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8400B Plus Data Module
If self-test failed, the red light will FLASH* three times, and then remain ON.
Other light indications are:
Idle in Normal Mode — The green light is OFF; the red light is ON — This is the unit’s
normal mode if no active data call exists.
Incoming Call — The green light FLASHES; the red light is ON — This indicates an
incoming call.
Active Data Call — Both the green and red lights are ON — This indicates an active
data call.
Test Modes (Other Than Self-Test — Both green and red lights FLASH — This indica-
tion shows that the data module is in test mode.
Memory Error Mode — The green light is OFF; the red light FLASHES — This indicates
that the unit is defective. Call the AT&T Technical Service Center at 1 800 242-2121.
Switch Link Down — The green light WINKS** ; the red light emits an INVERTED
WINK*** — This indication shows that the unit is unable to communicate with the PBX.
Restore the connection between the 8400B Plus and the PBX wall jack.
Phone Link Down — The green light emits an INVERTED WINK; the red light WINKS —
This indicates that the unit is unable to communicate with the telephone. Restore the
connection between the 8400B Plus and the telephone.
Jacks
The 8400B Plus data module is equipped with the following jacks:
PHONE — This connector accepts one end of the D8W telephone line cord used to
connect a 2-wire voice terminal to the 8400B Plus data module.
LINE/POWER — This connector accepts one end of the D8W telephone cord that
connects the 8400B Plus data module and either:
a PBX wall jack already powered by a closet supply, or
a power supply, which is connected to the PBX wall jack.
EIA CONNECTOR INTERFACE — This connector provides an interface between the
8400B Plus data module and the terminal (DTE) device.
If the communications port on the terminal device is a 9-pin interface, use a cord
with DB9 male connectors on each end to connect the data module to the
terminal device.
* A
Flash
is a repeated pattern of 500 ms ON and 500 ms OFF.
** A
Wink
is a repeating pattern of 750 ms ON and 250 ms OFF.
*** An
Inverted Wink
is a repeating pattern of 250 ms ON and 750 ms OFF.
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