EXHIBIT 10.11

      CONFIDENTIAL MATERIALS HAVE BEEN OMITTED FROM THIS EXHIBIT PURSUANT
          TO A REQUEST FOR CONFIDENTIAL TREATMENT AND HAVE BEEN FILED
            SEPARATELY WITH THE SECURITIES AND EXCHANGE COMMISSION.
                          ASTERISKS DENOTE OMISSIONS.

                   NORTEL NETWORKS GLOBAL PURCHASE AGREEMENT

THIS  AGREEMENT   ("Agreement")   between  NORTEL   NETWORKS  INC.,  a  Delaware
corporation  ("Nortel  Networks"),  and  Savvis  Communications  Corporation,  a
Missouri  corporation  ("Company"),  is effective  on June 30, 2000  ("Effective
Date").

The parties agree as follows:

1. SCOPE

   a)    Under this Agreement,  Company may (i) purchase hardware  ("Hardware");
         (ii) obtain a license to use software and  documentation  ("Software");
         and (iii) purchase associated services ("Services") for the DMS 10, DMS
         100, DMS 200, DMS 250, DMS 300, DMS 300/250,  DMS 500, DMS GSP, Optical
         Networks, TransportNode and NIS product families and the Data Products,
         as defined in Article 9 (b).  "Products"  shall mean  individually  and
         collectively, the Hardware and Software.

   b)    Supplemental  terms for Company's  purchase  and/or  license of various
         types of other Products  and/or  Services may be incorporated by mutual
         written consent ("Supplemental Documentation").

   c)    Products are provided  only for  Company's own use in the countries set
         forth in the Supplemental  Documentation  (the "Territory") and not for
         resale.

   d)    The parties  acknowledge  that Orders (defined below)  hereunder may be
         placed by  Company's  Affiliates  (as defined  herein) and Products and
         Services  may be supplied by Nortel  Networks'  Affiliates  (as defined
         herein).  Any  references  herein to Company shall be deemed to include
         Company's  Affiliates and references to Nortel Networks shall be deemed
         to include Nortel Networks Affiliates.  In the case of Nortel Networks,
         "Affiliate"  means an  entity  in  which  Nortel  Networks  Corporation
         directly  or  indirectly  owns or  controls  (and  continues  to own or
         control) more than fifty percent (50%) of the shares  entitled to elect
         the board of directors of such entity, and Nortel Networks Data GmbH of
         Germany, Matra Nortel Networks Communications S.A.S. and Nortel Network
         Corporation.  In the case of  Company  "Affiliate"  means an  entity in
         which Company directly or indirectly owns or controls (and continues to
         own or control) more than fifty percent (50%) of the shares entitled to
         elect the board of directors of such entity. Upon request, from time to
         time,  a party shall  provide the other with a list of its then current
         Affiliates who may be purchasing or supplying  Products and/or Services
         hereunder.   Company   absolutely,   irrevocably  and   unconditionally
         guarantees  the  perfomance of every Company  Affiliate  Issuing Orders
         and/or otherwise acting under this Agreement.  Company hereby expressly
         waives  any  other  diligence,   protest  or  notice  as  well  as  any
         requirement  that Nortel  Networks  exhaust any remedy or right against
         such Company Affiliate.

2. TERM

This Agreement begins on the Effective Date and continues until thirty (30) days
after a party  notifies the other in writing  that it intends to terminate  this
Agreement.  Any terms of this  Agreement  which by their  nature are intended to
survive and the rights and  obligations of either party under any accepted Order
survive the termination of this Agreement.

3. ORDERS

   a)    To purchase  and/or  License  Products  and/or  Services,  Company will
         submit a  purchase  order or like  documentation  ("Order")  to  Nortel
         Networks specifying all of the following, if applicable:  (i) the types
         and quantities of Products and Services;  (ii) the  applicable  prices,
         charges and fees with respect to such Products and/or  Services;  (iii)
         the  quotation  number with respect to such Products  and/or  Services;
         (iv) the addresses for delivery,  performance and installation; (v) the
         incorporation  by  reference of this  Agreement;  (vi) the shipment and
         turnover  dates;  and (vii) any other  information  required under this
         Agreement  to be included  in an Order.  All Orders will be governed by
         and cannot alter the terms and conditions of this Agreement. Orders are
         subject  to  acceptance  by  Nortel  Networks;  however,  any Order not
         rejected within fifteen (15) business days of Nortel Networks'  receipt
         is deemed  accepted  provided  that no  additional or special terms and
         conditions  have been written on the face of or otherwise  incorporated
         into such Order.

   b)    Company may request additions, alterations, deductions or deviations to
         an Order subject to the condition that such changes and any adjustments
         resulting from such changes  including,  but not limited to,  schedules
         and  prices,   shall  be  mutually  agreed  upon  and,  if  so  agreed,
         subsequently  detailed in a written  revision to the  applicable  Order
         ("Change  Order").  Company  acknowledges  that a premium charge may be
         applied by Nortel  Networks  should Nortel  Networks agree to process a
         Change  Order  outside of its  Standard  Order  processing  cycle for a
         Product  or in the event that a Change  Order  requires  an  additional
         amount of
<PAGE>

         work  (such as  engineering)  to be  undertaken  to  comply  with  such
         changes.

   c)    If,  prior  to the ship  date,  Company  cancels  all or any part of an
         Order,  Company shall pay to Nortel Networks a cancellation  charge for
         the  Product(s)  that have been  canceled as follows:  i) if  Company's
         cancellation notice is received by Nortel Networks fifteen (15) or more
         days prior to the ship date, then Company shall pay 100% of engineering
         charges plus 10% of the Product price, or ii) if Company's cancellation
         notice is received by Nortel Networks fourteen (14) or fewer days prior
         to the ship date,  then Company shall pay 100% of  engineering  charges
         plus 15% of the Product price.  However,  Orders for Products that have
         been  shipped,  and  Orders  for Data  Products,  may not be  canceled.
         Furthermore,  Orders for Products which Nortel customizes in accordance
         with a specific Company request may not be canceled.

   b)    Upon request,  Company will  periodically  submit to Nortel  Networks a
         non-binding   forecast  of  Products   and/or   Services  that  Company
         anticipates purchasing.

4. PRICE AND PAYMENT

   a)    The  charge  for any  Product  or  Service  ordered  will be per Nortel
         Networks'  price list then in effect or per written  mutual  agreement.
         Unless  specified,  prices do not include freight and insurance charges
         or any applicable taxes,  assessments or duties.  Company shall pay all
         charges for: (i) Products within thirty (30) days after delivery to the
         carrier at Nortel Networks'  shipping point  ("Delivery  Location") and
         (ii) Services within thirty (30) days after completion, except that (a)
         recurring  Services  will be paid for  quarterly,  in advance,  and (b)
         installation  services may be invoiced and payable (at Nortel Networks'
         option)  upon  completion  of the  Services  or  upon  delivery  of the
         associated Products to the Delivery Location.

   b)    For any overdue  payments for invoices  submitted in conformance to the
         terms  hereof,  Nortel  Networks is entitled  to collect  from  Company
         interest,  calculated daily from the date past due, at one and one half
         percent  (1.5%) per month (18% per annum) or such lesser rate as may be
         the maximum permissible rate under applicable law.  Notwithstanding the
         foregoing  for  purchases   where  Nortel  Networks  is  providing  the
         financing and such  financing has not been  assigned,  no such interest
         shall accrue.

5. TAXES

Unless Company provides a certificate of exemption for the applicable taxes in a
timely  manner but in no event after Nortel  Networks  payment of such  amounts,
Company must  promptly pay directly or reimburse  Nortel  Networks all taxes and
charges,  duties  or  assessments  imposed  by  any  federal,  state,  or  local
governmental  or other taxing  authority  relating to the  purchase,  ownership,
possession, use, operation or relocation of Products or Services,  excluding all
taxes computed upon the net income of Nortel  Networks.  Applicable  sales taxes
shall be billed as a separate item on the invoice to the extent reasonable.

6. SOFTWARE LICENSE

   a)    Nortel Networks grants to Company, a personal, non-exclusive,  right to
         use  Software  only  with  Hardware  or other  authorized  material  in
         permitted  applications  and to the extent that the applicable  charges
         have been paid ("Licensed  Software").  Software contains trade secrets
         of Nortel  Networks and its suppliers,  and Company is granted no title
         or ownership rights to Software.

   b)    Company shall: (i) not reproduce,  copy, or modify Software in whole or
         in part except as  authorized by Nortel  Networks,  except that Company
         may make a reasonable  number of copies of Licensed Software solely for
         back up  purposes;  (ii) except to the extent such  prohibition  is not
         enforceable  under the laws of the  country in which  Software is being
         used, not decompile, reverse engineer, disassemble,  reverse translate,
         or in any other manner decode  Software,  and (iii) upon termination of
         the license for any reason, promptly return Software to Nortel Networks
         or certify its destruction. Company shall abide by any additional terms
         provided by Nortel  Networks  with  respect to any terms  contained  in
         "shrink" or "click" wrap licenses, or other pass-through  licenses, for
         Software sourced from third party vendors.

   c)    Company shall not have the right to assign or sublicense  its rights in
         Software without the written consent of Nortel Networks, which will not
         be unreasonably withheld, provided however, that where use of a Product
         requires  the  download of  Software to a customer of Company.  Company
         shall be entitled to  sublicense  to such  customer  after the customer
         agrees  to terms  no less  restrictive  than  those  contained  in this
         Article 6 and that Nortel Networks is a beneficiary of such sublicense.

   d)    Certain  Software  identified  by Nortel  Networks  may be  modified to
         create  derivative  software  applications  or files  ("Applications").
         Unless  otherwise  agreed in writing,  each party owns all intellectual
         property rights for any Applications it creates.  NORTEL NETWORKS SHALL
         HAVE NO LIABILITY TO COMPANY OR ANY THIRD

<PAGE>

                     NETWORKS GLOBAL PURCHASE AGREEMENT

         PARTY  WITH  RESPECT  TO  ANY  CLAIMS  OR  DAMAGES  ARISING  OUT OF THE
         MODIFICATION OR CREATION OF ANY APPLICATION BY COMPANY.

   e)    Nortel Networks may access by remote polling or other  reasonable means
         any site in which  Software  has been  installed  to  determine  if any
         Software has been activated,  or its uses extended,  without payment of
         the  applicable  fee. Such polling  shall be conducted  pursuant to the
         Company's   reasonable   security   considerations   which   shall  not
         significantly  inhibit the polling  activity.  Nortel  Networks has the
         right to invoice  Customer  and Customer  shall pay all charges  within
         thirty (30) days of such  invoice for any  activated or extended use of
         such Software.

7. TITLE, RISK OF LOSS AND DELIVERY

   a)    For Products to be delivered  in the United  States or Canada,  risk of
         loss of damage to  Products  passes to  Company  upon  delivery  to the
         carrier  at  the  Delivery  Location.   Unless  specifically   provided
         otherwise in the Supplemental Documentation.  Products not for delivery
         in the United  States or Canada  shall be  provided  "Ex Works"  Nortel
         Networks'  Delivery  Location.  ("Ex  Works"  shall  have  the  meaning
         ascribed to it in Incoterms  2000.) Title to the Hardware shall pass to
         Company  upon  final  payment  of the  total  purchase  price  and  any
         additional  monies  due.  Company  grants  Nortel  Networks,  and  will
         cooperate  with the  perfection  and  maintenance  of, a purchase money
         security  interest (or other security  interest as provided by the laws
         of the applicable  jurisdiction) in the Products and any proceeds until
         the  total  amount  on  account  of such  Products  is  paid to  Nortel
         Networks.  Company  authorizes  Nortel  Networks to file  financing  or
         continuation  statements and amendments and similar documents  relating
         to the Products  without  signature of Company where  permitted by law.
         Nortel  Networks  may also  reproduce  and file this  Agreement  or any
         financing  statement covering the Products,  or any part thereof,  as a
         sufficient financing statement.

   b)    Company will have the installation site(s) ready and complete its other
         responsibilities  on  time  and in  accordance  with  Nortel  Networks'
         requirements. Company shall reimburse Nortel Networks for all Company's
         failure to comply with Nortel Networks' requirements.

   c)    Company  will  notify  Nortel  Networks  in  writing  of all  hazardous
         materials  (as  defined by the  applicable  competent  authority)  that
         Nortel  Networks  may  encounter  during the  performance  of Services.
         Nortel  Networks may  discontinue the performance of the Services until
         all Hazardous Materials have been removed at Company's expense. Company
         shall defend,  indemnify and hold Nortel Networks harmless from any and
         all  damages,  claims,  losses,  liabilities  and  expenses,  including
         attorney's   fees,   which  arise  out  of  Company's  breach  of  such
         obligations.

