How to find out that the main PSU failed

How to remotely determine that the main PSU broke down or failed to plan for the elimination of this problem?

For example, the Zyxel XGS4600 series comes with two PSUs.

Answer

The PSU status can be monitored using the Zynos V4.60 or above. You can use the following ways to monitor the PSU status:

• Web GUI
• CLI
• SNMP 

The XGS4600 Series uses redundant PSUs; however, which is different from the 3700 series switches, they do not support hot swap and therefore are not initially monitored. But you still can use the above ways to monitor the PSU status.