Hi all
I've just got a new house and am about to run a couple of Cat5e cables to connect the main computers in the house.
I have been given a box of Cat5e FTP cable which is shielded and a few non-shielded faceplates.
I have read you have to use the shielded cable with shielded face pates. Is this true and would it matter if I used it with "normal" faceplates???
Thanks
I diont thiunk it really matters that much.
Just ground the shield to local mains earth, and pretend its unshielded.
Should be fine up to 100mbps.
No, that'll just bring all the muck and s*it on the mains earth into close proximity to your data circuits...
I can't decide what the implications, safety, earth loops etc, are of connecting the shield to mains earth are either.
In article , Dave Liquorice scribeth thus
CAT 5 being a "balanced" type of operation us very robust indeed.
It will make sod all difference in that application anyway but if you must earth the shield and do it at one end only....
I'm well aware of how well good balanced circuits can reject noise, use 'em all the time for running signals at around -50dBu for 500m or more. But there is no point in increasing the common mode interference for no reason....
Which end? Worms, can for the opening of. B-)
Doesn't really matter, just as long as you don't introduce an earth loop
You are assuming that a bunch of shield flapping in the breeze will pick up less crap than if tied to mains earth. My experience suggest that the reverse is the case.
Its an RF shield mainly. Earth it all over the place, The odd bit of hum loop makes piss all difference to Ethernet speeds.
Doesn't matter if you do either.
Unless you want to shove microphone level signals at audio frequencies down it.
DC earth one end, RF earth the other? Its probably OK with an RF earth at each end. Use a 3000V capacitor to match the 3000V isolating transformer or spikes will break things sooner. BTW AFAIK cat5e is unscreened and its not cat5e if it has a screen.
No, you can get UTP (Unshielded Twisted Pair) and FTP (Foiled Twisted Pair) Cat5e cable:
What's it 5 volts peak to peak?..
Well someone reckoned that this can induce more noise then it prevents and someone else claimed that it was better from an RF POV to earth to true earth at both ends...
We've got a lot of it in very RF noisy environments and never a problem:)..
Yup RF rules are bond it everywhere. Audio rules are bond it one place only.
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