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Annex A
AMOL I and II Automatic Measure of Line-ups I and II: Used by automated
equipment to measure programme-viewing ratings.
ARP Address Resolution Protocol. A protocol used to "resolve" IP
addresses into underlying Ethernet MAC addresses.
ASI
Asynchronous Serial Interface.
ASIC Application-Specific Integrated Circuit: A customized chip designed
to perform a specific function.
Async
Asynchronous.
ATM Asynchronous Transfer Mode: A connection orientated, cell based,
data transport technology designed for Broadband ISDN (B-ISDN).
It provides a circuit-switched bandwidth-on-demand carrier system,
with the flexibility of packet switching. It offers low end-to-end delays
and (negotiable on call set up) Quality of Service guarantees.
Asynchronous refers to the sporadic nature of the data being
transmitted. Cells are transmitted only when data is to be sent,
therefore the time interval between cells varies according to the
availability of data.
ATSC Advanced Television Standards Committee: An organization
founded in 1983 to research and develop a digital TV standard for
the U.S.A. In late 1996, the FCC adopted the ATSC standard, the
digital counterpart of the NTSC standard.
B3ZS Bipolar with Three Zero Substitution: A method of eliminating long
zero strings in a transmission. It is used to ensure a sufficient
number of transitions to maintain system synchronization when the
user data stream contains an insufficient number of 1s to do so.
B3ZS is the North American equivalent of the European HDB3.
Backward
Compatibility
Refers to hardware or software that is compatible with earlier
versions.
BAT Bouquet Association Table: Part of the service information data. The
BAT provides information about bouquets. It gives the name of the
bouquet and a list of associated services.
baud rate The rate of transfer of digital data when the data comprises
information symbols that may consist of a number of possible states.
Equivalent to bit rate when the symbols only have two states (1 and
0). Measured in Baud.
BER Bit Error Rate: A measure of transmission quality. The rate at which
errors occur in the transmission of data bits over a link. It is
generally shown as a negative exponent, (e.g., 10-7 means that 1 in
10,000,000 bits are in error).
BISS Basic Interoperable Scrambling System: Non-proprietary encryption
from EBU (Tech3290).
Bit rate The rate of transfer of digital data when the data comprises two logic
states, 1 and 0. Measured in bit/s.
Block; Pixel Block An 8-row by 8-column matrix of luminance sample values, or 64
DCT coefficients (source, quantized, or de-quantized).
EN/LZT 790 0005 R1A
A-2