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.

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

-----Original Message-----
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.

Rick Smith wrote:

I had the same problem with some canopy access points - had to do with

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
and a 2.4 repeater there now...

-----Original Message-----
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
532 puts out over 30db of constant "noise" in an area they should not
(150MHz and 400MHz). It's still an issue, and has not been fixed or
addressed by MT.


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
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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