Comtech EF Data C5 - Manual (Page 193)

C5/K1/K3 Integrated Satellite Terminal System Operation
Rev. 0 4–67
CUSTOMER
DATA
REMOTE SERIAL
INTERFACE
FAULT INDICATORS
IN
ASYNC
TERFACE
ENCODER/
MODULATOR
TRANSMIT RF
EQUIPMENT
MICRO-
COMPUTER
POWER
SUPPLY
RECEIVE RF
EQUIPMENT
AC POWER
ANTENNA
DEMODULATOR/
D
RS
ENCODER
ECODER
IDU
RS
DECODER
Figure 4-23. Interface Loopback
Note: When interface loopback is turned on, data is looped back on the modem side of the interface. This is a bi-directional loopback of the data
after the baseband data had the 16/15 overhead added for ASYNC; Add 225/205 for Reed-Solomon
overhead. This test mode will verify the internal channel unit interface operation.