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FTP
A protocol that is commonly used for transferring files
over the Internet.
Firewall
A type of security used when accessing outside net-
works like the Internet. A PC is used to prevent com-
puters outside a local network from accessing the net-
work.
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 send-
ing and receiving using a single communications line.
IP Masquerading
A technology for sharing a single global address
between two or more PCs. Allows simultaneous con-
nection of multiple machines to 1 global address to
dynamically convert NAT and different TCP/UDP port
numbers.
IP 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.
Internet
PC network that connects networks all over the world.
Different types of PCs can communicate over the
Internet.
LAN
A communications network for connecting PCs, print-
ers 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.
M-JPEG
Video format in which the camera sends continuous
JPEG images.
Compared with sending images from the camera one at
a time, this method reduces the load on the network.
However, the transfer rate may change depending on
the status of the camera. Images may be represented
as a JPEG depending on the camera.
MAC address
Fixed physical address assigned to network devices.
Devices send and receive data based on this.
Manual recording
Click the [Recording] button and the [Recording stop]
button to manually start and stop recording of video
and audio.
Multicast
A way to send the same data to multiple users speci-
fied on a network.
Multiscreen Display
This recorder can display multiple camera channels
simultaneously while displaying live images or playback
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.
POP 3
A protocol for receiving e-mail stored on a server on the
Internet or an Intranet.
