Document:

<PAGE>

NEXTLINK                                                         EXHIBIT 10.16

<TABLE>
<S>                                                                         <C>
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SERVICE ORDER AND AGREEMENT
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Salesperson:            Margle/Grantham        CC Representative:                           Date:      6/25/99
                  -----------------------------                  -------------------------        ------------
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Type of Service
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Local:       Long Distance:        800:         Calling Card        Other:   X    Promo:         Centrex          (see attached)
       ------               ------      ------               ------        -----         ------          --------
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Address Information
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Customer Name:          Fastnet                                    Physical Address:              Same as billing
               -----------------------------------------------                      -----------------------------------------------
Billing Address:             Two Courtney Place
               -----------------------------------------------                      -----------------------------------------------
                     Suite 130
         -----------------------------------------------------                      -----------------------------------------------
                     3864 Courtney Street                          City:                   ST:           Zip:
         -----------------------------------------------------           -----------------     ---------      ---------------------
City:         Bethlehem      ST:    PA       Zip:   18017          Install Contact:          Phil Weller
     ---------------------      ---------        -------------                     ------------------------------------------------
Customer Contact:          Phil Weller                             Date to be Contacted:
                 ---------------------------------------------                          -------------------------------------------
Title:                                Phone:   610-266-6700        Title:                               Phone:
       ----------------------------          -----------------            -----------------------------        --------------------
Fax:     610-231-9525                E-Mail:                       Fax:                                         E-Mail:
       ----------------------------          -----------------          -------------------------------                 -----------
Web site address:                                                  ISP:
------------------------------------------------------------------ ----------------------------------------------------------------

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MONTHLY CHARGES
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------------------------------------------------------------------- ---------------------------------------------------------------

        2 - Point to Point             $[ * ]  x   [ * ]   $9,920
------------------------------------  --------   --------  ------
                           DS3                       x
                                             ------     -------
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CUSTOMER SIGNED AND APPROVED
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By signing this order form, I authorize NEXTLINK Pennsylvania, (herein referred to as NEXTLINK) to make whatever inquiries are
necessary, including checking my credit history, to verify any statements made on this application and to determine my eligibility
for local and/or long distance service whenever NEXTLINK deems it necessary. I authorize any person or corporation to compile and
furnish NEXTLINK such information as is necessary to allow NEXTLINK to process this application. I agree to pay all charges
incurred on my NEXTLINK account, including any applicable state, federal or local use, excise, sales privilege taxes, duties or
similar liabilities by the stated due date and to adhere to all of the terms and conditions stated in NEXTLINK's tariffs and the
Terms and Conditions on the back of this Service Order and Agreement. Further, I represent that I am authorized to approve and
accept the responsibility of the terms and conditions herein.
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Authorized Signature:    /s/  Phillip Weller                  Authorized Signature:
                      ---------------------------                                   --------------------------
Company Name:               FASTNET                  Company Name:                    NEXTLINK Pennsylvania, Inc.
              -----------------------------------                  ---------------------------------------------------
Title/Date:           VP-Engineering                 6/28/99           Title/Date:    Vice President Branch Operations
            ---------------------------------------------------                   ------------------------------------
                         925 Berkshire Blvd. - Wyomissing, PA 19610 Phone 610-288-1234 - Fax:
                                                                                             -------------------------
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</TABLE>

[*] We are seeking confidential treatment of these terms,
which have been omitted. The confidential portion has been
filed separately with the Securities and Exchange Commission.

<PAGE>

                              TERMS AND CONDITIONS

1.       SERVICE: During the term hereof, NEXTLINK Pennsylvania ("NEXTLINK")
shall provide Customer with the telecommunications services designated on this
Service Order and Agreement ("Agreement"). The services offered by NEXTLINK
under this Agreement are offered pursuant to applicable tariffs, which are filed
with applicable federal and state regulatory agencies, and these terms and
conditions. In the event of a conflict between this Agreement and such tariffs,
the tariffs shall control. Tariffs are available for review at NEXTLINK's
offices. This Agreement and any attachments, together with the applicable
tariffs constitute the entire agreement of the parties and supercedes all prior
discussions or agreements, whether written or oral, including but not limited to
any advertising, brochures, or solicitations. Should Customer request additional
service(s) subsequent to execution of this Agreement, Customer and NEXTLINK
agree to execute an additional agreement for such service(s). Customer agrees to
cooperate with NEXTLINK to accomplish service activation by providing NEXTLINK
access to Customer's premises and facilitating testing and any other service
delivery requirements. Service activation shall commence when NEXTLINK equipment
has been installed and telephone service is made available to Customer.

