Bluetooth Class ratings
Posts: n/a I've seen some vendors list specifications on diffferent models and some have different class ratings. What does this signify? Is one class type better than another? What should I be looking for or does it matter? Also, should the BT interface to my PC (the USB key) and my headset have the same class/be the same class device? Thanks, Bruno Bruno <email spoofed; just remove the spam in the address>  Responses to "Bluetooth Class ratings"
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Posts: n/a Re: Bluetooth Class ratings That makes perfect sense.Thanks for the info! Bruno On Fri, 29 Jul 2005 10:07:04 +0100, Rob Shepherd <robshep@invalid.invalid> wrote: >Bruno wrote: >> Can anyone tell me what the "Class" rating on BT devices means? > >The class rating refers to the power class of the radio in the Bluetooth device. > > From the Bluetooth specification.... > >-------------------------------------- >| Power class | Maximum Power Output | >|-------------|----------------------| >| | | >| 1 | 100mW (20dBm) | >| | | >| 2 | 2.5mW (4dBm) | >| | | >| 3 | 1 mW (0dBm) | >| | | >-------------------------------------- > >This also defines the transmission range. > >Class 2 devices are by far the most common and have a nominal range of 10M. >Class 1 devices have a longer nominal range of 100M. > >Class 3 devices are relatively uncommon and have a range < 10M. >I've never seen a class 3 device marketed. > > >Obvioulsy you need a pair of class 1 devices to achieve data communication at >~100 Metres. > >HTH > >Rob Bruno <email spoofed; just remove the spam in the address>
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