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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. 

A wireless router is simply a router that connects to your computer (or computers) using radio waves instead of cables. Just as computers connected to a wired LAN use Ethernet, machines on a wireless LAN use the wireless equivalent, which is called Wi-Fi (or, more technically, IEEE 802.11)

Let's work this from the Wireless Internet Service Provider (WISP) to your computer. From your ISP there will either be cabling or a radio transmitter that will relay signals to a tower. When it is demodulating, it is turning the signal into something your computer will understand.

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.

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.