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Circuit pack LEDs
Issue 1 June 2005 259
3. Reseat the suspect circuit pack.
!
CAUTION:
CAUTION: This procedure can cause a partial or total service outage. Consult thoroughly the
documentation for the associated maintenance object before proceeding.
Observe the precautions and procedures described above.
4. Inspect the backplane connectors for bent pins.
5. If the system seems to be functioning correctly, but the circuit pack in question will not
communicate with the system, replace the circuit pack.
Expansion Interface circuit pack LEDs
The Expansion Interface (EI) TN570 circuit pack has the standard red, green and yellow LEDs.
The red and green LEDs have the traditional meaning, where red indicates an alarm condition,
and green indicates testing in progress.
The yellow LED displays various flashing patterns to provide status information useful in
isolating faults in the fiber link and other components connected to the fiber link.
Table 64: Expansion Interface yellow LED flashing codes
on page 259 illustrates the EI yellow
LED states.
Table 64: Expansion Interface yellow LED flashing codes
LED
on
LED
off
Condition
0.1 sec 0.1 sec Fiber Out-of-Frame. This state indicates a failure of test #989. This may
be caused by absence of the opposite end EI or Switch Node Interface
(SNI), a broken or missing fiber, or a missing lightwave transceiver on
either endpoint.
0.5 sec 0.5 sec In Frame — No Neighbor. This state corresponds to a failure of test #
237, usually due to a failure of this EI or of the EI or SNI at the other end
of the fiber.
2 sec 0.2 sec EI Active. This is the normal state of an active EI that is an archangel of
an EPN.
solid on EI Active. This is the normal state for an active EI that is not an EPN
archangel. These include EPN EIs connected to other EPN EIs in direct
connect configurations, and EIs located in the processor port network.
solid off EI Standby. This is the normal state for a standby EI in systems with a
duplication option.