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Chapter 3. Operation
61202156L2 TDU 120e User Manual 3-9
LEDs
Network Status LEDs
The network status LEDs display the operational condi-
tion of the network interface located on the controller
board in the unit.
LED
Display
Color Indicates that...
OK Green The operation is in the normal mode and no
errors have been detected.
Test 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.
Error Red An error has occurred, such as a BPV, OOF,
or CRC.
Alarm 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alarm condition is no longer valid, the OK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.
If the alarm conditions have been corrected, the alarm which caused the
activation of the Alarm LED can be viewed under the
U
NIT
H
ISTORY
menu.