There are 25 pairs of wires in a 25 pair cable. You only need 2 pair per run for standard ethernet (1,2,3 & 5 in a standard RJ45) So that gives you 12 connections between top and bottom. For power, use a separate power run to the cabinet (speaker wire!... just kidding!)
There you have it. ryan Brad Belton 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! 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! 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! 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! 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! 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! 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/
