Ethernet over Copper is delivered over twisted copper pairs. EoC is available in speeds from 3 to 45megs of bandwidth. Most carriers deliver 3megs on 2 sets of copper pairs. A 30meg circuit will most likely be delivered on 3 or more pairs. This type of provisioning adds extra redundancy as compared to a DSL circuit. For example, if multiple pairs are used to deliver bandwidth and one or two pairs fail, the connection is not completely down. The user will still have a data or internet connection, but at a lower speed until a repair is made. DSL on the other hand does not have that protection.