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To use the glossary, simply click on the first letter of
the term of interest below:
B
- B2B
- Business-to-Business, an aspect of e-commerce over the
Internet.
- B8ZS
- Bipolar with 8 Zeros Substitution. A method for 1's
density control for bipolar transmission signals such as T1. See also
D4.
- B - Y
- Blue minus luminance (Y). One of two color difference signals
used in encoding NTSC composite television signals.
- Bandwidth
- The difference between the highest and lowest frequencies
passed by an analog communications channel, device or system.
-
- A data communication system's data transfer
capacity.
- BAS
- Bit-rate Allocation Signal. In Rec. H.221, T.120 et
al, a data word within the frame structure used to transmit commands,
control and indication signals and capabilities.
- BBC
- British Broadcasting Corporation.
- BCH (Bose-Chaudhuri-Hocquenghem)
- A low-overhead forward error correction technique often used
for videoconferencing as in H.261 et al; especially effective for
correcting single (non-burst) errors.
- Bell System
- A group of affiliated RBOCs (Regional Bell Operating
Companies) in the USA, which operate under consistent rules and specifications,
many of which are set by AT&T.
- BER
- Bit Error Rate, the absolute number of errors that may be
present, often expressed as FFx10-y, where FF is a floating point
value and y is an exponent. For example, 3.456x10-8 See also Bit
Error Rate.
- Bit
- BInary digiT, the smallest unit of data. In uncompressed or
uncoded data, it represents a binary 1 or 0.
- bps
- Bits Per Second, a measurement of data rate, generally
excluding the contributions or effects of error correction, encryption,
framing, synchronization and similar such signals.
- Bit Error Rate (BER)
- A measure of quality of digital transmission systems.
Expresses the ratio of correct bits to erroneous bits. To overcome transmission
errors, many codecs include forward error correction, important for
accurate recovery of transmitted, compressed data.
- Bluetooth
- A wireless system operating in the 2.4 GHz ISM band; intended
initially as a short-range cable replacement technology.
- BNC
- Bayonet Neill-Concelman. A type of bayonet-lock coaxial cable
connector used for video and telecommunications.
- BOC
- Bell Operating Company.
- BRA
- European term for BRI
- Breezeway
- That portion of a composite video signal between the end of
the trailing edge of each horizontal synchronization pulse and the beginning of
the color reference burst signal (television communications usage).
- BRI
- ISDN Basic Rate Interface, 2B+D. In the US, B may
equal 56- or 64-Kbps. The D or signaling channel is 16 Kbps.
- BT
- Bluetooth; also the product of: symbol rate, Gaussian
filter and bandwidth; used in DECT and other Bluetooth devices.
-
- British Telecom, the major telecommunications common
carrier in the UK.
- Byte
- Originally coined as a data chunk of from 1- to 6-bits, later
up to 9-bits, spelled with a "y" to avoid confusion with bit. In modern
usage, a byte is 8-bits, like octet, the ITU term which has always represented 8-bits.
To use the glossary, click on the first letter of
the term of interest:
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