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LEDs
Network Status LEDs
LED
Display
OK
Test
Error
Alarm
If the alarm conditions have been corrected, the alarm which caused the
activation of the Alarm LED can be viewed under the U
menu.
61202156L2
The network status LEDs display the operational condi-
tion of the network interface located on the controller
board in the unit.
Color
Green
The operation is in the normal mode and no
errors have been detected.
Yellow
The network interface is operating in a test
mode. This includes a self-test or a test
loopback. When lighted, this LED also
indicates that normal data flow is not
occurring on the network interface.
Red
An error has occurred, such as a BPV, OOF,
or CRC.
Red
An alarm condition has been detected. Any
alarm condition will activate the alarm relay
for the external alarm device. When the
alarm condition is no longer valid, the OK
LED activates (turns on). To view an alarm
condition, select the active alarm menu item.
TDU 120e User Manual
Chapter 3. Operation
Indicates that...
NIT
H
ISTORY
3-9
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