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A Glossary
Annex A
The following list covers most of the abbreviations, acronyms and terms as used in
Ericsson Manuals, User and Reference Guides. All terms may not be included in
this Reference Guide.
μm
Micrometre (former name - micron): a unit of length equal to one
millionth (10-6) of a metre.
1000BaseT The term for the Electrical Gigabit Ethernet interface. This is the
most common interface for Gigabit Ethernet. Most Gigabit-enabled
PCs and equipment use this interface.
3:2 pull-down A technique used when converting film material (which operates at
24 pictures per second) to 525-line video (operating at 30 pictures
per second).
4:2:0 Digital video coding method in which the colour difference signals
are sampled on alternate lines at half the luminance rate.
4:2:2 Digital video coding method in which the colour difference signals
are sampled on all lines at half the luminance rate.
422P@ML 422 Profile at Main Level: A subset of the MPEG-2 standard, which
supports digital video storage (DVD etc.) and transmissions up to 50
Mbps over various mediums. Used for Contribution and Distribution
applications.
5B6B
5 Binary Bits Encoded to 6 Binary Bits: Block code.
ADPCM Adaptive Differential Pulse Code Modulation: An advanced PCM
technique that converts analogue sound into digital data and vice
versa. Instead of coding an absolute measurement at each sample
point, it codes the difference between samples and can dynamically
switch the coding scale to compensate for variations in amplitude
and frequency.
ACC
Authorization Control Computer.
ADT
Audio, Data And Teletext.
AFC
Automatic Frequency Control.
AFS
Automation File Server.
AGC
Automatic Gain Control.
EN/LZT 790 0005 R1A
A-1