8. ACCEPTANCE

Company is deemed to have accepted a Product,  excluding Data  Products,  on the
first to occur of: (i) receipt of the  Product at the  Delivery  Location  for a
furnish-only  Order:  (ii) completion of Nortel Networks  installation  Services
with respect to the  Product;  or (iii)  placement of the Product into  service.
With respect to Data  Products,  acceptance  is deemed to have occurred upon the
ship date.  Acceptance cannot be postponed due to any deficiencies not imputable
to Nortel Networks.  If, prior to Company's deemed  acceptance  above, or in the
case of  furnish-only  Products and Data Products upon delivery of such Products
to  Company,   Nortel  Networks  and  Company  reasonably   determine  that  any
non-conforming  Product(s)  must be  replaced,  Company  agrees to  return  such
Product(s) must be replaced,  Company agrees to return such Product(s) to Nortel
Networks in accordance with Nortel  Networks'  instructions at Nortel  Networks'
expense.

9. WARRANTY

   a)    Nortel  Networks  warrants  that during the  Warranty  Period,  defined
         below,  (i) Hardware is free from defects in materials and workmanship,
         substantially conforms to Nortel Networks' published specifications and
         is free from any third party lien or other  encumbrance on title,  (ii)
         Software,  when  used  in the  specified  operating  environment,  will
         substantially conform to its published specifications and shall be free
         of computer viruses upon shipment, and (iii) Services will be performed
         in a professional and workmanlike manner. Unless otherwise specified in
         Supplemental  Documentation  or in  Section  (b) below,  the  "Warranty
         Period"  for (i)  Products  is  twelve  (12)  months  from  the date of
         delivery  at the  Delivery  Location  and (ii)  Services is twelve (12)
         months from their completion date.

   b)    The  following  Data  Products  shall have the  corresponding  Warranty
         Periods:
                                  Page 3 of 7                       CONFIDENTIAL
<PAGE>

                   NORTEL NETWORKS GLOBAL PURCHASE AGREEMENT


DATA PRODUCTS       HARDWARE     SOFTWARE       SERVICES
-------------       ---------    ---------      --------------
Etherloop           12 months    12 months      12 months from
                    from         from           completion
                    Delivery     Delivery
--------------------------------------------------------------------------------
CVX 1800,           12 months    90 days        12 months from
SS7 Gateway         from ship    from ship      completion
and Shares          date         date
--------------------------------------------------------------------------------
Internet Call       6 months     6 months       6 months from
Waiting             from ship    from ship      completion
Voice Buttons       date         date
--------------------------------------------------------------------------------
Enterprise          See then-    See then-      See then-current
Data                current      current        price list
Products            price list   price list
--------------------------------------------------------------------------------

   c)    Nortel  Networks' sole obligation  under this warranty is to, at Nortel
         Networks' discretion,  repair, replace or otherwise correct the defects
         in Products or Services Hardware repaired, replaced or corrected during
         the  Warranty  Period is  warranted  for the  balance  of the  original
         Warranty  Period and,  excluding Data  Products,  replaced or corrected
         Hardware  shall be  warranted  for  ninety  (90) days from the date the
         repair, replacement or correction is effected if such period is greater
         than the balance of the original Warranty Period.  Replacement Hardware
         may be new or  reconditioned  to  perform as new,  at Nortel  Networks'
         option. Company shall bear risk of loss or damage and shall pay for all
         transportation  charges for Products  returned to Nortel Networks,  and
         Nortel  Networks  shall  bear  risk  of  loss  or  damage  and  pay for
         transportation  charges for repair or replacement  Products  shipped to
         Company.  Any exchanged Hardware becomes Nortel Networks' property and,
         subject  to  Section  7  (Title,  Risk  of  Loss  and  Delivery),   its
         replacement becomes the Company's property.

   d)    Services  (including  in-warranty  Services)  will be made available to
         Company in accordance  with,  and within the response times defined in,
         Nortel Networks' standard practices and procedures.

   e)    These warranties do not apply where the  non-conformance  is due to (i)
         accident,  fire, explosion,  power failure,  power surge or other power
         irregularity,  lightning,  alteration,  abuse,  misuse  or  repair  not
         performed by Nortel Networks';  (ii) improper storage;  (ii) failure to
         comply with all specified  applicable  environmental  requirements  for
         Products; (iv) improper installation,  maintenance,  operation or other
         service in connection  with Products  except where  performed by Nortel
         Networks or on Nortel  Networks'  behalf by authorized  subcontractors;
         (v) use of Products in conjunction  with an  incompatible  product or a
         product not  purchased  from Nortel  Networks;  (vi) any error,  act or
         omission by anyone  other than Nortel  Networks;  (vii) use of Products
         outside  the  country  in which  they were  supplied;  or (viii) to the
         extent Company's breach of this Agreement or an Order  contributes to a
         Product failure.

   f)    These  warranties  do not  apply  to any  (i)  hardware  not of  Nortel
         Networks'   manufacture,   software  not  owned  by  Nortel   Networks'
         manufacture,  software not owned by Nortel  Networks,  or  Applications
         created by Company;  (ii) any Software  which is activated,  or its use
         extended,  without  payment of the applicable  fee or Nortel  Networks'
         written  consent;  (iii)  Software  that is not  maintained  at  Nortel
         Networks'  current  Software that is not maintained at Nortel Networks'
         current  Software  release  level or within  at least one (1)  previous
         Software release level unless  specified  otherwise in Nortel Networks'
         documentation;   and  (iv)  items  normally   consumed  during  Product
         operation, and (v) defects that are not identified in writing to Nortel
         Networks within the applicable warranty period.  Nortel Networks passes
         through to Company any warranty  rights  granted to Nortel  Networks by
         the vendor of any third  party  hardware or Software to the extent that
         Nortel  Networks is permitted to do so pursuant to its agreements  with
         such third party vendors.

   g)    THESE WARRANTIES AND REMEDIES CONSTITUTE THE ONLY WARRANTY  OBLIGATIONS
         OF NORTEL  NETWORKS  WITH  RESPECT TO THE PRODUCTS AND SERVICES AND ARE
         COMPANY'S SOLE AND EXCLUSIVE  REMEDIES IN THE EVENT THAT THE WARRANTIES
         ARE  BREACHED.  THEY ARE IN LIEU OF ALL OF THE  WARRANTIES,  WRITTEN OR
         ORAL, STATUTORY,  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO, THE
         IMPLIED  WARRANTIES  OF  MERCHANTABILITY  AND FITNESS FOR A  PARTICULAR
         PURPOSE. NORTEL NETWORKS IS NOT RESPONSIBLE FOR ANY WARRANTY OFFERED BY
         COMPANY TO ANY CUSTOMER(S) OF COMPANY.

10. CONFIDENTIAL INFORMATION

    a)   Confidential information ("Information') means all business, technical,
         marketing and financial information, data and computer programs that is
         clearly marked as confidential, proprietary or the like.

    b)   Each party  which  receives  the other  party's  Information  shall use
         reasonable care to hold such Information in confidence and not dislcose
         such  Information  to anyone  except is employees and employees of such
         party's  Affiliates  with a need to know for  purposes of carrying  out
         this Agreement.

                                  page 4 of 7                       CONFIDENTIAL
<PAGE>

                   NORTEL NETWORKS GLOBAL PURCHASE AGREEMENT

    c)   The  obligations  of either party  pursuant to this  Article  shall not
         extend to any Information which (i) a recipient can demonstrate through
         written documentation was already known to the recipient;  (ii) becomes
         known or generally  available  to the public  (other than by act of the
         recipient)  subsequent  to its  disclosure;  (iii) is disclosed or made
         available  in writing to the  recipient  by a third party having a bona
         fide right to do so and without  similar  confidentiality  obligations;
         (iv) is  independently  developed by recipient as  demonstrated  by its
         business  records;  or (v) is required to be  disclosed  by subpoena or
         other  process of law,  provided  that the  recipient  shall notify the
         disclosing  party promptly of any such subpeona or other process of law
         requiring disclosure.

11. EXCUSABLE DELAYS

Except for  payment  obligations,  if the  performance  by a party of any of its
obligations  under  this  Agreement  shall be  interfered  with by reason of any
circumstances  beyond the reasonable  control of that party,  including  without
limitation,  fire,  explosion,  acts of God, war,  revolution,  civil commotion,
unavailability  of supplies or sources of energy,  power  failure,  breakdown of
machinery,  delays regarding zoning,  easements or deed restrictions,  any legal
proceedings   between   parties   unrelated  to  the  parties  hereto  or  labor
difficulties,  including without limitation,  strikes,  slowdowns,  picketing or
boycotts,  then that party shall be excused from such  performance  for a period
equal to the delay resulting from the applicable  circumstances  so long as that
party is diligently pursuing means of resolution,  and such additional period as
may be reasonably necessary to allow that party to resume its performance.  With
respect to labor difficulties as described above, a party shall not be obligated
to accede to any demands being made by employees or other personnel.

12. PATENTS, TRADEMARKS AND COPYRIGHT

    a)   Nortel  Networks  shall,  at its own  expense,  (i) defend  Company (in
         connection   with  such  defense,   Nortel  Networks  shall  be  solely
         responsible  for  its  litigation   costs,   including  its  attorney's
         expenses)  in any claim or legal action  alleging  that the purchase or
         use of any  Product or any  portion  thereof,  other  than third  party
         hardware  or  software  not   incorporated   during  Nortel   Network's
         manufacturing process,  infringes any patent, trademark,  trade secret,
         copyright or other proprietary right  ("Infringement  Claim);  and (ii)
         pay all  damages  and  costs,  including  reasonable  attorney's  fees,
         awarded against Company,  or pursuant to settlement agreed to by Nortel
         Networks,  in  such  actions  which  are  directly  attributable  to an
         Infringement Claim.  Company may participate in such defense at its own
         expense.

