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Glossary
ActiveX Control
A software module developed by Microsoft. It is used to
add functions, downloaded from a web server via the
Internet or intranet, to Internet Explorer. The recorder
uses it to display video.
DDNS (Dynamic DNS)
A technology for dynamically translating DNS server
information to enable the transfer of only differences in
information between DNS servers (refer to "DNS"). This
reduces the data transfer amount necessary for updat-
ing information on the DNS server and reduces the load
on the network.
DHCP (Dynamic Host Configuration Protocol)
A protocol that enables PCs to automatically get infor-
mation from a server needed for accessing a network.
DNS (Domain Name System)
The long lists of numbers or IP addresses that are used
in network environments are difficult to remember, which
makes them impractical. This is why PCs are given an
easy-to-follow name (domain name) which is converted
to an IP address before they are communicated with.
The DNS provides translation between domain names
and IP addresses.
FTP (File Transfer Protocol)
A protocol that is commonly used for transferring files
over the Internet.
HDD
Stands for Hard Disk Drive (a high capacity storage
device). This product uses hard disk drives instead of
video tapes for recording.
IP address (Internet Protocol Address)
The identification number assigned to PCs connected
via IP networks such as the Internet or an Intranet, or to
individual communications devices. Do not assign the
same address to multiple devices, especially on the
Internet.
LAN (Local Area Network)
A communications network for connecting PCs, printers
and other network devices in a relatively small area such
as in a building or floor of a building or campus in which
data is transferred.
MAC address (Media Access Control address)
Fixed physical address assigned to network devices.
Devices send and receive data based on this.
H.264
One of the compression methods of moving images.
NAT (Network Address Translation)
A technology for sharing a single global address
between two or more PCs.
NTP (Network Time Protocol)
A protocol developed to accurately maintain time among
hosts on the Internet.
PS·Data
Stands for Panasonic Security Data. When PS·Data
compatible devices are connected using a RS485 cable,
it is possible to operate the recorder from them or to
operate them from the recorder.
QVGA
Resolution with 320 x 240 pixels.
POP 3
A protocol for receiving e-mail stored on a server on the
Internet or an Intranet.
POP 3 Server
A server that supports POP3, currently the most widely
used mail sending protocol.
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. (RAID 5 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 HDDs have errors, data
can be recovered based on error correction data record-
ed on other HDDs. (RAID 6 is used when 4 or more
HDDs are connected. However, when 3 or more HDDs
simultaneously have errors, data cannot be recovered.)
RS485
When this product is connected to the camera using the
video cable and the RS485 cable, the electrical charac-
teristics of RS485 can make this product to control the
camera.
SD memory card (Secure Digital memory card)
A small, lightweight and removable storage device hav-
ing a large capacity.
SMTP (Simple Mail Transfer Protocol)
A protocol for sending e-mail on the Internet or an
Intranet. Used when transferring mail between servers or
when clients send mail to the server.
SMTP server
A server that supports SMTP, currently the most widely
used mail transfer protocol.
