33
LDM-144LR
Figure 5-2. LDM-144LR in Remote Digital Loopback.
5.2.3 L
OCAL
D
IGITAL
L
OOPBACK
(DIG)
The Local digital loopback (DIG) consists of looping the received data back
to the remote LDM-144LR, as shown in
Figure 5-3
. Using this test, the
operator at the remote end can determine the performance of the local and
remote LDM-144LR units, and the communication lines interconnecting
them.
Figure 5-3. Local LDM-144LR in Digital Loopback.
RCVR
XMTR
LOCAL
DATA
TERMINAL
RCVR
XMTR
REMOTE ASM-24
LOCAL ASM-24
REMOTE
DATA
TERMINAL
DATA
DIG pressed
CLK
CLK
DATA
DATA
REM pressed
CLK
CLK
DATA
RCVR
XMTR
LOCAL
DATA
TERMINAL
RCVR
XMTR
REMOTE ASM-24
LOCAL ASM-24
REMOTE
DATA
TERMINAL
LOCAL LDM-144LR
REMOTE LDM-144LR
LOCAL LDM-144LR
REMOTE LDM-144LR