As a  condition  of such  defense or  payment,  Company is  required to (i) give
Nortel Networks prompt written notice of any  Infringement  Claim;  (ii) provide
Nortel  Networks with the sole control of the defense  and/or  settlement of the
Infringement  Claim;  (iii) cooperate fully with Nortel Networks in such defense
or settlement.

    b)   In the event Nortel Networks becomes aware of a potential  Infringement
         Claim, Nortel Networks may (or in the case of an award of an injunction
         shall) at its sole option and expense,  either: (i) procure for Company
         the right to continue using the alleged infringing  Products);  or (ii)
         replace or modify the alleged infringing  Product(s) with an equivalent
         product(s) so that  Company's use is  non-infringing.  If none of these
         alternatives  is  reasonably  available,  Company  agrees to return the
         Product(s)  to Nortel  Networks on Nortel  Networks'  written  request.
         Nortel Networks will then give Customer a credit equal to Company's net
         book  value  for  the   Product(s)   provided   Company  has   followed
         generally-accepted  accounting  principles.  Any  such  claims  against
         Company  or  liability  for  infringement   arising  from  use  of  the
         Product(s)  following a request for return by Nortel  Networks  are the
         sole responsibility of Company.

    c)   Nortel  Networks  has no  obligation  or  liability  in  respect to any
         Infringement  Claim in the  event  that  the  accused  Product:  (i) is
         manufactured,  designed or supplied  by Nortel  Netowrks in  accordance
         with any design or special instruction  furnished by Company,  provided
         that the  Infringement  Claim is  related  to such  design  or  special
         instruction;  (ii) is used by Company in a manner or for a purpose  not
         contemplated  by this Agreement or Nortel  Networks'  Product  customer
         documentation;  (iii) is used or located by Company in a country  other
         than the country for which it was supplied;  (iv) is used by Company in
         combination  with other products or applications not provided by Nortel
         Networks,  including  any  software  developed  by Company  through the
         permitted use of Products, provided that Infringement Claim arises from
         such  combination  or the use  thereof;  or (v) is  modified by Company
         without Nortel Network's  written  authorization.  If Company continues
         use of the affected Product notwithstanding Nortel Networks' request to
         replace or modify  pursuant  to Section b) (ii) or its  requirement  to
         return  pursuant  to Section  b) (iii),  Nortel  Networks  shall not be
         liable for such use. In such cases,  Company  shall  indemnify and hold
         Nortel  Networks  harmless  against any loss,  cost,  expense,  damage,
         settlement, or other liability

<PAGE>

                   NORTEL NETWORKS GLOBAL PURCHASE AGREEMENT

         incurred by Nortel Networks with respect to the Infringement Claim.

    d)   Nortel Networks'  cumulative  liability under this Article 12 shall not
         exceed one hundred  percent (100%) of the purchase price of the Product
         or portion of the Product, giving rise to the Infringement Claim(s).

    e)   THE PROVISIONS OF THIS ARTICLE 12 CONSTITUTE THE EXCLUSIVE  RECOURSE OF
         EACH PARTY AND THE ENTIRE  OBLIGATION  AND LIABILITY OF EACH PARTY WITH
         RESPECT TO ANY CLAIM FOR INFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS.

13. LIABILITY

    a)   Each party will  defend,  indemnify  and hold the other party  harmless
         from any liabilities,  claims or demands, including costs, expenses and
         reasonable  attorney's  fees,  that  are  made  by  anyone  for  bodily
         injuries,  including death, or damage to tangible  property,  resulting
         from the  negligence  and/or  willful  misconduct  of that  party,  its
         employees or agents, in the performance of this Agreement. A party will
         notify the other party promptly of written claims or demands against it
         for which the other party is  responsible.  If the damage  results from
         the  negligence  or  willful  misconduct  of  both  parties,  then  the
         responsibility for such damage will be allocated between the parties in
         accordance with their proportion of fault.

    b)   IN NO EVENT WILL EITHER  PARTY BE LIABLE  (WHETHER  IN CONTRACT,  TORT,
         INCLUDING  NEGLIGENCE,  OR OTHERWISE)  FOR ANY  INDIRECT,  INCIDENTAL,
         SPECIAL,  PUNITIVE,  MULTIPLE OR CONSEQUENTIAL DAMAGES,  INCLUDING LOST
         REVENUES OR PROFITS OR OTHER  FORMS OF  ECONOMIC  LOSS,  OF ANY NATURE
         WHATSOEVER  FOR ANY BREACH OF THIS  AGREEMENT  OR  OTHERWISE  EXCEPT AS
         PROVIDED  IN  ARTICLES  6 AND 10. IN NO EVENT  SHALL  NORTEL  NETWORKS'
         LIABILITY  FOR ANY  OTHER  DAMAGES  EXCEED  THE  PURCHASE  PRICE OF THE
         PRODUCT OR SERVICES  GIVING RISE TO THE DAMAGES.  THIS PROVISION  SHALL
         SURVIVE ANY TERMINATION OF THIS AGREEMENT.

14. DEFAULT

Either party may suspend or terminate its  performance  under this  Agreement in
the event of a material  breach that remains  unsecured  for thirty (30) or more
days by the other party.

15. ASSIGNMENT

Neither Company nor Nortel Networks may assign or transfer this Agreement or any
of its rights or  obligations  without  the prior  written  consent of the other
party, which consent will not be unreasonably withheld;  except that Company may
assign this  Agreement  to a successor in interest to  substantially  all of its
assets,  whether by merger,  consolidation  or sale,  provided i) such  assignee
agrees in writing to be bound by the terms of this Agreement,  ii) such assignee
is not a  competitor  of Nortel  Networks,  and iii) such  assignment  shall not
relieve Company of any of its obligations under this Agreement.  Notwithstanding
the foregoing,  Nortel Networks may assign or subcontract  this Agreement or any
of  its  obligations  to its  parent  or any  of  its  Affiliates,  but no  such
assignment  shall relieve Nortel Networks of any of its  obligations  hereunder.
Company consents,  without  qualification,  to the sale of receivables by Nortel
Networks without further notice, and Nortel Networks may disclose the provisions
of this  Agreement  to  prospective  purchasers  of the  receivables,  and their
agents.

16. GOVERNING LAW

The construction,  interpretation  and performance of this Agreement is governed
by the laws of the State of New York,  except for its rules with  respect to the
conflict of laws.

17. NOTICE

All notices will be in writing and are deemed given when  delivered by (i) hand;
(ii) facsimile  transmission;  (iii) certified mail; or (iv) overnight  delivery
service, addressed as follows:

If to Company:

___________________________
___________________________
___________________________
Attention:_________________
Facsimile:_________________
Telephone:_________________

If to Nortel Networks:

  Nortel Networks Inc.
  5405 Windward Parkway
  Alpharetta, Georgia 30004
  Attention: Contracts Manager
  Facsimile: 770-708-5090
  Telephone: 770-708-5472

<PAGE>

                    NORTEL NETWORKS GLOBAL PURCHASE AGREEMENT

Either  party may change its address by a notice given to the other party in the
manner above.

18. ADDITIONAL TERMS

    a)   Company  shall not export any Products or technical  data received from
         Nortel  Networks  pursuant  to this  Agreement,  or  release  any  such
         Products  or  technical  data with the  knowledge  or intent  that such
         Products  or  technical  data will be exported  or  transmitted  to any
         country or foreign  nationals of any country except in accordance  with
         applicable laws and regulations concerning the exporting of such items.
         Company  shall  obtain all  appropriate  government  authorizations  in
         accordance with  applicable law prior to exporting or transmitting  any
         such  Products or technical  data.  Nortel  Networks  will provide such
         assistance   as   Company   reasonably    requests   to   obtain   such
         authorizations.  Nortel  Networks  shall  have  no  obligation  to sell
         Products  in  any  country  in  which  the   Products   have  not  been
         homologated.  If Company  desires to use the  Products  in a country in
         which the Products have not been  homologated,  and Nortel  Networks in
         its sole discretion agrees that Products may be used by Company in such
         country,  then Company and Nortel Networks will mutually agree upon the
         allocation  between  the parties of the costs and  expenses  associated
         with homologating such Products for use in such country.

    b)   Notwithstanding the provisions of Article 4, in the event of any change
         in the specifications,  or in manufacturing or delivery processes, as a
         result of  governmental  requirements,  Nortel Networks may, upon prior
         notice to  Company,  increase  its  charges to cover  Nortel  Networks'
         direct and indirect costs resulting from such change.

    c)   If any provision  hereof is determined to be legally  unenforceable  or
         invalid,  the  remaining  provisions  will  continue  in full force and
         effect and the parties will  substitute  a provision  that most closely
         approximates the economic effect and intent of the invalid provisions.

    d)   A party shall not release any advertising or other  publicity  relating
         to the  Agreement or the  contents  thereof  without the prior  written
         approval of the other party.

    e)   The failure by either party at any time to require  performance  by the
         other  party,  or to  claim a  breach  of this  Agreement,  will not be
         construed  as  affecting  any  subsequent  breach  or right to  require
         performance.

    f)   This Agreement, including Supplemental Documentation, comprises all the
         terms,  conditions,  representations,  warranties  and agreement of the
         parties with respect to the subject  matter hereof and  supersedes  all
         previous negotiations,  proposals, commitments,  writings, publications
         and understandings of any nature whatsoever.

    g)   In the event of a conflict  between the main body of this Agreement and
         the provisions set forth in Supplemental Documentation,  the provisions
         of the Supplemental  Documentation prevail with respect to any Products
         and Services covered by it.

IN WITNESS WHEREOF,  the parties by their duly authorized  representatives  have
executed this Agreement.

NORTEL NETWORKS INC.                        COMPANY

By:    /s/ Cynthia C. Hemme                 By:   /s/ Steven M. Gallant
     -----------------------------------       ---------------------------------
      Cynthia C. Hemme
      Vice President & Assistant General   Name:  Steven M. Gallant
      Counsel  Contracts, Service               -------------------------------
      Provider Solutions-Americas
Title:                                     Title: VP General Counsel
       ---------------------------------          ------------------------------

Date:       6/30/00                         Date:     6/30/00
         -------------------------------          ------------------------------



    00       6-30-00
------------------------
  APPROVED AS TO FORM
------------------------
    LAW DEPARTMENT
NORTEL NETWORKS INC.
------------------------

                                  Page 7 of 7                       CONFIDENTIAL

<PAGE>

                                ADDENDUM NUMBER 1
                           TO THE NORTEL NETWORKS INC.
                         GLOBAL PURCHASE AGREEMENT WITH
                       SAVVIS COMMUNICATIONS CORPORATION

THIS ADDENDUM  number 1 ("Addendum 1") is by and between  Nortel  Networks Inc..
("Nortel  Networks")  and  Savvis  Communications  Corporation  ("Company")  and
amended the Global  Purchase  Agreement  between Nortel  Networks and Company of
even date herewith (the "Agreement").

The terms and  conditions of this Addendum 1 specified  below shall apply solely
with respect to Nortel Networks' long haul Optical Products purchased by Company
for installation in the United States or Canada,  and shall take precedence over
any conflicting terms and conditions in the Agreement.

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

1. Add a new  sentence  at the end of Section  4.a (Price  and  Payment)  of the
Agreement as follows:

"Notwithstanding  anything to the contrary,  in all cases where Company utilizes
Financing (as defined herein) for purchase  and/or license of products,  Company
shall pay all charges or such  Products  within ten (10) days after  delivery to
the carrier at Nortel Networks Delivery Location."

2. The parties  understand that Company is seeking Nortel  Networks'  assistance
with  obtaining  financing to pay for purchases  made pursuant to this Agreement
("Financing") in an amount equal to the Optional  Commitment (as defined below).
Nortel Networks agrees that,  solely for the long-haul  Optical Hardware for the
first  eight (8) rings  purchased  for  installation  in the  United  States and
Canadian substantially as listed in Exhibit A attached hereto ("Rings"),  Nortel
Networks  shall pay the  applicable  Financing  interest  charges  for  Hardware
purchased  for each  individual  Ring until the  earlier of 1) Nortel  Networks'
notification to Company that a Ring is ready for service,  or 2) one hundred and
eighty (180) calendar days after delivery of the first unit of Hardware for each
Ring to the Delivery Location.  Thereafter,  Company shall be solely responsible
such Financing interest charges. Notwithstanding the foregoing, Company shall be
responsible  for  all  principle  and  other  costs  and  fees  associated  with
Financing.

3. During the period  beginning  on the  effective  date of this  Agreement  and
ending on December 3,1 2003 (the "Initial  Term"),  Company  shall  purchase and
take  delivery of optical  networks  Products and  Services  listed in Exhibit B
attached hereto  ("Optical  Products and Services") in the net payment amount of
One Hundred and Fifty-Five  Million US dollars  ($155,000,000.00)  (the "Optical
Commitment").

