In a WAN, each remote parts(about 30 each contain two Class B IP addresses) connect to headerquarter through a E1 line. In center,the E1s convert to 10BaseT Ethernet through a Patton Modem(2701).
Now, these 10BaseT intefaces(about 30) must be connect to central router that is a Cisco 12000 router.
Unfortunately, cisco 12000 routers don't have 10baseT interfaces( it support only Fast Ethernet through an Eight-Port Fast Ethernet Line Card ).
How can we connect these interfaces to the router, so don't create any bottleneck in network?