... , bridging and monitoring);·Two clock options (internal and picking-up);·RS-232 interface for printing result;·Equidirectional 64k testing;·V.24/RS232 ... , V.35, V.36, X.21, RS-449, RS-485, EIA-530 and EIA-530A data testing.Technical Index ... : >1200ΩUnbalance bridging resistance: >750Ω.(10) Error code insertion: None, single, or ratio 10-1 ~ 10-7.Other Parameters·Power supply ...