AT&T Merlin II Feature Module 2 Data Communications Manual page 48

The following table lists the option settings for the MPDM faceplate.
Option
Data Rate
Select one speed, from 300 to 19200 bps, for data calls.
If the caller will use a modem pool, you must select the
300 to 19200 bps
same speed the modem uses.
TRBK If ON, TRBK allows for three or more "breaks" to
disconnect a data call. If you choose this option, you
must also select ASYN, with the DISC and KYBD
options set to ON.
FDX
OFF
ASYN
OFF
TRBK and DISC options to function.
Can be set to either ON or
Ext
DISC If ON, DISC allows two seconds of a continuous
spacing signal (long break) to disconnect a keyboard-
dialed call. The KYBD option must also be ON.
For data devices connected to the MPDM:
KYBD
KYBD must be OFF if data devices are not to receive
call progress messages.
KYBD must be ON if data devices are to originate calls,
receive call progress messages, or disconnect calls
using the TRBK or DISC options.
OFF-PRTY These option switches work together to determine the
parity for call progress messages:
O/EV-l/OD
PRTY
ON
ON
OFF
OFF
The KYBD option must also be ON.
Must be OFF.
DMLL
Must be OFF.
MKBY
Must be OFF.
SIGLS
Must be ON, to enable the MPDM's automatic answer
AANs
feature.
Comment
selects full-duplex operation.
selects asynchronous operation and allows the
OFF.
Parity set to
E/O
1/OD Odd
Even
O/EV
l/OD One
Zero
O/EV
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