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- Recommendation X.212
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- 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.
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- 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.
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- 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
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- In addition to the references identified in section 2 of this Recommendation
- the following references are applicable to this Appendix:
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- 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.
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- Recommendation X.75Packet-switched Signalling System between public networks
- providing data transmission services.
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- ISO 7776 Information processing systems - Data Communications -
- high-level Data Link Control procedure - description of the X.25
- LAPB-compatible DTE Data Link procedures.
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