Document:

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THIS WARRANT HAS NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS
AMENDED, AND MAY NOT BE TRANSFERRED IN THE ABSENCE OF REGISTRATION UNDER SAID
ACT UNLESS ADVANCED SWITCHING COMMUNICATIONS, INC. RECEIVES A SATISFACTORY
OPINION OF COUNSEL THAT SUCH REGISTRATION IS NOT REQUIRED (WHICH REQUIREMENT MAY
BE WAIVED BY ADVANCED SWITCHING COMMUNICATIONS, INC. IN ITS SOLE DISCRETION).

       AMENDED AND RESTATED WARRANT TO PURCHASE COMMON STOCK

       FOR VALUE RECEIVED, ADVANCED SWITCHING COMMUNICATIONS, INC., a Delaware
corporation (the "Company"), hereby grants to ICI Capital LLC, a Delaware
limited liability company (the "Holder"), a wholly-owned subsidiary of
Intermedia Communications Inc., a Delaware corporation (the "Parent" and,
together with any of its subsidiaries, the "Parent Group"), the right to
purchase from the Company at any time and from time to time after the date
hereof one hundred twenty-five thousand (125,000) shares (the "Warrant Shares")
of fully paid and nonassessable Common Stock, par value $.005 per share, of the
Company (the "Common Stock"), at the price specified in Section 2 hereof, as may
be adjusted from time to time pursuant to Section 7 hereof (the "Warrant
Price"), subject to the provisions and upon the terms and conditions hereinafter
set forth. This Warrant amends and restates in its entirety that certain Warrant
granted by the Company to the Holder, dated as of March 10, 2000.

       1.     Term of Warrant.

              The purchase right represented by this Warrant is vested as the
date hereof and shall become exercisable, in whole or in part, in accordance
with Section 3. Any portion of this Warrant that becomes exercisable shall
remain exercisable for a period of twenty-four (24) months at which time such
portion of the Warrant shall expire (each, an "Expiration Date"); provided,
however, that if an underwritten public offering of the Company's equity
securities for aggregate gross proceeds to the Company of at least $20 million
(a "Qualified Public Offering") has not been consummated prior to March 10,
2001, the Expiration Date for any portion of the Warrant that has become
exercisable prior to such date shall be extended until the second anniversary of
the consummation of a Qualified Public Offering.

       2.     Warrant Price.

              The Warrant Price is $15.00 per share, subject to adjustment from
time to time pursuant to the provisions of Section 7 hereof.

       3.     Exercisability.

              (a) This Warrant will become exercisable as follows (each event, a
"Milestone"):

                     (i) as to the first 30,000 Warrant Shares (the "First
                     Tranche"), the Warrant will become immediately exercisable
                     if Parent Group has fully paid for

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                     Three Million U.S. Dollars ($3,000,000) of the Company's
                     products by the later of (such later date, the "First Order
                     By Date") (i) March 10, 2001 or (ii) six (6) months after a
                     Qualified Public Offering; provided that if Parent Group
                     has, in good faith, ordered Three Million U.S. Dollars
                     ($3,000,000) of the Company's products prior to the First
                     Order By Date, but has not yet paid for such order, this
                     Warrant will become immediately exercisable as to the First
                     Tranche upon payment of at least Three Million U.S. Dollars
                     ($3,000,000) toward the purchase price of any order;

                     (ii) as to the next 15,000 Warrant Shares (the "Second
                     Tranche"), the Warrant will become immediately exercisable
                     if Parent Group has fully paid for an additional Two
                     Million U.S. Dollars ($2,000,000) of the Company's products
                     by March 10, 2003 (the "Second Order By Date"); provided
                     that if Parent Group has, in good faith, ordered Two
                     Million U.S. Dollars ($2,000,000) of the Company's products
                     prior to the Second Order By Date, but has not yet paid for
                     such order, this Warrant will become immediately
                     exercisable as to the Second Tranche upon payment of at
                     least Two Million U.S. Dollars ($2,000,000) toward the
                     purchase price of any order not counted toward the reaching
                     of any other Milestone;

                     (iii) as to the next 15,000 Warrant Shares (the "Third
                     Tranche"), the Warrant will become immediately exercisable
                     if Parent Group has fully paid for an additional Two
                     Million U.S. Dollars ($2,000,000) of the Company's products
                     by the Second Order By Date; provided that if Parent Group
                     has, in good faith, ordered Two Million U.S. Dollars
                     ($2,000,000) of the Company's products prior to the Second
                     Order By Date, but has not yet paid for such order, this
                     Warrant will become immediately exercisable as to the Third
                     Tranche upon payment of at least Two Million U.S. Dollars
                     ($2,000,000) toward the purchase price of any order not
                     counted toward the reaching of any other Milestone;

                     (iv) as to the next 20,000 Warrant Shares (the "Fourth
                     Tranche"), the Warrant will become immediately exercisable
                     if Parent Group has fully paid for an additional Three
                     Million U.S. Dollars ($3,000,000) of the Company's products
                     by the Second Order By Date; provided that if Parent Group
                     has, in good faith, ordered Three Million U.S. Dollars
                     ($3,000,000) of the Company's products prior to the Second
                     Order By Date, but has not yet paid for such order, this
                     Warrant will become immediately exercisable as to the
                     Fourth Tranche upon payment of at least Three Million U.S.
                     Dollars ($3,000,000) toward the purchase price of any order
                     not counted toward the reaching of any other Milestone;

                     (v) as to the next 25,000 Warrant Shares (the "Fifth
                     Tranche"), the Warrant will become immediately exercisable
                     if Parent Group has fully paid for an additional Five
                     Million U.S. Dollars ($5,000,000) of the

