ACC HDLC-NRM (SDLC) User's Guide

14 Chapter1
Overview
Product Features
Product Features
NOTE This protocol is not available on the ACC 4-port E1/T1 cards .
The HDLC-NRM (SDLC) protocols are polled protocols, supporting both a
primary and secondary station. Multiple stations may be defined on a line.
However, stations on a line must be either all primary or all secondary.
The HDLC protocols are fully defined in three standards documents
published by the International Standards Organization (ISO). These
standards are ISO 3309, 7809 and 4335, full references to which are given at
the end of this chapter.
The HDLC Normal Response Mode protocols product implements both the
primary and secondary station procedures for the Unbalanced operation
Normal response mode class, as defined in ISO 7809.
The frame types supported are those for the basic repertoire, as defined in
ISO 7809 clause 3.2.2.1. These frames are as follows:
Three optional extended features are provided in addition to the defined
standard features. These features are:
• Remote Power Control
• Broadcast Fa cility
• SDLC Loop Mode Primary
The first two features are more fully described i n Chapter 4 , “Protocol
Specific Configuration,” while the third feature is covered in Appendix
B , “SDLC Loop Mode Option,”.
Commands Responses
II
RR RR
RNR RNR
SNRM UA
DISC DM
FRMR