SOURCE: Spirent Communications PLC

September 22, 2006 12:44 ET

Spirent Communications PLC announces Transaction in Own Shares

Crawley, UK -- (MARKET WIRE) -- September 22, 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 1,200,000 ordinary shares at an average price of 49.235 pence per share. The highest price and the lowest price paid for these shares were 49.5 pence and 48.0 pence respectively.

Following the above purchase, Spirent Communications plc holds 65,840,000 Spirent Communications plc ordinary shares in treasury, and has 906,290,762 Spirent Communications plc ordinary shares in issue (excluding treasury shares).

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