ISR 4451-x power supply 4500W holdup time

[Vitaliy Buchyn]

Hi, folks.

I'm experiencing an issue with an automatic transfer switch (AP7723) and the ISR 4451-X power supply.

When switch is transferring a power the ISR is falling to restart process (with no correlation if one or two power supply installed).

Recent specification for the ATS says that a maximum transfer time is 18ms, typical time 8-12ms

I couldn't find any reference for the holdup time for the power supply PWR-4450-AC, only those for the 4500 series (http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst4500/hardware/catalyst4500e/installation/guide/Eseries/0aspecs.html)

Please, advice

Thanks in advance,

Vitaliy

[Vitaliy Buchyn]

Hello all,

after a long investigation way, testing many UPS devices, taking a new power supply it seems that there is a hardware bug of 4500 series itself.

hope this will help someone.