Base Band Loopback; Figure 5-10. Baseband Loopback - Comtech EF Data SLM-7650 Installation And Operation Manual

SLM-7650 Satellite Modem
Maintenance
5.3.4.2

Base Band Loopback

When baseband loopback is turned on (Configuration-Interface menu), 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 verity the customer equipment and cabling between
the modem and the customer equipment.
NOTE: The data rate of the mod and demod must match for IF Loopback to operate
CUSTOMER
DATA
REMOTE SERIAL
INTERFACE
FAULT INDICATORS
SATELLITE MODEM
properly. Both the modulator and demodulator sections of the modem are
affected by activating this test mode.
IBS OR IDR DATA
ENCODER/
MODULATOR
INTERFACE
MICRO-
COMPUTER
DEMODULATOR/
DECODER

Figure 5-10. Baseband Loopback

POWER SUPPLY
5–20
Revision 4
MN/SLM7650.IOM
TRANSMIT RF
EQUIPMENT
ANTENNA
AC POWER
RECEIVE RF
EQUIPMENT