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 <P STYLE="line-height:3.0pt;margin-top:0pt;margin-bottom:0pt;border-bottom:1px solid #000000">&nbsp;</P>
<P STYLE="line-height:3.0pt;margin-top:0pt;margin-bottom:2pt;border-bottom:1px solid #000000">&nbsp;</P> <P STYLE="margin-top:4pt; margin-bottom:0pt; font-size:18pt; font-family:Times New Roman" ALIGN="center"><B>UNITED STATES </B></P>
<P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:18pt; font-family:Times New Roman" ALIGN="center"><B>SECURITIES AND EXCHANGE COMMISSION </B></P>
<P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:12pt; font-family:Times New Roman" ALIGN="center"><B>WASHINGTON, D.C. 20549 </B></P> <P STYLE="font-size:12pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P><center>
<P STYLE="line-height:6.0pt;margin-top:0pt;margin-bottom:2pt;border-bottom:1.00pt solid #000000;width:21%">&nbsp;</P></center> <P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:18pt; font-family:Times New Roman" ALIGN="center"><B>FORM 8-K
</B></P> <P STYLE="font-size:12pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P><center> <P STYLE="line-height:6.0pt;margin-top:0pt;margin-bottom:2pt;border-bottom:1.00pt solid #000000;width:21%">&nbsp;</P></center>
<P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:12pt; font-family:Times New Roman" ALIGN="center"><B>CURRENT REPORT </B></P> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:12pt; font-family:Times New Roman" ALIGN="center"><B>Pursuant
to Section&nbsp;13 or 15(d) </B></P> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:12pt; font-family:Times New Roman" ALIGN="center"><B>of the Securities Exchange Act of 1934 </B></P>
<P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:12pt; font-family:Times New Roman" ALIGN="center"><B>Date of Report (Date of earliest event reported): </B></P>
<P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:12pt; font-family:Times New Roman" ALIGN="center"><B>February&nbsp;18, 2014 </B></P> <P STYLE="font-size:12pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P><center>
<P STYLE="line-height:6.0pt;margin-top:0pt;margin-bottom:2pt;border-bottom:1.00pt solid #000000;width:21%">&nbsp;</P></center> <P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:24pt; font-family:Times New Roman" ALIGN="center"><B>Performance
Technologies, Incorporated </B></P> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center"><B>(Exact Name of Registrant as Specified in its Charter) </B></P>
<P STYLE="font-size:12pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P><center> <P STYLE="line-height:6.0pt;margin-top:0pt;margin-bottom:2pt;border-bottom:1.00pt solid #000000;width:21%">&nbsp;</P></center>
<P STYLE="font-size:12pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P>
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<TD VALIGN="top" ALIGN="center"><B>Delaware</B></TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top" ALIGN="center"><B>0-27460</B></TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top" ALIGN="center"><B>16-1158413</B></TD></TR>
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<TD VALIGN="top" ALIGN="center"> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:8pt; font-family:Times New Roman" ALIGN="center"><B>(State or Other Jurisdiction</B></P>
<P STYLE="margin-top:0pt; margin-bottom:1pt; font-size:8pt; font-family:Times New Roman" ALIGN="center"><B>of Incorporation)</B></P></TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top" ALIGN="center"> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:8pt; font-family:Times New Roman" ALIGN="center"><B>(Commission</B></P>
<P STYLE="margin-top:0pt; margin-bottom:1pt; font-size:8pt; font-family:Times New Roman" ALIGN="center"><B>File Number)</B></P></TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top" ALIGN="center"> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:8pt; font-family:Times New Roman" ALIGN="center"><B>(IRS Employer</B></P>
<P STYLE="margin-top:0pt; margin-bottom:1pt; font-size:8pt; font-family:Times New Roman" ALIGN="center"><B>Identification No.)</B></P></TD></TR>
</TABLE> <P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center"><B>140 Canal View Boulevard, Rochester, New York 14623 </B></P>
<P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:8pt; font-family:Times New Roman" ALIGN="center"><B>(Address of Principal Executive Offices) (Zip Code) </B></P>
<P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center"><B>(585) 256-0200 </B></P>
<P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:8pt; font-family:Times New Roman" ALIGN="center"><B>(Registrant&#146;s telephone number, including area code) </B></P>
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<P STYLE="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">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): </P> <P STYLE="font-size:6pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P>
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<TD ALIGN="left" VALIGN="top">Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) </TD></TR></TABLE> <P STYLE="font-size:6pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P>
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<TD ALIGN="left" VALIGN="top">Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) </TD></TR></TABLE> <P STYLE="font-size:6pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P>
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<TD WIDTH="4%" VALIGN="top" ALIGN="left"><FONT STYLE="FONT-FAMILY:WINGDINGS">&#168;</FONT></TD>
<TD ALIGN="left" VALIGN="top">Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) </TD></TR></TABLE> <P STYLE="font-size:6pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P>
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<TD WIDTH="4%" VALIGN="top" ALIGN="left"><FONT STYLE="FONT-FAMILY:WINGDINGS">&#168;</FONT></TD>
<TD ALIGN="left" VALIGN="top">Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c)) </TD></TR></TABLE> <P STYLE="font-size:10pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P>
<P STYLE="line-height:3.0pt;margin-top:0pt;margin-bottom:0pt;border-bottom:1px solid #000000">&nbsp;</P> <P STYLE="line-height:3.0pt;margin-top:0pt;margin-bottom:2pt;border-bottom:1px solid #000000">&nbsp;</P>


