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Glossary
This manual uses the following words.
ActiveX Control
A software module developed by Microsoft. It is used to add
functions, downloaded from a web server via the Internet or an
Intranet, to Internet Explorer. The recorder uses it to display video.
Bit rate
Indicates how many bits of data can be processed or transmitted in a
unit of time. Generally, the units are in bps, or bits per second. Used
to indicate the compression rate of video and audio data, and how
much data a communications line can send and receive in 1 second.
Broadband Router
Router used to access the Internet via high-speed ADSL or fiber
optic lines.
Cable Modem
Device used for connecting to the Internet via a CATV line. Called a
cable modem because it functions similar to a modem on a phone
line. It differs from regular modems that use a serial port in that it is
connected to a PC via an Ethernet connection.
Camera operation
Operations of the camera connected to the recorder such as pan
and tilt (horizontal and vertical position), zooming, focusing,
brightness, preset motions (movement towards a set horizontal and
vertical position) and auto functions (automatic camera rotation,
etc.).
DDNS
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 updating information on the DNS server and reduces
the load on the network.
DHCP
A protocol that enables PCs to automatically get information from a
server needed for accessing a network.
DHCP Server
Maintains network-related information (assigns IP address ranges to
(default) gateway servers and clients), and distributes that
information when clients request it.
DNS
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.
Default Gateway
Network device used as a gateway for networks, such as a local
network, to access PCs on an external network. Data is sent using
the default gateway if a gateway is not specified in the destination IP
address.
Disk Configuration
Configure the HDD after replacing, removing, or adding a HDD. Disk
Configuration is the menu for configuring the HDD.
Electronic Zoom
Enlarges live images and playback images during playback. The
electronic zoom enlarges the images by the recorder and is separate
from the zoom function included as part of the camera operations for
enlarged images.
Emergency Recording
Gives priority to recording video and audio when an emergency
occurs using the external switch connected to the recorder.
Ethernet
LAN communication developed by Xerox.
Event
Indicates an occurrence that causes the recorder to take an event
action. Events include, terminal alarms, command alarms, and site
alarms.
Event recording
Function that automatically starts video and audio recording when
an event occurs. Event recording includes Pre-event recording that
records images before the event and Post-event recording that
records images after the event.
External Recording Mode
Use the external switch connected to the recorder to switch to time
tables such as the recording settings and event action settings.
FTP
A protocol that is commonly used for transferring files over the
Internet.
Firewall
A type of security used when accessing outside networks like the
Internet.
Full Duplex
Communications method that allows simultaneous sending and
receiving by transmitting in both directions using an independent
sending line and receiving line.
Global Address
IP address assigned to each device connected to the Internet that is
equivalent to an address on the Internet. IP address is required for
Internet communications.
HDD
Abbreviation for hard disk drive, a type of mass storage device.
Camera images are recorded onto a hard disk drive.
HTML
HTML is a markup language used for describing the logical structure
of a document and its appearance. Links to images, audio, video
and other documents can be inserted into the document. A web
browser is used to view documents written in HTML.
Half Duplex
Communications method that switches between sending and
receiving using a single communications line.