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Video Surveillance – the D-Link jargon buster

Video Surveillance –

the D-Link jargon buster

Not sure what all the terms mean? Here’s a short guide to help

understand the D-Link products and services discussed in this guide.

Built-in IR

Infrared (IR) illuminators emit invisible

light, enabling you to monitor an area

in complete darkness.

Digital Encoder

A device to convert analogue video

signals to digital format and transmit

them over an IP network. Used to enable

analogue CCTV cameras to be integrated

into an Video Surveillance system.

Digital input/output (DI/DO)

Standard interfaces that enable a camera

to communicate with external sensors

(e.g. door and window sensors) and

alarm systems.

High Denition (HD) video

HD cameras capture a lot more

detail and are also able to cover a much

wider area than a standard VGA camera,

giving good surveillance coverage with

fewer cameras.

Infrared Cut Filter

A ﬁlter that can block infrared while still

passing visible light. Usually removable

(either manually or under software

control) to enhance daytime images

while also allowing the camera to be

used at night.

Megapixel

A generic term for cameras able to record

at high resolution, i.e. above a million

pixels. Analogue cameras are limited to

around 0.4 Megapixels whereas digital

network cameras can capture images in

much higher detail with 2 Megapixels

and above.

Multicasting

The ability to send video to multiple

monitoring and recording stations with

a single stream, saving bandwidth and

reducing network traﬃc.

P-iris

P-Iris is a precise iris control, that

optimises the iris opening of the lens

under all lighting conditions resulting

in images with better contrast, clarity,

resolution and depth of ﬁeld. It provides

improved image sharpness and

increased image usability.

Network Video Recorder (NVR)

An appliance or application designed to

manage and record video streams from

Network Surveillance cameras. These

will, typically, record to hard disk with

optional copying to other media such as

recordable DVD and the cloud.

Onboard SD Recording

The ability to record to media in the

camera itself, such as ﬂash memory or

removable SD card. Particularly useful for

remote sites with no network, Wi-Fi or 3G

connectivity and as a backup in case of a

network failure.

Open Network Video Interface

Forum (ONVIF)

An open industry forum, of which D-Link

is a member, for the development of a

global standard for interfacing IP-based

physical security products.

Pan, Tilt, Zoom (PTZ)

The ability to remotely control a camera

to pan (move from side to side), tilt

(move up and down) and zoom in on a

particular area of interest.

Passive Infrared (PIR)

PIR sensors measure infrared (IR) radiation

from objects in its ﬁeld of view. Used to

detect movement.

Power over Ethernet (PoE)

The ability to transmit power to a

remote network camera over the data

network. This eliminates the need for

an independent main power supply

and an AC adapter that might fail or

be unplugged. With PoE a central

Uninterruptible Power Supply (UPS) will

also keep the cameras working in the

event of a power cut.

Quality of Service (QoS)

On a shared network, bottlenecks can

arise when surveillance video has to

compete for bandwidth with data, voice

and other traﬃc. QoS technology allows

traﬃc to be prioritised, but needs to be

implemented across the whole network,

in switches and routers, as well as

Network Surveillance cameras.

Video Streaming

Encoding of captured video for

transmission over a data network. A

number of encoding and compression

technologies can be applied here, the