Cable networks have dedicated frequencies for delivering video, voice and
Internet services without congestion. Cox even has additional bandwidth
reserved for the next generation of services yet to be developed due to the
750 MHz capacity of its network and plant. Telephone lines are limited
to approximately 1 MHz of bandwidth, which must be shared between voice and
data services. Since cable services all use distinctly different channels,
you can watch TV, talk on the phone and surf the Internet simultaneously
without impacting any individual service.