TM 11-6625-3041-12/TO 33A1-8-908-1
1-16. INPUT/OUTPUT (cont)
A TIMING switch allows the action of the SG-1139 to be initi-
Timing
ated from one of three sources depending on the setting.
In MASTER, the action is initiated by the internal Master
Oscillater whose output rate is set by the DATA RATE switch.
In LOOPED, the action is initiated by the looped clock, which
is a signal derived from the signals applied to the receiver
input, via the Clock Recover circuit.
In STA CLK, the action is initiated by an external signal
(station clock), which is a part of the transmission equip
ment and is applied to the SG-1139 STA CLK input.