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     <!-- Project:        I:\CONVER\ny14440.eep                                            -->
     <!-- Control Number: NY14440                                                          -->
     <!-- Rev Number:     Chayoun                                                          -->
     <!-- Client Name:    Sycamore Networks Inc                                            -->
     <!-- Project Name:   NY14440 - 8-K                                                    -->
     <!-- Firm Name:                                                                       -->
     <TITLE>8-K</TITLE>
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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>April 29, 2005<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>
<TR VALIGN="TOP">
     <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>
</TR>
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<TD WIDTH="33%"ALIGN="CENTER"><HR SIZE=1 NOSHADE></TD>
<td WIDTH="34%"ALIGN="CENTER"><HR SIZE=1 NOSHADE></TD>
<TD WIDTH="33%"ALIGN="CENTER"><HR SIZE=1 NOSHADE></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
 (see General Instruction A.2. below): </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=4%><font face="wingdings"> &#168; </font></TD>
<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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<TD>
<H1 ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>Item
2.05: Costs Associated with Exit of Disposal Activities.</FONT></H1></TD></TR>
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<TD><FONT FACE="Times New Roman, Times, Serif" SIZE=2>
On April 29, 2005, the Registrant committed to a reduction of its workforce by
approximately 20 employees or 6% of the Registrant&#146;s total workforce,
effective immediately, by the notification of the employees affected. This
workforce reduction is a result of the rationalization of certain R&amp;D
initiatives.  At this time the Registrant estimates that the
amounts for each major type of cost associated with this course of actions are
as follows: </FONT></TD></TR></TABLE><BR>



<TABLE CELLPADDING=0 CELLSPACING=0 BORDER=0 WIDTH=600>
<TR VALIGN=Bottom>
     <TH COLSPAN=2><FONT FACE="Times New Roman, Times, Serif" SIZE=2></FONT></TH>
     <TH COLSPAN=2><FONT FACE="Times New Roman, Times, Serif" SIZE=2></FONT></TH>
     <TH COLSPAN=2><FONT FACE="Times New Roman, Times, Serif" SIZE=2></FONT></TH></TR>
<TR VALIGN=Bottom>
     <TD WIDTH=67% ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>Severance and other employee related</FONT></TD>
     <TD WIDTH=3% ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;</FONT></TD>
     <TD WIDTH=2% ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>$</FONT></TD>
     <TD WIDTH=3% ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;</FONT></TD>
     <TD WIDTH=23% ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>.50 - .60 million</FONT></TD>
     <TD WIDTH=2% ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;</FONT></TD></TR>
<TR VALIGN=Bottom>
     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>Impairment charges for fixed assets and inventory</FONT></TD><TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;</FONT></TD>
     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>$</FONT></TD><TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;</FONT></TD>
     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>.20 - .35 million</FONT></TD><TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;</FONT></TD></TR>
<TR VALIGN=Bottom>
     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>Other costs</FONT></TD><TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;</FONT></TD>
     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>$</FONT></TD><TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;</FONT></TD>
     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>.30 - .65 million</FONT></TD><TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;</FONT></TD></TR>
<TR>
     <TD COLSPAN=2></TD>
<TD COLSPAN=4 ALIGN=RIGHT><HR SIZE="1" WIDTH="65%" ALIGN="LEFT"></TD>
     <TD COLSPAN=2></TD></TR>

<TR VALIGN=Bottom>
     <TD ALIGN=LEFT><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;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Total Estimate</FONT></TD><TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;</FONT></TD>
     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>$</FONT></TD><TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;</FONT></TD>
     <TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>1.0 - 1.6 million</FONT></TD><TD ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;</FONT></TD></TR>
<TR>
     <TD COLSPAN=2></TD>
<TD COLSPAN=4 ALIGN=RIGHT><HR SIZE="1" WIDTH="65%" ALIGN="LEFT"></TD>
     <TD COLSPAN=2></TD></TR>
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<TD><FONT FACE="Times New Roman, Times, Serif" SIZE=2>These
restructuring charges will all be recorded in the Registrant&#146;s third quarter results
for the period ended April 30, 2005. At this time, the Registrant estimates that
approximately $.8- $1.2 million of the total cost is expected to result in future cash
expenditures. </FONT></TD></TR></TABLE><BR>


