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Stratum 3 clock
555-233-116
164 Issue 4 October 2002
2. Set the options on the Stratum 3 (ST3) clock board (see Table 17).
NOTE:
Only SW 1 and SW2 are used. SW1 controls the output of alarm signals
from the Stratum 3 clock board.
3. Set the options on the composite clock timing output board (TOCA) per
Table 18.
4. Set the Stratum 2/Stratum 3 switch to the STRATUM 3 position.
NOTE:
Set switches 1 and 2 according to the distance from the Stratum 3 clock to
the DEFINITY system. Set switch 3 to ON. Set switch 4 to OFF.
Table 17. ST3 clock board option switch settings
Switch Status/Results
SW1
Minor alarm
control
OFF = minor alarm never output
ON = minor alarm is output if holdover occurs
SW2
Major Alarm
Control
OFF = major alarm is output and fail lamp lights if 5 VDC
power is lost and 4 kHz output is lost
ON = major alarm is output and fail lamp lights if 5 VDC
power is lost and 4 kHz output is lost and holdover occurs
Table 18. Composite clock timing output board (TOCA)
Switch Range in feet (meters)
500 1000 1.0
(0.3)
500
(152)
1000
(305)
1500
(457)
2000
(710)
2500
(772)
3000
(914)
OFF OFF
ON OFF
OFF ON
ON ON