H - Electricity – 04 – B
Patent
H - Electricity
04
B
H04B 7/26 (2006.01) H04M 11/06 (2006.01) H04Q 7/22 (2006.01)
Patent
CA 2133730
2133730 9418782 PCTABS00033 A method and apparatus differentiate between voice calls and data calls in a cellular telephone network. A data signal discriminator (612) at cellsites (602) to independently monitor cellular channels and detect the presence of modulated data, and generation of predetermined signals by a cellular modem or interface circuit, such as dialing string instructions, periodic tones or periodic dta patterns during call placement, which are detectable to identify data calls.
Kent & Edgar
Spectrum Information Technologies Inc.
LandOfFree
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