4. In  consideration  of Company's  Optical  Commitment,  Nortel  Networks shall
extend  pricing to  Company as set forth in Exhibit B. In the event the  Company
fails to meet its Optical  Commitment By December 31, 2003, Company shall pay to
Nortel

                                  Page 1 of 5                       CONFIDENTIAL

<PAGE>

Networks, as liquidated damages and not as a penalty, the difference between the
total  prices  paid and the total  list  prices  for the  Optical  Products  and
Services.  Nortel  Networks shall invoice  Company for such  liquidated  damages
promptly after December 31, 2000 (if applicable),  and such invoice shall be due
and payable within thirty (30) days of the date of such invoice.

5. In consideration of the discounts,  terms and conditions  provided to Company
in this Agreement,  Company shall hereby, for the term of this Agreement,  grant
Nortel  Networks  exclusivity  for all Company  optical data product and service
purchases  associated  with Company's data network,  optical  backbone and metro
networks ("Exclusivity Requirement").  However, Nortel Networks may partially or
wholly accept or refuse any Order for such data or optical  products or services
without  liability  of any kind.  Following  any partial or whole  refusal of an
Order,  Company shall be released from this Exclusivity  Requirement solely with
regard to the portion of the Order  refused.  Such release  shall pertain to the
specific  Order (or portion  thereof)  rejected  only and shall not be seen as a
waiver  of this  requirement  for any  future  Orders  of such  data or  optical
products or services.

6. Incentive  Offer: In  consideration  for Company's  Optical  Commitment,  and
subject to Company  achieving the Optical  Commitment amount as set forth above,
during the Initial Term of the Agreement  Nortel  Networks shall provide Company
with the incentives set forth below  ("Incentive  Offer") to be utilized  solely
for Optical  Products  and  Services,  and not for Data  Products (as defined in
Addendum 2 of the Agreement). Each of the following incentives shall be provided
by  Nortel  Networks  at [**]  to  Company based on  the assumption that Company
will meet its Optical  Commitment  during the Initial Term of the Agreement.  In
the event that  Company does not meet its Optical  Commitment  by the end of the
first, or any subsequent, year of the Initial Term, Nortel Networks reserves the
right to modify the Incentive Offer.

6.1 Nortel Networks shall provide a maximum of two (2) sets of spares for active
optical  Hardware  as set forth in  Exhibit C attached  hereto.  One set of such
spares shall be shipped to Company within a reasonable period of time after both
parties  have  signed  this  Addendum,  and the  second  set shall be shipped to
Company  within a reasonable  period of time after its total Optical  Commitment
purchases reach Fifty Million Dollars.

6.2 Nortel Networks shall provide for a period of six (6) months upon receipt of
Company's request, the services of Nortel Networks' Alpharetta,  Georgia Network
Operations Center ("NOC Services") in accordance with Nortel Networks'  standard
procedures.  The request for NOC Services should be submitted to Nortel Networks
at lease one (1) month prior to the requested start date of such NOC Services.

6.3 The Warranty Period for the Optical Hardware set forth in Exhibit A is sixty
(60)  months from the date of delivery  at the  Delivery  Location.  For Optical
Hardware previously purchased from Nortel Networks,  the Warranty Period will be
sixty (60) months from the original ship date.

[**] CONFIDENTIAL TREATMENT REQUESTED

                                  Page 2 of 5                       CONFIDENTIAL

<PAGE>

6.4 Nortel  Networks  shall  provide the services of a Nortel  Networks  program
manager  ("Program  Manager").  The Program  Manager  shall be located at Nortel
Networks  and  shall  act  as  a  point  of  escalation  for  Company's  network
deployment,   including   interfacing  into  Nortel   Networks'   manufacturing,
forecasting,  project management and systems  engineering as necessary,  support
the  integration  of Nortel  Networks'  solutions and  installations,  and other
functions as may be mutually agreed by the parties.

6.5 Nortel  Networks  shall  provide the services of a Nortel  Networks  systems
engineer  ("Systems  Engineer").  The Systems Engineer will be located at Nortel
Networks  and shall assist  company with design of optical,  routing and service
layers, design of broadband network based on current and future access Products,
interface requirements,  implementation plan(s) based on bandwidth requirements,
sensitivity  analysis on bandwidth  growth  rates,  fiber  routing and sizing in
metro and long-haul  networks,  and other functions as may be mutually agreed by
the parties.

6.6  Nortel  Networks  shall  make  training  credits  valued  at $[**]  /credit
("Training  Credit(s)")  available to representatives of Company with respect to
the operation, configuration,  installation, service, maintenance and support of
the optical Products at Nortel Networks' facilities, subject to course and class
availability.  Nortel  Networks  shall,  on the effective date of this Addendum,
provide  Company  [**]  Training  Credits to be used by Company in any of Nortel
Networks'   training  courses  related  to  the  optical  Products  Company  has
purchased.  In  addition,  during  the  Initial  Term,  Company  shall earn [**]
Training Credits for each [**] Dollars [**] of Optical Products it purchases and
takes delivery of pursuant to this Addendum.  The Training  Credits must be used
in the calendar year in which they are earned,  after which time unused Training
Credits will be forfeited. Company shall be responsible for travel, per diem and
other expenses incurred in connection with the attendance of trainees.

6.7 Subject to Sections  6.7.1 and 6.7.2  below,  during the Initial Term and in
accordance with this Section 6.7 Nortel Networks will pay a portion of Company's
marketing  and/or  advertising  invoices  wherein Nortel  Networks  equipment is
featured and/or referenced ("Co-Marketing Funds"), as follows:

6.7.1 Upon the  expiration  of each three (3) month  period  during the  Initial
Term, Nortel Networks will provide  Co-Marketing Funds to Customer equal to [**]
of the net  price of  Optical  Products  purchased/licensed  by and  shipped  to
Company  pursuant to this Addendum  during the preceding three (3) month period.
Any funds  contributed by Nortel Networks  remaining in the Co-Marketing Fund at
expiration or  termination of the Initial Term shall become the sole property of
Nortel Networks.

6.7.2  Company  agrees to use any  Co-Marketing  Funds  provided  to  Company in
accordance with the Nortel Networks' Service Provider and Co-operative Marketing
Program  whereby  Company  agrees  to  co-brand  with the  "Solutions  by Nortel
Networks"

[**] CONFIDENTIAL TREATMENT REQUESTED

                                  Page 3 of 5                       CONFIDENTIAL

<PAGE>

logo in all  marketing  communications  funded by or partially  funded by Nortel
Networks.  For each dollar of approved  charges  incurred by Company  with third
parties for Company's  marketing  and/or  advertising  wherein Nortel  Networks'
Optical Products are featured and/or referenced,  Nortel Networks will reimburse
Company for Company's payment of such eligible third party charge(s),  up to the
amount   remaining  in  company's   Co-Marketing   Fund  account.   In  lieu  of
reimbursement,  for each  dollar  due Nortel  Networks  for the  performance  of
Services by Nortel Networks related to the provision of the  Co-Marketing  Funds
as set forth herein, Nortel Networks may offset such amounts by any Co-Marketing
Funds due and owing to Customer.  As used in this Section 6.7,  "approved" shall
mean  approved in advance and in writing by Nortel  Networks.  The total  amount
that  Nortel  Networks  shall  reimburse  or  otherwise  satisfy  its portion of
eligible charges as described above shall be an amount equal to the lesser of a)
the sum of the Company  payment of the total eligible and approved  expenditures
on approved Programs, or b) the total amount accrued.

7. Company shall,  fifteen (15) days prior to each calender  quarter,  submit to
Nortel  Networks a consolidated  non-binding  forecast of Products by geographic
region, that Company anticipates  purchasing or licensing over the next four (4)
calender  quarters.  In addition to the type,  quantity  and  cumulative  dollar
amount of  Products,  the parties may agree upon  additional  information  to be
included in such forecast.

8. Unless otherwise specified herein, the definitions contained in the Agreement
shall be applicable  to this  Addendum 1. All other terms and  conditions of the
Agreement remain in full force and effect.

9. This Addendum 1, and all obligations of Company hereunder,  is subject to and
conditioned upon satisfaction of each of the following conditions: (i) execution
of  definitive  agreements  relative to the  Financing  on terms and  conditions
satisfactory to Company in its sole and absolute discretion; (ii) acquisition of
Level 3 IRU's for the network  contemplated  in Exhibit A to this  Addendum 1 on
terms  and  conditions   satisfactory  to  Company  in  its  sole  and  absolute
discretion; (iii) possible modification of terms and conditions in this Addendum
1 to the extent such  modification(s)  would not be in direct conflict with that
certain  letter of agreement  (the "LOA") of the parties  dated June 1, 2000 and
last  executed June 2, 2000,  and (iv) approval of Company's  Board of Directors
("Board"),  although  the  parties  acknowledge  and agree that this  matter has
previously been discussed with the Board.  For avoidance of doubt, the Agreement
and

(Remainder of page intentionally left blank)

                                  Page 4 of 5                       CONFIDENTIAL

<PAGE>

this Addendum 1 supercede the LOA.

<TABLE>
<CAPTION>

<S>                                   <C>
SAVVIS COMMUNICATIONS                  NORTEL NETWORKS INC.
CORPORATION                            ("Nortel Networks")
("Company")

By: /s/ Steven M. Gallant             By: /s/ Cynthia C. Hemme
    -----------------------               -------------------------

Name: Steven M. Gallant                Name: Cynthia C. Hemme
     ----------------------                  ----------------------

Title:                                 Title: Vice President & Assistant General Counsel
       VP - General Counsel                   Contracts, Service Provider Solutions - Americas
       --------------------                   ------------------------------------------------

Date:   6/30/00                        Date:       6/30/00
       --------------------                   --------------------

                                                        ----------------------
                                                         APPROVED AS TO FORM
                                                        ----------------------
                                                           LAW DEPARTMENT
                                                         NORTEL NETWORKS INC.
                                                        ----------------------

</TABLE>

                                  Page 5 of 5

<PAGE>
Addendum I, Exhibit A

Global Purchase Agreement between Savvis  Communications  Corporation and Nortel
Networks Inc.

