Transaction in Own Shares

Spirent Communications PLC
22 October 2007


Spirent Communications plc: Transaction in own shares


Spirent Communications plc announces that it has today purchased through UBS
Limited 1,000,000 ordinary shares at an average price of 64.0 pence per share.
The highest price and the lowest price paid for these shares were 65.5 pence and
62.3 pence respectively.


Spirent Communications plc intends to hold the purchased shares in treasury.


Following the purchase of these shares, Spirent Communications plc holds
36,844,359 of its ordinary shares in treasury and has 853,393,079 ordinary
shares in issue (excluding treasury shares).  This figure (853,393,079)
represents the total voting rights in the Company and may be used by
shareholders as the denominator for the calculations by which they can determine
if they are required to notify their interest in, or a change to their interest
in, the Company under the Financial Services Authority's Disclosure and
Transparency Rules.


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