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Lorex CCTV Glossary

See below for key terms and definitions for the key technologies used in Lorex products.

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A high definition video resolution consisting of 1920 horizontal pixels and 1080 vertical pixels (1920x1080), using progressive scanning. Sometimes referred to as Full HD.



A video resolution common to Security DVR's that consists of 720 horizontal pixels and 240 vertical pixels (720x240). 2CIF gets its name because it has double the horizontal resolution as CIF (Common Intermediate Format).



A device with 2-way-audio allows audio communications in both directions between a transmitter, such as a camera, and a receiver, such as a video monitor or DVR.



A high definition video resolution consisting of 1280 horizontal pixels and 720 vertical pixels (1280x720), using progressive scanning.


Analog Wireless

Wireless technology using radio signals to transmit information. Has limitations such as succeptablity to static interference and interception, as the signals are sent unencrypted on publicly used frequencies.



A smart phone and tablet operating system published by Google. Many different manufacturers create devices using Android.


Aspect Ratio

The ratio between the horizontal and vertical dimensions of a display or image. For example, a square image would have an aspect ratio of 1:1, whereas 1080p video has a widescreen aspect ratio of 16:9 because it has 1920 horizontal pixels and 1080 vertical pixels.


Auto Port Forwarding Wizard

The Lorex Auto Port Forwarding Wizard, or Easy Connect Wizard, is an exclusive software published by Lorex that automates the process of router port forwarding. It has support for thousands of routers. Click here to download the Auto Port Forwarding Wizard.



Bayonet Neill-Concelman or British Naval Connector. BNC connectors lock into place when connected and are commonly used for CCTV camera video cables.



Common Intermediate Format. A video resolution commonly used on Security DVR's that consists of 360 horizontal pixels and 240 vertical pixels (360x240).



A video resolution commonly used on Security DVRs that consists of 720 horizontal pixels and 480 vertical pixels (720x480).



Dynamic Domain Name Service. A Dynamic Domain Name Service maps dynamic IP addresses to a fixed web address, or URL. This ensures that even if a device or server's IP address changes, the same URL can be used to connect to that device or server. Lorex maintains a free DDNS service for customers who purchase a compatible product. Click here for details.



Domain Name Service. A Domain Name Service maps IP addresses to fixed web addresses, or URL's. For example, Google's IP address is A Domain Name Service maps that IP address to, so when you type into your bowser, it goes to that IP address and loads the Google home page. Domain Name Services are maintained by Internet Service Providers (ISPs) and other organizations.



Dynamic Host Configuration Protocol. A protocol to automatically assign IP addresses to devices on a network.


Digital Wireless

Digital wireless is the transmission of audio and video analog signals encoded as digital packets over high bandwidth radio frequencies. Digital wireless provides improvements over analog wireless technologies. For example, it is not prone to static interference or evesdropping by other devices.



Cables with connectors that have a circular pin pattern and are capable of transmitting power, video, and audio on the same cable. DIN connectors are proprietary, meaning specific to the manufacturer, and Lorex DIN connectors have either 4 or 6 pins (depending on model).



Digital Video Interface. A video input/output standard commonly used on Security DVR's and monitors. Carries a digital video signal.


Dynamic IP Address

A Dynamic IP Address is an IP address that is subject to change from time to time. The Internet Service Provider (ISP) uses a protocol called Dynamic Host Configuration Protocol (DHCP) that generates an IP Address and leases (i.e. provides) it to your computer or device for a predetermined length of time. After that time expires, your computer or device must request a new IP address. This means that external IP addresses will change occasionally. Most residential Internet service packages use dynamic IP addresses.



A widely used standard for connecting devices on a Local Area Network (LAN). Also refer to Ethernet cables, which are twisted pair cables using RJ45 connectors.


External IP Address

An External IP Address, also known as a public IP address, is an IP address used to locate a device or network over the Internet. For example, your computer might have the internal IP address, but it connects to the Internet using the external IP address You can use a third party website such as to find your external IP address.



Frequency Hopping Spread Spectrum. A digital wireless protocol that uses a channel hopping sequence based on an algorithm generated by the receiver. As a result, the digital wireless signal is highly secure and resistant to jamming and interference. In FHSS devices, transmitters and receivers must be paired with each other to communicate.


