Maintenance-Object Repair Procedures
555-233-143
8-1526 Issue 1 May 2002
LEDs on Tone-Clock Circuit Packs
The specific flashing pattern of a TN768, TN780, or TN2182 Tone-Clock circuit
pack’s amber and green LEDs indicates the circuit pack’s status. For example,
these flashing LED patterns are used to indicate whether the Tone-Clock circuit
pack is:
■ Deriving timing from an external source
■ Providing the timing signal for its PN
The amber and green LED patterns for TN768, TN780, and TN2182 Tone-Clock
circuit packs are as follows:
Table 8-592. Tone-Clock Amber/Green LED Flashing Codes
Circuit Pack Condition
Tone-Clock
State Explanation
1
flashing amber
2.7 seconds on
0.3 seconds off
1. The external synchronization reference being used is a primary reference, a secondary reference, or an external
Stratum-3 clock when the Tone-Clock is in the master PN. The external synchronization reference used in a
slave PN is an Expansion Interface circuit pack.
active An external timing source is being used as a
synchronization reference.
flashing amber
0.3 seconds on
2.7 seconds off
active The circuit pack is being used as a
synchronization reference.
steady amber
on
active The circuit pack has been reset, but has not
been told which synchronization reference
source to use.
steady amber
off
standby The circuit pack is in standby mode (neither
generating tones nor supplying clocks).
“jingle bells” green and amber
0.1 seconds on, 0.2 seconds off,
0.1 seconds on, 0.4 seconds off,
0.4 seconds on, 0.4 seconds off
standby The system is running maintenance tests on the
standby Tone-Clock circuit pack. (The standby
circuit pack is providing tones.)
other green and amber active The system is running maintenance tests on the
active Tone-Clock circuit pack.
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