harvSki
Premium
join:2004-03-09
Suffolk, UK
| reply to harvSki
Re: pop goes my fresh AP
OK, I've managed to knock this diagram up in my lunch break, I've also discovered I can zoom into the graph on PRTG and notice that the client device where this data is coming from saw a signal drop just before losing contact with the AP (Osbridge). I also checked the uptime and no devices stopped running at all and the MikorTik in the diagram also stayed in contact with the wired side of the AP too.
remember the blue/grey line at the top of the graph is for ref from another system in another village. |
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superdog
I Need A Drink
Premium,MVM
join:2001-07-13
Lebanon, PA
| OK, what other devices are on the roof?. Do any of Your CAT5 cables run very close to any electrical wires. Is the OSbridge AP in a plastic enclosure by any chance?
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lutful
Premium
join:2005-06-16
Ottawa, ON
 ·TekSavvy Solutions..
| reply to harvSki
said by harvSki  :a signal drop just before losing contact with the AP (Osbridge). Several high power CPEs with 24dB grid very close to the omni could be saturating the receiver - many CMOS chipsets will fail with just 1 milliwatt total power input.
You really need to measure the maximum 2.4Ghz RF power that is being "seen" at the LMR400 end of the 15dB omni.
Replacing APs after APs will cost you more and more  |
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harvSki
Premium
join:2004-03-09
Suffolk, UK
| I will try and measure the RF at the end of the LMR400, the 24db grid is 5 metres away from the Omni and all the clients are ETSI standard 20dbi EIRP max and hundreds of meters away.
What has me really puzzled is the hour and a half gap in the data, I didn't lose contact with the access point at this time but the clients disconnected. If it was static does this mean it lasted 1.5hrs and then was gone? |
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lutful
Premium
join:2005-06-16
Ottawa, ON
·TekSavvy Solutions..
| said by harvSki :What has me really puzzled is the hour and a half gap in the data, I didn't lose contact with the access point at this time but the clients disconnected. If it was static does this mean it lasted 1.5hrs and then was gone? Our experience with static is that LAN port dies earlier than RF port. Also, static discharge is momentary.
However, if the AP was exposed to more than 1mW RF input even for a short period it is possible for all clients to lose connection since the driver could have locked up.
IMHO, the "more than 1mW RF input" theory needs to be confirmed or eliminated at your leisure. |
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