AT&T MERLIN LEGEND Release 2.0 Equipment And Operations Manual page 113

Hardware Components
Figure 2-16. 7500B Data Module Back Panel
When the 7500B Data Module is used with an MLX telephone, one end of the
D8W cord is plugged into the PHONE jack on the data module, and the other
end of the cord is plugged into the LINE jack on the MLX telephone. The
maximum cord length from the data module to the telephone cannot exceed 80
feet (24 meters). The MLX telephone cannot be used to dial data calls, and the
data terminal equipment connected to the data module cannot be used to dial
voice calls. Each device operates independently, and features are assigned to
each device independently.
NOTE:
Do not connect two 7500B Data Modules on one line.
The data module can be configured as a stand-alone by ordering a
WP90110,L1 power unit The data module can also be configured in a multiple-
mount arrangement by ordering a Z77A data mounting, which provides a
common power supply for up to eight data modules. Both the power unit and
the data mounting require a 115-VAC power outlet. Neither the power unit nor
the data mounting is provided with the data module; both must be ordered
separately.
The 7500B Data Module does not have the internal 100-ohm line termination
that is provided with MLX telephones. Therefore, when it is used without an
MLX telephone, a 100-ohm 440A4 terminating resistor adapter must be installed
on the line near the data module.
To provide synchronous operation at speeds up to 64 kbps, the following
optional circuit boards must be ordered:
Female 25-pin EIA
Adapters and Adjuncts
2-39