flummoxe Posted April 7, 2017 Share Posted April 7, 2017 Hi, Like many I have a plethora of cables at the back of my rack, which then have to be routed to power sockets, switches etc etc. As it's impractical if not impossible to keep the cables apart in a domestic environment, is using well screened power cables such as Supra LowRad or similar, and Cat7 ethernet cables which are also screened enough to avoid issues? I would very much appreciate views on the best way to deal with the issue. Thanks Paul Innuos Zenith SE (Roon Core) > Curious USB/Upton ISO REGEN +LPS-1/USPCB> Chord Hugo TT > ATC SCM 40A Link to comment
One and a half Posted April 7, 2017 Share Posted April 7, 2017 Screened power cables are good, the Lo-RAD works as they claim, there's no field around the cable. As for sound, the Lo-RAD is bettered, perhaps another thread. Ethernet is a different story. This is best UTP, whatever category you like. The reason is the shield carries leakage currents form source to destination, UTP doesn't since there's no screen. Leakage currents are hopefully strangled by differential transmissions, transformers and the like in NIC. AS Profile Equipment List Say NO to MQA Link to comment
Speedskater Posted April 7, 2017 Share Posted April 7, 2017 It's hard to imanage power lines interfering with ethernet! Have you done any data error testing? Link to comment
flummoxe Posted April 7, 2017 Author Share Posted April 7, 2017 I'm no expert but a power cable will generate a magnetic field around it which i'm concerned will interfere with the ethernet cable. I understand the advice is to keep data cable away from power but I can't achieve that hence the question about both being shielded. Innuos Zenith SE (Roon Core) > Curious USB/Upton ISO REGEN +LPS-1/USPCB> Chord Hugo TT > ATC SCM 40A Link to comment
mansr Posted April 7, 2017 Share Posted April 7, 2017 1 hour ago, flummoxe said: I'm no expert but a power cable will generate a magnetic field around it which i'm concerned will interfere with the ethernet cable. That's not a problem. Firstly, Ethernet is differential so anything picked up by the cable is cancelled out. Secondly, any power line noise is filtered out by the coupling transformer. Link to comment
flummoxe Posted April 7, 2017 Author Share Posted April 7, 2017 OK thanks for that. So why is the advice to keep power and date cables away from each other as per the below? "Current standards clearly define the separation between power and data cables. For instance, the minimum separation distance between unscreened power and unscreened UTP cable is 200 mm. This is reduced to 50 mm for screened data cable and to just 30 mm if the power cable is screened. Electro-magnetic interference from power cables can reduce the performance of data cables, particularly speed of data transmission" http://www.modbs.co.uk/news/fullstory.php/aid/1654/The_wired_answer_for_power___and_data_cabling.html Innuos Zenith SE (Roon Core) > Curious USB/Upton ISO REGEN +LPS-1/USPCB> Chord Hugo TT > ATC SCM 40A Link to comment
Speedskater Posted April 7, 2017 Share Posted April 7, 2017 That industrial paper is about very long cable runs and the separation is still only 8 inches. And some of those industrial AC power cables may generate nasty interference. Link to comment
mansr Posted April 7, 2017 Share Posted April 7, 2017 15 minutes ago, flummoxe said: OK thanks for that. So why is the advice to keep power and date cables away from each other as per the below? "Current standards clearly define the separation between power and data cables. For instance, the minimum separation distance between unscreened power and unscreened UTP cable is 200 mm. This is reduced to 50 mm for screened data cable and to just 30 mm if the power cable is screened. Electro-magnetic interference from power cables can reduce the performance of data cables, particularly speed of data transmission" http://www.modbs.co.uk/news/fullstory.php/aid/1654/The_wired_answer_for_power___and_data_cabling.html That's about large installations with cable runs potentially reaching the 100 m limit of Ethernet. The margins are obviously much smaller in such conditions, so a little separation is probably a good idea. It's also very expensive to redo the cabling should there be a problem. In a domestic setting, cables are rarely in close proximity for more than a few feet. Link to comment
flummoxe Posted April 7, 2017 Author Share Posted April 7, 2017 Thanks both mansr and speedskater for your help. Much appreciated Innuos Zenith SE (Roon Core) > Curious USB/Upton ISO REGEN +LPS-1/USPCB> Chord Hugo TT > ATC SCM 40A Link to comment
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