(19)

(11)

EP 0 208 705 A1

(12)

(43) Date of publication: 21.01.1987 Bulletin 1987/04 (21) Application number: 86900191.0 (22) Date of filing: 10.12.1985

(51) International Patent Classification (IPC):  H04L 12/ 433( . ) H04L 12/ 64( . ) (86) International application number: PCT/GB1985/000567 (87) International publication number: WO 1986/003640 (19.06.1986 Gazette 1986/13)

(84) Designated Contracting States: AT BE CH DE FR GB IT LI LU NL SE (30) Priority: 10.12.1984 GB 19840031147 (71) Applicant: BEALE INTERNATIONAL TECHNOLOGY LIMITED Wraysbury Middlesex TW19 5NJ (GB)	(72) Inventors: BEALE, Nicholas, Clive, Lansdowne Wraysbury Middlesex TW19 5NJ (GB) GLADSTONE, Philip, John, Steuart Newbury Bucks RG15 0TN (GB) REED, Andrew, Steven Orchard Waye Uxbridge UB8 2BP (GB)