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help on cabling
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| nbcd |
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Posts: 1
Joined: 13 Mar 2008
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Posted: Thu Mar 13, 2008 3:55 pm
Post subject: help on cabling
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hy all ,
I am a newbie in cctv. I've just finished my first project in a factory with a Samsung SDN 550 camera , 520 , and 6 i vision dome cameras and a 3S Systems DVR. Although the client accepted the project , i'm not satisfied at all about the results. I observed that the images were not so clear as i expected and the path zones between a light object and a dark one were not clear.
Anyway.. i wanted to ask you if the shielding from an utp cable must be connected to a ground or something.. Somewhere in this project i had to run a 180 meter utp cable to link the DVR video out with an LCD that was placed in another building , so i used tho baluns from GE security(passive) . I observed that if the shield isn't connected to the ground there are some lines that are over the image (hum,noise) but if i connect the shield to the DVR's case those lines dissapear but the image is distorted in the upper 1-2 centimeters of the screen. (something like little waves) .
Please let me know from your experience what should be done with the shields of the cables,what i have done wrong? What is better to be used UTP or coaxial? and which is the maximum cable length for the coaxial RG59 ?
I will appreciate if you paste a link about ground loops , that i don't know anything about.
With respect.
Eugen.
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| wattwire |
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Posts: 4
Joined: 14 Feb 2008
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Posted: Wed Apr 09, 2008 4:32 pm
Post subject: Re: help on cabling
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<<i wanted to ask you if the shielding from an utp cable must be connected to a ground or something..>>
The "u" in utp stands for unshielded. There is a casing, but it is not a conductor. So the answer is "no", connection to the baluns is all you need.
-dw
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| survtech |
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Posts: 641
Joined: 21 Mar 2007
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Posted: Wed Apr 09, 2008 5:45 pm
Post subject: Re: help on cabling
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| nbcd wrote: |
| Anyway.. i wanted to ask you if the shielding from an utp cable must be connected to a ground or something.. Somewhere in this project i had to run a 180 meter utp cable to link the DVR video out with an LCD that was placed in another building , so i used tho baluns from GE security(passive) . I observed that if the shield isn't connected to the ground there are some lines that are over the image (hum,noise) but if i connect the shield to the DVR's case those lines dissapear but the image is distorted in the upper 1-2 centimeters of the screen. (something like little waves) . |
What shielding? If you are using utp, there should be no shielding; just 4 pairs of twisted cable. Attach a balun to the same pair at each end using the same colors at the baluns' (+) and (-) connections and you should be good to go. You should not use other cable types (ie. shielded pair) or other cable sizes other than CAT-5, CAT-5e or CAT-6.
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