Hamish
P. Hume, and Richard J. Metzger entered appearances.
   Jonathan Feinberg, John L. Favreau, John C. Graham,
Helen M. Mickiewicz, Gretchen T. Dumas, Maryanne Reyn-
olds Martin, Christopher C. Kempley, Maureen A. Scott,
Michael A. Cox, Attorney General, Attorney General’s Office
of the State of Michigan, Thomas L. Casey, Solicitor General,
David A. Voges and Michael Nickerson, Assistant Attorney
Generals, James Bradford Ramsay, and Grace Delos Reyes
were on the brief for State intervenors in support of respon-
dents.
  Laura H. Philips, Douglas G. Bonner, Michael            F.
McBride, Thomas J. Sugrue, Howard J. Symons, Sara         F.
Leibman, and Douglas I. Brandon were on the brief         of
Wireless intervenors in support of respondent. Brian      A.
Coleman entered an appearance.
 Before: EDWARDS and RANDOLPH, Circuit Judges, and
WILLIAMS, Senior Circuit Judge.
  Opinion for the Court filed by Senior Circuit Judge
WILLIAMS.
                      Table of Contents
  I. Legal Background TTTTTTTTTTTTTTTTTTTTTTTTTTTTTTT 6
 II. ILEC ObjectionsTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTT 11
     A. Unbundling of Mass Market SwitchesTTTTTTTTTT 11
          1. Subdelegation of § 251(d)(2) impairment
               determinations to state commissions TTTTTT 12
          2. Impairment in provision of mass market
               switchingTTTTTTTTTTTTTTTTTTTTTTTTTTTTTT 18
          3. The Commission’s definition of ‘‘impair-
               ment’’TTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTT 22
     B. Unbundling of High–Capacity Dedicated
            Transport Facilities TTTTTTTTTTTTTTTTTTTTTTTT 26
          1. Unlawfulness of the delegation to the
               states and the national impairment
               finding TTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTT 26
          2. Remaining dedicated transport issues TTTTTT 28
                              5

                a. Route-specific analysis of dedicated
                      transport TTTTTTTTTTTTTTTTTTTTTTTTTT 28
                b. Wireless providers’ access to unbun-
                      dled dedicated transport TTTTTTTTTTTTT 29
       C. Network Modification RequirementsTTTTTTTTTTT 33
III. CLEC Objections TTTTTTTTTTTTTTTTTTTTTTTTTTTTTTT 34
       A. Unbundling of Broadband Loops TTTTTTTTTTTTTT 34
            1. Hybrid loops TTTTTTTTTTTTTTTTTTTTTTTTTTTT 35
            2. Fiber-to-the-home (‘‘FTTH’’) loops TTTTTTTTT 42
            3. Line sharing TTTTTTTTTTTTTTTTTTTTTTTTTTTT 44
       B. Exclusion of ‘‘Entrance Facilities’’ TTTTTTTTTTTTT 46
       C. Unbundling of Enterprise Switches TTTTTTTTTTTT 47
       D. Unbundling of Call–Related Databases and
              Signaling Systems TTTTTTTTTTTTTTTTTTTTTTTTT 49
       E. Unbundling of Shared Transport Facilities TTTT 50
       F. Section 271 Pricing and Combination RulesTTTT 51
 IV. Unbundling of Enhanced Extended Links
         (‘‘EELs’’)TTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTT 54
       A. The Qualifying Service/Non–Qualifying Ser-
              vice DistinctionTTTTTTTTTTTTTTTTTTTTTTTTTTTT 56
       B. The EEL Eligibility Criteria TTTTTTTTTTTTTTTTT 58
  V. Miscellaneous TTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTT 59
       A. NASUCA’s Standing TTTTTTTTTTTTTTTTTTTTTTTT 59
       B. Ripeness of the State Preemption ClaimsTTTTTTT 60
 VI. Conclusion TTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTT 61
   WILLIAMS, Senior Circuit Judge: The Telecommunications
Act of 1996, Pub. L. 104–104, 110 Stat. 56, codified at 47
U.S.C. § 151 et seq. (the ‘‘Act’’), sought to foster a competi-
tive market in telecommunications. To enable new firms to
enter the field despite the advantages of the incumbent local
exchange carriers (‘‘ILECs’’), the Act gave the Federal Com-
munications Commission broad powers to require ILECs to
make ‘‘network elements’’ available to other telecommunica-
tions carriers, id. §§ 251(c)(3),(d), most importantly the com-
petitive local exchange carriers (‘‘CLECs’’). The most obvi-
ous candidates for such obligatory provision were the copper
wire loops historically used to carry telephone service over
the ‘‘last mile’’ into users’ homes. But Congress left to the
                              6

Commission the choice of elements to be ‘‘unbundled,’’ speci-
fying that in doing so it was to
    consider, at a minimum, whether TTT the failure to
    provide access to such network elements would impair
    the ability of the telecommunications carrier seeking
    access to provide the services that it seeks to offer.
Id. § 251(d)(2) (emphasis added).
   The Act became effective on February 8, 1996, a little more
than eight years ago. Twice since then the courts have
faulted the Commission’s efforts to identify the elements to
be unbundled. The Supreme Court invalidated the first
effort in AT&T Corp. v. Iowa Utilities Board, 525 U.S. 366,
389–90 (1999) (‘‘AT&T’’). We invalidated much of the second
effort (including separately adopted ‘‘line-sharing’’ rules) in
United States Telecom Association v. FCC, 290 F.3d 415
(D.C. Cir. 2002) (‘‘USTA I’’). The Commission consolidated
our remand in that case with its ‘‘triennial review’’ of the
scope of obligatory unbundling and issued the Order on
review here. See Report and Order and Order on Remand
and Further Notice of Proposed Rulemaking, Review of the
Section 251 Unbundling Obligations of Incumbent Local
Exchange Carriers, CC Docket Nos. 01–338 et al., FCC 03–
36, 18 FCC Rcd 16978 (Aug. 21, 2003) (‘‘Order’’); Errata,
Review of the Section 251 Unbundling Obligations of Incum-
bent Local Exchange Carriers, CC Docket Nos. 01–338 et al.,
FCC 03–227, 18 FCC Rcd 19020 (Sep. 17, 2003). Again,
regrettably, much of the resulting work is unlawful.
   After a brief summary of the legal background, we address
first the ILECs’ claims, then the CLECs’ claims, then the
ILEC and CLEC claims relating to a special area, enhanced
extended links (‘‘EELs’’), and finally a couple of miscellane-
ous claims.

                   I. Legal Background
  Section 251(c)(3) of the Act imposes on each ILEC the duty
to provide any requesting telecommunications carrier with
                                7

     access to network elements on an unbundled basis at any
     technically feasible point on rates, terms, and conditions
     that are just, reasonable, and nondiscriminatory in accor-
     dance with TTT the requirements of this section and
     section 252 of this title.
47 U.S.C. § 251(c)(3).
   The statute says that the ILECs may charge a ‘‘just and
reasonable rate’’ for these unbundled network elements
(‘‘UNEs’’), see id. § 252(d)(1), and the Commission adopted
as its standard ‘‘total element long-run incremental cost,’’ or
‘‘TELRIC.’’ Under this criterion UNE prices are to be
‘‘based on the use of the most efficient telecommunications
technology currently available and the lowest cost network
configuration, given the existing location of the incumbent
LEC’s wire centers.’’ 47 CFR § 51.505(b)(1). In litigation
over this pricing rule, which the Supreme Court upheld in
Verizon Communications v. FCC, 535 U.S. 467 (2002) (‘‘Veri-
zon’’), it appears to have been common ground that, because
of ongoing technological improvement (among other things),
prices so determined would fall well below the costs the
ILECs had actually historically incurred in constructing the
elements. Id. at 503–04, 508–09. Certainly the ardent pref-
erences of the parties as to the scope of the Act’s unbundling
requirements—the ILECs seeking a narrow reading, the
CLECs seeking a broad one—suggest such a relationship.
   In its first effort to interpret the ‘‘impairment’’ standard of
§ 251(d)(2), the Commission held that lack of unbundled
access to an element would ‘‘impair’’ a CLEC’s ability to
provide telecommunications service ‘‘if the quality of the
service the entrant can offer, absent access to the requested
element, declines and/or the cost of providing the service
rises.’’ Implementation of the Local Competition Provisions
in the Telecommunications Act of 1996, First Report and
Order, CC Docket No. 96–98, 11 FCC Rcd 15499, 15643
(1996) (‘‘First Report and Order’’), ¶ 285.
   The Supreme Court found this reading of ‘‘impair’’ unrea-
sonable in two respects. First, the Commission had irration-
ally refused to consider whether a CLEC could self-provision
                               8

or acquire the requested element from a third party. AT&T,
525 U.S. at 389. Second, the Commission had considered any
increase in cost or decrease in quality, no matter how small,
sufficient to establish impairment—a result the Court con-
cluded could not be squared with the ‘‘ordinary and fair
meaning’’ of the word ‘‘impair.’’ Id. at 389–90 & n.11. The
Court admonished the FCC that in assessing which cost
differentials would ‘‘impair’’ a new entrant’s competition with-
in the meaning of the statute, it must ‘‘apply some limiting
standard, rationally related to the goals of the Act.’’ Id. at
388.
   Responding to the AT&T decision, the Commission adopted
a new interpretation under which a would-be entrant is
‘‘impaired’’ if, ‘‘taking into consideration the availability of
alternative elements outside the incumbent’s network, includ-
ing self-provisioning by a requesting carrier or acquiring an
alternative from a third-party supplier, lack of access to that
element materially diminishes a requesting carrier’s ability
to provide the services it seeks to offer.’’ Implementation of
the Local Competition Provisions of the Telecommunications
Act of 1996, Third Report and Order and Fourth Further
Notice of Proposed Rulemaking, 15 FCC Rcd 3696, 3725
(1999) (‘‘Third Report and Order’’), ¶ 51 (emphasis added).
But in USTA I we held that this new interpretation of
‘‘impairment,’’ while an improvement, was still unreasonable
in light of the Act’s underlying purposes.
   The fundamental problem, we held, was that the Commis-
sion did not differentiate between those cost disparities that a
new entrant in any market would be likely to face and those
that arise from market characteristics ‘‘linked (in some de-
gree) to natural monopoly TTT that would make genuinely
competitive provision of an element’s function wasteful.’’
USTA I, 290 F.3d at 427. This distinction between different
kinds of incumbent/entrant cost differentials is qualitative, not
merely quantitative, which is why the Commission’s addition
of a requirement that the cost disparity be ‘‘material’’ was
inadequate. Id. at 427–28.
                               9

   We also made clear that the Commission’s broad and
analytically insubstantial concept of impairment failed to pur-
sue the ‘‘balance’’ between the advantages of unbundling (in
terms of fostering competition by different firms, even if they
use the very same facilities) and its costs (in terms both of
‘‘spreading the disincentive to invest in innovation and creat-
ing complex issues of managing shared facilities,’’ id. at 427),
a balance that we found implicit in the AT&T Court’s insis-
tence on an unbundling standard ‘‘rationally related to the
goals of the Act,’’ id. at 428 (quoting AT&T).
  We also objected to the Commission’s decision to issue,
with respect to most elements, broad unbundling require-
ments that would apply ‘‘in every geographic market and
customer class, without regard to the state of competitive
impairment in any particular market.’’ USTA I, 290 F.3d at
422. Though the Act does not necessarily require the Com-
mission to determine ‘‘on a localized state-by-state or market-
by-market basis which unbundled elements are to be made
available,’’ id. at 425 (quoting Third Report and Order, 15
FCC Rcd at 3753, ¶ 122), it does require ‘‘a more nuanced
concept of impairment than is reflected in findings TTT de-
tached from any specific markets or market categories.’’
USTA I, 290 F.3d at 426. Thus, the Commission is obligated
to establish unbundling criteria that are at least aimed at
tracking relevant market characteristics and capturing signifi-
cant variation.
   Finally, we vacated the Commission’s decision to require
ILECs to unbundle the high-frequency portion of their cop-
per loops to requesting CLECs—a practice known as ‘‘line
sharing’’ and used by CLECs to provide broadband DSL
service—because the Commission had failed to consider ade-
quately whether intermodal competition from cable providers
tilted the balance against this form of unbundling in the
broadband market.
  In response to USTA I the Commission again revised its
definition of impairment. This time around, the Commission
determined that a CLEC would ‘‘be impaired when lack of
access to an incumbent LEC network element poses a barrier
                              10

or barriers to entry, including operational and economic barri-
ers, that are likely to make entry into a market uneconomic.
That is, we ask whether all potential revenues from entering
a market exceed the costs of entry, taking into consideration
any countervailing advantages that a new entrant may have.’’
Order ¶ 84 (emphasis added). The Commission clarified that
the impairment assessment would take intermodal competi-
tion into account. Id. ¶ ¶ 97–98.
   The Commission responded to our demand for a more
‘‘nuanced’’ application of the impairment standard by purport-
ing to adopt a ‘‘granular’’ approach that would consider ‘‘such
factors as specific services, specific geographic locations, the
different types and capacities of facilities, and customer and
business considerations.’’ Id. ¶ 118. Where the Commission
believed that the record could not support an absolute nation-
al impairment finding but at the same time contained too
little information to make ‘‘granular’’ determinations, it
adopted a provisional nationwide rule, subject to the possibili-
ty of specific exclusions, to be created by state regulatory
commissions under a purported delegation of the Commis-
sion’s own authority.
   The Commission also resolved to use the ‘‘at a minimum’’
language in § 251(d)(2) to ‘‘inform [its] consideration of un-
bundling in contexts where some level of impairment may
exist, but unbundling appeared likely to undermine important
goals of the 1996 Act.’’ Id. ¶ 173. Specifically, in connection
with two broadband elements, ‘‘fiber-to-the-home’’ (‘‘FTTH’’)
and hybrid loops (see below), it brought into the balance the
risk that an unbundling order might deter investment in such
facilities—contrary, as it saw the matter, to the statutory goal
of encouraging prompt deployment of ‘‘advanced telecommu-
nications capability.’’ Id. ¶ ¶ 172–73 (quoting § 706 of the
Act). Additional issues also emerged in the rulemaking and
will be addressed below.
  The ILECs filed two mandamus petitions with this Court,
arguing that the Order violated our decision in USTA I, and
in addition filed a petition for review here. Various CLECs,
state commissions, and an association of state utility consum-
                              11

er advocates filed petitions for review in several other cir-
cuits; these petitions were transferred to the Eighth Circuit
under the random lottery procedure established in 28 U.S.C.
§ 2112(a)(3), and then transferred to this court by the Eighth
Circuit under 28 U.S.C. § 2112(a)(5). We consolidated the
petitions for review with the mandamus petitions.