                                      -2-

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                     Company's products by March 10, 2004 (the "Third Order By
                     Date"); provided that if Parent Group has, in good faith,
                     ordered Five Million U.S. Dollars ($5,000,000) of the
                     Company's products prior to the Third Order By Date, but
                     has not yet paid for such order, this Warrant will become
                     immediately exercisable as to the Fifth Tranche upon
                     payment of at least Five Million U.S. Dollars ($5,000,000)
                     toward the purchase price of any order not counted toward
                     the reaching of any other Milestone;

                     (vi) as to the next 20,000 Warrant Shares (the "Sixth
                     Tranche"), the Warrant will become immediately exercisable
                     if Parent Group has fully paid for an additional Five
                     Million U.S. Dollars ($5,000,000) of the Company's products
                     by the Third Order By Date; provided that if Parent Group
                     has, in good faith, ordered Five Million U.S. Dollars
                     ($5,000,000) of the Company's products prior to the Third
                     Order By Date, but has not yet paid for such order, this
                     Warrant will become immediately exercisable as to the Sixth
                     Tranche upon payment of at least Five Million U.S. Dollars
                     ($5,000,000) toward the purchase price of any order not
                     counted toward the reaching of any other Milestone.

              (b) Notwithstanding any of the provisions of Section 3(a), the
entire Warrant shall become immediately exercisable with respect to all of the
Warrant Shares on the seventh anniversary of the date hereof.

       4.     Method of Exercise; Payment.

              (a) Subject to Sections 1 and 3 hereof, the purchase right
represented by this Warrant may be exercised by the Holder, in whole or in part,
by the surrender of this Warrant (with the notice of exercise form attached
hereto as Exhibit 1 duly executed) at the principal office of the Company, and
by the payment to the Company, by certified check or wire transfer, of an amount
equal to the then applicable Warrant Price per share multiplied by the number of
shares then being purchased. The Holder may exercise the purchase right
represented by this Warrant without the payment of cash (hereinafter a "Cashless
Exercise"), by reducing the number of shares of Common Stock obtainable upon its
exercise and payment in cash so as to yield a number of shares of Common Stock
issuable upon the Cashless Exercise of this Warrant equal to the product of (a)
the number of shares of Common Stock issuable as of the date of exercise (the
"Exercise Date") upon the exercise of such Warrant (if payment of the Warrant
Price were being made in cash) and (b) the Cashless Exercise Ratio. As used
herein, the "Cashless Exercise Ratio" shall mean a fraction, the numerator of
which is the excess of the Fair Market Value (as defined below) per share of the
Common Stock on the Exercise Date over the Warrant Price per share of Common
Stock as of the Exercise Date and the denominator of which is the Fair Market
Value per share of the Common Stock on the Exercise Date. Upon surrender of this
Warrant, the number of shares of Common Stock deliverable upon a Cashless
Exercise shall be equal to the number of shares of Common Stock issuable upon
the exercise of the Warrant that the Holder specifies are to be exercised
pursuant to a Cashless Exercise multiplied by the Cashless Exercise Ratio.

                                      -3-

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              Upon the surrender of this Warrant and the payment of the per
share Exercise Price or upon a Cashless Exercise, the Company shall, as promptly
as practicable, execute and deliver, in accordance with such notice, a
certificate or certificates representing the aggregate number of shares of
Common Stock specified in such notice. At the time of delivery of this Warrant,
appropriate notation will be made designating the number of shares purchased and
the Warrant shall then be returned to the Holder if it has been exercised in
part. The Company shall pay all expenses, taxes and other charges payable in
connection with the preparation, issuance and delivery of stock certificates,
except that, in case stock certificates shall be registered in a name or names
other than the name of the Holder, funds sufficient to pay all transfer taxes
which shall be payable upon the issuance of stock certificates shall be paid by
the Holder hereof at the time of delivery of the notice of exercise or promptly
upon receipt of a written request of the Company for payment.

              The Company shall maintain at its principal office a Warrant
Register for registration of Warrant certificates and transfers thereof. The
Company shall initially register the outstanding Warrants in the name of the
Holder. The Company may deem and treat the registered holder(s) of the Warrant
certificates as the absolute owner(s) thereof and of the Warrants represented
thereby (notwithstanding any notation of ownership or other writing on the
Warrant certificates made by any person) and as the Holder hereunder for the
purpose of any exercise thereof or any distribution to the Holder(s), and for
all other purposes, and the Company shall not be effected by notice to the
contrary.

       (b) As used in this Agreement, the "Fair Market Value" of the Common
Stock shall mean:

                     (i) if the Common Stock is publicly traded, the average,
                     for the 15 previous trading days, of:

                            (A) the closing prices of the Common Stock on the
                            national securities exchange(s) on which the Common
                            Stock may at the time be listed, or

                            (B) if there have been no sales on such exchange(s)
                            on any such trading day, the average of the highest
                            bid and lowest asked prices on such exchange(s) at
                            the end of such day, or

                            (C) if on any such trading day the Common Stock is
                            not so listed, the average of the representative bid
                            and asked prices quoted on the Nasdaq National
                            Market ("Nasdaq") as of 4:00 p.m., New York City
                            time, on such day, or

                            (D) if on any such trading day the Common Stock is
                            not quoted on Nasdaq, the average of the highest bid
                            and lowest asked price on such day in the domestic
                            over-the-counter market as reported by

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<PAGE>   5

                            the National Quotation Bureau, Incorporated, or any
                            similar for such date; and

                     (ii) if the Common Stock is not publicly traded, the value
                     of the Common Stock, as determined in good faith by the
                     Board of Directors of the Company.

