TM 11-7025-234-23
Control Board (A4) Plug Jumpers
Normal
Config-
Description
uration
Name
Jumper
With jumper out, AGC is preset to -38 dBm.
A
OUT
AGC Preset
With jumper in, AGC is preset to -24 dBm.
With jumper in, CH fallback is 4800 bps (2400
OUT
Fallback
Rate
B
baud) for a 9600 modem. With jumper out,
fallback is 7200 bps (2400 baud). The RATE
switch affects the fallback rate as shown below:
Control Card
Control Card
Jumper
RATE
Data
Jumper B
--N
I
Switch
Rate
OUT
48/24
72
96
1
48/24
48/24
72
2
3
48/24
48/24
48/24
48/16
4
48/16
24/12
24/12
24/12
24/12
5
c
OUT
With jumper in, the normal CF drop (when the modem
Inhibit A
is in receive train mode) is inhibited. Thus, CF
follows carrier detect. Inhibit A is
automatically in effect when the modem is in the
V.29 mode.
With jumper in, the receive data is clamped to an
OUT
D
Space Hold
EIA Space when CF is OFF. With jumper out, it is
clamped to a Mark.
With jumper in, CA ON forces CF OFF.
OUT
Half-Duplex
E
F
Spare
With jumper in, CC is always ON.
OUT
H
Always CC
With jumper in, carrier is controlled by CA and
OUT
Carrier Control J
training is initiated on every rising edge of CA.
With jumper out, carrier is always ON unless
configured as a multipoint slave.
OUT
With jumper in, DD is disabled when CF is OFF.
CF Gate Jumper K
1-16
