V-interfaces at the digital local exchange (LE) − V5.2 interface (based on 2048 kbit/s) for the support of access network (AN)
|Publication Date:||1 March 2001|
This Recommendation specifies the electrical, physical, procedural and protocol requirements for the V5.2 interface between an Access Network (AN) and the Local Exchange (LE) for the support of the following access types:
- analogue telephone access;
- ISDN basic access with a line transmission system conforming to ITU-T G.960 for the case with a NT1 separate from the AN;
- ISDN basic access with a user network interface according to ITU-T I.430 at the user side of the AN (i.e. the interface at the T reference point);
- ISDN primary rate access with a line transmission system conforming to ITU-T G.962 for the case with a NT1 separate from the AN;
- ISDN primary rate access with a user network interface according to ITU-T I.431 at the user side of the AN (i.e. the interface at the T-reference point);
- other analogue or digital accesses for semi-permanent connections without associated out-band signalling information,
with flexible information channel (bearer channel) allocation on a call by call basis which provides concentration capability within the AN and over the V5.2 interface. This Recommendation does not specify the implementation of the requirements within the AN and does not constrain any implementation alternative as long as the functionality at the V5.2 interface as specified in this Recommendation is met.
This Recommendation should be used in conjunction with ITU-T G.964. The two Recommendations share a common format and clauses within ITU-T G.964  are referenced in this Recommendation.
A link control capability is provided in order to manage the possible multi-link arrangements within a V5.2 interface. See clause 16.
A protection capability is provided in order to allow the interface to continue functioning in the event of 2048 kbit/s link failures.
Annex A provides an overview of the service scenarios and architecture taken as the conceptual basis for the specification of the V5.2 interface.
Annex B defines the use of the protocol information elements for the definition of the national PSTN protocols and information flow diagrams to the PSTN protocol specification. Annex H provides the definition of the Layer 3 PSTN protocol error detection.
Annex C specifies the basic assumptions of the management function in the LE and the AN to support correct operation and control of the configuration.
Annex D describes the protocol architecture for the ISDN and PSTN user port status control information transfer.
Annex E provides an overview of frame formats used in the V5.2 interface and also the message types allocated to the V5.2 interface.
Annexes F, G and H refer to Annexes F, H and K of ITU-T G.964.
Annex J presents explanatory notes and information flow for the Protection protocol.
Annex K gives information on principles for the BCC protocol application.
Annex L gives examples for an implementation with high interoperability.