This first part of EN 301 003 specifies the signalling protocol for peak cell rate modification for the Broadband
Integrated Services Digital Network (B-ISDN) at the TB reference point or coincident SB and TB reference point (as
defined in ITU-T Recommendation I.413 [1]) by means of the Digital Subscriber Signalling System No. two (DSS2).
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 peak cell rate for
call/connections that have already been established.
Peak cell rate modification 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 peak cell
rate modification for point-to-multipoint calls/connections is outside the scope of the present document.
The present document is applicable to equipment, supporting peak cell rate modification, 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 EN 300 443-1 [4].