Figure 4-7. Interface Loopback; Intrfc Loop Back - Comtech EF Data SNM-1001L Installation And Operation Manual

SNM-1001L Satellite Modem
Front Panel Operation
FUNCTION SELECT: CONFIGURATION: INTERFACE:
INTRFC LOOP BACK (CONDITIONAL)
IMPORTANT
Programs the modem for Interface Loopback operation. When INTERFACE LOOPBACK is
turned on, data is looped back at the modem side of the interface. This is a bi-directional loop
back of the data after the base band data has had the overhead added. Refer to Figure 4-7 for the
interface loopback block diagram.
Upon entry, the current status is displayed. [↑] or [↓] to make the selection. Press [ENTER] to
execute the change.
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 interface loopback is turned on, data is looped back on the modem side of the interface. This test mode will verify the internal
channel unit interface operation.

INTRFC LOOP BACK

This is a Test Mode. Conditional: This menu is only available when the
overhead interface PCB or Reed-Solomon PCB is installed.
DATA
I N T E R F A C E
DEMODULATOR/
S A T E L L I T E M O D E M

Figure 4-7. Interface Loopback

OFF
ENCODER/
MODULATOR
MICRO-
POWER SUPPLY
COMPUTER
DECODER
4–30
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