ASM-20 Installation and Operation Manual Chapter 3. Operation
6/4/99 13:13 Operating Instructions 3-3
Table 3-1 Control and Indicator Functions (Cont.)
Item Name Type Function
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.
3.3 Operating Instructions
ASM-20 operates entirely unattended, except when the occasional
monitoring of LED indicators is required.
Power On
Procedure
Apply AC power by connecting the AC power cord to an acceptable AC
source. The PWR LED should light up, indicating that the ASM-20 is on. If
the local and remote ASM-20 units are in operation and passing data, the
following indicator conditions will exist:
• PWR: On
• RTS: On or Flashing
• TD: Flashing or Off
• RD: Flashing or Off
• DCD: On or Flashing
• TEST: Off.
If you do not obtain the above LED indications following initial power on,
check that the three test push buttons are not depressed.