Transaction in Own Shares

Spirent Communications PLC
16 April 2007




Spirent Communications plc
16 April 2007


Spirent Communications plc announces that it has put in place an irrevocable,
non-discretionary programme allowing the buy back of Spirent Communications plc
shares during the prohibited period which precedes the announcement of the
results of the operating and strategic review, with such announcement expected
to be in advance of its Annual General Meeting scheduled for 9 May 2007.

Any purchases pursuant to these arrangements will be effected during the period
between 16 April 2007 and the business day prior to the announcement of the
results of the operating and strategic review, within certain pre-set parameters
and will be in accordance with the company's general authority to repurchase
shares.

Any shares repurchased will be held as Treasury shares.




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