Modem Unit (Modu) - Vodavi Starplus Triad-S Installation Manual

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The MPB may be equipped with 3 daughter boards: MODU for modem
access to the system, DTMF-4A for DTMF receiver expansion up to five,
and a MISU for two serial ports and a second music source.
Software for the system is contained on two chips labeled U1 and U2 in
the Program Module Unit (PMU) module.
The MPB provides miscellaneous features:
These features are provided through the amphenol connector on the
front edge of the CKIB installed in the first slot of the BKSU. These features
are controlled by system software.

Modem Unit (MODU)

The Modem Unit provides an asynchronous modem for access to the
system database and remote maintenance. The module is optionally
installed on the BKSU's MPB and includes a 9600 baud modem. The
modem may be accessed from any station or CO. The MODU port is
independent of the MISU RS232C ports, enabling system database
access, etc., without interrupting the SMDR output.
Installing the MODU
1. Using a grounding strap, unpack the MODU from its anti-static bag in
2. Locate the CN6 connector (outlined) on the MPB.
3. Locate the CN1 connector on the MODU.
4. Position the MODU so the CN1 matches with CN6 on the MPB.
5. Push the MODU onto its connector, making sure it is properly seated.
6. Match the screw hole on the MODU PCB bracket with the screw hole
One external page port that is connected to transformers, providing a
600 ohm impedance.
One music input that is connected to transformers, providing a
600 ohm impedance.
Two independent dry relay contacts rated at 1 amp, 24V DC.
A DTMF receiver.
the packing box.
on the base frame.
Modem Unit (MODU)