I would second the hybrid fiber. Worked great for us and Best-Tronics is great. A little longer lead time but good to work with. For about the same as good CAT5 outdoor they will make you a 4 fiber and 2 conductor cable. We had a lot less issues using DC surge arrestors than POE.
On Tue, Dec 1, 2015 at 3:58 PM, Craig Baird <cr...@xpressweb.com> wrote: > 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 >>> >>> >>> >>> >> > > > -- Lewis Bergman 325-439-0533 Cell
