... error performance testing Detailed Product DescriptionTest E1 BER, datacom interface, alarm, loop delay, large 320*240 LCD ... .28, V.35, V.36, X.21, RS-449, RS-485, RS422, EIA-530, EIA-530A datacom testing SYNCH ... Up to G.823. (4) Impedance of output interface: Balance 120Ω, up to G.703(5) Testing ... PatterlessDatacom Technical(1) Data interface type: V.24, V.35, V.36, X.21, RS-449, RS-485, EIA-530 and ...