(Exhibit A is attached hereto)

This is Page 1 of 2 pages comprising Exhibit A

Page 2

                      [GRAPHIC OF MAP OF "RINGS" OMITTED]

<PAGE>
Addendum 1, Exhibit B
Global Purchase Agreement between Savvis  Communications  Corporation and Nortel
Networks

ITEM      PRODUCT                                     ITEM         UNIT
 NO.      DESCRIPTION                                 CODE         PRICE
--------------------------------------------------------------------------------
YEAR 1
================================================================================
#1.0      BAY & SHELF HARDWARE
          7 FT. OPTera LH Bay Assembly               NTCA88GA      [**]

          7 FT. OPTERA CONNECT DX BAY ASSEMBLY       NTCA91AB      [**]
           WITH TRIB SHELF

          FIBER MANAGEMENT HARDWARE
          Fiber Management Shelf (2 Trays)           NTCA84GA      [**]
          Fiber Management Hardware Kit              NTCC8414      [**]
          Fiber Highway Kit                          NTCC8849      [**]
          Top Cover Assy                             NTCC8154      [**]

          OC-192 FRAME & MISC. ACCESSORIES
          Frame Accessory KIT  (ANSI)                NTCA89GL      [**]
          ANSI Wasker Kit                            NTRU0412      [**]
          Frame Leveling Kit                         NT7E8040      [**]
          7'0" x 23' Bay Assembly End Guard
          (Left or Right)                            NT7E72AA      [**]
          Installation Materials                     IRM           [**]
          Bay Isolation Kit (IGZ compliance)         NTRU0410      [**]
--------------------------------------------------------------------------------
                                                                        SUBTOTAL
--------------------------------------------------------------------------------
#2.0      OC-192 / LH COMMON EQUIPMENT CARDS
          OPTERA LH CONTROL SHELF COMMON EQUIPMENT   NTZP23AA      [**]
          1 Shelf Controller (32M)                   NTCA41CA      [**]
          1 Message Transfer                         NTCA48AA      [**]
          2 Breaker/Filter Module                    NTCA40BA      [**]

          COMMON EQUIPMENT (CONTROL SHELF)
          External Synchronization Interface         NTCA44AA      [**]
          Shelf Controller (32M)                     NTCA41CA      [**]
          Message Transfer                           NTCA48AA      [**]
          Breaker/Filter Module                      NTCA40BA      [**]

          FILLER CARDS
          Transport Shelf Filler Card (Single Slot)  NTCA49AA      [**]
          Control Shelf Filler Card (1 inch)         NTCA59AA      [**]

          OC-192 SWITCH MODULES
          HDX85 Switch Module (85 Gb/s)              NTCA26AA      [**]

          OPTERA CONNECT DX MAINTENANCE INTERFACE    NTZPxxxx      [**]
          WITH S/W RELEASE 1.0
            1 Maintenance Interface (120 Mb)         NTCA42BA      [**]
            1 OPTera Connect DX Release 1.0          NTCA50GA      [**]
            Superset

          OPTERA LH MAINTENANCE INTERFACE WITH       NTZP17BB      [**]
          S/W RELEASE 1.5
            1 Maintenance Interface (120Mb)          NTCA42BA      [**]
            1 OPTera  LH Release 1.5 Superset COD    NTCA61AE      [**]
--------------------------------------------------------------------------------
                                                                        SUBTOTAL
--------------------------------------------------------------------------------
#3.0      OC-182 TRANSPORT INTERFACES
          OC-192 TRANSMIT INTERFACES - TERMINAL D-WDM-
          UNIVERSAL CONNECTORS
          OC-192 TR (Univ) 1533.47nm DWDM / SR Rx    NTCA06FK      [**]
          OC-192 TR (Univ) 1535.04nm DWDM / SR Rx    NTCA06GK      [**]
          OC-192 TR (Univ) 1555.75nm DWDM / SR Rx    NTCA06XK      [**]
          OC-192 TR (Univ) 1557.36nm DWDM / SR Rx    NTCA06LK      [**]

          OC-192 XR (RETX) OPTICS
          OC-192 XR (Univ) 1533.47nm DWDM / SR Rx    NTCA04FK      [**]
          OC-192 XR (Univ) 1535.04nm DWDM / SR Rx    NTCA04GK      [**]
          OC-192 XR (Univ) 1555.75nm DWDM / SR Rx    NTCA04XK      [**]
          OC-192 XR (Univ) 1557.36nm DWDM / SR Rx    NTCA04LK      [**]
--------------------------------------------------------------------------------
                                                                        SUBTOTAL
--------------------------------------------------------------------------------

[**] CONFIDENTIAL TREATMENT REQUESTED

                                  Page 1 of 4
<PAGE>
Addendum 1, Exhibit B
Global Purchase Agreement between Savvis  Communications  Corporation and Nortel
Networks

--------------------------------------------------------------------------------
#4.0      TRIBUTARY INTERFACES
          OC-48 Interfaces
          OC-48 Tributary Tx/Rx Short Reach          NTCA30CK               [**]
          (1310nm. Univ.)
--------------------------------------------------------------------------------
                                                                        SUBTOTAL
--------------------------------------------------------------------------------
#5.0      DISPERSION COMPENSATION MODULES
          DCM's MOUNTED IN DWDM SHELF
          DCM_60 Module Assembly (SC)                NTCC14CC               [**]
          DCM_100 Module Assembly (SC                NTCC14EC               [**]
--------------------------------------------------------------------------------
                                                                        SUBTOTAL
--------------------------------------------------------------------------------
#6.0      MULTI-WAVELENGTH OPTICAL REPEATER (MOR)
          UNITS
          MOR PLUS WITH MID-STAGE ACCESS (MSA)
          MOR+ W/MSA PreBlue/PostRed (Univ)          NTCA11NK               [**]
          w/15010nm OSC
          MOR+ w/MSA PreRed/PostBlue (Univ)          NTCA11PK               [**]
          w/1510nm OSC
          1625 OPTICAL SERVICE CHANNEL (OSC) UNITS
          1625 Optical Service Channel (SC)          NTCA11CC               [**]
--------------------------------------------------------------------------------
                                                                        SUBTOTAL
--------------------------------------------------------------------------------
#7.0      OPTICAL SERVICE CHANNEL (OSC) WDM UNITS
          OSC 1550 / 1625nm Coupler (SC)             NTCC13AC               [**]
--------------------------------------------------------------------------------
                                                                        SUBTOTAL
--------------------------------------------------------------------------------
#8.0      OPTICAL CONNECTOR KITS (FOR UNIVERSAL CARDS)
          Optical SC Connector Kit                   NTCC99AC               [**]
          (Single Connector)
--------------------------------------------------------------------------------
                                                                        SUBTOTAL
--------------------------------------------------------------------------------
#9.0      DENSE-WDM COUPLER UNITS - MOR PLUS
          DWDM 4 Module Shelf Assy Universal Frame   NTCA88GA               [**]
          (ANSI)
          DWDM Shelf Installation Kit                NTCA88CA               [**]
          100GHZ 8-WAVELENGTH DWDM COUPLERS
          100GHz 8+2w DWDM Coupler MB / DR w/VOA (SC)NTCA10CC               [**]
          100GHz 8+2 DWDM Coupler MR / DB w/VOA (SC) NTCA10DC               [**]
          100GHZ FIXED 2-WAVELENGTH ADD-DROP
          MULTIPLEXER (ADM) COUPLERS
          100GHz DWDM, ADM 1533.47 / 1555.75 (SC     NTCA13AC               [**]
          100GHz DWDM, ADM 1535.04 / 1557.36 (SC)    NTCA13BC               [**]
--------------------------------------------------------------------------------
                                                                        SUBTOTAL
--------------------------------------------------------------------------------
          COMPLETE OPC PACKAGES
          OPTERA CONNECT DX OPC S/W LOAD RELEASE 1.0  NTZPxyyy              [**]
            1 OPC Controller (122M)                   NTCA50BA              [**]
            1 OPC I/O                                 NTCA52AA              [**]
            1 OPC SSD Storage Module                  NTCA51AB              [**]
            1 OPTera Connect DX Release 1.0 Superset  NTCA60GA              [**]
            1 OPC Removable Media (122Mb)             NTCA53BA              [**]
            1 OPTera Connect DX Release 1.0 Superset  NTCA60GA              [**]

          OPTERA LH OPC S/W LOAD RELEASE 1.5          NTZP17AB              [**]
            1 OC-192 OPC Controller (122 M)           NTCA50BA              [**]
            1 OC-192 OPC I/O                          NTCA52AA              [**]
            1 OC-192 OPC Storage Module               NTCA51AA              [**]
            1 OPTera LH Release 1.5 Superset COD      NTCA61AE              [**]
            1 OC-192 OPC Removable Media (122Mb)      NTCA53BA              [**]
            1 OPTera LH Release 1.5 Superset COD      NTCA61AE              [**]

          OPC CABLES (OC-19Z OPC I/O)
          9/25 Pin OC-192 OPC Interface to an         NTCC90HA              [**]
          External Modem (65 ft.
          25/25 Pin OC-192 OPC Interface to an        NTCC80EB              [**]
          External Modem (65 ft.)
--------------------------------------------------------------------------------
                                                                        SUBTOTAL
--------------------------------------------------------------------------------
###       SOFTWARE CERTIFICATES
          OPTera  LH Application - Line               NTCA62DA              [**]
          Amp/Pre/Post/Stand Alone Bay
          OPTera LH Application - Regen/Mus./         NTCA62DB              [**]
          Translators
          OPTDX Application - 4 Fiber BLSR /          NTCA62AD              [**]
          Linear ADM
          OPTDX Feature - Matched Nodes               NTCA62FF              [**]
--------------------------------------------------------------------------------
                                                                        SUBTOTAL
--------------------------------------------------------------------------------
###       DOCUMENTATION
          OC-192 Customer Drawing Package             NTCA79MA              [**]

          OPTera LH Release 1 & 2  CD ROM
          (Covers (Releases                           NTCA64EA              [**]

[**] CONFIDENTIAL TREATMENT REQUESTED

                                  Page 2 of 4
<PAGE>
Addendum 1, Exhibit B
Global  Purchase  Agreement between Savvis Communications Corporation and Nortel
Networks

<TABLE>
<CAPTION>

<S>   <C>                                                        <C>                              <C>
      1.2, 1.5, 2.0)
      OPTera Connect DX NTP Rel 1 (CD ROM)                       NTCA64DA                             [**]

      Advanced Optics Applications, Issue 8                      NTCA66AE                             [**]
----------------------------------------------------------------------------------------------------------
                                                                                                  SUBTOTAL
----------------------------------------------------------------------------------------------------------
 ###  ELECTRICAL CABLING
      ETHERNET CABLES
      Multiple Shelf LAN Cable 20m (66ft) [OC-192 Mt to OC-192   NTC8927                              [**]
      MI)]
      Ethernet cable 20m - OC-192 Mt or OPC to Ethernet LAN      NTCC90BA                             [**]
      USER INTERFACE CABLES & ADAPTORS
      9/25 Pin User Interface Modem Access Cable 20m (66ft)      NTCC8930                             [**]
      25/25 Pin User Interface Modem Access Cable (1 foot)       NTCC90DA                             [**]
      9/25 Pin User Interface Cable (5m)                         NT7E44EA                             [**]
      25/25 - Pin User Interface Cable (5m)                      NT7E44FA                             [**]
      MISCELLANEOUS CABLES
      Power Feed Jumper Kit 4 #4 AWG Cables                      NTCA89GE                             [**]
      Anti-Static Wrist Strap (NPS50332-01L3)                    AO336175                             [**]
----------------------------------------------------------------------------------------------------------
                                                                                                  SUBTOTAL
----------------------------------------------------------------------------------------------------------
 ###  OPTICAL PATCHCORDS
      TUNED PATCHCORDS
      SM Optical Patchcord 5m (SC-turned)                        NT7E46HA                             [**]
----------------------------------------------------------------------------------------------------------
                                                                                                  SUBTOTAL
----------------------------------------------------------------------------------------------------------
                                                                                 Equipment Subtotal Year 1
----------------------------------------------------------------------------------------------------------
----------------------------------------------------------------------------------------------------------
                                                                                              E&I Services
----------------------------------------------------------------------------------------------------------
                                                                                           Preside Network
                                                                                                Management
----------------------------------------------------------------------------------------------------------
                                                                                           SUBTOTAL YEAR 1
----------------------------------------------------------------------------------------------------------
              YEAR 2
----------------------------------------------------------------------------------------------------------
#1.0  TRIBUTARY INTERFACES
      OC-48 Interfaces
      OC-48 Tributary Tx/Rx Short Reach (1310nm, Univ.)          NTCA30CK                             [**]
----------------------------------------------------------------------------------------------------------
                                                                                                  SUBTOTAL
----------------------------------------------------------------------------------------------------------
#2.0  OPTICAL CONNECTOR KITS (FOR UNIVERSAL CARDS)
      Optical SC Connector Kit (Single Connector)                NTCC99AC                             [**]
----------------------------------------------------------------------------------------------------------
                                                                                                  SUBTOTAL
----------------------------------------------------------------------------------------------------------
#3.0  SOFTWARE CERTIFICATES
      OPTDX Feature - Rel. 2.0 Software Upgrade                  NTCA62xx                             [**]
----------------------------------------------------------------------------------------------------------
                                                                                                  SUBTOTAL
----------------------------------------------------------------------------------------------------------
#4.0  DOCUMENTATION
      OPTera Connect DX NTP Rel 2 (CD ROM)                       NTCA64xx                             [**]
----------------------------------------------------------------------------------------------------------
                                                                                                  SUBTOTAL
----------------------------------------------------------------------------------------------------------
#5.0  OPTICAL PATCHCORDS
      TUNED PATCHCORDS
      SM Optical Patchcord 5m (SC-tuned)                         NT7E46HA                             [**]
----------------------------------------------------------------------------------------------------------
                                                                                                  SUBTOTAL
----------------------------------------------------------------------------------------------------------
                                                                                 Equipment Subtotal Year 2
----------------------------------------------------------------------------------------------------------

