STP vs UTP for Video Surveillance Tutorial

Author: Brian Rhodes, Published on Dec 20, 2017

For many video system designers, deciding which ethernet cabling to use is a quick decision: go with the cheapest. However, this overlooks the possibility cable, and the video it carries, needs extra protection against common electromagnetic 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 nonshielded alternatives.

Inside this note, we explain:

  • How Electrical Interference Affects Video Quality
  • What Shielded Cable Looks Like Compared To UTP
  • Physical Differences Between Cable Types
  • Other Names For STP
  • Typical STP vs UTP Costs
  • Use STP Against Common Sources of Interference
  • Practical Use Is Limited, But Axis Disagrees

One Of Many Cable Tutorial Series

This tutorial is one of a number IPVM has addressing the topic of cabling. Others include: Cat 5e vs. Cat 6 for IP Cameras, Cabling Best Practices Guide, Network Cable Testing Guide, Grounding and Bonding for Video Surveillance, and more.

*** **** ***** ****** *********, ******** ***** ******** ******* ** use ** * ***** ********:** **** *** ********. *******, **** ********* *** *********** *****, *** *** ***** it *******, ***** ***** ********** ******* ****** *************** ************.

** *** ********** ******* ***** ***** **** ***********? ** **** note, ** ******* ******** *****, **** ** *** ** *** prevent ***** ********, *** ******* ** ** *********** ************.

****** **** ****, ** *******:

  • *** ********** ************ ******* ***** *******
  • **** ******** ***** ***** **** ******** ** ***
  • ******** *********** ******* ***** *****
  • ***** ***** *** ***
  • ******* *** ** *** *****
  • *** *** ******* ****** ******* ** ************
  • ********* *** ** *******, *** **** *********

One ** **** ***** ******** ******

**** ******** ** *** ** * ****** **** *** ********** the ***** ** *******. ****** *******:*** ** **. *** * *** ** *******,******* **** ********* *****,******* ***** ******* *****,********* *** ******* *** ***** ************, *** ****.

[***************]

Electrical ************ ******* ***** *******

** *** ***** ************ *****, *** ******** ** ***** ** cameras *** ****, *** ****** ********* ** *** ******* ** between. **** ***** ******* ******** *****, ** *** ** * frustrating ******** ** **** ****** *** ***** ********, **** ** discover ******** *** ***** *******.

*******, ****** * **** **** ** ******* *** ******* ********* issues. **** *** ******* ** *** ***** *****:

emi impact on video

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

'STP' ** ********** ***** *********

* ***** ******** ********** ******* *********** *** *** ***, ** 'shielded ******* ****' ******* ******* *** ******* ***********. *** ***** below ***** *** ********** ******** **** ********* *********** **** ***** in ***:

stp vs utp

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

Other ***** *** ***

*** ****** ************ *** ******** ******* **** *****, '***', ** sometimes ****** '*/***' *** '**********/****-******** ******* ****' ** '*/***' *** 'Shielded/Foil-screened ******* ****' *******. ********** *** ********** ******* **************, **** may *** ***** ********* ************* ** ******** ******** *******. *******, in ******* ***, *** '***' ************ ** **** ****** ****.

Physical *********** ******* ***** *****

*** ********* **** ********** *** ******** *********** ******* *** *** STP.

  • ******** **** ******:* **** ***** ** ****, ******** ********, ********* **** *****. This ***** ** ***** ****** *** '*****', *** **** ** properly **********. ******* ** ********** ****** *** ***** *** ******* the ******** **** *** ******** ** ********.
  • ******* ******:*** ***** ****** ** **** ******** *** ****** *** ******** to *** ***** ******. ** * ******, * ******* ******* insulating ****** ** ******, ***** **** ********. *******, *** ** heavier *** ******* ******** ** ***, *** *** ** **** difficult ** ******* ** * ******.
  • *****, **** ******, *** ***********:********* ** *** ***** ************ *** ***** ** ***, ***** features *** ** ******* *** ******** ***** ** *** *******. This ******** ******* ******* '****' ******, ******* ** *** ********* the ******, *** ********** ********** ********* *****. ***** ** ** outdoor ***** ***** **** * ****** **** **** ********* *** pairs **** ********* ****** *** ******.

outdoor rated cable with center core

STP ** *** ********** ***********

***** ********** ******** ******** ******* *** **** ********** **** *** does *** *******.

  • *** **********:*** ******* ********* ** ********* ** ********** **** **************************** ************, ** ***. ******* **** **** ** ************ *******, *** ability *** ******* ************ ** ******** *** ***** **** *** cable ** ************* ********* ** **********.
  • ******** **** *****: ************ *** ** * '***-*** ******' ** **** ********** cabling ** * ****** ****** ** ************. ** **** ************, like ********* ******* ******* ** *************, ****** ******** ******* *** be * ************ ******* *** ************ **** ****** ***** *********** off. *****, *** ******** ** **** ********* ********* ** ********** this *******.

