These units are reliable. But not beyond their capable range. The
manufacturer's path calc tool is pretty accurate, except maybe off by about
one 9 reliabilty. (meaning use three 9 chart for two 9 real world.) In a
recent Siminar on GB, Sprint interestingly brought up the situation that
explained all rain is not the same and the rate of rain fall, that most
tools use, is not the only factor. For example the size of the rain drop
itself had varying effects on degrading signal. Many also incorrectly
assume that MW gear does not create interference beyond 1 mile when the
range is only less than a mile. The reason the limit is less than 1 mile is
because that Rain has a HUGE effect on signal, and thats the range when rain
is present. But in dry clear weather the signal can easilly go 5 miles
(making a link) even considering oxygen absorbion. Thats why radios with
APC are advantageous as power is only as high as needed to get a good link
and counter act the absorbtion characteristics of the weather. (Of course
the narrow beams are often considered interference free). But this narrow
interference free beam is what makes it hard to stay aligned. Mounting a 13"
panel on a JRM (2-3/8" dia) mount, with the only antenna on it, is barely
stable enough for a short range link. We recommend 3" pole MINIMUM. And
keeping the 2ft parabolics stable are even tougher. Almost always best if
fastened tight to an IBEAM or Wall, apposed to a Mast or Cantilever.
So again, these units are VERY reliable, but you need to know what you are
doing as far as engineering them to be reliable.
Tom DeReggi
RapidDSL & Wireless, Inc
IntAirNet- Fixed Wireless Broadband
----- Original Message -----
From: "Jack Unger" <[EMAIL PROTECTED]>
To: "WISPA General List" <[email protected]>
Sent: Friday, August 10, 2007 2:54 PM
Subject: Re: [WISPA] FE60U Backhaul
Luke,
The unit itself is very reliable however if the link is mis-engineered or
mis-aligned then it will be unreliable. My guess is that the vendor
reporting the problem has either mis-engineered the link and is trying to
make it work over too long of a distance OR they installed the link
without a true line-of-sight path. Any obstruction between the two units
will prevent reliable operation. By "any" I mean anything with a physical
dimension to it - a pole, a tree, a paint bucket, etc.
jack
Luke Pack wrote:
We have decided to look into this particular BH. In doing so, there is
one of our vendors that are reporting problems with this unit in rain,
snow and fog. Most people I have talked with say that will NOT happen
and swear to their dependability. This may be more true given that our
link is less than 100yds away and on the roofs of two very high
buildings. So, without more chatting here's the questions:
1. what's everyone's opinion on this- any users of it that can tell me
those people having problems are aiming wrong or something?
2. What's your experience with it?
Regards,
Luke Pack
Wireless Administrator
Internet Services of Northern Illinois
(815) 380-3773 Ext. 286
[EMAIL PROTECTED]
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Jack Unger ([EMAIL PROTECTED]) - President, Ask-Wi.Com, Inc.
FCC License # PG-12-25133
Serving the Broadband Wireless Industry Since 1993
Author of the WISP Handbook - "Deploying License-Free Wireless WANs"
True Vendor-Neutral Wireless Consulting-Training-Troubleshooting
FCC Part 15 Certification for Manufacturers and Service Providers
Phone (VoIP Over Broadband Wireless) 818-227-4220 www.ask-wi.com
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