SOURCE: Spirent Communications PLC

March 29, 2007 06:19 ET

Spirent Communications PLC - Director/PDMR Shareholding

Crawley, UK -- (MARKET WIRE) -- March 29, 2007 --

   
                    SPIRENT COMMUNICATIONS PLC
                          (the "Company")



                  NOTIFICATION OF DEEMED INTERESTS
           BY DIRECTORS, PERSONS DISCHARGING MANAGERIAL
                 RESPONSIBILITY OR CONNECTED PERSONS

The Company was notified on 29 March 2007 that Spirent Sharesave Trust Limited, the trustee for the Spirent Sharesave Trust (the "Trust") had transferred Ordinary shares to satisfy the exercise of options under the Company's Savings Related Share Option Scheme as follows:

No of Shares                                     Option Price

7,768                                            38 pence

Following this transfer the total number of Ordinary shares held by the Trust is:

1,637,061 (representing 0.185% of the issued share capital of the Company).

The Company's executive directors are potential beneficiaries of the Trust (together with all other UK employee share option holders) and are, therefore, treated under the Companies Act 1985 as having a deemed interest in the total number of shares held by the Trust. As a result, the directors' deemed interest in the Trust has been reduced by the above number of shares transferred.

For the avoidance of doubt, the Company confirms that this notification does not relate to an actual dealing in securities by the executive directors whose interests in the Company's securities remain unchanged notwithstanding the above events.

Warren Nash
Share Plans Manager
Spirent Communications plc



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