56k modems connect to the Internet by dialing a service number on an analog telephone line. They can reach maximum speeds of 56 kilobits per second (kbps), but actual connection speeds are much slower because telephone lines have limited carrying capacities. Because they rely solely on the telephone service, they block regular access to the telephone line and are prone to physical interference. Although faster modems such as DSL and cable are now available, 56k modems are still widely used because of their lower costs.
Interface: Choose a 56k modem that fits into available ports or slots on your computer. Serial ports are the most reliable for stationary computers because they can handle higher speeds than USB ports. USB modems are ideal for use with multiple computers. For laptops, choose an internal PCMCIA card to improve mobility. Processor speed: Make sure your 56k modem is appropriate for your computer's processor speed. Choose a hardware modem for processors below 300 MHz, a DSP modem for processors between 300 MHz to 1.0 GHz, and a softmodem for processors above 1.0 GHz.
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