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ASM-20 Installation and Operation Manual Chapter 4 Troubleshooting and Diagnostics
Communication Link Tests 4-5
RCVR
RCVR
LOCAL
DATA
TERMINAL
XMTR
XMTR
LOCAL ASM-20
REMOTE ASM-20
DATA
DATA
CLK
CLK
REMOTE
DATA
TERMINAL
REM
Pressed
Figure 4-4. Remote ASM-20 in Digital Loopback
Local Digital Loopback
This test is activated by pressing the DIG push button. It loops the received data
back to the remote ASM-20. (This test is equivalent to activating the remote
loopback from the remote ASM-20 – see Figure 4-5). The operator at the remote
end can determine the performance of the local and remote ASM-20 units, and
the lines between them.
The modem with the pressed DIG push button must be in RCV or ASY mode
RCVR
RCVR
DI
G
Pressed
LOCAL
DATA
TERMINAL
XMTR
XMTR
LOCAL ASM-20
REMOTE ASM-20
DATA
DATA
CLK
CLK
REMOTE
DATA
TERMINAL
Figure 4-5. Local ASM-20 in Digital Loopback
Note