Here's some ideas:1. if your user base is on 2.4 ghz then use 5.8ghz for the backhaul, especially if you want to build your system with some room to grow in the future. Using the same band for your backhaul and for your user base severely limits your throughput and pretty much ensures you have no room to grow. There's a lot of cheap 5.8 ghz gear out there that works great for backhaul. 2. shielded Cat 5/6 cable anyplace you're using cat 5/6 cable between equipment that's in a high rf environment to eliminate or reduce interference 3. ferrite beads on the coax and power cables to reduce or eliminate interference. 4. eliminate cable and use rf where ever possible for long links. Using long runs of cat 5/6 cable will introduce points of entry for rf interference and also failure points for the inevitable nearby lightning strikes.
Greg On Apr 26, 2009, at 7:41 PM, Israel Lopez wrote:
Hello There,I am a volunteer IT guy spending some time in Honduras. I sent the list an email awhile ago for some knowledgeable guys in the WISPA space and I was impressed with some of your members' willingness to help. Im sending you guys a message so i have some feedback.We are here in Juticalpa, Olancho, Honduras. We have a tower that we are housing some multi point equipment on. A low grade omni, with no back haul where other sites use to get connectivity as our Demarc for internet doesnt have LOS to all of our sites. Our sites are schools, 3 of them: Special needs, Elementary, High School. The current problem is the network is slow end to end (from Site - multipoint - demarc(internet) we have 800kbps, and 300ms) over 2.8kilometers.We are putting a plan together to build a backhaul (new radios) and possibly better antenna coverage if it is possible1) Our multipoint site has two towers available, we are using one of them.2) The second tower has an AM Radio attached to it.3) The AM Radio is broadcasting on 650Khz @ 1KW of power on the 100meter tower 4) We have a smaller tower (20Meters) with some 200mW 2.4Ghz Wifi Radio 5) This WIFI radio is acting as a bridge to other sites we cant get LOS.The idea.1) Rebuild the multi point with a 2.4Ghz back haul PTP, and a new Omni directional radio @ 300mW 2) Move the setup into the 100Meter tower on the same tower with the AM transmitter for better LOS coverage.The expectation of a problem: Will that work? Are we crazy to put a 2.4Ghz antenna @ 300mW on the same tower as an AM Transmitter on 650Khz @ 1KW. I am honestly expecting RF overload on some of the radios to cause problems. If thats not the case, then we could use the higher tower to serve an area better.We are not running a WISP here, mainly providing data connectivity between schools.Let me know what your guys's thoughts are. -Israel <Juticalpa-New.kmz> -------------------------------------------------------------------------------- WISPA Wants You! Join today! http://signup.wispa.org/ -------------------------------------------------------------------------------- WISPA Wireless List: wireless@wispa.org Subscribe/Unsubscribe: http://lists.wispa.org/mailman/listinfo/wireless Archives: http://lists.wispa.org/pipermail/wireless/
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