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Default gateway
Network device used as a gateway for networks, such
as a local network, to access PCs on an external net-
work. Data is sent using the default gateway if a gate-
way is not specified in the destination IP address.
Cable compensation
Generally, video signals will be attenuated when using a
long cable to connect between the recorder and the
camera. The cable compensation function compensates
this attenuation. In this product, the cable compensation
function compensates video signals from the cameras
connected to the video input connectors 1 - 8 when
using the WJ-HD616K (the video input connectors 1 - 16
when using the WJ-HD716K).
Combination camera (PTZ camera)
Indicates a camera with the panning/tilting and zooming
function. Also known as PTZ camera.
Subnet
A small network used as a unit of administration when a
larger network is divided into smaller networks. Large
networks in corporations, for example, the network can
be broken down into smaller networks called "subnets"
to make the network more manageable and lines used
more efficiently. In this case, these smaller networks are
called subnets.
Subnet mask/Subnet prefix length
Subnet mask consists of 32-bit numeric values.
According to the values, devices can determine which
part of the address is the network address and which
part is the host address.
Sequence
The function that can sequentially display images from
cameras in order set in advance. In this product, the
sequence can be performed during displaying live imag-
es.
Schedule recording
Function that automatically starts video and audio
recording on a preset time schedule.
Secondary (DNS) server
DNS servers usually have more than 2 systems and the
secondary server is the sub system.
If there is trouble with the primary server, the secondary
server takes over.
Full duplex
Communications method that allows simultaneous
sending and receiving by transmitting in both directions
using an independent sending line and receiving line.
Time zone
A time zone is a region or a country that has uniform
standard time.
Multiscreen display
This product can display images from multiple camera
channels simultaneously while displaying live images or
playback images. Displaying of images from 4 cameras
or from 16 cameras simultaneously is called as
"4-screen display" or "16-screen display" respectively.
Electronic zoom
The function that 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.
Coaxial communication
This method is used to control the camera using the
camera control signal through the cable connecting
between the recorder and the camera. In this product,
the cameras connected to the video input connectors 1
- 8 (1 - 16 for WJ-HD716K) can be connected using the
coaxial communication.
Disk configuration (Disk config.)
It is necessary to configure the HDD settings after
replacing, removing, or adding a HDD. "Disk config." is
the menu for configuring the HDD.
Half duplex
Communications method that switches between send-
ing and receiving using a single communications line.
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 compres-
sion rate of video and audio data, and how much data a
communications line can send and receive in 1 second.
Firewall
A type of security used when accessing outside net-
works like the Internet. A PC is used to prevent comput-
ers outside a local network from accessing the network.
Private (IP) 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 it is necessary to
assign a global IP address.
Primary (DNS) server
DNS servers usually have more than 2 systems and the
primary server is the main system.
Plug-in software
Small programs used to add functions to application
software.
Broadband router
Router used to access the Internet via high-speed ADSL
or fiber optic lines.
