H - Electricity – 04 – N
Patent
H - Electricity
04
N
H04N 7/173 (2006.01) H04B 7/185 (2006.01) H04N 7/24 (2006.01) H04Q 7/12 (2006.01) H04Q 7/14 (2006.01) H04H 3/00 (2006.01) H04H 9/00 (2006.01)
Patent
CA 2147837
In a two-way interactive commu- nication video network having a ne- twork switching center (2) for point-to- point communications between sub- scribers at different geographic loca- tions, a local base station (3) configura- tion is provided for facilitating low power battery operated portable sub- scriber units (17). The local subscriber units surrounding a base station are adapted for multiplex transmission of digital messages synchronously related to a broadcast television signal for sys- tem coordination. Digital messages are transmitted from the local subscriber units to the base station data process- ing facility through a set of receive on- ly cell site subdivision zones distribut- ed over the base station transmitter geographical range, which communi- cate with the base station data processing facility over a communication link such as wired cable. Messages are compiled and rel- ayed by satellite to a network switching center transmitter site for nationwide point-to-point communications. Small-size, inex- pensive, low-power, portable, digital-transmitting subscriber units are introduced compatible with interactive video data system standards with the ability to cross subdivision and cell zones. Thus, monitoring of inventory, temperature, and other parameters for passive automatic alarm systems and the like, as well as active mobility of subscriber units for meter reading and the like is made possible with direct low-cost nationwide real time reporting capability.
Eon Corporation
Sim & Mcburney
LandOfFree
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