Telecommunications – Radiotelephone system – Emergency or alarm communication
Patent
1999-01-22
2000-09-05
Eisenzopf, Reinhard J.
Telecommunications
Radiotelephone system
Emergency or alarm communication
455432, 455552, 455102, H04Q 732, H04M 1100
Patent
active
061155993
ABSTRACT:
A method for use in a dual mode wireless communication system supporting at least a first modulation method and a second modulation method, wherein the first and second modulation methods are used on different RF channels, wherein a wireless transmitter is capable of supporting both modulation methods, and wherein it is preferred that emergency 911 calls generally take place with the first modulation method, comprising the steps of: when the wireless transmitter is currently using the second modulation method and attempts to originate a call to 911, causing the wireless transmitter automatically to switch to the first modulation method; and originating the call to 911 using the first modulation method on one of the set of RF channels prescribed for use in the first modulation method.
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Eisenzopf Reinhard J.
Kincaid Lester G.
TruePosition, Inc.
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