Amendment No. 1 To Agreement For The Provision of Hardware

Exhibit 10.25


THIS FIRST AMENDMENT is effective on February 2, 2004 (the " Effective Date" ),


between

Vodafone Libertel N.V., whose registered office is at Avenue Ceramigue 300, 6221 KX Maastricht, the Netherlands (' Vodafone' ) of the one part


and


Sycamore Networks, Inc., a Delaware corporation, whose principal place of business is at 220 Mill Road, Chelmsford, MA 01824, USA (' Supplier' ) of the other part.


WHEREAS:


Vodafone and Supplier have entered into an Agreement for the Provision of Hardware, Software, Training, Support and Maintenance and Project Management Services to Vodafone Libertel N.V., dated June 12, 2002 (the " Purchase Agreement" ) and wish to amend the Purchase Agreement as set forth below.


NOW THEREFORE: for good and valuable consideration, the receipt and sufficiency of which is hereby acknowledged the parties hereby agree to modify the Purchase Agreement as follows:

1. Capitalized terms used herein and not otherwise defined herein shall have such meaning as set forth in the Purchase Agreement.

2. Section 14 Price

The first sentence of this section is deleted in its entirety and replaced with the following:


The Price for each Deliverable shall be as detailed within Supplier' s then current [*].


3. Section 15.7 Invoices


Sections 15.7.1 and 15.7.2 of the Purchase Agreement are deleted in their entirety and replaced with the following:

15.7.1 Purchases from Supplier shall be invoiced by Supplier and paid by ...