... M2100 service interrupted error testingFor Co-directional 64Kbit/s:Service-interruptedBit code testingPattern slip testingSignal loss ... 220-1, 223-1, and artificial code(7) Error code insertion: Bit error, Pattern slip, None single, Ratio ... , 220-1, 223-1, and artificial code(6) Bit error, pattern slip, none single, ratio , ... odd, even, 1, 0, none(2.3) Error code insertion: None, single, or ratio 10-1~ ...