UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

Form 10-Q/A

for the quarterly period ended June 30, 2012

or

for the transition period from              to             

Commission File Number 0-25996

TRANSWITCH CORPORATION

(Exact name of Registrant as Specified in its Charter)

3 Enterprise Drive

Shelton, Connecticut 06484

(Address of Principal Executive Offices)

(203) 929-8810

(Registrant’s telephone number, including area code)

Indicate by check mark whether the Registrant: (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the Registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. Yes    S    No    £

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).

Yes   S     No    £

Indicate by check mark whether the Registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company. See definition of “large accelerated filer,” “accelerated filer” and “smaller reporting company” in Rule 12b-2 of the Exchange Act.

Large Accelerated Filer £  Accelerated Filer S  

Non-Accelerated Filer (Do not check if a smaller reporting company) £ Smaller Reporting Company S

Indicate by a check mark whether the Registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act). Yes   £    No    S

At July 31, 2012, there were 34,317,817 shares of Common Stock, par value $.001 per share, of the Registrant outstanding.

Explanatory Note

TranSwitch Corporation (the “Company”) filed its Quarterly Report on Form 10-Q for the fiscal quarter ended June 30, 2012 (“Form 10-Q”) with the Securities and Exchange Commission (the “SEC”) on August 9, 2012.  The Company is filing this amendment to the Form 10-Q (“Form 10-Q/A”) solely to furnish Exhibit 101 to the Form 10-Q in accordance with Rule 405 of Regulation S-T.  Exhibit 101 provides the consolidated financial statements and related footnotes from the Form 10-Q formatted in XBRL (eXtensible Business Reporting Language).  Except as described above, no other changes have been made to the Form 10-Q, and this Form 10-Q/A does not modify or update any other information in the Form 10-Q.  Information not affected by the changes described above is unchanged and reflects the disclosures made at the time the Form 10-Q was filed.  Among other things, forward-looking statements made in the Form 10-Q have not been updated or revised to reflect events, results or developments that have occurred, or facts that have become known to the Company after the date of the Form 10-Q, and such forward-looking statements should be read in their historical context.

Pursuant to Rule 406T of Regulation S-T, the interactive data files in Exhibit 101 hereto are deemed not filed or part of a registration statement or prospectus for purposes of Sections 11 or 12 of the Securities Act of 1933, as amended, are deemed not filed for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, and otherwise are not subject to liability under those sections.

ITEM 6.     EXHIBITS

Exhibit 101.INS XBRL Instance Document ** 

Exhibit 101.SCH XBRL Taxonomy Extension Schema ** 

Exhibit 101.CAL XBRL Extension Calculation Linkbase ** 

Exhibit 101.DEF XBRL Extension Definition Linkbase ** 

Exhibit 101.LAB XBRL Taxonomy Extension Label Linkbase ** 

Exhibit 101.PRE XBRL Taxonomy Extension Presentation Linkbase **

*These exhibits were previously included or incorporated by reference in the Company’s Quarterly Report on Form 10-Q for the period ended June 30, 2012, filed with the Securities and Exchange Commission on August 9, 2012.

**Filed herewith.

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.