SOURCE: Spirent Communications PLC

August 22, 2006 09:15 ET

Spirent Communications PLC announces Director/PDMR Shareholding

Crawley, UK -- (MARKET WIRE) -- August 22, 2006 --

                       SPIRENT COMMUNICATIONS PLC
                             (the "Company")

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

The Company was notified on 22 August 2006 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

15,002                                      41 pence

6,371                                       38 pence
Following this transfer the total number of Ordinary shares held by the Trust is:

2,165,179 (representing 0.2334% 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.

Michael Anscombe

Deputy Company Secretary

Spirent Communications plc

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