----------------------------------------------------------------------------------------------------------
                                                                                              E&I Services
----------------------------------------------------------------------------------------------------------
                                                                                           Preside Network
                                                                                                Management
----------------------------------------------------------------------------------------------------------
                                                                                           SUBTOTAL YEAR 2
----------------------------------------------------------------------------------------------------------
           YEAR 3
----------------------------------------------------------------------------------------------------------
#1.0   BAY & SHELF HARDWARE
       7 FT, OPTera Connect DX Bay Assembly with Trib Shelf       NTCA91AB                            [**]
----------------------------------------------------------------------------------------------------------
                                                                                                  SUBTOTAL
----------------------------------------------------------------------------------------------------------
#2.0   OC-192 / LH COMMON EQUIPMENT CARDS
       OC-192 SWITCH MODULES
       HDX140 Switch Module (120 Gb/s)                            NTCA26CA                            [**]
----------------------------------------------------------------------------------------------------------
                                                                                                  SUBTOTAL
----------------------------------------------------------------------------------------------------------
#3.0   OC-192 TRANSPORT INTERFACES
       OC-192 TRANSMIT INTERFACES - TERMINAL D-WDM - UNIVERSAL
       CONNECTORS

</TABLE>

[**] CONFIDENTIAL TREATMENT REQUESTED

                                  Page 3 of 4

<PAGE>
Addendum 1, Exhibit B
Global Purchase Agreement between Savvis Communications Corporation and Nortel
Networks

<TABLE>
<CAPTION>

<S>   <C>                                                        <C>                              <C>

       OC-192 TR (Univ) 1533.47nm DWDM / SR Rx                    NTCA06FK                            [**]
       OC-192 TR (Univ) 1535.04nm DWDM / SR Rx                    NTCA06GK                            [**]
       OC-192 TR (Univ) 1555.75nm DWDM / SR Rx                    NTCA06XK                            [**]
       OC-192 TR (Univ) 1557.36nm DWDM / SR Rx                    NTCA06LK                            [**]

       OC-192XR (RETX) OPTICS
       OC-192 XR (Univ) 1533.47nm DWDM / SR Rx                    NTCA04FK                            [**]
       OC-192 XR (Univ) 1535.04nm DWDM / SR Rx                    NTCA04GK                            [**]
       OC-192 XR (Univ) 1555.75nm DWDM / SR Rx                    NTCA04XK                            [**]
       OC-192 XR (Univ) 1557.36nm DWDM / SR Rx                    NTCA04LK                            [**]
----------------------------------------------------------------------------------------------------------
                                                                                                  SUBTOTAL
----------------------------------------------------------------------------------------------------------
#4.0   TRIBUTARY INTERFACES
       OC-48 INTERFACES
       OC-48 Tributary Tx/Rx Short Reach (1310nm. Univ.)          NTCA30CK                            [**]
----------------------------------------------------------------------------------------------------------
                                                                                                  SUBTOTAL
----------------------------------------------------------------------------------------------------------
#5.0   OPTICAL SERVICE CHANNEL (OSC) WDM UNITS
       OSC 1550 / 1625 nm Coupler (SC)                            NTCC13AC                            [**]
----------------------------------------------------------------------------------------------------------
                                                                                                  SUBTOTAL
----------------------------------------------------------------------------------------------------------
#6.0   OPTICAL CONNECTOR KITS (FOR UNIVERSAL CARDS)
       Optical SC Connector Kit (Single Connector)                NTCC99AC                            [**]
----------------------------------------------------------------------------------------------------------
                                                                                                  SUBTOTAL
----------------------------------------------------------------------------------------------------------
#7.0   DENSE-WDM COUPLER UNITS - MOR PLUS
       100GHz 8-WAVELENGTH DWDM COUPLERS
       100 GHz 8+2w DWDM Coupler MB / DR w/VOA (SC)               NTCA10CC                            [**]
       100GHz 8+2 DWDM Coupler MR / DR w/VOA (SC)                 NTCA10DC                            [**]
----------------------------------------------------------------------------------------------------------
                                                                                                  SUBTOTAL
----------------------------------------------------------------------------------------------------------
#8.0   SOFTWARE CERTIFICATES
       Software upgrade feature                                   NTCA62FJ                            [**]
       OPTDX Feature - Rel 3.0 Software Upgrade                   NTCA62FJ                            [**]
----------------------------------------------------------------------------------------------------------
                                                                                                  SUBTOTAL
----------------------------------------------------------------------------------------------------------
#9.0   DOCUMENTATION
       OPTera LH CD ROM                                           NTCA64EA                            [**]
       OPTera Connect DX NTP Rel 3 (CD ROM)                       NTCA64DA                            [**]
----------------------------------------------------------------------------------------------------------
                                                                                                  SUBTOTAL
----------------------------------------------------------------------------------------------------------
###    OPTICAL PATCHCORDS
       TUNED PATCHCORDS
       SM Optical Patchcord 5m (SC-tuned)                         NT7E46HA                            [**]
----------------------------------------------------------------------------------------------------------
                                                                                                  SUBTOTAL
----------------------------------------------------------------------------------------------------------
                                                                                 Equipment Subtotal Year 3
----------------------------------------------------------------------------------------------------------
                                                                                                  SUBTOTAL
----------------------------------------------------------------------------------------------------------

----------------------------------------------------------------------------------------------------------
                                                                                              E&I Services
----------------------------------------------------------------------------------------------------------
                                                                                           Preside Network
                                                                                                Management
----------------------------------------------------------------------------------------------------------
                                                                                           SUBTOTAL YEAR 3
----------------------------------------------------------------------------------------------------------

[**] CONFIDENTIAL TREATMENT REQUESTED

</TABLE>
                                  Page 4 of 4

<PAGE>

Addendum 1, Exhibit C
Global Purchase Agreement between Savvis Communications Corporation
and Nortel Networks Inc.

                                                                 Nortel Networks
                                                   S/DMS TransportNode Equipment

<TABLE>
<CAPTION>
-----------------------------------------------------------------------------------------------------------------------------------
                                                                                       SPARE PARTS              TOTAL PRICE
-----------------------------------------------------------------------------------------------------------------------------------
                                                                                       One Set of Recommended    TOTAL GIVEN FOR
                                                                                       Spare Parts              2 SETS OF SPARES
-----------------------------------------------------------------------------------------------------------------------------------
   ITEM   PRODUCT                                               ITEM           UNIT                   EXTENDED          EXTENDED
   NO.    DESCRIPTION                                           CODE           PRICE    QTY              PRICE    QTY      PRICE
-----------------------------------------------------------------------------------------------------------------------------------
<S>      <C>                                                   <C>            <C>      <C>            <C>         <C>     <C>
-----------------------------------------------------------------------------------------------------------------------------------
   #1.0   OC-192 / LH COMMON EQUIPMENT CARDS
          OPTERA LH CONTROL SHELF COMMON EQUIPMENT              NTZP23AA        [**]      1               [**]      2       [**]
             1  Shelf Controller (32M)                          NTCA41CA        [**]
             1  Message Transfer                                NTCA48AA        [**]
             2  Breaker/Filter Module                           NTCA40BA        [**]

          COMMON EQUIPMENT (CONTROL SHELF)
          External Synchronization Interface                    NTCA44AA        [**]      1               [**]      2       [**]
          Shelf Controller (32M)                                NTCA41CA        [**]      1               [**]      2       [**]
          Message Transfer                                      NTCA48AA        [**]      1               [**]      2       [**]
          Breaker/Filter Module                                 NTCA40BA        [**]      1               [**]      2       [**]

          OC-192 SWITCH MODULES
          HDX65 Switch Module (65 Gb/s)                         NTCA26AA        [**]      1               [**]      2       [**]

             1  Maintenance Interface (120Mb)                   NTCA42XX        [**]      1               [**]      2       [**]

             1  Maintenance Interface (120Mb)                   NTCA42BA        [**]      1               [**]      2       [**]
-----------------------------------------------------------------------------------------------------------------------------------
                                                                            SUBTOTAL                      [**]              [**]
-----------------------------------------------------------------------------------------------------------------------------------
   #2.0   OC-192 TRANSPORT INTERFACES
          OC-192 TRANSMIT INTERFACES - TERMINAL
            D-WDM - UNIVERSAL CONNECTORS
          OC-192 TR (Univ) 1533.47nm DWDM / SR Rx               NTCA06FK        [**]      2               [**]      4       [**]
          OC-192 TR (Univ) 1535.04nm DWDM / SR Rx               NTCA06GK        [**]      2               [**]      4       [**]
          OC-192 TR (Univ) 1555.75nm DWDM / SR Rx               NTCA06XK        [**]      2               [**]      4       [**]
          OC-192 TR (Univ) 1557.36nm DWDM / SR Rx               NTCA06LK        [**]      2               [**]      4       [**]

          OC-192 XR (RETX) OPTICS
          OC-192 XR (Univ) 1533.47nm DWDM / SR Rx               NTCA04FK        [**]      2               [**]      4       [**]
          OC-192 XR (Univ) 1535.04nm DWDM / SR Rx               NTCA04GK        [**]      2               [**]      4       [**]
          OC-192 XR (Univ) 1555.75nm DWDM / SR Rx               NTCA04XK        [**]      2               [**]      4       [**]
          OC-192 XR (Univ) 1557.36nm DWDM / SR Rx               NTCA04LK        [**]      2               [**]      4       [**]
-----------------------------------------------------------------------------------------------------------------------------------
                                                                            SUBTOTAL                      [**]              [**]
-----------------------------------------------------------------------------------------------------------------------------------
   #3.0   TRIBUTARY INTERFACES
           OC-48 INTERFACES
           OC-48 Tributary Tx/Rx Short Reach (1310nm, Univ.     NTCA30CK        [**]      1               [**]      2       [**]
-----------------------------------------------------------------------------------------------------------------------------------
                                                                            SUBTOTAL                      [**]              [**]
-----------------------------------------------------------------------------------------------------------------------------------
   #4.0   DISPERSION COMPENSATION MODULES
           DCM'S MOUNTED IN DWDM SHELF
           DCM_60 Module Assembly (SC)                          NTCC14CC        [**]      1               [**]      2       [**]
           DCM_100 Module Assembly (SC)                         NTCC14EC        [**]      1               [**]      2       [**]
-----------------------------------------------------------------------------------------------------------------------------------
                                                                            SUBTOTAL                      [**]              [**]
-----------------------------------------------------------------------------------------------------------------------------------
   #5.0   MULTI-WAVELENGTH OPTICAL REPEATER (MOR) UNITS
          MOR PLUS WITH MID-STAGE ACCESS (MSA)
          MOR+ w/MSA PreBlue/PostRed (Univ) w/1510nm OSC        NTCA11NK        [**]      1               [**]      2       [**]
          MOR+ w/MSA PreRed / PostBlue (Univ) w/1510nm OSC      NTCA11PK        [**]      1               [**]      2       [**]
          1625 OPTICAL SERVICE CHANNEL (OSC) UNITS
          1625 Optical Service Channel (SC)                     NTCA11CC        [**]      1               [**]      2       [**]
-----------------------------------------------------------------------------------------------------------------------------------
                                                                            SUBTOTAL                      [**]              [**]
-----------------------------------------------------------------------------------------------------------------------------------
   #6.0   OPTICAL SERVICE CHANNEL (OSC) WDM UNITS
          OSC 1550 / 1625nm Coupler (SC)                        NTCC13AC        [**]      1               [**]      2       [**]
-----------------------------------------------------------------------------------------------------------------------------------
                                                                            SUBTOTAL                      [**]              [**]
-----------------------------------------------------------------------------------------------------------------------------------
   #7.0   OPTICAL CONNECTOR KITS (FOR UNIVERSAL CARDS)
          Optical SC Connector Kit (Single Connector)           NTCC99AC        [**]      42              [**]      84      [**]
-----------------------------------------------------------------------------------------------------------------------------------
                                                                            SUBTOTAL                      [**]              [**]
-----------------------------------------------------------------------------------------------------------------------------------
   #8.0   100GHZ 8-WAVELENGTH DWDM COUPLERS
          100GHz 8+2w DWDM Coupler MB / DR w/VOA (SC)           NTCA10CC        [**]      1               [**]      2       [**]
          100GHz 8+2 DWDM Coupler MR / DB w/VOA (SC)            NTCA10DC        [**]      1               [**]      2       [**]
          100GHZ FIXED 2-WAVELENGTH ADD-DROP MULTIPLEXER
           (ADM) COUPLERS
          100GHz DWDM, ADM 1533.47 / 1555.75 (SC)               NTCA13AC        [**]      1               [**]      2       [**]
          100GHz DWDM, ADM 1535.04 / 1557.36 (SC)               NTCA13BC        [**]      1               [**]      2       [**]
-----------------------------------------------------------------------------------------------------------------------------------
                                                                            SUBTOTAL                      [**]              [**]
-----------------------------------------------------------------------------------------------------------------------------------