                    II. ILEC Objections
A. Unbundling of Mass Market Switches
  The Commission made a nationwide finding that CLECs
are impaired without unbundled access to ILEC switches for
the ‘‘mass market,’’ consisting of residential and relatively
small business users. This finding was based primarily on
the costs associated with ‘‘hot cuts’’ (discussed below), which
must be performed when a CLEC provides its own switch.
Order ¶ ¶ 464–75. But the Commission, apparently con-
cerned that a blanket nationwide impairment determination
might be unlawfully overbroad in light of the record evidence
of substantial market-by-market variation in hot cut costs,
delegated authority to state commissions to make more ‘‘nu-
anced’’ and ‘‘granular’’ impairment determinations.
   First, the Commission directed the state commissions to
eliminate unbundling if a market contained at least three
competitors in addition to the ILEC, id. ¶ ¶ 498–503, or at
least two non-ILEC third parties that offered access to their
own switches on a wholesale basis, id. ¶ ¶ 504–05. For pur-
poses of this exercise the Commission gave the states virtual-
ly unlimited discretion over the definition of the relevant
market. Id. ¶ ¶ 495–97. Second, where these ‘‘competitive
triggers’’ are not met, the Commission instructed the states
to consider whether, despite the many economic and opera-
tional entry barriers deemed relevant by the Commission,
competitive supply of mass market switching was neverthe-
less feasible. Id. ¶ ¶ 494, 506–20. The Commission also
instructed the states to explore specific mechanisms to ame-
liorate or eliminate the costs of the ‘‘hot cut’’ process. Id.
¶ ¶ 486–90. The Commission mentioned, for example, the
possible use of ‘‘rolling’’ hot cuts, a process in which CLECs
                             12

could use ILEC switches for some time after a customer
selected the CLEC as its provider, and after an accumulation
of such customer changes, the ILEC would make all the
necessary hot cuts in one fell swoop. Id. ¶ ¶ 463, 521–24. If
a state failed to perform the requisite analysis within nine
months, the Commission would step into the position of the
state commission and do the analysis itself. Id. ¶ 190. Final-
ly, the Order provided that a party ‘‘aggrieved’’ by a state
commission decision could seek a declaratory ruling from the
Commission, though with no assurance when, or even wheth-
er, the Commission might respond. Id. ¶ 426; see also 47
CFR § 1.2.
  We consider first whether the Commission’s subdelegation
of authority to the state commissions is lawful. We conclude
that it is not. We then consider whether the Commission’s
nationwide impairment determination can nevertheless sur-
vive, even without the safety valve provided by subdelegation
to the states. We conclude that it cannot. We therefore
vacate the Commission’s decision to order unbundling of mass
market switches, subject to the stay discussed in Part VI.
  1. Subdelegation of § 251(d)(2) impairment determina-
      tions to state commissions
   The FCC acknowledges that § 251(d)(2) instructs ‘‘the
Commission’’ to ‘‘determine[ ]’’ which network elements shall
be made available to CLECs on an unbundled basis. But it
claims that agencies have the presumptive power to subdele-
gate to state commissions, so long as the statute authorizing
agency action refrains from foreclosing such a power. Given
the absence of any express foreclosure, the Commission ar-
gues that its interpretation of the statute on the matter of
subdelegation is entitled to deference under Chevron U.S.A.
v. Natural Resources Defense Council, 467 U.S. 837 (1984).
And it claims that its interpretation is reasonable given the
state commissions’ independent jurisdiction over the general
subject matter, the magnitude of the regulatory task, and the
need for close cooperation between state and federal regu-
lators in this area.
                              13

   The Commission’s position is based on a fundamental mis-
reading of the relevant case law. When a statute delegates
authority to a federal officer or agency, subdelegation to a
subordinate federal officer or agency is presumptively per-
missible absent affirmative evidence of a contrary congres-
sional intent. See United States v. Giordano, 416 U.S. 505,
512–13 (1974); Fleming v. Mohawk Wrecking & Lumber Co.,
331 U.S. 111, 121–22 (1947); Halverson v. Slater, 129 F.3d
180, 185–86 (D.C. Cir. 1997); United States v. Mango, 199
F.3d 85, 90–91 (2d Cir. 1999); Inland Empire Pub. Lands
Council v. Glickman, 88 F.3d 697, 702 (9th Cir. 1996); United
States v. Widdowson, 916 F.2d 587, 592 (10th Cir. 1990),
vacated on other grounds, 502 U.S. 801 (1991). But the cases
recognize an important distinction between subdelegation to a
subordinate and subdelegation to an outside party. The
presumption that subdelegations are valid absent a showing
of contrary congressional intent applies only to the former.
There is no such presumption covering subdelegations to
outside parties. Indeed, if anything, the case law strongly
suggests that subdelegations to outside parties are assumed
to be improper absent an affirmative showing of congression-
al authorization. See Shook v. District of Columbia Fin.
Responsibility & Mgmt Assistance Auth., 132 F.3d 775, 783–
84 & n.6 (D.C. Cir. 1998). See also Nat’l Ass’n of Reg. Util.
Comm’rs (‘‘NARUC’’) v. FCC, 737 F.2d 1095, 1143–44 & n.41
(D.C. Cir. 1984); Nat’l Park and Conservation Ass’n v.
Stanton, 54 F. Supp. 2d 7, 18–20 (D.D.C. 1999). (We discuss
below some cases that might, mistakenly, be thought to
support a contrary view.)
   This distinction is entirely sensible. When an agency
delegates authority to its subordinate, responsibility—and
thus accountability—clearly remain with the federal agency.
But when an agency delegates power to outside parties, lines
of accountability may blur, undermining an important demo-
cratic check on government decision-making. See NARUC,
737 F.2d at 1143 n.41; cf. Printz v. United States, 521 U.S.
898, 922–23 (1997). Also, delegation to outside entities in-
creases the risk that these parties will not share the agency’s
‘‘national vision and perspective,’’ Stanton, 54 F. Supp. 2d at
                              14

20, and thus may pursue goals inconsistent with those of the
agency and the underlying statutory scheme. In short, sub-
delegation to outside entities aggravates the risk of policy
drift inherent in any principal-agent relationship.
   The fact that the subdelegation in this case is to state
commissions rather than private organizations does not alter
the analysis. Although United States v. Mazurie, 419 U.S.
544 (1975), noted that ‘‘limits on the authority of Congress to
delegate its legislative power TTT are [ ] less stringent in
cases where the entity exercising the delegated authority
itself possesses independent authority over the subject mat-
ter,’’ id. at 556–57 (emphasis added), that decision has no
application here: it involved a constitutional challenge to an
express congressional delegation, rather than an administra-
tive subdelegation, and the point of the discussion was to
distinguish the still somewhat suspect case of congressional
delegation to purely private organizations.
  Two Ninth Circuit cases have invoked Mazurie to suggest
that limitations on an administrative agency’s power to sub-
delegate might be less stringent if the delegee is a sovereign
entity rather than a private group. See Assiniboine & Sioux
Tribes v. Bd. of Oil and Gas, 792 F.2d 782, 795 (9th Cir.
1986); Southern Pacific Transp. Co. v. Watt, 700 F.2d 550,
556 (9th Cir. 1983). But in neither of these cases was this
principle necessary to the outcome, and in neither did the
court seek to justify the extension of Mazurie from its
context—the validity of an express delegation of Congress’s
powers.
  We therefore hold that, while federal agency officials may
subdelegate their decision-making authority to subordinates
absent evidence of contrary congressional intent, they may
not subdelegate to outside entities—private or sovereign—
absent affirmative evidence of authority to do so.
  The Commission’s plea for Chevron deference is unavailing.
A general delegation of decision-making authority to a federal
administrative agency does not, in the ordinary course of
things, include the power to subdelegate that authority be-
yond federal subordinates. It is clear here that Congress has
                             15

not delegated to the FCC the authority to subdelegate to
outside parties. The statutory ‘‘silence’’ simply leaves that
lack of authority untouched. In other words, the failure of
Congress to use ‘‘Thou Shalt Not’’ language doesn’t create a
statutory ambiguity of the sort that triggers Chevron defer-
ence. See Ry. Labor Exec. Ass’n v. Nat. Mediation Bd., 29
F.3d 655, 671 (D.C. Cir. 1994) (‘‘Were courts to presume a
delegation of power absent an express withholding of such
power, agencies would enjoy virtually limitless hegemony, a
result plainly out of keeping with Chevron and quite likely
with the Constitution as well.’’); see also Aid Ass’n for
Lutherans v. U.S. Postal Service, 321 F.3d 1166, 1174–75
(D.C. Cir. 2003); Motion Picture Ass’n of Am. v. FCC, 309
F.3d 796, 801 (D.C. Cir. 2002); Ethyl Corp. v. EPA, 51 F.3d
1053, 1060 (D.C. Cir. 1995).
   The FCC invokes a number of other cases in support of its
idea of a presumptive authority to subdelegate to entities
other than subordinates. These are inapposite because they
do not involve subdelegation of decision-making authority.
They merely recognize three specific types of legitimate
outside party input into agency decision-making processes:
(1) establishing a reasonable condition for granting federal
approval; (2) fact gathering; and (3) advice giving. The
scheme established in the Order fits none of these models.
   First, a federal agency entrusted with broad discretion to
permit or forbid certain activities may condition its grant of
permission on the decision of another entity, such as a state,
local, or tribal government, so long as there is a reasonable
connection between the outside entity’s decision and the
federal agency’s determination. Thus in United States v.
Matherson, 367 F. Supp. 779, 782–83 (E.D.N.Y. 1973), aff’d
493 F.2d 1339 (2d Cir. 1974), the court upheld the decision of
the Fire Island National Seashore Superintendent to condi-
tion issuance of federal seashore motor vehicle permits on the
applicant’s acquisition of an analogous permit from an adja-
cent town. And Southern Pacific, 700 F.2d at 556, citing
Matherson, sustained the Secretary of Interior’s conditioning
of right-of-way permits across tribal lands on the tribal
government’s approval. In contrast to these cases, where an
                              16

agency with broad permitting authority had adopted an obvi-
ously relevant local concern as an element of its decision
process, the Commission here has delegated to another actor
almost the entire determination of whether a specific statuto-
ry requirement—impairment—has been satisfied.
   Second, there is some authority for the view that a federal
agency may use an outside entity, such as a state agency or a
private contractor, to provide the agency with factual infor-
mation. While Assiniboine & Sioux Tribes found that a
delegation of decision-making power to a state board would
be unlawful, it left open whether reliance by the federal
agency on the state board for ‘‘nondiscretionary activities
such as compiling, hearing, and transmitting technical infor-
mation might not be permissible and desirable.’’ 792 F.2d at
795. And National Association of Psychiatric Treatment v.
Mendez, 857 F. Supp. 85, 91 (D.D.C. 1994), upheld a federal
certifying agency’s decision to hire a private contractor to
conduct surveys of residential treatment centers and pass its
results on to the agency, which retained final certification
authority. While the FCC has sought to characterize the
state commissions’ role here as fact finding, see Order ¶ ¶ 186,
493, in fact the Order lets the states make crucial decisions
regarding market definition and application of the FCC’s
general impairment standard to the specific circumstances of
those markets, with FCC oversight neither timely nor as-
sured. The Commission’s attempted punt does not remotely
resemble nondiscretionary information gathering.
   Our own decision in Tabor v. Joint Board for Enrollment of
Actuaries, 566 F.2d 705, 708 n.5 (D.C. Cir. 1977), seems to
straddle the two above variants of permissible relationships.
There the federal Joint Board for Enrollment of Actuaries,
exercising its broad discretion to set conditions for certifying
actuaries to administer ERISA pension plans, required appli-
cants either to pass a Board exam or to pass an exam
administered by one of the recognized private national actuar-
ial societies. 566 F.2d at 708 n.5. The court found that the
process was ‘‘superintended by the Board in every respect,’’
and that the Board had not abdicated its decision-making
authority but merely created a reasonable ‘‘short-cut,’’ contin-
                             17

gent on the approval of certain private organizations, to
satisfy one of the Board’s own regulatory requirements. Id.
The opinions in both Southern Pacific (from our first catego-
ry) and Mendez (from our second) invoke Tabor.
   Neither Tabor nor its progeny relied on any principle that
subdelegations to outside parties were presumptively valid,
since the result in each of these cases was supportable on the
theory that no subdelegation of decision-making authority had
actually taken place. To the extent that Tabor’s citation of
United States v. Giordano, 416 U.S. 505, 512–13 (1974), might
be thought to suggest that external delegations enjoy the
same favorable presumption as internal ones, that suggestion
was clearly rejected by our decision in Shook, 132 F.3d at
783–84 & n.6.
   Third, a federal agency may turn to an outside entity for
advice and policy recommendations, provided the agency
makes the final decisions itself. Thus in Shook, 132 F.3d at
784, we disapproved the D.C. Control Board’s delegation of
governance powers over D.C. schools to a private Board of
Trustees, but we suggested that the Control Board could use
an entity of that sort ‘‘as an advisory board charged with
recommending certain actions and policies to the Control
Board.’’ See also Stanton, 54 F. Supp. 2d at 19–20 & n.6;
Mendez, 857 F. Supp. at 91. An agency may not, however,
merely ‘‘rubber-stamp’’ decisions made by others under the
guise of seeking their ‘‘advice,’’ see Assiniboine & Sioux
Tribes, 792 F.2d at 795, nor will vague or inadequate asser-
tions of final reviewing authority save an unlawful subdelega-
tion, see Stanton, 54 F. Supp. 2d at 19, 20–21.
   Finally, the Commission’s claim that Diamond Internation-
al Corp. v. FCC, 627 F.2d 489, 492–93 (D.C. Cir. 1980), and
New York Telephone Co. v. FCC, 631 F.2d 1059, 1065 (2d Cir.
1980), uphold ‘‘virtually indistinguishable’’ FCC subdel-
egations to state commissions, FCC Br. at 25, is (or should
be) embarrassing. These cases involved a wholly unrelated
issue: whether the FCC properly interpreted the Communi-
cations Act when it decided to permit carriers to file state
tariffs for local services used in connection with interstate
                              18

