Multiplex communications – Wide area network – Packet switching
Patent
1985-08-27
1986-06-24
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370 30, 375 7, H04L 514
Patent
active
045970734
ABSTRACT:
The disclosed data communication equipment (DCE) provides full-duplex, split-speed data communication over 2-wire dial-up telephone circuits, typically between a host processor and data terminal equipment (DTE). A telephone line interface includes low speed and high speed modems that establish a low-speed DTE-to-Host communication channel and a high-speed Host-to-DTE communication channel for split-speed full-duplex data communication. An I/O interface interfaces the DCE to the Host/DTE I/O ports at selectable asynchronous I/O speeds (typically symmetrical). A communications processor provides buffering and control functions, and implements split-speed data communication in accordance with the high-speed and low-speed communication protocols. In addition, the communication processor provides data compression for the high-speed channel, and error checking and retransmission for both the high speed and low speed channels. The DCE telephone line interface network is switchable between Host and DTE modes.
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Data Race, Inc.
Olms Douglas W.
Rokoff Kenneth I.
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