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A typical residential cable modem connection ranges anywhere from 3 to 15 Mbps (Megabits per second) downstream, and 1-3 Mbps upstream.Cable modem speed is not guaranteed and often fluctuates, since the available bandwidth is shared between many users on the same node. Cable modems are also typically capped at a particular speed, depending on your

Even if the modem has both Ethernet and USB ports, chances are only one can work at a time and you will need additional hardware/software to share the Internet connection. The easiest way would be to buy a broadband router and connect it between the cable modem and PCs. 

Cable modems operate as their name suggests, by Modulating and Demodulating cable transmission signals. The CNS state-of-the-art headend unit receives the high-bandwidth data from the Internet and transfers it to your home or business. Your cable modem receives the high-speed data, and the Ethernet card translates the data to your computer.

About 99-inches tip to tip, or about 95-inches of cable (that'd be 8-feet or so).

Yes, especially with analog audio/video connections. The better the cable, the better the picture and sound you'll get. Well-made cables carry cleaner signals over longer distances, and as time goes by, they're less likely to be damaged by the inevitable bending and twisting that most cables undergo. They also offer better shielding, and

As long as they are using the exactly same standard. A DOCSIS cable modem will not work on a EuroDOCSIS system and vice versa. For one thing the downstream (TV) channel width is different. Also note the difference in AC voltage and power plugs.