I am using a DC to DC converter with each of my WRAPs so they are
powered with the Lucent standard 48V POE. The D-Link 5V/12V switchable
POE units work fine for this.
I use flooded, shielded, with drain wire, outdoor CAT5 cable. (about
$75 for 1000ft) I tie the drain wire to the coax and WRAP board ground
topside. I ground the coax to the tower/antenna mount. Ground the
drain wire at the power injector.
Since doing this, I have had NO WRAP failures, and no spike induced
lockups that require a power off/on cycle.
Using this in other locations, (non WRAP) seems to have eliminated the
need for POE/ethernet surge protectors..
We have had several major thunderstorm systems go thru since then. I
have not lost any equipment at locations I have done this at. We used
to loose a WRAP or 2 with each major storm front.
Note that shielded CAT5 doesn't seem to be good enough. The drain wire
seems to be required.
Blair
Tom DeReggi wrote:
What are people doing for WRAP board lightning protection?
Basically the WRAP board has a part that blows up, if it receives more
than 21 Volts to its DC input.
So a typical CAT5 Lightning protector that protects the DC pairs at
only 35V, 50V or 60V would pretty much be useless for protecting the
WRAP over the DC lines.
Any Protectors on the market that start to clamp at 20V DC? I'm
guessing most people are just going without lightning protections, and
settling for UPS protection on the AC line?
What about the COAX/antenna side? If installing the WRAP radio up on a
tower, with an external antenna with a 3 foot Caox cable to it, are
you guys, springing for the COAX lighting protector?
For a several 10 ft run down a tower, of course the COAX protection
should be used, but for a 3 ft run?
I like the WRAP boards, but the 21V max tolerance, I think could end
up being a major flaw for wide scale deployment.
What are others finding? I like the design of the Mikrotik 532's
better, but to standardize on it, I need to know that there is more
than one distributor/reseller of the product nationwide. Hopefully
the production will improve once the product becomes more mainstream.
Tom DeReggi
RapidDSL & Wireless, Inc
IntAirNet- Fixed Wireless Broadband
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