AT&T MERLIN LEGEND Release 2.0 Equipment And Operations Manual page 115

Hardware Components
Ability to make outgoing data calls manually and select user-
programmable telephone numbers from the data module display on the
front panel
RS-366 interface to an ACU
Synchronous Features with High-Speed Synchronous Enhancement
Board
V.35 interface (the adapter cable is provided when the board is ordered
by using PEC 21624)
Full-duplex operation at 48, 56, and 64 kbps
Half-duplex operation at 56 kbps only
Automatic answering of incoming data calls
Ability to make data calls manually and select user-programmable
telephone numbers from the data module display on the front panel
Modems
A modem is used at an analog data station to make and answer data calls. It
converts the digital signals of the data terminal into analog signals for
transmission over standard telephone lines. It also converts incoming analog
signals to digital signals for acceptance by the data terminal.
Most types of modems can be connected to the system unless the modem is
being used in a modem pool. The recommended models are as follows:
Modem Model 4000
Modem Model 2224G
Modem Model 4024
Modem Model 2296A
Modem Model 2296
If a modem is used with an MLX telephone, an MFM must be installed in the
telephone to provide a tip/ring interface for the modem. The modem is
connected directly to the MFM. If the modem is used with an analog multiline
telephone, a GPA is required to provide a tip/ring interface for the modem.
When a modem is connected to an MLX telephone using an MFM, data calls are
dialed using the data terminal keyboard and voice calls are dialed using the
telephone dialpad. The MLX telephone cannot be used to dial data calls, and
the data terminal keyboard cannot be used to dial voice calls. Each device
operates independently, and features are assigned to each device
independently,
Adapters and Adjuncts 2-41