The 2811 can support a T3 interface, but it doesn't have the performance to support line rate. In fact, 18 Mbps (duplex) is likely to be difficult for a 2811 to run at full speed too. (If the link isn't often loaded, it works fairly well.)
For a full T3, the safe recommendation would be a 3845, but from personal experience the 3825 seems to often do well too. (From it's specs, the 2851 might come close.)
BTW, I've worked with a 2811 connected to T-3. With complex service config, handles a load of our 10 Mbps (duplex) okay, beyond that it runs out of CPU (NB: CPU is busy at 10 Mbps).
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