Pulse or digital communications – Repeaters – Testing
Patent
1985-11-18
1987-10-13
Safourek, Benedict V.
Pulse or digital communications
Repeaters
Testing
371 49, 375111, 379 93, 379 97, H04L 2702
Patent
active
047003588
ABSTRACT:
An improved modem is described which can selectably operate in a synchronous communications mode, an asynchronous data mode, and an asynchronous command mode. A processor 47 controls the operation of the modem, adds starting and ending flags and frame check sequences to transmitted data, searches for flags and sync characters in received data, adds and deletes start, stop and parity bits required for communications with the asynchronous communications element 18, and performs zero bit insertion and deletion for HDLC/SDLC communications. Processor 47 also controls and monitors the operating parameters of the modem engine 60.
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International Standard ISO-646-1973 (E).
Duncanson Jay P.
Murray Mark R.
Hayes Microcomputer Products, Inc.
Safourek Benedict V.
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