Modem unit

Details Modem unit Modem unit

1993-03-17

1997-08-05

Woo, Stella

Telephonic communications

Telephone line or system combined with diverse electrical...

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

455558, H04M 1100

Patent

active

056550090

ABSTRACT:
A modem unit is adapted to be coupled between a land or radio telephone line and a terminal equipment. The modem unit is provided with a modem circuit for modulating data received from the terminal equipment and for demodulating data transmitted to the terminal equipment. Additionally an isolation circuit for providing a DC isolation between the telephone line and the terminal equipment is included. The modem circuit and the isolation circuit are respectively provided on a single modem integrated circuit card.

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patent: 5249218 (1993-09-01), Sainton
PCMCIA PC Card Standard, Release 2.1, Jul. 1993, pp. i-3-28.
J. Krebs, "Portable Computer and Host Talk Over Radio-Frequency Link", Electronics International, vol. 56, No. 17, Aug. 1983, pp. 142-145.
S. Edison, "Single Chip FSK Modem for Leased Line and Videotex", Electronic Engineering, vol. 56, No. 690, Jun. 1984, pp. 55-58, 61, 62, 65.
"Direct-Coupled Modem", Elektor, No. 10, Oct. 1984, pp. 48-55.
Patent Abstracts of Japan, vol. 11, No. 209 (E-521), Jul. 7, 1987 & JP-A-62 029 344 (Toshiba), Feb. 7, 1987.
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The article "Computer Shopper", Feb. 1992, p. 457.

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