Transaction in Own Shares

Spirent Communications PLC
15 May 2006




Spirent Communications plc announces that on 15 May 2006 it purchased from
JPMorgan Cazenove Limited 1,000,000 Spirent Communications plc ordinary shares
at an average price of 46.21 pence per share. The purchased shares will be held
as treasury shares. Following the above purchase, Spirent Communications plc
holds 1,000,000 Spirent Communications plc ordinary shares in treasury, and has
969,326,853 Spirent Communications plc ordinary shares in issue (excluding
treasury shares).




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