       5.     Stock Fully Paid; Reservation of Shares.

                  All Common Stock which may be issued upon the exercise of the
rights represented by this Warrant will, upon issuance, be fully paid and
nonassessable, and free from all liens and charges with respect to the issue
thereof. During the period within which the rights represented by this Warrant
may be exercised, the Company will at all times have authorized, and reserved
for the purpose of the issuance upon exercise of the purchase rights evidenced
by this Warrant, a sufficient number of shares of its Common Stock to provide
for the exercise of the rights represented by this Warrant.

       6.     Special Agreements of the Company.

              The Company covenants and agrees that if the Common Stock is
listed on a stock exchange or quoted on the Nasdaq National Market, the Company
will use its reasonable best efforts to procure, at its sole expense, the
listing of all Warrant Shares (subject to issuance or notice of issuance) on all
stock exchanges on which the Common Stock is then listed, or the quotation of
the Warrant Shares on the Nasdaq National Market, as the case may be, and
maintain the listing or quotation of such shares and other securities after
issuance.

       7.     Adjustment of Warrant Price and Number of Shares.

              The kind of securities purchasable upon the exercise of this
Warrant, the Warrant Price and the number of shares purchasable upon exercise of
this Warrant shall be subject to adjustment from time to time upon the
occurrence of certain events as follows:

              (a) Reclassification, Consolidation or Merger. In case of any (i)
reclassification or change of outstanding securities of the class issuable upon
exercise of this Warrant (other than a change in par value, or from par value to
no par value, or from no par value to par value, or as a result of a subdivision
or combination), (ii) merger or consolidation of the Company with or into
another corporation in which the Company is not the surviving entity, or a
merger or other transaction in which the Company is the surviving entity but the
shares of the Company's capital stock outstanding immediately prior to the
merger or other transaction are converted by virtue of the merger or other
transaction into other property, whether in the form of securities, cash, or
otherwise, or (iii) sale or transfer of the Company's properties and assets as,
or substantially as, an entirety to any other person, then, as a part of such
reorganization, merger, consolidation, sale or transfer, the Company, or such
successor corporation, as the case may be, shall execute a new Warrant,
providing that the Holder shall have the right to exercise such new

                                      -5-

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Warrant and procure upon such exercise, in lieu of each share of Common Stock
theretofore issuable upon exercise of this Warrant, the kind and amount of
shares of stock, other securities, money and property receivable upon such
reclassification, change, consolidation or merger by a holder of one share of
Common Stock. Such new Warrant shall provide for adjustments which shall be as
nearly equivalent as may be practicable to the adjustments provided for in this
Section 7 The provisions of Section 7(a) shall similarly apply to successive
reclassifications, changes, consolidations, mergers and transfers.

              (b) Subdivision or Combination of Shares. If the Company at any
time while this Warrant remains outstanding and unexpired shall subdivide or
combine its Common Stock, the Warrant Price shall be proportionately decreased
in the case of a subdivision or increased in the case of a combination.

              (c) Stock Dividends. If the Company at any time while this Warrant
is outstanding and unexpired shall pay a dividend with respect to Common Stock
payable in, or make any other distribution with respect to Common Stock (except
any distribution specifically provided for in the foregoing Section 7(a) or
Section 7(b)) of Common Stock, then the Warrant Price shall be adjusted, from
and after the date of determination of stockholders entitled to receive such
dividend or distribution, to that price determined by multiplying the Warrant
Price in effect immediately prior to such date of determination by a fraction
(a) the numerator of which shall be the total number of shares of Common Stock
outstanding immediately prior to such dividend or distribution and (b) the
denominator of which shall be the total number of shares of Common Stock
outstanding immediately after such dividend or distribution.

              (d) Other Distributions. If the Company at any time while this
Warrant is outstanding and unexpired shall distribute to holders of its Common
Stock any of its assets (including cash) or securities (other than pursuant to
Sections 7(a), (b) or (c)), then the Holder shall, upon exercise of the Warrant,
be entitled to a proportionate share of any such distribution (without interest
thereon) as though it was the holder of the number of shares of Common Stock
into which the Warrant was exercisable as of the record date fixed for the
determination of the holders of Common Stock entitled to receive such
distribution.

              (e) Certain Events. If any event occurs of the type contemplated
by the provisions of this Section 7 but not expressly provided for by such
provisions (including, without limitation, the granting of stock appreciation
rights, phantom stock rights or other rights with equity features), then the
Company's Board of Directors shall make an appropriate adjustment in the Warrant
Price so as to protect the rights of the Company and the Holder of this Warrant.

              (f) Adjustment of Number of Shares. Upon each adjustment in the
Warrant Price pursuant to any of Sections 7(a), (b), (c) or (e) hereof, the
number of shares of Common Stock purchasable hereunder shall be adjusted, to the
nearest whole share, to the product obtained by multiplying the number of shares
purchasable immediately prior to such adjustment in the Warrant Price by a
fraction, the numerator of which shall be the Warrant Price immediately prior to
such adjustment and the denominator of which shall be the Warrant Price
immediately thereafter.

                                      -6-

<PAGE>   7

              (g) Minimum Adjustment. The adjustments required by the preceding
sections of this Section 7 shall be made whenever and as often as any specified
event requiring an adjustment shall occur, except that no adjustment of the
Warrant Price or the number of shares of Common Stock issuable upon exercise of
this Warrant that would otherwise be required shall be made unless and until
such adjustment either by itself or with other adjustments not previously made
increases or decreases by at least 1% the Warrant Price or the number of shares
of Common Stock issuable upon exercise of this Warrant immediately prior to the
making of such adjustment. Any adjustment representing a change of less than
such minimum amount shall be carried forward and made as soon as such
adjustment, together with other adjustments required by this Section 7 and not
previously made, would result in a minimum adjustment. For the purpose of any
adjustment, any specified event shall be deemed to have occurred at the close of
business on the date of its occurrence. In computing adjustments under this
Section 7, fractional interests in Common Stock shall be taken into account to
the nearest one-hundredth of a share.