Cost **********

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

Use *** ******* ****** ******* ** ************

******, *** ****** ** **** ***** ************ ***** ** * problem. ** **** ** ***** ***** ****** ******** *** *****, here *** **** ****** ***** ************ ***** ****** ***** *******:

******** ** **** ******* ******

***** ****** *** ********* **** **** ************ **** *** ******** to ** *** **** **** *****. **** ****** *** * compliant ******** ***** ****** * ******** ******* *** ** * source ** ***** ************.

high voltage power causes emi

***** ** **** ************* ****** *** **** ** *** *** in **** ********* *** *****, **** ********* ** **** ********** design ****** **** *** **** ******* ******* *** **** *******, regardless ** *** ** ** ********* ***** ** *******, **** ** *** ***** *** *****.

**** ********* *******

**** ******* *** **** ****** ***************** ******** **** ******** ******, power ************, ******** *****, ** ********* *** ********* *********** ***. Especially *** ********** **********, ***** ***** ******* *** ******, ********* cable **** ** ** ********* **********.

inductive devices cause emi

***** ******* *** ************* ** ***** '*********' **********, ** ***** ******** ** ******** ****** *** *********. Cable ********* ** ******* **** **** *********, *********** ****, **** maglocks, ********** **********, *** ********** ********* *** ******** ****** ************ to ******* ***** *******.

*** *******/****** *******

****** *** ******* ************* ****** ******* **** ************. ***** * token ******* *** *** ** *********** ****** ** ** * problem, ******** **** **** **** **** ******* ********* ** ************ should ** *** ***** *** ** ********* ********.

low powered communications equipment

**************** ********

*** ** *** ******* ******* ** *** *** ****** ***** fixtures. ***** *** ****** ********** ** ******** ****** ******* ******** of ***** ********, ** ******* ****** ** *** ** ****** cable ***** *********, ** ****** ** *** ***** *** *****.

fluorescent light fixtures

**** *****, ***** *** **** ********* ***** ******** '********* ** others' ** ** ** **** *** *****. ** **** *****, cabling ********** ********* ** *** ****** ** ***** ******* ******** that ****** ******* ***** *** ***** ******* ** *********.

Practical *** ** *******

** *** **********, *** **** ******** ** *** ************ ******** cabling *** **** *** ***** ***, *** ** **** ** significant ****** ** ******. ***** ********** ******** **** *** *********** shield ** ************ ************ ** ********** *** ********** ****** "**** *********", ** ** ********* ******** *** ***** ******* ******.

Axis: ********* *** *** ********

******** ***** **** ************** ******** *** ** *** ********* *** outdoor ******* *** ************ **********:

"*** ************** ** ** ****** ** *** ******* ***** ** 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 ******* **** *** ** ****** ******** ******** ** ****** problems *****.

******, *** ********** ********* **** *** *********** *********** ** ***. The ******** *** ** *** ** ***** ******** ** *** in *** '**** ****' ***** ********** *****.

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

***** ****** **** * * ********* ****

[****: **** ******** *** ********** ********* ** **** *** ************* revised ** ****]

Comments (23)

******* ************** ******** ******** *** ********* *** ********* * *** of *** ****** **** ** *** ***** **** ****.******* *** ****** ************ **** ****** ********* *** **** ********* in *** ********** ******* ********. ** **** *** ******** **** them, **** *** ***** ******** ***.

************* * *** ** *** ****** ******** **** *** ******** transitioned **** ****** ******* ** ** *******. ************* **** ********* that ****** *** **-*, **** *** **** *** ***/*** *******. Performance ************ ** *** ****** ******** *** **** **** ********, compared ** *********** **** ********. ******** ********, *********** **********, **** field ************, *** ********** ** **** **** *************.

***** * ********** *** ******** ** ** *** ******* ******, I ***'* ******* **'* ********* *** *** ******* *******. *** components *** *** **** ******, *** **** ***** ********* ** install. **'* *** **** *** *****, *** *** ***** ******, jacks, *** ***** ***** ** ****. **** **** *** ********** expense **** ******** ** * ******** ******** *** ************.

