TM 11-7025-234-23
Table 1-4.
Domestic 1/0 Board (A9) Jumpers -- Continued
Normal
Description
Jumper Configuration
Same as W, X except on J4.
OUT
CC, DD
Normal configuration when the transmit pre-emphasis capability
EE &
is not used. If use of pre-emphasis is desired, remove jumper
FF
OUT
from EE and add to FF.
IN
Local Audio Loopback may be controlled by an EIA signal on J1-19.
GG
Local dc Loopback may be controlled by an EIA signal on J1-13.
HH
IN
With jumper installed, the transmit audio level is reduced by 1
KK
OUT
dB .
These jumpers are not used in this model.
G, H, I,
OUT
J, K
f. Rate/Mode Display Board. One jumper is located on the rate/mode board (fig
at the modem front panel. The V.29 modem is normally shipped with the blanking
jumper removed so the indications are visible.
Rate/Mode Display Blanking Jumper
1-24
