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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