Lucent Technologies Release 6 manual Test Stratum 3 Clock, Check for Red LEDs

DEFINITY Enterprise Communications Server Release 6	Issue 5
Installation and Test for Multi-Carrier Cabinets 555-230-112	May 1998

6Test Telephones and Other Equipment

Test Stratum 3 Clock Page 6-7

Test Stratum 3 Clock

This sections tests the ability of the Stratum 3 clock to correctly provide timing and alarms to the system.

! CAUTION:

The following procedures are destructive to DS1 data and should not be attempted while there are DS1 facilities in active use.

Check for Red LEDs

1.Turn on the Stratum 3 clock and wait 40-50 seconds to allow the system to complete the on-board diagnostics before checking LEDs.

2.If there are any red LEDs, follow the procedures in Table 6-1.

Table 6-1. Stratum 3 Clock LED Indicators

Card	LED Label	Procedure
PAI	REF A	Check that the CI circuit pack on the left is inserted properly.
		Check wiring for DS1 in carrier “A” which connects the system to
		the CSU and the External Synchronization Clock at the MDF
		through a Y-cable assembly. If all else fails to clear the LED then
		replace the circuit pack.
PAI	REF B	Check that the CI circuit pack on the right is inserted properly.
		Check wiring for DS1 in carrier B which connects the system to
		the CSU and the External Synchronization Clock at the MDF
		through a Y-cable assembly. If all else fails to clear the LED then
		replace the circuit pack.
PAI	ST A	Replace the ST3 card
PAI	ST B	Replace the ST3 card
CI	FAIL	Check wiring for its associated DS1 reference and replace the
		circuit pack if necessary
ST3	FAIL	Replace the circuit pack
ST3	LOCK	Ignore this LED
ST3	HOLDOVER	Ignore this LED
ST3	FREE RUN	Ignore this LED
TOCA	FAIL	Replace the circuit pack
TOCA	PORT ALM	Replace the circuit pack if necessary