... is a hand-held equipment designed for 2M bit error rate test,applicable to telecommunication access networks,transmission networks ... test-Timeslot voice monitoring-Error insertion:Single&Fixed rate-Error bit test,time-slot test,signal analysis,protocol test ... CRC Error, Patten Loss, Remote AlarmError insertionSingle error insertionFixed rate error insertion: 10E-3,10E-6Serial interfaceRS-232 &. ...