We have an HP 5412zl switch full of giagbit PoE+ ports. We have two 1500w power supplies in it running on large UPSs. Ever since installation 6 years ago, whenever the power hiccups or lights flicker, the switch reboots. Running diagnostics through the CLI always shows that we have insufficient power to the modules. Our VOIP system is pretty tasking but we arent anywhere near the max power the backplane is capable of providing. I was putting together a proposal for an external procurve cabinet with failover power supplies in it. While pulling/referencing part numbers for power supplies, I discovered that the power supplies in our blackplane are 220v units.... but they are plugged into 110v outlets in our UPS. We specified our requirements to the vendor and used the heavy power cables that shipped with the switch which plugged into 110 just fine. Nothing odd looking at all.
Apparently there is a power supply (J8713A) that only runs at 220v. They do have a switching model but it only provides 300w for PoE+. I specified double that output. That explains why I got the PS's I have. They provide 900. The sales rep screwed up and ive never seen a 220v plug that looked like a normal 110.
Props to HP for building hardware like that that can run in a production environment for 6 years at 1/2 its required voltage every day without problems (other than power bumps)
Ill be calling the electrician tomorrow.
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