** **** ** ** ****. ***** ******** ******** *** ****** delivery. ** *** ******* ** *** ***** *** ******** *** other ******** ********** ******** ** ****** ****** ******** ** ******** traffic *****, *** ** *** ******* ***'* ********* *********** ****** the ************** **'* * **** ***** ** ****.

**'* *** **** *** *****, *** *** ***** ******, *****, and ***** ***** ** ****. **** **** *** ********** ******* when ******** ** * ******** ******** *** ************.

*******, *** ** **** ** ********* ******* *** ***** **** be ******** ******** ** *** ********* *** **** ** ** antenna - ******** ********* ** *** *** ***** ***** ********** than **** ******* *** *******, ****** ***.

...*** ***** **** ** ******** ******** ** *** ********* *** work ** ** ******* - ******** ********* ** *** *** cause ***** **********...

*** **** ** *** ****** **** ** *** *****, *****?

***, ** * ********** ** (*** * ** ** ***** expert) ********* ** *** ******, ** ***** ***** **** ** all **** ** ********. ********* **** ***** *** ***** ****** loops *** ***** **** ** ** ** *****-***** *********** ***** don't ********* **** **** ******** **************. ****** **** **** ** is ****** ** ***** ****** ***** ********** ** *** ** through *** ***** **** ** ********* *** **** ***?

********* ** **** ** *** *** ****, ******** *** ******** end "***** ****** ** ******" ***** ****** ********* ** ************.

*** *******, **** (******) ****** ************* ******* ********* ** *** reader, *** *** **********, ** ******. **** ****** *************, ********** PTZs, ******* ****** **** ** *** *********.

** *******, *** ****** ** **** ******** ** **** ** the ****** ****, *** *** ** **** ***** ******* ********** earth ******.

** ** ***, ** *** ******** * **** **** ***** at *** ** *** ****** *************. ** **** ******* *** and *** ********* ******* ** **** ***** *** ** *** what *********** *** ** ****. **** *** **** **** *****!

****** *** *** *******. ** ***** ** ***** ***** ********** and *************** ** ******** *** ** ***** ************ ******** ** ********** ******, *** *** '**** *********' ****** ** useful.

********** ****** *** ** **** * **** ** *********** ** *** ***** *** *** ** **** **** ** is.

********** ****** *** ** **** * **** ** *** ****...

**** ***’* *********’*****:

****** *****. *'** **** * ***** **** *** **** ** years... ***** ********... ***** ************. ******... ***** ********* ****** **** a **** ** *** **** ** * ********* ****** ** nothing ****. ***** *********!

**** = "****** **** **** ****"

***** **** ********* **** **** *** **** **** ****** ******* is ******* ** *** ***** ******* ** **** ****** *********. Not **** *** ****** ** ** ***** ** ********* ** keep ** **** ***** ********** ****. ******* **** **** ** running ***** ** ********* **** ***** **** ** *****. ********* inside *******.

******* ** **** ** ** ***** **** *** ********** ********** runs ***** *** *** ******* **** **** * ******** ********** to ****** *** **** *** **** *******. ** **** ***** the *** ******* *** ** **** ****** **% ******. ** if ***** ** * ******* ** *** *** ** *** time. ** **** **** ** *** **** ********* *****. **** expensive ** ***** **** *** **** *****.

* **** **** ******** *********** *** *** ***** *** ***** house ** *** *** *** *** ******* ************** **** **** can ***** ***** ******* ******* **** *** **********/********** **** *** all *** **** **** **-*****.

**** **** ** ****** ** ****** ****** ***** ** ****, like *** ** ***, ***. ** *******, ** ***** *** talking ***** *** ** *****. ** *** **** ****, **, 7 *** **** ******, *** **** ******* ******** ** ****.

**** * ***** ** ******, * *******, **** **** ** the ********** ***** ***** ***** **** ***** ***** (*** ** the **** ***) *** **** ******* **** ***** ** * cable *** ******* *** **** ** *** *******

***** ***** *** ***

***, *** *** ** **** *** ***** *** **** ********* instead ** ‘***’ *********** *** **** ********* ****:

***** ** ** ************* ***** ****** *******?

** *'* ***** * ** ***** **** ******, **** * use ** *** ***** ** ******* *******?

*******, ****** *** *** ********.

******* '*********' ******** ******* ******* (***) *********** **** ****** (****** loss), *** ********** ** *** *** ***** ******* ** **** as ** ** *** ***** *** ******.

** * ***** ** ************, **** ***** ** ******** ** design, *** *** ************* ** *** ****** *********** ** ****** loss. *******/**** ***** ********* (**: ***) ****** ******* (**: ****) results ** **** **** **** *** ****** ** ***** ****.

