SOURCE: Spirent Communications PLC

January 15, 2007 10:44 ET

Spirent Communications PLC announces Director/PDMR Shareholding

Crawley, UK -- (MARKET WIRE) -- January 15, 2007 --

                             SPIRENT COMMUNICATIONS PLC
                                   (the "Company")

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

The Company was notified on 5 January 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

96,807                                           38 pence

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

1,741,349 (representing 0.197% 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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