System Capacities; Ds1 Capabilities - AT&T MERLIN LEGEND System Reference Manual

System Overview

System Capacities

DS1 Capabilities

The communications system can be arranged as a stand-alone system or as
part of a private network and comes in two sizes, large and small. The large
system supports up to 224 jacks to connect 80 central office lines/trunks and
144 stations (such as telephones and fax machines), and the small system
supports up to 80 jacks to connect 24 lines/trunks and 56 stations. The capacity
of the system is determined by the size of the memory in the processor module
(including the feature module) located in the control unit.
The large version of the system supports
up to 108 simultaneous two-party conversations (40 in the small version)
up to 80 line/trunk jacks (24 in the small version), including basic, DID, tie,
FX, WATS, and 800 service
up to 255 station endpoints (56 in the small version) that support a
combination of
up to 144 physical station jacks (56 in the small version) for telephones
and adjuncts
up to 127 logical digital data ports (via ISDN 7500B Data Modules
connected to jacks on the MLX module) providing RS-232 connections to
data terminals and personal or multiport computers
See "Capacities" in Chapter 6 for a full explanation of the small and large system
capacities.
A Digital Signal 1 (DS1) is a transmission system that carries digital signals in
the DS1 format. The outside DS1 facility connects to a channel service unit
(CSU), which in turn connects to the 100D module. The CSU ensures that the
transmission of the 100D module matches the transmission of the outside DS1
facility. The 100D module can be programmed to handle either T1 or ISDN-PRI
service.
See "DS1 Facilities " in Chapter 4 for a full explanation of how the system works in
DS1 format.
Capabilities 1-21