28
LDM-144LR
Table 4-2. Controls and Indicators (continued).
DIG
Control
When depressed, loops the local
LDM-144LR receiver output back to its
transmitter, as shown in
Figure 5-3
.
The looped data is synchronized to the
transmit clock.
The DSR signal is set to the low state.
ANA
Control
When depressed, loops the local
LDM-144LR transmitter output back to
its receiver, as shown in
Figure 5-1
(Analog
Loopback per V.54, loop 3) This loopback
may also be activated from the DTE when
“DTE Command ALB” jumper is set to EN.
REM
Control
When depressed, loops the remote
LDM-144LR receiver output back to its
transmitter, as shown in
Figure 5-2
(Remote
Digital Loopback per V.54, loop 2). The
looped data is synchronized to the transmit
clock. This loopback may also be activated
from the DTE when “DTE Command RLB”
jumper is set to RLB EN.
PATT
Control
When depressed, the LDM-144LR transmits
and receives a 511-bit test pattern. If errors
are detected in the received pattern, the
ERR indicator is turned on or blinks. The
Receive Data and CTS signals are set to
the low state.
