This first part of EN 301 486 specifies the signalling protocol for ATM Traffic Descriptor modification with negotiation for the Broadband Integrated Services Digital Network (B-ISDN) at the TB reference point or coincident SB and TB reference point (as defined in Recommendation I.413 [1]) by means of the Digital Subscriber Signalling System No. 2 (DSS2). The present document extends the ATM Traffic Descriptor modification capability specified in EN 301 276-1 [11] to support the traffic parameter negotiation which is equivalent to that specified in EN 301 067-1 [9].
In addition, the present document specifies the protocol, requirements at the TB reference point where the service is provided to the user via a private B-ISDN. The capability described in the present document enables the connection owner to modify the ATM Traffic Descriptor with negotiation for call/connections that have already been established as specified in EN 301 068-1 [8]. The present document specifies the procedure of the modification with negotiation of PCR, SCR and MBS using either an Alternative ATM traffic descriptor information element or a Minimum acceptable ATM traffic descriptor information element.
ATM Traffic Descriptor modification with negotiation is applicable to all connection oriented Telecommunication services that are based on single point-to-point calls/connections, however, modification is not applicable to emulated N-ISDN services. The ATM Traffic Descriptor modification with negotiation for point-to-multipoint calls/connections is outside the scope of the present document.
The present document is applicable to equipment, supporting ATM Traffic Descriptor modification with negotiation, to be attached at either side of a TB reference point or coincident SB and TB reference point when used as an access to the public B-ISDN.
Further parts of the present document provide the method of testing and detailed application specific (...abbreviated)