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using TV CABLE FOR ETHERNET LAN ??

Posted on 2001-08-16
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Last Modified: 2008-03-10
i have lots of tv cable lying around the house...can i use it to connect my network instead of buying new ethernet cable 10base5 or whatever. arnt they both the same. i read something about it having 75 ohm resistances instead of 50 (im using bnc / terminaters instead of utp cable) . anybody offer any help ?

thanks in advance...
vikky999
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Question by:vikky999
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9 Comments
 
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Expert Comment

by:gibsonpd3620
ID: 6394191
RG 58 cable has 50 ohms resistance.  RG 59 cable has 75 ohms resistance.  Coax used for cable TV is usually RG 58.  You can use the cable you mentioned if it is RG 58.  It is better if you have to use coax if it is solid core instead of stranded.

gibsonpd3620
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by:cfarca
ID: 6394639
Yes you can use it without problems. Don't forget to install 50OHM terminators at the both ends of the cable.
I was using this solution for about a year without any problems. the maximum light is 100 meters(250feets).
Regards, Chris.
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Expert Comment

by:lrmoore
ID: 6395257
I agree, you can use your TV cable with the proper 50Ohm terminators and T connectors for short runs, but you won't be guaranteed the full 185Meters of true RG-58. Cfarca is right that you don't want to count on much more than half that distance.
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Author Comment

by:vikky999
ID: 6396029
thanks...i intend to try it tomorrow. but if i dont know whether the cable is rg58 or rg59..how can i find that out using a multimeter ?? also i have been seeing another weird effect on a different coax cable. the tv cable wire which i connect to my tv passes about 4 feet away from another tv which is not used in my house.despite the fact that its not connected to the other tv i get perfect reception even though the tv cable wire is 4 feet away from the video in jack.

i thought coax cables are very well shielded ..how can it leak so much radiation ?? anybody offer me any links on how coax cabling works ??

thanks
vikky
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Expert Comment

by:ocon827679
ID: 6396820
A multimeter won't tell you anything.  The type of cable is generally stamped on the cable.  The impedence of the cable, whether it is 50 or 75 ohm, is determined by the design, ie, size of the condutor, shield and dialectric.  The cable is terminated (on both ends) with a resistor that matches the impedence of the cable.  As far as your tv is concerned, it sounds like you have an open end of the cable near the tv.  If the conductor is protruding from the shield, which it does on the end, and the end is not terminated, you basically have a transmission antenna (just like a radio or tv station).      
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Author Comment

by:vikky999
ID: 6400390
well ok. one last question ... the tv cable goes into the jack which goes in the tv. however slight movement of the cable causes a great deal of disturbance...what is the proper method the connect the cable into the jack. only the main wire (central wire) goes in...what do i do about the nettype surrounding thin wires ???
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by:gibsonpd3620
ID: 6400934
vikky999

Coax cable can be very fragile.  If you are using crimped on connectors they will give you trouble as time goes by.  What you describe sound like crimped connectors.  The best way to use coax is to sodier the coax ends on the cable.  Tenbase2 networks are a real pain.  If one connector becomes loose it will take down the entire network.

gibsonpd3620
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lrmoore earned 300 total points
ID: 6400967
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Author Comment

by:vikky999
ID: 6403122
thanks everybody...dont know how to distribute points
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