This Recommendation is one of a set of Recommendations produced to facilitate consideration of interworking between networks. It is related to Recommendation X.300, which defines the general principles for interworking between public networks, and between public networks and other networks for the provision of data transmission services. Recommendation X.300 indicates in particular how collections of physical equipment can be represented as "subnetworks" for consideration of interworking situations. This Recommendation describes those functionalities of subnetworks which relate to the support of the OSI connection-mode network service.This Recommendation does not describe those functionalities of subnetworks which do not relate to the support of the OSI connection-mode network service (e.g., those arrangements in Recommendation X.301 which do not relate to the support of the OSI connection-mode network service).
ITU-T X.305-1988 history
1988ITU-T X.305-1988 FUNCTIONALITIES OF SUBNETWORKS RELATING TO THE SUPPORT OF THE OSI CONNECTION-MODE NETWORK SERVICE