Transaction in Own Shares

Spirent Communications PLC
07 November 2006

Spirent Communications Plc
Transaction in Own Shares

Spirent Communications PLC announces that it has today purchased through
Citigroup Global Markets U.K. Equity Limited 511,487 ordinary shares at an
average price of 59.523 pence per share. The highest price and the lowest price
paid for these shares were 60.0 pence and 58.75 pence respectively.

Following the above purchase, Spirent Communications plc holds 86,301,487
Spirent Communications plc ordinary shares in treasury, and has 888,368,693
Spirent Communications plc ordinary shares in issue (excluding treasury shares).


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