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<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0 0 12pt">Introduction.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-indent: 0.5in">On February 19, 2014, pursuant to the
Agreement and Plan of Merger (the &ldquo;Merger Agreement&rdquo;), dated as of December 12, 2013, by and among Sonus Networks,
Inc. (&ldquo;Sonus&rdquo;), Purple Acquisition Subsidiary, Inc. (&ldquo;Merger Sub&rdquo;) and Performance Technologies, Incorporated
(&ldquo;PT&rdquo;), Merger Sub merged with and into PT with PT surviving and becoming a wholly-owned subsidiary of Sonus (the &ldquo;Merger&rdquo;).
PT&rsquo;s stockholders adopted the Merger Agreement at a special meeting of stockholders held on February 18, 2014. Terms not
otherwise defined herein shall have the meanings ascribed to them in the Merger Agreement.</P>

<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0 0 12pt">Item&nbsp;2.01&#9;Completion of Acquisition or Disposition
of Assets.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-indent: 0.5in">At 12:01 a.m. on February 19, 2014 (the
&ldquo;Effective Time&rdquo;), each share of PT&rsquo;s common stock, par value $0.01 per share, issued and outstanding immediately
prior to the Effective Time was cancelled and converted automatically into the right to receive $3.75 in cash (the &ldquo;Merger
Consideration&rdquo;), except with respect to shares of PT common stock held by any holder who properly exercised appraisal rights
of such shares in accordance with Section 262 of the Delaware General Corporate Law (&ldquo;DGCL&rdquo;). All shares of PT common
stock owned by Sonus, Merger Sub or PT were automatically cancelled, and no payment was made with respect thereto.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-indent: 0.5in">Holders of vested PT stock options with
an exercise price less than $3.75 were permitted to conditionally exercise such vested stock options, which exercise was effective
at the Effective Time. PT option holders that elected to participate in the conditional option exercise are entitled to receive
a cash payment equal to $3.75 for each share underlying their PT stock options, less the amount of the applicable exercise price
and any required tax withholdings.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-indent: 0.5in">In addition, at the Effective Time of
the Merger, Sonus assumed all of the then outstanding stock options under the Company&rsquo;s 2001 Stock Option Plan, 2003 Omnibus
Incentive Plan and 2012 Omnibus Incentive Plan (the &ldquo;Assumed Options&rdquo;), but will substitute shares of Sonus&rsquo;s
common stock for shares of PT&rsquo;s common stock issuable upon exercise of the Assumed Options based on the Equity Award Exchange
Ratio articulated in the Merger Agreement. Sonus will also assume PT&rsquo;s 2003 Omnibus Incentive Plan and 2012 Omnibus Incentive
Plan, but will substitute shares of Sonus&rsquo;s common stock for shares of PT&rsquo;s common stock issuable under such plans.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-indent: 0.5in">As a result of the Merger, former PT
stockholders will receive Merger Consideration in the aggregate amount of approximately $44 million.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-indent: 0.5in">The foregoing summary does not purport
to be complete and is qualified in its entirety by reference to the Merger Agreement, a copy of which was filed as Exhibit 2 to
PT&rsquo;s Current Report on Form 8-K filed with the Securities and Exchange Commission (the &ldquo;SEC&rdquo;) on December 13,
2013 and is incorporated into this Item 2.01 by reference.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 12pt"><B>Item 3.01&#9;Notice of Delisting or Failure to Satisfy
a Continued Listing Rule or Standard; Transfer of Listing.</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-indent: 0.5in">On February 19, 2014, PT requested that
NASDAQ suspend PT&rsquo;s common stock from trading on the NASDAQ Global Market due to the Closing of the Merger. In connection
with PT&rsquo;s request, PT expects that NASDAQ will file a Form 25 with the SEC to notify the SEC of PT&rsquo;s removal from listing
and registration under Section 12(b) of the Securities Exchange Act of 1934. PT expects that Sonus will file a Form 15 with the
SEC after effectiveness of the Form 25 to suspend PT&rsquo;s reporting requirements under Sections 13 and 15(d) of the Securities
Exchange Act of 1934.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 12pt"><B>Item 3.03&#9;Material Modification to Rights of Security
Holders.</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-indent: 0.5in">See Item 2.01 of this Current Report
on Form 8-K, which is incorporated into this Item 3.03 by reference.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 12pt"><B>Item 5.01&#9;Changes in Control.</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-indent: 0.5in">As described under Item 2.01 of this
Current Report on Form 8-K, which is incorporated into this Item 5.01 by reference, upon the Closing of the Merger on February
19, 2014, a change in control of PT occurred, such that PT now is a wholly-owned subsidiary of Sonus. The Merger Consideration
is being funded by Sonus through Sonus&rsquo;s existing cash on hand and cash acquired from PT.</P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-indent: 0.5in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 12pt"><B>Item 5.02&#9;Departure of Directors or Certain Officers;
Election of Directors; Appointment of Certain Directors; &#9;&#9;Compensatory Arrangements for Certain Officers.</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-indent: 0.5in">Pursuant to the Merger Agreement, Dennis
C. Connors, Charles E. Maginness, Stuart B. Meisenzahl, John M. Slusser and Robert L. Tillman resigned from their positions on
PT&rsquo;s board of directors and any committees thereof effective as of the Effective Time. In addition, PT&rsquo;s President
and Chief Executive Officer, John M. Slusser; Senior Vice President and Chief Financial Officer, Dorrance W. Lamb; Senior Vice
President - Sales, Marketing and Services, J. Patrick Rice; and Senior Vice President - Products and Technology, John J. Grana also
resigned in their capacities as officers of PT effective as of the Closing of the Merger. As provided in the Merger Agreement,
Mark T. Greenquist and Jeffrey M. Snider, the directors of the Merger Sub immediately prior to the Effective Time, and Raymond
P. Dolan, Mark T. Greenquist and Jeffrey M. Snider, the officers of the Merger Sub immediately prior to the Effective Time, will
be the initial directors and officers, respectively, of PT as the surviving corporation, in each case until their successors are
elected or designated and qualified, or until their earlier death, resignation or removal from office.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 12pt"><B>Item 5.03&#9;Amendments to Articles of Incorporation or
Bylaws; Change in Fiscal Year.</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-indent: 0.5in">Upon the Effective Time, PT&rsquo;s Certificate
of Incorporation was amended and restated in its entirety. Pursuant to the Merger Agreement, the By-Laws of the Merger Sub in effect
immediately prior to the Effective Time became the By-Laws of PT as the surviving corporation. Copies of the Amended and Restated
Certificate of Incorporation and the By-Laws of PT are filed herewith as Exhibits 3.1 and 3.2, respectively.</P>

