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image sensors (CMOS sensor), data converters, and highly integrated transceivers for many types
of communication.
Dynamic DNS is a method/protocol/network service that provides the capability for a
networked device, such as a router or computer system using the Internet Protocol Suite, to notify
a Domain Name System (DNS) name server to change, in real time, the active DNS configuration
of its configured hostnames, addresses or other information.
DHCP (Dynamic Host Configuration Protocol) is a protocol that lets network
administrators automate and centrally manage the assignment of Internet Protocol (IP) addresses
to network devices in a network. DHCP uses the concept of a "lease" or amount of time that a
given IP address will be valid for a computer. The lease time can vary, depending on how long a
user is likely to require the network connection at a particular location. DHCP also supports static
addresses for e.g. computers running web servers, which need a permanent IP address.
Digital zoom is a method of decreasing (narrowing) the apparent angle of view of a digital
photographic or video image. Digital zoom is accomplished by cropping an image down to a
centered area with the same aspect ratio as the original, and usually also interpolating the result
back up to the pixel dimensions of the original. It is accomplished electronically, with no adjustment
of the camera's optics, and no optical resolution is gained in the process.
Domain server can also be used by organizations that wish to centralize the management
of their (Windows) computers. Each user within a domain has an account that usually allows them
to log in to and use any computer in the domain, although restrictions may also apply. The domain
server is the server that authenticates the users on the network.
Ethernet is the most widely installed local area network technology. An Ethernet LAN
typically uses special grades of twisted pair wires. The most commonly installed Ethernet systems
are 10BASE-T and 100BASE-T10, which provide transmission speeds up to 10 Mbps and 100
Mbps respectively.
Factory default settings are the settings that originally applied for a device when it was
first delivered from the factory. If it should become necessary to reset a device to its factory default
settings, this will, for many devices, completely reset any settings that were changed by the user.
Firewall works as a barrier between networks, e.g. between a Local Area Network and the
Internet. The firewall ensures that only authorized users are allowed to access the one network
from the other. A firewall can be software running on a computer, or it can be a standalone
hardware device.
Focal length is measured in millimeters; the focal length of a camera lens determines the
width of the horizontal field of view, which in turn is measured in degrees.
FPS (frames per second) a measure of how much information is used to store and display
motion video. The term applies equally to film video and digital video. Each frame is a still image;
IP Video Door Station DS03M(P) Operation User Manual
Appendices
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