I'd use 15327 w/ OC-12 between sites and T-1 from the each 15327 to its adjacent 3660 router. You can implement ring, mesh, or partial mesh of circuits for router-to-router connectivity.
I'd suggest HDLC framing on the router ports and a full mesh of circuits if you have site-to-site traffic pattern. Alternatively, if the traffic pattern is hub and spoke, create circuits to match this pattern.
Option 1: Via a TDM/SONET architecture, you could use the ONS15327 or ONS15454 at each site for full connectivity at DS1/DS3/10-100-1000 BT connections, UPSR or pt-2-pt links. Management is via Cisco Transport Controller (CTC) which resides on the box, you just need a web browser.
Option 2: Via 3550s with LX GBICs, for gigabit connectivity to each site.
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