16-03-00 15:51 Controls and Indicators 3-1
Chapter 3Operation
This chapter provides the following information for the ASMi-31 standalone
modem:
• ASMi-31 front-panel indicators and controls
• Operating procedures (turn-on, front-panel indications, performance
monitoring and turn-off).
Installation procedures given in Chapter 2 must be completed and checked
before attempting to operate ASMi-31.

3.1 Controls and Indicators

Figure 3-1 illustrates the ASMi-31 standalone modem front panel. Table 3-1
lists the functions of the controls and indicators.
PWR RTS TD RD DCD LOS ERR TEST RESET
Figure 3-1 ASMi-31 Front Panel
Note
In ASMi-31 modem/X.21 RTS LED is equivalent to Control signal (C), and
DCD LED is equivalent to Indication signal (I).
Table 3-1 Front Panel Controls and Indicators
Name Type ITU Circuit Function
RESET Button This switch resets the unit; it is used in place of a power switch.
It is not needed for normal operation.
PWR Green LED On when ASMi-31 is powered up.
RTS Yellow LED 105 On when the DTE has emitted an active Request to Send signal
(or Control in X.21).
TD Yellow LED 103 On when a steady space is being transmitted.
Blinks when data is transmitted.
RD Yellow LED 104 On when a steady space is being received.
Blinks when data is received.
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