       8.     Notice of Adjustments.

              Whenever any Warrant Price shall be adjusted pursuant to Section 7
hereof, the Company shall prepare promptly a certificate signed by its chief
financial officer setting forth, in reasonable detail, the event requiring the
adjustment, the amount of the adjustment, the method by which such adjustment
was calculated, the Warrant Price or Prices after giving effect to such
adjustment and the number of shares then purchasable upon exercise of this
Warrant, and shall cause copies of such certificate to be mailed (by first class
mail, postage prepaid) to the Holder at the address specified in Section 12(f)
hereof, or at such other address as may be provided to this Company in writing
by the Holder.

       9.     Fractional Shares.

              The Company shall not issue any fractional shares of Common Stock
in connection with any exercise hereunder, and shall make a cash payment
therefor upon the basis of the Warrant Price then in effect in lieu of any
fractional shares issuable pursuant to any exercise hereunder.

       10.    Compliance with Securities Act.

              The Holder, by acceptance of this Warrant, represents, warrants,
covenants and agrees that:

              (a) This Warrant and the shares of Common Stock to be issued upon
exercise hereof are being acquired for investment and that it will not offer,
sell or otherwise dispose of this Warrant or any shares of Common Stock to be
issued upon exercise hereof except under circumstances which will not result in
a violation of the Securities Act of 1933, as amended (the "Act").

                                      -7-

<PAGE>   8

              (b) Holder is an "accredited investor" as defined in Rule 501(a)
under the Act.

              (c) Upon exercise of this Warrant, the Holder hereof shall, if
requested by the Company, confirm in writing, in a form satisfactory to the
Company, that the shares of Common Stock so purchased are being acquired for
investment and not with a view toward distribution or resale.

              (d) All shares of Common Stock issued upon exercise of this
Warrant (unless registered under the Act) shall be stamped or imprinted with a
legend substantially in the following form:

              "THIS SECURITY HAS NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF
              1933, AS AMENDED. NO SALE OR DISPOSITION MAY BE EFFECTED WITHOUT
              AN EFFECTIVE REGISTRATION STATEMENT RELATED THERETO OR AN OPINION
              OF COUNSEL FOR THE HOLDER, SATISFACTORY TO THE COMPANY, THAT SUCH
              REGISTRATION IS NOT REQUIRED UNDER THE SECURITIES ACT OF 1933, AS
              AMENDED (WHICH REQUIREMENT MAY BE WAIVED BY ADVANCED SWITCHING
              COMMUNICATIONS, INC. IN ITS SOLE DISCRETION)."

       11.    Transfer.

              Prior to a Qualified Public Offering, no Holder of this Warrant
shall sell, assign, transfer, pledge, hypothecate, mortgage, encumber or dispose
of all or any of this Warrant or the shares of Common Stock or securities
issuable upon exercise hereof.

       12.    Miscellaneous.

              (a) No Rights as Stockholder. No Holder of this Warrant shall be
entitled to vote or receive dividends (except pursuant to Section 7(d) hereof)
or be deemed the holder of Common Stock or any other securities of the Company
which may at any time be issuable on the exercise hereof for any purpose, nor
shall anything contained herein be construed to confer upon the Holder, as such,
any of the rights of a stockholder of the Company or any right to vote for the
election of directors or upon any matter submitted to stockholders at any
meeting thereof, or to give or withhold consent to any corporate action (whether
upon any recapitalization, issuance of stock, reclassification of stock, change
of par value or change of stock to no par value, consolidation, merger,
conveyance or otherwise) or to receive notice of meetings, or to receive
dividends or subscription rights or otherwise until the Warrant shall have been
exercised and the shares purchasable upon the exercise hereof shall have become
deliverable, as provided herein.

              (b) Replacement. On receipt of evidence reasonably satisfactory to
the Company of the loss, theft, destruction or mutilation of this Warrant and,
in the case of loss, theft or destruction, on delivery of an indemnity agreement
or bond reasonably satisfactory in form and amount to the Company or, in the
case of mutilation, on surrender and cancellation of this

                                      -8-

<PAGE>   9

Warrant, the Company, at its expense, will execute and deliver, in lieu of this
Warrant, a new Warrant of like tenor.

              (c) Payment of Taxes. The Company will pay all documentary stamp
taxes attributable to the initial issuance of the Warrants and of the Warrant
Shares upon the exercise of Warrants; provided, however, that the Company shall
not be required to pay any tax or taxes which may be payable in respect of any
transfer involved in the issuance of any Warrant certificates or any
certificates for Warrant Shares in a name other than that of the registered
holder of such Warrant certificate, and the Company shall not be required to
issue or deliver such Warrant certificates unless or until the person or persons
requesting the issuance thereof shall have paid to the Company the amount of
such tax or shall have established to the reasonable satisfaction of the Company
that such tax has been paid.

              (d) Statement on Warrants. Irrespective of any adjustment in the
number or kind of shares issuable upon the exercise of the Warrants or the
Warrant Price, Warrant certificates theretofore or thereafter issued may
continue to express the same number and kind of shares and the same Warrant
Price as are stated in the Warrant certificates initially issuable pursuant to
this Agreement.

