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STRAT-3 (Stratum-3 Clock)
Issue 1 June 2005 2131
The output of the CI and PAI cards go directly to the TN780 Tone-Clock circuit pack via two
25-pair amphenol terminated cables. Every card has red and/or green LEDs for providing status
or alarm indications. The abbreviations used in the table are defined above except for SRC
(source) and PLL (Phase Locked Loop).
Table 763: Stratum-3 Clock LED Indications
Card Name Color Indication
PAI REF A Red Loss of input reference A or CI A failed
REF B Red Loss of input reference B or CI A failed
ST A Red Failed Stratum-3 clock A
ST B Red Failed Stratum-3 clock B
PWR A Green -48VDC A present
PWR B Green -48VDC B present
CI FAIL Red Card failure
DS1 Green DS1 source present
CC Green Composite clock source
1
present
1. Composite Clock (CC) source refers to the protocol used to electrically transfer timing
from the Stratum-3 clock to the switch. The Composite Clock source is not relevant to the
system.
SRC
ACTIVE
Green Card is currently on-line
ST3 FAIL Red Card failure
LOCK Red PLL lost sync with reference or holdover
mode
REF A Red Timing Reference from CI A
REF B Red Timing Reference from CI B
TOC FAIL Red Card failure
PORT ALM Red Output port alarm (one or more)
ST Green Reference present from ST clock
INPUT Green Reference present from CI
500’ Green 500-foot phase advance
1000’ Green 1000-foot phase advance