Non-Standard Zigbee data rates

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I have seen that many 802.15.4 radios have non-standard data rates.  I would guess that the 250k rate will work between all radios that claim to be 802.15.4 because they are following the standard.  Now, if I were to use a non-standard data rate, I would expect all chips from a specific manufacturer to (hopefully) work with each other at any of the available data rates (i.e. a bunch of atmel radios at 2Mbps).  Now, I am trying to understand if radios from different manufacturers using non-standard bit rates would work together.  My guess is no, because the chipping sequence between radios is not standardized (802.15.4 only defines 250k as I understand it), and is likely proprietary (I've received communications from Atmel indicating this is the case).  Any info on this is appreciated.

Last Edited: Thu. Oct 15, 2015 - 09:54 PM
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I've gotten independent confirmation from Atmel that their 802.15.4 radios will indeed not work with other manufacturer's at higher data rates.

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Some actually might. In Atmel case, high data rate is achieved in a most obvious way - by removing spectrum spreading and using the entire channel bandwidth for the data. You can expect others to do a similar thing, but that has to be verified on a case by case basis.

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