User Guide

DEFINITY Enterprise Communications Server Release 5
Maintenance and Test for R5vs/si
555-230-123
Issue 1
April 1997
Maintenance Object Repair Procedures
Page 10-1002PDMODULE, TDMODULE (Data Module)
10
Figure 10-74. Typical Data Module Application
The MPDM provides an interface for Data Terminal Equipment (terminals), and
the MTDM (see Note) provides an interface for Data Communications Equipment
(transmission equipment such as modems).
NOTE:
Early versions of these data modules were referred to as PDMs and TDMs,
respectively. Later models are designed to provide various customer
interfaces through the use of interchangeable interface modules and,
therefore, are called modular data modules. Both versions are supported
by the tests described in this section.
The PBX loop or digital link between a data module and the Digital Line port
supports two logical information channels and one signaling channel. MPDMs
and MTDMs use the primary information channel for data communications and
the signaling channel for dialing and call supervision. The secondary information
channel can be used to support a second data module on a shared digital port.
Data modules are not only used for data calls between terminals, computers, and
data communications equipment, but are also used as interfaces to equipment
associated with system features such as System Administration, CDR, MCS,
ACD, DCS, and AUDIX. Maintenance tests for data modules associated with
LOOP
(DIGITAL LINK
INFORMATION AND
SIGNALING CHANNELS)
MODULAR PROCESSOR
DATA MODULE
DIGITAL
LINE
CIRCUIT
PACK
MPDM
TERMINAL
DIGITAL
LINE
CIRCUIT
PACK
HOST
COMPUTER
DATA MODULE
MODULAR TRUNK
MTDM
TDM
BUS
"DEFINITY" COMMUNICATIONS
SYSTEM