Adapter for coupling together two subscribers' lines to a teleph

Details Adapter for coupling together two subscribers' lines to a teleph Adapter for coupling together two subscribers' lines to a teleph

1985-12-10

1987-07-21

Schreyer, Stafford D.

Telephonic communications

Diagnostic testing, malfunction indication, or electrical...

Of data transmission

379 22, H04M 121, H04B 346

Patent

active

046823450

ABSTRACT:
An improved two-line adapter having a pair of hold circuits for respectively placing first and second subscriber telephone lines on hold is disclosed. The individual circuits for placing the subscriber lines on hold include a circuit for continuously indicating the direction of current flow between the tip and ring lines of the individual subscriber lines to which the individual holding circuits are attached which simplifies placing conference calls between the two subscribers' lines and a telephone test set.

REFERENCES:
patent: 4517414 (1985-05-01), Boeckmann
patent: 4564728 (1986-01-01), Romano

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