LED Interpretation
555-233-143
6-14
Issue 1 May 2002
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.
illustrates the SNI yellow LED states.
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.
Table 6-4.
Switch Node Interface Yellow Led Flashing States
LED on
LED off
Condition
0.1 sec
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
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).
solid on
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.
Summary of Contents for S8700 Series
Page 50: ...Maintenance Architecture 555 233 143 1 26 Issue 1 May 2002 ...
Page 74: ...Initialization and Recovery 555 233 143 3 12 Issue 1 May 2002 ...
Page 186: ...Alarms Errors and Troubleshooting 555 233 143 4 112 Issue 1 May 2002 ...
Page 232: ...Additional Maintenance Procedures 555 233 143 5 46 Issue 1 May 2002 ...
Page 635: ...status psa Issue 1 May 2002 7 379 555 233 143 status psa See status tti on page 7 406 ...
Page 722: ...Maintenance Commands 555 233 143 7 466 Issue 1 May 2002 ...