services. The issue was not delegation of federal authority
but rather the scope of federal authority to preempt state
authority.
   We note that the ILEC petitioners invoke standard expres-
sio unius reasoning to attack the delegation. They point out
that other provisions of the Act—e.g., the procedures for
arbitration and approval of agreements under § 252—ex-
pressly specify a state role, and urge us to infer congressional
preclusion of such a role under § 251(d)(2). We do not rely
on this theory. Our conclusion would be unchanged if no
provision of the Act mentioned any role for the state commis-
sions, because the general conferral of regulatory authority
does not empower an agency to subdelegate to outside par-
ties. That said, the fact that other provisions of the statute
carefully delineate a particular role for the state commissions,
but § 251(d)(2) does not, reassures us that the our result is
consistent with congressional intent.
   We therefore vacate, as an unlawful subdelegation of the
Commission’s § 251(d)(2) responsibilities, those portions of
the Order that delegate to state commissions the authority to
determine whether CLECs are impaired without access to
network elements, and in particular we vacate the Commis-
sion’s scheme for subdelegating mass market switching deter-
minations. (This holding also requires that we vacate the
Commission’s subdelegation scheme with respect to dedicated
transport elements, discussed below.) We now turn to
whether, without that safety valve, the FCC’s national impair-
ment findings for mass market switches can be reconciled
with USTA I.
  2. Impairment in provision of mass market switching
   Without the (unlawful) innovation of transforming a nation-
al impairment finding into a provisional national impairment
finding from which state commissions could deviate if they
found no impairment under local market conditions, the
FCC’s Order on mass market switches must stand or fall as a
nationwide determination that CLECs are impaired in the
mass market without unbundled access to ILEC switches.
After reviewing the record, we conclude that we must vacate
                              19

the (no longer provisional) national impairment finding as
inconsistent with our conclusion in USTA I that the Commis-
sion may not ‘‘loftily abstract[ ] away from all specific mar-
kets,’’ 290 F.3d at 423, but must instead implement a ‘‘more
nuanced concept of impairment,’’ id. at 426.
   The Commission’s national finding of impairment for mass
market switches is based on entry barriers related to the
need for ILECs to perform ‘‘hot cuts’’ (manual connections)
for CLECs if the latter choose to self-provision mass market
switches. See Order ¶ ¶ 459, 464–76. A ‘‘hot cut’’ requires an
ILEC technician to physically disconnect a customer loop
from the ILEC switch (to which the loop was hard-wired) and
re-wire the loop to the CLEC switch, while simultaneously
reassigning the customer’s phone number from the ILEC
switch to the CLEC switch. Order ¶ 465 n.1409. A hot cut
must be performed every time a CLEC seeks to connect a
new customer. In contrast, ILEC connection of a customer
generally only requires a software change (unless the custom-
er had already switched to a CLEC switch, in which case the
hot cut must be undone via the same physical re-connection).
Order ¶ 465. The Commission explains that, according to
evidence in the record, the need to perform hot cuts can delay
a CLEC in providing service with its own switch and can
cause service disruptions, and that these delays and disrup-
tions, even if minor, can damage customer perceptions of
CLEC service and impede the CLECs’ ability to compete.
Order ¶ ¶ 466–67.
   Though the Commission in its brief alludes to ‘‘other opera-
tional and economic factors’’ that might create barriers to
competition in mass market switching, FCC Br. at 36, the
Order makes clear that the national impairment finding was
based solely on hot cuts. Order ¶ ¶ 459 n.1405 & 476. (The
other factors were to be considered by state commissions in
the exercise of the unlawfully delegated authority.) There
appears to be no suggestion that mass market switches
exhibit declining average costs in the relevant markets, or
even that switches entail large sunk costs. The Commission
nonetheless concluded that hot cut costs are not the sort of
cost disparity that a new entrant into any market might face,
                              20

since they arise due to the fact that ‘‘incumbent LECs’
networks were designed for use in a single carrier, non-
competitive environment,’’ which means that CLECs face
operational costs that the ILECs do not. Order ¶ 465.
   Though certain sections of the Order suggest that impair-
ment due to hot cut costs might be sufficiently widespread to
support a general national impairment finding even in the
absence of more ‘‘nuanced’’ determinations to be made by the
state commissions, Order ¶ ¶ 459, 470, 473, the Commission at
other points concludes that a national finding, without the
possibility of market-specific exceptions authorized by state
commissions, would be inconsistent with USTA I. See Order
¶ ¶ 186–88, 196, 425, 485, 493. At the very least, these latter
passages demonstrate that the Commission’s own conclusions
do not clearly support a non-provisional national impairment
finding for mass market switches, and thus require us to
vacate and remand.
   Moreover, we doubt that the record supports a national
impairment finding for mass market switches. In another
context the Commission has already addressed a kindred
issue. Under § 271 of the Act, the subset of ILECs that
used to be operating companies of AT&T before its break-up
(the Bell Operating Companies, or ‘‘BOCs’’) can enter the
interLATA market (the market for calls between different
local access and transport areas) only by showing, among
other things, that they are providing CLECs adequate un-
bundled access to various network elements, including local
loops. See Act § 271(c)(2)(B)(iv). The Commission acknowl-
edges that in that context it has in fact found that the BOCs
were doing so ‘‘in the quantities that competitors demand and
at an acceptable level of quality,’’ see, e.g., Memorandum
Opinion and Order, Application by SBC Communications,
Inc., et al., Pursuant to Section 271 of the Telecommunica-
tions Act of 1996 To Provide In–Region, InterLATA Services
in Texas, 15 FCC Rcd 18354, 18480 (2000), ¶ 247; Memoran-
dum Opinion and Order, Application of Ameritech Michigan
Pursuant to Section 271 of the Communications Act of 1934,
as Amended, To Provide In–Region, InterLATA Services in
Michigan, 12 FCC Rcd 20543, 20601–02 (1997), ¶ 110. In
                              21

none of those proceedings did the Commission find the hot
cut process inadequate to meet this standard. See Separate
Statement of Chairman Michael K. Powell Approving in Part
and Dissenting in Part, FCC 03–36 (‘‘Powell Statement’’) at 4.
But it distinguished those cases on the ground of uncertainty
about whether ILECs would be able to handle the increases
in hot cut demand that would flow from denying CLECs
access to switches as UNEs. Order ¶ 469 & n.1435. The
ILECs contend that in fact hot cut processes are ‘‘scalable,’’
so that existing sufficiency can be projected onto larger-scale
usage. See ILEC Br. at 16 (citing Powell Statement at 5;
Memorandum Opinion and Order, Application by Bell Atlan-
tic New York for Authorization Under Section 271 of the
Communications Act to Provide In–Region, InterLATA Ser-
vice in the State of New York, 15 FCC Rcd 3953, 4114 (1999),
¶ 308).
   The record on the matter is mixed, perhaps sufficiently so
that the Commission’s ‘‘provisional’’ assumption to the con-
trary might be sustainable as an absolute finding, given the
deference we would owe the Commission’s predictive judg-
ment and the inevitability of some over- and under-
inclusiveness in the Commission’s unbundling rules. But the
Commission implicitly conceded that hot cut difficulties could
not support an undifferentiated nationwide impairment find-
ing. Order ¶ ¶ 425, 485, 493. Moreover, we made clear in
USTA I that the Commission cannot proceed by very broad
national categories where there is evidence that markets vary
decisively (by reference to its impairment criteria), at least
not without exploring the possibility of more nuanced alterna-
tives and reasonably rejecting them. 290 F.3d at 425–26.
One can imagine the Commission successfully identifying
criteria based, for example, on an ILEC’s track record for
speed and volume in a market, integrated with some projec-
tion of the demand increase that would result from withhold-
ing of switches as UNEs. The Commission, however, has
made no visible effort to explore such possibilities.
   Additionally, the ILEC petitioners suggested several more
narrowly-tailored alternatives to a blanket requirement that
mass market switches be made available as UNEs. Consid-
ering such narrower alternatives is essential in light of our
admonition in USTA I that the Commission must balance the
                             22

costs and benefits of unbundling. 290 F.3d at 429. ‘‘Rolling’’
hot cuts are one such proffered alternative. Under that
concept the Commission could require unbundled access to
ILEC switching on new lines for 90 days (or some other
period of time) in order to give the ILEC time to perform the
accumulated backlog of hot cuts simultaneously, Order
¶ ¶ 463, 521–24, or the Commission could require the ILEC to
provide unbundled access to its switch only until it was able
to perform the hot cut. The FCC’s only real answer to these
proposed alternatives, at least the only answer that appears
in the Order or the FCC’s brief, is that the Commission
directed the state commissions to consider these alternatives
and to implement them if they would remedy impairment.
See FCC Br. at 38–39; Order ¶ ¶ 463, 521–24. But since we
have held such subdelegation unlawful, that response is un-
available.
   Moreover, even if the FCC had adopted some lawful mech-
anism for making exemptions from its general national rule, it
could not necessarily rely on the existence of that mechanism
as the sole justification for not adopting a more narrowly
tailored rule. While a rational rule that would otherwise be
impermissibly broad can be saved by ‘‘safety valve’’ waiver or
exception procedures, the mere existence of a safety valve
does not cure an irrational rule. See ICORE, Inc. v. FCC,
985 F.2d 1075, 1080 (D.C. Cir. 1993); Alltel Corp. v. FCC, 838
F.2d 551, 561–62 (D.C. Cir. 1988). And a rule is irrational in
this context if a party has presented to the agency a narrower
alternative that has all the same advantages and fewer disad-
vantages, and the agency has not articulated any reasonable
explanation for rejecting the proposed alternative.
  We therefore vacate the FCC’s determination that ILECs
must make mass market switches available to CLECs as
UNEs, subject to the stay discussed in Part VI below, and
remand to the Commission for a re-examination of the issue.
  3. The Commission’s definition of ‘‘impairment’’
  The Commission claims that no party in this litigation has
challenged the concept embodied in its new interpretation of
                              23

‘‘impairment.’’ All the disputes, it says, are about the proper
implementation of that standard. FCC Br. at 18. Not
exactly. For example, although the ILEC petitioners’ objec-
tions to the Commission’s mass market switching provisions
are all within the framework of the Commission’s subdelega-
tion scheme, a number of them clearly go to the character of
the impairment standard embodied in that scheme.
   As a general matter the ILECs argue the Commission’s
impairment standard is so open-ended that it imposes no
meaningful constraints on unbundling, and would be unlawful
even if applied by the FCC itself. ILEC Br. at 28; see also
Separate Statement of Commissioner Kathleen Q. Abernathy
Approving in Part and Dissenting in Part, FCC 03–36 at 6–7
& n. 16 (claiming that the Commission’s multifactor test is no
different from the totality-of-the-circumstances approach
struck down in USTA I). More specifically, the ILECs claim
that the Commission’s unbundling test unlawfully permits
states to consider as a potential source of impairment retail
rates that are held below cost by state regulation against the
ILECs’ will, and unlawfully precludes consideration of inter-
modal competition when determining whether a market is
suitable for competitive supply.
   On the general point about the open-endedness of the
Commission’s standard, we observe that the Order’s interpre-
tation of impairment is an improvement over the Commis-
sion’s past efforts in that, for the most part, the Commission
explicitly and plausibly connects factors to consider in the
impairment inquiry to natural monopoly characteristics (de-
clining average costs throughout the range of the relevant
market), see Order ¶ ¶ 75–76 & nn.245, 256, 258–59, ¶ 87 &
n.283, or at least connects them (in logic that the ILECs do
not seem to contest) to other structural impediments to
competitive supply. These barriers include sunk costs (Order
¶ 75 & n.244, ¶ ¶ 76, 80, 86, 88), ILEC absolute cost advan-
tages (Order ¶ 75 & n.247, ¶ 90 & n.302), first-mover advan-
tages (Order ¶ 75 & n.249, ¶ 89), and operational barriers to
entry within the sole or primary control of the ILEC (Order
¶ 91). In contrast to the First Report and Order and the
Third Report and Order, the Commission has clarified that
                              24

only costs related to structural impediments to competition
are relevant to the impairment analysis.
  In light of our remand, this is not the occasion for any
review of the Commission’s impairment standard as a general
matter; it finds concrete meaning only in its application, and
only in that context is it readily justiciable. A few general
observations are pertinent, however.
   Relation of ‘‘impairment’’ to the ‘‘at a minimum’’ clause.
We note that there are at least two ways in which the
Commission could have accommodated our ruling in USTA I
that its impairment rule take into account not only the
benefits but also the costs of unbundling (such as discourage-
ment of investment in innovation), in order that its standard
be ‘‘rationally related to the goals of the Act.’’ See USTA I,
290 F.3d at 428. One way would be to craft a standard of
impairment that built in such a balance, as for example by
hewing rather closely to natural monopoly features. The
other is to use a looser concept of impairment, with the costs
of unbundling brought into the analysis under § 251(d)(2)’s
‘‘at a minimum’’ language. The Commission has chosen the
latter, and we cannot fault it for doing so. This is especially
true as the statutory structure suggests that ‘‘impair’’ must
reach a bit beyond natural monopoly. While for ‘‘proprie-
tary’’ network elements the statute mandates a decision
whether they are ‘‘necessary,’’ § 251(d)(1)(A), for non-
proprietary ones it requires a decision whether their absence
would ‘‘impair’’ the requester’s provision of telecommunica-
tions service, § 251(d)(1)(B). Thus, in principle, there is no
statutory offense in the Commission’s decision to adopt a
standard that treats impairment as a continuous rather than
as a dichotomous variable, and potentially reaches beyond
natural monopoly, but then to examine the full context before
ordering unbundling.
   That said, we do note that in at least one important respect
the Commission’s definition of impairment is vague almost to
the point of being empty. The touchstone of the Commis-
sion’s impairment analysis is whether the enumerated opera-
tional and entry barriers ‘‘make entry into a market uneco-
                               25

