microcells - Maxwell
microcells - Maxwell
microcells - Maxwell
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• The CDPD system monitors the voice channels,<br />
using those that are idle to transmit data.<br />
• When traffic is detected on the voice channel, the<br />
data transmissions cease within 40 ms.<br />
• Since this is less than the setup time for a voice<br />
call, the voice customer is not affected.<br />
• Users, once registered with the CDPD system, can<br />
transmit data as required without maintaining a<br />
continuous connection and trying up an expensive<br />
pair of voice channels.<br />
• The bit rate in the RF chennel for CDPD is 19.2<br />
kb/s, achieved using Gaussian minimum-shift<br />
keying (GMSK), a form of FSK.