Multiplex communications – Wide area network – Packet switching
Patent
1988-05-02
1991-04-02
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
375 8, 370 29, 370 30, H04B 156, H04J 1500, H04L 5111
Patent
active
050051687
ABSTRACT:
Multirate wire line modem apparatus operable at either of two rates in either transmission or reception modes is provided according to the teachings of the instant invention. Full duplex operation and echo cancellation are utilized for both voice and data. Structurally an IOP processor acts as a system controller in controlling transmission and reception digital signal processors which provide the independent transmission and reception functions of the resulting multirate modem apparatus.
REFERENCES:
patent: 4425664 (1984-01-01), Sherman et al.
patent: 4455661 (1984-06-01), Qureshi
patent: 4908823 (1990-03-01), Haagens et al.
Cummiskey Peter
Epstein Marvin
Gilmour Paul A.
Kim Richard
Chin Wellington
ITT Corporation
Olms Douglas W.
Plevy Arthur L.
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