Relative Analysis of GSM, CDMA and Wireless
Hi,
Sometime back myself and friend were discussing about the wireless, when we were travelling back home and seeing the cops speaking on wireless phones. It was totally inaudible with so much noise. My friend was saying that wireless phone is very cheap but very insecure. CDMA phones are very costly but very secure too. GSMs scale up in between them.
I am quite interested in finding out where can be find more information in analysis of the same -- cost wise, infrastructual investment, security etc. I was searching out for fundamental info but could'nt locate one.
Please help.
Sometime back myself and friend were discussing about the wireless, when we were travelling back home and seeing the cops speaking on wireless phones. It was totally inaudible with so much noise. My friend was saying that wireless phone is very cheap but very insecure. CDMA phones are very costly but very secure too. GSMs scale up in between them.
I am quite interested in finding out where can be find more information in analysis of the same -- cost wise, infrastructual investment, security etc. I was searching out for fundamental info but could'nt locate one.
Please help.
ASKER
But how does these differ from Wireless phones that cops normally use? There seems to be alot of noise in those wireless phones? Are these private spectrum?
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>The up-side of using radios over phones is simply push to talk (no need to know or select the number for a particular unit), broadcast to all units, and no need to rely on a telecomm co for service.
This is only true in the old style fm system that you refered to in the begining of your post.
That is why I added my sentence about the industry falicies. In most metro areas in the US, the publice service folks use trunking radios, which means that every conversation goes through the main system (towers similar to cell towers) and that officiers (and fire fighters etc) can die because the radios can get a "busy signal" or may not be able to communicate with other radios because of technical issues which do not exist with simple fm 2 way radios.....
There were reports of communications failures of the trunking system in NYC during the world Trade Center disaster. Most of the failures were because of the complicated communication system which would be fine for taxi cabs or busses, but is horrible for emergency commuunications.
This is only true in the old style fm system that you refered to in the begining of your post.
That is why I added my sentence about the industry falicies. In most metro areas in the US, the publice service folks use trunking radios, which means that every conversation goes through the main system (towers similar to cell towers) and that officiers (and fire fighters etc) can die because the radios can get a "busy signal" or may not be able to communicate with other radios because of technical issues which do not exist with simple fm 2 way radios.....
There were reports of communications failures of the trunking system in NYC during the world Trade Center disaster. Most of the failures were because of the complicated communication system which would be fine for taxi cabs or busses, but is horrible for emergency commuunications.
Arthurjb,
I can't say I disagree on the issues with digital and trunking radio systems. However, conventional systems also have their issues, as anyone who's had to wait on another to finish their verbose message to get through on a conventional system can attest. The best hybrid systems these days allow conventional and simplex operations as well as fully-trunked communications on a single unit - not that complexity isn't an issue, as you say, but a large metro area like NYC simply could not have enough frequencies to operate on a conventional system.
You hadn't posted yet when I started writing my original post, we clearly are saying similar things. :)
I can't say I disagree on the issues with digital and trunking radio systems. However, conventional systems also have their issues, as anyone who's had to wait on another to finish their verbose message to get through on a conventional system can attest. The best hybrid systems these days allow conventional and simplex operations as well as fully-trunked communications on a single unit - not that complexity isn't an issue, as you say, but a large metro area like NYC simply could not have enough frequencies to operate on a conventional system.
You hadn't posted yet when I started writing my original post, we clearly are saying similar things. :)
http://www.wisegeek.com/what-is-the-difference-between-gsm-and-cdma.htm