Dana.Repouille wrote:Our stake center was wired with Cat6 cable for all telephones. Our FM guy tried to use the extra pairs to piggyback Ethernet on those cables, but it just never worked right. In the end, he had to pull two cables through the conduit. I think part of his problem was that he was untwisting the pairs too far away from the connectors.
I find when multiple LAN100Mbit/s or LAN100Mbit/s with a Phone are in the same cable bundle and one of the LAN100Mbit/s just never worked right it was usually the pair colors on the non working LAN were mixed-up or the send/receive pairs where reversed in a crossover, it is an easy error for me trying to keep in mind which color matches up with which color at the terminations. When I have a LAN100Mbit/s with a Phone in the same bundle to Keep Pairs Organized I use the ring pairs orange and green for the LAN100Mbit/s (It is easier for me to keep the LAN pairs organized when the colors are the recognized orange and green) and the ring pairs blue, brown or grey for the phone. Phone pairs are easier to connect because standard use phones now manufactured if in connection error the Tip and Ring is reversed the dial out still functions. Yes, the best option is to have two cable bundles. However if this is not a cost effective or practical option in older buildings or older CMU buildings I would look into the function of using the simplest current install before more drastic installs are pursued.
Keeping the pairs twisted close to the connectors is critical for 1000Mbit/s certified terminations, not so much for 100Mbit/s, 10Mbit/s terminations. An interesting observation I made on twisted pairs was over 20 years ago, as I would ride in a car along a Rail Road I would notice a pair of parallel wires running from pole to pole, every few poles the wires would cross over top of each other, I did not know why at the time. When I was serving a mission in Mexico I met a American who is a retired electrician from the Rail Road and I asked him about my observation about the pair of parallel wires that would cross over top of each other at the poles and he told me, "They are a twisted pair for data/communication, the wire pair does a twist at the poles".