Title: Two-wire resistance bridges for private line circuits

Abstract: 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.

Do you think this is a good invention? Vote now:

Votes so far: For:(0) Against:(0)
Other info:

Inventors: Dannenmann Jr., John E. (Portland, OR)
Johnson, Bill E. (Portland, OR)

Application Number: 06/120840
Filing Date: 1980-02-12
Publication_date: 1981-08-25
Assignee: BEJED INC

Primary Class(es): 379/206.010 333/130, 379/398
Other Classes: H04B1/58; H04M3/56; H04B1/54; H04M3/56; H04B1/58
US Patent Ref:

4140875

February, 1979

Johnson et al.

179/1CN

Four-wire, eight-leg bridge

Other Refs: GB1353367

May, 1974

179/1CN

Primary Examiner: Popek, Joseph A.
Assistant Examiner:
Attorney: Mufatti, William F.

Claims:

We clai