SSH EN 301 486-1 V1.1.3:2000

Broadband Integrated Services Digital Network (B-ISDN); Digital Subscriber Signalling System No. two (DSS2) protocol; Connection characteristics; ATM traffic descriptor modification with negotiation by the connection owner; Part 1: Protocol specification [ITU-T Recommendation Q.2963.3, modified]

Scope

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 requirements to
determine conformance to the present document.
The provision of this service requires the support of the protocol for the basic point-to-point call/bearer connections as
defined in the ETS 300 443-1 [7].