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Table of Contents



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Table below shows the maximum number of remote surveillance cameras as a function of the throughput capacity of various communication links. The frame rate of the image flow (reference format is PAL) for calculation purposes was accepted as equal to 1 frame per second.

Info
titleNote.

In real conditions, the fluctuations of camera streams can be quite significant, depending on the scene illumination, the use of day/night mode, how much motion there is in the frame. To accurately calculate the required network bandwidth, it is necessary to measure the stream from cameras that are already installed on the secured siteprotected facility.


Communication mode

Link capacity

Black and white image

Color image



standard

high

full

standard

high

full

Dial-Up

56 Kb/sec

<1*

<1*

<1*

<1*

<1*

<1*

ADSL, Ethernet

128 Kb/sec

1

<1*

<1*

<1*

<1*

<1*

ADSL, Ethernet

256 Kb/sec

2

1

1

1

1

<1*

ADSL, Ethernet

512 Kb/sec

4

3

2

3

3

2

ADSL, Ethernet

1 Mb/sec

7

5

4

6

5

4

ADSL, Ethernet

1.5 Mb/sec

11

8

6

10

8

6

Ethernet

2 Mb/sec

14

11

8

13

10

8

Ethernet

10 Mb/sec

71

53

39

64

51

38

Ethernet

100 Mb/sec

711

533

388

640

512

376

Ethernet

1 Gb/sec

7282

5461

3972

6554

5243

3855

...

Example: To transmit live video, a 100 Mb/sec network should be used (25 frame/sec – PAL), video image – color; frame resolution – standard. As the table shows, the Mb/sec link can transmit the image flow at a rate of 1f/sec, specified color grade and resolution from max. 640 surveillance cameras. Consequently, if the image flow rate is 25 frames per second, the maximum number of cameras will decrease by 25 times and will be equal to: 640/25=25 cameras.

Info
titleNote.
More often than not, video signal processing, transfer and recording requirements take up only a small proportion of the digital video surveillance system resources. While calculating performance of the video surveillance system, the proportion of resources, consumed by audio monitoring, may be neglected.

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