Transaction in Own Shares

Spirent Communications PLC
01 September 2006



Spirent Communications plc announces that on 1 September 2006 it purchased from
JPMorgan Cazenove Limited 1,000,000 Spirent Communications plc ordinary shares
at an average price of 45.9006 pence per share. The purchased shares will be
held as treasury shares. Following the above purchase, Spirent Communications
plc holds 52,990,000 Spirent Communications plc ordinary shares in treasury, and
has 918,985,554 Spirent Communications plc ordinary shares in issue (excluding
treasury shares).


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