AJJewsbury:Could it be that the monitors on the affected ring are on a different phase to the main computer in the server room?
It's not usual to have monitor leads going all the way back to the server room these days - normally the monitors on a desk are connected to a desktop PC or laptop on the same desk and then the connection to the server is via some network system - e.g. Ethernet. At least that's my assumption - so please someone shout if this one is different.
Modern networking systems (e.g. twisted pair Ethernet) have balanced signalling so are pretty immune to differences in Earth potential between the ends.
In the old days there might be terminals on the desk with RS-232 going back to the server room - which could occasionally be a challenge as RS-232 used Earth as a signal reference.
Things on different phases usually isn't a worry - since all the equipment runs on d.c. internally. In fact it's perfectly normal to have a 3-phase supply to a server rack with adjacent equipment or even the two power supplies of a single item of equipment fed from different phases. Some even have twin supplies (for redundancy) with at least one fed by a UPS which can sometimes be entirely out of phase with the mains supply - so you can in effect have six different 'phases' all jostling around in the same area - all perfectly normal.
- Andy.
Morning,
Yes, you are correct, this is just a standard modern day set up with monitor leads plugged in to local PC's under the desks.
Dave
AJJewsbury:Could it be that the monitors on the affected ring are on a different phase to the main computer in the server room?
It's not usual to have monitor leads going all the way back to the server room these days - normally the monitors on a desk are connected to a desktop PC or laptop on the same desk and then the connection to the server is via some network system - e.g. Ethernet. At least that's my assumption - so please someone shout if this one is different.
Modern networking systems (e.g. twisted pair Ethernet) have balanced signalling so are pretty immune to differences in Earth potential between the ends.
In the old days there might be terminals on the desk with RS-232 going back to the server room - which could occasionally be a challenge as RS-232 used Earth as a signal reference.
Things on different phases usually isn't a worry - since all the equipment runs on d.c. internally. In fact it's perfectly normal to have a 3-phase supply to a server rack with adjacent equipment or even the two power supplies of a single item of equipment fed from different phases. Some even have twin supplies (for redundancy) with at least one fed by a UPS which can sometimes be entirely out of phase with the mains supply - so you can in effect have six different 'phases' all jostling around in the same area - all perfectly normal.
- Andy.
Morning,
Yes, you are correct, this is just a standard modern day set up with monitor leads plugged in to local PC's under the desks.
Dave
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