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     <!-- Project:        I:\CONVER\ny13957.eep                                            -->
     <!-- Control Number: NY13957                                                          -->
     <!-- Rev Number:     C.Brenner                                                        -->
     <!-- Client Name:    Sycamore Networks Inc                                            -->
     <!-- Project Name:   NY13957 - 8-K                                                    -->
     <!-- Firm Name:                                                                       -->
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<TD><H1 ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2>UNITED
STATES<br>SECURITIES AND EXCHANGE COMMISSION<br>Washington, D.C. 20549  </FONT></H1></TD></TR>
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<TD><H1 ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2>FORM
8-K  </FONT></H1></TD></TR>
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<TD ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2>CURRENT
REPORT<BR>Pursuant to Section 13 or 15(d) of the<BR> Securities Exchange Act of 1934  </FONT></TD></TR>
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<TD ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2>December 21, 2004<br>Date
of Report (Date of earliest event reported)</FONT></TD></TR>
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     <TD WIDTH="600" ALIGN="CENTER"><FONT FACE="Times New Roman, Times, Serif" SIZE="2"><B>&nbsp;<!-- Name of Registrant -->SYCAMORE NETWORKS, INC.</B></FONT></TD></TR>
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     <TD WIDTH="600" ALIGN="CENTER"><FONT FACE="Times New Roman, Times, Serif" SIZE="2">(Exact Name of Registrant as Specified in its Charter)</FONT></TD></TR>
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<TD WIDTH="33%" ALIGN="CENTER"><FONT FACE="Times New Roman, Times, Serif" SIZE=2><!-- State-->Delaware</FONT></TD>
<TD WIDTH="34%" ALIGN="CENTER"><FONT FACE="Times New Roman, Times, Serif" SIZE=2><!-- File No.-->000-27273</FONT></TD>
<TD WIDTH="33%" ALIGN="CENTER"><FONT FACE="Times New Roman, Times, Serif" SIZE=2><!-- Irs No.-->04-3410558</FONT></TD>
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<TD ALIGN="CENTER"><Font Face="Times New Roman, Times, Serif" Size=2>(State or Other Jurisdiction <BR>of Incorporation)</font></td>
<TD ALIGN="CENTER"><Font Face="Times New Roman, Times, Serif" Size=2>(Commission<BR>File Number) </FONT></TD>
<TD ALIGN="CENTER"><Font Face="Times New Roman, Times, Serif" Size=2>(IRS Employer<BR> Identification No.) </FONT></TD>
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<TD ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2>220
Mill Road <BR>Chelmsford, MA 01824<BR>(Address of Principal Executive Offices)<BR>
(Zip Code)</FONT></TD></TR>
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<TD ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2>Registrant's
Telephone Number, including Area Code:&nbsp;&nbsp;(978) 250-2900 </FONT></TD></TR>
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<TD ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2>Not
Applicable<BR>(Former Name or Former Address, if Changed Since Last Report) </FONT></TD></TR>
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<TD><FONT FACE="Times New Roman, Times, Serif" SIZE=2>Check
the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the
filing obligation of the registrant under any of the following provisions: </FONT></TD></TR></TABLE><BR>

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<TD WIDTH=4%><font face="wingdings"> &#168; </font></TD>
<TD WIDTH=96%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>
 Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) </FONT></TD>
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<TD WIDTH=96%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>
 Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) </FONT></TD>
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<TD WIDTH=4%><font face="wingdings"> &#168; </font></TD>
<TD WIDTH=96%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>
 Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR
240.14d-2(b)) </FONT></TD>
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<TD WIDTH=96%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>
 Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR
240.13e-4(c)) </FONT></TD>
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<H1 ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>Item
1.01&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Entry into a Material Definitive Agreement.</FONT></H1></TD></TR>
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<TD><FONT FACE="Times New Roman, Times, Serif" SIZE=2>On
December 21, 2004 Sycamore Networks, Inc., entered into the fifth amendment to its
agreement with Vodafone Limited, whose registered office is in Berkshire, England
(&#147;Vodafone&#148;) dated November 16, 2000, whereby Sycamore is required to provide
the hardware, software, training, support and maintenance and project management services
to Vodafone on the terms set forth in the Agreement. Such amendment primarily changes the
currency of payment to United States Dollars. </FONT></TD></TR></TABLE><BR>

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<TD><FONT FACE="Times New Roman, Times, Serif" SIZE=2>Under
         the agreement, Sycamore has supplied and continues to supply all the
licensed programs, equipment and project management services ordered by
Vodafone. The initial term of
the agreement was 24 months which has been renewed automatically for 12 months
periods. The agreement may be terminated by 120 days written notice or for cause
upon 30 days notice. This discussion does not purport to be complete and is
qualified in its entirety by reference to the agreement, as amended, which will
be filed by the company as an exhibit to its Quarterly Report on Form 10-Q.
</FONT></TD></TR></TABLE><BR>


