Glossary
© 2012 Harmonic Inc.
202
ProView 7000 v.2.6, Rev. E
Glossary
Numerics
10BASE-T
An IEEE standard, sometimes called “
Ethernet,”
that uses a twisted pair cable, with RJ-45 connectors,
often connected in a star configuration through a hub. The maximum allowable cable length is 328
feet. A 10BASE-T system operates at 10 Mbps.
100BASE-T
An IEEE standard, sometimes called “
Ethernet,”
that supports data rates up to 100 Mbps, also known as
Fast Ethernet. 100BASE-T uses twisted pair cable.
See also
3:2 pulldown
A method that converts 24 frames per second motion picture film frame rate material to 30 frames per
second interlaced video frame rate. This process is normally done by a
telecine
. It refers to using two
film frames to generate five video fields of interlaced video (1080i or 480i). The first frame is scanned
three times to generate three video fields, the second frame is scanned twice to generate two video
fields, and the cadence continues. Note that every fifth frame will have images from different film
frames. These are termed “dirty frames” as there may be significant differences in the two fields of
video. The 3:2 process can also be applied for 720P progressive video, this results in a 2:3 cadence of
video frames, without the “dirty frame” artifacts.
4:2:0
A component digital system that subsamples chroma components both vertically and horizontally by a
factor of two with respect to luma.
A
AAC LC
Advanced Audio Codec Low Complexity.
AC-3
Also known as Dolby Digital.
ACM
A card for the MN20 multiplexer. The ACM supports DES and DVB protocols.
adapter
A circuit board in a Harmonic encoder. Adapters have input or output ports. Also known as a card or a
blade.
