User manual

Chapter 3. Operation
3-10 TDU 120e User Manual 61202156L1-1
Port Status LEDs
Port 1.1 Option Card Monitor Jacks
These are used to connect option cards to the computer.
Port Status LED Display Indicates that...
OK (green)
the operation is in the normal mode and no
errors have been detected.
Test (yellow) one of the interfaces is operating in a test
mode. This includes a self-test or a test loop-
back.
When illuminated, it also indicates that normal
data flow is not occurring in at least one of the
module ports.
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condition is no longer valid, the OK LED acti-
vates (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
IS
-
TORY
menu.