Those are very good features and have been around a while now but we
still ended up ebaying all of our 900 gear. I think the fact that they
still use csma/cd and don't include GPS support w/ every product line is
what has stopped them from having that killer product...
Tom DeReggi wrote:
I'm going to save my 4.0 Firmware evaluation results for later, after
I'm finished testing.
But while working with ED Wyatt this past week, (ps. thanks Ed for the
time), It reminded of some of the cool features that had existed in
the Firmware (supported on V3 also)
One that sticks out is the way that they do Automatic Transmit Power
Control. Of course this feature is needed to prevent unnecessary
interference including at the Cell Site, by allowing CPE radios to
just use the minimum Transmit power required to get a reliable full
speed link. Some competitors use ATPC, but it only considers the
desired RSSI that is targeted, not necessarilly link quality.
Alvarion's method I felt was engenius. It uses Signal to Noise Ratio
as the criteria for adjusting the Transmit Power at CPE. This
prevents the Power level from staying lower, if the noise level rises
after it is installed. It also was very customizable, with 4 filed
values that could be changes to fine tune how you specifically wanted
the ATPC to work. (for example, considering entended modulation,),
and even had an auotmatic override to gain link association, in case a
setting was made that would otherwise prevent good link quality or
association. Also in the past, when to much noise was hit heavilly,
it would reboot (in case it was an AP lockup), but now it can be set
not to reboot if preferred. It now can actually send a trap, to notify
you when the reboot would have occured, so you realize that a link is
having an interference problem. The end result was, the way they did
it, translated to a ATPC feature that would be very advantageous to be
used, apposed to a feature that would be disabled.
ATPC may not be a feature that WISPs want, who's desire is to destroy
the airways. But its an important feature for encoraging
co-existinance, and for that matter, health of your own cellsite's
equipment co-location, and commend Alvarion for their accomplishment
in that feature.
This feature for other manufacturers may be a factor of which chipsets
they use and their ability to measure SNR.
The other thing that was pretty cool, was its famous abilty, to have
two seperate memory spaces for Firmware to reside.
We were able to have V3 on one image and V4 on the other Image, and
with a flick of a switch (command) jump between the firmwares, so that
I could test the performance at each of the Firmware versions. This
drastically sped up comparative testing time. But what it brings up,
is that if you try a new firmware in the field, its not a huge time
consuming process to switch back, if you need to see if the old was
corrects a newly developed process. When you have a few hundred
sites, I could see that being an advantage.
RapidDSL & Wireless, Inc
IntAirNet- Fixed Wireless Broadband
WISPA Wireless List: email@example.com