ONORM ENV 41801-9-1993 信息系统互联．无连接式网络服务用继电器．RC51．1121文件（数字数据电路/CSDN租用线路范围内的M－IT－02 Ft/22)

标准号：ONORM ENV 41801-9-1993
中文标准名称：信息系统互联．无连接式网络服务用继电器．RC51．1121文件（数字数据电路/CSDN租用线路范围内的M－IT－02 Ft/22)
英文标准名称：Information systems interconnection - Relaying the connectionless-mode network service - Profile RA51.1121 (M-IT-02 Ft/22 over digital data circuit/CSDN leased line)
发布日期：1993/1/1 12:00:00
实施日期：1999/12/31 12:00:00
适用范围：1.1 GeneralThis Functional Standard is applicable to interworking units concerned with operating in the Open Systems Interconnection (OSI) environment. It specifies a combination of OSI base standards that collectively provide a Network-relay function for the Connectionless-mode Network Service.This part of this Functional Standard is defines the R/A51.1121 profile, which is applicable to interworking units operating between CSMA/CD LAN subnetworks and PSDNs using Virtual Calls over a digital data circuit/CSDN leased line permanent access.1.2 Position within the TaxonomyThe taxonomy of profiles is defined in ISO TR 10000-2. This part of this Functional Standard defines the profileR/A51.1121 Relaying the Connectionless-mode Network Service betweenCSMA/CD LAN subnetworks and PSDNs using virtual calls over a digital data circuit/CSDN leased line permanent access.1.3 ScenarioFigure 1 illustrates the configuration of systems to which the R/A51.1121 profile is applicable. The figure shows two reference points, but an implementation of this profile may include more attachments to CSMA/CD LANs and PSDNs, with a reference point at each.