Pulse or digital communications – Repeaters – Testing
Patent
1991-08-14
1994-03-15
Chin, Stephen
Pulse or digital communications
Repeaters
Testing
379 98, H04B 138, H04L 516
Patent
active
052951561
ABSTRACT:
Method and apparatus for effecting mode switching from a transmission mode to a command mode of an intelligent modem operatively coupled to a digital data device and a telephone line is disclosed. A termination of the modem's transmission mode is effected after a predetermined silent time interval in which no data is received from the device and prior to the transmission of additional data on the line. Operation of the modem switches to a buffer mode in which data sent from the device is temporarily stored instead of being transmitted on the telephone line. If the stored data is a proper escape sequence, operation of the modem switches to the command mode. If a proper escape sequence is not received, operation of the modem switches to a purge mode in which the stored data is transmitted on the telephone line. The apparatus comprises a data interface, a novel modem controller and a modem engine. The modem controller includes the data buffer for storing the data received from the digital data device when operating in the buffer mode.
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Fairchild, User's Manual, UA212TK Designers Kit, 1986.
Heep Jerry J.
Mosher Stephen S.
Bocure Tesfaldet
Chin Stephen
McCombs David L.
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