AT&T MERLIN LEGEND Release 2.0 Equipment And Operations Manual page 226

Data Communications Support
The maximum cord length from an MLX telephone to a the 7500B Data
Module is 80 feet (24 meters). This should be considered if there are
plans to use the voice capability of a port by connecting an MLX
telephone located some distance away from the 75006 Data Module.
Digital Data Station Configurations
As Figure 5-1 shows, the 7500B Data Module interface supports the following
digital data stations:
Digital Voice and Digital Data (Station E): Includes a data terminal (with
a keyboard and display) or a computer connected to a 7500B Data
Module via an RS-232 or V.35 interface. The 7500B Data Module
connects to a jack on a 008 MLX, 408 MLX, or 408 GS/LS-MLX (Release
2.0 only) module on the control unit. The MLX port is shared by the
telephone and the 75006 Data Module but, they operate independently
of each other. The terminal keyboard provides the dialing capability for
the data station.
NOTE:
For a digital voice and digital data station, the MLX telephone cannot
contain an MFM. The MFM interferes with communication to the
switch in this data station configuration.
If the MLX telephone is voice-signaled while active on a call, both B-
channels are required to accommodate the signaling. This may
conflict with the data station.
Digital Data-Only (Station F): Includes a data terminal (with a keyboard
and display) or a computer connected to a 7500B Data Module via an
RS-232 or V.35 interface. The configuration does not include an MLX
telephone, so a 440A4 terminating resistor is required. The 7500B Data
Module connects to a 008 MLX, 408 MLX, or 408 GS/LS-MLX (Release
2.0 only) module in the control unit. The keyboard provides the data call
dialing capability.
NOTE:
There is no analog voice and digital data station configuration.
Data Station Configurations Summary
Table 5-1 summaries the hardware requirements and port assignments needed
to support the various data station configurations.
5-8 Data Communications Configuration Overview