Something I could hang on a tower next to a radio would be ideal.
Seems like your case has tabs on top and bottom for band clamps,
doesn't it?
Craig
Quoting Chuck McCown <ch...@wbmfg.com>:
Not yet...
What form factor would be preferred?
I could fit it in my regular surge suppressor case if that is not too small.
-----Original Message----- From: Craig Baird
Sent: Tuesday, December 01, 2015 3:07 PM
To: af@afmug.com
Subject: Re: [AFMUG] POE vs DC and surge supression
You don't have an outdoor version, do you?
Craig
Quoting Chuck McCown <ch...@wbmfg.com>:
I am kinda partial to this one:
http://www.mccowntech.com/dc-power-line-apc-rack-surge-suppressor-protector/
From: Josh Baird
Sent: Tuesday, December 01, 2015 2:33 PM
To: af@afmug.com
Subject: Re: [AFMUG] POE vs DC and surge supression
Not to go too far off track here, but what DC surge protectors have
you used? I priced ones from Calix and they were sort of pricey
(>100 each).
Josh
On Tue, Dec 1, 2015 at 4:29 PM, Ken Hohhof <af...@kwisp.com> wrote:
I can't speak to R56, but the only experience I have with 48V
direct DC power is with a WiMAX basestation that the manufacturer
claimed the field failures were reduced to almost zero when they
started recommending a DC surge protector at the basestation. My
personal view is the one by the BS or AP (and it should be right
next to it) is more important than one on the ground. In our case,
if a surge tried to blow out our rectifiers and battery, it would
probably just pop a fuse. Even so, replacing some 48V DC equipment
on the ground is no big deal compared to replacing an expensive
basestation up on a tower.
-----Original Message----- From: Craig Baird
Sent: Tuesday, December 01, 2015 3:11 PM
To: af@afmug.com
Subject: [AFMUG] POE vs DC and surge supression
We've got some Cambium PTP820S radios going up shortly. We will be
running fiber to the radios, so we're debating on POE vs. DC up the
tower for powering them. We have been told by the tower owner that we
need to adhere to R56 for lightning protection.
Our initial thought was that we would just run POE since we already
have the cable, and it would give us an out-of-band management port.
But, according to the Cambium installation manual (and I think R56
specifies this too), it says that if we're running POE, we're supposed
to bond the cable shield to the tower every 50 meters. I assume that
means at the top and bottom since our cable runs are all less than 50
meters. In addition, the manual says that we should use Ethernet surge
suppressors. We're thinking "what a pain in the butt". On the other
hand, the Cambium manual does not address grounding for DC cable in
any way other than saying that the radio has DC (and Ethernet) surge
protection built in.
So the DC option is looking pretty attractive compared to the hoops
we'll need jump through for ethernet. I'm wondering if there's
something we're missing that the Cambium manual doesn't address. I
figured just to be safe, we would go ahead and put DC surge
suppressors at the top and bottom of the DC cable. Is there anything
else needed for R56 adherence in this situation?
Craig
