Transaction in Own Shares

Spirent Communications PLC
21 August 2006





Spirent Communications plc announces that on 21 August 2006 it purchased from
JPMorgan Cazenove Limited 1,000,000 Spirent Communications plc ordinary shares
at an average price of 47.7778 pence per share. The purchased shares will be
held as treasury shares. Following the above purchase, Spirent Communications
plc holds 43,990,000 Spirent Communications plc ordinary shares in treasury, and
has 927,553,203 Spirent Communications plc ordinary shares in issue (excluding
treasury shares).




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