Director/PDMR Shareholding

Spirent Communications PLC
19 October 2006


NOTIFICATION OF TRANSACTIONS OF DIRECTORS, PERSONS DISCHARGING MANAGERIAL
RESPONSIBILITY OR CONNECTED PERSONS

This form is intended for use by an issuer to make a RIS notification required
by DR 3.1.4R(1).


(1)      An issuer making a notification in respect of a transaction relating to the shares or debentures
         of the issuer should complete boxes 1 to 16, 23 and 24.


(2)      An issuer making a notification in respect of a derivative relating to the shares of the issuer
         should complete boxes 1 to 4, 6, 8, 13, 14, 16, 23 and 24.


(3)      An issuer making a notification in respect of options granted to a director/person discharging
         managerial responsibilities should complete boxes 1 to 3 and 17 to 24.


(4)      An issuer making a notification in respect of a financial instrument relating to the shares of
         the issuer (other than a debenture) should complete boxes 1 to 4, 6, 8, 9, 11, 13, 14, 16, 23 and
         24.



Please complete all relevant boxes in block capital letters.



1. Name of the issuer



SPIRENT COMMUNICATIONS PLC



2. State whether the notification relates to (i) a transaction notified in
accordance with DR 3.1.4R(1)(a); or

(ii) DR 3.1.4(R)(1)(b) a disclosure made in accordance with section 324 (as
extended by section 328) of the Companies Act 1985; or

(iii) both (i) and (ii)



(iii) THIS NOTIFICATION IS MADE IN ACCORDANCE WITH BOTH



3. Name of person discharging managerial responsibilities/director



ERIC HUTCHINSON



4. State whether notification relates to a person connected with a person
discharging managerial responsibilities/director named in 3 and identify the
connected person



N/A



5. Indicate whether the notification is in respect of a holding of the person
referred to in 3 or 4 above or in respect of a non-beneficial interest



N/A



6. Description of shares (including class), debentures or derivatives or
financial instruments relating to shares



SPIRENT COMMUNICATIONS PLC ORDINARY SHARES OF 3&1/3 PENCE



7. Name of registered shareholders(s) and, if more than one, the number of
shares held by each of them



N/A



8 State the nature of the transaction



SALE OF SHARES ARISING FROM THE EXERCISE OF AN OPTION AWARDED UNDER THE
SPIRENT1995 EXECUTIVE SHARE OPTION SCHEME



9. Number of shares, debentures or financial instruments relating to shares
acquired



N/A



10. Percentage of issued class acquired (treasury shares of that class should
not be taken into account when calculating percentage)



N/A



11. Number of shares, debentures or financial instruments relating to shares
disposed



1,128,000 ORDINARY SHARES OF 3&1/3 PENCE



12. Percentage of issued class disposed (treasury shares of that class should
not be taken into account when calculating percentage)



0.126%



13. Price per share or value of transaction



59.179 PENCE PER SHARE

14. Date and place of transaction



18 OCTOBER 2006



15. Total holding following notification and total percentage holding following
notification (any treasury shares should not be taken into account when
calculating percentage)



871,731 SPIRENT COMMUNICATIONS PLC ORDINARY SHARES OF 3&1/3 PENCE (0.097% OF THE
ISSUED SHARE CAPITAL EXCLUDING TREASURY SHARES)



16. Date issuer informed of transaction



18 OCTOBER 2006



If a person discharging managerial responsibilities has been granted options by
the issuer complete the following boxes



17 Date of grant



25 MARCH 2003



18. Period during which or date on which it can be exercised



25 MARCH 2006 TO 24 MARCH 2013



19. Total amount paid (if any) for grant of the option



NIL



20. Description of shares or debentures involved (class and number)



1,128,000 OPTIONS OVER ORDINARY SHARES OF 3 & 1/3 PENCE EACH



21. Exercise price (if fixed at time of grant) or indication that price is to be
fixed at the time of exercise



16 PENCE PER SHARE



22. Total number of shares or debentures over which options held following
notification



3,494,742 OPTIONS OVER ORDINARY SHARES OF 3 & 1/3 PENCE EACH



23. Any additional information





24. Name of contact and telephone number for queries



WARREN NASH

Tel: [phone]



Name and signature of duly authorised officer of issuer responsible for making
notification



WARREN NASH



Date of notification



19 OCTOBER 2006


END


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