Jargon Buster


Alarm Receiving Centre (ARC)

When you have an intruder, there’s no point in having an alarm unless you can be confident that someone is instantly aware and ready to act. That’s why we have our own dedicated Alarm Receiving Centre – to monitor remote alarms. We are there to help 24 hours a day. And that goes all the way – right down to checking that the battery is properly charged. The moment an alarm is sounded, one of our trained operators takes over, calling keyholders or the police, whichever is appropriate.


Bell box

The distinctive Texecom bell box is an external sounder which has a self contained high output two tone sounder incorporating a strobe light for visual indication. All electronic components are contained within a secure fully tamper proof enclosure.

BLC (Back Light Compensation)

If there is a bright backlight, the subject in front of the backlight appears silhouetted or dark. Enabling the BLC function can correct the exposure of the subject but the backlight environment is washed out to white.

BNC (British Naval Connector)

This type of connector is used to connect the video from Analogue CCTV cameras.

Break glass detectors

Break glass detectors are fitted over or next to shop fronts or other vulnerable glazing. They detect the sound of breaking glass, together with the accompanying change in air pressure.


Confirmed light

This is a light programmed to come on as soon as any secondary detection device is triggered. Although not a strict DD:243 requirement, it does help overcome potential health and safety issues.
Once a keyholder is called to attend the premises after one detection device has been triggered, it is reassuring to know that a warning light will let them know if a second device has been triggered, suggesting that an intruder is inside


DNR (Dynamic Noise Reduction)

Reduces the noise introduced by transmission of signals, if any is present.

DNS (Domain Name Server)

IP address of Internet Service Provider.

DVR (Digital Video Recorder) Analogue

This is where your Analogue cameras are recorded and controlled.


This device is another form of dual path signalling. A Paknet radio transceiver transmits the alarm signals and a digital communicator gives warning if there are radio signal problems.

Digital communicator

Digital communicators work a bit like a computer modem. They transmit basic data, such as an alarm from the protected premises. They won’t notify the ARC if the phone line has been cut and can’t send a signal if the line is engaged. They are most commonly used for smaller residential systems.

 DD:243 (Police guidelines)

DD:243 are guidelines introduced to help alleviate false alarms; reducing police time wasted in attending sub-standard and problematic systems. The guidelines outline that alarmed areas need to be covered by two or more detector devices using different technologies (see Detection Devices). Only if the second detector is activated within 30 minutes after the first device will the police respond. Single alarm activation alerts the ARC who notifies the keyholder.

Dual technology movement detectors

These detectors combine infra red and microwave detection technologies and both have to be activated to cause an alarm.


EIS (Electronic Image Stabilization)

If the live view image should move slightly or dim when the camera is shocked slightly, the electronic image stabilization function is used to overcome these problems and keep a clear and steady image.


FPS (Frames Per Second or Frame Rate)

Our eyes view between 10-12 frames per second; DVR’s and NVR’s are capable of much higher. Setting a high frame rate will use valuable space on the HDD.

FTP (File Transfer Protocol)

Used for sending video to servers.


GUI (Graphical User Interface)

The Graphical User Interface is the menus and submenus within the camera or DVR/NVR where changes can be made. This is where you access product features and make changes to the IP scheme.




HD-CVI (High Definition Composite Video Interface)

This technology allows you to send high definition video signals up to 500m using co-axial cabling at IP quality. It is not directly compatible with analogue or IP equipment.

HLC (High Light Compensation)

HLC enables the camera to identify and suppress the strong light sources that usually flare across a scene. This makes it possible to see the detail of the image that would normally be hidden.


IP (Internet Protocol)

An Internet Protocol address (also known as an IP address, IP or IPA) is a numerical label assigned to each device (e.g., computer, printer, camera) participating in a computer network that uses the Internet for communication.

IP Rating (Ingress Protection)

Any IP Rating 64 and above is considered outdoor use.
IP64 Protected against water splashing from any angle.
IP65 Protected against water jets from any angle.
IP66 Protected against powerful water jets and heavy seas.
IP67 Protected against the effects of temporary submersion in water.

Infra red beams

A transmitter projects an infra red light beam to a receiver unit. Interrupting the beam triggers an alarm. In hostile environments, dual or twin beam units are used, where both beams have to be interrupted. They can be used inside or outside.


Magnetic reed contacts

These devices use magnets fitted to doors. When the door is closed, two metal strips secured within a glass phial come together, completing a circuit. Once the door is opened, the circuit is broken, activating the alarm. There are four types:
Flush contacts are fitted inside the door frame and are invisible when the door is closed. Surface contacts are housed in PVC boxes and are generally used for external doors. Heavy duty contacts are as surface, housed in metal boxes with stronger magnets. They are generally used for ill fitting doors. Shutter contacts are fitted to the floor and are generally used for roller shutters and metal sliding gates.




NAT (Network Address Translation)

Used for Port Mapping.

NSC (Notify Surveillance Centre)

When an alarm is triggered the NVR will notify the surveillance centre who will take the appropriate action.

NVR (Network Video Recorder) IP

This is where your IP cameras are recorded and controlled.


ONVIF (The Open Network Video Interface Forum)

The ONVIF specification will ensure interoperability between network video products regardless of manufacturer. This compliance ensures better options for end users.

OSD (On Screen Display)

Displays camera name or number, date and time etc.


PPPoE (Point-to-Point over Ethernet)

If you have no router but only a modem, you can use Point-to-Point Protocol over Ethernet (PPPoE) function.

Passive infra red movement detectors (PIR)

For domestic and office applications, we normally employs wide-angle ‘quad zone logic detectors’. These are intelligent devices that provide very stable detection, recognising the difference, for example, between humans and rodents. Electronic chips process the information even further to filter out false alarms.

Personal attack buttons (PA)

These units employ two buttons, which have to be pressed at the same time to activate an alarm. They work around the clock and can sound an audible alarm, or can silently alert a receiving centre. We are experts in all combinations of security measures and can tailor a solution that is exactly right for you, please contact us.

PoE (Power over Ethernet)

Used to power IP cameras over Cat5/Cat6 cabling.



ROI (Region of Interest)

Select quality of image in certain areas of display, a ROI will have a better image quality.


Vibration detectors

These are normally fitted to door or window frames and are designed to detect high and low frequency vibration within a range. They can be adjusted to suit local conditions.


UPnP (Universal Plug and Play)

Network architecture that provides compatibility among network equipment, software and other hardware.


WDR (Wide Dynamic Range)

The Wide Dynamic Range function helps the camera provide clear images even under back light circumstances. When there are both very bright and very dark areas simultaneously in the field of view, WDR balances the brightness.


0800 612 6933