Transaction in Own Shares

Spirent Communications PLC
08 September 2006



Spirent Communications plc announces that on 8 September 2006 it purchased from
JPMorgan Cazenove Limited 550,000 Spirent Communications plc ordinary shares at
an average price of 46.268 pence per share. The purchased shares will be held as
treasury shares. Following the above purchase, Spirent Communications plc holds
57,090,000 Spirent Communications plc ordinary shares in treasury, and has
914,893,054 Spirent Communications plc ordinary shares in issue (excluding
treasury shares).




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