Go to documentation repository
Documentation for Intellect 4.11.0-4.11.3. Documentation for other versions of Intellect is available too.
Previous page Next page
On the page:
Requirements for TCP/IP Network bandwidth for video signal transferring
Throughput capacity of the network refers to the factors restricting performance of the distributed network. Data exchange flow is primarily made up of image data. For instance, where surveillance cameras are used to monitor remote objects, likes ATMs, the data flow (image flow) is transmitted over communication links.
In order to calculate the required bandwidth of TCP/IP network for video transmission from IP devices and some video capture cards, it is recommended to use the Axxon platform calculator, available here (the Summary stream from ip devices (Mbit/s) parameter). For video capture cards that are not supported by the platform calculator, use the calculation data below.
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.
Note.
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 site.
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 |
*max. one surveillance camera, provided that maximum compression and/or image flow gapping is supported.
To calculate the maximum number of remote cameras transmitting image flow to the network with a rate over 1 f/sec, the corresponding value shown in the table should be divided by the number of frames.
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.
Note.
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.
Requirements for TCP/IP network working of database synchronization functionality
If the Intellect software operates in the distributed environment where several Servers and/or Remote Admin Workstations are combined the Configuration databases synchronization is performing (see section).
The fulfilling of following minimal requirements for network is needed for correct synchronization of Configuration databases:
- Minimal speed of data transferring by link channel (capacity) is 64 kbit/sec.
- Maximal delay while packet transferring is 500 milliseconds.
With more badly parameters value the correct operation of databases synchronization functionality is not guaranteed.
Overview
Content Tools