Telephonic communications – Telephone line or system combined with diverse electrical... – Having transmission of a digital message signal over a...
Patent
1987-07-31
1991-01-22
Ng, Jin F.
Telephonic communications
Telephone line or system combined with diverse electrical...
Having transmission of a digital message signal over a...
379 98, 379102, 379184, H04M 1100, H04M 168
Patent
active
049875868
ABSTRACT:
A modem/telephone interconnect for sharing a telephone line or communication channel between a modem and a telephone or other communication device. The interconnect provides access to the telephone line by both devices but normally prevents each device from interrupting or interfering with the operation of the other. The telephone can be used to monitor data transfer by the modem without the possibility of interfering with the data signals or quiet times.
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K. D. Witt, "Switch Box for Voice/Data Communication", IBM Technical Disclosure Bulletin, vol. 14, No. 5, Oct. 1971, pp. 1606-1607.
Gross Allen E.
Malm Marvin F.
Chan Wing F.
Compaq Computer Corporation
Ng Jin F.
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