Many manufacturers recommend surge protectors at both ends. It’s certainly possible, I have licensed gigabit POE radios with protectors top and bottom and no errors.
I’ve never seen how a surge protector at the bottom of the tower protects the radio at the top, seems like it protects the router/switch/POE. Not saying I love my Purewave system, but it has 48VDC on a separate pair of wires and they have you put DC protectors top and bottom. They told me field failures of basestations went way down with the addition of the DC protectors. And capacitance is no issue, you can put big old MOVs, gas tubes, diodes, whatever you want on there to absorb the surge. From: Mike Hammett Sent: Tuesday, February 03, 2015 7:04 AM To: af@afmug.com Subject: Re: [AFMUG] Survay Monkey Should UBNT Make a Radio With AFiber port? Easier to protect power alone than power + data. Usually I see the data going out anyway vs. the power side. I really did mean ESD as I separated ESD and lightning. Usually the manufacturer recommends only one additional surge suppression device as to data capacitance issues. That restriction goes away with separate power + data (over fiber). ----- Mike Hammett Intelligent Computing Solutions http://www.ics-il.com -------------------------------------------------------------------------------- From: "Ken Hohhof" <af...@kwisp.com> To: af@afmug.com Sent: Monday, February 2, 2015 10:48:29 PM Subject: Re: [AFMUG] Survay Monkey Should UBNT Make a Radio With AFiber port? Why do you say no more ESD issues? (I think you really mean lightning issues, I don’t buy this wind blowing across the plastic nonsense.) A lot of the time when radios get zapped, it’s the power circuitry that’s damaged. You are still powering the radio over copper. Until you figure out how to power it with light, you are vulnerable to surges. It helps a lot if you put a DC surge protector right at the radio, but how many people do? And as long as you have a coax jumper to the antenna, you are vulnerable to surges finding a path from the antenna to ground via the radio. Again, can be mitigated with a good coax surge protector, but how many people do that? Inside a POE fed radio, there should be transformers in the data path, it’s the power path that has DC continuity. The Ethernet transformers should provide quite a bit of resistance to surges due to primary/secondary isolation, possibly a ground foil between primary and secondary, plus differential surges should be attenuated by transformer core saturation. So the most vulnerable circuitry is the power path. Which still exists if you have DC power and data over fiber. From: Mike Hammett Sent: Monday, February 02, 2015 10:35 PM To: af@afmug.com Subject: Re: [AFMUG] Survay Monkey Should UBNT Make a Radio With AFiber port? No more ESD issues. No more lightning issues. No more RF issues. *EVERYTHING* on a tower should be fiber. ----- Mike Hammett Intelligent Computing Solutions http://www.ics-il.com -------------------------------------------------------------------------------- From: "Brett A Mansfield" <br...@silverlakeinternet.com> To: af@afmug.com Sent: Monday, February 2, 2015 9:54:16 PM Subject: Re: [AFMUG] Survay Monkey Should UBNT Make a Radio With A Fiber port? I personally wouldn't want to have to run fiber and power to the airFiber. One cable is already enough. There is really no reason for fiber on any of their products. With that said, it's pretty cheap to put the SFP on. There is also no reason they cannot put them both on at least the airFiber. Thank you, Brett A Mansfield On Feb 2, 2015, at 8:45 PM, Jason McKemie <j.mcke...@veloxinetbroadband.com> wrote: It cannot possibly cost very much - a $35 rb260gs has a sfp port... On Monday, February 2, 2015, Peter Kranz <pkr...@unwiredltd.com> wrote: I don’t think this passes the economic factors model for them.. I don’t think they would sell enough of them to make it worth the engineering, mold work, etc… Peter Kranz Founder/CEO - Unwired Ltd www.UnwiredLtd.com Desk: 510-868-1614 x100 Mobile: 510-207-0000 pkr...@unwiredltd.com From: Af [mailto:af-boun...@afmug.com] On Behalf Of timothy steele Sent: Monday, February 02, 2015 4:57 PM To: af@afmug.com Subject: [AFMUG] Survay Monkey Should UBNT Make a Radio With A Fiber port? posting this Survay on All the forums Want to see what you guys think Should UBNT Make A Radio with a Fiber Port? I Will Send the Graph to the UBNT Team https://www.surveymonkey.com/s/8SPM9NT Thanks!
