... Normal testDirect connection modeAudio frequency testLoop delay testAutomatic protection switching time testing (APS)Datacom testCo-direcfional 64 kbit/s testFor ... )(2.2) ASYNCH mode Rate: 50,75,110,150,200,300,600,1200,2400,3600,4800,7200,9600; 14.4k ... 6V nickel-hydrogen rechargeable batteryWorking time: 8 hoursCharging: 8 hours at power-off state, and 12 hours at power-on stateDimension and weightL ...