-----------------------------------------------------------------------------------------------------------------------------------
</TABLE>

                     [**] CONFIDENTIAL TREATMENT REQUESTED
                                  Page 1 0f 1
<PAGE>

                              NORTEL NETWORKS INC.
                           GLOBAL PURCHASE AGREEMENT
                               ADDENDUM NUMBER 2
                           SUPPLEMENTAL DOCUMENTATION

1. DATA PRODUCTS

The following products are covered by this Supplemental Documentation:

Etherloop,  Internet Call Waiting,  Voice Button, CVX 1800, SS7 Gateway,  Nortel
Networks'  Enterprise  Solutions  Products (Product Price Groups A, B, C, E, and
F), and Shasta Products.

The  supplemental  terms and conditions  provided below take precedence over any
conflicting terms and conditions specified in the articles and/or sections noted
below or elsewhere in the Agreement,  as such terms and conditions  apply to the
data products identified above (collectively, "Data Products").

Article 3, Section a)

With respect to Orders for  Enterprise  Solutions  Data Products for shipment to
Company locations outside the United States,  such Orders shall be placed either
on a  Nortel  Networks  Affiliate  or a Nortel  Networks  value  added  reseller
("VAR"),  as  provided  in  Attachment  1 to this  Addendum  No. 2 and as may be
specified by Nortel Networks.

Article 4, Section a)

The  price  for  Enterprise  Solutions  Data  Products  shall be  determined  in
accordance with Attachment 1 to this Addendum No. 2.

Notwithstanding  anything to the contrary,  in all cases where Company  utilizes
Financing for purchase of Data Products,  Company shall pay all charges for such
Products  within ten (10) days after delivery to the carrier at Nortel  Networks
Delivery Location.

Article 6, Section a)

With regard to the subject of Software license, the following shall apply:

   Where use of a  Product  requires  the  download  of  Software  to  Company's
   Companys,  Company shall be responsible  for insuring that the Company agrees
   to terms no less restrictive than those contained to this Article 6.

Article 8, Section a)

With regard to the subject of acceptance, the following shall apply:

   Data Products shall be deemed accepted upon the ship date.

Article 9, Section a)

With  regard  to the  subject  of  reinstatement  of  warranty  after  breach of
warranty, the following shall apply:

   The repair or replacement of the defective  component,  the correction of the
   Software or the redoing of any installation

   (Remainder of page intentionally left blank)

<PAGE>

Services shall not extend the applicable Warranty Period.

<TABLE>
<CAPTION>

<S>                                   <C>
SAVVIS COMMUNICATIONS                  NORTEL NETWORKS INC.
CORPORATION                            ("Nortel Networks")
("Company")

By: /s/ Steven M. Gallant             By: /s/ Cynthia C. Hemme
    -----------------------               -------------------------

Name: Steven M. Gallant                Name: Cynthia C. Hemme
     ----------------------                  ----------------------

Title:                                 Title: Vice President & Assistant General Counsel
       VP - General Counsel                   Contracts, Service Provider Solutions - Americas
       --------------------                   ------------------------------------------------

Date:   6/30/00                        Date:       6/30/00
       --------------------                   --------------------

</TABLE>

(Remainder of page intentionally left blank)







                                                        ----------------------
                                                         APPROVED AS TO FORM
                                                        ----------------------
                                                           LAW DEPARTMENT
                                                         NORTEL NETWORKS INC.
                                                        ----------------------

                                       2

<PAGE>

ADDENDUM NO. 2

                                  Attachment 1
                      Global Ordering Procedures and Price
                       Enterprise Solutions Data Products

1. GLOBAL  ORDERING  PROCEDURES FOR ENTERPRISE  SOLUTIONS DATA PRODUCTS GROUPS A
   THROUGH F
A. ORDERS FOR DELIVERY OR PERFORMANCE IN THE U.S. Orders for data Products Group
   A, B,  C, E and F to be  delivered  or  installed  in the  U.S.  and  related
   Services  to be  performed  in the U.S.  shall be issued by Company to Nortel
   Networks.
B. ORDERS FOR DELIVERY OR PERFORMANCE  OUTSIDE THE U.S. Orders for data Products
   Group A, B, C, E and F to be  delivered  or  installed  outside the U.S.  and
   related Services to be performed  outside the U.S. shall be issued by Company
   in the country of delivery or  performance at its option either to (i) Nortel
   Networks under the Global Delivery Service option; or (ii) the VAR identified
   as a Nortel Networks "Global Business Partner" for the country of delivery or
   performance  under the Global Partner Service  option.  If Company issues the
   order  to a VAR  pursuant  to the  Global  Partner  Service  option,  Company
   acknowledges  that Nortel  Networks shall have the right to assign the rights
   and duties under this Agreement  necessary to perform such order to such VAR,
   including  without  limitation,  acceptance of the order,  performance of the
   order,  invoicing and collection of the price of the order and performance of
   warranty Services for Products in the order. Each such Global Partner Service
   option order shall continue to be governed by the terms of this Agreement and
   all  obligations  of this  Agreement  not  assigned  to the VAR shall  remain
   obligations of Nortel  Networks.  To ensure that Company receives the benefit
   of the prices and discounts in this Agreement when Company issues an order to
   a VAR under the Global Partner  Service  option,  Company shall (a) reference
   this  Agreement by including the  Agreement  number on the face of the order.
   (b)  identify  on the face of the order any  Special  Business  Authorization
   ("SBA")  number(s)  which  may  be  provided  by  Nortel  Networks,  and  (c)
   simultaneously furnish a copy of the order and certain international ordering
   information in a format specified by Nortel Networks to its designated Nortel
   Networks account representative.
C. LIMITED  DURATION.  The ordering  processes  within  Nortel  Networks and its
   affiliates  for data  Products  Groups A through  and F are  under  review to
   permit the  ordering  of such  Products  in  accordance  with the  procedures
   described  in Section 2 of this  Attachment  1. When such  process  review is
   completed,  Nortel  Networks  will  notify  Company  and upon such notice the
   ordering procedures in Section 2 of this Attachment 1 will also apply to data
   Products Groups A through F.

2. PRICING
   The pricing for each  Enterprise  Solutions Data Product shall be as follows:
A. DATA PRODUCTS GROUPS A THROUGH F PRICE LIST. The Price List for data Products
   Groups A, B, C, E and F and related Services (data Products Group D) shall be
   Nortel  Networks'  then-current  published  standard U.S. Price List for such
   Products and  Services in effect at time of order,  as such Price List may be
   changed by Nortel  Networks  from time to time.  For  purchases  for delivery
   outside  the  U.S.,  the  prices  in such  Price  List  shall be  subject  to
   adjustment   using  the  applicable   band  multiplier  for  the  country  of
   destination  specified in Table 1 below.  Such adjustment will be made before
   the volume discount identified in Section 4 below is applied. Nortel Networks
   reserves the right to move a particular  country  into a different  band,  or
   change the multiplier within a band as a result of changes which may occur in
   duties,  destination  charges and the like.  The prices for Bands 2 through 6
   countries  only,  determined  using  the  applicable  multiplier  in Table 1,
   include  freight,  insurance,  import  fees,  duties  and  customs  clearance
   charges, but do not include any applicable  in-country taxes (including sales
   tax and  value  added  tax)  which  shall be  Company's  responsibility.  The
   Services  offered in association  with data Products  Groups A, B, C, E and F
   under the Agreement shall be in accordance with the Services  Descriptions in
   effect on the date Nortel Networks accepts an order for such Services.

(Remainder of page intentionally left blank)

                                       3

<PAGE>

                                    TABLE 1
        COUNTRY PRICE BANDS MATRIX FOR DATA PRODUCTS GROUPS A THROUGH F

--------------------------------------------------------------------------------
    BAND
--------------------------------------------------------------------------------
   Band 1      [**]        United States
--------------------------------------------------------------------------------
   Band 2      [**]        Canada
--------------------------------------------------------------------------------
   Band 3      [**]        Australia, Austria, Belgium, Czech Republic, Denmark,
                           Egypt, Finland,  France, Germany, Hong Kong, Hungary,
                           Ireland,    Israel,    Italy,   Japan,    Luxembourg,
                           Netherlands,  New Zealand,  Norway, Poland, Portugal,
                           Russia,  Saudi  Arabia,  Singapore,  Slovakia,  South
                           Africa, Spain, Sweden, Switzerland,  Thailand, United
                           Arab Emirates, United Kingdom
--------------------------------------------------------------------------------
   Band 4      [**]        Argentina, Belize, Bulivia, Chile,  Colombia,   Costa
                           Rica,  Ecuador,  El  Salvador,   Greece,   Guatemala,
                           Honduras,   Indonesia,   Kenya,   Malaysia,   Mexico,
                           Morocco,  Nicaragua,  Panama,  Paraguay,  Peru, South
                           Korea, Taiwan, Tunisia, Turkey, Uruguay, Venezuela
--------------------------------------------------------------------------------
   Band 5      [**]        Brazil, People's  Republic  of  China,  Phillippines,
                           Sri Lanka (GPS Only)
--------------------------------------------------------------------------------
   Band 6      [**]        India
--------------------------------------------------------------------------------

3. DISCOUNTS

   The following volume discount schedule applies to purchase of Products and of
   Services (for Enterprise Solutions Data Products only) under this Agreement:

<TABLE>
<CAPTION>


   PRODUCT GROUP                                       HARDWARE/SOFTWARE DISCOUNT PERCENTAGE(S)
   -------------                                       ----------------------------------------
<S>                                                     <C>

   DATA PRODUCTS GROUP A                                                [**]
   DATA PRODUCTS GROUP B                                                [**]
   DATA PRODUCTS GROUP C                                                [**]
   DATA PRODUCTS GROUP D (SERVICES FOR DATA PRODUCTS)                   [**]
   DATA PRODUCTS GROUP E                                                [**]
   DATA PRODUCTS GROUP F                                                [**]

</TABLE>

4. The parties  acknowledge  that the  purchase  orders  specified  in Exhibit A
   attached  hereto shall be subject  solely to the terms and conditions of this
   Agreement.  Notwithstanding  Section  4 of  the  Agreement,  payment  of  the
   purchase  orders  listed in Exhibit A hereto shall be made from the financing
   closing on or about the  Effective  Date and Company  shall not be subject to
   interest payments with respect thereto.

