SOURCE: Spirent Communications PLC

March 15, 2007 12:01 ET

Spirent Communications PLC - Director/PDMR Shareholding

Crawley, UK -- (MARKET WIRE) -- March 15, 2007 --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

MR ALEX WALKER

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

ALSO RELATES TO MRS ELIZABETH WALKER

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

JOINT BENEFICIAL HOLDING WITH HIS WIFE REFERRED TO ABOVE

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

NY NOMINEES

8 State the nature of the transaction

PURCHASE OF SHARES IN THE MARKET

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

30,000 ORDINARY SHARES OF 3&1/3 PENCE

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

0.003%

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

N/A

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

N/A

13. Price per share or value of transaction

60 PENCE PER SHARE

14. Date and place of transaction

14 MARCH 2007, LONDON

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

30,000 SPIRENT COMMUNICATIONS PLC ORDINARY SHARES OF 3&1/3 PENCE (0.003% OF THE ISSUED SHARE CAPITAL EXCLUDING TREASURY SHARES)

16. Date issuer informed of transaction

14 MARCH 2007

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

17 Date of grant

N/A

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

N/A

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

N/A

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

N/A

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

N/A

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

N/A

23. Any additional information

24. Name of contact and telephone number for queries

WARREN NASH

Tel: 01293 767676

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

WARREN NASH, SHARE PLANS MANAGER

Date of notification

15 MARCH 2007

END

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