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3-2
3162-A2-GB20-40
August 2000
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-on 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 System
and Test Status screen 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.