              (e) Notice of Capital Changes. In case:

                  (i) the Company shall declare any dividend or distribution
payable to the holders of its Common Stock;

                  (ii) there shall be any capital reorganization or
reclassification of the capital stock of the Company, or consolidation or merger
of the Company with, or sale of all or substantially all of its assets to,
another corporation or business organization; or

                  (iii) there shall be a voluntary or involuntary dissolution;
liquidation or winding up of the Company;

then the Company shall give the Holder written notice, in the manner set forth
in Section 11(f) below, of the date on which a record shall be taken for such
dividend or distribution or for determining stockholders entitled to vote upon
such reorganization, reclassification, consolidation, merger, sale, dissolution,
liquidation or winding up and of the date when any such transaction shall take
place, as the case may be.

              (f) Notice.

                  (i) Any notice or communication shall be in writing and
delivered in person or mailed by first-class mail addressed as follows:

                      if to the Company:

                      Advanced Switching Communications, Inc.

                                      -9-

<PAGE>   10

                      8330 Boone Boulevard
                      Fifth Floor
                      Vienna, VA  22182
                      Attention:  Secretary

                      if to the Holder:

                      The Holder's address as it appears on the records of the
Company.

                  (ii) The Company or the Holder by notice to the other may
designate additional or different addresses for subsequent notices or
communications.

                  (iii) Failure to mail a notice or communication to a Holder or
any defect in it shall not affect its sufficiency with respect to other Holders
(if any). If a notice or communication is mailed in the manner provided above,
it is duly given, whether or not the addressee receives it.

              (g) Amendment. This Warrant may be amended by the Company without
the consent of any Holder for the purpose of curing any ambiguity, or of curing,
correcting or supplementing any defective provision contained herein or adding
or changing any other provisions with respect to matters or questions arising
under this Warrant as the Company may deem necessary or desirable (including,
without limitation, any addition or modification to provide for compliance with
the transfer restrictions set forth herein); provided, however, that such action
shall not adversely affect the rights of any Holder. Any amendment or supplement
to this Warrant that has an adverse effect on the interests of the Holder shall
require the written consent of the Holder of this Warrant (or, after the date
specified by Section 11 hereof, the Holders of a majority of the then
outstanding Warrants). The consent of each Holder affected shall be required for
any amendment pursuant to which the Warrant Price would be increased, the number
of shares of Common Stock issuable upon exercise of this Warrant would be
decreased (other than pursuant to adjustments provided herein) or the
antidilution provisions in Section 7 are altered in a manner which adversely
affects the Holder.

              (h) No Impairment. The Company will not, by amendment of its
Certificate of Incorporation or through any reorganization, transfer of assets,
consolidation, merger, dissolution, issue or sale of securities or any other
voluntary action, avoid or seek to avoid the observance or performance of any of
the terms to be observed or performed hereunder by the Company, but will at all
times in good faith assist in the carrying out of all the provisions in this
Warrant and use its commercially reasonable best efforts to take all such action
as may be necessary or appropriate in order to protect the rights of the
registered holder(s) of the Warrant against impairment.

              (i) Successors. All agreements of the Company in this Warrant
shall bind its successors. All agreements of the Holder in this Agreement shall
bind its successors and the Holder is expressly authorized to transfer and
assign this Warrant to Parent or any wholly-owned direct or indirect subsidiary
of Parent.

                                      -10-

<PAGE>   11

              (j) Governing Law. This Warrant shall be governed by and construed
under the laws of the State of Delaware without regard to its conflict of laws
or principles.

         This Warrant is executed as of this 30th day of June, 2000.

                                       ADVANCED SWITCHING COMMUNICATIONS, INC.

                                       By:   /s/ HARRY J. D'ANDREA
                                             -----------------------------
                                       Name:     Harry J. D'Andrea
                                             -----------------------------
                                       Title:    Chief Financial Officer
                                             -----------------------------

                                      -11-

<PAGE>   12

                                    EXHIBIT 1
                               NOTICE OF EXERCISE

TO:      ADVANCED SWITCHING COMMUNICATIONS, INC.

         1. The undersigned hereby elects to purchase _______ shares of the
Common Stock of Advanced Switching Communications, Inc. pursuant to the terms of
the attached warrant, and tenders herewith payment of the purchase price of such
shares in full or elects a Cashless Exercise.

         2. Please issue a certificate or certificates representing said shares
of Common Stock in the name of the undersigned or in such other name as is
specified below:

                                         -----------------------------
                                              (Name)

                                         -----------------------------

                                         -----------------------------
                                              (Address)

         3. The undersigned represents that the aforesaid shares of Common Stock
are being acquired for the account of the undersigned for investment and not
with a view to, or for resale in connection with, the distribution thereof and
that the undersigned has no present intention of distribution or reselling such
shares.

                                     ---------------------------------
                                     By:
                                        ------------------------------

                                     Name:
                                          ----------------------------

                                     Title:
                                           ---------------------------

                                      -12-<PAGE>   1
                                 FORM OF WARRANT

                                                                    CONFIDENTIAL

THIS WARRANT HAS NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS
AMENDED, AND MAY NOT BE TRANSFERRED IN THE ABSENCE OF REGISTRATION UNDER SAID
ACT UNLESS ADVANCED SWITCHING COMMUNICATIONS, INC. RECEIVES A SATISFACTORY
OPINION OF COUNSEL THAT SUCH REGISTRATION IS NOT REQUIRED.

                        WARRANT TO PURCHASE COMMON STOCK

       FOR VALUE RECEIVED, ADVANCED SWITCHING COMMUNICATIONS, INC., a Delaware
corporation (the "Company"), hereby grants to Broadband Office, Inc., a Delaware
corporation (the "Holder"), the right to purchase from the Company at any time
Two Hundred and Twenty-Two Thousand (222,000) shares of fully paid and
nonassessable Common Stock, par value $.005 of the Company (the "Common Stock"),
at the price specified in Section 2 hereof, as may be adjusted from time to time
pursuant to Section 5 hereof (the "Warrant Price"), subject to the provisions
and upon the terms and conditions hereinafter set forth.