nomic.’’ Order ¶ 84. Uneconomic by whom? By any CLEC,
no matter how inefficient? By an ‘‘average’’ or ‘‘representa-
tive’’ CLEC? By the most efficient existing CLEC? By a
hypothetical CLEC that used ‘‘the most efficient telecommu-
nications technology currently available,’’ the standard that is
built into TELRIC? Compare 47 CFR § 51.505(b)(1). We
need not resolve the significance of this uncertainty, but we
highlight it because we suspect that the issue of whether the
standard is too open-ended is likely to arise again.
   Intermodal alternatives. As for the ILECs’ claim that the
Commission’s impairment standard unlawfully excludes con-
sideration of intermodal alternatives, we observe that the
Commission expressly stated that such alternatives are to be
considered when evaluating impairment. Order ¶ ¶ 97–98,
443. Whether the weight the FCC assigns to this factor is
reasonable in a given context is an question that we need not
decide, except insofar as we reaffirm USTA I’s holding that
the Commission cannot ignore intermodal alternatives. 290
F.3d at 429.
   Impairment in markets where state regulation holds rates
below historic costs. In the name of ‘‘universal service,’’ state
regulators have commonly employed cross-subsidies, tilting
rate ceilings so that revenues from business and urban cus-
tomers subsidize residential and rural ones. USTA I, 290
F.3d at 422. On remand from our decision in USTA I, the
Commission decided to consider regulated below-cost retail
rates as a factor that may ‘‘impair’’ CLECs in competing for
mass market customers. See Order ¶ 518. The ILECs
object strenuously, and it appears virtually certain that the
issue will recur on remand.
   The Commission’s brief treatment of the issue makes no
attempt to connect this ‘‘barrier’’ to entry either with struc-
tural features that would make competitive supply wasteful or
with any other purposes of the Act (other than, implicitly, the
purpose of generating ‘‘competition,’’ no matter how synthet-
ic). The Commission rightly says that if prevailing rates are
too low to elicit CLEC entry even with the benefit of UNEs,
the unbundling mandate will have no consequences. True
                               26

enough. But it is no defense of a rule to say that it is
harmless in those cases where it has no effect at all; that
presumably is true even of the most absurd rule.
   The interesting case is the one where TELRIC rates are so
low that unbundling does elicit CLEC entry, enabling CLECs
to cut further into ILEC revenues in areas where the ILECs’
service is mandated by state law—and mandated to be of-
fered at artificially low rates funded by ILECs’ supracompeti-
tive profits in other areas. If the scheme of the Act is
successful, of course, the very premise of these below-cost
rate ceilings will be undermined, as those supracompetitive
profits will be eroded by Act-induced competition. In com-
petitive markets, an ILEC can’t be used as a pi˜ata. The
                                                    n
Commission has said nothing to address these obvious impli-
cations, or otherwise to locate its treatment of the issue in
any purposeful reading of the Act.
  We recognize, of course, that the historic accounting costs
relied upon by state regulators are, like TELRIC itself, an
artificial construct that may not closely track true economic
cost. But that is no justification for the Commission’s refusal
to evaluate the probable consequences of its approach, and to
adopt, in the light of those estimations, a policy that it can
reasonably say advances the goals of the Act.
B. Unbundling of High–Capacity Dedicated Transport Fa-
   cilities
  1. Unlawfulness of the delegation to the states and the
     national impairment finding
   The Commission has made multiple impairment findings
with respect to dedicated transport elements (transmission
facilities dedicated to a single customer or carrier), varying
the findings by capacity level. First, it found that competing
providers are not impaired without unbundled access to
‘‘OCn’’ transport facilities (very high-capacity transport facili-
ties or bandwiths within such facilities), Order ¶ ¶ 359, 372,
and all petitioners appear to accept that finding. Second, the
Commission found that competitors are impaired without
unbundled access to DS1 transport, DS3 transport, and dark
                               27

fiber transport, but made this nationwide impairment finding
subject to variation by state commissions applying specific
‘‘competitive triggers.’’ Id. ¶ 359; see also id. ¶ ¶ 381–93.
Explaining this latter decision, the Commission observed that
its nationwide impairment findings for DS1, DS3, and dark
fiber were based on ‘‘aggregated data’’ and frankly acknowl-
edged that competitive alternatives are available ‘‘in some
locations.’’ Id. ¶ 398. The Commission declared that it did
not need to resolve ‘‘the factual identification of where alter-
native facilities existTTTT [B]ecause we recognize that the
record is insufficiently detailed to make more precise findings
regarding impairment, we delegate to the states, subject to
appeal back to this Commission if a state fails to act, a fact-
finding role to determine on a route-specific basis where
alternatives to the incumbent LECs’ networks exist such that
competing carriers are no longer impaired.’’ Id. ¶ 398.
   Specifically, the Commission instructed states to apply two
competitive triggers on a route-by-route basis. Id. ¶ ¶ 399–
401. First, the ‘‘self-provisioning’’ trigger required states to
find no impairment if three or more competitors had deployed
non-ILEC transport facilities along a specific route. Id.
¶ ¶ 400, 405–09. Second, the ‘‘wholesale facilities’’ trigger
required states to find no impairment if two or more compet-
ing carriers were immediately able and willing to sell trans-
port along a given route at wholesale rates. Id. ¶ ¶ 400, 412–
16. Even where the triggers were not satisfied, the FCC
allowed a finding of non-impairment if a state, applying seven
criteria (all quite fluid and none quantified), determined that
the route was suitable for multiple competitive supply. Id.
¶ 410. If a state believed that there was impairment on a
specific route despite facial satisfaction of the self-
provisioning trigger, it could petition the Commission for a
waiver. Id. ¶ 411.
   As we explained in the mass market switching context, the
Commission may not subdelegate its § 251(d) authority to
state commissions. Although the Commission characterizes
the states’ role as ‘‘fact-finding,’’ Order ¶ 394, the character-
ization is fictitious. It is the states, not the FCC, that
determine whether the competitive triggers, or the Commis-
                               28

sion’s numerous and largely unquantified alternative criteria,
are satisfied; it is the states that issue binding orders, subject
only to the Commission’s discretionary review. And, as with
mass market switching, the Order itself suggests that the
Commission doubts a national impairment finding is justified
on this record. Id. ¶ ¶ 360, 394, 398. We therefore vacate
the national impairment findings with respect to DS1, DS3,
and dark fiber and remand to the Commission to implement a
lawful scheme.
  2. Remaining dedicated transport issues
   The ILECs have raised two additional issues about the
Commission’s treatment of dedicated transport, and the
CLECs yet another. We address the ILECs’ objections
here, and that of the CLECs (which relates to so-called
‘‘entrance facilities’’) below in the portion of the opinion
devoted to their claims.
    a. Route-specific analysis of dedicated transport
   In USTA I we expressed skepticism regarding whether
there could be impairment in markets ‘‘where the element in
question—though not literally ubiquitous—is significantly de-
ployed on a competitive basis,’’ giving as a specific example
interoffice dedicated transport. 290 F.3d at 422. We also
instructed the Commission, as noted above, to apply a ‘‘nu-
anced’’ concept of impairment connected to ‘‘specific markets
or market categories.’’ Id. at 426. Any process of inferring
impairment (or its absence) from levels of deployment de-
pends on a sensible definition of the markets in which deploy-
ment is counted.
   For dedicated transport elements the Commission decided
that the appropriate market was not a geographic market
(e.g., a Metropolitan Statistical Area (‘‘MSA’’), as the ILECs
urged, or general customer class), but rather a specific point-
to-point route. Thus, for example, the fact that dedicated
transport facilities are widely deployed within one MSA does
not, in the Commission’s view, necessarily preclude a finding
of impairment between two specific points within that MSA, if
                              29

deployment has not satisfied the Commission’s competitive
‘‘triggers’’ on that route.
   We do not see how the Commission can simply ignore
facilities deployment along similar routes when assessing
impairment. Suppose points A, B, and C are all in the same
geographic market and are similarly situated with regard to
the ‘‘barriers to entry’’ that the Commission says are control-
ling. See Order ¶ ¶ 84 et seq. Suppose further that multiple
competitors supply DS1 transport between points A and B,
but only the ILEC and one other CLEC have deployed DS1
transport between A and C. The Commission cannot ignore
the A–B facilities deployment when deciding whether CLECs
are impaired with respect to A–C deployment without a good
reason. The Commission does explain why competition on
the A–B route should not be sufficient to establish competi-
tion is possible on the A–C route, Order ¶ 401, but this cannot
explain the Commission’s implicit decision to treat competi-
tion on one route as irrelevant to the existence of impairment
on the other. Nor does the Commission explain whether, and
why, the error costs (both false positives and false negatives)
associated with a route-by-route market definition are likely
to be lower than the error costs associated with alternative
market definitions. While it may be infeasible to define the
barriers to entry in a manageable form, i.e., in such a way
that they may usefully be applied to MSAs (or other plausible
markets) as a whole, the Commission nowhere suggests that
it explored such alternatives, much less found them defective.
    b. Wireless providers’ access to unbundled dedicated
       transport
   In addition to their general challenge to the FCC’s provi-
sional national finding that competitors are impaired without
access to dedicated transport facilities, the ILEC petitioners
also attack the Commission’s conclusion that providers of
wireless service (also known as commercial mobile radio
services, or ‘‘CMRS’’) qualify for unbundled access to these
facilities. According to the ILECs, the Commission not only
failed to conduct the requisite impairment analysis for wire-
less providers, but in fact found that wireless growth has
                               30

been ‘‘remarkable’’: 90% of the U.S. population lives in areas
served by at least three wireless providers, 40% of Americans
and 61% of American households own a wireless phone,
wireless prices have been steadily declining, and 3–5% of
wireless customers use wireless as their only phone, treating
it as a full substitute for traditional land line service. Order
¶ 53. Although the ILECs implicitly concede that wireless
providers would be impaired if they were denied any access
to ILEC dedicated interoffice transport facilities, they point
out that wireless providers have traditionally purchased such
access from ILECs at wholesale rates (a transaction classi-
fied, since adoption of the Act, under § 251(c)(4)). And the
data above clearly show that wireless carriers’ reliance on
special access has not posed a barrier that makes entry
uneconomic. Indeed, the multi-million dollar sums that the
Commission regularly collects in its auctions of such spec-
trum, see, e.g., Annual Report and Analysis of Competitive
Market Conditions With Respect to Commercial Mobile Ser-
vices, Seventh Report, FCC 02–179 (July 3, 2002), Table 1B,
and that firms pay to buy already-issued licenses, see, e.g.,
Annual Report and Analysis of Competitive Market Condi-
tions With Respect to Commercial Mobile Services, Eighth
Report, FCC 03–150 (July 14, 2003), ¶ ¶ 42–44, seem to
indicate that wireless firms currently expect that net reve-
nues will, by a large margin, more than recover all their non-
spectrum costs (including return on capital).
   The FCC and the wireless intervenors do not challenge the
assertion that the current regime has witnessed a rapidly
expanding and prosperous market for wireless service. Rath-
er, they rely on the principle that ‘‘evidence that requesting
carriers are using incumbent LEC tariffed services’’ is not
‘‘relevant to [the] unbundling determination.’’ Order ¶ 102.
  The Commission offers several justifications for its decision
to treat special access availability as irrelevant to the impair-
ment analysis. None withstands scrutiny. First, the Com-
mission suggests that it would be
    inconsistent with the Act if we permitted the incumbent
    LEC to avoid all unbundling merely by providing resold
                              31

    or tariffed services as an alternative. Such an approach
    would give the incumbent LECs unilateral power to
    avoid unbundling at TELRIC rates simply by voluntarily
    making elements available at some higher price.
Order ¶ 102 (footnote omitted). While the possibility to which
the Commission points is undeniable, its implications for the
Act’s implementation aren’t as horrifying as the Commission
seems to think. After all, the purpose of the Act is not to
provide the widest possible unbundling, or to guarantee com-
petitors access to ILEC network elements at the lowest price
that government may lawfully mandate. Rather, its purpose
is to stimulate competition—preferably genuine, facilities-
based competition. Where competitors have access to neces-
sary inputs at rates that allow competition not only to survive
but to flourish, it is hard to see any need for the Commission
to impose the costs of mandatory unbundling.
   We recognize that, given the ILECs’ incentive to set the
tariff price as high as possible and the vagaries of determin-
ing when that price gets so high that the ‘‘impairment’’
threshold has been crossed, a rule that allowed ILECs to
avoid unbundling requirements simply by offering a function
at lower-than-TELRIC rates might raise real administrability
issues. Those complications might in principle support a
blanket rule treating the availability of ILEC tariffed service
as irrelevant to impairment. But the FCC hasn’t defended
its decision in those terms or even tried to explicate these
complications. Moreover, where (as here) market evidence
already demonstrates that existing rates outside the compul-
sion of § 251(c)(3) don’t impede competition, and where (as
here) there is no claim that ILECs would be able drastically
to hike those rates, those possible complications recede even
farther in the background.
   The FCC also suggests that the ILECs’ view would effec-
tively read unbundled access out of the Act. Both the
Commission and the wireless intervenors argue that this
conclusion finds support in Iowa Utilities I, which held that
ILECs could not avoid unbundling requirements by classify-
ing certain features as ‘‘services’’ rather than ‘‘network ele-
                              32

ments.’’ 120 F.3d at 809. There the ILECs had argued that
the legislative history of the Act suggested that functions
offered as services were meant to be governed by the resale
provisions of § 251(c)(4) rather than the unbundling provi-
sions of § 251(c)(3). In rejecting this argument, the Eighth
Circuit said that the provision ‘‘for the resale of telecommuni-
cations services TTT does not establish resale as the exclusive
means through which a competing carrier may gain access to
such services. We agree with the FCC that such an interpre-
tation would allow the incumbent LECs to evade a substantial
portion of their unbundling obligation under subsection
251(c)(3).’’ 120 F.3d at 809. Thus the court found that an
ILEC offer of functions for sale as services did not preclude
classifying these functions as network elements to be unbun-
dled under § 251(c)(3). But that decision in no way supports
a claim that the availability of services for sale under
§ 251(c)(4) is irrelevant to whether there is impairment of the
sort that would require unbundling.
   The Commission next argues that considering special ac-
cess availability in the impairment analysis would ‘‘be con-
trary to the Act’s requirement that unbundled facilities TTT
should be priced at cost-based rates and our determination
that TELRIC is the appropriate methodology for determining
those ratesTTTT’’ Order ¶ 102. This is circular. The ques-
tion is which facilities must be unbundled, or, more specifical-
ly, what the relevant benchmark is for assessing whether
entry is ‘‘impaired’’ if non-ILECs don’t have access to UNEs
(at whatever rate the Commission might choose to prescribe).
   Finally, the FCC suggests that tariffed services ‘‘present
different opportunities and risks for the requesting carrier
than the use of UNEs or non-incumbent LEC alternatives.’’
Order ¶ 102. This may well be true in certain cases, and on
an appropriate record the Commission might find impairment
even when services were available from ILECs outside
§ 251(c)(3). But this possibility doesn’t give the Commission
carte blanche to omit consideration of such alternatives in its
impairment analysis. And it clearly cannot justify a finding
of impairment with respect to wireless, where these different
                               33

