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Why we should not connect computers to RG6

Why shouldn't I connect my office 500 feet away to my computers (3) using rg6. I would do this to avoid running cat 5 or 6 or installing a new ISP set up.
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Dave Baldwin
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500ft is a little far to run CAT5/6.  What devices do you have that will use RG6?  If you are going to buy extenders, why not go with fiber which should have better fidelity and speed not to mention immunity from interference?
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The building exists. I am going to have to use the other end for three months while they rehab the office. But, $1000 for comcast installation. There is an existing rg6 cable. I want to hook it to a switch and bring current Internet connection to the temp office. I will also use 3 computers connecting to restaurant computers and video cameras. Do you think it will be too little bandwidth?
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Already know about connectors, used to use coax for networks...but they only ran at 10.
I want to use Wifi - boss wants to use RG6 I am looking for big reason not to do it.
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I am looking for comments about Why it would not be good to use the RG6 already in place
.Speed of data would be limited to the 10 level is the only con I can see. Is there any other reason not to use it...data loss? Anything. I do not need a solution just cons.
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The wireless is an excellent solution...I send a cable signal across a lake for a half mile..works great. The boss want to use an existing Rg6 cable.
Sending a signal across a lake where there is no interference is easy compared to sending thru a building with where every piece of metal interacts with the signal and there are probably other wireless networks in the area.
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I would use external devices. I have two installations working well from city buildings 4 blocks away. That isn't an issue.... I am looking for potential issues using the RG6.
If the cable is good, the only real issue is that you have buy adapters for both ends to use it.  They don't sell network cards that will connect directly to it anymore.
RG6 is fine as well. It takes different media to adapt to a Coax network and may cost a little more. Coax is more water tight and less of a problem to water intrusion than indoor cat5 / cat 6. 10mb/s is not bad for a couple computers. You are putting in a temporary network. So, don't worry as much about trying to get a Gig connection.
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It is currently connected to a switch and the boss is going to connect three computers to it.
The computers will do web work, coonect to the other computers at the restaurant, connect to a reservation system using VNC, bring in three camera feeds, and so far he has had good success with one computer.
The cable is all indoors. I did not think it would work and was looking for reasons to set up something using the wireless.

I set these systems up 3 or four times a year. I set small networks into motion every week.

I thought speed and bandwidth would really be an issue. Why don't we use this stuff more often?
On an original install, coax connectors are a pain and require special tools and are more expensive, much more so than RJ45 8-pin connectors.  And the old coax ethernet cards run at 10Mbps but you can't buy them anymore.  At least I couldn't find any.  The current coax adapters run at 100Mbps and I saw one listed at 270Mbps so those are not the same as the old stuff.  RG6 cable was originally made for radio applications and can be used up to 1GHz if you can accept the losses.  http://en.wikipedia.org/wiki/RG-6
Easiest way just run fiber between location and connect your routers over fiber ports.
You would probably need "yellow" - single mode fiber, which allows  run over long distances.

Here is some cisco chart will help you choose hardware

http://www.cisco.com/en/US/products/hw/modules/ps4999/products_qanda_item09186a0080abed87.shtml

every brand of hardware have their own charts.

http://www.juniper.net/techpubs/en_US/release-independent/junos/topics/reference/specifications/transceiver-m-mx-t-series-oc3-optical-specifications.html?searchid=1358433462178

Once you have cable in place, it will be sufficient to cover any of yours redundancy/HSRP/ else needs.

This of cause will work work if you have this option - run fiber between.