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BTW, Cisco rates the 1921 for WAN circuits up to 15 Mbps, and that recommendation is for about every possible concurrent service. So, as Edison says too, 10 Mbps should be fine.
PS:
Oh, do be cautious with FE or gigE interfaces. The 1921 could have an issue with a transient large burst at high speed even if it easily can sustain 10 Mbps.
