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Wireless Network Overload


 
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btos
Trusted Member


Joined: 20 Oct 2006
Posts: 55
Location: Pensacola, FL

PostPosted: Sun May 06, 2007 4:01 pm    Post subject: Wireless Network Overload Reply with quote

My first wireless camera installation may need 20 wireless ip security cameras- though I'm not sure wireless 802.11g is going to be strong enough to carry so many cameras with video (mpeg4). I've got 8 staic ips and use port forwarding for remote viewing. I've deployed 5 Vivotek cameras on the wireless lan with wan capabilites for 10 users (unicast). The office network is currently installed on the same network and consists of 3 wirelessly connected computers (office needs to be separated on another network I believe). I hard-wired the security monitoring computer directly into a Dlink wbl 2310 router, and performance increased, as all 5 cameras are visible most of the time now. I did cut bandwith with low frame-rates and mpeg4 compression to 64Kbs...Security cams should be dependable and these lan feeds are irregular. A site survey revealed other weak wireless signals in the area and I tried to keep conflicting channels away from them. I put a 500 mw amplifier on the router, with an omni directional 9dbantenna on a 10 foot rpsma pigtail and placed it on a short mast outside of the office trailer (during the construction phase of the hurricane rebuild that is underway)...I've had problems with the network fading out and have been told by Vivotek that the maximum useable cameras for a single ap is probably 5. I can clean up the office by hard-wiring the other 3 computers into the dsl modem (get them off the wireless Dlink)- this should help with reliablilty so I can begin recording events with the 5 camras online now. How to get more cameras deployed is my problem.

I'm having trouble designing the complete network plan. Should I use as many as 4 aps in this overall design plan? Though very difficult because of construction, a better scenario is to run cabling from a camera-to-switch-to-router (for as many of the cameras as possible). For now, if I deploy multiple aps, don't they have to be on separate channels to keep from interferring with each other?

A newly incorporated location, across the street from the main office, has installed a new dsl line and I have purchased an Engenious 3500 bridge/ router - I need to join the 2 networks. This network scenario (building construction was completed) can be deployed with hard-wired cameras that broadcast wirelessly through a camera-to-switch-to-wireless bridge. A similar antenna configuration for the ap/ bridge outside the building is planned. The ap/ bridge is wireless but this model requires hardwiring into the network to transmit wirelessly. Since the device will be on another network across the street from the main surveillance computer/ dvr, do I need to use bridge or access point mode ? I'm thinking bridge...I was advised to use a separate surveillance monitor for the other network. This challenging project is difficult since I'm relatively new to network construction. This site looks like a good one for some advice on planning the completed network. Anything helpful would be welcomed. This whole project has been seat-of-the pants, since my experience is limited...Thanks. Topo of the construction location is visible: http://realpanoramas.com/upload/?folder=content2/Showcase/Cam%20Locations/&configfile=config10.ini
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ICUSecurity
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Joined: 13 Oct 2006
Posts: 328

PostPosted: Sun May 06, 2007 11:02 pm    Post subject: Reply with quote

For starters, i think you need to redo some math..

20 cameras @ 640x480 running at 15fps will consume roughly 25mbps. assuming you are using a wireless G network, this is only 1/2 of what your load can take.

-Chris
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For Sale
32 Aimetis Standard Channel - $90 ea
OR buy with servers (Dell) and save!!

4 Channel Video-Insight Software - $350
8 Channel Video-Insight Capture Card - 1,000
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btos
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Joined: 20 Oct 2006
Posts: 55
Location: Pensacola, FL

PostPosted: Wed May 09, 2007 10:16 am    Post subject: Reply with quote

I'm running half that screen resolution on 5 cameras and have feeds that fade in and out. There's line of sight on all cameras. Vendor says to just hard-wire everything- not the reason I paid extra for wireless cameras!
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ICUSecurity
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Joined: 13 Oct 2006
Posts: 328

PostPosted: Wed May 09, 2007 6:31 pm    Post subject: Reply with quote

Thats simple, wireless cameras suck. No one has a wireles card worth a damn in any of their computers....

This is why the first time I told you to get wireless bridges, and wired cameras.

-Chris
_________________
For Sale
32 Aimetis Standard Channel - $90 ea
OR buy with servers (Dell) and save!!

4 Channel Video-Insight Software - $350
8 Channel Video-Insight Capture Card - 1,000
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btos
Trusted Member


Joined: 20 Oct 2006
Posts: 55
Location: Pensacola, FL

PostPosted: Thu May 10, 2007 10:22 am    Post subject: Reply with quote

It was just a little hard for me to believe that all these comanies that advertised wireless cameras ranges and abilities were exaggerating to the point of lying. Sales isn't concerned with facts, just sales. For my client, construction dictated wireless applications and now I have no idea who knows what they are talking about anymore. I'm faced with a lot of networking issues that are very difficult to solve and there's no help availalbe, other than vendors who want to sell me new equipmennt for redoing the network with a wired solution. That's the truth about what wireless is all about from my vantage point. Truth is, I don't know who to believe.
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ICUSecurity
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Joined: 13 Oct 2006
Posts: 328

PostPosted: Thu May 10, 2007 5:16 pm    Post subject: Reply with quote

We were a wireless company FIRST, a security company SECOND....

Before you even took on this project I gave you step by step solutions on how to solve a wireless issue, at a reasonable price.

I explained that wireless companies in the IP-camera world are charging a premium for junk wireless equipment. My SR9's are running $225 (to resellers) that have the SAME EXACT wireless chip as well known "Wireless IP-camera" network bridge. As a matter-a-fact they don't even realize it, but they are buying their chips from us. And marking them up to $1500.

My advice up front was simple, for your first project buy everything from someone who will configure it before they ship it to you. Yea, you would of paid 25-30$ more per camera, and another 15-25 more per bridge. But look at the time, headache, and hassle you would of saved.

My advice to you would be, at this point post a list of exactly what you have. If it is usable equipment, I may have a few installers that would be willing to swap out equipment with you. I have a few guys working on short range wireless (25 feet) that could use the 4dBi antenna on most cards...

-Chris
_________________
For Sale
32 Aimetis Standard Channel - $90 ea
OR buy with servers (Dell) and save!!

4 Channel Video-Insight Software - $350
8 Channel Video-Insight Capture Card - 1,000
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