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11-4 DCP Mode 2 Installation and Administration
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Use the following steps to install the modems and data sets.
1. Before installing a 2296A modem, check the feature package module located in the right-hand slot
(modem standing on end). This should be a 140C1 (V1.1 or V1.2 no longer purchasable), 140F
(V1.1), or 140F2 (V1.0) Memory Module.
CAUTION
Do not pull the feature package or other module from the 2296A when power is
applied. Turn the power switch at the back of the 2296A OFF and unplug the 2296A
power cord from the mounting.
The Automatic Calling Unit (ACU) and AUTOCALL modules are not required and should be
removed if present. The Microcom Networking Protocol (MNP) module is only required if the data
rate is 19.2 Kbps. In most AUDIX modem-pooling setups, the data rate is 9600 bps.
2. Install the 2296A modems in 105A slots. Start at the left. The modems must contact their backplane
connector. Set the following options located at the top of the 2296A faceplate under the sliding
panel:
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Switch Option Position
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S1 1 O(pen)
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1 C(losed)
2 C(losed)
3 O(pen)
S2 4 C(losed)
5 C(losed)
6 O(pen)
7 O(pen)
8 C(losed)
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The LCD display will be used to set internal options once power is applied.
3. Before installing the MTDMs, verify that they contain the new processor and TRIC 4 chips (see
Figure 11-3, MTDM Location of TRIC 4 Chips). If not, they must be upgraded before they can be
used. See Chapter 5, DCP Mode 2 Networks — Modem Pooling, for upgrades.
4. Set the following options on the MTDM circuit card:
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Switch 1 2 3 4 5 6 7 8
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Position on off on off on on on off
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5. Install the MTDM data sets in 46A2 slots. Start at the left. Each MTDM is paired with a modem.
The MTDMs must make contact with the backplane connector.