Each product has strength and weaknesses and what is best for a city
wisp probably won't cut it for some one in the boonies. We use to use
Trango but they moved there product closer to Moto and I for us that was
the wrong direction. We also have many hundred Wave rider customers and
even with some of its draw backs compared to newer products the software
is great compared to Trango, you can solve almost any issue from you
desktop where you need other tools or hardware to come close on a
Trango. The Alvarion products I have used are top notch but their
900mhz is lacking in many ways.
I would tend to side a bit with Patrick on a brand name network having a
better resale value and potential as it is a know quantity where as a
Mikrotik networks quality is harder to value as it depends more on the
people who put it together. But just because your use M$ for your PC and
network does not mean you have a better network or desktop when compared
to Linux. It's just different. Mikrotik is not just about 802.11a/b/g
which in most cases I try and avoid. They to have a proprietary
protocol too that employs polling for P2MP and does away with may of the
a/b/g issues.
With Mikrotik you are not dependent on a single vendor and their stock
issues, you can in most cases work around them. Think of it this way
too. No multi thousand dollar spares sitting on a self getting dusty.
If my main back haul, AP, Hotspot, etc. takes a lighting hit, I can
convert my own client radio into a back haul or what ever and tune it to
any frequency from 4.9ghz to 6ghz or just even grab an old 486 and a
wireless nic from a local store and your up in only an hour or so longer
then it takes to drive to the site. Due to the frequency rang available
you also do not have to stock a selection of multi hundred dollar CPE's
or multi thousand dollar APs' to cover different bands. About the only
disadvantage I see in this is that I'm guessing that products like
Alvarion MAY perform better in noisy environments as the frequency
restriction on these products should in theory provide better
selectivity then mPCI based cards... It would be interesting to test
some things like adjacent channel rejection and other stuff that is
never spec'ed by the vendors.
Erik
John Scrivner wrote:
I have only seen this type of interference three times. Twice with
Etherants and once with a Trango FOX. I have heard of other gear
having similar issues from other WISPs. It usually effects
over-the-air television or two-way radio communications located on the
same tower as the data radio. I have heard of this type of
interference a few times in regard to the RB532. I do not know if this
particular board has a higher degree of this interference or if it is
just a popular radio which has been identified to have similar issues.
I do not have any RB532s in the field so I cannot speak to this one
way or another for that particular product. I am guessing that some
manufacturers have identified and resolved these issues prior to
product release while others have not. From what I hear about the
RB532 this is still an ongoing issue. I am also guessing that ferrite
beads will at least diminish the level of noise for those who are
dealing with this.
Scriv
Patrick Leary wrote:
Very cool troubleshooting trick, but I've never heard of the problem. Is
that wide spread John?
Patrick Leary
AVP WISP Markets
Alvarion, Inc.
o: 650.314.2628
c: 760.580.0080
Vonage: 650.641.1243
[EMAIL PROTECTED]
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On
Behalf Of John Scrivner
Sent: Saturday, December 02, 2006 8:50 AM
To: WISPA General List
Subject: Re: [WISPA] 900 Mhz Mikrotik SR9 Clients
Many outside radios suffer from RF radiation over the Ethernet. I
have personally seen this on the YDI Etherant and the Trango FOX.
This problem is not specific to any one manufacturer. The cable acts
as a transmit antenna, carrying the clock signals from internally to
the outside. This can be largely corrected with the use of ferrite
beads at the radio and POE injector on these radios. This is a low
cost fix in many cases and I have personally seen a 16 db improvement
in noise elimination using this approach. Just Google "ferrite beads"
and I am sure you will find suppliers. I do not remember where we got
ours but they were very inexpensive. I think we paid less than a
dollar a piece for these. They are literally a snap to install. They
snap together over
the Ethernet wire. It takes seconds to install.
Scriv
Rick Smith wrote:
I had the same problem with some canopy access points - had to do with
Ethernet.
I put an AP up on a tower, and it interfered with a HAM radio guy.
Once I
moved it down on the tower 20 feet, the problem went away. I put a 532
right next to that HAM'r and nothing happened, I've got a nice 5.8 gig
feed
and a 2.4 repeater there now...
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On
Behalf Of Travis Johnson
Sent: Saturday, December 02, 2006 10:30 AM
To: WISPA General List
Subject: Re: [WISPA] 900 Mhz Mikrotik SR9 Clients
There is a HUGE problem with Mikrotik and FCC certification. The
Mikrotik
532 puts out over 30db of constant "noise" in an area they should not
be
(150MHz and 400MHz). It's still an issue, and has not been fixed or
even
addressed by MT.
Travis
Microserv
Butch Evans wrote:
On Fri, 1 Dec 2006, Patrick Leary wrote:
Why do you have to have the router? The DSL and cable guys don't
provide routers (not without extra fees). I provide my own in my
home. At work we have our own router.
I provide a router because that is the best network design and it
offers ME an upgrade path that is beyond just being a provider of a
COMMODITY service (transport). You don't have to agree with it,
others don't have to do it, but "them's the facts".
VL also can do VLAN, all the way to QinQ 802.3ad VLANs. It does
<SNIPPED LOTA OF "NON MARKETING GOOP">
that's not marketing goop, it's been tested by a tier 1 operator
and it blew them away.)
Wow. As I said in the first post, I have nothing bad to say about
Alvarion gear...(please read the last paragraph)
Plus, in the end the thing that I admit really gets me is that
some of these products simply are not legal at all and are
illegally shipped in from overseas. If we just blatantly flauted
the laws we could save tons in R&D and legal too. It has always
been disappointing that some WISPs simply don't care about that.
Especially when at the same time the same WISP might complain that
another WISP is over driving a system.
This is a problem, but not so much of a problem as you make it out
to be. I realize the law is "black and white", but the reality is
a little more like "shades of grey". I'm not supporting anyone
breaking
the law, but the truth of the matter is that there IS a difference
between operating a system that is not certified within legal
limits and operating a system that operates outside legal power
limits. The primary difference is that one of these (you get to
pick) will cause more harm to the usability of the spectrum than
the other.
On another subject, take another look at the subject line...It's
not about Alvarion gear, but you seem to have stepped into the
middle of it (once again). I really just wish you'd at least have
the courtesy to change the subject line if you are going to change
the subject.
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