131
Install the Stratum 3 clock
October 2002
Connect Clock Cabinet Grounding
1 Measure and cut a 6 AWG (#40) (16 mm
2
) wire long enough to reach from the clock
cabinet to the ground discharge bar in the DC power plant.
2 Insert 1 end of the wire into the ground lug on the clock cabinet and tighten the screw.
3 Attach the lug to the receptacle cover. Be sure the lug and cabinet ground wires connect
to separate screws on the receptacle cover.
4 Route the ground wire to the DC power plant and connect to DISCH GRD inside the
cabinet.
Connect Stratum 3 Clock DC Power
1 Set the clock cabinet circuit breaker at the DC power plant OFF.
2 At the clock cabinet, connect a 6 AWG (#40) (16 mm
2
) ground wire to the -48V terminal
on the terminal strip.
3 At the clock cabinet, connect a 6 AWG (#40) (16 mm
2
) wire to the -48VRTN terminal on
the terminal strip.
4 Route the wires out of the cabinet and to the DC power plant.
5 At the DC power plant, connect the -48V wire to the DC OUTPUT circuit breaker.
6 At the DC power plant, connect the -48VRTN wire to the DISCH GRD bar.
Set the Clock Options
There are four sets of option switches on the clock.
1 Set the options on the Clock Input (CI) circuit pack according to ‘‘CI Option Switch
Settings’’ on page 131.
2 Set the options on the Stratum 3 Clock (ST3) circuit pack according to ‘‘ST3 Clock
Circuit Pack Option Switch Settings’’ on page 132.
3 Set the options on the Composite Clock Timing Output (TOCA) circuit pack according
to ‘‘Composite Clock Timing Output (TOCA) Circuit Pack’’ on page 132
.
4 Set the Stratum 2/Stratum 3 switch to the STRATUM 3 position.
CI Option Switch Settings
Switch Function Position
1 T1 Select OFF = enable (default)
ON = disable
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