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POP 3 Server
A server that supports POP3, currently the most widely
used mail sending protocol.
Plug-in Software
Small programs used to add functions to application
software.
PoE (Power over Ethernet)
A technique for supplying power and data simultaneous-
ly over an Ethernet cable. PoE was standardized in
June, 2003 as "IEEE802.3af".
PoE Supplied Hub
A switching hub that provides PoE functionality. A maxi-
mum of 48 V 15.4 W of power can be supplied to cam-
eras and other devices.
Port Number
A sub address set below the IP address to connect mul-
tiple parties simultaneously for communication (TCP,
UDP, etc.) on the Internet.
Primary Server
DNS servers usually have more than 2 system and the
primary server is the main system.
Private Address
IP address assigned when connecting primarily to LAN.
Private IP addresses can be assigned freely on a net-
work and do not require a formal application. However,
because private IP addresses cannot be used to access
the Internet, a router or other device is necessary to
assign a global IP address.
Protocol
A set of rules that allows the exchange of data amongst
different types PCs with information. The Internet uses
the TCP/IP protocol as its base and information is trans-
ferred following http and ftp protocols depending on the
application.
Proxy Server
PC or software that connects with the Internet as the
proxy for a computer on a local network. It allows spe-
cial connections from the internal network and blocks
unauthorized access from external networks.
RAID (RAID5)
An abbreviation for Redundant Arrays of Inexpensive
Disks 5 that provides a highly reliable disk array by dis-
tributing access over multiple HDDs, increasing both
speed and capacity. Even if one HDD has errors, data
can be recovered based on error correction data record-
ed on other HDDs. (RAID5 is used when 3 or more
HDDs are connected. However, when 2 or more HDDs
simultaneously have errors, data cannot be recovered.)
RAID (RAID6)
An abbreviation for Redundant Arrays of Inexpensive
Disks 6 that provides a highly reliable disk array by dis-
tributing access over multiple HDDs, increasing both
speed and capacity. Even if two HDD has errors, data
can be recovered based on error correction data record-
ed on other HDDs. (RAID6 is used when 4 or more
HDDs are connected. However, when 3 or more HDDs
simultaneously have errors, data cannot be recovered.)
Recording rate (ips, I-Frame)
Unit that determines the smoothness when recorded
images are played back. "ips" indicates the number of
recorded frames in 1 second. When the recording rate
is higher, the playback is smoother, but available record-
ing time is reduced. I-Frame indicates the refresh rate
set on the camera.
Resolution
Indicates the smoothness of the image quality and the
size of the images recorded from the camera. Indicates
the number of dots used in the image displayed on the
screen. A horizontal resolution of 720 dots and a vertical
resolution of 480 dots is expressed as 720-480.
Router
Placed in between different networks, a router sends
data to the proper destination via network. If data on the
network is addressed to an external network, routers
send the data to the outside of the network after judging
the optimum sending route.
SD memory recording, SD memory data
SD memory recording is a camera function that saves
images in the camera's internal SD memory when com-
munication with the camera is disconnected within the
time table recording time set on the recorder. SD memo-
ry data refers to those images recorded on the card.
