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Front Panel Indicators 
3-1 
Chapter 3 
Operation 
This chapter provides the description of the ASM-60 front-panel indicators, and 
details the modem's operating procedures (turn-on, front-panel indications, 
performance monitoring and turn-off). 
Installation procedures given in 
 must be completed and checked before 
attempting to operate ASM-60. 
3.1  Front Panel Indicators 
The front panel of ASM-60 includes nine LED indicators that show the current 
operating status of the unit. ASM-60 also includes a proprietary 9-pin connector 
(CONTROL DCE) on its front panel for connection to a terminal. 
shows the ASM-60 front panel
 lists and describes the ASM-60 
indicators.  
 
Figure 3-1  ASM-60 Front Panel 
Table 3-1.   LED Indicators 
Name Function 
PWR (green) 
ON – Power is ON 
RTS (yellow) 
ON – DTE activates Request To Send 
DCD (yellow) 
ON– Link A, link B and internal IMUX are synchronized 
ALM (red) 
ON – An alarm enters the alarm buffer 
TD (yellow) 
ON – Data is being transmitted to the DTE 
OFF – Steady mark is being transmitted 
RD (yellow) 
ON – Data is being received from the DTE 
OFF – Steady mark is being received 
TST (red) 
Reserved for future use