About The Hsl; Features - Avaya 6424D+M User Manual

Chapter 1: Introduction
Page 1-2

ABOUT THE HSL

Features

This section discusses the basic operational features of the HSL,
and describes the external indicators and connectors.
The HSL provides the following features:
Super-twist Liquid Crystal Display (LCD) and three push-
button switches for displaying status, setting options,
controlling tests, storing telephone numbers, originating and
answering calls.
Two LEDs for power, incoming calls, data mode, test mode
and fault indications.
V.35 internally timed, synchronous data interface for 56 Kbps
half duplex operation, 56 Kbps full duplex operation, and 64
Kbps full duplex operation.
RS-366 Automatic Calling Unit (ACU) interface for originating
data calls.
RS-232 AT command interface for originating and
disconnecting data calls.
Test features for easy system fault isolation.
Non-volatile memory for option and telephone number
storage.
Reset options feature for easy loading of default options.
Automatic or manual answer option.
Data inversion option for compatibility with older 64 Kbps
Digital Communications Protocol (DCP) data modules.
A DTR lead IGNORE option and DSR lead ON option for
operation with terminals that normally interface with private
line DCE equipment.
An optional DTR lead activated dial feature for stored number
dialing.
An optional DTR HOTLINE dial feature.
A permanent connection option for operation in private line
applications.
Memory cartridge interface for firmware upgrades to support
new features.
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