Instruction manual

HARDWARE AND SOFTWARE DETERMINATION
Modular Trunk Data Module (MTDM)
The MTDM provides an EIA-232C DTE interface for connection to off-premises (out-of-building)
private-line trunk facilities or a switched telecommunications network, and a DCP interface for
connection to the switch. The MTDM may also serve as part of a conversion resource for
modem pooling. The MTDM is also used to interface with DCE-type multiplexers.
Modular Processor Data Module (MPDM)
The MPDM provides a DCE asynchronous or synchronous interface for connection to data termi-
nals, CDR output devices, Manager I or G3r-MT terminals, on-premises (in-building) administra-
tion terminals, and host computers.
The MPDM can be preset in the factory to provide the following interfaces: EIA-232C, RS-449,
V.35, and RS-366 to support ACU (Automatic Calling Unit)-type dialing.
The MPDM can be configured to support the Data Call Setup or Off-Premises Data-Only Exten-
sion feature. The MPDM also supports data rates of 56 and 64 kbps for downloading and other
high-speed data transfer requirements.
7400A Data Module
The 7400A Data Module may be used instead of an MTDM when supporting the combined
Modem Pooling feature. The 7400A Data Module supports asynchronous operation and provides
a DCP interface to the switch and an EIA-232C interface to the associated modem.
7400B Data Module
The 7400B Data Module supports asynchronous data communications and can operate in the
stand-alone mode for data-only service or in the linked mode, which provides simultaneous voice
and data service (acts like a DTDM). The 7400B provides voice and data communications to
7400D-series voice terminals and the 602A1 CallMaster voice terminal that have a connection to
a data terminal or personal computer. The 7400B integrates data and voice into the DCP proto-
col required to interface to the switch via a port on a Digital Line circuit pack. The 7400B may be
used instead of an MPDM when asynchronous operation at speeds of 19.2 kbps or less is
required to provide a DCP interface to the switch for data terminals, printers, etc. The 7400B
does not support synchronous operation and keyboard dialing.
7500B Data Module
The 7500B Data Module supports synchronous or asynchronous communications and can
operate in the stand-alone mode for data-only service or in linked mode, which provides simul-
taneous voice and data service. The 7500B provides voice and data service to 7500-series voice
terminals and the 8503T voice terminal. The 7500B integrates data and voice into the ISDN pro-
tocol required to interface to the switch via a port on the BRI circuit pack. The 7500B may be
used instead of an Asnynchronous Data Module (ADM) when synchronous operations at speeds
of up to 64 kbps are required.
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