No, I don't have the fiber yet. That's a great suggestion. Thanks!
Craig
Quoting Josh Baird <joshba...@gmail.com>:
Do you already have the fiber? If not, you should consider a hybrid cable
that has a few strands of fiber and 2-conductor 12/14AWG for powering the
radios? Best-Tronics is a good vendor for this cable.
On Tue, Dec 1, 2015 at 4:11 PM, Craig Baird <cr...@xpressweb.com> wrote:
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