<P STYLE="font: 10pt/12pt Times New Roman, Times, Serif; margin: 0"><B>Item 5.07&#9;Submission of Matters to a Vote of Security
Holders.</B></P>

<P STYLE="font: 10pt/12pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>

<P STYLE="font: 10pt/12pt Times New Roman, Times, Serif; margin: 0; text-indent: 0.5in">On February 18, 2014, PT held a special
meeting of PT stockholders in connection with the Merger (the &ldquo;Special Meeting&rdquo;). At the Special Meeting, PT stockholders
present in person or by proxy adopted the Merger Agreement, based on the following votes:&nbsp;</P>

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    <TD STYLE="width: 24%; padding: 0.75pt">&nbsp;</TD>
    <TD STYLE="width: 1%; padding: 0.75pt">&nbsp;</TD>
    <TD STYLE="width: 24%; padding: 0.75pt">&nbsp;</TD>
    <TD STYLE="width: 1%; padding: 0.75pt">&nbsp;</TD>
    <TD STYLE="width: 25%; padding: 0.75pt">&nbsp;</TD>
    <TD STYLE="width: 1%; padding: 0.75pt">&nbsp;</TD>
    <TD STYLE="width: 24%; padding: 0.75pt">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: white">
    <TD STYLE="font: 10pt/115% Calibri, Helvetica, Sans-Serif; padding-top: 0.75pt; padding-right: 0.75pt; padding-left: 0.75pt; text-align: center"><FONT STYLE="font: 10pt Times New Roman, Times, Serif"><B><U>Votes For</U></B></FONT></TD>
    <TD STYLE="padding: 0.75pt">&nbsp;</TD>
    <TD STYLE="font: 10pt/115% Calibri, Helvetica, Sans-Serif; padding-top: 0.75pt; padding-right: 0.75pt; padding-left: 0.75pt; text-align: center"><FONT STYLE="font: 10pt Times New Roman, Times, Serif"><B><U>Votes Against</U></B></FONT></TD>
    <TD STYLE="padding: 0.75pt">&nbsp;</TD>
    <TD STYLE="font: 10pt/115% Calibri, Helvetica, Sans-Serif; padding-top: 0.75pt; padding-right: 0.75pt; padding-left: 0.75pt; text-align: center"><FONT STYLE="font: 10pt Times New Roman, Times, Serif"><B><U>Votes Abstained</U></B></FONT></TD>
    <TD STYLE="padding: 0.75pt">&nbsp;</TD>
    <TD STYLE="font: 10pt/115% Calibri, Helvetica, Sans-Serif; padding-top: 0.75pt; padding-right: 0.75pt; padding-left: 0.75pt; text-align: center"><FONT STYLE="font: 10pt Times New Roman, Times, Serif"><B><U>Broker Non-Votes</U></B></FONT></TD></TR>
<TR STYLE="vertical-align: bottom; background-color: white">
    <TD STYLE="font: 10pt/115% Calibri, Helvetica, Sans-Serif; padding-top: 0.75pt; padding-right: 0.75pt; padding-left: 0.75pt; text-indent: 0.5in"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">8,164,586</FONT></TD>
    <TD STYLE="padding: 0.75pt">&nbsp;</TD>
    <TD STYLE="font: 10pt/115% Calibri, Helvetica, Sans-Serif; padding-top: 0.75pt; padding-right: 0.75pt; padding-left: 0.75pt; text-indent: 48pt"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">135,921</FONT></TD>
    <TD STYLE="padding: 0.75pt">&nbsp;</TD>
    <TD STYLE="font: 10pt/115% Calibri, Helvetica, Sans-Serif; padding-top: 0.75pt; padding-right: 0.75pt; padding-left: 0.75pt; text-indent: 53.25pt"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">200</FONT></TD>
    <TD STYLE="padding: 0.75pt">&nbsp;</TD>
    <TD STYLE="font: 10pt/115% Calibri, Helvetica, Sans-Serif; padding-top: 0.75pt; padding-right: 0.75pt; padding-left: 0.75pt; text-indent: 59.25pt"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">0</FONT></TD></TR>
</TABLE>
<P STYLE="font: 10pt/12pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>

