|reply to superdog |
Re: Wireless users, READ THIS!
__ The real truth about WISP is that most of them truly do not understand the RF technology that they have. __
__ We do not use amps. That is what novice WISP use. __
In the hands of the inexperienced, an amp can certainly make things worse. Generally, they're best avoided.
__ ...the field tech should be evaluating the entire environment around which the equipment will sit. Here are considerations that should be taken __
Additional installation steps take more time, and since time is money...this doesn't happen too often.
__ People seem to think that if they can see the tower that all is okay, but if there is a hill in between, the height of the hill or object may project into the fresnol zone. As vegetation and seasons changes, this may disrupt the signal flow from point to point. __
Right, but there is no accurate way to predict how seasonal changes will affect the signal. Sometimes, the best signal is the only one you have.
__ Are there any electrical transformers across the field of view?
EMI "Electromagnetic Interference" can limit the range that a signal will travel. Antenna placement is critical to this issue. You do not want to shoot a signal directly across power lines, either shoot over or below them. __
I always point my antennas to where the signal strenth/quality is best. Once again, the best signal is often the one you are stuck with.
__ Is the WISP using low budget radios for their towers?
Some Wisp try to cut corners and build repeater towers on a shoestring budget. This may mean they are using off the shelf equipment like Linksys Access Points which have limitations and are not Carrier Class Equipment. We refer to these type of Wisp as Wisp Wannabes. __
Frankly, I would consider any WISP that operates in the 2.4 GHz and 5 GHz unlicensed bands to be somewhat amateur-ish, regardless of the equipment used. Selling broadband in the unlicensed bands is a risky proposition. All's it takes is a some cordless phones and home networks per every-other, few houses, and a few nasty cell carries who pillage 2.4-5 GHz spectrum for backhauls, and a mix of traditional ISAM (industrial/scientific/medical) towers/ominis here and there and your QOS takes a nose dive, taking your business with it.
__ What is the latency (ping time) from your computer to the Wisp's gateway?
Ping times to the Wisp gateway should not exceed 20 ms. We have clients who traverse over 5 tower hops exceeding 80 miles in distance who have ping times less than 15 ms. __
That latency is fine, but if a residential customer begins experiencing delays because his neighbor just bought flavor of the month Linksys WAP signal-booster-thingy there is nothing you can do about it. Suddenly, your reputation is on the line.
__ Does the client have any 2.4 gHz equipment within their home? 2.4 gHz phones will cause problems to the data transmission when the phone is in service. Also, be careful when using wireless routers. Depending on what channel you use, you may be using the same frequency that the client radio is trying to use for communication to the tower. __
Interfering with one's self. Not only does a WISP have to higher microwave engineers, but Panasonic/Sony/Uniden/VTech phone experts.
I don't disagree with what you're saying. I just think WISPs who operate in the unlicensed bands risk having the rug pulled from under them. I think the FCC should allocate a WISP only spectrum. This will probably eliminate 75% of the interference: home networks, cordless phones, ISAM networks, and gay-ass cell providers who use unlicensed for backhauls (which should be prohibited if you ask me). The problem with cell backhauls is these a**holes overpower there links often by several WATTS, totally illegal, but do they care? No.