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Comtech EF Data C5 User Manual

Page 274

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Options

C5/K1/K3 Integrated Satellite Terminal System

A–30

Rev. 0

Master Site Option No. 2:

1. Set Configuration/Modulator/Modem Reference to INTERNAL.

2. Set Configuration/Interface/EXT-CLK Frequency to 10 MHz to INTERNAL.

3. Set Configuration/Interface/TX Clock Source and Buffer Clock to EXT Clock.


Note: Input the 10 MHz clock at either the EXC (CP5) clock, unbalanced input of the
SMS-7000 data switch module, or balanced pins 7 and 8 of the switch module, V3.
This external clock input will go into the modem on pins 35 and 19 of the 50-pin
connector, located at the rear of the modem.

Slave Site:

1. Set Configuration/Interface/Loop Timing to ON.

2. Set Configuration/Interface/TX Clock Source to SCT (LOOP)

or

TX Terrestrial, Only if the user equipment can provide the proper slaved clock to
the modem.


Note: SCT Internal changes to loop when Loop Timing is set to ON.

3. Set Configuration/Interface/Buffer Clock to RX (“Satellite) “Buffer Bypass.”

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