2.       PAYMENT OBLIGATION: Customer shall pay NEXTLINK for service pursuant to
the terms and conditions of the applicable tariff(s) and this Agreement. Prices
for service are exclusive of applicable taxes. No later than thirty (30)
calendar days after service activation, NEXTLINK will bill Customer monthly for
service provided hereunder and usage itemization shall accompany each invoice.
Invoices shall be due and payable upon receipt. Undisputed charges for service
that are not paid within thirty (30) days after the invoice date shall be past
due. The lower of interest of 1.5% per month, or the maximum amount permitted by
law, will be charged on past due amounts beginning the 31st day following the
invoice date. If charges are not paid within ninety (90) days of the due date,
and NEXTLINK submits the account for collections, Customer shall pay all
collection costs including, but not limited to, reasonable Attorney's fees.
Failure to pay said bill within ninety (90) days may result in discontinuance of
service.

3.       TERM & RENEWAL: This Agreement shall be effective upon complete
execution by the parties. The term is set forth on the Service Order and shall
commence on the service activation date. If no term is specified or following
the expiration of the term, this Agreement shall continue on a month-to-month
basis, upon the terms and conditions in the applicable tariff(s) and specified
herein. In the event of early termination of this Agreement by Customer, or
termination by NEXTLINK for material breach, Customer shall pay NEXTLINK all
non-recurring charges reasonably expended to establish service to the Customer;
any disconnect, early cancellation, or termination charges incurred and paid to
third parties on behalf of customer; plus all recurring charges for the balance
of the then current term.

4.       LIABILITY/INDEMNIFICATION/WARRANTY: NEXTLINK agrees to respond to
emergency interruptions of service in a timely manner. NEXTLINK agrees to
maintain and service all NEXTLINK equipment necessary to fulfill the terms of
this Agreement at no expense to the Customer.

With respect to claims or suits by Customer, its customers, or any others for
damages relating to or arising out of acts or omissions involving initiation,
installation, provisioning or restoration of any services or facilities offered
under this Agreement, NEXTLINK's liability, if any, shall be limited to the
lesser of $500 or, in the event of any failure of service, an amount equal to no
more than the proportionate charge (based on the rates then in effect) for the
service for the period of time during which the service was affected. NEXTLINK
shall in no event be liable for loss of profits, or incidental, indirect,
exemplary, punitive, special or consequential damages suffered by Customer,
Customer's customers, or any other persons or entities and relating to or
arising out of the services, the system equipment, or any other obligation of
NEXTLINK under this Agreement or otherwise, including but not limited to,
temporary service interruptions or the failure by NEXTLINK or any third party to
repair the system equipment or services, or for any act or omission of any other
entity, company or companies furnishing a portion of the service.

IN ACCORDANCE WITH THE REQUIREMENTS OF UNIFORM COMMERCIAL CODE, NEXTLINK MAKES
NO REPRESENTATION OR WARRANTY EITHER EXPRESS OR IMPLIED REGARDING THE SERVICES
OR SYSTEM EQUIPMENT, AND SPECIFICALLY DISCLAIMS ANY WARRANTY, INCLUDING BUT NOT
LIMITED TO ANY IMPLIED WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A
PARTICULAR PURPOSE, AND ASSUMES NO OBLIGATION WITH RESPECT TO THE ENFORCEMENT OF
ANY MANUFACTURER'S WARRANTIES AND GUARANTEES. NO DEFECT, UNFITNESS, OR OTHER
CONDITION OF SYSTEM EQUIPMENT OR SERVICES SHALL RELIEVE CUSTOMER OF THE
OBLIGATION TO PAY ANY CHARGES HEREUNDER OR PERFORM ANY OTHER OBLIGATIONS UNDER
THIS AGREEMENT.<PAGE>

                                                                  EXHIBIT 10.17
                                SERVICE AGREEMENT

This Agreement dated as of ___ 5/12/1999 by and between Hyperion Communications
of New Jersey, LLC and ____________ FastNet ____________________ ("Customer").

Hyperion is a certified local exchange, switched access, long distance and
dedicated access service carrier.

Customer is desirous of Hyperion providing to Customer telecommunications
service(s) and hereby agrees to purchase the services(s) at the cost(s) and
term(s) as set forth herein.

