QoS for Surveillance

Author: Ethan Ace, Published on Jun 11, 2012

Along with VLANs, QoS is one of the most misunderstood topics in networked surveillance. Many purported "experts" claim it is required in any and all surveillance systems, but little clear guidance is given about why, leaving those new to the field confused. In this note, we cover the basics of QoS, what it is, how it is applied, and when it should be used.

What is Quality of Service?

******* ** *******(***) ****** ** ********** **** ** ****** ********* ********* *** specific ************. *********, ** ** ******* **** ** ***** ** VoIP ******** *** ******* ** *** **** ******* ** ******* data ******* (**** *********, ******** ***, ***.). ***** *** ***** are ****** *******-*********, ****** ***** ***** ********, *** *** ** adversely ******** ** ********* ** *** *******, ********* ** **** packets *** **** *******. ***** ****** *** ****** ** ******* frames, ******** *******, ****** ************** ** ***** *********** ** ************* effects.

Applying ***

***** *** ***** ******* ** ***** *** ** ********* *******:

  • ** ***********:******* *** ** *********** ** ******* **** ******. **** ****** categorizes *** ********* ********* ***** ** *** **** ** *********** it ******. *** *******, *** ******* *** ** ******** * lower ******** **** ********* *****, ** ******** ****** ***** ***** and *******. ******* *** ** *********** ******** **** *** ********** (cameras, ********, *******, ***.) ******* ***, ******** ***********, *** **** ****** ***** ***** ** ******* ******* ** its ***********.
  • ** ****:***************** ** ******** ********* ***, ******** * ******** **** ****** priority **** *** ****** ***, ** *******, *******, *** ******* clients ******* * ****** ***** ** *********. ******* *** ** VLAN ******** **** *** ******* ******* **** *******, *** *** is *** ** *** ******, ********* ******* ******* ** *** devices.
  • ** ****:*******, *** *** **** ** *** ** ****. **** ** generally *** **** ** ********, *** *** ***** ** ********* by ******* ************** ** ******** ******* *** ******* * ******* amount ** ********** ********* ** ******* ***** ****, ***** ***** performing ******* *****, ** ***. **** ****** ** **** ****-********* to *********, ***** *** ***** **** ** **** ** ******* login, ****** ********** **********.

** ****** ***** ****** ** ****, ** *** ** *******, managed ******** **** ** ****, ** ** ** *** ********* in ********* ******.

No **********

*** ** * ************** ** **** *****, *** *** * bandwidth *********, ********* *** ***** ** ***** ******* / **** are ****** *** *******. **** ******** *** ***** ********* ***********, allowing ******** ******** ** ******* **** * ****** ** *********, instead ** * ****** **************. *******, **** ** ********* *** used, ** ** ** ******** ** **** ********* ********** ********, and ********** ** ***** *********** ******* ******** ** *** ***********. In **** *****, ************** *** ******** ** **********.

Dedicated ** ****** ******* ***

*** ************* ***** * ********* ******** ******* (**** ****** ** ** *****), *** **** **** ****** ********* ******. ***** *** ** potential ***** ** ******** *******, *.*., ************, ****** *******, *** IP ******** *** **** ** *** **** *******, *** ******* this ** ****** ***********.

** ****** ********, *** *** ** ***** *** ******* ** any ****. ** * **** ** *****-****** ****** ******* * switch ** * ***** ****** ** ****** ************, ******* *** that ********* ********* ******* *** ** **********. *******, ** ****** systems, **** ** *******, ***-***** *******, ****** ************, ***., *** is **** *********, ** *** *********, ** ***** ******** *** easily ****** *********.

Setting ** ***

*** *******, ** * ****** ********** *******, ***** ** ************, voice, *** **** *** *** *******, *** ** ********* *** in *** ** *** ****:

  • *****, ** ***********, ***** ******** ******* ** ********** ************. *********, voice ** *********** *****, ******** ** *****, **** **** ********, internet ****, *** ***** ******* ****. *********** ** ***** ** most ********** ** *****, ***** ***** *** ****** ***** ******* better, ****** ***** *** ****** ********.
  • ** ****** *****: **** ***** ********, *** **** ** ********** ** **** camera, ********* ** ******** * ******** **** ***** (****), ***** correlates ** ******** *****, ******** ** *** ******. ** **** cameras, ********* ***** *** ** *** *** ******** **** ** audio, *****, *****, *** **********, ** ***** ********* *** *********** separately. ****, *** *** ***, ** ******* ******** ******** ** check ***** ** *** **** ** *** **** ******.
  • ******, ** ****. ** **** ****, *** ****** ***** ****, followed ** ********, *** ******* ** **** ******** *** ******** data ***** ***** ** ******** *** ** * *****. *** the **** ****, **** ** *********** *** **** ** *** by ***********, *** ********************* ** *** ****, ******* **** ********** *****, *****, */* data, *** ***** ***-***** ****** ********* *** ******* *** **** priority.

CBR **. *** *** ***

**** ******* * ******* ******* *** ***, *** *** *** up **** ****** ******* ** ******* ******* ** *******. ** do **, ****** **** *** **** ****, ** ***, ** **** **** ********* ******* *********** **** *******. ********* the *** **** ******* *** **** *********** *******. ***** *** or *** **** **** ******** * ***** ********* ******, ******** easier ********** ** **********, ***** *** ******** ************** ** *******, reducing ******* *** ****** ****.

***********

***** **** *********** ****** ** *** ***** ************ ******* ** a ********* *******, *** ** ********* *** ******. ** ******, shared ********, *******, ** ******* ***** ** ********** ********** *********** degradation.

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

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

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