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9509 and Power supply

We are currently in the process of getting a 9509. My question is on the power supplies. If we have redundant 2500w PS and one fails, Is it true that if we use 110 v it won't power the the chassis fully populated. Do we need 220v for redundancy.

2 REPLIES
Cisco Employee

Re: 9509 and Power supply

When a 2500w PS is connected to 110v, it only delivers 1300w. A single PS will not be able to power a fully populated chassis. You need 220V input if you power consumption exceeds the 1300w delivered by the power supply.

This document covers this topic:

http://www.cisco.com/en/US/partner/products/hw/ps4159/ps4358/products_installation_guide_chapter09186a00801814f7.html#1023628

Cisco Employee

Re: 9509 and Power supply

At 110V the 2500w power supply provides only about 1200w and 2500 at 220V. The power consumption of your chassis will depend on the number and type of linecards that you put into it. A supervisor engine and the 16-port card will use around 220 watts, the 32-port cards will use around 200 watts and the 8-port IP blade around 105 watts. So worst case you could use only 16 port cards and two sups and you will end up with 9 x 220 = 1980 watts for the chassis (plus another 220 for the fan tray).

You could use two 2500 watt (at 110v) supplies in that scenario in non-redundant mode (using combined capacity of both power supplies) but you will lose redundancy in case of failure.

My recommendation would be to spend money on the 4000w supplies - that way you are prepared for all scenarios and all future linecards that we may come up with :-)

Ralf

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