TheRegister has an article about a Cisco recall on the ASR 920 Series Aggregation Services Routers PSUs
I enjoy reading TheRegister, but this article is a little light on research.
Looking around online, it turns out that PSUs are often designed for certain altitudes when using air as a dielectric and for cooling, and 2,000 meters is common. However, the current ASR 920 datasheet specifies 4,000 meters, hence the recall.
The real story is:
- How did Cisco learn of the PSU problem? Device failure, or DC fire?
- How many other models have the wrong PSU?
Various Configuratins of the Cisco ASR 920
How Does Altitude Affect AC-DC Power Supplies?
theregister.co.uk: A router with a fear of heights? Yup. It’s a thing
cisco.com: Cisco ASR 920 Series Aggregation Services Routers: Low-Port-Density Models Data Sheet