SIS SS-ENV 41 109-1988 信息系统互连．局域网．在令牌环单．网络中的终端系统上使用连接模式的网络服务提供了OSI连接模式传输服务

标准号：SIS SS-ENV 41 109-1988
中文标准名称：信息系统互连．局域网．在令牌环单．网络中的终端系统上使用连接模式的网络服务提供了OSI连接模式传输服务
英文标准名称：Information Systems Interconnection — Local Area Networks — Provision of the OSI Connection-mode Transport Service using Connectionless-mode Network Service in an End System on a Token Ring single LAN.
发布日期：1988/6/25 12:00:00
实施日期：1999/12/31 12:00:00
适用范围：This Functional Standard defines the provision of the OSI connection-mode transport service between two end systems connected to a Token Ring LAN. The use of this profile is restricted to a single LAN.A system that supports only the protocol set for layers 1 to 4 specified in this Functional Standard does not satisfy the conformity requirements for the transport layer defined in ISO/DIS 8073, nor does it satisfy the conformity requirements for the network layer defined in ISO/DIS 8473.This Functional Standard specifies a set of protocols, termed a profile, to provide the function defined above. It does not specify total system capability. In particular a system may operate this profile 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 solely those necessary for operation of the protocol set specified.Note: Both Functional Standards ENV 41 109 and ENV 41 110 can be appliedto single LAN environments. Preference should be given to ENV 41 110 in suchcases where extensibility of a configuration is to be envisaged.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 10.1 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 IS0/IEC JTC 1 standardization work mentioned above.