Two-wire resistance bridges for private line circuits

摘要

A family of improved 2-wire resistance bridges having from 3 to 14 ports, or legs, is provided for use in interconnecting a plurality of stations or devices in a private line circuit. The bridges include a resistance connected in shunt across the common end of each leg in the bridge, which permits the intrinsic port-to-port loss of the bridges to be adjusted to a desired value that essentially equals the difference between standard toll line input and output power levels, while at the same time maintaining the proper terminating impedance for each of the interconnected devices.