Figure 5-7. baseband loopback block diagram – Comtech EF Data SDM-9000 User Manual
Page 154
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Theory of Operation
SDM-9000 Satellite Modem
5–26
Rev. 4
5.5.3.3 Loopbacks
5.5.3.3.1 Baseband Loopback
Baseband loopback provides loopback at the terrestrial interface. The near end
equipment loops back through the baseband loopback relays. The far end equipment
loops through the demodulator, interface, and modulator. Refer to Figure 5-7 for a block
diagram.
BASEBAND
TX DATA/CLOCK
TERRESTRIAL
RX DATA/CLOCK
TX DATA
RX DATA
MODULATOR
DATA
DEMODULATOR
DATA
MODULATOR
MODULE
DEMODULATOR
MODULE
INTERFACE
MODULE
TX IF OUT
RX IF IN
DATA/CLOCK
LOOPBACK
RELAYS
Figure 5-7. Baseband Loopback Block Diagram
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