Secondary power supply Cisco 2921, 3925

[sergeymolchanov]

Hello!

I have two routers: Cisco 2921 and Cisco 3925. I want add secondary power supplies to it.

What models of power supplies I must choose?

Power supplies, that already installed in routers:

2921: PWR-2921-51-AC

3925: PWR-3900-AC

If I understand routers guide correctly, I can add to 3925 same power supply PWR-3900-AC, but 2921 support only RPS system, not secondary power supply.

[chrihussey · Accepted solution]

Yes you are correct. The 3925 is pretty cut and dry.

Below are links for the RPS as that is a bit more involved. Apparently you need an adapter for the 2921 (RPS-ADPTR-2921-51) and get the correct cable for the connection to the RPS 2300.

http://www.cisco.com/c/en/us/td/docs/routers/access/2900/hardware/installation/guide/Hardware_Installation_Guide/Overview.html#pgfId-1192360

http://www.cisco.com/c/en/us/products/collateral/routers/1900-series-integrated-services-routers-isr/ordering_guide_c07_557736.html#_Toc422864894

http://www.cisco.com/c/en/us/products/collateral/switches/redundant-power-system-2300/product_data_sheet0900aecd805bbef6.html

Regards