‘‘opportunities and risks’’ have obviously not made competi-
tive entry uneconomic.
   We therefore hold that the Commission’s impairment anal-
ysis must consider the availability of tariffed ILEC special
access services when determining whether would-be entrants
are impaired, and vacate ¶ ¶ 102–03 of the Order. This of
course still leaves the Commission free to take into account
such factors as administrability, risk of ILEC abuse, and the
like. What the Commission may not do is compare unbun-
dling only to self-provisioning or third-party provisioning,
arbitrarily excluding alternatives offered by the ILECs.
C.   Network Modification Requirements
   In Iowa Utilities I, the Eighth Circuit struck down an FCC
rule that required ILECs to provide interconnection and
UNEs superior in quality to those that the ILEC provided
for itself. 120 F.3d at 812–13. But the court nonetheless
‘‘endorse[d] the Commission’s statement that ‘the obligations
imposed by sections 251(c)(2) and 251(c)(3) include modifica-
tions to incumbent LEC facilities to the extent necessary to
accommodate interconnection or access to network ele-
ments.’ ’’ Id. at 813 n.33. The line between impermissible
‘‘superior quality’’ requirements and permissible ‘‘modifica-
tion’’ requirements is not always clear.
   In the Order under review, the Commission ‘‘require[d]
incumbent LECs to make routine network modifications to
unbundled transmission facilities used by requesting carriers
where the requested transmission facility has already been
constructed.’’ Order ¶ 632. The Commission elaborated that
‘‘routine network modifications’’ include ‘‘those activities that
incumbent LECs regularly undertake for their own custom-
ers,’’ but do not include ‘‘construction of new wires TTT for a
requesting carrier.’’ Id. Applying this standard, the Com-
mission determined that when ILECs supply high-capacity
loops as unbundled elements, they must ‘‘engage in activities
necessary to activate loops that are not currently activated in
the network.’’ Id. ¶ 633. The FCC gave as examples of such
necessary loop modifications: ‘‘rearrangement or splicing of
cable; adding a doubler or repeater; adding an equipment
                               34

case; adding a smart jack; installing a repeater shelf; adding
a line card; and deploying a new multiplexer or reconfiguring
an existing multiplexer.’’ Id. ¶ 634.
   The ILECs claim that these passages manifest a resurrec-
tion of the unlawful superior quality rules. We disagree.
The FCC has established a clear and reasonable limiting
principle: the distinction between a ‘‘routine modification’’
and a ‘‘superior quality’’ alteration turns on whether the
modification is of the sort that the ILEC routinely performs,
on demand, for its own customers. While there may be
disputes about the application, the principle itself seems
sensible and consistent with the Act as interpreted by the
Eighth Circuit. Indeed, the FCC makes a plausible argu-
ment that requiring ILECs to provide CLECs with whatever
modifications the ILECs would routinely perform for their
own customers is not only allowed by the Act, but is affirma-
tively demanded by § 251(c)(3)’s requirement that access be
‘‘nondiscriminatory.’’ We needn’t reach that claim, however,
since the FCC’s principle is at the very least reasonable and
consistent with Iowa Utilities I.
   The ILECs further object that the Order unlawfully per-
mits states to find that ILECs are not entitled to compensa-
tion for making the requested modifications. We agree with
the FCC that this challenge will not be ripe for judicial
review until a state actually decides how much an ILEC may
charge for a specific network modification.

                    III. CLEC Objections

A. Unbundling of Broadband Loops
   The Commission declined to require ILECs to provide
unbundled access to most of the broadband capabilities of
mass market loops. In particular, it decided (subject to
certain qualifications) not to require unbundling of the broad-
band capabilities of hybrid copper-fiber loops, Order ¶ ¶ 288–
89, or fiber-to-the-home (‘‘FTTH’’) loops, id. ¶ ¶ 273–77, and it
also decided not to require ILECs to unbundle the high-
frequency portion of copper loops, a practice known as ‘‘line
                              35

sharing,’’ id. ¶ ¶ 255–63. The Commission did require ILECs
to unbundle the narrowband portion of hybrid loops, Order
¶ 296, but it permitted ILECs to use a different type of
technology to connect the fiber feeder loop to the copper
distribution portion of the loop than the ILEC itself used, in
light of technological and engineering considerations, Order
¶ 297.
   The CLEC petitioners attack these decisions as inconsis-
tent with the Act. They argue, first, that CLECs are im-
paired without access to the broadband capabilities of loops
and, second, that the Commission is obligated to unbundle
any elements for which impairment has been shown. We
consider these claims with respect to each broadband element
in question. We then consider the CLECs’ claim that their
access to the narrowband portion of hybrid loops is impaired
by the FCC’s decision permitting ILECs to substitute an
allegedly inferior connection technology.
  1. Hybrid loops
   The Commission found some degree of impairment from
competitors’ lack of unbundled access to hybrid loops, Order
¶ 286, but also found that such impairment ‘‘at least partially
diminishes with the increasing deployment of fiber,’’ id., and
that unbundled access to copper subloops ‘‘adequately ad-
dresses’’ that impairment, id. § 291. Nonetheless, evidently
assuming some degree of impairment, it proceeded to invoke
the ‘‘at a minimum’’ language of § 251(d)(2) to weigh other
statutory goals against that effect. Noting the directive in
§ 706(a) of the Act that the Commission should pursue
‘‘methods that remove barriers to infrastructure investment,’’
it found that the costs of unbundling hybrid loops—stifling
investment by both ILECs and CLECs in advanced telecom-
munications infrastructure—outweighed the benefits of re-
moving this barrier to competition. Id. ¶ ¶ 286, 288, 290.
   The CLECs object to this interpretation of the ‘‘at a
minimum’’ clause, arguing that the Act prohibits ‘‘ad hoc’’
balancing of the statute’s pro-competition goals with an alleg-
edly conflicting goal derived from the uncodified § 706. They
interpret the ‘‘at a minimum’’ clause to mean that the FCC
                               36

may order unbundling even in the absence of an impairment
finding if it finds concrete benefits to unbundling that cannot
otherwise be achieved, and that it may refuse to order
unbundling in the face of impairment findings if unbundling
would conflict with some other unambiguous requirement of
the Act, such as funding universal service.
   The CLECs offer two main arguments to support their
interpretation of the ‘‘at a minimum’’ clause. First, they
claim that the Commission’s interpretation contravenes the
Act’s ‘‘stated purpose’’ of promoting competition, CLEC Br.
at 18, a goal that is an ‘‘end in itself.’’ Id. (quoting Verizon,
535 U.S. at 476). But in fact the passage from Verizon on
which the CLECs rely says that eliminating traditional ILEC
monopolies ‘‘was considered both an end in itself and an
important step toward the Act’s other goals,’’ including
‘‘boosting competition in broader markets.’’ 535 U.S. at 476
(emphasis added). Section 706(a) identifies one of the Act’s
goals beyond fostering competition piggy-backed on ILEC
facilities, namely, removing barriers to infrastructure invest-
ment. The Commission thus acted reasonably in its interpre-
tation of the ‘‘at a minimum’’ clause.
   Second, the CLECs contend that failing to impose unbun-
dling in the face of an impairment finding amounts to an
unlawful decision to ‘‘forbear’’ from applying the require-
ments of § 251(c). See §§ 160(a),(d). Here they rely on
Association of Communications Enterprises (‘‘ASCENT’’) v.
FCC, 235 F.3d 662, 665–68 (D.C. Cir. 2001), in which, reject-
ing the Commission’s argument that the exclusion of ILEC
subsidiaries was a reasonable interpretation of the statutory
phrase ‘‘successor or assign’’ in § 251(h)(2)(B)(ii), we held
that the FCC couldn’t exempt an ILEC subsidiary from
§ 251(c)(3) obligations unless it complied with the statutory
forbearance requirements of § 160.
  But § 160, prescribing when the Commission may forbear
from applying statutory requirements, obviously comes into
play only for requirements that exist; it says nothing as to
what the statutory requirements are. Thus ASCENT turned
on our finding that, even under Chevron’s forgiving standard,
                              37

the Commission’s exemption of subsidiaries was inconsistent
with the statute. 235 F.3d at 668.
   As we noted above in Part II.A.3, there are at least two
ways in which the Commission could take into account the
frustration of some of the Act’s goals—such as encouraging
facilities-based competition—that would flow from giving
§ 251(c)(3) unbundling too broad a scope. It could have built
those offsets into its concept of ‘‘impairment’’ by reading that
term narrowly, or it could have embraced a relatively broad
reading of impairment and then considered, element by ele-
ment, how an unbundling order might adversely affect the
Act’s other goals. The CLECs rightly point to USTA I’s
observation that ‘‘impairment’’ was the ‘‘touchstone,’’ 290 F.3d
at 425, but that opinion, far from barring consideration of
factors such as an unbundling order’s impact on investment,
clearly read the Act, as interpreted by the Supreme Court in
AT&T, to mandate exactly such consideration, id. at 427–28.
  We therefore hold that the Commission reasonably inter-
preted § 251(c)(3) to allow it to withhold unbundling orders,
even in the face of some impairment, where such unbundling
would pose excessive impediments to infrastructure invest-
ment.
   But was the Commission’s decision on hybrid loops, on this
record, a legitimate application of that principle? The Com-
mission explained that its decision would stimulate the infra-
structure investment contemplated by § 706 in two ways.
First, limiting access to the fiber portion of the hybrid loops
would give ILECs incentives to deploy fiber (both feeder
fiber and, eventually, FTTH), along with associated next-
generation networking equipment, and to develop new broad-
band offerings for mass market consumers. Because unbun-
dling orders reduce return on investment, such orders would
inhibit ILECs from making risky investments in next-
generation technology. Second, denying CLECs access to
ILEC broadband capabilities will stimulate them to seek
innovative access options for broadband, including self-
deployment of new facilities; unbundling, by contrast, would
                             38

be likely to blunt innovation by locking the CLECs into
technological choices made by the ILECs. Order ¶ ¶ 290,
295.
   The Commission also identified two additional consider-
ations that would mitigate any negative impact on local
competition in broadband. First, CLECs still have unbun-
dled access to other loop alternatives in the ILEC network,
including copper subloops, which allow CLECs to compete in
the broadband market. Order ¶ 291. Second, intermodal
competition in broadband, particularly from cable companies,
means that, even if CLECs proved unable to compete with
ILECs in the broadband market, there would still be vigorous
competition from other sources. Id. ¶ 292.
   The CLEC petitioners reject all these justifications, and
pose a series of objections. First, they argue, the FCC
should redress any investment disincentives for ILEC broad-
band loop investment not by withholding unbundling, but by
modifying the UNE pricing rules. But as we have already
held, § 251(d)(2)’s ‘‘at a minimum’’ clause allows the Commis-
sion to consider the effect on infrastructure investment when
determining what elements must be unbundled. And the fact
that the Commission and the Court have deemed TELRIC a
reasonable methodology for pricing UNEs doesn’t require the
Commission to blind itself to the fact that TELRIC may itself
be imperfect and may be implemented still more imperfectly.
While the Commission might modify its UNE pricing rules to
adequately reduce the negative impacts that it fears, until it
has done so it may reasonably consider real-world risks in
deciding what elements to unbundle.
   Second, the CLECs insist that the record demonstrates
that there is no need for additional incentives for investment
in broadband infrastructure. With respect to broadband
customers served by hybrid loops, ILECs have already exten-
sively deployed fiber feeder loops, and, the CLECs claim,
they would continue to do so even without any incentive from
expected broadband revenues, since the narrowband cost
savings from fiber feeder deployment alone justify ILEC
investment in fiber feeder. Provision of broadband involves
                              39

additional electronic equipment, but the CLECs assert that
the costs involved are negligible compared to the fiber up-
grade, and that in fact most of these additional investments
have already been made. As for alternative means of provid-
ing broadband service, the CLECs characterize the FCC’s
assertion that eliminating unbundled access to hybrid loops
would stimulate ILEC investment in FTTH loops as pure
speculation, inconsistent with record evidence that there is no
consumer demand for services requiring such loops. And
they say that the Commission may not tolerate an impairment
of competition that would benefit consumers of today in order
to create incentives for investment in systems for which there
is no evidence of demand by consumers of tomorrow.
   The Commission says little in the Order or in its brief to
respond the assertion that ILECs would invest in fiber feeder
even without revenue from broadband. Indeed, the Commis-
sion appears to concede that ILECs are already investing
heavily in fiber feeder loops, Order ¶ ¶ 224, 290, and offers no
specific evidence suggesting that unbundling the broadband
capabilities of these loops would have a substantial negative
impact on this investment. (Nor, to be sure, do the CLECs
offer any sort of sophisticated econometric analysis demon-
strating the likely marginal impact on investment.)
   But there are at least three other aspects of the Commis-
sion’s investment incentives argument to which the CLEC
response is either inadequate or non-existent. First, the
Commission suggested that greater incentives may be needed
for ILECs to deploy the additional electronic equipment
needed to provide broadband access over a hybrid loop.
While the CLECs are correct that the Commission concluded
that the deployment of this equipment was far less ‘‘costly,
complex, and risky’’ than deployment of the fiber feeder,
Order ¶ 244, the Commission also noted that this equipment
had not been widely deployed, and suggested that ILECs had
been deterred by the ‘‘regulatory environment.’’ Order ¶ 290
& n.838.
   Second, the Commission noted that deployment of feeder
fiber is the first step toward FTTH, and that limiting access
to ILEC fiber facilities increases incumbents’ incentives to
                               40

develop and deploy FTTH. Order ¶ ¶ 272, 290. Though the
CLECs dismissed this as ‘‘pure speculation,’’ the Commission
relied on submissions in the record that the CLECs have not
directly impeached. Order ¶ 290 n.837. While the CLECs
may be right that the Commission’s judgment entails increas-
ing consumer costs today in order to stimulate technological
innovations for which there is not yet sufficient consumer
demand, there is nothing in the Act barring such trade-offs.
Cf. Consumer Electronics Ass’n v. FCC, 347 F.3d 291, 300–03
(D.C. Cir. 2003) (upholding Commission rule that increased
television prices in order to stimulate transition to digital TV,
for which there is little present demand).
   Third, the Commission rested its judgment not only on the
perceived negative effect of unbundling on ILEC investment
incentives but also on a conclusion that unbundling hybrid
loops would deter CLECs themselves from investing in de-
ploying their own facilities, possibly using different technolo-
gy. Order ¶ ¶ 288, 290. Although the CLECs argue that this
is inconsistent with the Commission’s finding that for fiber
loops, as for copper loops, ‘‘the costs are both fixed and sunk,
and TTT deployment is characterized by scale economies,’’ id.
¶ 240, that very paragraph, after weighing the various advan-
tages of both ILECs and other entrants, concludes that ‘‘the
barriers faced in deploying fiber loops, as opposed to existing
copper loops, may be similar for both incumbent LECs and
competitive LECs.’’ Thus, while declining to unbundle hy-
brid loops might reduce broadband competition, the Commis-
sion reasonably concluded that such a decision might be
effective in stimulating investment in all-fiber loops.
   We thus believe that, even if the CLECs are correct that
unbundling would have no impact on ILEC investment in the
fiber feeder portion of hybrid loops, the other investment
disincentives the Commission identified are sufficient for us
to uphold the reasonableness of the Commission’s determina-
tion. Reading the Order as a whole, we see little sign that
the Commission would have come out otherwise if it had
given the CLEC arguments as much credit as they deserve.
See Indiana Muni. Power Agency v. FERC, 56 F.3d 247, 256
                               41

