Hsl Applications; Video Teleconferencing; Lan Interconnect; Cluster Controller/Frontend Processor Connection - Avaya 6424D+M User Manual

Chapter 1: Introduction
Page 1-6
HSL
APPLICATIONS
Group 4 Fax

Video Teleconferencing

LAN Interconnect

Cluster Controller/Front-
End Processor Connection
The HSL provides access to various switched and dedicated
(private) data networks. The following sections provide a brief
overview of the four major applications. Refer to Appendix D,
''Applications and Switch Administration,'' for information
regarding the configuration and implementation of these
applications.
Group 4 Fax applications include electronic mail and messaging
and electronic storage of printed documents and graphics. Group
4 Fax is a digital facsimile transmission that typically occurs at 56
or 64 Kbps. A Group 4 Fax typically has a keypad for dialing, and
uses an RS-366 Automatic Calling Unit interface to pass the
dialing information to the switch.
Video teleconferencing allows image and sound to be transmitted
over relatively low speed facilities. It provides instant meeting
services to a nearby city or to a foreign country. A typical
conference call involves two 56 or 64 Kbps connections between
locations to carry video and audio traffic. Video teleconferencing
units use a keypad and an associated RS-366 interface for dialing.
High speed dedicated circuits are often used to interconnect Local
Area Networks (LAN) in Wide Area Network configurations. To
accommodate transient changes in LAN traffic, the HSL can
connect to bridges/routers that provide flexible connectivity and
on-demand bandwidth for interconnecting LANs. Dial-up LAN
bridges use an
RS-232 interface for dialing calls. Hayes AT commands provide
the call control.
Dedicated connections between a Cluster Controller and a Front-
End Processor typically use ACCUNET Spectrum of Digital
Services or Dedicated Digital Services to provide data
connectivity. The HSL can function as a Data Service Unit behind
the switch. It supports communications with other Data Service
Units as well as the private network maintenance loopbacks.
DEFINITY Communications System
DEFINITY High Speed Link
User´s Guide