In consideration of the mutual promises and covenants contained herein the
parties agree to the following:

<TABLE>
<CAPTION>
--------------- ----------------------------- -------- -------------- ------------- ------------ --------------
                                                                                                     Total
                                                                         Total        Monthly       Monthly
                                                       Installation   Installation   Recurring     Recurring
   Quantity               Service              Term        Cost           Cost         Cost          Cost
<S>              <C>                          <C>      <C>            <C>           <C>          <C>
--------------- ----------------------------- -------- -------------- ------------- ------------ --------------
      56                    PRI                  1          $0             $0          [*]         $20,160**
--------------- ----------------------------- -------- -------------- ------------- ------------ --------------
      3                 Blocks 20#'s             1          $0             $0          [*]            $48
--------------- ----------------------------- -------- -------------- ------------- ------------ --------------

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

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

--------------- ----------------------------- -------- -------------- ------------- ------------ --------------
                                              Total*                        $0                      $20,208
--------------- ----------------------------- -------- -------------- ------------- ------------ --------------
</TABLE>

[**2 Months Free Service from date of Installation]

(Additional Terms and Conditions follow on the reverse side.)

CUSTOMER INFORMATION & APPROVAL

<TABLE>
<S>                                                     <C>
Company Name:                FastNet                    Name:                      Phil Weller
              -------------------------------                 ------------------------------------------
Address:  3864 Courtney St., Ste. 130                   Title:                     Vice-President
        -------------------------------------                 ------------------------------------------
City, state, ZIP:  Bethlehem, PA 18017                  Signature:  /s/ Phil Weller
                 ----------------------------                     --------------------------------------

Account Executive                                       Sales Manger               Phil Weller
-----------------                                       ------------               ---------------------
Name:                        Mark A. Sirianni           Name:                      John Hellgren
     ----------------------------------------                -------------------------------------------
Signature:                                              Signature:
          -----------------------------------                     --------------------------------------

General Manager
---------------
Name:  Barak Byers
Signature:
          -----------------------------------
</TABLE>

[*] We are seeking confidential treatment of these terms, which have been
omitted. The confidential portion has been filed separately with the
Securities and Exchange Commission.

<PAGE>

                         ADDITIONAL TERMS AND CONDITIONS

1.   PAYMENT. Payment for service(s), including applicable federal, state, and
     local taxes, is due upon receipt of invoice. Beginning thirty (30) days
     after the date of invoice, interest on late payments will accrue at the
     rate of 1.5% per month, or the highest rate allowed by law on the unpaid
     balance, whichever is lower.

2.   ADDITIONAL CHARGES. Customer is subject to the applicable charges for
     moves, adds, changes, and upgrades for those items covered by this Service
     Agreement. All service(s) other than those stated herein will be provided
     at the prevailing charges.

3.   TARIFFS. Additional terms and conditions of this Service Agreement are set
     forth in Hyperion tariffs which are subject to change and are on file with
     the applicable state and/or federal regulatory authorities. Except for the
     cost(s) of service(s) on a term of more than month to month, these tariffs
     fully determine the rights and obligations of Customer and, in the event of
     any conflicts between this Service Agreement and the tariff, the tariff
     shall control.

4.   TOTAL SERVICE RESALE. In the event that service(s) are sold to customer via
     Total Service Resale, Hyperion reserves the right to transfer Customer, at
     no additional charge, to Hyperion's partial or total on-net services.

5.   ASSUMPTION/PURCHASE OF CONTRACT. In the event that Hyperion assumes or
     purchases an existing contract between Customer and another
     telecommunications carrier, Customer shall be indemnified and held harmless
     against any and all termination liability associated with said contract so
     long as Customer enters into a Service Agreement with Hyperion for a term
     equal to or greater than the remaining term of Customer's existing
     contract.

6.   NOTICE OF TERMINATION. In the event Customer intends to terminate this
     Service Agreement prior to expiration of the term set forth herein, if more
     than a month to month term, Customer shall provide Hyperion three (3)
     months written notice. In the event that Customer does not so notify
     Hyperion, Customer shall owe Hyperion an additional three (3) months of
     charges in additional to the termination liability outlined below.

7.   TERMINATION LIABILITY. If Customer terminates service prior to the
     fulfillment of the term, then a termination liability will be due to
     Hyperion from Customer. The termination liability shall be the greater of
     the following:

     a)   the difference between the term period and the actual number of months
          the service has been in effect at the time of termination multiplied
          by the monthly rate for such service; or

     b)   the termination liability charges associated with such assumed or
          purchased contract.

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