Caller identification transmit path limiter

Details Caller identification transmit path limiter Caller identification transmit path limiter

1993-05-03

1994-05-24

Dwyer, James L.

Telephonic communications

Subscriber line or transmission line interface

379387, 379142, 370 32, 370 321, 3701101, H04M 100, H04M 900

Patent

active

053156501

ABSTRACT:
A transmit path limiting circuit that allows other equipment, such as a caller identification device, to more readily decipher information signals on a telephone line. The circuit includes a ring detector, register, and controller. The ring detector senses that a call is incoming to the telephone and responsively provides an initiation signal. The register normally transmits outgoing signals from the telephone to the telephone network. After receiving the initiation signal, however, the controller enables the register, for a predetermined interval, to transmit a quiet code in lieu of any signal being transmitted from the telephone. Consequently, reflected noise is lowered during the predetermined interval, so that the caller identification box may more easily interpret data on the telephone line.

REFERENCES:
Brochure excerpt, 8-Bit Embedded Controller Handbook, Intel Corporation, 1991.
Brochure excerpt, Data Book-Microcontroller, Fifth Edition, OKI Semiconductor, Jun. 1990.
Brochure excerpt, Integrated Circuits Data Handbook-80C51-Based 8-Bit Microcontrollers, Signetics Company-Philips Semiconductors, Feb. 1992.
Brochure excerpt, Telecommunications Databook, National Semiconductor Corporation, 1992 Edition.

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