Chapter 3. Operation
ASM-20
Installation and Operation Manual
3-2 Controls and Indicators 6/4/99 13:13
PWR
1
2
3
4
5
A
E
B
C
D
7
RTS
TD
DCD
TEST
DIG
ANA
PATT
ERR
RPF
ASM - 20
Figure 3-2 ASM-20R Front Panel
Table 3-1 Control and Indicator Functions
Item Name Type Function
A DIG Pushbutton The Digital Loopback switch causes the local ASM-20 to loop
received data and clock back to its transmitter. Data Set Ready
will turn off (see
Figure 4-5
).
B ANA Pushbutton The Analog Loopback (V.54 Loop 3) switch causes the local
ASM-20 to loop its transmitter output back to its receiver (see
Figure 4-3
). This loopback may also be activated from the DTE
when DTE COMMAND ALB strap is set to EN.
C REM Pushbutton The Remote Digital Loopback (V.54 Loop 2) switch causes the
remote ASM-20 to loop received data and clock to its
transmitter (see
Figure 4-4
). Data Set Ready will turn off. This
loopback may be also activated from the terminal when DTE
COMMAND RLB strap is set to RLB EN.
D PATT Pushbutton The PATT switch causes the ASM-20 to send and receive a 511
test pattern. If errors are encountered,, the ERROR LED is ON
or blinks. Receive Data and Clear to Send will turn off.
Note
: The CARRIER jumper should be set to ON; if set to
CNTRL, the RTS signal must be high.