Field of View

The area that the camera can see. Typically measured in degrees, a larger field of view means a camera can see a wider area, but typically with a loss of fine detail.


Fixed Lens

A camera lens where the camera's focal length is permanently set and cannot be adjusted by the user.



Frames Per Second. The number of individual frames (images) per second that make up a video.


Frame Rate

The rate at which a device updates the individual frames (images) in a video. Frame rate is often measured in FPS, or Frames Per Second. 30 FPS or higher is considered a real-time frame rate because the human eye perceives movement at that frame rate as natural (i.e. not jittery) movement. 30FPS is the standard for television broadcasting in North America.


H.264 is a video compression standard with increased compression over MPEG-4, and better transfer speeds over a network. Also known as MPEG-4 AVC (Advanced Video Coding).



High Definition Multimedia Interface. A standard for transmitting uncompressed high defintion video and audio from a source to an output device, such as a TV. HDMI cables carry a digital signal.



High Definition Serial Digital Interface. A standard for providing uncompressed high definition broadcast-grade video over standard coaxial cable (typically RG59). HD-SDI DVR's and cameras are not compatible with standard definition DVRs and cameras.



An invisible form of light with a wavelength between 750nm and 1mm (higher than that of visible light). The human eye cannot see infrared light, but cameras sensors can detect it, which is why it used by CCTV cameras to see in the dark.


Infrared (IR) LEDs

Infrared LEDs are lights that emit infrared light. They are installed in day/night cameras to enable the camera to see in the dark, even in total darkness (0 Lux). Infrared light is emitted from the LEDs, reflects off the scene, and returns to the camera.


Infrared (IR) Cut Filter

An IR Cut Filter, also known as an Auto Mechanical Infrared Cut Filter, blocks infrared light but allows colors visible to the naked eye to pass through. This prevents any discoloration in the image caused by environmental infrared light (the sun and incandescent light, for example, emit infrared light). During low/no light conditions, the IR Cut Filter moves away from the lens to let in 100% of the infrared light for maximum night vision performance. Not all day/night cameras have an IR Cut Filter.


Ingress Protection (IP) Rating

IP Ratings determine how resistant electrical equipment is to penetration by dust and liquids. They are made up of 2 numbers (e.g. 54 or 66): the first is resistance against solid objects and the second is resistance against liquids. Click here for more information.


Internal IP Address

An Internal IP Address (also known as a local or private IP address) is an IP address used to connect to a device on a Local Area Network (LAN). For example, is an internal IP address.



A smart phone and tablet operating system used on the iPhone and iPad. It is published by Apple.


IP Address

A numerical address used to locate a device on a network. An IP address using Internet Protocol version 4 (IPv4) is a 32-bit number, divided into 4 8-bit sets. An example of an IP address is


IP Camera

An IP Camera or Network Camera is a camera that connects directly to a network router, and is not reliant on a computer to work. Data from the IP camera is transmitted through the network, and can be securely viewed at a remote location.


ISP (Internet Service Provider)

An ISP is a company that provides residential or commercial Internet service.


A LAN or Local Area Network is a connected group of computers and devices, which generally shares one connection to the Internet. Communications over a LAN are typically faster than over the Internet.



A Lens is an optical device that controls how light reaches a camera sensor. Lenses can control how much light reaches a camera sensor, and they can also refract or bend light to control how the resulting image appears. For example, light can be bent to ensure that the resulting image appears flat, rather than curved. CCTV cameras have either fixed lenses, which are permanently set, or varifocal lenses, which can be adjusted by the user.



A unit measurement of the intensity of light. For example, the light of a full moon is about 0.1 Lux, while bright sunlight is about 100,000 Lux. 0 Lux is total darkness, and cameras rated for 0 are considered to be night vision cameras.


Mac computers are produced by Apple, and run the Mac OS operating system.


MAC Address

The Media Access Control (MAC) Address is a device's 12-digit hardware address that identifies the device on a LAN. A MAC address is unique to each network device. MAC Addresses follow a specific format: mm-mm-mm-ss-ss-ss. The mm's are the manufacturer’s ID number and the ss's identify the product’s ID number. An example of a MAC address is 78-AC-C0-B2-AA-44.


