Figure 4-6. Baseband Loopback - Comtech EF Data SNM-1001L Installation And Operation Manual

SNM-1001L Satellite Modem
Front Panel Operation
FUNCTION SELECT: CONFIGURATION: INTERFACE:
B-BAND LOOP BACK
IMPORTANT
Programs the modem for baseband loopback operation. When baseband loopback is turned on,
the data and timing signals are switched from the demodulator to the modulator on the modem
side of the interface. The DTE baseband signals are also looped back from the transmitter data
and clock to receiver data and clock on the customer side of the interface. This is a bi-directional
loopback of the baseband data. Refer to Figure 4-6 for a block diagram of baseband loopback
operation.
C U S T O M E R
D A T A
R E M O T E S E R I A L
I N T E R F A C E
F A U L T I N D I C A T O R S
Note: When baseband loopback is turned on, data is looped back on the customer side of the interface. This is a bi-directional loopback
of the baseband data. This test mode will verify the customer equipment and cabling between the modem and the customer equipment.
B-BAND LOOP BACK
This is a Test Mode.
DATA
I N T E R F A C E
DEMODULATOR/
S A T EL L I T E M O D E M

Figure 4-6. Baseband Loopback

OFF
ENCODER/
MODULATOR
MICRO-
POWER SUPPLY
COMPUTER
DECODER
4–29
Revision 1
MN/SNM1001L.IOM
T R A N S M I T R F
E Q U I P M E N T
ANTENNA
AC P O W E R
R E C E I V E R F
E Q U I P M E N T