Filter
Top Products
3. Operation
3-6
February 2001 3160-A2-GB21-90
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.
FAST BLINK:
The carrier-mounted DSU/CSU is currently
selected by the SDCP.
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.