(19)
(11) EP 1 166 244 A1

(12)

(43) Date of publication:
02.01.2002 Bulletin 2002/01

(21) Application number: 00909506.8

(22) Date of filing: 14.03.2000
(51) International Patent Classification (IPC)7G08B 13/14, H04L 12/28
(86) International application number:
PCT/GB0000/920
(87) International publication number:
WO 0057/375 (28.09.2000 Gazette 2000/39)
(84) Designated Contracting States:
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE

(30) Priority: 19.03.1999 EP 99302149

(71) Applicant: BRITISH TELECOMMUNICATIONS public limited company
London EC1A 7AJ (GB)

(72) Inventors:
  • REEDER, Stephen, Michael
    Milton Keynes,Buckinghamshire, MK4 1LX (GB)
  • BRADLEY, David, William
    Felixstowe,Suffolk IP11 2BP (GB)

(74) Representative: Nash, Roger William et al
BT Group Legal Services, Intellectual Property Department, Holborn Centre, 8th Floor, 120 Holborn
London EC1N 2TE
London EC1N 2TE (GB)

   


(54) SECURITY SYSTEMS