Wireless City Surveillance

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Permalink Reply by Gary Lahti on March 9, 2010 at 10:24pm

That is a heavy load on any network let alone for something wireless, a ton of data for the pipe.

All depends on the backbone and how much data it can handle ... spend enough, put enough infrastructure out there and your performance improves.

In any standard surveillance application a handful of frames per second are enough to keep an eye on things. The higher the sensitivity or risk, the more imagery you need.

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Permalink Reply by Sanjay Kr.Chatterjee on March 9, 2010 at 10:38pm

Thx. Gary for the info, but tell me something on a wide area network would Wi Max be a better solution? though the throughput is around 10mbps, but i think it still would work better than wi-fi. Actually when clients stick to wireless solutions it becomes quite a task, as you said the fat pipe gets choked up. but laying down OFC is tedious and time consuming too. So what technology backbone would you suggest for a city surveillance project of 500 camera's of which 300 odd would be PTZ's with atleast 35x.

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Permalink Reply by Sanjay Kr.Chatterjee on March 9, 2010 at 10:49pm

"Azalea has Super AG technology (WIFI) that is why they claim up to 74 Mbps throughput over 108 Mbps( With super AG) Bandwidth , Problem is that , Super AG Technology Uses 40 MHz Channel bandwidth & particular for this reason the radio device depends on pure LOS . If there is any obstruction between radio path even 10%, then during that period there would be no communication established .
The answer to the above was Azalea router unitizes multiple LOC to overcome this issue.which i am honestly not sure of .

Azalea radio device is dual band ( 2.4GHz & 5.8 GHz) . They establish radio communications by two frequency or two channels together By link aggregation method . For this reason azalea radio apparently provides more throughput . The Disadvantage is if one frequency or channel is down then, at that moment the radio would provide low through put . This i guess is the so called RADIO BUNDLING .
AND
Radio building is used to backup to primary frequencies,
The Conclusion is that,Azalea radio device is purely wifi standard device & as we know that wifi communications is half duplex , this technology cannot support purely simultaneously traffic access like DVV (Data , Voice & Video) ." Azalea or any other technology highly depends on off load ding traffic at statically placed back-haul and capacity injection services such as fibre and other technologies available in the area.

ANYONE WITH A BETTER SOLUTION PLEASE SUGGEST AND GUIDE ME THROUGH.

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Permalink Reply by Stratign FZCO on March 10, 2010 at 9:48am

Hello Mr. Sanjay ..
We are Dubai Based Digital Communication Monitoring and Surveillance Solutions Provider ,We Provide many Products like Monitoring System such as Satellite Monitoring,GSM MONITORING ,Iridium,Thoraya System,Encrypter Jammer System and Signal Analysis System..
for more details you can this site , may be it will help you...
http://www.stratign.com

Thanks
StratignFZCO

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Permalink Reply by Ashok Bhat on March 10, 2010 at 10:55am

While on this issue of City Surveillance on Wireless Backbone, can you please confirm the Bandwidth reqd for a 4 CIF resolution coverage with 2000 Kbps using a PTZ camera.

Thanks.

ASHOK

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Permalink Reply by Sanjay Kr.Chatterjee on March 10, 2010 at 2:21pm

Dear Ashok,

what is your priority? Image quality or frame rate?

Ans: if its the image quality please reduce the frame rate to 10 FPS or below, and if it is frame rate then reduce the image size to 2CIF or below.

The bandwidth required for 4CIF with the video format of MJPG or MPEG4 should be 4 MBPS( Dedicated) or above.

If the camera transmits H.264, then the calculations would definitely differ.

Regards,

Sanjay

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Permalink Reply by Ashok Bhat on March 10, 2010 at 3:27pm

Hello Sanjay,

Thanks for your reply. Here the application is for both viewing and recording simulatenously and they want the images in 4 CIF resolutioin format with a 2000 KBPS bit rate and 30 frames per second.

Can you pls forward me a method to calculate the Bandwidth and size the network for this.

best regards

ASHOK

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Permalink Reply by Sanjay Kr.Chatterjee on March 11, 2010 at 2:57pm

Hello Ashok,

Glad to hear from you. As for the calculation method, i can send that to you, for which i need your email id to send the details as an attachment. and trust me there would be no looking back after that.

As for your application is concerned, i don't think this is quite possibly, quality of performance wise. but what would be the video format for this application?

Regards,

Sanjay

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Permalink Reply by Sanjay Kr.Chatterjee on March 12, 2010 at 2:43pm

Dear Ashok,

As discussed, your need for a calculator, please find this very hand option thx. to AXIS group

http://www.axis.com/products/video/design_tool/index.htm?err=browser

And its very user friendly too, so you definitely owe me a cup of coffee whenever we meet.

Take care Ashok, let me know your next line of interests, I'd love to be around helping you out.

Regards,

Sanjay

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Permalink Reply by Ashok Bhat on March 10, 2010 at 10:55am

While on this issue of City Surveillance on Wireless Backbone, can you please confirm the Bandwidth reqd for a 4 CIF resolution coverage with 2000 Kbps using a PTZ camera.

Thanks.

ASHOK

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Permalink Reply by Ascendent Technology Group on May 13, 2010 at 1:55am

You can get up to 300MPS with wireless now from a few companies including Motorola

They also have wireless optical which is shorter range but can give speeds up to 4GB.

But I suggest wired when ever possible and if it is a PTZ camera use analog as IP and wireless has way to much lag to manually operate PTZ camera.

Ascendent manufactures PTZ cameras with up to 1500mm lens for city application as you can cover large areas with one PTZ if you are using fixed cameras as reference points.

http://www.ascendentgroup.com/

Attachments:

• Long Range IR Products Ascendent.pdf, 875 KB
• Long Range PTZ Camera 1500mm lens AscendentObserve-1500-HD.pdf, 1.2 MB

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