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DEFINITYEnterpriseCommunicationsServerandSystem75andSystem85
Terminals and Adjuncts Reference
555-015-201
Issue 11
December 1999
Data Modules
21-9The 7400B and 7400B Plus Data Module
21
In the linked mode, the 7400B and 7400B Plus data modules provide for
simultaneous voice data communications over standard twisted pair wiring. In this
mode, the 7400B and 7400B Plus data modules can be used with all DCP voice
terminals to provide data service. The 7400B Plus provides the voice dial feature
for all DCP voice terminals
except
the following:
■ 7403D voice terminal (all models)
■ 7404D voice terminal (all models)
■ 7405D voice terminal (all models)
■ 7407D01A voice terminal
Applications
The 7400B and 7400B Plus data modules can be used with the DEFINITY
Communications System Generic 1, Generic 2, and Generic 3, the DEFINITY
ECS, System 75, and System 85. The data modules are used as a DCE for host
access services, PC, or terminal (DTE) connectivity (see Figure 21-3).
Figure 21-3 shows a diagram of the connections between the 7400B or 7400B
Plus and the data terminal, the digital voice terminal, and the switch.
Figure 21-3. A Block Diagram of the 7400B Interface
Data
Terminal
Data
Service
Digital Switch
RS-232C
Unit
DCP
Digital
Line
Port
7400B or
7400B Plus
Digital
Voice
Terminal