VariableARK
join:2003-03-17
USA
| Strange issues with ap
On one of my towers I have 3 120 degree sectors, running channels 1,6,11. Several clients on the ap on channel 11 recently have been having issues where the signal has varied ALOT, and the received signal level is much lower than it should be. (By about 5 db, but sometimes more).
I went up to the tower and changed the radio, and the same thing occurred. I checked the cable for signs possible leaks at the connectors, and there wasnt any indications of a bad cable.
Then I changed the channel to 6, and everything began working again like normal. To me this seems to be interference, does this seem correct? And is there anything I can do about it?
Thanks |
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rawgerz
In Debt we trust
Premium
join:2004-10-03
Grove City, PA | Whats the AP and CPE's?
Maybe this
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"Hows your French toast?" "Smelly and ungrateful, but this AMERICAN toast is great!" |
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John Galt
Forward, March
Premium
join:2004-09-30
Happy Camp | reply to VariableARK
All the clients having problems in close proximity?
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A is A |
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VariableARK
join:2003-03-17
USA | reply to VariableARK
That particular ap and cpes are all nl2611s.
would a bandpass filter help if the interference is on ch11? |
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rawgerz
In Debt we trust
Premium
join:2004-10-03
Grove City, PA | I don't believe they help on the same channel |
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VariableARK
join:2003-03-17
USA | reply to VariableARK
thats pretty much what i knew, well, looks like its time for me to get a spectrum analyzer. Maybe ill be lucky and its coming from above and a simple bandpass filter will help. |
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rawgerz
In Debt we trust
Premium
join:2004-10-03
Grove City, PA
 ·Verizon Online DSL
 ·Sprint Mobile Broa..
| reply to VariableARK
So the AP and CPE's are these? »www.wlanparts.com/product/NL2611CB3PLUS
If so I would consider upgrading equipment to something more 'professional' and pick up one from Deliberant or HGA's.
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"Hows your French toast?" "Smelly and ungrateful, but this AMERICAN toast is great!" |
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kf6ytc
join:2002-03-26
Turlock, CA | I don't think he came here to be told what 'professional' is... the cb3's are a good radio. now hopefully someone will chime in and help you out :|
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rawgerz
In Debt we trust
Premium
join:2004-10-03
Grove City, PA
·Verizon Online DSL
·Sprint Mobile Broa..
| reply to VariableARK
I think he said that the other AP's are different so I figured swaping out that AP might help with something with better specs?
Besides just my 2 cents which is why I had it as 'professional'
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"Hows your French toast?" "Smelly and ungrateful, but this AMERICAN toast is great!" |
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superdog
I Need A Drink
Premium,MVM
join:2001-07-13
Lebanon, PA
| reply to kf6ytc
said by kf6ytc  : the cb3's are a good radio. I suppose their are some that would agree with You?. I don't have any on my network, nor will You find one any time soon. When looking at radios and then looking at failure rates, the CB3's are up there. While some may have had very good luck with them, others have ripped out every single one and replaced them with units from Deliberant and High Gain. I think the point was that this person should try another AP(From another OEM) before pulling their hair out, renting an SA and spending a lot of sleepless nights until the issue is fixed.Some radios just do not like any kind of noise in the band they are operating in, and maybe the CB3 is one of them?.
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IntraLink
Premium,MVM
join:2002-08-14
Utah Valley
| And there are some that have ripped out all of their Deliberants and gone with something else more 'professional'. So that is a relative term I guess...
The spectrum analyzer is the way to go. You can rent a decent one from Electrocom or several other vendors for much less than purchasing one. |
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lutful
Premium
join:2005-06-16
Ottawa, ON
·TekSavvy Solutions..
| reply to VariableARK
said by VariableARK :Several clients on the ap on channel 11 recently have been having issues where the signal has varied ALOT, and the received signal level is much lower than it should be. (By about 5 db, but sometimes more). The Ubicom firmware has a bug/oversight where it stops scanning for AP SSID as soon as a "good-enough" RSSI is observed during scanning.
But the CPE firmware starts scanning at CH1 and sometimes a strong CH11 AP could be mistakenly "found" at a lower channel like CH7 and other times at CH9 and very rarely at CH11.
Adding a good filter at CH11 AP will help. |
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VariableARK
join:2003-03-17
USA
| reply to VariableARK
I am still looking to get a SA, just because it is probably one of the more useful tools a WISP can have. I may try just getting a bandpass filter, but I dont want to just start aimlessly buying things. Are the Hyperlink bandpass filters quality? Would you all recommend the 4 pole or 8 pole filter? 4 pole says a rejection of 45db and a loss of 2db; while the 8 pole says a rejection of 60db and a loss of 3db.
As far as the senao as an AP, I trust them quite abit more than most APs, and have at least 1 in a higher noise environment.
When I scanned for noise just with my avaya/orinoco client utility I didnt get anything worse than about -98, but I dont know how accurate that is? |
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rawgerz
In Debt we trust
Premium
join:2004-10-03
Grove City, PA
·Verizon Online DSL
·Sprint Mobile Broa..
| anything beyond -80 dbm is pretty low.
I recommended the other brands because many people here use them, HGA units are rumored to amplify the received signal also so they can be useful in higher noise applications
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"Hows your French toast?" "Smelly and ungrateful, but this AMERICAN toast is great!" |
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TWireless
Premium
join:2006-04-03
Round Rock, TX
| If the receiver amplifies the received signal that would include amplifying the noise. I don't see how that would benefit anything. I could be wrong, but a filter sounds like a better choice.
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Tasos Alexiou
www.titanwirelessonline.com |
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John Galt
Forward, March
Premium
join:2004-09-30
Happy Camp
·CenturyLink
| said by TWireless :I could be wrong, but a filter sounds like a better choice. It is necessary to evaluate everything as a system. When you evaluate things in this manner you make informed choices and trade-offs.
That is not to say that a filter isn't necessary...but how does it fit in with the performance objectives for the WHOLE system??
[/rhetorical question]
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A is A |
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joshg409
join:2005-05-03
Ottumwa, IA
| reply to VariableARK
If you don't have an SA available, it would seem to me that if the signal is bad with the sector on 11 facing one way and you have another sector on 6 facing another way you should flip flop the channels. You stated that changing the 11 sector to 6 solved the problem, change the original 6 secotr to 11. You still have the three non-overlapping channels preserved. Hopefully the interferrence on the original channel 6 sector won't have interferrence on 11 facing the same direction. |
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