Transaction in Own Shares

Spirent Communications PLC
13 September 2006


Spirent Communications plc announces that on 13 September 2006 it purchased from
JPMorgan Cazenove Limited 500,000 Spirent Communications plc ordinary shares at
an average price of 46.9888 pence per share. The purchased shares will be held
as treasury shares. Following the above purchase, Spirent Communications plc
holds 59,040,000 Spirent Communications plc ordinary shares in treasury, and has
912,980,762 Spirent Communications plc ordinary shares in issue (excluding
treasury shares).




                      This information is provided by RNS
            The company news service from the London Stock Exchange