Pins not listed in the tables in this appendix are not connected. The coaxial cable used to connect the Cisco uBR7100 series universal broadband routers at the headend should be very high-quality cable. If signals at the same frequency are carried on long, parallel runs of coaxial cable, interference can occur between the signals. Higher quality cable helps to prevent this with better shielding. Co-channel interference is seen as hum or patterns in analog video channels and intermittent data loss in digital channels.
Larger cables can damage the connectors.
You can identify a crossover cable by comparing the two modular ends of the cable. The colored wires are in the same sequence at both ends of the cable. Each Fast Ethernet port on the router has an RJ-45 connector to attach to Category 3 or Category 5 UTP cables. Use a Category 3 UTP crossover cable when connecting 10BaseT port to a hub. Use a Category 3 UTP straight-through cable when connecting to a PC or other Ethernet device.