FAQ Glossary

Title Definition
CMOS CMOS sensors have lower quality, lower resolution and lower sensitivity. CMOS cameras are usually less expensive and have great battery life, but the color is not accurate, displaying trees and grass in purples and pinks.
COMMAND PORT The command port is the port used to log in to the DVR menu using either Internet Explorer or the DVR software interface.
CVBS Composite video is usually in standard formats such as NTSC, PAL, and SECAM and is often designated by the CVBS initialism, meaning "Color, Video, Blanking, and Sync."
DHCP Short for Dynamic Host Configuration Protocol, a protocol for assigning dynamic IP addresses to devices on a network. With dynamic addressing, a device can have a different IP address every time it connects to the network. In some systems, the device's IP address can even change while it is still connected. DHCP also supports a mix of static and dynamic IP addresses.
DNS The Domain Name System (DNS) is a hierarchical distributed naming system for computers, services, or any resource connected to the Internet or a private network. It associates various information with domain names assigned to each of the participating entities. Most prominently, it translates easily memorized domain names to the numerical IP addresses needed for the purpose of locating computer services and devices worldwide. By providing a worldwide, distributed keyword-based redirection service, the Domain Name System is an essential component of the functionality of the Internet.
DOME CAMERA A camera that has the lens encased in a domed window. Often used for video surveillance.
DSL Digital subscriber line (DSL) is a family of technologies that provide Internet access by transmitting digital data over the wires of a local telephone network.
ETHERNET Ethernet is the most common type of connection computers use in a local area network (LAN). An Ethernet port looks much like a regular phone jack, but it is slightly wider. This port can be used to connect your computer to another computer, a local network, or an external DSL or cable modem.
FIREWALL A firewall limits the data that can pass through it and protects a networked server or client machine from damage by unauthorized users. A router is a good example of a hardware device that has a built-in firewall.
FIRMWARE Firmware is a software program or set of instructions programmed and stored in the flash ROM of a hardware device. It provides the necessary instructions for how the device communicates with the other computer hardware.