On Wed, Jan 29, 2014 at 5:34 PM, Phoebe Buckheister <phoebe.buckheis...@itwm.fraunhofer.de> wrote: > On Tue, 28 Jan 2014 23:23:17 +0400 > Dmitry Eremin-Solenikov <dbarysh...@gmail.com> wrote: >> Ok. You actually forced me to open the -2011 standard. >> Now I have the impression that LBT is a property of the channel band >> (let's call it subpage - several channels in the same page, spanning >> sequential frequencies). Am I right, or it is actually a property of >> the channel band in some countries (e.g. you may use 950Mhz with CSMA >> in countries A and B and with LBT in C). >> >> What is more correct? > > As far as I understand it, you have the choice between CSMA and limited > radio duty cycles (say, no more than 1% of air time for any given node) > or LBT and no limitations on radio duty cycles. In some bands though, > the duty cycle limit for !LBT indeed seems to be 0%, as you mentioned > with the 950 MHz band (in this case in Japan).
We need somebody with more knowledge to shed the light on the topic. >> Another and more important use case is having several 802.15.4 >> interfaces on a single phy. I had an idea of requesting capabilities >> through add_iface (so one can create one 'accelerated' iface and >> several 'unaccelerated' ones), however nobody ever implemented >> this. Maybe this part needs to be redesigned. > > Several wpan interfaces on one wpan-phy are broken as far as I can see. > Currently, adding a wpan to a phy will set the address filters, and at > least RF2xy seems to use these filters also in simple receive modes if > they have been set. For these radios, you'll have to enter promiscuous > mode either way if you have multive wpans per phy. Hmm. I should check with datasheets. If monitor functionality is broken, it needs to be fixed. Looks like hw filtering interface should be expanded with promisc mode support. > Also, each subif of a phy can have it's own channel and page. This can > lead to situations where only a subset of the wpans is capable of > receiving frames _at all_, where users will certainly expect something > else. Yes. This is a known issue though - don't use settings that won't work. Unfortunately page/channel are set through the 'start' command, and we better not touch that. -- With best wishes Dmitry ------------------------------------------------------------------------------ WatchGuard Dimension instantly turns raw network data into actionable security intelligence. It gives you real-time visual feedback on key security issues and trends. Skip the complicated setup - simply import a virtual appliance and go from zero to informed in seconds. http://pubads.g.doubleclick.net/gampad/clk?id=123612991&iu=/4140/ostg.clktrk _______________________________________________ Linux-zigbee-devel mailing list Linux-zigbee-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/linux-zigbee-devel
