STP vs UTP for Surveillance

Author: Brian Rhodes, Published on Aug 06, 2012

For many, deciding which ethernet cabling to use is a quick decision: install whatever is cheapest. However this may grossly simplify an important decision: Does the cable, and the video it carries, need extra protection against interference? Is the difference between cable types that significant? In this note, we examine shielded cable, look at how it can prevent video problems, and compare it to unshielded alternatives.

Electrical Interference: Video Killer

** *** ***** ************ *****, *** ******** ** ***** ** cameras *** ****, **** ****** ********* ** *** ******* ** between. **** ***** ******* ******** *****, ** *** ** * frustrating ******** ** **** ****** *** ***** ********, **** ** discover ******** *** ***** *******. *******, ****** * **** **** at ******* *** ******* ********* ******. **** *** ******* ** the ***** *****:

********** ************ ** *** ******* ****** ***** **** **** ** problem. *** **** **** *** ***** ******** ******** **** *******, but ** **** *** ******* *** ******** ********* '*****'. * jacketed ***** *** ***** ** ** '**-*** *******' ***** ********* why ***** ********* ** ********* ********.

*** ***** ****: "***'** **** ** ****** ** **** ******* link." **** ********* ******* ** ***** ********, ***** *** *********** of *****-***** ******* *** ***** ********* *** ** ****** ** shoddy ******* ******. ** *** ********* *******, ** **** * look ** ******** ******* ****, ** '***' ****** ********** ******* Pair, ** ***, *** ******** ***** ***********.

********

* ***** ******** ********** ******* *** *** ***, ** '********** twisted ****' ******* ******* *** ******* ***********. *** ***** ****** the ********** ******** ********* *********** **** ***** ** ***:

'*********' ****** *** ** ******** **** '***** *********' ***** * single ***** ** ******** **** ** **** ****** *** ****** bundle ** *****. ***** *** ******** ** ************ **** ***** versus ***** **** *** ****** ****** ****** **** ** *** same ********, **** *** *** ********** ** *** ***** *** result ** ********* ***********.

*** ****** ************ *** ******** ******* **** *****, '***', ** sometimes ***** ** '*/***' ** '**********/****-******** ******* ****'. ** ******* standards ******* *** *** ******* **** ****, ******* ******** ******* to ****-*** **** ****** ************ **** ****** ******* ** *** nomenclature. *******, *** **** ************ ***** ************ '***' ** **** widely ****.

Physical ***********:*** ********* **** ********** *** ******** *********** ******* *** *** STP.

  • ******** **** ******:* **** ***** ** ****, ******** ********, ********* **** *****. This ***** ** ***** ****** *** '*****', *** **** ** properly **********. ******* ** ********** ****** *** ***** *** ******* the ******** **** *** ******** ** ********.
  • ******* ******:*** ***** ****** ** **** ******** *** ****** *** ******** to *** ***** ******. ** * ******, * ******* ******* insulating ****** ** ******, ***** **** ********. *******, *** ** heavier *** ******* ******** ** ***, *** *** ** **** difficult ** ******* ** * ******.
  • *****, **** ******, *** ***********:********* ** *** ***** ************ *** ***** ** ***, ***** features *** ** ******* *** ******** ***** ** *** *******. This ******** ******* ******* '****' ******, ******* ** *** ********* the ******, *** ********** ********** ********* *****. ***** ** ** ******* rated ***** **** * ****** **** **** ********* *** ***** into ********* ****** *** ******.

Image result for network cable core

Functional ***********: Those additional physical features provide STP with properties that UTP does not possess.

