Thread: [Aironet] Re: Why two antenna connectors
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From: Jonas S. <sa...@co...> - 1999-11-11 22:02:09
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Hi all! The reason that there are 2 antenna connectors are for a feature called "diversity antennas". The idea is that when you have problems due to reflections (multi-path), if you have two antennas (physically separated) for receiveing the card can choose which one that has the best signal quality based on the quality of the preamble that each radio packed starts with. The odds are actually quite good that if you have problems due to multipath signals, they wont affect both antennas. It is configurable whether you want to send on one connector and receive on the other, send/receive on the same one or use the diversity feature descr. above. Cheers, /Jonas Sanamon On Wed, 10 Nov 1999 air...@cs... wrote: > > Send Aironet mailing list submissions to > ai...@cs... > > To subscribe or unsubscribe via the web, visit > http://csl.cse.ucsc.edu/mailman/listinfo/aironet > or, via email, send a message with subject or body 'help' to > air...@cs... > You can reach the person managing the list at > air...@cs... > > When replying, please edit your Subject line so it is more specific than > "Re: Contents of Aironet digest..." > > > Today's Topics: > > 1. starting of experimenting with driver (Samudra E. Haque) > 2. Re: starting of experimenting with driver (br...@al...) > > --__--__-- > > Message: 1 > Date: Wed, 10 Nov 1999 11:25:18 +0600 > From: "Samudra E. Haque" <ha...@pr...> > Organization: PraDeshta Limited > To: "ai...@cs..." <ai...@cs...> > Subject: [Aironet] starting of experimenting with driver > > hello, I have a number of production servers that are 2.0.36 based linux > distributions, self-rolled or based on old slackware distro's. > > Also, I have in the past successfully made a stripped down version of > the above, demand dial routers so I do understand that it is possible to > incorporate and rearrange the file system and its packages. > > Looking at the available meager docs on drivers for the 4800 pci adapter > Aironet card, and the fact that it is actually a PCMCIA card disguised > in a PCI adapter.. would someone please enlighten me what minimum > software packages I need to install to activate the ethernet interface ? > > Initially I would try with a tried and trusty pair of Radio NICs in > adhoc mode, short range with omni antennas. Would 2.0.36 linux have the > required features ? I would really like to contribute in any form of > beta testing or stress testing network as we have a good research > environment and plenty of hardware to test it on (and space too :-) > > I notice the output of the NIC is max 100 mW, but does anybody know the > type of cable that they use on the output port of that card (it is > extremely thin in dia.) or why they have TWO ports on their cards but > only use one ? > > =samudra haque > dhaka, bangladesh > > --__--__-- > > Message: 2 > From: br...@al... > To: "Samudra E. Haque" <ha...@pr...> > cc: "ai...@cs..." <ai...@cs...> > Date: Tue, 9 Nov 1999 22:55:23 -0800 > Subject: Re: [Aironet] starting of experimenting with driver > > > > If you are using PCI you only need the airo.c file and compile it as > described in the README. It would be great if someone would make sure the > 2.0 stuff is working and support those still on 2.0. I have been trying to > make sure that it keeps working (and I think it still does), but I'm > running out of 2.0 machines to test with. > > They do use the two ports to transmit and recieve. I'm not sure why. (I > don't have an RF background.) You can control via the > /proc/aironet/ethX/Config file which are used. > > ben > > > "Samudra E. Haque" <ha...@pr...> on 11/09/99 09:25:18 PM > > To: "ai...@cs..." <ai...@cs...> > cc: > Subject: [Aironet] starting of experimenting with driver > > > > > hello, I have a number of production servers that are 2.0.36 based linux > distributions, self-rolled or based on old slackware distro's. > > Also, I have in the past successfully made a stripped down version of > the above, demand dial routers so I do understand that it is possible to > incorporate and rearrange the file system and its packages. > > Looking at the available meager docs on drivers for the 4800 pci adapter > Aironet card, and the fact that it is actually a PCMCIA card disguised > in a PCI adapter.. would someone please enlighten me what minimum > software packages I need to install to activate the ethernet interface ? > > Initially I would try with a tried and trusty pair of Radio NICs in > adhoc mode, short range with omni antennas. Would 2.0.36 linux have the > required features ? I would really like to contribute in any form of > beta testing or stress testing network as we have a good research > environment and plenty of hardware to test it on (and space too :-) > > I notice the output of the NIC is max 100 mW, but does anybody know the > type of cable that they use on the output port of that card (it is > extremely thin in dia.) or why they have TWO ports on their cards but > only use one ? > > =samudra haque > dhaka, bangladesh > > _______________________________________________ > Aironet mailing list - Ai...@cs... > http://csl.cse.ucsc.edu/mailman/listinfo/aironet > > > > > > > --__--__-- > > _______________________________________________ > Aironet mailing list - Ai...@cs... > http://csl.cse.ucsc.edu/mailman/listinfo/aironet > > > End of Aironet Digest > |