ISO 8473 1st Edition, December 15, 1989
INFORMATION PROCESSING SYSTEMS - DATA COMMUNICATIONS - PROTOCOL FOR PROVIDING THE CONNECTIONLESS-MODE NETWORK SERVICE *** W/D S/S BY ISO/IEC 8473-1 - ISO/IEC 8473-5 ***
Includes all amendments and changes through Technical Corrigendum 1, December 15, 1992
Additional Comments: ENGLISH
Published By:International Organization for Standardization (ISO)
Scope and field of application
This International Standard specifies a protocol which is used to provide the connectionless-mode Network- Service as described in IS0 8348/Add.l. The protocol relies upon the provision of an underlying connectionless- mode service by real subnetworks and/or data links. The underlying connectionless-mode service assumed by the protocol may be obtained either directly, from a connectionless- mode real subnetwork, or indirectly, through the operation of an appropriate Snbnetwork Dependent Convergence function (SNDCF) or protocol (SNDCP) over a connection-mode real subnetwork, as described in I S 0 8648. This International Standard specifies the way in which this underlying connectionless-mode subnetwork service is obtained from real subnetworks that conform to ISO8802-2 or ISO8208. The iinderlying connectionless-mode subnetwork service may be obtained from real subnetworks that do not conform to either I S 0 8802-2 or IS0 8208, biit the way in which this is done is not specified by this International Standard.
NOTE - The SNDCF defined for the operation o f this protocol iii coiifigiiratioiis that include il subnetwork using the X.25 PLP can be generalized in a straightforward way to cover the operation of IS0 8473 in configurations that include subnetworks that lise connection-oriented protocols other than the X.25 PLP.
This International Standard specifies
a) procedures for the connectionless transmission of data and control information from one Network entity to a peer Network entity;
b) the encoding of the protocol data nnits (PDUs) used for the transmission of data and control information, comprising a variable-length protocol header format;
c) procedures for the correct interpretation of prot.oco1 control information; and
d) the functional requirements for implementations claiming conformance to this International Standard.
The procedures are defined in terms of
a) the interactions among peer Network entities through the exchange of protocol data units;
b) the interactions between a Network entity and a Network Service user through the exchange of Network Service primitives; and
c) the interactions between a network-entity and an underlying service provider through the exchange of service primitives