Fujitsu IP-HE950 Hardware User's Manual page 89

IP-HE950 Hardware User's Guide
HD-SDI (High Definition television
- Serial Digital Interface)
HD-SDI is the serial digital interface to transmit
HD (High Definition) video signals, whose
transmission rate is 1.485 Gbps. It can transmit a
multiplexing HD video signal, PCM audio signal,
and data signal like a timestamp.
HTTP (Hyper Text Transfer Protocol)
Protocol used for sending and receiving files and
other data between a Web server and Web
browser
Hub
A concentrator required for using
10BASE-T/100BASE-TX/1000BASE-T as a local
area network (LAN) standard. Twisted pair cables
are used to connect hubs. Examples include hubs
that conform to 1000BASE-T and switching hubs
that have switching functions.
IP (Internet Protocol)
Protocol used between host computers to transfer
packets over all of the Internet. The codes that
identify the destinations and senders in packet
transfers are called IP addresses. An IP address is
a 32-bit code that can identify a network and host
in the network. A unique IP address must be
assigned to each host that communicates on the
Internet.
IP address
A code used for identifying a node (e.g., PC)
operating using TCP/IP. This 32-bit number is
divided into four 8-bit sections. An example of this
is 200.10.101.1.
IP multicast
Technology for transmitting identical data to
multiple remote destinations simultaneously using
TCP/IP. An address system called Class D is used
for multicasting. In the Class D address system,
the first four bits (1110) indicate a multicast, and
the remaining 28 bits specify a multicast group.
Path control methods for IP multicasting include
PIM and DVMRP, but no one method has become
the standard yet.
LAN (Local Area Network)
A data communication system in a specific area
(maximum of 6 miles or about 10 km). It provides
moderate to high data transfer speeds.
LED (Light-Emitting Diode)
The IP-HE950 has power LED and alarm LED
lamps. The power LED lamp lights up in green to
indicate that the power is on. The alarm LED lamp
lights up in orange to indicate that an alert has
been generated.
MPEG-4
A video data compression method that is a part of
the MPEG standard. MPEG-4 was designed to
distribute video images of low picture quality (due
to a high compression ratio) over slow
communication lines (e.g., cellular phone and
telephone lines). MPEG-4 was also designed to
transmit video together with audio at about 64
kilobits per second. The name of this standard
comes from the name of the organization
promoting standardization of color video
compression encoding formats. MPEG-4 defines
a framework for an object encoding format that
can be flexibly extended comprehensively,
including not only natural images and audio but
also various media such as computer graphics
and text. It covers a wide range of transmission
speeds from a low bit rate of several kbps to
several Mbps. The aim is to become the
multimedia encoding format that can be practical
to use from mobile terminals and other
applications with low bit rates.
PING
A command supported by operating systems such
as UNIX and Windows 9x/NT. It is used in a
TCP/IP network to check whether IP packets can
reach or have reached the communication
destination.
Proxy
A computer or software placed between a
company's intranet and the Internet to act as an
"intermediary" for intranet computers that cannot
connect directly to the Internet. These computers
are connected to the Internet by the proxy.
PS (Program Stream)
An MPEG2 method of multiplexing audio, video,
and data. The PS method is used for transmission
and storage in an error-free environment.
RS-232C
Interface standard that was mainly established by
Electronics Industry Association (EIA) for
communication between data terminals and data
communications equipment.
RS-422
One of the standards for serial communication
standardized by the Electronics Industries
Association (EIA). RS-422 data transmission can
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Glossary