Transaction in Own Shares

Spirent Communications PLC
05 September 2007


Spirent Communications plc: Transaction in own shares

Spirent Communications plc announces that it has today purchased through ABN
AMRO Bank NV 5,000,000 ordinary shares at a price of 64.25 pence per share.
Spirent Communications plc intends to hold the purchased shares in treasury.

Following the purchase of these shares, Spirent Communications plc holds
84,575,000 of its ordinary shares in treasury and has 879,594,967 ordinary
shares in issue (excluding treasury shares). This figure (879,594,967)
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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