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florin
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AP with 3 Wireless Cards (400mW), all the same SSID

Mon Oct 17, 2005 2:20 pm

It is possible to install, one Access Point, all the wireless cards (same frequency) with one SSID.
This is due to interference and all other problems related to 3 non-over laping channels on 2.4 frequency.
With one channel and one SSID, it easy to verify one least congested channel and try ussing it, but with three channels, even non-overlaping themself, it is very hard not having problems, seeing what is becoming with 2.4.
Is it any possiblity using WDS or bridging throught bridge or any another solution.
If any of users have a solution, please write, how us this done.
Regards,
 
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engineer
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Mon Oct 17, 2005 4:53 pm

I am not able to completely understand your point but what we have implemented is three radios, three sectors, three frequencies but the same SSID. In some cases, when the customer equipment can see all the three sectors, occasionally when you refresh, it says it does not see anything and a minute later, all three pop up. I am not sure if it is a problem due to same SSID but different frequency.

Also, we are planning to use three sectors off of one radio to see what it does....I do understand that it means using same frequency on all and possible interference.

Anybody doing stuff in these lines?
 
jober
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Mon Oct 17, 2005 7:34 pm

The only problem I have had with using the same ssid is that the CPE will jump channels. So with them all on the same ssid the CPE will jump to one of the other APs and that is a bad thing if up are routing each AP, because the CPE has an IP from channel 1 AP and it jumps to channel 11 AP the traffic stops because the subnet is wrong. If you are bridging all the APs at that location then it's not a problem. But then you can't start routing at a later date with out some big changes to the CPE's and APs. Just try to think ahead.

Also if you are running one AP with 3 sectors you should remember that you will run out of elbow room fast. The extra 2 cards for the AP is not that much. And with the extra bandwidth your customers will be able to burst in speed longer then an AP with one radio. All this is assuming you have a good amount of bandwidth to hand out. If you don't then the second half of my blurb is irrelevant.

Bandwidth is not a problem for me because we resale ADSL. So it's very easy for us to bond 4 or more ADSL line to get ONE BIG FAT ASS PIPE UP AND DOWN. We use 4 lines most of the time which seems to do the trick!
1.544X14.0 We are going to bump up all the line speeds from 386X3.5 to 512X6.0. NOW THATS FAST 2.0X24.0
 
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florin
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Mon Oct 17, 2005 10:36 pm

Thanks Jober,

Also here at my case, I don't have problem with bandwidth. My only issue is how to have less problem with frequency congestion. Using for example three Wireless Cardwith 3 sectorial anntenas, and same SSID - same frequency channel, would help everybody, having less interference.
I thing it is impossible having three Wiress Cards, three sectorial antennas, each one seperate non-overlaping channel, and not interfering at least one of them, with other WISP here at my place.
The issue is how to implement this in configuration mean.
Is it using WDS, or configuring one Wireless Card, and try bridging (I don't thing so), or whatever. Before was the issue, the remote client, would be in doubt which Wiress Card to associate, which is overcome with authentication and forwarding.



The only problem I have had with using the same ssid is that the CPE will jump channels. So with them all on the same ssid the CPE will jump to one of the other APs and that is a bad thing if up are routing each AP, because the CPE has an IP from channel 1 AP and it jumps to channel 11 AP the traffic stops because the subnet is wrong. If you are bridging all the APs at that location then it's not a problem. But then you can't start routing at a later date with out some big changes to the CPE's and APs. Just try to think ahead.

Also if you are running one AP with 3 sectors you should remember that you will run out of elbow room fast. The extra 2 cards for the AP is not that much. And with the extra bandwidth your customers will be able to burst in speed longer then an AP with one radio. All this is assuming you have a good amount of bandwidth to hand out. If you don't then the second half of my blurb is irrelevant.

Bandwidth is not a problem for me because we resale ADSL. So it's very easy for us to bond 4 or more ADSL line to get ONE BIG FAT ASS PIPE UP AND DOWN. We use 4 lines most of the time which seems to do the trick!
1.544X14.0 We are going to bump up all the line speeds from 386X3.5 to 512X6.0. NOW THATS FAST 2.0X24.0
 
mgravity
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Fri Oct 21, 2005 5:31 am

For 3 radios using the same channel, I don't know you can do that.
But I have the solution for 2 radios run at the same frequency channel as well as using the same antenna array.
See this post http://forum.mikrotik.com/viewtopic.php ... ht=moto+gp
This solution also actually increase the performance on the snr