Bridge Ethernets Over T1?

michael_cain asks: "I have to take a series of demos 'on the road' occasionally and have to have a data connection back to the home lab. In many cases this takes the form of a T1. In order to terminate that at both ends, I currently have to have a CSU/DSU and baby router at each end. I would like to simplify this arrangement; does anyone know of a pair of small boxes that would let me use a T1 as a simple Ethernet bridge (well, a learning bridge would be nice)? Just plug the T1 into one side of each, a 10BaseT or 100BaseT into the other side of each, and relay Ethernet frames back and forth?"