Cisco ASR 920: A router with a fear of heights?

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:

  1. How did Cisco learn of the PSU problem? Device failure, or DC fire?
  2. How many other models have the wrong PSU?


Cisco ASR 920
Various Configurations 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

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