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3-73160-A2-GB22-10 December 1996
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 BLINKING:
The 3161 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.