Number of C3K-PWR-750WAC in PWR-RPS2300 for router CISCO2921-HSEC+/K9

[boris.majstorovic]

Hi all

Does anyone can tell me, how many C3K-PWR-750WAC units in PWR-RPS2300 do I need for router CISCO2921-HSEC+/K9?

Thanks

[Reza Sharifi]

Hi,

The router by default comes with one power supply.  If you need a second one, you can use one 2300 to provide power redundancy.

Have a look at table-2 in the data sheet:

The Cisco 2911, 2921, and 2951 allow for power redundancy through the use of an external RPS device, thereby decreasing network downtime and protecting the network from power-supply failures.

• Redundant power on the Cisco 2900 Series is supported through the Cisco RPS 2300 Redundant Power System. You can use the Cisco RPS 2300 to provide redundant power for Cisco 2900 Series ISRs as well as Cisco Catalyst® switches.

• In order to use the Cisco RPS 2300, an external RPS adapter is required (configurable option) to connect the platform to the external RPS.

http://www.cisco.com/en/US/prod/collateral/routers/ps10537/data_sheet_c78_553896.html

[boris.majstorovic]

Thanks for your quick reply

I know that, my question is

Do I need two C3K-PWR-750WAC in PRS 2300 for 2921 router to work.

I have fond this table but can not understand it.

Table 5-3 RPS 2300 Backup Capabilities

Power Mode	Quantity and Type of RPS 2300 FRU
	Quantity 1 C3K-PWR-750WAC	Quantity 2 C3K-PWR-750WAC	Quantity 1 C3K-PWR-1150WAC	Quantity 2 C3K-PWR-1150WAC
2911 in RPS	1	2	1	2
2921, 2951 in RPS	0	1	0	1
2911 in POE Boost	0	1	1	2
2921, 2951 in POE Boost	0	1	0	1

Table 5-3 shows RPS 2300 backup capabilities when coupled with Cisco 2900 series ISRs.

[Reza Sharifi · Accepted solution]

According to this table with 1RPS, you need 2 C3K-PWR-750WAC for 2921-2951