       1.     Term of Warrant.

              The purchase right represented by this Warrant is exercisable, in
whole or in part, at any time after the date hereof and prior to the
thirty-sixth (36th) month anniversary of the date hereof (the "Expiration
Date").

       2.     Warrant Price. The Warrant Price is $8.00 per share, subject to
adjustment from time to time pursuant to Section 5 hereof.

       3.     Method of Exercise; Payment.

       Subject to Section 1 hereof, the purchase right represented by this
Warrant may be exercised by the Holder, in whole or in part, by the surrender of
this Warrant (with the notice of exercise form attached hereto as Exhibit 1 duly
executed) at the principal office of the Company, and by the payment to the
Company, by certified check or wire transfer, of an amount equal to the then
applicable Warrant Price per share multiplied by the number of shares then being
purchased. The Holder may exercise the purchase right represented by this
Warrant without the payment of cash (hereinafter a "Cashless Exercise"), by
reducing the number of shares of Common Stock obtainable upon its exercise and
payment in cash so as to yield a number of shares of Common Stock upon the
exercise of this Warrant equal to the product of (a) the number of shares of
Common Stock issuable as of the date of exercise (the "Exercise Date")

<PAGE>   2

upon the exercise of such Warrant (if payment of the Warrant Price were being
made in cash) and (b) the Cashless Exercise Ratio. As used herein, the "Cashless
Exercise Ratio" shall mean a fraction, the numerator of which is the excess of
the Fair Market Value per share of the Common Stock on the Exercise Date over
the Warrant Price as of the Exercise Date and the denominator of which is the
Fair Market Value per share of the Common Stock on the Exercise Date. Upon
surrender of this Warrant, the number of shares of Common Stock deliverable upon
a Cashless Exercise shall be equal to the number of shares of Common Stock
issuable upon the exercise of the Warrant that the Holder specifies are to be
exercised pursuant to a Cashless Exercise multiplied by the Cashless Exercise
Ratio.

       Upon the surrender of this Warrant and the payment of the per share
Exercise Price or upon a Cashless Exercise, the Company shall, as promptly as
practicable and in any event within fourteen (14) days thereafter, execute and
deliver, in accordance with such notice, a certificate or certificates
representing the aggregate number of shares of Common Stock specified in such
notice. At the time of delivery of this Warrant, appropriate notation will be
made designating the number of shares purchased and the Warrant shall then be
returned to the Holder if it has been exercised in part. The Company shall pay
all expenses, taxes and other charges payable in connection with the
preparation, issuance and delivery of stock certificates, except that, in case
stock certificates shall be registered in a name or names other than the name of
the Holder, funds sufficient to pay all transfer taxes which shall be payable
upon the issuance of stock certificates shall be paid by the Holder hereof at
the time of delivery of the notice of exercise or promptly upon receipt of a
written request of the Company for payment.

       4.     Stock Fully Paid; Reservation of Shares.

              All Common Stock which may be issued upon the exercise of the
rights represented by this Warrant will, upon issuance, be fully paid and
nonassessable, and free from all liens and charges with respect to the issue
thereof. During the period within which the rights represented by this Warrant
may be exercised, the Company will at all times have authorized, and reserved
for the purpose of the issuance upon exercise of the purchase rights evidenced
by this Warrant, a sufficient number of shares of its Common Stock to provide
for the exercise of the rights represented by this Warrant.

       5.     Adjustment of Warrant Price and Number of Shares.

              The kind of securities purchasable upon the exercise of this
Warrant, the Warrant Price and the number of shares purchasable upon exercise of
this Warrant shall be subject to adjustment from time to time upon the
occurrence of certain events as follows:

              (a)    Reclassification, Consolidation or Merger. In case of any
(i) reclassification or change of outstanding securities of the class issuable
upon exercise of this Warrant (other than a change in par value, or from par
value to no par value, or from no par value to par value, or as a result of a
subdivision or combination), (ii) merger or consolidation of the Company with or
into another corporation in which the Company is not the surviving entity, or a
reverse triangular merger in which the Company is the surviving entity but the
shares of the

                                      -2-
<PAGE>   3

Company's capital stock outstanding immediately prior to the merger are
converted by virtue of the merger into other property, whether in the form of
securities, cash, or otherwise, or (iii) sale or transfer of the Company's
properties and assets as, or substantially as, an entirety to any other person,
then, as a part of such reorganization, merger, consolidation, sale or transfer,
the Company, or such successor corporation, as the case may be, shall execute a
new Warrant, providing that the Holder shall have the right to exercise such new
Warrant and procure upon such exercise, in lieu of each share of Common Stock
theretofore issuable upon exercise of this Warrant, the kind and amount of
shares of stock, other securities, money and property receivable upon such
reclassification, change, consolidation or merger by a holder of one share of
Common Stock. Such new Warrant shall provide for adjustments which shall be as
nearly equivalent as may be practicable to the adjustments provided for in this
Section 5. The provisions of Section 5(a) shall similarly apply to successive
reclassifications, changes, consolidations, mergers and transfers.

              (b)    Subdivision or Combination of Shares. If the Company at any
time while this Warrant remains outstanding and unexpired shall subdivide or
combine its Common Stock, the Warrant Price shall be proportionately decreased
in the case of a subdivision or increased in the case of a combination.

