SOURCE: Spirent Communications PLC

September 20, 2006 12:54 ET

Spirent Communications PLC announces Transaction in Own Shares

Crawley, UK -- (MARKET WIRE) -- September 20, 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 800,000 ordinary shares at an
average price of  47.37 pence per share. The highest price and the lowest price
paid for these shares were  47.5 pence and  47.0 pence respectively.

Following the above purchase, Spirent Communications plc holds 63,640,000
Spirent Communications plc ordinary shares in treasury, and has 908,415,762
Spirent Communications plc ordinary shares in issue (excluding treasury shares).


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