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Appendixes
IP-900 Series
122
receiver to correct errors without the need to
request the sender for retransmission.
Flow Control
The procedure for controlling the flow of data
between two devices. Its purpose is to prevent
data from being lost when a device buffer
becomes full.
GATEWAY
A node that connects network systems that use
different protocols. A gateway basically converts
one protocol into another to support operation
between two networks. In a looser sense,
gateway sometimes means a machine that
transfers information between any two
networks.
GOLD CODE SEQ N
An index number that generates the initial
values used to generate the Gold code, which is
used for physical layer scrambling processing in
the DVB-S2 standard.
GOP (Group Of Pictures)
The smallest of the structural units composing
a movie. A GOP consists of 3 types of frames: I
frame, P frame, and B frame.
HDCP (High-bandwidth Digital Content
Protection system)
One of the copy protection technologies for the
illegal content copy between the video player
and the video display.
HD-SDI (High Definition television - Serial
Digital Interface)
HD-SDI is the serial digital interface to transmit
HD (High Definition) video signal, which
transmission rate is 1.485 Gbps. It can transmit
multiplexing HD video signal, PCM audio signal
and data signal like time stamp.
HDMI (High Definition Multimedia Interface)
One of the multimedia interfaces integrated the
audio, video and control and communicate each
other.
H.264
One of the video compression coding systems
standardized in ITU (International
Telecommunication Union) in May, 2003. It is
also standardized as a part of MPEG-4
(MPEG-4 part 10 Advanced Video Coding) in
ISO (International Organization for Standard.)
Therefore, it is commonly called H.264/MPEG-4
AVC or H.264/AVC, showing both of parties.
This technology is used for the various
applications from the low bit rate and low
resolution like the mobile TV to the high bit rate,
high resolution like HDTV. It is improved that the
data capacity is half comparing MPEG-2 used
wide spread.
HTTP (Hyper Text Transfer Protocol)
The protocol for tranferring files and other data
between a Web server and a browser.
HUB
A concentrator required to use 10Base-T or
100Base-TX as a local area network (LAN)
standard. Twisted-pair cables are used to
connect hubs. A high-speed hub conforms to
100Base-TX. A switching hub has switching
functions.
IBBP/IBP/IPPP/PPPP
Video encoding structure with using I, P, and B
frame.
I frame: Intra frame. Frame encoded by using
internal video information.
P frame: Prediction Picture frame. Frame
encoded by using correlation with
previous frame.
B frame: Bi-directional Interter frame. Frame
encoded by using previous and next
coming I frame or P frame.
IF-band
A part of a very high frequency band (VHF
band: 30 to 300 MHz.) The IF-band is selected
only if an IF-band modulator card is used for
operation.