              (c)    Stock Dividends. If the Company at any time while this
Warrant is outstanding and unexpired shall pay a dividend with respect to Common
Stock payable in, or make any other distribution with respect to Common Stock
(except any distribution specifically provided for in the foregoing Section 5(a)
or Section 5(b)) of Common Stock, then the Warrant Price shall be adjusted, from
and after the date of determination of stockholders entitled to receive such
dividend or distribution, to that price determined by multiplying the Warrant
Price in effect immediately prior to such date of determination by a fraction
(a) the numerator of which shall be the total number of shares of Common Stock
outstanding immediately prior to such dividend or distribution and (b) the
denominator of which shall be the total number of shares of Common Stock
outstanding immediately after such dividend or distribution.

              (d)    Other Distributions. If the Company at any time while this
Warrant is outstanding and unexpired shall distribute to holders of its Common
Stock any of its assets (including cash), then the Holder shall, upon exercise
of the Warrant, be entitled to a proportionate share of any such distribution
(without interest thereon) as though it was the holder of the number of shares
of Common Stock into which the Warrant was exercisable as of the record date
fixed for the determination of the holders of Common Stock entitled to receive
such distribution.

              (e)    Certain Events. If any event occurs of the type
contemplated by the provisions of this Section 5 but not expressly provided for
by such provisions (including, without limitation, the granting of stock
appreciation rights, phantom stock rights or other rights with equity features),
then the Company's Board of Directors shall make an appropriate adjustment in
the Warrant Price so as to protect the rights of the Company and the Holder of
this Warrant.

                                      -3-
<PAGE>   4

              (f)    Adjustment of Number of Shares. Upon each adjustment in the
Warrant Price pursuant to any of Sections 5(a), (b) or (c) hereof, the number of
shares of Common Stock purchasable hereunder shall be adjusted, to the nearest
whole share, to the product obtained by multiplying the number of shares
purchasable immediately prior to such adjustment in the Warrant Price by a
fraction, the numerator of which shall be the Warrant Price immediately prior to
such adjustment and the denominator of which shall be the Warrant Price
immediately thereafter.

              (g)    Minimum Adjustment. The adjustments required by the
preceding sections of this Section 5 shall be made whenever and as often as any
specified event requiring an adjustment shall occur, except that no adjustment
of the Warrant Price or the number of shares of Common Stock issuable upon
exercise of this Warrant that would otherwise be required shall be made unless
and until such adjustment either by itself or with other adjustments not
previously made increases or decreases by at least 1% the Warrant Price or the
number of shares of Common Stock issuable upon exercise of this Warrant
immediately prior to the making of such adjustment. Any adjustment representing
a change of less than such minimum amount shall be carried forward and made as
soon as such adjustment, together with other adjustments required by this
Section 5 and not previously made, would result in a minimum adjustment. For the
purpose of any adjustment, any specified event shall be deemed to have occurred
at the close of business on the date of its occurrence. In computing adjustments
under this Section 5, fractional interests in Common Stock shall be taken into
account to the nearest one-hundredth of a share.

       6.     Notice of Adjustments.

              Whenever any Warrant Price shall be adjusted pursuant to Section 5
hereof, the Company shall prepare promptly a certificate signed by its chief
financial officer setting forth, in reasonable detail, the event requiring the
adjustment, the amount of the adjustment, the method by which such adjustment
was calculated, the Warrant Price or Prices after giving effect to such
adjustment and the number of shares then purchasable upon exercise of this
Warrant, and shall cause copies of such certificate to be mailed (by first class
mail, postage prepaid) to the Holder at the address specified in Section 10(d)
hereof, or at such other address as may be provided to this Company in writing
by the Holder.

       7.     Fractional Shares.

              The Company shall not be required to issue any fractional shares
of Common Stock in connection with any exercise hereunder, and in the event the
Company elects not to issue such fractional shares in lieu of such fractional
shares the Company shall make a cash payment therefor upon the basis of the
Warrant Price then in effect.

       8.     Compliance with Securities Act.

              The Holder, by acceptance of this Warrant, represents, warrants,
covenants and agrees that:

                                      -4-
<PAGE>   5

              (a)    This Warrant and the shares of Common Stock to be issued
upon exercise hereof are being acquired for investment and that it will not
offer, sell or otherwise dispose of this Warrant or any shares of Common Stock
to be issued upon exercise hereof except under circumstances which will not
result in a violation of the Securities Act of 1933, as amended (the "Act").

              (b)    Holder is "accredited investor" as defined in Rule 501(a)
under the Act.

              (c)    Upon exercise of this Warrant, the Holder hereof shall, if
requested by the Company, confirm in writing, in a form satisfactory to the
Company, that the shares of Common Stock so purchased are being acquired for
investment and not with a view toward distribution or resale.

              (d)    All shares of Common Stock issued upon exercise of this
Warrant (unless registered under the Act) shall be stamped or imprinted with a
legend substantially in the following form:

              "THIS SECURITY HAS NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF
              1933, AS AMENDED. NO SALE OR DISPOSITION MAY BE EFFECTED WITHOUT
              AN EFFECTIVE REGISTRATION STATEMENT RELATED THERETO OR AN OPINION
              OF COUNSEL FOR THE HOLDER, SATISFACTORY TO THE COMPANY, THAT SUCH
              REGISTRATION IS NOT REQUIRED UNDER THE SECURITIES ACT OF 1933, AS
              AMENDED."

       9.     Transfer.

              Prior to an underwritten public offering of Common Stock for
aggregate gross proceeds to the Company of at least $25 million, no Holder of
this Warrant shall sell, assign, transfer, pledge, hypothecate, mortgage,
encumber or dispose of all or any of this Warrant or the shares of Common Stock
or securities issuable upon exercise hereof.

