Connectronics 82-8694, contact DoubleRadius or Winncom. I got that as part of a Purewave order. It’s pretty beefy and I think it was around $100. It does have its own NEMA box similar to the Cambium PTP series LPU, with a light you can see from the outside, and screw terminal blocks inside.
I think chuck McCown has one for the APC chassis now. From: Josh Baird Sent: Tuesday, December 01, 2015 3:33 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