Telephonic communications – Telephone line or system combined with diverse electrical... – Having transmission of a digital message signal over a...
Patent
1991-10-07
1993-11-30
Ng, Jin F.
Telephonic communications
Telephone line or system combined with diverse electrical...
Having transmission of a digital message signal over a...
379 94, 371 204, 375 10, 370 13, H04M 1100, G06F 1100, H04B 1700
Patent
active
052673006
ABSTRACT:
A dialed telephone connection can be implemented as an end-to-end digital connection by virtue of switched voice transmission facilities becoming more prevalent. If such a connection is detected, it is possible to transmit digital data over the connection at a much higher rate than using analog technology. A dialed voice call is emulated to set up such a connection and the connection is then tested to determine if it is end-to-end digital. If so, high speed digital data can be passed. If not, the connection is broken and then reestablished repeatedly until such a digital connection is found. In one embodiment, the calls are alternately initiated from each of the two parties involved in attempts to increase the likelihood of achieving an end-to-end digital connection. If no such connection can be obtained after a reasonable number of tries, an analog communication session can be established.
REFERENCES:
patent: 3596245 (1971-07-01), Finnie
patent: 4549049 (1985-10-01), Guidoux
patent: 4642697 (1987-02-01), Wada
patent: 4956860 (1990-09-01), Murata
patent: 4961185 (1990-10-01), Sawada
patent: 5134611 (1992-07-01), Steinka et al.
Kao Ming-Luh
Miller Jerry A.
Chan Jason
Miller Jerry A.
Newton William A.
Ng Jin F.
Racal-Datacom, Inc.
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