<P STYLE="font: 10pt/12pt Times New Roman, Times, Serif; margin: 0; text-indent: 0.5in">At the Special Meeting, PT stockholders
present in person or by proxy approved a non-binding, advisory proposal regarding the compensation that may become payable to
PT&rsquo;s named executive officers in connection with the completion of the Merger, based on the following votes:&nbsp;</P>

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    <TD STYLE="width: 24%; padding: 0.75pt">&nbsp;</TD>
    <TD STYLE="width: 1%; padding: 0.75pt">&nbsp;</TD>
    <TD STYLE="width: 24%; padding: 0.75pt">&nbsp;</TD>
    <TD STYLE="width: 1%; padding: 0.75pt">&nbsp;</TD>
    <TD STYLE="width: 25%; padding: 0.75pt">&nbsp;</TD>
    <TD STYLE="width: 1%; padding: 0.75pt">&nbsp;</TD>
    <TD STYLE="width: 24%; padding: 0.75pt">&nbsp;</TD></TR>
<TR STYLE="vertical-align: bottom; background-color: white">
    <TD STYLE="font: 10pt/115% Calibri, Helvetica, Sans-Serif; padding-top: 0.75pt; padding-right: 0.75pt; padding-left: 0.75pt; text-align: center"><FONT STYLE="font: 10pt Times New Roman, Times, Serif"><B><U>Votes For</U></B></FONT></TD>
    <TD STYLE="padding: 0.75pt">&nbsp;</TD>
    <TD STYLE="font: 10pt/115% Calibri, Helvetica, Sans-Serif; padding-top: 0.75pt; padding-right: 0.75pt; padding-left: 0.75pt; text-align: center"><FONT STYLE="font: 10pt Times New Roman, Times, Serif"><B><U>Votes Against</U></B></FONT></TD>
    <TD STYLE="padding: 0.75pt">&nbsp;</TD>
    <TD STYLE="font: 10pt/115% Calibri, Helvetica, Sans-Serif; padding-top: 0.75pt; padding-right: 0.75pt; padding-left: 0.75pt; text-align: center"><FONT STYLE="font: 10pt Times New Roman, Times, Serif"><B><U>Votes Abstained</U></B></FONT></TD>
    <TD STYLE="padding: 0.75pt">&nbsp;</TD>
    <TD STYLE="font: 10pt/115% Calibri, Helvetica, Sans-Serif; padding-top: 0.75pt; padding-right: 0.75pt; padding-left: 0.75pt; text-align: center"><FONT STYLE="font: 10pt Times New Roman, Times, Serif"><B><U>Broker Non-Votes</U></B></FONT></TD></TR>
<TR STYLE="vertical-align: bottom; background-color: white">
    <TD STYLE="font: 10pt/115% Calibri, Helvetica, Sans-Serif; padding-top: 0.75pt; padding-right: 0.75pt; padding-left: 0.75pt; text-indent: 0.5in"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">7,526,986</FONT></TD>
    <TD STYLE="padding: 0.75pt">&nbsp;</TD>
    <TD STYLE="font: 10pt/115% Calibri, Helvetica, Sans-Serif; padding-top: 0.75pt; padding-right: 0.75pt; padding-left: 0.75pt; text-indent: 40.5pt"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">301,598</FONT></TD>
    <TD STYLE="padding: 0.75pt">&nbsp;</TD>
    <TD STYLE="font: 10pt/115% Calibri, Helvetica, Sans-Serif; padding-top: 0.75pt; padding-right: 0.75pt; padding-left: 0.75pt; text-indent: 48pt"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">472,123</FONT></TD>
    <TD STYLE="padding: 0.75pt">&nbsp;</TD>
    <TD STYLE="font: 10pt/115% Calibri, Helvetica, Sans-Serif; padding-top: 0.75pt; padding-right: 0.75pt; padding-left: 0.75pt; text-indent: 59.25pt"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">0</FONT></TD></TR>
</TABLE>
<P STYLE="font: 10pt/12pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>

