Modem data call bypass of a telephone network voice switch

Details Modem data call bypass of a telephone network voice switch Modem data call bypass of a telephone network voice switch

1997-08-26

2000-03-07

Loomis, Paul

Telephonic communications

Telephone line or system combined with diverse electrical...

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

379 9305, 37910012, H04M 1100

Patent

active

060350202

ABSTRACT:
A data bypass system diverts data calls to a central office based modem bank and a data network at the subscriber's discretion. The data call diversion is based on a data service prefix in the user's dialing string. The data bypass device translates a subsequent telephone address of a data service supplier into a data network address. The data bypass system is either analog or digital and has a line card with a switch that selectively connects the subscriber line to the voice switch or to a data switch or router through two respective concentrators. The line card includes a data call prefix detector that controls the switch in response to a data call prefix that precedes a data call telephone number. The analog bypass system diverts a data call to a modem and a data network before the data call reaches a voiceband filter and an A/D converter of the line card, while the digital bypass system diverts the data call through a wideband filter and an A/D conversion before applying the data call to a modem accepting a digitized line signal. The digital bypass system utilizes a line card with two filter and A/D converter modules, one for voice calls and another for data calls. Instead of being in each line card, all the line cards share a telephone number and data service prefix detector located following the voice call concentrator.

REFERENCES:
patent: 4197427 (1980-04-01), Hutvheson et al.
patent: 5590406 (1996-12-01), Bayley et al.
patent: 5668857 (1997-09-01), McHale
patent: 5787363 (1998-07-01), Scott et al.
Carbone et al.; Journal article; Internet thruway: A profitable new route for data traffic, 1-8, Dec. 1996.

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