SIS SS-ENV 41 110-1988
Information Systems Interconnection — Local Area Networks — Provision of the OSI Connection-mode Transport Service and the OSI Connectionless-mode Network Service in an End System on a Token Ring LAN in a single or multiple configuration.

Standard No.

SIS SS-ENV 41 110-1988

Release Date

1988

Published By

SE-SIS

Latest

SIS SS-ENV 41 110-1988

Scope

This Functional Standard defines Communications between two End Systems in a single or multiple LAN configuration. Specifically, - Provision of the OSI Connection-mode Transport Service as defined in ISO 8072 between an End System (the "Reference End System") connected to a Token Ring LAN and an End System on the same or another Token Ring LAN, or any other End System accessible through the Network Service provider in the configuration of LANs. - Provision of the OSI Connectionless-mode Network Service as defined in ISO 8348/DAD1 between the Reference End System and the corresponding End System according to ISO/DIS 8880-1 and ISO/DIS 8880-3. Global network layer addressing, as defined in ISO 8348/DAD2, is supported. A System that supports only the protocol set for layers 1-4 specified in this Functional Standard does not satisfy the conformance requirements for the Transport Layer defined in ISO 8073. This functional standard alone does not meet the conditions for a fully open system set out in the addendum to the reference model covering Connectionless-mode transmission, ISO 7498/DAD 1. Note: A prof i le that meets the requirements of a fully open system providing the OSI connection-mode Network Service in an End System attached to a Token Ring LAN is expected to be contained in a future ENV. This Functional Standard specifies a set of protocols, termed a profi le, to provide the function defined above. It does not specify total system capability. In particular, a system may operate this profi le and at the same time engage in other Communications ?ver the medium to which it is connected. The requirements placed on a system in this Functional Standard are soley those necessary for operation of the protocol set specified. Note 1 : Both Functional Standards ENV 41 109 and 41 110 can be applied to single LAN environments. Preference should be given to ENV 41 110 in such cases where extensibility of a configuration is to be envisaged. Note 2 : A system conforming to Functional Standard ENV 41 110 is not thereby precluded from operating according to Functional Standard ENV 41 109 when communicating with another system on the same LAN. This Functional Standard does not specify the Token Ring Wiring System, i.e., trunk coupling units, trunk cables, repeaters and TCU/MIC cable, because the associated base standard ISO/DIS 8802-5 identifies but intentionally does not fully specify these components. International standardization of the Token Ring Wiring System within IS0/IEC JTC 1 is expected in the future. Before completion of the international standardization work it is not possible to give a complete specification of the Token Ring Wiring System. However, clause 10 contains requirements upon the Token Ring Wiring System that are necessary for interworking of attached DTEs. Operation of DTEs with Token Ring Wiring System implementations that do not meet these requirements is outside the scope of this Functional Standard. In addition, because of this lack of standardization, interconnection of different Token Ring Wiring System components to form a single LAN (e.g. to extend the LAN topology) may be restricted due to incompatible components. Annex A, which is not an integral part of this Functional Standard, provides further information on - the design of a TCU - the electrical characteristics of cable types - the planning and installation of a Token Ring Wiring System. Its contents are of an interim nature and are expected to be superseded by the ISO/IEC JTC 1 standardization work mentioned above.

SIS SS-ENV 41 110-1988 history

• 1988 SIS SS-ENV 41 110-1988 Information Systems Interconnection — Local Area Networks — Provision of the OSI Connection-mode Transport Service and the OSI Connectionless-mode Network Service in an End System on a Token Ring LAN in a single or multiple configuration.