** *** **** ** *******-****/****** **** *** ********, ********* ***** reduce ****** ****, ******** *** **** *** **** ** ******* to ***** **** **** *****.

******* '*********' ******** ******* ******* (***) *********** **** ****** (****** loss), *** ********** ** *** *** ***** ******* ** **** as ** ** *** ***** *** ******.

** ***** **** * *********** ***********, * ***** ***** *** opposite, ** *** ** ***** ******* ** *********.

**** ******,******** **** ***** *** *** **** *** *****, *** ** not ******** *** ** ******-****-*************** ******* ** *** ******* ** ********.

**** *******, **** *** ***** **** ***** ** **** *** will ******* ** *********/********* ** *** ******** ** ** ***** varying ******* ****** **** *’* *** *’*. **’* **** *** extreme ***** **** ********* ** * ******* ******.

****.

*****: ** *******, *’* ****** **** *** ****** ** *** on *** ****** ****** ******* ** ** ********* ** **** of *** ******. *** **** *** ****** ******* ******* ******* as ****.

* ** ****** **** ** ****** ** ****** ************ - signal **** - ***** **** **** ****** *** ** **** important ** ******* ***** ****** **** ***** *******.

****** ** **** ** ****** *** ******** ***** ******* *** impacts. ********* ***** ******* **** ****.

********* ***** ******* *** (********** ******** ************). ****** **** ** caused ** *********** (**** ** *** ****** ******** ******* *** length ** *** ************ *****). **** ** ***** ** **** or *** *****, **** ** ***** ********** **** **** ****.

*** ***** **** ** ******* ******* ******* *** ********** **** UTP *****, ********** ** ***** ********* (******* ** ********). ***** twist ******* ****-**-**** *****-****, ***** ** ****** ******* ******* *** pairs ****** *** ***** ******. *********** *** ** ******* ** using * ******* ***** ****. *******, ** ***** **** **** have **** *********** **** ** ***** **** ******* ** **'* electrical **********. **** **** *** *** *****, **** ******** *** 24 ** *** **** *** ** **. **** ** ********* found ** ******** * ***** ***** *** ****** ****.

**** ** * ***** ****** *** ****** ******* ******* ** its ****** ****** *** *** ******** **** ** **'* *********. The ********* ****** *** *** **** ** *** ********, ***** path ****, **** ******, *** **** *** ****** ************. *** with ****** *** **** ***** **** ** ***** ***** *******, and ******* * ****** ************** ******* **** ** ** ****** connectivity.

*'* *** *********** **** *****, **** ****** ****** **** *** weeds.

*** **** ****** *** **** ***** **** ** ***** ***** comings, *** ******* * ****** ************** ******* **** ** ** camera ************.

* **** ********* ***** *** **** *** ** *********** **** STP **** ***** ******. * ***'* ******** ** ** *** a ********** ****** ** *** ********* ****** **. ** **** done ** **** **** ******* * ******* ** *** ****.

******* **** ** ** ********. ** *** ******* *** *** grounded ********, **** *********** ****** ******** *** *** **** ** where ** **. **** ***** ** *** **** ****** *** recommendation *** ****. **** * *****.

** *** ********* ** **** ******. *** **** ***** *** lines ** ******* **** **** ** **** ************, *** **** an ******* ******.

****** ***, *** *** ***** ** **** *** *** ******, the ****** ***** *** ********.

****** * **** ******** ***** *****, **** *********, *** **** shielded ** ********** ***** **** *****, * ****** *** * company ***** * *** ** *** **** ******. ** ***** run **** ******** ***** **** ** *** ****, *****, ** the **** ***' ***. ******* **** ** **, ** ** surprising **** ** ***** ****** *** ******** ***** **** *** horrible *********** ** ******* ***** **** ********* ***** ******** ** us.

*** **** *** *** **** ***** ******* * *** ***** of ********** ************ ** *** ****** **/** *********** **** *****.

**** *** ****** ***** * **** ** **** *** ***** others **** ***** ******** ********. *'* *** **** ** * book ******.

**** ********* *** *** ******** ** **** **** ****** ****** to ******* ***** *********. *** ** **** ********** ************. ******* provides **** **** ***** ** ****** **** ******* ******* ** this *******. **'* ******** ** ************* ******, *** ***** ******** for ******* ****** ****. *** ****** ** ****** ***** **********.

****** **** ******, ***, ** ****** ********* ****** **** **** the ******** **** ********* **** **** **** ******** ***** ****** you ******* * ********* ****** **** **** ** ** **** resistance *** ******* *** ** ****** **** **** ******** ***** - ***** ******* *****

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