CAN/CSA-ISO/IEC ISP 10613-11-99(R2004)

1Scope1.1General ISO/IEC ISP 10613 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 ISO/IEC ISP 10613 defines the RA51.53 profile, which is applicable to interworking units operating between CSMA/CD LAN subnetworks and Token Ring LAN subnetworks.1.2Position within the Taxonomy The taxonomy of profiles is defined in ISO/IEC TR 10000-2. This part of ISO/IEC ISP 10613 defines the profileRA51.53Relaying the Connectionless-mode Network Service between CSMA/CD LAN subnetworks and Token Ring LAN subnetworks.1.3Scenario Figure 1 illustrates the configuration of systems to which the RA51.53 profile is applicable. The figure shows two reference points, but an implementation of this profile may include more attachments to CSMA/CD and Token Ring LAN subnetworks, with a reference point at each.As this profile is a member of the RA group, it is intended that a conforming implementation is capable of interworking with other profiles of the RA group and with End Systems implementing profiles from the TA or UA groups, provided that suitable relays are in place in the case of those members of these groups which relate to different elements of the subnetwork taxonomy.This part of ISO/IEC ISP 10613 specifies the required functions from the supporting protocol stack shown in figure 2.