Crawley, UK -- (MARKET WIRE) -- 10/19/2006 -- 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®(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: 01293 767676

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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