ACC HDLC-NRM (SDLC) User's Guide

Chapter 1 15

Overview

Supported Devices

The HDLC-NRM (SDLC) p rotocol implementation supports either

primary o r secondary stations conforming to the above published

standards. Both point-to-point and multipoint configurations are

supported.

Modes of Operation

The HDLC-NRM (SDLC) implementation supports two normal response

modes of transmission:

• Two Way Simultaneous (TWS) transmission

• Two Way Alternate (TWA) t ransmission

Within TWA mode, both half duplex and full duplex options are

supported.

There is also a restricted implementation of SDLC Loop Mode operation

(see Appendix B). This mode is not available on the 2-Channel ACC

Multiplexer interface.

Data Rates

This release of the HDLC-NRM (SDLC) protocol product is qualified for

use at line speeds from 4800 b its per second to 19,200 bits per second on

the 8-Channel EISA and HP-PB ACC Multiplexer interfaces. When the

HDLC-NRM (SDLC) protocol is used on an 8-Channel EISA or HP-PB

interface in a mode where there is only a single primary or secondary

broadcast terminal configured on a line, the o perat ion of the protocol is

supported at speeds up to 64,000 b its per second.

On the 2-Channel interface, operation of the protocol is supported at

speeds up to 128,000 bits per second.