(D.C. Cir. 1995); Carnegie Natural Gas Co. v. FERC, 968
F.2d 1291, 1294 (D.C. Cir. 1992).
   Nor can we say that the Commission was arbitrary or
capricious in thinking that any damage to broadband competi-
tion from denying unbundled access to the broadband capaci-
ties of hybrid loops is likely to be mitigated by the availability
of loop alternatives or intermodal competition. With regard
to loop alternatives, we agree with the CLECs that these
alternatives are not a perfect substitute for the ILECs’
hybrid loops, but we understand the Commission to say only
that they are a partial substitute; they will mitigate, not
eliminate, CLEC impairment. More important, we agree
with the Commission that robust intermodal competition from
cable providers—the existence of which is supported by very
strong record evidence, including cable’s maintenance of a
broadband market share on the order of 60%, see Order
¶ 292—means that even if all CLECs were driven from the
broadband market, mass market consumers will still have the
benefits of competition between cable providers and ILECs.
Although the CLECs point to evidence that CLEC broad-
band competition has played a role in constraining ILEC
pricing, see Declaration of Robert D. Willig, ¶ ¶ 206–08, Joint
Appendix (‘‘J.A.’’) 885–87, the evidence itself is hardly rigor-
ous and is offset by conflicting material, see Letter of Sus-
anne Guyer, Vice President, Verizon, at 2 (J.A. 2146), itself
not rigorous. Thus the Commission’s consideration of past
pricing effects was not arbitrary, and in any event, as the
discussion above shows, its overall judgment turned on a
range of factors.
  We therefore hold that the Commission’s decision not to
order unbundling of the broadband capacity of hybrid loops
was based on permissible statutory considerations and sup-
ported by substantial evidence.
  Although the Commission refused to unbundle the broad-
band portion of hybrid loops, it required ILECs to unbundle
the narrowband portion, Order ¶ 296, and the CLECs raise
an issue relating to the details of this unbundling. The
Commission said for various technical reasons this would be
                               42

more difficult for hybrid loops that used integrated digital
loop carrier (‘‘IDLC’’) equipment to connect the fiber feeder
portion of the loop to the copper distribution portion than it
would for those that used universal digital loop carrier equip-
ment (‘‘UDLC’’). Order ¶ 297 & n.855.
   The CLECs protest that the record ‘‘unambiguously estab-
lished that UDLC substantially degrades the speed and quali-
ty of dial-up Internet access,’’ CLEC Br. at 30, though they
fail to point us to the portions of the record that supposedly
establish this. The Commission acknowledges that ‘‘UDLC
can, in some circumstances, negatively affect data transmis-
sion speed,’’ FCC Br. 84 n.37, but it disputes the severity of
the impact. Moreover, the Order requires that ILECs ‘‘pres-
ent requesting carriers a technically feasible method of un-
bundled access.’’ Order ¶ 297. Given the CLEC petitioners’
failure to present or highlight evidence that the impact is
severe, or to refute the Commission’s technical analysis, we
have no basis for finding the Commission decision on this
issue arbitrary or capricious.
  2. Fiber-to-the-home (‘‘FTTH’’) loops
   For FTTH loops, the Commission found relatively little
impairment except in a specific, limited domain. Although
FTTH deployment showed some characteristics in common
with copper loops (the costs being ‘‘both fixed and sunk, and
deployment [being] expensive,’’ Order ¶ 274), the Commission
believed that the revenue opportunities of FTTH deployment
were great enough to ‘‘ameliorate many of the entry barri-
ers.’’ Id.; see also id. ¶ 276 (same, with respect to FTTH
parallel to or in replacement of existing copper plant). With
respect to new or so-called ‘‘greenfield’’ FTTH deployments
(as for a new subdivision), it denied unbundling without
qualification. Id. ¶ 275. For the ‘‘largely theoretical’’ scenar-
io in which an ILEC constructed FTTH parallel to or in
replacement of its existing copper plant (‘‘overbuild’’), it de-
clined to find impairment as to broadband services, id. ¶ 276,
but agreed with the CLECs’ concern that an ILEC might
replace and ultimately deny access to the copper loops that
CLECs were using to serve mass market customers, id.
                              43

¶ 277. In the overbuild situations, then, it ruled that the
ILEC must either keep the existing copper loop connected
after deploying FTTH, or else provide CLECs with unbun-
dled access to the narrowband capabilities of the replacement
FTTH loop. Id. ¶ ¶ 277, 281–84.
   Although not contesting the concept that large expected
revenue can offset scale economies, the CLECs do object to
the Commission’s decision that CLECs are not impaired by
lack of unbundled access to FTTH. They argue that the
Commission ignored two critical considerations. First, they
point out that the FCC made a national finding that CLECs
are impaired without unbundled access to enterprise market
high-capacity DS3 loops (which are made from the same fiber
as mass market FTTH loops), finding that ‘‘a single DS3 loop,
generally, can not provide a sufficient revenue opportunity’’ to
overcome the entry barriers to deployment. Order ¶ 320.
This, the CLECs say, contradicts the Commission’s conclu-
sion that ‘‘the substantial revenue opportunities posed by
FTTH deployment help ameliorate many of the entry barri-
ers presented by the costs and scale economies.’’ Id. ¶ 274.
Second, they argue that ILECs enjoy significant ‘‘first mov-
er’’ advantages due to their existing customer base, rights-of-
way, and their existing networks’ substantial excess fiber
capacity (‘‘dark fiber’’) that ILECs can readily use for net-
work extensions.
  While the CLECs’ objections are convincing in many re-
spects, they are ultimately unavailing. Even if the CLECs
are impaired with respect to FTTH deployment (a point we
do not decide), the § 706 considerations that we upheld as
legitimate in the hybrid loop case are enough to justify the
Commission’s decision not to unbundle FTTH. Although the
Commission based its refusal to unbundle on a finding of no
impairment, it made clear that its decision was ‘‘inform[ed]’’
by § 706. Order ¶ 278. In particular, it noted that ‘‘remov-
ing incumbent LEC unbundling obligations on FTTH loops
will promote their deployment of the network infrastructure
necessary to provide broadband services to the mass market.’’
Id. ¶ 278; see also id. ¶ ¶ 272, 290 & n.837.
                               44

   We find that these considerations are sufficient to justify
the Commission’s decision not to require FTTH unbundling,
even if CLECs are to some extent ‘‘impaired’’ in their ability
to enter certain segments of the FTTH broadband market.
This conclusion is buttressed by the evidence in the record
that FTTH deployment is still very limited, Order ¶ 274, that
both the costs and potential benefits of deployment are high,
id., and, at least in some contexts, ILECs and CLECs face
similar entry barriers, Order ¶ ¶ 240, 275 & n.808, ¶ 276. An
unbundling requirement under these circumstances seems
likely to delay infrastructure investment, with CLECs tempt-
ed to wait for ILECs to deploy FTTH and ILECs fearful that
CLEC access would undermine the investments’ potential
return. Absence of unbundling, by contrast, will give all
parties an incentive to take a shot at this potentially lucrative
market.
  3. Line sharing
   In USTA I, 290 F.3d at 428–29, we vacated the Commis-
sion’s decision to provide CLECs with unbundled access to
the high frequency portion of copper loops to provide broad-
band DSL services, primarily because the Commission had
failed to consider the relevance of intermodal competition in
the broadband market. On remand, the Commission decided
to reverse its earlier position and eliminated this unbundling
mandate. The Commission explained its change of heart as
follows.
   First, the FCC rejected its prior finding that lack of
separate access to the high frequency portion would cause
impairment. The earlier impairment finding had been based
on a notion that broadband revenues would not justify the
cost of the whole loop. But now, applying its new decision to
focus on all the potential revenues from the full functionality
of a loop (voice, data, video, and other services), the Commis-
sion believes that these revenues would offset the costs
associated with purchasing the entire loop. Order ¶ 258.
Additionally, the Commission reasons that CLECs interested
only in broadband could obtain broadband frequencies from
other CLECs through line-splitting, in which one CLEC
                              45

provides voice service on the low frequency portion of the
loop and the other provides DSL on the high frequency
portion. Thus, after taking both costs and revenues into
account, the FCC decided that eliminating mandatory line
sharing would not impair CLECs’ ability to provide broad-
band service. Id. ¶ 259.
   The Commission also observed that the difficulties of cost
allocation for different portions of a single loop had led most
states to price the high frequency portion of the loop at
approximately zero. This distorted competitive incentives
since CLECs that purchased only the high frequency portion
had an irrational cost advantage over both ILECs and
CLECs that purchased the whole loop to offer a range of
services. Order ¶ 260. The anomalous price differential also
skewed CLECs’ incentives toward providing only broadband
service instead of bundled voice and DSL, discouraged inno-
vative arrangements between voice CLECs and data CLECs,
and discouraged product differentiation between ILEC and
CLEC offerings. Id. ¶ 261. Thus the FCC found the results
of mandatory line sharing to be contrary to the Act’s goal of
encouraging vigorous competition in all local telecommunica-
tions markets. Id.
   Finally, following our mandate in USTA I, the Commission
noted the substantial intermodal competition from cable com-
panies, which provide nearly 60% of all high-speed lines.
Order ¶ 262 & nn.777–78. Although noting that intermodal
competition was not ‘‘dispositive’’ in the impairment analysis,
the Commission found that it lessened any competitive bene-
fits associated with line sharing. Id. ¶ 263. Taking this into
account, along with the negative impact of unbundling on
competitive incentives, it found that ‘‘the costs of unbundling
the [high frequency portion of the loop] outweigh the bene-
fitsTTTT’’ Id.
   As with FTTH, we find that even if the CLECs are right
that there is some impairment with respect to the elimination
of mandatory line sharing, the Commission reasonably found
that other considerations outweighed any impairment. And
again we note the ambiguous state of the record on the price-
constraining effect of CLEC DSL service. We read the
                               46

Commission as concluding that, at least in the future, line
sharing is not essential to maintain robust competition in this
market, a conclusion based on permissible considerations and
supported by evidence in the record. With respect to the
skewed incentives from zero pricing of the high frequency
portion, it is of course true that alternative cost allocations
could have reduced the skew, but any alternative allocation of
costs would itself have had some inescapable degree of arbi-
trariness.
   Summary. We therefore uphold the Commission’s rules
concerning hybrid loops, FTTH, and line sharing on the
grounds that the decision not to unbundle these elements was
reasonable, even in the face of some CLEC impairment, in
light of evidence that unbundling would skew investment
incentives in undesirable ways and that intermodal competi-
tion from cable ensures the persistence of substantial compe-
tition in broadband.
B.   Exclusion of ‘‘Entrance Facilities’’
   Entrance facilities are dedicated transmission facilities that
connect ILEC and CLEC locations. Before the Order, the
Commission had defined ‘‘dedicated transport facilities’’ as
including entrance facilities. But in the Order it concluded
that this definition was ‘‘overly broad,’’ Order ¶ 365, and
found that ‘‘a more reasonable and narrowly-tailored defini-
tion of the dedicated transport network element includes only
those transmission facilities within an incumbent LEC’s
transport network, that is, the transmission facilities between
incumbent LEC switches,’’ id. ¶ 366. Thus it held, as a
matter of statutory interpretation, that entrance facilities
were not ‘‘network elements’’ subject to the statutory unbun-
dling requirements of § 251(c)(3), id., and accordingly re-
quired no impairment analysis, id. ¶ 367 n.1119. As this is an
issue of statutory construction, we review under the Chevron
standard.
  The CLEC petitioners object that the Commission’s inter-
pretation is flatly inconsistent with the text of the Act. In
particular, the CLECs point out that § 153(29) of the Act
defines ‘‘network element’’ as ‘‘a facility of equipment used in
                              47

the provision of a telecommunications service,’’ and that en-
trance facilities clearly fall within that definition. Also, the
CLEC petitioners continue, the Commission itself, in this
Order, addressed the question whether ‘‘network element’’
included only facilities ‘‘actually used by the incumbent LEC
in the provision of a telecommunications service’’ or also
included facilities ‘‘capable of being used by a requesting
carrier in the provision of a telecommunications service re-
gardless of whether the incumbent LEC is actually using the
network element to provide a telecommunications service,’’
and expressly adopted the latter definition. Order ¶ 59.
    While the Commission’s reasoning appears to have little or
no footing in the statutory definition, we find the record too
obscure to make any final ruling. The CLECs helpfully
provide a diagram of various telecommunications network
facilities, in which entrance facilities appear as completely
stand-alone items linking a CLEC switch with an ILEC
office. CLEC Reply Br. at 3. But no party offers an
explanation as to why ILECs rather than CLECs construct
these facilities. If (as appears) they exist exclusively for the
convenience of the CLECs, it seems anomalous that CLECs
do not themselves provide them, presumably doing so at the
costs associated with ‘‘the most efficient telecommunications
technology currently available,’’ 47 CFR § 51.505(b)(1), i.e.,
the TELRIC standard. The Commission hints at this consid-
eration in observing that its ruling encourages CLECs to
‘‘incorporate those costs within their control into their net-
work deployment strategies.’’ Order ¶ 367. Thus, although
the Commission’s ruling superficially violates the statutory
language, we simply remand the matter for further consider-
ation. If entrance facilities are correctly classified as ‘‘net-
work elements,’’ an analysis of impairment would presumably
follow.
C. Unbundling of Enterprise Switches
  The Commission determined, on a nationwide basis, that
CLECs are not impaired by lack of unbundled access to
switching for the enterprise market at DS1 capacity and
above. Order ¶ ¶ 451–53. Though observing that the record
                               48

