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Beginner

C Series ISR Router??

I am looking to upgrade a 2811 router to 15.1.2T and see in the release notes that this image is only compatible with  the "C Series" older ISR routers?  What is a "C Series" ISR and how do I know if I have one?

Any info would be appreciated.  Thanks.

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Hall of Fame Master

Would you paste in the entire context or post a link.

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Cisco Integrated Service Routers Generation 1 C-Series

Cisco IOS Release 15.1(2)T supports the Cisco 1841C, Cisco 2801C, Cisco 2811C, Cisco 2821C, Cisco 3825C, and Cisco 3845C integrated service routers generation 1 C-series.

http://www.cisco.com/en/US/docs/ios/15_1/release/notes/151-2TNEWF.html#wp43314

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I can only think that these are special reduced features models, that Cisco never publicly announced.

However, the release notes says that these models are also supported, not exclusively.

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You are correct, they are not exclusively the only models.  Also, the 2nd generation ISRs are supported.  There is no mention of a standard 1st gen ISR router excep the C-Series.  This is confusing as Cisco has referred to this C series and there is no documentation indicating what a C series is.