Automatic data restoral for modems

Details Automatic data restoral for modems Automatic data restoral for modems

1993-02-22

1993-12-28

Ng, Jin F.

Telephonic communications

Telephone line or system combined with diverse electrical...

Having transmission of a digital message signal over a...

370 16, 371 82, 371 112, H04M 1100

Patent

active

052746976

ABSTRACT:
Automatically restoring data transmission by monitoring line degradation and switching to a new line (or lines) when line quality falls below a prescribed standard. Data transmission is maintained on the leased line while communication is being established on the dial line, so as not to disrupt data transmission; communication is established across two dial lines to restore full-duplex transmission; energy is maintained on the dial lines at times when data is not being transmitted to prevent a change of channel on a dial line; a signal processor, associated memory, and analog interface circuitry provide the data restoral functions; control of the restoral procedure is handled by one modem (e.g., the calling modem), and commands are sent to the other modem over either the leased or dial lines.

REFERENCES:
patent: 4076961 (1978-02-01), Holsinger et al.
patent: 4716582 (1987-12-01), Blanchard et al.
patent: 4910763 (1990-03-01), Caron et al.
patent: 5010550 (1991-04-01), Hirata
patent: 5048054 (1991-09-01), Eyuboglu et al.
patent: 5138609 (1992-08-01), Hashimoto

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