Transaction in Own Shares

Spirent Communications PLC
07 September 2007


Spirent Communications plc: Transaction in own shares

Spirent Communications plc announces that it has today purchased through ABN
AMRO Bank NV 450,000 ordinary shares at an average price of 62.76 pence per
share. The highest price and the lowest price paid for these shares were 63.0
pence  and 61.25 pence respectively.  

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

Following the purchase of these shares, Spirent Communications plc holds
85,025,000 of its ordinary shares in treasury  and has 879,937,477 ordinary
shares in issue (excluding treasury shares). This figure (879,937,477)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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