Transaction in Own Shares

Spirent Communications PLC
05 September 2006





Spirent Communications plc announces that on 5 September 2006 it purchased from
JPMorgan Cazenove Limited 750,000 Spirent Communications plc ordinary shares at
an average price of 46.2782 pence per share. The purchased shares will be held
as treasury shares. Following the above purchase, Spirent Communications plc
holds 54,740,000 Spirent Communications plc ordinary shares in treasury, and has
917,235,554 Spirent Communications plc ordinary shares in issue (excluding
treasury shares).




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