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Joined: May 2007
Posts: 5,058 Likes: 5
Moderator-1A2, Cabling
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Moderator-1A2, Cabling
Joined: May 2007
Posts: 5,058 Likes: 5 |
When the reference is -48volts or even 24 volts or possibly even 10 volts you're usually OK.
Arthur, you're not forgetting about the infamous "Remote Hold" are you?
I had a service call several years ago out on Long Island. Main Data Closet in one building on a campus and an IC in another building that probably wasn't 1,000' away. Users connected to equipment in the MC could sign on to any computer connected to the MC, but NOT to any computer or server in the IC. And vice versa.
The answer was the grounds. Each closet had their own ground bar and they were not common. Each of the closets were fed from a different electrical service. There was a 3 or 4 volt difference in potential between the 2 grounds. With a 5 volt power supply it was enough to cause headaches.
Sam
Last edited by Silversam; 05/19/17 01:53 PM.
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