IOS naming conventions

[rob]

c837-k9o3y6-mz.122-8.YN.bin= IP/FW 3DES

c837-k9o3sy6-mz.122-8.YN.bin= IP/FW PLUS 3DES

I understand the differences between the above IOS and that C837 is the model of the router but does anybody know of a link that provides a breakdown explanation what the k903sy6-mz relates to.

Example: what does the y stand for?

Thanks

[liviu.gheorghe]

y6 is IP;

o is FW;

s is PLUS;

k9 is 3DES;

Cheers