       10.    Miscellaneous.

              (a)    No Rights as Stockholder. No Holder of this Warrant shall
be entitled to vote or receive dividends or be deemed the holder of Common Stock
or any other securities of the Company which may at any time be issuable on the
exercise hereof for any purpose, nor shall anything contained herein be
construed to confer upon the Holder, as such, any of the rights of a stockholder
of the Company or any right to vote for the election of directors or upon any
matter submitted to stockholders at any meeting thereof, or to give or withhold
consent to any corporate action (whether upon any recapitalization, issuance of
stock, reclassification of stock, change of par value or change of stock to no
par value, consolidation, merger, conveyance or otherwise) or to receive notice
of meetings, or to receive dividends or subscription rights or otherwise until
the

                                      -5-
<PAGE>   6

Warrant shall have been exercised and the shares purchasable upon the exercise
hereof shall have become deliverable, as provided herein.

              (b)    Replacement. On receipt of evidence reasonably satisfactory
to the Company of the loss, theft, destruction or mutilation of this Warrant
and, in the case of loss, theft or destruction, on delivery of an indemnity
agreement or bond reasonably satisfactory in form and amount to the Company or,
in the case of mutilation, on surrender and cancellation of this Warrant, the
Company, at its expense, will execute and deliver, in lieu of this Warrant, a
new Warrant of like tenor.

              (c)    Notice of Capital Changes. In case:

                     (i)    the Company shall declare any dividend or
distribution payable to the holders of its Common Stock;

                     (ii)   there shall be any capital reorganization or
reclassification of the capital stock of the Company, or consolidation or merger
of the Company with, or sale of all or substantially all of its assets to,
another corporation or business organization; or

                     (iii)  there shall be a voluntary or involuntary
dissolution; liquidation or winding up of the Company;

then the Company shall give the Holder written notice, in the manner set forth
in Section 10(d) below, of the date on which a record shall be taken for such
dividend or distribution or for determining stockholders entitled to vote upon
such reorganization, reclassification, consolidation, merger, sale, dissolution,
liquidation or winding up and of the date when any such transaction shall take
place, as the case may be.

              (d)    Notice.

                     (i)    Any notice or communication shall be in writing and
delivered in person or mailed by first-class mail addressed as follows:

                            if to the Company:

                            Advanced Switching Communications, Inc.
                            8330 Boone Boulevard
                            Fifth Floor
                            Vienna, VA  22182
                            Attention:  Secretary

                            if to the Holder:

                            The Holder's address as it appears on the records of
                            the Company.

                                      -6-
<PAGE>   7

                     (ii)   The Company or the Holder by notice to the other may
designate additional or different addresses for subsequent notices or
communications.

                     (iii)  Failure to mail a notice or communication to a
Holder or any defect in it shall not affect its sufficiency with respect to
other Holders (if any). If a notice or communication is mailed in the manner
provided above, it is duly given, whether or not the addressee receives it.

              (e)    Amendment. This Warrant may be amended by the Company
without the consent of any Holder for the purpose of curing any ambiguity, or of
curing, correcting or supplementing any defective provision contained herein or
adding or changing any other provisions with respect to matters or questions
arising under this Warrant as the Company may deem necessary or desirable
(including, without limitation, any addition or modification to provide for
compliance with the transfer restrictions set forth herein); provided, however,
that such action shall not adversely affect the rights of any Holder. Any
amendment or supplement to this Warrant that has an adverse effect on the
interests of the Holder shall require the written consent of the Holder of this
Warrant (or, after the date specified by Section 9 hereof, the Holders of a
majority of the then outstanding Warrants). The consent of each Holder affected
shall be required for any amendment pursuant to which the Warrant Price would be
increased, the number of shares of Common Stock issuable upon exercise of this
Warrant would be decreased (other than pursuant to adjustments provided herein)
or the antidilution provisions in Section 5 are altered in a manner which
adversely affects the Holder.

              (f)    No Impairment. The Company will not, by amendment of its
Certificate of Incorporation or through any reorganization, transfer of assets,
consolidation, merger, dissolution, issue or sale of securities or any other
voluntary action, avoid or seek to avoid the observance or performance of any of
the terms to be observed or performed hereunder by the Company, but will at all
times in good faith assist in the carrying out of all the provisions in this
Warrant.

              (g)    Successors. All agreements of the Company in this Warrant
shall bind its successors. All agreements of the Holder in this Agreement shall
bind its successors.

              (h)    Governing Law. This Warrant shall be governed by and
construed under the laws of the State of Delaware without regard to its conflict
of laws or principles.

                                      -7-
<PAGE>   8

       This Warrant is executed as of this 21st day of June, 2000.

                         ADVANCED SWITCHING COMMUNICATIONS, INC.

                         By:    /s/ [SIG]
                               --------------------------------
                         Name:  HARRY J. D'ANDREA
                               --------------------------------
                         Title: CFO
                               --------------------------------

                                      -8-
<PAGE>   9

                                    EXHIBIT 1
                               NOTICE OF EXERCISE

TO:    ADVANCED SWITCHING COMMUNICATIONS, INC.

       1.     The undersigned hereby elects to purchase _______ shares of the
Common Stock of Advanced Switching Communications, Inc. pursuant to the terms of
the attached warrant, and tenders herewith payment of the purchase price of such
shares in full.

       2.     Please issue a certificate or certificates representing said
shares of Common Stock in the name of the undersigned or in such other name as
is specified below:

                                   ------------------------------------------
                                       (Name)

                                   ------------------------------------------

                                   ------------------------------------------
                                       (Address)

       3.     The undersigned represents that the aforesaid shares of Common
Stock are being acquired for the account of the undersigned for investment and
not with a view to, or for resale in connection with, the distribution thereof
and that the undersigned has no present intention of distribution or reselling
such shares.

                                   ------------------------------------------

                                   By:
                                         ------------------------------------
                                   Name:
                                         ------------------------------------
                                   Title:
                                         ------------------------------------

                                      -9-

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