A cable modem provides a bridge between a customer's LAN and the coaxial cable network of the ISP. In other words, it functions as a bridge as well as a modem. The cable modem is necessarily complex in order to function in both these capacities.What is the best cable modem to buy?
Best Versatility: ARRIS SURFboard SB6141 DOCSIS 3.0 Cable Modem. Most available cable modems meet all these demands, but the ARRIS SURFboard SB6141 probably strikes the best balance of all of them. It has something called DOCSIS 3.0 technology, which unites up to eight downstream channels and four upstream channels,...How much does a cable modem cost?
Most cable modems are external, although rare internal modems are available. A cable modem costs $40-$90 . For example, Circuit City, an online-only retailer, sells the standalone Motorola SURFboard SB5105 [ 1] cable modem for $60. Some cable modems are combination devices with routers, which create a wireless network. These devices cost $80-$200.