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<TD><FONT FACE="Times New Roman, Times, Serif" SIZE=2>The Registrant's press release announcing the workforce reduction is attached as Exhibit 99.1 to this Current
Report on Form 8-K and incorporated by reference herein.</FONT></TD></TR></TABLE><BR>



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<TD>
<H1 ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>Item
9.01: Financial Statements and Exhibits.</FONT></H1></TD></TR>
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<TD><FONT FACE="Times New Roman, Times, Serif" SIZE=2>(c)
&nbsp;&nbsp;Exhibits.  </FONT></TD></TR></TABLE><BR>


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<TD WIDTH=13%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>Exhibit<BR>
<U>Number</U>  </FONT></TD>
<TD WIDTH=3%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH=84%><FONT FACE="Times New Roman, Times, Serif" SIZE=2><U>Description</U>  </FONT></TD>
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<TD WIDTH=13%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>99.1  </FONT></TD>
<TD WIDTH=3%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH=84%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>Press
Release of the Registrant, dated April 29, 2005. </FONT></TD>
</TR>
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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>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></TABLE><BR>







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<TD>
<P ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>Sycamore
Networks, Inc. </FONT></P></TD></TR>
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<TD>
<P ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2><U>/s/ Richard J. Gaynor&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</U><BR>
Richard J. Gaynor<BR>
Chief Financial Officer<BR>
(Duly Authorized Officer and Principal<BR>
Financial and Accounting Officer) </FONT></P></TD></TR>
</TABLE>
<BR>



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<P ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>Dated:
April 29, 2005 </FONT></P></TD></TR>
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<P ALIGN=LEFT><FONT FACE="Times New Roman, Times, Serif" SIZE=2>EXHIBIT
INDEX </FONT></P></TD></TR>
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<TD WIDTH=13%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>Exhibit<BR>
<U>Number</U>  </FONT></TD>
<TD WIDTH=3%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH=84%><FONT FACE="Times New Roman, Times, Serif" SIZE=2><U>Description</U></FONT></TD>
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<TD WIDTH=13%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>99.1  </FONT></TD>
<TD WIDTH=3%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>&nbsp;</FONT></TD>
<TD WIDTH=84%><FONT FACE="Times New Roman, Times, Serif" SIZE=2>Press
Release of the Registrant, dated April 29, 2005. </FONT></TD>
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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": "05782759"}, "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
April 29, 2005
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
 (see General Instruction A.2. below):
¨
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
2.05: Costs Associated with Exit of Disposal Activities.
On April 29, 2005, the Registrant committed to a reduction of its workforce by
approximately 20 employees or 6% of the Registrant's total workforce,
effective immediately, by the notification of the employees affected. This
workforce reduction is a result of the rationalization of certain R&D
initiatives.  At this time the Registrant estimates that the
amounts for each major type of cost associated with this course of actions are
as follows:
Severance and other employee related
$
.50 - .60 million
Impairment charges for fixed assets and inventory
$
.20 - .35 million
Other costs
$
.30 - .65 million
Total Estimate
$
1.0 - 1.6 million
These
restructuring charges will all be recorded in the Registrant's third quarter results
for the period ended April 30, 2005. At this time, the Registrant estimates that
approximately $.8- $1.2 million of the total cost is expected to result in future cash
expenditures.
The Registrant's press release announcing the workforce reduction is attached as Exhibit 99.1 to this Current
Report on Form 8-K and incorporated by reference herein.
Item
9.01: Financial Statements and Exhibits.
(c)
  Exhibits.
Exhibit
Number
Description
99.1
Press
Release of the Registrant, dated April 29, 2005.
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
(Duly Authorized Officer and Principal
Financial and Accounting Officer)
Dated:
April 29, 2005
EXHIBIT
INDEX
Exhibit
Number
Description
99.1
Press
Release of the Registrant, dated April 29, 2005.