T1 is defined as 1.5 Megabit Symmetric Service.

The difference isn't in the cable. It's in the service. RG6 Cable is used by many cable ISPs like Time Warner. The difference usually lies at the interface level.

T1 is more expensive because it comes with a Service Level Agreement which basically means super fast support. Any time lost is money refunded. It's also dedicated bandwith. Cable ISPs can slow down significantly during times of congestion. They also can take days to weeks to show up onsite.

Sandeep Luthra | LTMedical.net
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