Name                                Features                            RAM
--------                            -------------                       -----
c3660-i-mz.120-7.t.image            IP Only                             32
c3660-is-mz.120-7.T.image           IP Plus                             64
c3660-is56i-mz.120-7.xk2.image      IP Plus IPSec 56                    64
c3660-io3s56i-mz.120-7.T.image      IP/FW/IDS IPSec 56                  64
c3660-jo3s56i-mz.120-7.xk2.image    Enterprise Plus IPSec 56            64
c3660-js56i-mz.120-7.T.image        Enterprise Plus IPSec 56            64