scope:

This Technical Basis for Regulation (TBR) specifies the technical requirements under Articles 4 (c) to 4 (f) of Council Directive 91/263/EEC ("The Terminal Equipment Directive") for Terminal Equipment (TE) to be attached to the pan-European Integrated Services Digital Network (ISDN) at an interface at the T reference point or coincident S and T reference point for a primary rate access. These requirements are taken from TBR 4 [8], TBR 13 [9], ETS 300 007 [10], ETS 300 046-3 [12], ETS 300 011 [11], ETS 300 102-1 [13] and ETS 300 125 [14]. This TBR does not contain the essential requirements of Article 4 (g) for interworking via the public network, and so does not provide any guarantee of correct terminal-to-terminal operation.