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iTV DICTIONARY
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The following
is a list terms commonly used in the interactiveTV industry. If you
find any incorrect information to be incorrect or outdated, please email
us to correct.
**Note:
There are many different kinds of interactive TV technologies and services.
The definitions below will clarify and help you differentiate between
such things as "enhanced TV", "individualized TV", "hypervideo", "NetTV",
"personal TV", and may other terms.
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BACKBONE
A fat pipe within a network. The term is relative to the size of
network it is serving.
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.
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Definitions
provided by:
InteractiveTV Today 