<P STYLE="font: 10pt/12pt Times New Roman, Times, Serif; margin: 0; text-indent: 0.5in">At the Special Meeting, PT stockholders
present in person or by proxy also approved the adjournment of the Special Meeting, if necessary or appropriate, to solicit additional
proxies if there were not sufficient votes to approve the preceding proposal, based on the following votes:</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="width: 100%">
<TR>
    <TD STYLE="width: 24%; padding: 0.75pt">&nbsp;</TD>
    <TD STYLE="width: 1%; padding: 0.75pt">&nbsp;</TD>
    <TD STYLE="width: 24%; padding: 0.75pt">&nbsp;</TD>
    <TD STYLE="width: 1%; padding: 0.75pt">&nbsp;</TD>
    <TD STYLE="width: 25%; padding: 0.75pt">&nbsp;</TD>
    <TD STYLE="width: 1%; padding: 0.75pt">&nbsp;</TD>
    <TD STYLE="width: 24%; padding: 0.75pt">&nbsp;</TD></TR>
<TR STYLE="background-color: white">
    <TD STYLE="vertical-align: top; font: 10pt/115% Calibri, Helvetica, Sans-Serif; padding-top: 0.75pt; padding-right: 0.75pt; padding-left: 0.75pt; text-align: center"><FONT STYLE="font: 10pt Times New Roman, Times, Serif"><B><U>Votes For</U></B></FONT></TD>
    <TD STYLE="vertical-align: bottom; padding: 0.75pt">&nbsp;</TD>
    <TD STYLE="vertical-align: top; font: 10pt/115% Calibri, Helvetica, Sans-Serif; padding-top: 0.75pt; padding-right: 0.75pt; padding-left: 0.75pt; text-align: center"><FONT STYLE="font: 10pt Times New Roman, Times, Serif"><B><U>Votes Against</U></B></FONT></TD>
    <TD STYLE="vertical-align: bottom; padding: 0.75pt">&nbsp;</TD>
    <TD STYLE="vertical-align: top; font: 10pt/115% Calibri, Helvetica, Sans-Serif; padding-top: 0.75pt; padding-right: 0.75pt; padding-left: 0.75pt; text-align: center"><FONT STYLE="font: 10pt Times New Roman, Times, Serif"><B><U>Votes Abstained</U></B></FONT></TD>
    <TD STYLE="vertical-align: bottom; padding: 0.75pt">&nbsp;</TD>
    <TD STYLE="vertical-align: top; font: 10pt/115% Calibri, Helvetica, Sans-Serif; padding-top: 0.75pt; padding-right: 0.75pt; padding-left: 0.75pt; text-align: center"><FONT STYLE="font: 10pt Times New Roman, Times, Serif"><B><U>Broker Non-Votes</U></B></FONT></TD></TR>
<TR STYLE="vertical-align: bottom; background-color: white">
    <TD STYLE="font: 10pt/115% Calibri, Helvetica, Sans-Serif; padding-top: 0.75pt; padding-right: 0.75pt; padding-left: 0.75pt; text-indent: 0.5in"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">7,859,788</FONT></TD>
    <TD STYLE="padding: 0.75pt">&nbsp;</TD>
    <TD STYLE="font: 10pt/115% Calibri, Helvetica, Sans-Serif; padding-top: 0.75pt; padding-right: 0.75pt; padding-left: 0.75pt; text-indent: 48pt"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">344,036</FONT></TD>
    <TD STYLE="padding: 0.75pt">&nbsp;</TD>
    <TD STYLE="font: 10pt/115% Calibri, Helvetica, Sans-Serif; padding-top: 0.75pt; padding-right: 0.75pt; padding-left: 0.75pt; text-indent: 53.25pt"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">96,883</FONT></TD>
    <TD STYLE="padding: 0.75pt">&nbsp;</TD>
    <TD STYLE="font: 10pt/115% Calibri, Helvetica, Sans-Serif; padding-top: 0.75pt; padding-right: 0.75pt; padding-left: 0.75pt; text-indent: 59.25pt"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">0</FONT></TD></TR>
</TABLE>
<P STYLE="font: bold 12pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-align: center">&nbsp;</P>


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<P STYLE="font: 10pt/normal Times New Roman, Times, Serif; margin: 0 0 12pt"><B>Item 9.01.&#9;Financial Statements and Exhibits.</B></P>

<P STYLE="font: 10pt/normal Times New Roman, Times, Serif; margin: 0 0 12pt; text-indent: 0.5in">(d)&#9;Exhibits:</P>

