Interface means

Details Interface means Interface means

1990-05-29

1992-09-29

Dwyer, James L.

Telephonic communications

Subscriber line or transmission line interface

Hybrid circuit

379402, 379399, H04M 900

Patent

active

051519364

ABSTRACT:
An interface between a bidirectional transmission channel with analog signals and four-wire input of a digital communication system. In order to enable a formatting of the interface as an integrated module in 10 V technology, a repeater or transformer is operated as an attenuation element in a lower frequency range and the transmission or, respectively, terminating impedance is selected such that all signalization voltages are transformed into a range that can be evaluated in 10 V technology, whereby, for suppressing higher-frequency noise signals, the signalization voltages are supplied via a low-pass filter to a ringing signal detector or, respectively, via a selective band-pass filter to a call charge signal detector.

REFERENCES:
patent: 4110565 (1978-08-01), Gaetano
patent: 4126765 (1978-11-01), Calder et al.
patent: 4310725 (1982-01-01), Mehaffey
patent: 4563547 (1986-01-01), Booth
patent: 4907261 (1990-03-01), Chapman
patent: 4914690 (1990-04-01), Hagedorn
patent: 4930153 (1990-05-01), Hagedorn
"A Universal Junction Interface for Digital Exchanges", by J. Ames et al Apr. 20, 1982, pp. 22-26.
"System 12 Analog Line Circuit" by J. Danneels et al, Electrical Communication, vol. 59, No. 1/2, Dec. 17, 1984, pp. 43-47.

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