BANDWIDTH- 1. (broadcast) The range of frequencies available for signaling. The difference expressed in cycles per second (Hertz) between the highest an lowest frequency of a band – James Martin 1971. 2. (data wire) Analog telephone lines measure capacity in Hertz (the difference in the highest and lowest frequency in the channel). Digital channels measure capacity in bits per second. A T3 connection is approximately thirty times as fast as a T1 connection, which is 50 times as fast as a 28.8 modem, which is twice as fast as a 14.4 modem.
Broadcast: 6 MHz analog
Cable: 450 MHz analog signal
Cable Modems: up to 27 mps downstream - shared
Internet data: 14.4k - 26 Mpbs with VDSL
VBI: 4 Mbps
Digital Signal: 19.2 Mbps
BROADBAND - A network capable of delivering high bandwidth. Broadband networks are used by Internet and cable television providers. For cable, they range from 550 MHz to 1GHz. A single TV regularly broadcast channel requires 6MHz, for example. In the Internet domain, bandwidth is measured in bits-per-second (BPS). See DSL.
CABLE MODEM - A device that permits one-way or two-way high speed data communication over a cable television system for purposes such as Internet access at speeds of around 1.5 MBps.