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Operation
3-53163-A2-GB20-10 March 1999
Table 3-1
System LEDs
Name
Color Meaning
OK Green Indicates the current operational state of the DSU/CSU.
ON:
The DSU/CSU is operational and has power.
OFF:
The DSU/CSU is performing a power-up self-test or a system failure
has occurred.
BLINKING:
A software download is in progress.
FAIL Yellow Indicates a system failure or a self-test.
ON:
A device error/fault is detected or a reset has just occurred.
OFF:
No system failures are detected.
BLINKING
: A self-test is in progress.
TEST Yellow A system test is in progress.
ON:
A loopback or pattern test has been initiated either locally, by the
network, or externally.
OFF:
No tests are active.
Table 3-2
Network Interface LEDs
Name Color Meaning
SIG Green Monitors the signal being received from the network.
ON:
A recoverable signal is being received from the network.
OFF:
The signal cannot be recovered from the network (a Loss of Signal
condition exists).
OOF Yellow Monitors Out Of Frame (OOF) conditions on the received network signal.
ON
: At least one OOF was detected on the signal during the sampling
period.
OFF:
No OOFs were detected on the signal during the sampling period.
ALRM Yellow Indicates whether an alarm condition exists on the received network signal.
ON:
An alarm condition (LOS, LOF, EER, Yellow, AIS) exists on the
received network signal. Use the Device Health and Status
command to determine the alarm type.
OFF:
No alarm condition exists on the network interface signal.
EER Yellow Indicates the Excessive Error Rate (EER) has been exceeded on the network interface.
NOTE: This LED is only valid when ESF framing is being used.
ON:
The EER has been exceeded on the network interface.
OFF:
The EER has not been exceeded on the network interface.