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<TR STYLE="vertical-align: top">
    <TD NOWRAP STYLE="padding-right: 5.4pt; padding-left: 5.4pt">
        <P STYLE="font: 10pt/normal Times New Roman, Times, Serif; margin: 0; border-bottom: black 0.75pt solid"><B>Exhibit&nbsp;No.</B></P></TD>
    <TD STYLE="padding-right: 5.4pt; padding-left: 5.4pt; font: 10pt/115% Calibri, Helvetica, Sans-Serif">&nbsp;</TD>
    <TD STYLE="padding-right: 5.4pt; padding-left: 5.4pt">
        <P STYLE="font: 10pt/normal Times New Roman, Times, Serif; margin: 0; border-bottom: black 0.75pt solid"><B>Description</B></P></TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="padding-right: 5.4pt; padding-left: 5.4pt; font: 10pt/115% Calibri, Helvetica, Sans-Serif">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="padding-right: 5.4pt; padding-left: 5.4pt; font: 10pt/115% Calibri, Helvetica, Sans-Serif">&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD NOWRAP STYLE="padding-right: 4pt; font: 10pt/115% Calibri, Helvetica, Sans-Serif; text-align: right"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">2.1</FONT></TD>
    <TD STYLE="padding-right: 5.4pt; padding-left: 5.4pt; font: 10pt/115% Calibri, Helvetica, Sans-Serif">&nbsp;</TD>
    <TD STYLE="padding-right: 5.4pt; padding-left: 5.4pt">
        <P STYLE="font: 10pt/normal Times New Roman, Times, Serif; margin: 0">Agreement and Plan of Merger, dated as of December 12, 2013,
        by and among Sonus Networks, Inc., Purple Acquisition Subsidiary, Inc. and Performance Technologies, Incorporated (incorporated
        herein by reference to Exhibit 2 to PT&rsquo;s Current Report on Form 8-K filed with the Securities and Exchange Commission on
        December 13, 2013).</P>
        <P STYLE="font: 10pt/normal Times New Roman, Times, Serif; margin: 0">&nbsp;</P></TD></TR>
<TR STYLE="vertical-align: top">
    <TD NOWRAP STYLE="padding-right: 4pt; font: 10pt/115% Calibri, Helvetica, Sans-Serif; text-align: right"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">3.1</FONT></TD>
    <TD STYLE="padding-right: 5.4pt; padding-left: 5.4pt; font: 10pt/115% Calibri, Helvetica, Sans-Serif">&nbsp;</TD>
    <TD STYLE="padding-right: 5.4pt; padding-left: 5.4pt; font: 10pt/115% Calibri, Helvetica, Sans-Serif"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">Amended and Restated Certificate of Incorporation of Performance Technologies, Incorporated.</FONT></TD></TR>
<TR STYLE="vertical-align: top">
    <TD NOWRAP STYLE="padding-right: 4pt; font: 10pt/115% Calibri, Helvetica, Sans-Serif; text-align: right">&nbsp;</TD>
    <TD STYLE="padding-right: 5.4pt; padding-left: 5.4pt; font: 10pt/115% Calibri, Helvetica, Sans-Serif">&nbsp;</TD>
    <TD STYLE="padding-right: 5.4pt; padding-left: 5.4pt; font: 10pt/115% Calibri, Helvetica, Sans-Serif">&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD NOWRAP STYLE="padding-right: 4pt; font: 10pt/115% Calibri, Helvetica, Sans-Serif; text-align: right"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">3.2</FONT></TD>
    <TD STYLE="padding-right: 5.4pt; padding-left: 5.4pt; font: 10pt/115% Calibri, Helvetica, Sans-Serif">&nbsp;</TD>
    <TD STYLE="padding-right: 5.4pt; padding-left: 5.4pt">
        <P STYLE="font: 10pt/normal Times New Roman, Times, Serif; margin: 0">By-Laws of Performance Technologies, Incorporated.</P>
        <P STYLE="font: 10pt/normal Times New Roman, Times, Serif; margin: 0">&nbsp;</P></TD></TR>
</TABLE>

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    <DIV STYLE="page-break-before: always; margin-top: 6pt"><TABLE CELLPADDING="0" CELLSPACING="0" STYLE="width: 100%"><TR><TD STYLE="text-align: center; width: 100%">&nbsp;</TD></TR></TABLE></DIV>
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<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-align: center">SIGNATURE</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 12pt; text-indent: 0.5in">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 hereunto duly authorized.</P>

