That depends on your provider. You will have to contact your provider to see how they can deliver and what they can deliver. But basically you get a demarc and you are required to extend or have them extend it to the network interface.
I personally would not look at a legacy T3 or OC12 as far as that goes. You can get more with a FE or GIGE access. I would suggest you look around for a provider that provides or resell MetroE deliveries or provides native Ethernet handoffs. Here in BellSouth for example, I can get either copper access 100baseT or optical ( upto 1GIGE). I would also suspect in the near future once they receive the demands for 10GIGE, 10GIGE optical will be common. To give you come comparison; A 100meg FE is like 2.1 times more than a DS3 A 1000baseT is nearly 1.6 times more a OC12. Also keep in mind, why Ethernet is more advantageous; you don't need any expensive WAN cards and way easier to troubleshoot. Hopes this helps.
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