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Moonman
Shootin' You The Moon
Premium
join:2001-12-30
Melbourne, ON
clubs:
| reply to glane
Re: Motorola Canopy 900 intermittent issues
of course...the obvious comes to mind. wireless phones...weather stations...baby monitors (even a neighbours might effect it) anything wireless that might be within close proximity, and operating on the 900 spectrum. do you know if there's been a new wisp providing service in your area? hell...i've even heard techs say the gas that's emitted from a soy-bean field could effect it.
i feel your pain, i've had 5 yrs of good service with mine, and the past year or so. it's gone down hill fast. i'm thinking it's over-subscribing of the AP, but try and get a ISP to admit that. after all, that's their bread n butter.
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Dave
"Agree or disagree...I really don't care. It's only a forum, and entertainment is it's fare". | |
superdog
I Need A Drink
Premium,MVM
join:2001-07-13
Lebanon, PA
 ·WaveCrazy.Net
| 900Mhz is in a world all it's own. What works today may not work tomorrow?. Canopy 900 units are some of the most stable out there when it comes to the 900Mhz frequency range. Some of the +'s to 900Mhz is that it goes thru trees much better than 2.4Ghz, so a lot of WISP's will try and use it to cover areas that otherwise would not be reachable.
The negative side to 900Mhz is that because of it's ability to travel thru trees and buildings better, it goes a LOT further than 2.4Ghz. This fact alone means that it will pick up signals that could be miles away, causing you all kinds of grief. Almost every township, borough and most utilities use 900Mhz to monitor everything from propane tanks to sewage pumps, water pressure levels and just about any other thing you can think of that needs to checked on 24/7.
In most cases, these people don't do it themselves, they bring in outside vendors or "consultants" to hook these systems up. The installers of these radios have one goal, to make it work. Even though they are only sending a few bits of data, they will use the entire spectrum to do this.
These radios are called SCADA and in most cases, they use frequency hopping units that hop thru the entire band, crushing everything around it. While the radio may not be there today, tomorrow your city may need to install a new pumping station, and when that station goes in, so does a new SCADA unit and on that same day, your connection goes to hell.
Besides the SCADA units,900Mhz is also more interference prone from other outside sources, like paging units, baby monitors and cordless phones because of it's propagation characteristics. If a neighbor in between you and the tower hooks up a baby monitor, your internet surfing could be over until junior wakes up, and then hopefully they turn it off, otherwise you are done for good.
A lot of WISP's will install 900Mhz without thinking about how large the Fresnel zone is, so if you needed 100ft at one end and 30ft at the users location for the link to work at 2.4Ghz without trees and dirt, you will need to put the 900Mhz AP a LOT higher, otherwise the Fresnel zone gets cut off and it messes up the thruput of the radios.
While none of this answers anyone's questions?, in reality, it may very well be the answer as to why your thruput has declined or become unusable. The other reasons could be over subscription of the AP, not enough bandwidth at the head end, a few users running P2P or even one of your neighbors uploading 50 pictures of their grand children for the world to see. 
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LLigetfa
join:2006-05-15
Fort Frances, ON | Hey, you forgot to mention RFID. Could be a big box store near you or a farmer counting cows. | |
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