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<TD><H1 ALIGN=CENTER><FONT FACE="Times New Roman, Times, Serif" SIZE=2>SIGNATURES </FONT></H1></TD></TR>
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<TD><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Pursuant
to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused
this report to be signed on its behalf by the undersigned thereunto duly authorized. </FONT></TD></TR>
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    <TD WIDTH="8%"><FONT FACE="Times New Roman, Times, Serif" SIZE="2"> &nbsp;<!-- TYPE "DATE:" HERE--> </FONT></TD>
    <TD WIDTH="44%"><FONT FACE="Times New Roman, Times, Serif" SIZE="2">&nbsp; </FONT></TD>
    <TD WIDTH="48%"><FONT FACE="Times New Roman, Times, Serif" SIZE="2">Sycamore Networks, Inc.<!-- COMPANY --> </FONT></TD>
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<TD WIDTH=44%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp; </FONT></TD>
<TD WIDTH=48%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>/s/&nbsp; Richard J. Gaynor </FONT></TD>
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<TD><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;</FONT></TD>
<TD><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;</FONT></TD>
<TD COLSPAN=1><HR NOSHADE SIZE="1"> </TD>
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    <TD WIDTH="8%"><FONT FACE="Times New Roman, Times, Serif" SIZE="2">&nbsp; </FONT></TD>
    <TD WIDTH="44%"><FONT FACE="Times New Roman, Times, Serif" SIZE="2">&nbsp;<!-- COMPANY --> </FONT></TD>
    <TD WIDTH="48%"><FONT FACE="Times New Roman, Times, Serif" SIZE="2">Richard J. Gaynor<BR>
Chief Financial Officer and Vice President of Finance and Administration<!-- TYPE "DATE:" HERE--> </FONT></TD>
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<P ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>Dated:
February 4, 2005 </FONT></P></TD></TR>
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{"company-data": {"conformed-name": "SYCAMORE NETWORKS INC", "cik": "0001092367", "assigned-sic": "3661", "irs-number": "043410558", "state-of-incorporation": "DE", "fiscal-year-end": "0731"}, "filing-values": {"form-type": "8-K", "act": "34", "file-number": "000-27273", "film-number": "05575718"}, "business-address": {"street1": "220 MILL ROAD", "city": "CHELMSFORD", "state": "MA", "zip": "01824", "phone": "9782502900"}, "mail-address": {"street1": "220 MILL ROAD", "city": "CHELMSFORD", "state": "MA", "zip": "01824"}}
8-K
UNITED
STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
FORM
8-K
CURRENT
REPORT
Pursuant to Section 13 or 15(d) of the
Securities Exchange Act of 1934
December 21, 2004
Date
of Report (Date of earliest event reported)
SYCAMORE NETWORKS, INC.
(Exact Name of Registrant as Specified in its Charter)
Delaware
000-27273
04-3410558
(State or Other Jurisdiction
of Incorporation)
(Commission
File Number)
(IRS Employer
Identification No.)
220
Mill Road
Chelmsford, MA 01824
(Address of Principal Executive Offices)
(Zip Code)
Registrant's
Telephone Number, including Area Code:  (978) 250-2900
Not
Applicable
(Former Name or Former Address, if Changed Since Last Report)
Check
the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the
filing obligation of the registrant under any of the following provisions:
¨
Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)
¨
Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)
¨
Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR
240.14d-2(b))
¨
Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR
240.13e-4(c))
Item
1.01      Entry into a Material Definitive Agreement.
On
December 21, 2004 Sycamore Networks, Inc., entered into the fifth amendment to its
agreement with Vodafone Limited, whose registered office is in Berkshire, England
("Vodafone") dated November 16, 2000, whereby Sycamore is required to provide
the hardware, software, training, support and maintenance and project management services
to Vodafone on the terms set forth in the Agreement. Such amendment primarily changes the
currency of payment to United States Dollars.
Under
         the agreement, Sycamore has supplied and continues to supply all the
licensed programs, equipment and project management services ordered by
Vodafone. The initial term of
the agreement was 24 months which has been renewed automatically for 12 months
periods. The agreement may be terminated by 120 days written notice or for cause
upon 30 days notice. This discussion does not purport to be complete and is
qualified in its entirety by reference to the agreement, as amended, which will
be filed by the company as an exhibit to its Quarterly Report on Form 10-Q.
SIGNATURES
Pursuant
to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused
this report to be signed on its behalf by the undersigned thereunto duly authorized.
Sycamore Networks, Inc.
/s/  Richard J. Gaynor
Richard J. Gaynor
Chief Financial Officer and Vice President of Finance and Administration
Dated:
February 4, 2005