The present document specifies requirements for the ISDN basic rate UNI including the physical, electrical and functional characteristics and the information exchange with higher layers. This ensures that interface implementations in an ISDN equipment for use with ISDN basic access is portable within Europe with regard to layer 1 interface aspects and that interworking with higher layer protocols for ISDN is supported.
The present document is applicable to equipment having interface IA or IB for the connection to the ISDN basic access
intended to be installed on customer premises according to ITU-T Recommendation I.411 [9], the present document is
for application to interfaces at reference points S, T and S/T (coincident S and T) of the ISDN reference configuration.
For the case where the present document is applied to the T and the S/T reference point, the main body of the part 1 and
the parts 6 and 7 are normative.
For the case where the present document is applied to the S reference point, annex A to this part 1 is also normative.
The present document does not specify:
safety requirements;
interface or equipment overvoltage protection requirements;
immunity requirements against electromagnetic interference;
emission limitation requirements.