Phase Alternating Line, is a video display standard used in Europe and certain other parts of the world.PAL uses 625 TV lines per frame and frame rate is 25 frames per second.

Similar to PAL. The output power for PAL 60 is 60 MHz. (PAL is 50 MHz).

The pan function will reposition the focus on different areas of a camera image.

The camera patrols between the preset positions on the Patrol List, which can be modified on the "Camera control page".After one patrol cycle, the camera returns to the original position.

Packet Internet Groper, a command used to test the availability of a host on a network or on the Internet.It works by sending a packet to the specified address and waiting for a reply.

Stands for picture element, the smallest bit of data in a video image.

Power over Ethernet, a technology used to transmit electrical power along with the data.It is used in IP-Surveillance and remote monitoring in places where it is inconvenient to feed the devices power from a power outlet.

Point-to-Point Protocol, a protocol used to communicate between two network devices by using a serial interface.

Point-to-Point Protocol over Ethernet, is a protocol for network devices to communicate by establishing a DSL link connection with the ISP.

The image before and after an alarm is triggered. Those are stored in a buffer for later use, such as sending snapshot or recording.

The opposite of interlaced scan, a method that electronically draws the video picture in one complete pass, rather than the two odd and even passes of interlaced video.

A standard that specifies the format of data and rules for two devices to connect and transmit data to one another.

Low-level protocols define the electrical and physical standard. High-level protocols proceed data format, such as TCP and IP.

A server that provides the service for clients to make indirect network connections to other network services.

Proxy server will save the previous data or resource in a cache when the request is made for first.To provide it when the same request is made again. It could be used to avoid occupying much bandwidth.

One type of VOP, only codes the differences between images. It is more efficient. See VOP.