(19)

(11)

EP 1 106 003 A1

(12)

(43) Date of publication: 13.06.2001 Bulletin 2001/24 (21) Application number: 99940326.4 (22) Date of filing: 16.08.1999

(51) International Patent Classification (IPC)7: H04L 12/56, H04L 12/44 (86) International application number: PCT/GB9902/691 (87) International publication number: WO 0011/841 (02.03.2000 Gazette 2000/09)

(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: 18.08.1998 GB 9818022 09.10.1998 GB 9822113 (71) Applicant: MADGE NETWORKS LIMITED Wexham, Slough SL3 6PJ (GB)	(72) Inventors: KNIGHT, Richard John Nr Henley-on-Thames,Oxon RG9 6PH (GB) COLEMAN, Trevor John Amers ham,Bucks HP7 9BD (GB) (74) Representative: Finnie, Peter John  Gill Jennings & Every,Broadgate House,7 Eldon Street London EC2M 7LH London EC2M 7LH (GB)