Analog service channel port for digital interface

Details Analog service channel port for digital interface Analog service channel port for digital interface

1991-04-16

1995-12-26

Chin, Stephen

Pulse or digital communications

Pulse code modulation

3701101, 370 6, 455 677, H04B 1404

Patent

active

054794390

ABSTRACT:
An office channel unit data port is modified to incorporate a test tone detector and modified control software, to provide an analog service channel port that is capable of responding to analog test tones sourced from an analog tone-based test service facility, in order to test local and remote communication channels and analog/digital interface equipment. In addition, operation control codes have prescribed function-representative values that do not introduce disturbing `glitches` onto the analog line; instead when converted into analog format they produce respective voltages that effectively correspond to voltage levels expected to be seen by an analog channel, while conforming with the accepted practice of permitting a zero to be used in the LSB position for control code purposes.

REFERENCES:
patent: 4346476 (1982-08-01), Yamasawa et al.
patent: 4437087 (1984-03-01), Petr
patent: 4581746 (1986-04-01), Arnold
patent: 4677644 (1987-06-01), Lacroix et al.
patent: 4812815 (1989-03-01), Miyakoshi et al.
patent: 5144675 (1992-09-01), Cain et al.

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