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Chapter 3  Operation 
ASM-60 Installation and Operation Manual 
3-2 Operating 
ASM-60
 
 
Table 3-1.  LED Indicators (Cont.) 
Name Function 
SYNC A (red/green)  
ON (red) – Data link A is not synchronized with the remote modem 
ON (green) – Data link A is synchronized with the remote modem 
SYNC B (red/green)  
ON (red) – Data link B is not synchronized with the remote modem 
ON (green) – Data link B is synchronized with the remote modem 
3.2 Operating ASM-60 
Turning On ASM-60 
ASM-60 is turned on as soon as the power is connected to the unit. The PWR 
indicator lights up and remains lit as long as ASM-60 receives power. 
Normal Operation 
Always operate ASM-60 in pairs: ASM-60/CO opposite ASM-60/CPE. 
ASM-60 requires no operator attention once installed, with the exception of 
occasional monitoring of front panel indicators. Intervention is only required when 
ASM-60 must be adapted to new operational requirements. 
Normal Indications 
 shows the status of the ASM-60 indicators, a few seconds after 
power-up. 
Table 3-2.  ASM-60 Indicator Status 
Indicator Status 
PWR ON 
TD 
Depends on DTE data transmission 
RD 
Depends on DTE data transmission 
RTS 
Depends on DTE RTS signal status 
DCD 
Depends on remote modem data transmission 
TST OFF 
ALM OFF 
SYNC A/SYNC B  Green or red, depending on remote modem data transmission 
If the above LED indications are not obtained following initial power turn-on, refer 
to 
 for the diagnostic test instructions. 
Turning Off ASM-60 
To turn off ASM-60, remove the power cord from the power source.