Transaction in Own Shares

Spirent Communications PLC
30 June 2006



Spirent Communications plc announces that they have put in place an irrevocable,
non-discretionary programme allowing the buy back of Spirent Communications plc
shares during the close period which precedes the interim results announcement
on 10th August 2006. Any purchases pursuant to these arrangements will be
effected during the period between 3rd July 2006 and 10th August 2006 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. In announcing this
Spirent Communications plc confirms that currently it has no unpublished price
sensitive information.


END.


                      This information is provided by RNS
            The company news service from the London Stock Exchange