Comtech EF Data C5 - Manual (Page 274)

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.”