Hi,
In our small office network, we have about 12 different computers spread over 4 circuit breakers. Most of the computers are protected by UPS systems. However, many LAN switches are not.We leave our computers on 24 hours.
We had a wierd problem late in the night.
- Two computers reset themselves even though they were on UPS. Both these computers are on two different circuit breaker.
- All our main servers are on one circuit breaker and are powered by a high capacity UPS system. Although these servers did not go down, the UPS reported a short duration "undervoltage" condition.
One of the resetted computer was on UPS. Therefore, it was not the electrical power that caused the reset. The only other input to the computer is the ethernet cable. Here is the layout:
Computer -> Ethernet Cable --> Switch1 --> Switch2 --> Switch3
The computer, Switch1 and Switch3 were powered by UPS. However, Switch2 was not.
Questions:
- What causes undervoltage? Looks like it is not isolated to a single circuit breaker.
- Can undervoltage result in a power problem on the ethernet cable that in turn will reset the computer?
Thank you in advance for your help.
Regards, Pete