AUTOMATIC DATA SERVICE SELECTION

A novel and improved method and apparatus for automatically selecting the proper data service based on the data being transmitted is described. Either packet data service or modem emulation data service is selected by a wireless subscriber unit based on the data received from a computer system or ot...

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Bibliographic Details
Main Author WILLKIE, JAMES J
Format Patent
LanguageEnglish
Published 23.12.1998
Edition6
Subjects
CALCULATING
COMPUTING
COUNTING
ELECTRIC COMMUNICATION TECHNIQUE
ELECTRIC DIGITAL DATA PROCESSING
ELECTRICITY
PHYSICS
TRANSMISSION
TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHICCOMMUNICATION
WIRELESS COMMUNICATIONS NETWORKS
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Summary:A novel and improved method and apparatus for automatically selecting the proper data service based on the data being transmitted is described. Either packet data service or modem emulation data service is selected by a wireless subscriber unit based on the data received from a computer system or other digital data system. If an AT dial command is received, the wireless subscriber unit enters modem emulation mode. If packet initialization sequence is received, the wireless subscriber unit enters packet data service mode. In the preferred embodiment of the invention, a packet data initialization sequence is comprised of a pre-flag byte dead time, followed by a flag byte, followed by the reception of any additional data within a post flag time interval. Also in the preferred embodiment of the invention, the pre flag dead time is ten character time intervals and the post flag time interval is one character time interval, where a time interval is the time necessary to transmit a single byte of data at the given baud rate.
Bibliography:Application Number: NZ19970326671