Adc Telecommunications, Inc.

Pacific Communication Sciences, Inc.

Gail Schjelderup

Kumar Balachandran

Seton Paul Kasmir

Steven H Gardner

Mark T Robinson

Sue Graham

Matt Wong

Roy Franklin Quick, Jr

Roy F Quick

A cellular digital packet data (CDPD) system includes a mobile data base station (MDBS) configured to interface easily with an advanced mobile phone system (AMPS). The elements of the MDBS are arranged on modules and the functionality of the MDBS is divided among the modules to facilitate flexibility, compactness and quick expansion of the MDBS. To further facilitate compactness, the MDBS includes a transceiver/modem board which uses a single chip to carry out delta-sigma modulation. In order to maintain the integrity of CDPD transmission, a channel hopping scheme is used based upon avoidance of AMPS channel use. A distinctive protocol is used to encapsulate control/query/response data for transmission throughout the CDPD system. This protocol also facilitates easy control of each MDBS throughout the system.

Cellular digital packet data mobile data base station

Cellular digtial packet data mobile data base station

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Poway, CA, United States of America

Gail Schjelderup