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ASM-20 Installation and Operation Manual Chapter 3 Operation
Controls and Indicators 3-3
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.
E RPF RESET Pushbutton Resets ERR/RPF LED (only available in ASM-20/R).
1 PWR LED Indicator Green LED is on when power is on.
2 RTS LED Indicator
ITU 105
Yellow LED is on when terminal activates Request to Send.
3 TD LED Indicator
ITU 103
Yellow LED is on when steady SPACE is being transmitted. It
flickers when data is transmitted.
4 RD LED Indicator
ITU 104
Yellow LED is on when steady SPACE is being received.
It flickers when data is received.
5 DCD LED Indicator
ITU 109
Yellow LED is on when a valid receive signal is present.
6 TEST LED Indicator
ITU 142
Red LED is on when the ASM-20 is in any of the three loopback
modes or PATT mode.
7 ERR/RPF LED Indicator ERR: Yellow LED goes ON momentarily when PATT switch is
activated and then goes out. If there are errors in the test
pattern, the LED blinks or remains ON.
RPF: Indicates power failure in remote standalone units
(ASM-20/R only). Reset by depressing RPF reset push button.