Re: Good UPS for network equip?
From: w_tom (w_tom1_at_hotmail.com)
Date: 07/20/04
- Next message: Greg: "Re: Converting something that runs on batteries..."
- Previous message: Charles Schuler: "Re: Good UPS for network equip?"
- In reply to:(deleted message) DaveC: "Good UPS for network equip?"
- Next in thread: DaveC: "Re: Good UPS for network equip?"
- Messages sorted by: [ date ] [ thread ]
Date: Tue, 20 Jul 2004 17:55:30 -0400
You are fooling yourself if you think a UPS will solve
networking problems. If AC electric is a reason for network
problems, then the solution begins by finding a defective
safety ground or eliminating the power supply that retail
lists for less than $50.
Solution to your network problem starts with running
comprehensive diagnostic. One had intermittent problems. Ran
the comprehensive diagnostic in the massive data exchange test
- usually the last and optional test. Eventually, a defective
NIC would lock out under this massive data transfer. Such
comprehensive diagnostics assume you have two NICs from the
same manufacturer.
Plug-in UPSes, such as the recommended Tripplite, connect
computer directly to AC mains when not in battery backup
mode. Where is the protection? Furthermore, these UPSes
typically output some of their dirtiest electricity when in
battery backup mode. If a network was suffering from line
noise, then power the computer from a UPS in battery backup
mode. The network would crash immediately. If not, then AC
mains noise is not a reason for network failure.
One example of a UPS under light load is demonstrated. When
in battery backup, the 120 VAC output is two 200 volt square
waves with a 270 volt spike between those square waves.
Dirtiest electricity is from that UPS in battery backup mode.
But not problematic to any properly constructed computer. If
that noise caused computer problems, then the computer
hardware was defective when purchased or assembled.
Find the problem rather than trying to cure a symptom. IOW
first identify the reason for a problem before speculating -
before 'fixing' everything.
Another 'suspect' is existing cables. Also execute those
diagnostics with computers connected together by a known good
cable, no router, and not using existing building cables.
Even an ethernet cable plug or mismatched cable pairs can be
reason for intermittent - which is why the loope (magnifying
lens) is important for visual inspection of each RJ-45
connector. Identify reason for problem before fixing
problem. Provided are tools to accomplish that. A UPS to fix
the problem means the computer has defective hardware. Don't
cure defective computer hardware with a UPS.
DaveC wrote:
> Have one client that keeps having network lock up. Have replaced
> the router, but this doesn't help. Happens every 2 weeks, or so.
>
> There's so many UPS's on the market, I want to weed out the bad ones.
>
> What's your experience re. reliable and trash makes and models?
- Next message: Greg: "Re: Converting something that runs on batteries..."
- Previous message: Charles Schuler: "Re: Good UPS for network equip?"
- In reply to:(deleted message) DaveC: "Good UPS for network equip?"
- Next in thread: DaveC: "Re: Good UPS for network equip?"
- Messages sorted by: [ date ] [ thread ]
Relevant Pages
|
|
