Fujitsu IP-920 E/DC Hardware User's Manual page 100

Glossary and Index
standard. Twisted-pair cables are used to con-
nect hubs. A high-speed hub conforms to
100BASE-TX, and a switching hub has 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 allocated to each hosts that
communicates on the Internet.
IP Address
Code used for identifying a node (e.g., PC)
operating using TCP/IP. This 32-bit number is
divided into four 8-bit sections, and an example
of this is 200.10.101.1.
IP Multicast
Technology for transmitting identical data to
multiple remote destinations simultaneously us-
ing 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 multi-
cast, and the remaining 28 bits specify a
multicast group. Path control methods for IP
multicasting are PIM and DVMRP, but no one
method has become the standard yet.
LAN (Local Area Network)
Data communication system in a specific area
(maximum of 6 miles or about 10 km).
provides moderate to high data transfer speeds.
LED (Light-Emitting Diode)
The IP-920E/DC has a power LED lamp and
alarm LED lamps. The power LED lamp is lit in
green to indicate this equipment is on.
alarm LED lamp is lit in red to indicate that an
alarm has been generated.
MPEG-4
Standard for the compression and coding
of color video for storage purposes, and the
name of the organization
standardization is used in the name of the
standard. MPEG-4 handles not only regular
image and voice data but also a comprehensive
range of multimedia data, including computer
graphics and text.
framework for a scalable object encoding system
depending on technological developments.
has a transfer speed ranging from several tens
of Kbps to several tens of Mbps (low bit rate
IP-920E/DC
An
promoting this
It defines a flexible
to wide range).
communication by general-purpose multimedia
encoding systems on mobile terminals.
PING
A command supported by operating systems
such as UNIX and Windows that are used in a
TCP/IP network to determine whether IP packets
can reach or have reached a communication
destination.
PPPoE (Point to Point Protocol over Ethernet)
This is the user authentication standard for the
connection like PPP connection on the Ethernet
network.
PS
MPEG-2 method of multiplexing audio, video and
data. It is an abbreviation of Program Stream,
and it is used for transmission and
error-free environment.
RS-232C
Interface standard that was mainly established by
the Electronics Industry Association (EIA) for
communication between data terminals and data
communications equipment
SD-SDI (Standard Definition television – Serial
Digital Interface)
Standard definition
standardized in SMPTE259M.
SELV (Safety Extra-Low Voltage)
SELV is a secondary circuit protected in the
It
structure that electrical potential difference between
any two touchable points is not dangerous under the
normal condition or even under the condition that
any one point is broken.
It is a circuit that line voltage or potential difference
from earth is quasi peak value: 42.4V, DC: up to 60V.
SG (Signal Ground)
Ground for signals
Subnet Mask
Mask value used for obtaining a subnet network
address from an IP address.
address is obtained by using an AND operation
between an IP address and subnet mask.
TCP (Transmission Control Protocol)
Abbreviation of Transmission Control Protocol,
the protocol required for direct connection to the
Internet. In the OSI reference model, TCP
It
corresponds to the transport layer and IP
corresponds to the network layer. TCP has been a
86
It is intended for low-speed
storage in an
digital video
The subnet
interface