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<TR STYLE="vertical-align: top">
    <TD COLSPAN="3" STYLE="font: 10pt/115% Calibri, Helvetica, Sans-Serif; padding-left: 3in"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">Performance Technologies, Incorporated</FONT></TD></TR>
<TR STYLE="vertical-align: top">
    <TD COLSPAN="3" STYLE="font: 10pt/115% Calibri, Helvetica, Sans-Serif; padding-right: 5.4pt; padding-bottom: 10pt; padding-left: 5.4pt">&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="width: 40%; padding-right: 5.4pt; padding-left: 5.4pt; font: 10pt/115% Calibri, Helvetica, Sans-Serif"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">Date:
    February 19, 2014</FONT></TD>
    <TD STYLE="width: 9%"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">By</FONT></TD>
    <TD STYLE="width: 51%; padding-right: 5.4pt; padding-left: 0pt; font: 10pt/115% Calibri, Helvetica, Sans-Serif; text-align: left; border-bottom: Black 1pt solid"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">/s/Jeffrey M. Snider</FONT></TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="font: 10pt/115% Calibri, Helvetica, Sans-Serif; padding-right: 5.4pt">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD STYLE="font: 10pt/115% Calibri, Helvetica, Sans-Serif; padding-right: 5.4pt; padding-left: 0pt; text-align: left">&nbsp;&nbsp;<FONT STYLE="font-family: Times New Roman, Times, Serif">&nbsp;&nbsp;Jeffrey
    M. Snider</FONT></TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="font: 10pt/115% Calibri, Helvetica, Sans-Serif; padding-right: 5.4pt">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD STYLE="font: 10pt/115% Calibri, Helvetica, Sans-Serif; padding-right: 5.4pt; padding-left: 0pt; text-align: left">&nbsp;&nbsp;&nbsp;<FONT STYLE="font-family: Times New Roman, Times, Serif">&nbsp;Secretary</FONT></TD></TR>
<TR STYLE="vertical-align: top">
    <TD COLSPAN="3" STYLE="font: 10pt Times New Roman, Times, Serif; padding-right: 5.4pt; padding-left: 3in">&nbsp;</TD></TR>
</TABLE>
<P STYLE="font: 12pt/normal Times New Roman, Times, Serif; margin: 0 0 0 3in; text-indent: 0.5in">&nbsp;</P>



