Spirent Communications Plc : - Total Voting Rights

SPIRENT COMMUNICATIONS PLC

TOTAL VOTING RIGHTS AND CAPITAL

London, UK - 3 January 2012: Spirent Communications plc ("the Company") (LSE: SPT), a leading communications technology company, would like to notify the market in accordance with the Financial Services Authority's ("FSA") Disclosure and Transparency Rules of the following information as at 31 December 2011:

The Company's issued share capital consisted of 664,047,878 Ordinary Shares of 3 & 1/3 pence each with each share carrying the right to one vote.  The Company holds no Ordinary Shares in Treasury. Therefore, the total number of voting rights in the Company was 664,047,878.

The above figure may be used by shareholders as the denominator for the calculations by which they will determine if they are required to notify their interest in, or a change to their interest in, the Company under the FSA's Disclosure and Transparency Rules.  Any such notifications should be sent by fax to [phone] or by email [e-mail] for the attention of the Company Secretary.

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Enquiries

Rachel Whiting                          Spirent Communications plc                   [phone]

Company Secretary

About Spirent Communications plc

Spirent Communications plc is a global leader in test and measurement inspiring innovation within development labs, communication networks and IT organisations.  We enable today's communication ecosystem as well as tomorrow's emerging enterprises to deploy life enriching communications networks, devices, services and applications.  The Systems group develops sophisticated power control systems for electrical vehicles in the medical mobility and industrial markets.  Further information about Spirent Communications plc can be found at .

Spirent Communications plc Ordinary Shares are traded on the London Stock Exchange (ticker: SPT).  The Company operates a Level 1 American Depositary Receipt ("ADR") programme with each ADR representing four Spirent Communications plc Ordinary Shares.  The ADRs trade in the US over-the-counter ("OTC") market under the symbol SPMYY and the CUSIP number is 84856M209.  Spirent ADRs are quoted on the Pink OTC Markets electronic quotation service which can be found at .

Spirent and the Spirent logo are trademarks or registered trademarks of Spirent Communications plc.  All other trademarks or registered trademarks mentioned herein are held by their respective companies.  All rights reserved.

Cautionary statement regarding forward-looking statements

This document may contain forward-looking statements which are made in good faith and are based on current expectations or beliefs, as well as assumptions about future events.  You can sometimes, but not always, identify these statements by the use of a date in the future or such words as "will", "anticipate", "estimate", "expect", "project", "intend", "plan", "should", "may", "assume" and other similar words.  By their nature, forward-looking statements are inherently predictive and speculative and involve risk and uncertainty because they relate to events and depend on circumstances that will occur in the future.  You should not place undue reliance on these forward-looking statements, which are not a guarantee of future performance and are subject to factors that could cause our actual results to differ materially from those expressed or implied by these statements.  The Company undertakes no obligation to update any forward-looking statements contained in this document, whether as a result of new information, future events or otherwise.