This Recommendation specifies usage of the Broadband ISDN User Part protocol to support the
establishment, maintenance and clearing of B-ISDN call/connections which support Frame Relay
service at the Network-Node Interface.
It defines:
¿ specific message and parameter codings needed for Frame Relay call/connections;
¿ use of primitives and primitive parameters needed to model Frame Relay call/connections
according to the specification model for the B-ISDN User Part;
¿ related Application Process procedures;
¿ impact on the Application Service Element; and
¿ interworking with DSS 2, as specified in Recommendation Q.2933.
The case described in this Recommendation is an end-to-end B-ISDN connection between B-ISDN
users, where the protocol in use over the user plane connection is the Frame Relay Service Specific
Convergence Sublayer (FR-SSCS).
The B-ISDN Frame Relay service has the following characteristics:
1) it provides bidirectional transfer of Service Data Units across the network with order
preserved;
2) the U-plane procedures use the service provided by AAL Type 5 common part on a Virtual
Channel Connection (VCC) basis and the Frame Relay SSCS above it. Multiplexing of
multiple Frame Relay data link connections uniquely identified by the Data Link Connection
Identifier may be performed at the FR-SSCS level.