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Stratum 3 clock
2. Set the options on the Stratum 3 (ST3) clock board (see
Table 17. ST3 clock board option switch settings
Switch
SW1
Minor alarm
control
SW2
Major Alarm
Control
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
4. Set the Stratum 2/Stratum 3 switch to the STRATUM 3 position.
Table 18. Composite clock timing output board (TOCA)
Switch
500
1000
OFF
OFF
ON
OFF
OFF
ON
ON
ON
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.
164
Issue 4 October 2002
Status/Results
OFF = minor alarm never output
ON = minor alarm is output if holdover occurs
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
18.
Range in feet (meters)
1.0
500
(0.3)
(152)
1000
1500
2000
(305)
(457)
(710)
Table
17).
2500
3000
(772)
(914)
555-233-116
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