DATA LINK SERVICE DEFINITION FOR OPEN SYSTEMS INTERCONNECTION
FOR CCITT APPLICATIONS1
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1 Recommendation X.212 and ISO 8886, Information processing systems - Data
communications - Data link service definition, were developed in close
collaboration and are technically aligned, except for the differences noted in
Appendix I.
1. Appendix II to this Recommendation, which describes the relationship between
connection-mode and connectionless-mode operation, is not present in ISO 8886.
2. Appendix III to this Recommendation, which defines a method for providing the
OSI connection-mode data link service using X.25 LAPB compatible DTE procedures, is
not present in ISO 8886.
The addresses referred to in Table II/X.212 are DKSAP addresses. The
connection-mode and connectionless-mode DLSs may both use the same
DLSAP-addresses.
Note - If the configuration allows any of these addresses to be known by the
DLEntity on an a priori basis, then these DLSAP addresses need not explicitly be
conveyed in the protocol.
III.2 References
In addition to the references identified in section 2 of this Recommendation
the following references are applicable to this Appendix:
Recommendation X.25 Interface between Data Terminal Equipment (DTE) and Data Circuit-
terminating Equipment (DCE) for terminals operating in the packet
mode and connected to public data networks by dedicated circuit.
Recommendation X.75Packet-switched Signalling System between public networks
providing data transmission services.
ISO 7776 Information processing systems - Data Communications -
high-level Data Link Control procedure - description of the X.25
LAPB-compatible DTE Data Link procedures.
