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ISPs are often connected to the Internet at large via standard cables called (most frequently) T1 or T3 or (very rarely) T1C, T2, or T4. Each of these cables delivers a certain amount of bandwidth at a particular latency. For a quick comparison, a T1 can move 1.544 Mbps and a T1C 3.152. A T2 delivers 6.312 Mbps. A T3 is capable of 44.736 Mbps and the mighty T4 274.760 Mbps. Compare this with a 56K modem which can only handle 0.056 Mbps.