Terminal repeater having a function for repeating DC loop signal

Details Terminal repeater having a function for repeating DC loop signal Terminal repeater having a function for repeating DC loop signal

1991-06-04

1992-02-04

Dwyer, James L.

Telephonic communications

Repeater

Having line length compensation or equalization

379338, 379413, H04M 100

Patent

active

050864629

ABSTRACT:
A terminal repeater placed in at least one communication line connecting an exchange and at least one terminal device, comprising a DC cut-off circuit providing continuous paths for AC signals flowing through the lines while providing discontinuous paths for DC signals flowing through the communication line, a DC power supply circuit generating a DC power used in place of a DC power supplied through communication line from the exchange, and supplying the generated DC power to terminal device, a DC loop signal detecting circuit comparing a threshold level with a level of a DC loop signal as is transmitted from the terminal device to the exchange, and generating a signal corresponding to the DC loop signal, and a pseudo-DC loop signal transmitting circuit, when the DC loop signal detecting circuit generates a signal, the pseudo-DC loop signal transmitting circuit controlling a C state of the communication line in accordance with the signal generated by the DC loop signal detecting circuit, thereby to transmit a pseudo-DC loop signal analogous to the DC loop signal detected by the DC loop signal detecting circuit.

REFERENCES:
patent: 3166642 (1965-01-01), Abbott
patent: 3916110 (1975-10-01), Lee et al.
patent: 4251691 (1981-02-01), Kakihara et al.
patent: 4623760 (1986-11-01), Binkerd et al.
patent: 4802207 (1989-01-01), Uchida
patent: 4811389 (1989-03-01), Balch

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