Synchronous/asynchronous modem

Details Synchronous/asynchronous modem Synchronous/asynchronous modem

G - Physics

06

F

354/104, 325/16,

G06F 13/42 (2006.01) G06F 13/38 (2006.01) H04M 11/06 (2006.01)

Patent

CA 1251263

SYNCHRONOUS/ASYNCHRONOUS MODEM" 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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