Director/PDMR Shareholding

Spirent Communications PLC
30 January 2007



                          SPIRENT COMMUNICATIONS PLC
                               (the "Company")


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


The Company was notified on 30 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

32,044                       38 pence


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

1,709,305 (representing 0.193% 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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