SSH TBR 002:1997

Digital Terminals and Access (DTA); Attachment requirements for Data Terminal Equipment (DTE) to connect to Packet Switched Public Data Networks (PSPDNs) for CCITT Recommendation X.25 interfaces at data signalling rates up to 1 920 kbit/s utilizing interfaces derived from CCITT Recommendations X.21 and X.21 bis

Scope

This Technical Basis for Regulation (TBR) specifies the technical characteristics (electrical and mechanical interface requirements) and access control protocol to be provided by packet mode terminal equipment intended for connection to a dedicated interface of a Packet Switched Public Data Network (PSPDN) using CCITT Recommendation X.25 [1], [2] and [3] making use of Link Access Procedure Balanced (Modulo 8 operation) (LAPB) and Link Access Procedure Balanced (Modulo 128 operation) (LAPB Extended) modes of operation. The objective of this TBR is to ensure that no disturbance occurs to the public network, and to ensure interworking between network and terminal, but without any guarantee of terminal operation and end to end operability across networks.