5. Nortel Networks represents and warrants that the Shasta 500 BSN Data Products
   have  received  a  regulatory  approval  as  described  in Exhibit B attached
   hereto.  Nortel  further  represents  that it is  seeking  type  approval  in
   Singapore and Hong Kong and Nortel  Networks  understands  that approval   in
   such  countries is important  to Company.  In the event type  approval is not
   received in any of the  jurisdictions  as set forth in Exhibit B, the parties
   agree to  negotiate  in good  faith a  mutually  acceptable  course of action
   reasonably designed to address the applicable delay.

(Remainder of page intentionally left blank)

[**] CONFIDENTIAL TREATMENT REQUESTED

                                       4
<PAGE>

Addendum 2, Attachment 1, Exhibit A
Global Purchase Agreement between Savvis  Communications  Corporation and Nortel
Networks


Purchase order list:

<TABLE>
<CAPTION>
CUSTOMER PO NUMBER              SHIPTO CUSTOMER NAME                                        SUM INVOICE NET PRICE
<S>                             <C>                                                                          <C>
4500000246                      BRIDGE INFORMATION SYSTEMS AMERICA                                           [**]
BIA104426                       BRIDGE INFORMATION SYSTEMS AMERICA                                           [**]
BIA104427                       BRIDGE INFORMATION SYSTEMS AMERICA                                           [**]
BIA104752                       BRIDGE INFORMATION SYSTEMS AMERICA                                           [**]
BIA107152                       BRIDGE INFORMATION SYSTEMS AMERICA                                           [**]
                                BRIDGE INFORMATION SYSTEMS AMERICA                                           [**]
21-0001056330                   BRIDGE INFORMATION SYSTEMS AMERICA,                                          [**]
4500000109                      BRIDGE INFORMATION SYSTEMS AMERICA,                                          [**]
4500000139                      BRIDGE INFORMATION SYSTEMS AMERICA,                                          [**]
4500000140                      BRIDGE INFORMATION SYSTEMS AMERICA,                                          [**]
4500000284                      BRIDGE INFORMATION SYSTEMS AMERICA,                                          [**]
4500000536                      BRIDGE INFORMATION SYSTEMS AMERICA,                                          [**]
4500000539                      BRIDGE INFORMATION SYSTEMS AMERICA,                                          [**]
4500000561                      BRIDGE INFORMATION SYSTEMS AMERICA,                                          [**]
4500000638                      BRIDGE INFORMATION SYSTEMS AMERICA,                                          [**]
4500000765                      BRIDGE INFORMATION SYSTEMS AMERICA,                                          [**]
BIA105489                       BRIDGE INFORMATION SYSTEMS AMERICA,                                          [**]
BIA105632                       BRIDGE INFORMATION SYSTEMS AMERICA,                                          [**]
BIA105662                       BRIDGE INFORMATION SYSTEMS AMERICA,                                          [**]
BIA105763                       BRIDGE INFORMATION SYSTEMS AMERICA,                                          [**]
BIA105765                       BRIDGE INFORMATION SYSTEMS AMERICA,                                          [**]
BIA105768                       BRIDGE INFORMATION SYSTEMS AMERICA,                                          [**]
BIA105770                       BRIDGE INFORMATION SYSTEMS AMERICA,                                          [**]
BIA105892                       BRIDGE INFORMATION SYSTEMS AMERICA,                                          [**]
BIA105896                       BRIDGE INFORMATION SYSTEMS AMERICA,                                          [**]
BIA105903                       BRIDGE INFORMATION SYSTEMS AMERICA,                                          [**]
BIA105936                       BRIDGE INFORMATION SYSTEMS AMERICA,                                          [**]
BIA105940                       BRIDGE INFORMATION SYSTEMS AMERICA,                                          [**]
BIA105942                       BRIDGE INFORMATION SYSTEMS AMERICA,                                          [**]
BIA105943                       BRIDGE INFORMATION SYSTEMS AMERICA,                                          [**]
BIA105949                       BRIDGE INFORMATION SYSTEMS AMERICA,                                          [**]
BIA105950                       BRIDGE INFORMATION SYSTEMS AMERICA,                                          [**]
BIA105951                       BRIDGE INFORMATION SYSTEMS AMERICA,                                          [**]
BIA106064                       BRIDGE INFORMATION SYSTEMS AMERICA,                                          [**]
BIA106190                       BRIDGE INFORMATION SYSTEMS AMERICA,                                          [**]
BIA106191                       BRIDGE INFORMATION SYSTEMS AMERICA,                                          [**]
BIA106194                       BRIDGE INFORMATION SYSTEMS AMERICA,                                          [**]
BIA106294                       BRIDGE INFORMATION SYSTEMS AMERICA,                                          [**]
BIA106657                       BRIDGE INFORMATION SYSTEMS AMERICA,                                          [**]
BIA106945                       BRIDGE INFORMATION SYSTEMS AMERICA,                                          [**]
BIA107072                       BRIDGE INFORMATION SYSTEMS AMERICA,                                          [**]
BIA107235                       BRIDGE INFORMATION SYSTEMS AMERICA,                                          [**]
BIA107239                       BRIDGE INFORMATION SYSTEMS AMERICA,                                          [**]
BIA107277                       BRIDGE INFORMATION SYSTEMS AMERICA,                                          [**]
BIA107278                       BRIDGE INFORMATION SYSTEMS AMERICA,                                          [**]
</TABLE>

                                   Page 1 of 2

<PAGE>

Addendum 2, Attachment 1, Exhibit A
Global Purchase Agreement between Savvis  Communications  Corporation and Nortel
Networks

<TABLE>
<S>                             <C>                                                                          <C>
BIA107730                       BRIDGE INFORMATION SYSTEMS AMERICA,                                          [**]
BIA107730                       BRIDGE INFORMATION SYSTEMS AMERICA,                                          [**]
BIA107735                       BRIDGE INFORMATION SYSTEMS AMERICA,                                          [**]
BIA107811                       BRIDGE INFORMATION SYSTEMS AMERICA,                                          [**]
BIA107906                       BRIDGE INFORMATION SYSTEMS AMERICA,                                          [**]
BIA107944                       BRIDGE INFORMATION SYSTEMS AMERICA,                                          [**]
BIA107946                       BRIDGE INFORMATION SYSTEMS AMERICA,                                          [**]
BIA108004                       BRIDGE INFORMATION SYSTEMS AMERICA,                                          [**]
BIA108023                       BRIDGE INFORMATION SYSTEMS AMERICA,                                          [**]
BIA108289                       BRIDGE INFORMATION SYSTEMS AMERICA,                                          [**]
BIA108300                       BRIDGE INFORMATION SYSTEMS AMERICA,                                          [**]
BIA108362                       BRIDGE INFORMATION SYSTEMS AMERICA,                                          [**]
BIA108413                       BRIDGE INFORMATION SYSTEMS AMERICA,                                          [**]
SVS700004                       BRIDGE INFORMATION SYSTEMS AMERICA,                                          [**]
SVS700016                       BRIDGE INFORMATION SYSTEMS AMERICA,                                          [**]
SVS700017                       BRIDGE INFORMATION SYSTEMS AMERICA,                                          [**]
SVS700018                       BRIDGE INFORMATION SYSTEMS AMERICA,                                          [**]
SVS700019                       BRIDGE INFORMATION SYSTEMS AMERICA,                                          [**]
SVS700020                       BRIDGE INFORMATION SYSTEMS AMERICA,                                          [**]
SVS700035                       BRIDGE INFORMATION SYSTEMS AMERICA,                                          [**]
SVS700039                       BRIDGE INFORMATION SYSTEMS AMERICA,                                          [**]
SVS700039                       BRIDGE INFORMATION SYSTEMS AMERICA,                                          [**]
SVS700049                       BRIDGE INFORMATION SYSTEMS AMERICA,                                          [**]
SVS700049                       BRIDGE INFORMATION SYSTEMS AMERICA,                                          [**]
SVS700055                       BRIDGE INFORMATION SYSTEMS AMERICA,                                          [**]
SVS700060                       BRIDGE INFORMATION SYSTEMS AMERICA,                                          [**]
SVS700067                       BRIDGE INFORMATION SYSTEMS AMERICA,                                          [**]
SVS700070                       BRIDGE INFORMATION SYSTEMS AMERICA,                                          [**]
SVS700070                       BRIDGE INFORMATION SYSTEMS AMERICA,                                          [**]
SVS700076                       BRIDGE INFORMATION SYSTEMS AMERICA,                                          [**]
SVS700076                       BRIDGE INFORMATION SYSTEMS AMERICA,                                          [**]
SVS700082                       BRIDGE INFORMATION SYSTEMS AMERICA,                                          [**]
SVS700083                       BRIDGE INFORMATION SYSTEMS AMERICA,                                          [**]
SVS700084                       BRIDGE INFORMATION SYSTEMS AMERICA,                                          [**]
SVS700086                       BRIDGE INFORMATION SYSTEMS AMERICA,                                          [**]
                                BRIDGE INFORMATION SYSTEMS AMERICA,                                          [**]
BIA103986                       BRIDGE INFORMATION SYSTEMS INC                                               [**]
BIA103989                       BRIDGE INFORMATION SYSTEMS INC                                               [**]
M19670                          BRIDGE INORMATION SYSTEMS                                                    [**]
4500000273                      Video Equipment                                                              [**]
4500000171                      CVX                                                                          [**]
SVS700097                       Shasta Equipemtn                                                             [**]
PO# to Sprint???                CVX Hardware                                                                 [**]
PO# 1972 to Juniper             Juniper                                                                      [**]
PO# 1974 to Juniper             Juniper                                                                      [**]
PO# 1972-A to Juniper           Juniper                                                                      [**]
Pending Maintenance PO          Annual Maintenance for Nortel ES products                                    [**]
                                                                                                             [**]

<FN>
[**] CONFIDENTIAL TREATMENT REQUESTED
</FN>
</TABLE>

                                   Page 2 of 2

<PAGE>

Addendum 2, Attachment 1, Exhibit B
Global Purchase Agreement between Savvis  Communications  Corporation and Nortel
Networks

Shasta  5000 BSN  regulatory  approval  for  shipment  and  utilization  for the
following countries as described below:

NORTH AMERICA
-------------
Canada (all locations)
USA (all locations)

EUROPE
------
The Shasta 5000 BSN can be shipped and used in any country  that  accepts the CE
regulatory  approval.  Namely the following  countries accept the CE mark as the
required  regulatory  approval for product entry and utilization.  Some of these
countries include Belgium, Denmark, France, Germany, Italy, Sweden, Switzerland,
and the Netherlands.

ASIA
----
Since Asia does not have an encompassing  regulatory  approval  process and each
country  requires  its  own  approval  process,  the  following  countries  have
regulatory approval for the Shasta 5000 BSN: Australia, Japan.

Nortel Networks is in the process of obtaining regulatory approval for Singapore
and Hong Kong. Until the Shasta 5000 BSN is approved in these countries,  Nortel
Networks can only ship these units to Savvis Communications as evaluation units.
Nortel  Networks  expects to obtain  regulatory  approval for these locations by
year end 2000.

SOUTH AMERICA:
--------------
Approved:
Brazil
Peru
Venequela
Columbia

Argentina approval is expected 3rd quarter 2000
Mexico approval is expected 3rd quarter 2000



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