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:

The first two features are more fully described in Chapter 4 “Protocol Specific Configuration” while the third feature is covered in Appendix B “SDLC Loop Mode Option”.