The present document specifies requirements and test principles for the ISDN 2 048 kbit/s primary rate UNI including the physical, electrical and functional characteristics and the information exchange with higher layers. Compliance with the present document ensures that, with regard to layer 1 interface aspects, equipment for use with ISDN primary rate access is portable within countries that adhere to the present document and, furthermore, 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 primary rate
UNI intended to be installed on customers premises. In accordance with ITU-T Recommendation I.411 [1], the present
document is to be applied to interfaces at reference points S, T and S/T (coincident S and T) of the ISDN reference configuration.
The present document is applicable for ISDN channel arrangements as defined in ITU-T Recommendation I.412 [2], as far as the primary rate at 2 048 kbit/s is concerned.
Annex A specifies additional requirements for interfaces at reference point S.
The present document does not specify:
safety requirements;
interface or equipment overvoltage protection requirements;
immunity requirements against electromagnetic interferences;
emission limitation requirements.