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7400B and 7400B Plus Data Module
DATA
TERMINAL
RS-232C 7400B or
7400B PLUS
DCP
DIGITAL
LINE
PORT
DIGITAL SWITCH
DIGITAL
VOICE
TERMINAL
FIGURE 5-2. Block Diagram of the 7400B Interface
Physical Description
Dimensions
Note: The following measurements for the 7400B and 7400B Plus data module are approx-
imate.
Width = 7 inches
Depth (front and rear) = 8 3/4 inches
Height = 1 3/4 inches
Lights
POWER/TEST light
The red POWER/TEST light goes on when AC power is supplied to the 7400B or 7400B
Plus data module and flashes during all tests. This light, together with the DATA light,
also flashes if there is a DCP line problem.
DATA light
The green DATA light goes on during a data call. This light, together with the
POWER/TEST light, flashes if there is a DCP line problem.
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