There is no 10Gb ethernet card for 15454 which you want to take over OC 12/48 rings. (There are 10G cards for DWDM box).
As far as I know ethernet are point to point links means you have Ethernet interface at client side and in core network they go as T1/E1 and same speed on both client interface.
Let see you have 10G client ethernet at hub , how can you take a 10G on Oc12/48 Rings.
If it is broadcast 10G then also you need 10G client on other side not lower speed client.
Would you like to share what exactly you want to do?