Spirent Communications PLC announces Director/PDMR Shareholding


Crawley, UK -- (MARKET WIRE) -- January 5, 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

14,565                         38 pence


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


1,838,156 (representing 0.21% 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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