Avaya S8700 Maintenance Manual page 246

LED Interpretation
Switch Node Interface LEDs
The Switch Node Interface (SNI) TN573 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 6-4
Table 6-4. Switch Node Interface Yellow Led Flashing States
LED on
0.1 sec
0.5 sec
solid on
Tone-Clock Circuit Pack LEDs
The Tone-Clock circuit packs found in non-IPSI-connected port networks have the
standard red, green and yellow LEDs. The red LED has the traditional meaning.
The yellow and green LEDs flash in specific patterns to indicate the status of the
circuit pack. The standby status applies only to systems with a duplication option.
6-14 Issue 1 May 2002
illustrates the SNI yellow LED states.
LED off Condition
0.1 sec Fiber Out-of-Frame. This state indicates a failure of test #238,
which may be caused by absence of the opposite end EI or
Switch Node Interface, a broken or missing fiber, or a missing
lightwave transceiver on either endpoint.
0.5 sec In Frame — No Neighbor. This state corresponds to a failure
of test # 237, usually due to a failure of this SNI, or the EI or
SNI at the opposite of the fiber. This condition may also be due
to a faulty Switch Node Clock (SNC).
SNI Active. This is the normal state for an active SNI.
solid off SNI Standby. This is the normal state for a standby SNI in
systems with a duplication option.
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