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Joined: Jul 2004
Posts: 10,031 Likes: 37
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Maybe the world has changed but when I learned this stuff in the 90s, you didn't plug the head end in until you had a terminal on the other end with UTP. That was why IBM sold an STP solution. They don't sell much of it these days so maybe it was BS 
Greg Fretwell
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Joined: May 2005
Posts: 167
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Sounds like BS to me, or it could have only been applicable to Token-Ring (which practically nobody uses anymore). I have never used or worked with Token-Ring so I can't say for sure.
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Joined: Jul 2004
Posts: 10,031 Likes: 37
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Token ring, at least in the IBM implementation, used a shorting type plug and receptacle that closed the ring when it was unplugged.
I tend to agree a UTP in a punched down keystone is safe but just having the bare wires swinging in the air still sounds like it is open to causing problems.
Greg Fretwell
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Joined: May 2005
Posts: 167
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There was a way to run Token Ring over UTP, I believe you used adapters called media filters to do it.
Bare wires swinging in the air could be a problem..why I suggested taping them off.
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Joined: Mar 2007
Posts: 404
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Not sure about sending Token Ring over UTP, but we did the opposite in the old building (temp solution before it was torn down and rebuilt), using the old Token Ring wiring and a homemade adapter to connect computers to an Ethernet network.
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Joined: Jul 2004
Posts: 10,031 Likes: 37
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State Farm ran T/R on Cat5. Yes they do call that balun a media filter.
Greg Fretwell
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Joined: Aug 2009
Posts: 22
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It might be useful to check and see if they run Power Over Ethernet.
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Joined: Aug 2007
Posts: 61
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Just make sure you CYA, because some of the switches in the server room could be upwards of $40k to $60k And like others have said, watch out for PoE
~Matt
I would rather beg for forgiveness then beg for permission.
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Joined: Mar 2004
Posts: 251
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Most switches will isolate any shorted or open lines, even PoE switches a current limited and will isolate a shorted line. Some of the older Hubs did not like shorts and would slow down the other ports. I always contact IT before doing anything with their stuff. Although I have IT certification, most IT guys are real protective of there territory and will blame any one else on any failures their system has. Robert
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Joined: May 2010
Posts: 6
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Since I'm one of those 'geeks' (actually a network analyst in a large health authority) and there doesn't seem to be a great respect for my type here, I'll keep this short. If you absolutely KNOW it's a (non-powered) hub and you know the difference, you're probably just fine. However, if any of those wires is connected to a switch or router, especially one that provides PoE (power over ethernet), you could cause all kinds of trouble. We get automated alerts every time someone does something that "shouldn't be a problem" with our network....  BTW, check out the replacement prices for a new Cisco PoE switch sometime. If that doesn't make you careful, nothing will!
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Posts: 30
Joined: January 2013
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