Multiplex communications – Wide area network – Packet switching
Patent
1984-02-17
1986-03-25
George, Keith E.
Multiplex communications
Wide area network
Packet switching
370 30, 375 8, H04M 1100
Patent
active
045785333
ABSTRACT:
A modem for coupling a data terminal or other apparatus to a telephone line and deriving its operating power for both transmitting and receiving operation from the telephone line, and providing electrical isolation between the telephone line and the data terminal. The modem is switchable to provide orginate or answer operation in either of two operating frequency bands.
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George Keith E.
Universal Data Systems, Inc.
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