I guess the short answer, IMO and experience, is no. It's not as if we've just started doing this, but actually have years of experience with this type of very simple installation.
Do you now understand that all six radios are NOT powered off of a single pair? Each radio has all eight conductors available to it no different than running six cables for six radios. Best, Brad -----Original Message----- From: wireless-boun...@wispa.org [mailto:wireless-boun...@wispa.org] On Behalf Of Adam Goodman Sent: Tuesday, March 10, 2009 1:34 PM To: WISPA General List Subject: Re: [WISPA] Easy Ethernet up the tower Here is the original concern regarding the lightning strike jumping to other radios. ===== snip ==== Would this not increase the chances of a strike to a single AP jumping at the block to the other pairs? Dylan ===== snip ==== On Tue, Mar 10, 2009 at 2:28 PM, Brad Belton <b...@belwave.com> wrote: > I think you're making this more difficult than necessary. > > 25pr = 50 wires = 25 pair > > There are 8 wires in a standard CAT5 cable. > > 50 / 8 = 6.25 or more simply 48 / 8 = 6 > > Or as David illustrated there are four pairs in a standard CAT5 cable. So, > if you take 24 pairs from the 25 pair cable and divide by 4 you get 6 > giving > you 6 cables. > > Regarding lightning; we haven't seen any increase in lightning risk with > this type of installation and have several installed this way on a variety > of structures and elevations. If your site is grounded properly I don't > believe one cable is more susceptible to lightning strikes than six. > > Best, > > > Brad > > > > > > -----Original Message----- > From: wireless-boun...@wispa.org [mailto:wireless-boun...@wispa.org] On > Behalf Of Adam Goodman > Sent: Tuesday, March 10, 2009 1:15 PM > To: WISPA General List > Subject: Re: [WISPA] Easy Ethernet up the tower > > As Dylan mentioned, increased lightning damage could also be an issue with > a > single core cable. > > I run all my cables in a single bunch down the tower. They are individually > shielded. And all the shielding is connected to the same ground of course. > > Regardless, they would also get power from the same source. I could put > individual arrestors at the top of the tower. At the bottom I would have > one > for the AC and one for each Ethernet quad. > > > > > > On Tue, Mar 10, 2009 at 2:07 PM, Adam Goodman <a...@wispring.com> wrote: > > > OK. So would one use the 25th pair to power all the radios over a 150' > run? > > > > > > > > On Tue, Mar 10, 2009 at 2:00 PM, David <ad...@speedyquick.net> wrote: > > > >> 24/4 =6 > >> > >> > >> > -----Original Message----- > >> > From: wireless-boun...@wispa.org [mailto:wireless-boun...@wispa.org] > On > >> > Behalf Of Adam Goodman > >> > Sent: Tuesday, March 10, 2009 11:56 AM > >> > To: WISPA General List > >> > Subject: Re: [WISPA] Easy Ethernet up the tower > >> > > >> > 24 / 8 = 3... I guess you run the power up separately? and break it > out > >> > for > >> > the POE? > >> > > >> > > >> > > >> > > >> > > >> > On Tue, Mar 10, 2009 at 1:21 PM, Brad Belton <b...@belwave.com> > wrote: > >> > > >> > > A 25pr armored outdoor CAT5 cable is equivalent to running 6 > standard > >> > CAT5 > >> > > runs. > >> > > > >> > > Run the 25pr to a NEMA4 Hammond enclosure or equivalent and breakout > >> > the > >> > > cable into a patch panel or punch down block. From there then run > >> > > individual outdoor armored CAT5 to your equipment. > >> > > > >> > > Attached is a picture of an example from 2004 or 2005 of what I'm > >> > talking > >> > > about. Since this installation we've gone to a 12 port RJ45 > vertical > >> > panel > >> > > rather than the punch down block. Bottom side of the run is simply > >> > punched > >> > > down into a patch panel. > >> > > > >> > > This picture unfortunately shows an incorrect 25pr color code. For > >> > the > >> > > correct color code look here: > >> > > > >> > > http://en.wikipedia.org/wiki/25-pair_color_code > >> > > > >> > > Best, > >> > > > >> > > > >> > > Brad > >> > > > >> > > > >> > > -----Original Message----- > >> > > From: wireless-boun...@wispa.org [mailto:wireless-boun...@wispa.org > ] > >> > On > >> > > Behalf Of Adam Goodman > >> > > Sent: Tuesday, March 10, 2009 11:29 AM > >> > > To: WISPA General List > >> > > Subject: [WISPA] Easy Ethernet up the tower > >> > > > >> > > Hi guys, > >> > > > >> > > I am thinking of installing Ethernet junction boxes on my towers > (top > >> > and > >> > > bottom). The idea is to install a larger number of runs up the tower > >> > and > >> > > run > >> > > shorter runs from the box to the radios. The same at the bottom from > >> > the > >> > > patch panel to the equipment/arrestors etc. > >> > > > >> > > Is anyone doing this? What kink of (water proof) boxes do you use > and > >> > do > >> > > you > >> > > use a multiple CAT5 cables or do you run 48 or 96 pair? > >> > > > >> > > > >> > > > >> > > > --------------------------------------------------------------------- > >> > ------- > >> > > ---- > >> > > WISPA Wants You! Join today! > >> > > http://signup.wispa.org/ > >> > > > >> > > > --------------------------------------------------------------------- > >> > ------- > >> > > ---- > >> > > > >> > > WISPA Wireless List: wireless@wispa.org > >> > > > >> > > Subscribe/Unsubscribe: > >> > > http://lists.wispa.org/mailman/listinfo/wireless > >> > > > >> > > Archives: http://lists.wispa.org/pipermail/wireless/ > >> > > > >> > > > >> > > > >> > > > >> > > > --------------------------------------------------------------------- > >> > ----------- > >> > > WISPA Wants You! 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