2 Cisco 2511 Router
1 Cisco/AGS Router
2 Motorola CSU/DSU
2 PCs with network cards
Cables
Manuals
Here's a schematic of the first network you should build:
LAN (PC) <-> router <-> long haul circuit <-> router <-> LAN (PC)
In the first configuration each LAN should be it's own logical and physical subnet.
Here's a schematic of the second network you should build:
LAN (PC) <-> router <-> long haul circuit 1 to Internet <-> router <-> long haul circuit 2 to Internet <-> router
Configure Border Gateway Protocol (BGP) to shape traffic over the two links to the "Internet".