showed no impairment on a national basis in the absence of
unbundling, id. ¶ 454, and indeed did ‘‘not contain evidence
identifying any particular markets where competitive carriers
would be impaired,’’ id. ¶ 455, the Commission went on to
note that ‘‘a geographically specific analysis could possibly
demonstrate that competitive carriers are impaired without
access to unbundled incumbent LEC local circuit switching
for DS1 enterprise customers in a particular market,’’ id.
¶ 454. It therefore permitted state commissions to petition
the Commission to waive the ‘‘no impairment’’ finding in
particular markets. Id. ¶ ¶ 455–58. The operative passages
direct the state commissions to ‘‘examine’’ certain issues, and
‘‘consider [certain] evidence,’’ and to make ‘‘finding[s].’’ It is
obscure what weight the Commission intended to give these
findings.
   CLEC petitioners argue that the 90–day time limit on this
petition procedure is arbitrary and capricious, given that in
the mass market switching context the Order gave states nine
months to collect and analyze market data. In what appears
to be a throwaway sentence, the CLECs say the harm
inflicted by this supposed error is ‘‘compounded’’ by the fact
that the 90–day state proceedings are voluntary rather than
mandatory (i.e., at the option of the state commissions), and
that the impairment issue cannot be revisited absent changed
circumstances. Order ¶ 455.
  Since we have invalidated the FCC’s subdelegation scheme
with respect to mass market switches, a challenge based on
the inconsistency between the nine-month period for mass
market determinations and the 90–day period for enterprise
market determinations is moot as a practical matter (though
not in the strict jurisdictional sense). Cf. Belton v. Washing-
ton Metro. Area Transit Auth., 20 F.3d 1197, 1203 (D.C. Cir.
1994). And in any event, we agree with the FCC that the
market data states are to analyze under the enterprise
switching provisions are significantly different from the data
they were supposed to evaluate in the mass market switching
context.
                              49

  Apart from the argument regarding the inconsistency of
time limits, the CLECs’ argument boils down to a claim that
the no impairment finding for enterprise switches (1) is
overbroad; and (2) lacks sufficient ‘‘safety valve’’ procedures
to cure this overbreadth. But the CLECs do not contradict
the Commission’s observation about the absence of evidence
of impairment either nationwide or in specific markets.
Thus, in contrast to the mass market switching context,
where the evidence indicated the presence of many markets
where CLECs suffered no impairment in the absence of
unbundling, here there is no showing of any need for a safety
valve, except insofar as one may infer a need from the
Commission’s creation of one (which may in fact have been
only an excess of caution).
   The CLECs make a rather underdeveloped argument that
the vice of the alleged time-limit anomaly is ‘‘compounded’’ by
the state proceedings being ‘‘voluntary rather than mandato-
ry,’’ and that enterprise switching cannot be re-instated after
the 90–day period without changed circumstances. CLEC
Br. at 40 (citing Order ¶ 455). But these claims seem ancil-
lary to the now-irrelevant time-limit theory, and without a
showing of a need for a safety valve, we see no occasion to
reach them.
  Finally, we note that our holding regarding unlawful sub-
delegation of FCC authority to state commissions does not
control the limited state commission role contemplated in the
portion of the Order dealing with enterprise switching. In
this context, state commissions are allowed merely to petition
the FCC for a waiver of the unbundling order; the FCC has
not granted the states authority to make final decisions on
such matters as the existence of impairment. Because no
party has challenged the limited state role in the enterprise
switching context we have no occasion to rule on whether the
role contemplated for the states here is legally problematic.
D.   Unbundling of Call–Related Databases and Signaling
     Systems
   Call-related databases are used in signaling networks for
billing or for transmission, routing, and other telecommunica-
                              50

tions services. These databases include, for example, ones
that provide name identification for caller ID service and ones
that contain information on calling cards. Order ¶ 549.
When CLECs have unbundled access to ILEC mass market
switches, they also have access to the databases that the
signaling network permits carriers to access. Id. ¶ 551.
Where CLECs provide their own switches, however, they
don’t automatically have access to the needed databases, and
they must either self-provision or purchase databases from
the ILEC or a third party. Id.
   The Commission determined that CLECs are not impaired
without unbundled access to ILEC databases (other than the
911 database) because of the abundance of alternative provid-
ers. Order ¶ ¶ 551–57. The CLECs object, arguing that the
only reason alternatives to ILEC databases exist is that the
Commission had previously required ILECs to provide un-
bundled access to their databases (removing any competitive
incentive for the ILECs to withhold the databases from third
parties). But the CLECs point to nothing in the record
demonstrating that this is so. Even if they did, we doubt that
this alone would support a finding of impairment. As it
stands, CLECs evidently have adequate access to call-related
databases. If subsequent developments alter this situation,
affected parties may petition the Commission to amend its
rule.
E. Unbundling of Shared Transport Facilities
   The FCC found CLECs that lease ILEC mass market
switches are impaired without unbundled access to so-called
‘‘shared transport’’—transmission facilities shared by more
than one carrier, including the ILEC, running between end
office switches, between end office switches and tandem
switches, and between tandem switches within the ILEC’s
network. Order ¶ ¶ 533–34. But the FCC also concluded
that, ‘‘because switching and shared transport are inextrica-
bly linked, if incumbent LECs are no longer obligated to
unbundle switching, they should no longer be obligated to
unbundle shared transport.’’ Id. ¶ 534. In effect, it found
that CLECs are entitled to unbundled shared transport only
                               51

in cases where mass market switching has also been unbun-
dled. Id. The CLECs object to this condition for unbundled
shared transport, saying that they are ‘‘impaired’’ without
access to shared transport between local tandem switches
when they ‘‘transit’’ traffic—that is, when they transport
traffic that originates on their network to other carriers’
networks. The Commission in fact recognized the claim,
saying that it proposed to address the issue in a pending
rulemaking on intercarrier compensation. Id. ¶ 534 n.1640.
  Although the FCC failed to resolve an impairment question
pressed by the CLECs in this Order, the Commission ‘‘need
not address all problems ‘in one fell swoop.’ ’’ U.S. Cellular
Corp. v. FCC, 254 F.3d 78, 86 (D.C. Cir. 2001) (quoting Nat’l
Ass’n of Broadcasters v. FCC, 740 F.2d 1190, 1207 (D.C. Cir.
1984)). The FCC generally has broad discretion to control
the disposition of its caseload, and to defer consideration of
particular issues to future proceedings when it thinks that
doing so would be conducive to the efficient dispatch of
business and the ends of justice. See GTE Service Corp. v.
FCC, 782 F.2d 263, 273–74 (D.C. Cir. 1986) (citing Nader v.
FCC, 520 F.2d 182, 195 (D.C. Cir. 1975) and Cellular Mobile
Sys. of Penn., Inc. v. FCC, 782 F.2d 182, 197 (D.C. Cir. 1985)).
So long as the FCC’s decision to postpone consideration of
the transiting issue doesn’t result in unreasonable delay or
impose substantial hardship on the CLECs—which hasn’t
been shown here—the Commission’s choice to organize its
rulemaking docket in this way is lawful.
F. Section 271 Pricing and Combination Rules
   Section 271 of the Act sets conditions for Bell operating
companies (the ‘‘BOCs’’) to enter the interLATA long dis-
tance market. These conditions include a ‘‘competitive check-
list,’’ § 271(c)(2)(B), specifying fourteen conditions that a
requesting BOC must satisfy before it may provide inter-
LATA service. Checklist item two requires BOCs to provide
‘‘[n]ondiscriminatory access to network elements in accor-
dance with the requirements of sections 251(c)(3) and
251(d)(1),’’ § 271(c)(2)(B)(ii), while checklist items four, five,
six, and ten require the BOC to provide unbundled access to,
                              52

respectively, local loops, local transport, local switching, and
call-related databases, §§ 271(c)(2)(B)(iv)-(vi),(x). The FCC
reasonably concluded that checklist items four, five, six and
ten imposed unbundling requirements for those elements
independent of the unbundling requirements imposed by
§§ 251–52. In other words, even in the absence of impair-
ment, BOCs must unbundle local loops, local transport, local
switching, and call-related databases in order to enter the
interLATA market. Order ¶ ¶ 653–55.
  But the FCC also found that the BOCs’ unbundling obli-
gations under the independent checklist items differed in
some important respects from those under §§ 251–52. Two
such differences are salient here. First, the Commission
determined that TELRIC pricing was not appropriate in the
absence of impairment; for elements for which unbundling
was required only under § 271, the ruling criterion is the
§§ 201–02 standard that rates must not be unjust, unreason-
able, or unreasonably discriminatory. Order ¶ ¶ 656–64.
Second, the Commission decided that, in contrast to ILEC
obligations under § 251, the independent § 271 unbundling
obligations didn’t include a duty to combine network ele-
ments.
   The CLEC petitioners object to both of these differences,
arguing that the independent § 271 unbundling provisions
incorporate all the requirements imposed by §§ 251–52, in-
cluding pricing and combination. Because this is an issue of
statutory construction, we review under Chevron and defer to
the Commission unless Congress has spoken to the precise
question at issue (Chevron step one) or the Commission’s
interpretation is unreasonable (Chevron step two).
   With regard to pricing, the CLECs have no serious argu-
ment that the text of the statute clearly demonstrates that
the § 251 pricing rules apply to unbundling pursuant to § 271
checklist items four, five, six, and ten. The CLECs contend
that checklist item two specifies that the § 252(d)(1) pricing
rules apply to all unbundled ‘‘network elements,’’ but check-
list item two says no such thing. Rather, checklist item two
by its terms requires only ‘‘[n]ondiscriminatory access to
                              53

network elements in accordance with the requirements of
sections 251(c)(3) and 252(d)(1)’’—it says nothing suggesting
that the requirements of those sections also apply to the
independent unbundling requirements imposed by the other
items on the § 271 checklist. The CLECs also claim that it
was unreasonable for the Commission to apply a different
pricing standard under § 271, but we see nothing unreason-
able in the Commission’s decision to confine TELRIC pricing
to instances where it has found impairment. See generally
Order ¶ ¶ 657–64.
   As to combinations, the CLECs argue that the Supreme
Court decisions in AT&T and Verizon establish that the
nondiscrimination provision in § 251(n)(3), not its reference to
‘‘combin[ation],’’ provides the basis for the rules that ILECs
may not separate already-combined network elements before
turning them over to competitors, and that ILECs must
combine unbundled network elements when requested to do
so by CLECs. See CLEC Br. at 42 (citing AT&T, 525 U.S.
at 394, and Verizon, 535 U.S. at 537).
  CLEC reliance on AT&T and Verizon is misplaced for two
reasons. First, as we’ve already held with regard to pricing,
§ 271 checklist items four, five, six, and ten do not incorpo-
rate any of the specific requirements of § 251(c)(3), including
the nondiscrimination prohibition specific to that section.
Second, neither AT&T nor Verizon holds that the § 251(c)(3)
nondiscrimination requirement mandates the combination
rules the FCC promulgated under that section; rather, those
cases found the nondiscrimination language in § 251(c)(3)
ambiguous and deferred to the agency’s reading of it. AT&T,
525 U.S. at 394–95; Verizon, 535 U.S. at 531–38. These
holdings don’t necessarily establish that a different rule would
be unreasonable. Cf. Rust v. Sullivan, 500 U.S. 173, 186–87
(1991).
  We agree with the Commission that none of the require-
ments of § 251(c)(3) applies to items four, five, six and ten on
the § 271 competitive checklist. Of course, the independent
unbundling under § 271 is presumably governed by the gen-
eral nondiscrimination requirement of § 202. But as the only
                             54

challenge the CLECs have presented to the FCC’s § 271
combination rules is grounded in an erroneous claim of a
cross-application of § 251, we do not pass on whether the
§ 271 combination rules satisfy the § 202 nondiscrimination
requirement.

