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Slave Site:
1. Set Configuration/Interface/Loop Timing to ON.
2. Set Configuration/Interface/TX Clock Source to SCT (LOOP)
3. Set Configuration/Interface/Buffer Clock to RX Satellite (Buffer Bypass).
A.1.7 G.703
Note: If required, refer to Section A.3 for installation of the interface PCB.
G.703 data is either in AMI, B8ZS (8 zero) suppression, or HDB3 (3 zero) suppression
formats. There is not a coexisting clock that is on a separate line for G.703 data. The
clock is derived from the data stream within the modem and in the user equipment.
Loop timing, if desired, must occur in the customer equipment for the link to operate in
Master/Slave. The modem cannot do loop timing in G.703 operation because the modem
does not emit an ST signal for the Transmit Clock Source.
The modem can be placed in loop timing under EIA-422 or V.35 operation. Therefore, a
master/slave relationship easily occurs. This causes the receive clock to be placed on the ST
line to the terrestrial equipment. The customer equipment can then clock the transmit data to
the modem using the ST line that has been derived from the RX recovered clock.
A–58
or
TX Terrestrial, Only if the user equipment can provide the proper slaved clock to
the modem.
SDM-300A Satellite Modem
Rev. 4
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