... a hand-held equipment designed for 2M bit error rate test,applicable to telecommunication access networks,transmission ... /s BER test-Timeslot voice monitoring-Error insertion:Single&Fixed rate-Error bit test,time-slot test,signal ... code: 1111,0000, 1010Alarm indicator Signal Loss, AIS, Frame Loss, MF Remote Alarm, CRC Error, Patten Loss, Remote AlarmError insertionSingle error insertionFixed rate error ...