 IV. Unbundling of Enhanced Extended Links (‘‘EELs’’)
   Enhanced extended links (‘‘EELs’’) are high-capacity
loop/transport combinations that run directly between an end
user (usually a large business customer) and an IXC/CLEC
office. Supplemental Order Clarification, 15 FCC Rcd 9587,
9593 (2000), ¶ 10 n.36. EELs can be used to provide local
exchange services, but they can also be used to originate and
terminate long-distance calls. IXC providers have tradition-
ally purchased these services from ILECs for long distance
purposes as a special access service, i.e., under the ILEC’s
tariff rather than at TELRIC rates.
    In its first Order implementing the 1996 Act, the FCC did
not impose any limits on the telecommunications services that
a CLEC could provide with the UNEs to which it was
entitled access. Order ¶ 134 & n.446 (citing Third Report and
Order, 15 FCC Rcd at 3911–12 ¶ 484 and First Report and
Order, 11 FCC Rcd at 15671–72 ¶ 356). But in 1999 the FCC
modified this principle with respect to EELs, and issued (as
an interim measure) a supplemental order that limited access
to EELs as UNEs to those CLECs that would use unbundled
EELs to provide ‘‘a significant amount of local exchange
service.’’ Supplemental Order, 15 FCC Rcd 1760, 1760 ¶ 2.
The FCC subsequently clarified and refined this principle,
adopting three ‘‘safe harbors’’ that required CLECs to certify
sufficient local traffic percentages in order to qualify for
unbundled access to EELs, Supplemental Order Clarifica-
tion, 15 FCC Rcd 9587, 9598–60 ¶ 22, and restricting ‘‘com-
mingling’’ by CLECs of EELs and tariffed special access
services used for interoffice transmission, id. at 9602 ¶ 28.
We upheld these rules—which the FCC characterized as
‘‘interim restrictions’’—in Competitive Telecommunications
Ass’n v. FCC, 309 F.3d 8 (D.C. Cir. 2002) (‘‘CompTel’’).
                               55

   In the Order under review, the Commission revised its
approach to EELs. First, the Commission generalized the
principle underlying its earlier EELs rulings by interpreting
the unbundling obligations of § 251(d)(3) to apply only to
‘‘qualifying services,’’ defined as ‘‘those telecommunications
services that competitors provide in direct competition with
the incumbent LECs’ core services.’’ Order ¶ 139. The FCC
also decided that, once a CLEC obtained access to a UNE for
a qualifying service, the CLEC could use that UNE to
provide additional non-qualifying services. Order ¶ 143. Un-
der these principles, CLECs are entitled to unbundled EELs
only if they use these facilities for local exchange service
(which counts as a qualifying service), but not for use exclu-
sively for non-qualifying long distance service. Order ¶ ¶ 591,
595.
   The Commission also changed its strategy for enforcing
this basic principle and for preventing ‘‘gaming’’ by carriers
that, while not bona fide providers of local service, might seek
to take advantage of the low (TELRIC) price of unbundled
EELs. It abandoned the ‘‘safe harbor’’ approach, agreeing
with the CLECs that this regime had proved intrusive,
unworkable, and susceptible to abuse by ILECs. Order ¶ 596
& n.1831, ¶ 614. It also lifted the prohibition on ‘‘comming-
ling.’’ Id. ¶ ¶ 579–84. In place of the old restrictions, the
Commission established new ‘‘eligibility criteria’’ as prerequi-
sites for a competitor to enjoy the access entitlement of a
bona fide provider of a qualifying service. Id. ¶ ¶ 591–611.
Each applicant would have to show, first, that it had a state
certification to provide local voice service and, second, that at
least one local number was assigned to each circuit to be
acquired as a UNE. Id. ¶ ¶ 597, 601–02. In addition, the
Commission imposed a variety of technical requirements
aimed at preventing firms from gaming the system. Id.
¶ ¶ 597, 603–11.
   While the Commission admitted that none of the anti-
gaming requirements by itself would prevent gaming, it con-
cluded that they were ‘‘collectively sufficient to restrict the
availability of these UNE combinations to legitimate provid-
ers of local voice service.’’ Order ¶ 600 (emphasis in original).
                               56

It justified this conclusion on the logic that ‘‘the burdens and
inefficiencies for a provider to meet these criteria for non-
qualifying service would deter a carrier of non-qualifying
service from re-designing its operations to subvert our rules.’’
Id. The Commission also allowed CLECs that met the
eligibility criteria, but that currently purchased EELs from
ILECs as special access services at wholesale rates (i.e., not
TELRIC), to ‘‘convert’’ these wholesale services to UNEs.
Order ¶ 586. The CLECs object both to the concept of
distinguishing between qualifying and non-qualifying service,
and to the eligibility criteria used to implement the distinc-
tion.
A.   The Qualifying Service/Non–Qualifying Service Distinc-
     tion
   The CLECs object to the FCC’s decision that long distance
is not a ‘‘qualifying service,’’ claiming that this conclusion is
foreclosed by §§ 251(c)(3) and 251(d)(2)(B) of the Act. Long
distance services, including the origination and termination
functions performed by EELs, are clearly ‘‘telecommunica-
tions services,’’ and § 251(d)(2) directs the Commission to
provide unbundled access to elements where the lack of such
an element ‘‘would impair the ability of the telecommunica-
tions carrier seeking access to provide the services it seeks to
offer.’’ (The Commission assumes, as we believe it must, that
the reference to ‘‘services’’ in § 251(d)(2) is meant to refer to
the ‘‘telecommunications services’’ covered by § 251(c)(3).
Order ¶ 138). The CLECs therefore argue that the FCC
cannot arbitrarily exclude them from this impairment analy-
sis.
  The Commission asserts that ‘‘section 251(d)(2)’s reference
to the ‘services that [the carrier] seeks to offer’ is ambiguous
as to the question of which services we should analyze in the
context of our impairment analysis.’’ Order ¶ 137 (alteration
in original). Having thus ‘‘conclude[d] that the language of
section 251(d)(2) is ambiguous concerning the scope of the
impairment inquiry,’’ Order ¶ 138, the FCC looked to the
history and purposes of the Act and concluded that ‘‘a reason-
able interpretation of the statute’’ would restrict the impair-
                              57

ment inquiry to those services offered in direct competition
with ILEC core services such as local voice and data services,
id. ¶ 139.
   In CompTel we agreed with the Commission that
§ 251(d)(2) was ambiguous on the question whether the FCC
could make impairment decisions on a service-by-service ba-
sis. 309 F.3d at 12. That is, we considered a situation where
an element could be used to provide services A and B, and a
carrier requested unbundling for both. We held that the
Commission acted reasonably in disaggregating the impair-
ment issue, and in ordering unbundling only with respect to
the service for which it found impairment. 309 F.3d at 12–13
(service-by-service impairment analysis permissible); 14 (im-
pairment finding made by FCC as to local service but not as
to long distance).
  Here the Commission asserts an entirely different sort of
statutory ambiguity, namely, whether long distance services
are ‘‘services’’ at all and therefore require the Commission, on
request, to perform an impairment analysis. We are not
persuaded by the Commission’s claim that the ambiguity
regarding the permissibility of service-by-service impairment
determinations extends to whether long distance services (or
other telecommunications services that do not compete direct-
ly with ‘‘core’’ ILEC services) are ‘‘services’’ within the
meaning of § 251(d)(2) in the first place. Even under the
deferential Chevron standard of review, an agency cannot,
absent strong structural or contextual evidence, exclude from
coverage certain items that clearly fall within the plain mean-
ing of a statutory term. The argument that long distance
services are not ‘‘telecommunications services’’ has no sup-
port.
  The Commission does suggest that the ‘‘impairment’’ re-
quirement is closely linked to natural monopoly conditions
that prevail only with respect to the core ILEC services that
the Commission defined as ‘‘qualifying services.’’ FCC Br. at
77 (citing USTA I, 290 F.3d at 427). But that argument
addresses impairment, not the definition of ‘‘services.’’ We
therefore remand those sections of the Order (¶ ¶ 132–53)
                              58

resting the exclusion of ‘‘non-qualifying’’ services on the Com-
mission’s reading of the phrase ‘‘telecommunications services’’
in § 251(d)(2)(B).
   This does not, of course, necessarily invalidate the Commis-
sion’s effort to prevent the use of EELs for long distance
service. The CLECs have pointed to no evidence suggesting
that they are impaired with respect to the provision of long
distance services, and in CompTel we emphatically held that
the Act did not bar a service-by-service analysis of impair-
ment. 309 F.3d at 12–14. The CLECs do not deny that they
have been able to purchase use of EELs as ‘‘special access.’’
As we noted with respect to wireless carriers’ UNE demands,
competitors cannot generally be said to be impaired by
having to purchase special access services from ILECs, rath-
er than leasing the necessary facilities at UNE rates, where
robust competition in the relevant markets belies any sugges-
tion that the lack of unbundling makes entry uneconomic.
  On remand, therefore, the Commission will presumably
turn to the issue of impairment. Because it may well find
none with reference to long distance service, we now turn to
the eligibility criteria.
B. The EEL Eligibility Criteria
   Both the CLECs and the ILECs object to the FCC’s
eligibility criteria. The CLECs say they are too stringent
and are over-inclusive insofar as they preclude access to
EELs used to provide services for which CLECs are im-
paired. The ILECs claim they are too lax and are under-
inclusive insofar as they fail to prevent CLECs from using
unbundled EELs exclusively for long distance services.
   We think that the Commission’s eligibility criteria, though
imperfect, reflect a reasonable effort to establish an admin-
istrable system that balances two legitimate but conflicting
goals: the prevention of ‘‘gaming’’ by CLECs seeking to offer
services for which they are not impaired, and the preserva-
tion of unbundled access for CLECs seeking to offer services
for which they are impaired. We accord considerable defer-
ence to such administrative determinations, see WorldCom,
                              59

Inc. v. FCC, 238 F.3d 449, 459 (D.C. Cir. 2001); Home Box
Office, Inc. v. FCC, 567 F.2d 9, 60 (D.C. Cir. 1977), and find
that the proxies the FCC used, though imperfect (as the
Commission itself candidly admits, Order ¶ 600), are neither
inconsistent with the Act nor arbitrary and capricious. The
Commission also satisfactorily explained both the problems
with the regime previously in place (which the ILECs
thought should be retained), Order ¶ 614, and with the
CLECs’ proposed alternatives, id. ¶ ¶ 615–19.
   The ILECs make an independent attack on the Commis-
sion’s decision to allow ‘‘conversions’’ of wholesale special
access purchases to UNEs. As we discussed in the section
on wireless carriers, the presence of robust competition in a
market where CLECs use critical ILEC facilities by purchas-
ing special access at wholesale rates, i.e., under § 251(c)(4),
precludes a finding that the CLECs are ‘‘impaired’’ by lack of
access to the element under § 251(c)(3). We realize that this
might create anomalies, as CLECs hitherto relying on special
access might be barred from access to EELs as unbundled
elements, while a similarly situated CLEC that had just
entered the market would not be barred. On the other hand,
if history showed that lack of access to EELs had not
impaired CLECs in the past, that would be evidence that
similarly situated firms would be equally unimpaired going
forward. Because we have already determined that we must
remand to the Commission, given the invalidity of the line it
drew between qualifying and non-qualifying services, the
Commission can consider and resolve any potential anomaly
on remand.

                     V. Miscellaneous
   There remain two loose ends, attacks on the Order by the
National Association of State Utility Consumers Advocates
(‘‘NASUCA’’) and by a group of state petitioners. We find
that NASUCA lacks standing and that the state petitioners’
claim is unripe.
A. NASUCA’s Standing
   NASUCA is a non-profit association of offices, each of
which has been designated by its respective state govern-
                              60

ments to represent the interests of utility consumers in
regulatory and judicial proceedings. We agree with the
Commission that NASUCA has failed to establish standing
pursuant to the requirements of Sierra Club v. EPA, 292
F.3d 895, 899–901 (D.C. Cir. 2002), though for different
reasons than those advanced by the Commission.
   Under Sierra Club, ‘‘a petitioner whose standing is not self-
evident should establish its standing by the submission of its
arguments and any affidavits or other evidence appurtenant
thereto at the first appropriate point in the review proceed-
ing.’’ 292 F.3d at 900. A petitioner’s standing is self-evident
only if ‘‘no evidence outside the administrative record is
necessary for the court to be sure of it.’’ Id. at 900. Con-
trary to the Commission’s assertions, we believe that no
evidence outside the administrative record is necessary to
explain how (on NASUCA’s view of the merits) the Order
injures the consumers that NASUCA claims to represent.
See NASUCA ex parte letter (Feb. 13, 2002) at 2–3. On the
theories advanced by NASUCA, consumers would enjoy a
superior price/quality trade-off in telephone service if the
Commission accepted its analysis. But it is not at all self-
evident from the record that NASUCA meets the association-
al standing criteria established in Hunt v. Washington State
Apple Advertising Commission, 432 U.S. 333, 344–45 (1977),
for entities that are not voluntary membership organizations.
See also Fund Democracy, LLC v. SEC, 278 F.3d 21, 25–26
(D.C. Cir. 2002); Am. Legal Found. v. FCC, 808 F.2d 84, 89–
90 (D.C. Cir. 1987). Although utility consumer interests are
clearly affected by the Order, nothing in the administrative
record or NASUCA’s opening brief establishes that NASUCA
is qualified to represent those interests in federal court. We
therefore conclude that NASUCA lacks standing and do not
reach the merits of its claims.
B. Ripeness of the State Preemption Claims
  The state petitioners argue that the Order improperly
preempts state unbundling regulations that exist independent
of the Commission’s federal unbundling regulations enacted
pursuant to § 251. Specifically, the state petitioners point to
                              61

¶ 195 of the Order, which allows ‘‘[p]arties that believe that a
particular state unbundling obligation is inconsistent with the
limits of section 251(d)(3)(B) and (C)’’ to seek a declaratory
ruling from the Commission, and further predicts that state
unbundling requirements for elements that the FCC has
determined need not be unbundled under § 251(d)(2) are
‘‘unlikely’’ to be found consistent with the Act.
   The state petitioners’ challenge to the preemptive scope of
the Order is not ripe. The general prediction voiced in ¶ 195
does not constitute final agency action, as the Commission has
not taken any view on any attempted state unbundling order.
Nor does the states’ claim present a purely legal question, as
they acknowledge that Commission regulations will lawfully
preempt in some circumstances. See Alascom, Inc. v. FCC,
727 F.2d 1212, 1218–20 (D.C. Cir. 1984); see also Time
Warner Entertainment Co. v. FCC, 56 F.3d 151, 193–96 (D.C.
Cir. 1995). Besides, the state petitioners have not—and
probably could not—identify any substantial hardship that
they would suffer by deferring judicial review of the preemp-
tion issues until the FCC actually issues a ruling that a
specific state unbundling requirement is preempted. We
therefore hold the challenge unripe.

                       VI. Conclusion
  To summarize: We vacate the Commission’s subdelegation
to state commissions of decision-making authority over im-
pairment determinations, which in the context of this Order
applies to the subdelegation scheme established for mass
market switching and certain dedicated transport elements
(DS1, DS3, and dark fiber). We also vacate and remand the
Commission’s nationwide impairment determinations with re-
spect to these elements.
  We vacate the Commission’s decision not to take into
account availability of tariffed special access services when
conducting the impairment analysis, and we therefore vacate
and remand the decision that wireless carriers are impaired
without unbundled access to ILEC dedicated transport.
                               62

   We vacate the Commission’s distinction between qualifying
and non-qualifying services, and remand (but do not vacate)
the decision that competing carriers are not entitled to un-
bundled EELs for provision of long distance exchange ser-
vice.
  We remand the Commission’s decision to exclude entrance
facilities from the definition of ‘‘network element’’ for further
development of the record to allow proper judicial review.
  The petitions for review are otherwise denied, except for
NASUCA’s petition, which is dismissed for want of standing,
and the state commissions’ (and that part of the ILEC
petitions relating to compensation for modification of ele-
ments), which are dismissed as unripe. The ILECs’ manda-
mus petitions are dismissed as moot.
   As to the portions of the Order that we vacate, we tempo-
rarily stay the vacatur (i.e., delay issue of the mandate) until
no later than the later of (1) the denial of any petition for
rehearing or rehearing en banc or (2) 60 days from today’s
date. This deadline is appropriate in light of the Commis-
sion’s failure, after eight years, to develop lawful unbundling
rules, and its apparent unwillingness to adhere to prior
judicial rulings.
                                                     So ordered.