System for maintaining low bit error rate in a starcoupled network of direct coupled stations

摘要: A data process system has a plurality of stations or terminals linked to star coupler over cables comprising separate sending and receiving transmission lines, the cable shield being connected ground. To minimize bit error rate when station is powered down, transmitting differential amplifier at each terminal between bias voltage virtual ground created by pair diodes in parallel, their anodes source through current limiting resistor, cathode one diode ground, other side define further enhance noise rejection, balanced network outputs transistor output wire line. The comprises resistor series transistor's emitter source, combined resistance dynamic impedance portion equal. At receiver end cabinet, coupled from for two input transistors; includes across inputs matched characteristic cable; additional resistors are ends this transistors relatively high offset amplifier.