Hello Deepak,
AS5400 can obviously be used as a conventional router. You can configure the linecards on the 5400 for sync serial, ISDN/CAS , E1R2 etc etc. AS 5400 supports all popular routing protocols like OSPF, EIGRP, BGP etc. For other additional routing features, you need to check the release notes of the IOS running on the AS5400.
Hope this helps.
Raj