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Posts Tagged ‘IP networks’

Network Camera Bandwidth Calculator

Tuesday, June 9th, 2009

Network Camera Bandwidth CalculatorJVSG, the Joint Video Surveillance Group, have developed a great software tool which helps you to calculate the bandwidth needed for network CCTV cameras.

This is one of the major concerns expressed (typically by IT Managers) when people suggest adding video cameras to their network.

The software can calculate the bandwidth requirements for cameras with all the common resolution specifications and allows you to calculate the effects of varying resolution, frame rates, numbers of cameras, the video compression standard (H.264, MPEG4, MJPEG) etc.

You can even estimate the impact of varying amounts of motion activity in the scene.

See below for more information on the settable parameters, or click the image above to visit their website.

You can download and run a FREE 45-day evaluation copy of this software from their website, and if you decide to buy it’s just £39 to licence the software for continued use.

 

  • Resolution – Camera resolution in pixels. You can select resolution from the drop-down list. The list contains most popular PAL and NTSC camera resolutions (like 352×288 CIF PAL, 704×576 4 CIF PAL) as well as some typical network cameras resolutions (like 640×480) including megapixel resolutions (1280×1024, 1600×1200), HD and full HD resolutions (1920×1080) as well as others.
  • Compression – Video compression. You can choose from MPEG4, H.264, four levels of Motion JPEG (MJPG) compression (from Low to High) and “RAW Data”. If you use Motion JPEG you can use different JPEG compression levels. If you use low MJPEG compression (level 10) you get best quality of picture and about 10 times lower frame size. If you use Medium MJPEG compression (level 20) you usually obtain a good picture quality and an optimal Quality/Frame Size ratio. With a JPEG level of more than 50 your picture becomes bad for video surveillance purpose.
  • FPS – Frames Per Second. Typical FPS for video surveillance system is from 5 to 15 frames per second. In some applications (like CCTV in casino) it is required to use higher speed values (25-60 FPS). Alternative name for FPS is IPS (Images Per Second).
  • Days – Required length of video archive in days (24 hours). Used for storage space calculation.
  • Cameras – Number of cameras in your CCTV installation with the same parameters.
  • Recording % – Estimated motion recording activity. 100% for constant recording. This parameter is used to calculate disk storage space in case the video is recorded on a schedule or on a motion detector.
  • Image Complexity – Frames from some CCTV cameras are more detailed and have a higher frame size.
  • Motion % – Motion activity (100% for constant activity). This parameter is used for MPEG4 and H.264 bandwidth estimation.

Power Over Ethernet (POE) Explained by Veracity

Tuesday, December 16th, 2008

Power Over Ethernet brings some great additional benefits to the application POE experts Veracityof IP security devices such as network cameras.

Essentially, you can power the camera (or other network device) via the ethernet data cable:

  • a single cost-effective network cable to each device
  • safe low-voltage supply
  • easily extend your network
  • no need for skilled electrical installation labour
  • a single device POE mid-span extension
  • multiple devices via a POE switch
  • the ability to ‘reach’ 100m or more from your existing network
  • 802.3 POE standards allow common solutions for many devices
  • even devices that do not have POE built-in can be used with POE supplies (by use of an Active Splitter at the device end)

We take a lot of calls about the use of POE with IP CCTV and are aware that people find some of the concepts a bit tricky.

Veracity have just produced some really helpful white papers to explain power over ethernet technology and its application:

“Power Without the Struggle” – the benefits of POE technology and how to take full advantage of them …

“POE Explained” – POE concepts through to the latest 802.3at ‘POE Plus’ solutions …

Veracity’s OUTREACH & OUTSOURCE solutions enable you to extend POE beyond 100m.

These new guides from Veracity are written in plain English with helpful graphics and diagrams to aid your understanding. We recommend you take a look.

use-IP Ltd are Authorised Partners of Veracity.

You can find their range of POE products in our POE shop.

Veracity – truly innovative IP network products

Friday, June 20th, 2008

HGHWIRE co-ax converter pair

Veracity manufacture a range of innovative products which enable you to extend your network reach, use Power Over Ethernet (POE), or utilise pre-existing co-axial CCTV cables for IP networking:

CAMSWITCH – a rugged, 4-port, POE, network switch

HIGHWIRE – enables you to utilise existing co-ax cable as a 100Mbit network for cameras or other IP devices

OUTREACH – stretches your network’s reach in 100m steps (with POE) up to 500m

TIMENET– provides an NTP (Network Time Protocol) device on your network to synchronise your devices

OUTSOURCE – is a POE midspan device to inject power onto your network cables for POE supply to IP devices

OUTBREAK – is a POE splitter, which will separate the power and data cables at the device to allow devices that do not have POE functionality built-in to utilise single cable POE supplies

We have now added the full range of Veracity products into our webshop.