  • *** **********:*** ******* ********* ** ********* ** ********** **** **************************** ************, ** ***. ******* **** **** ** ************ *******, *** ability *** ******* ************ ** ******** *** ***** **** *** cable ** ************* ********* ** **********.
  • ******** **** *****: ************ *** ** * '***-*** ******' ** **** ********** cabling ** * ****** ****** ** ************. ** **** ************, like ********* ******* ******* ** *************, ****** ******** ******* *** be * ************ ******* *** ************. *****, *** ******** ** pair ********* ********* ** ********** **** *******.
  • ****** ************ *****: **** ******* ******* **** *** ********* ** ***** ********* the ********* ************ ** ******** *******. *******, ***** ****** ****** be *** **** **** *******. *** ***** *********** ** ************ rate *** ****** **** ***** ** *** ******* '********' ** cable ***** ****** *********** ****** **** *** ********* ** ***. In *** ****, *** ********** ******** ** ************ ****** **** also ** ********* ** *** *********** **********. ************ ****** *** only ** **** ** ***** ** *** * ************ *** rated, ***** ********* *** ****** ** **** *****.

Cost **********

***** *** **** ******* $** ** $** *** ****** ******** to *** *******, ******** ***** **** ** *** ****, ***** on *** ***** ***** ~**% **** **** *** *** ********* on *** **** ********** ***** ** ****** ******* ** ****** for *** ******, ******* *** **** ***** ***.

Where ****** *** ** ****?

*** ****** ******: ******** ************ ***** ** * *******. ***** that ***** ** ****** ******, **** *** **** ****** ******* of ************ **** ****** ******* *****:

  • ******** ** **** ******* ******:***** ****** *** ********* **** **** ************ **** **** *** parallel ** **** *****. **** ****** *** * ********* ******** apart ****** * ******** ******* *** ** * ****** ** video ************. ***** ** **** ************* ****** *** **** ** use *** ** **** ********* *** *****, **** ********* ** data ********** ****** ****** **** *** **** ******* ******* *** same *******, ********** ** *** ** ** ********* ***** ** *******, **** ** *** ***** *** *****.
  • **** ********* *******:**** ******* *** **** ****** ***************** ******** **** ******** ******, power ************, ******** *****, ** ********* *** ********* *********** ***. These ******* *** ************* ** ***** '*********' **********, ** ***** ******** ** ******** ****** *** *********. Devices **** **** *********, *********** ****, **** ********, ********** **********, and ********** ********* *** ******** ****** ************ ** ******* ***** quality.
  • *** *******/****** *******:****** *** ******* ************* ****** ******* **** ************. ***** * token ******* *** *** ** *********** ****** ** ** * problem, ******** **** **** **** **** ******* ********* ** ************ should ** *** ***** *** ** ********* ********.
  • *********** ***** ********:*** ** *** ******* ******* ** *** *** ***** ****** light ********. ***** *** ****** ********** ** ******** ****** ******* directly ******** ** ***** ******** ** ******** **** ********, ** cabling ****** ** *** ** ****** ***** *****, ** ****** be *** ***** *** *****.

Practical ***

** *** **********, *** **** ******** ** *** ************ ******** cabling *** **** *** ***** ***, *** ** **** ** significant ****** ** ******. ***** ********** ******** **** *********** ****** is ************ ************ ** ********** *** ********** ****** "**** *********", ** ** **** *********** ** ******* ** ***** ******* design?

STP *********?

******** ***** **** ************** ******** ******** *** ** *** ********* for ******* ******* *** *** ********* **********:

"*** ************** ** ** ****** ** *** ******* ***** ** demanding ********** ************. ******** ** ********* ****** ************ *** ***** the ******* ***** ** ******* ** ******** **** ********** ***** supply ****** ** ***** ***** ********* ***** **** ** ****** or ********** *** ** ***** ******** ** *** ****** ** its *****.It ** **** ********* to use an STP cable where the camera is used outdoors or where the network cable is routed outdoors."

**** ** * **** ********* ***** ****~**% ** *** ******* *** ********* *******. ********* ****' ************** *** *** ***** * *********** ******** ** overall ******* **** *** ** ** ****** ******** ******** ** common ******** *****.

******, *** ********** ********* **** *** *********** *********** ** ***.  The ******** *** ** *** ** ***** ******** ** *** in *** '**** ****' ***** ********** *****, ** ***** *****-********* switches *** ******** ******* ** *** ********.

Test **** *********

***** **** ** **** * * ********* ****

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