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September 1999 P/N 880-503284-001-A1 - page 55 / 65

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STAT LED

NET LED

Solid Green

The NCC has been loaded with the Test Set 2000 test program using AM2000.

Solid Yellow

A test is in progress and no errors are detected (a test signal is currently being transmitted to the circuit by the CSU and the received pattern matches the transmitted pattern).

Solid Red

Some alarm condition has occurred within the last fifteen minutes on either the Network or Equipment interface.

Flashing Red to Off

Power-up self-test has failed. Verify that the rear CIM module is of a correct type (CIM 2020 or CIM 2025).

Flashing Red to Yellow

Errors have been received during a test (a test signal is being transmitted and the pattern received does not match the pattern sent).

Not Lit

No alarms have occurred within the last fifteen minutes. This is the normal state for the Stat LED.

Diagnostics

The STAT ( follows:

CSU status) LED is a tri-color indicator with six states, as

Meaning

Table 5-4 State

Stat LED States

The NET (network) LED is a tri-color indicator with six states, as

follows:

Table 5-5 State

Net LED States

Meaning

Solid Green A normal signal is being received from the network (all OK).

Solid Yellow

The NCC is looped toward the network via a line loopback (LLB) or payload loopback (PLB) and no errors are being received from

the network.

Solid Red

Continuous errors are being received on the network interface (e.g., LOS, LOF, RAI, AIS).

Flashing Red to Green

Bipolar violations or CRC-6 errors are being received on the network interface.

Flashing Red to Yellow

The CSU is looped toward the network and errors are being received (BPV or CRC-6).

Not Lit

The NCC has no power or, if other LEDS are lit, the NCC is defective.

Verilink NCC 2020 User Manual

5-7

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