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5-8 DCP Mode 2 Networks — Modem Pooling
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Modems and Data Modules
The following modems can be used in a modem pool for AUDIX networking. One modem is required for
each modem pool pair.
• AT&T 2296A (rack-mounted or stand-alone modem pool). If used in a stand-alone modem pool, an
auto-dialer module is required.
NOTE
The 2296A must have a 140C1, (V1.1 or V1.2; supported but no longer purchasable) or a
140F1 Memory Module (V1.1) installed in the right-hand slot at the bottom of the 2296A
(modem standing on end). The version can be seen on the front label of the module. It
should be labeled ABTLG or ABTTA. If not, order a new chip by calling 1-800-222-
PART (comcode 105304935).
• MICROCOM QX 3296/C (stand-alone modem pool).
• AT&T Paradyne 3820 (stand-alone modem pool).
• AT&T Paradyne DM424 (stand-alone modem pool).
NOTE
Equivalent modems such as the AT&T Paradyne DL424 instead of the DM424 modem could
be used.
The following data modules can be used in a modem pool used by AUDIX systems. One data module is
required for each modem pool pair.
• 7400A Data Service Unit (rack-mounted or stand-alone modem pool)
NOTE
The 7400A DSU is configured for Data Terminal Equipment (DTE) modem pool
operation with D-lead controlled 2296-type modems. The mounting package includes an
adapter harness (WP90780L0), an OR-6316 bridging adaptor, and a 2296A modem
control cable (D-Lead).
• MTDM (rack-mounted modem pool)
NOTE
Make certain the MTDM is set up in one of two ways: 1) processor PID ABCED and
EPROM PID ABGHB are used, or 2) processor PID ABGHC, no EPROM installed, and IC3
is numbered 8052. In either case, make sure that TRIC 4 chips are used (coded 229EJ). If
the MTDM requires an upgrade, order the MTDM D-kit (comcode 103033211). This should
be D-kit D181470. Old versions of the MTDM (TDM/2 Z700C models) should also get
D181469. See Chapter 11, DCP Mode 2 Installation and Administration, for the location and
identification of these chips.
In selecting modems or data modules for modem pooling, it is important to note that once a specific model
is chosen for use on one end of the remote network, only certain models will work on the other end of the
remote connection. Combinations that have been tested are listed in the following tables. Combinations
that work are marked as ‘‘OK,’’ and those that do not work are marked ‘‘FAIL.’’