It is not that simple it matter which pairs you use. If you just try matching wires or pairs at each end you will have problems. You need to punch it down according to the standard or you will not end up with 6 working Ethernet cables. For short runs you could probably get away with not following the standard but don't try it for long runs.
David > -----Original Message----- > From: wireless-boun...@wispa.org [mailto:wireless-boun...@wispa.org] On > Behalf Of D. Ryan Spott > Sent: Tuesday, March 10, 2009 12:34 PM > To: WISPA General List > Subject: Re: [WISPA] Easy Ethernet up the tower > > 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! 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