35
SHM-768K
Figure 5-4. Remote SHM-768K in Digital Loopback.
5.6.2 L
OCAL
D
IGITAL
L
OOPBACK
This test is activated by depressing the DIG pushbutton. It loops the received
data back to the remote SHM-768K. (This test is equivalent to activating
the remote loopback from the remote SHM-768K—refer to Figure 5-5).
The operator at the remote end can determine the performance of the
local and remote SHM-768K units, and of the lines between them.
Figure 5-5. Local SHM-768K in Digital Loopback.
DATA
DATA
CLK
CLK
RCVR
XMTR
DIG
DEPRESSED
REMOTE
DATA
TERMINAL
RCVR
XMTR
LOCAL ASM-45
REMOTE ASM-45
LOCAL
DATA
TERMINAL
DATA
CLK
CLK
DATA
RCVR
XMTR
REM
DEPRESSED
LOCAL
DATA
TERMINAL
RCVR
XMTR
REMOTE ASM-45
LOCAL ASM-45
REMOTE
DATA
TERMINAL