Mobile Apps

Software applications that are created for smart phones and tablets.


Mobile Internet

Technologies that allow smart phones and tablets to access the Internet over cellular data networks. Common standards for cellular data networks include 3G, 4G, and LTE.



Network Time Protocol. A protocol for automatically syncing computer or device clocks with a remote Internet time server.



A process of programming digital wireless devices to communicate with each other.


Generic term used to refer to computers running Microsoft Windows operating system. Many different manufacturers produce PCs.


PIR (Passive Infrared) Motion Sensor

A PIR Motion Sensor detects motion by looking for changes in temperature at any given point in its field of view. If a person walks in the PIR motion sensor's field of view, the PIR motion sensor will detect the movement of the person's body heat.


Port Forwarding

Port Forwarding tells a router which device on the internal network to send external traffic to. When you set up port forwarding on your router, it takes the traffic from the "external IP address:port number" and sends that data to an "internal IP address:port number" (e.g. Router External IP to DVR Internal IP Lorex has an Auto Port Forwarding Wizard that automates the port forwarding process for thousands of different router models.


PTZ Camera

Pan-Tilt-Zoom Camera. A camera that can change its viewing angle or zoom level using internal motors. PTZ cameras generally connect to a security DVR using RS-485 connectors.

RCA Cables

RCA cables are used to carry video or audio signals. They are commonly used on TVs and other A/V equipment.



A receiver is a device that receives radio frequency signals sent by a transmitter. For example, a receiver for a wireless camera receives video image signals from the camera and outputs them to a built-in or external display.


Remote Viewing

Remote Viewing allows you to connect to a camera system or camera to view the video on a computer, smart phone, or tablet over the Internet or a LAN. Some systems allow futher functionality over the Internet, such as playback of recorded video or system configuration.



High-grade coaxial cables that are suitable for transmitting HD-SDI video signals.


A twisted pair connector commonly used for Ethernet cables.



A router is a device that sends network traffic between different computers and networks.



A format for communicating with PTZ cameras using two wires connected to a DVR.

Security Camera

A camera designed for survelliance purposes.


Security DVR

A device that records the video images from multiple security cameras to a hard drive.



Service Set Identifier. A SSID is the network name associated with a WiFi network.


Static IP Address

An IP address that is permanently assigned and does not change. Static IP addresses are typically only included with more expensive commercial Internet plans.


Security Certified Hard Drive

Hard drives especially designed to meet the demands of a security environment, including 24/7 operation and simultaneous recording and playback from various streams. Security certified hard drives deliver high quality performance, efficiency, and reliability.



A camera's Sensor processes optical information (i.e. light) into electronic signals, which can then be recorded or shown on a monitor.


A Transmitter is a wireless device that sends signals to a receiver. For example, a wireless camera sends video signals to a wireless receiver, which outputs them to a built-in or external display.



TVL or Television Lines is the horizontal resolution that can be produced by a camera. TV Lines are measured by taking a portion of an image's width equal to the heigh and counting the number of vertical lines displayed. Click here for more information.



Uniform Resource Locator. A text address used to locate a resource, such as a website, on the Internet.


Varifocal Lens

A Varifocal Lens is a camera lens where the focal length can be adjusted by the user. This allows for a flexible field of view. Varifocal cameras are typically more expensive than equivalent fixed lens cameras, where the focal length and field of view is permanently set.

VGA (Cable)

A VGA cable is a 15-pin video cable that is generally used in computer and computer monitors. It is also used by many Security DVR's. A VGA cable carries an analog video signal that requires a conversion from the digital signals used by DVRs and LCD monitors.


VGA (Resolution)

VGA is a video resolution standard that has 640 horizontal pixels and 480 vertical pixels (640x480).


Video Motion Detection

Video Motion Detection is a method of detecting motion by detecting changes in the pixels of a video image. This is the motion detection method commonly used on Security DVR's.



An abbreviation for wireless Internet, which comprises technologies used to wirelessly transmit Internet signals using the 802.11 standard.

Wireless Camera

A camera that transmits video signals wirelessly to a receiver. Wireless cameras require a power source, such as a power adapter or battery.

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Last Updated: 7/9/2012