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Acculink DSU/CSU Data Service Unit Models 3160-A4, 3161, 3164-A2, and 3165-A4 Operator's Guide

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3. Using the Front Panel
3-6
March 2001 3160-A2-GB24-10
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.
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.