<P STYLE="margin: 0"></P>

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{"company-data": {"conformed-name": "PERFORMANCE TECHNOLOGIES INC \\DE\\", "cik": "0001003950", "assigned-sic": "3576", "irs-number": "161158413", "state-of-incorporation": "DE", "fiscal-year-end": "1214"}, "filing-values": {"form-type": "8-K", "act": "34", "file-number": "000-27460", "film-number": "14623976"}, "business-address": {"street1": "140 CANAL VIEW BOULEVARD", "city": "ROCHESTER", "state": "NY", "zip": "14623", "phone": "5852560200"}, "mail-address": {"street1": "140 CANAL VIEW BOULEVARD", "city": "ROCHESTER", "state": "NY", "zip": "14623"}}
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
Date of Report (Date of earliest event reported):
February 18, 2014
Performance
Technologies, Incorporated
(Exact Name of Registrant as Specified in its Charter)
Delaware
0-27460
16-1158413
(State or Other Jurisdiction
of Incorporation)
(Commission
File Number)
(IRS Employer
Identification No.)
140 Canal View Boulevard, Rochester, New York 14623
(Address of Principal Executive Offices) (Zip Code)
(585) 256-0200
(Registrant's telephone number, including area code)
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))
Introduction.
On February 19, 2014, pursuant to the
Agreement and Plan of Merger (the "Merger Agreement"), dated as of December 12, 2013, by and among Sonus Networks,
Inc. ("Sonus"), Purple Acquisition Subsidiary, Inc. ("Merger Sub") and Performance Technologies, Incorporated
("PT"), Merger Sub merged with and into PT with PT surviving and becoming a wholly-owned subsidiary of Sonus (the "Merger").
PT's stockholders adopted the Merger Agreement at a special meeting of stockholders held on February 18, 2014. Terms not
otherwise defined herein shall have the meanings ascribed to them in the Merger Agreement.
Item 2.01	Completion of Acquisition or Disposition
of Assets.
At 12:01 a.m. on February 19, 2014 (the
"Effective Time"), each share of PT's common stock, par value $0.01 per share, issued and outstanding immediately
prior to the Effective Time was cancelled and converted automatically into the right to receive $3.75 in cash (the "Merger
Consideration"), except with respect to shares of PT common stock held by any holder who properly exercised appraisal rights
of such shares in accordance with Section 262 of the Delaware General Corporate Law ("DGCL"). All shares of PT common
stock owned by Sonus, Merger Sub or PT were automatically cancelled, and no payment was made with respect thereto.
Holders of vested PT stock options with
an exercise price less than $3.75 were permitted to conditionally exercise such vested stock options, which exercise was effective
at the Effective Time. PT option holders that elected to participate in the conditional option exercise are entitled to receive
a cash payment equal to $3.75 for each share underlying their PT stock options, less the amount of the applicable exercise price
and any required tax withholdings.
In addition, at the Effective Time of
the Merger, Sonus assumed all of the then outstanding stock options under the Company's 2001 Stock Option Plan, 2003 Omnibus
Incentive Plan and 2012 Omnibus Incentive Plan (the "Assumed Options"), but will substitute shares of Sonus's
common stock for shares of PT's common stock issuable upon exercise of the Assumed Options based on the Equity Award Exchange
Ratio articulated in the Merger Agreement. Sonus will also assume PT's 2003 Omnibus Incentive Plan and 2012 Omnibus Incentive
Plan, but will substitute shares of Sonus's common stock for shares of PT's common stock issuable under such plans.
As a result of the Merger, former PT
stockholders will receive Merger Consideration in the aggregate amount of approximately $44 million.
The foregoing summary does not purport
to be complete and is qualified in its entirety by reference to the Merger Agreement, a copy of which was filed as Exhibit 2 to
PT's Current Report on Form 8-K filed with the Securities and Exchange Commission (the "SEC") on December 13,
2013 and is incorporated into this Item 2.01 by reference.
Item 3.01	Notice of Delisting or Failure to Satisfy
a Continued Listing Rule or Standard; Transfer of Listing.
On February 19, 2014, PT requested that
NASDAQ suspend PT's common stock from trading on the NASDAQ Global Market due to the Closing of the Merger. In connection
with PT's request, PT expects that NASDAQ will file a Form 25 with the SEC to notify the SEC of PT's removal from listing
and registration under Section 12(b) of the Securities Exchange Act of 1934. PT expects that Sonus will file a Form 15 with the
SEC after effectiveness of the Form 25 to suspend PT's reporting requirements under Sections 13 and 15(d) of the Securities
Exchange Act of 1934.
Item 3.03	Material Modification to Rights of Security
Holders.
See Item 2.01 of this Current Report
on Form 8-K, which is incorporated into this Item 3.03 by reference.
Item 5.01	Changes in Control.
As described under Item 2.01 of this
Current Report on Form 8-K, which is incorporated into this Item 5.01 by reference, upon the Closing of the Merger on February
19, 2014, a change in control of PT occurred, such that PT now is a wholly-owned subsidiary of Sonus. The Merger Consideration
is being funded by Sonus through Sonus's existing cash on hand and cash acquired from PT.
Item 5.02	Departure of Directors or Certain Officers;
Election of Directors; Appointment of Certain Directors; 		Compensatory Arrangements for Certain Officers.
Pursuant to the Merger Agreement, Dennis
C. Connors, Charles E. Maginness, Stuart B. Meisenzahl, John M. Slusser and Robert L. Tillman resigned from their positions on
PT's board of directors and any committees thereof effective as of the Effective Time. In addition, PT's President
and Chief Executive Officer, John M. Slusser; Senior Vice President and Chief Financial Officer, Dorrance W. Lamb; Senior Vice
President - Sales, Marketing and Services, J. Patrick Rice; and Senior Vice President - Products and Technology, John J. Grana also
resigned in their capacities as officers of PT effective as of the Closing of the Merger. As provided in the Merger Agreement,
Mark T. Greenquist and Jeffrey M. Snider, the directors of the Merger Sub immediately prior to the Effective Time, and Raymond
P. Dolan, Mark T. Greenquist and Jeffrey M. Snider, the officers of the Merger Sub immediately prior to the Effective Time, will
be the initial directors and officers, respectively, of PT as the surviving corporation, in each case until their successors are
elected or designated and qualified, or until their earlier death, resignation or removal from office.
Item 5.03	Amendments to Articles of Incorporation or
Bylaws; Change in Fiscal Year.
Upon the Effective Time, PT's Certificate
of Incorporation was amended and restated in its entirety. Pursuant to the Merger Agreement, the By-Laws of the Merger Sub in effect
immediately prior to the Effective Time became the By-Laws of PT as the surviving corporation. Copies of the Amended and Restated
Certificate of Incorporation and the By-Laws of PT are filed herewith as Exhibits 3.1 and 3.2, respectively.
Item 5.07	Submission of Matters to a Vote of Security
Holders.
On February 18, 2014, PT held a special
meeting of PT stockholders in connection with the Merger (the "Special Meeting"). At the Special Meeting, PT stockholders
present in person or by proxy adopted the Merger Agreement, based on the following votes:
Votes For
Votes Against
Votes Abstained
Broker Non-Votes
8,164,586
135,921
200
0
At the Special Meeting, PT stockholders
present in person or by proxy approved a non-binding, advisory proposal regarding the compensation that may become payable to
PT's named executive officers in connection with the completion of the Merger, based on the following votes:
Votes For
Votes Against
Votes Abstained
Broker Non-Votes
7,526,986
301,598
472,123
0
At the Special Meeting, PT stockholders
present in person or by proxy also approved the adjournment of the Special Meeting, if necessary or appropriate, to solicit additional
proxies if there were not sufficient votes to approve the preceding proposal, based on the following votes:
Votes For
Votes Against
Votes Abstained
Broker Non-Votes
7,859,788
344,036
96,883
0
Item 9.01.	Financial Statements and Exhibits.
(d)	Exhibits:
Exhibit No.
Description
2.1
Agreement and Plan of Merger, dated as of December 12, 2013,
        by and among Sonus Networks, Inc., Purple Acquisition Subsidiary, Inc. and Performance Technologies, Incorporated (incorporated
        herein by reference to Exhibit 2 to PT's Current Report on Form 8-K filed with the Securities and Exchange Commission on
        December 13, 2013).
3.1
Amended and Restated Certificate of Incorporation of Performance Technologies, Incorporated.
3.2
By-Laws of Performance Technologies, Incorporated.
SIGNATURE
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 hereunto duly authorized.
Performance Technologies, Incorporated
Date:
    February 19, 2014
By
/s/Jeffrey M. Snider
Jeffrey
    M. Snider
Secretary