Binding (2) T-1 connections on Routerboard w/Mikrotik O

Alright here goes, is there and cards that will allow 2 T-1’ to Bound like Cisco PPP for the routerboard? What are the mini PCI /CSU/DSU for the circuit imput? And where can I find the info for configuration in Mikrotik OS? I thank you in advance for any help that you can lend.