標準號：ONORM ENV 41801-8-1993
中文標準名稱：信息系統(tǒng)互聯(lián)．無連接式網(wǎng)絡服務用繼電器．RC51．1111文件(PSDN租用線路范圍內(nèi)的M－IT－02R/22)
英文標準名稱：Information systems interconnection - Relaying the connectionless-mode network service - Profile RA51.1111 (M-IT-02 R/22 over PSDN leased line)
發(fā)布日期：1993/1/1 12:00:00
實施日期：1999/12/31 12:00:00
適用范圍：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/A51.1111 profile, which is applicable to interworking units operating between CSMA/CD LAN subnetworks and PSDNs using Virtual Calls over a PSTN leased line permanent access.1.2 Position within the TaxonomyThe taxonomy of profiles is defined in M-FT-02. This part of this Functional Standard defines the profileR/A51.1111 Relaying the Connectionless-mode Network Service betweenCSMA/CD LAN subnetworks and PSDNs using virtual calls over a PSTN leased line permanent access.1.3 ScenarioFigure 1 illustrates the configuration of systems to which the R/A51.1111 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.