PoE For Video Surveillance Guide

By IPVM Team, Published Jan 06, 2022, 09:09am EST

This guide provides comprehensive explanations of the elements in selecting and using Power Over Ethernet (PoE) with IP cameras.

IPVM Image

Inside this report we cover:

  • PoE vs Low Voltage
  • When to Use PoE, When Not
  • PSEs vs PDs
  • PoE Classes
  • 802.3af vs 802.3at vs 802.3bt
  • Nonstandard PoE Implementations
  • Passive PoE
  • Spare Pairs
  • Distance Limitations
  • PoE Extenders
  • Power Consumption vs Specification
  • Calculating Power Budget
  • PoE via Switch, MidSpan or NVR

Power Over Ethernet: Single Camera Power/Signal

All cameras need electrical power to operate. Historically, analog cameras were (and most often still are) used dedicated cables and power supplies, separate from the video cable. However, with the advent of IP cameras and PoE, power and signal could be combined on one cable, eliminating the second cable and power supplies, reducing costs.

PoE Almost Always Used

PoE is supported and used, in practice, in almost all professional IP cameras and installations. It is now very rare for cameras to use separate low voltage power, but there are some applications where this is necessary.

Exceptions To PoE Use

There are some exceptions where PoE is not used with IP cameras:

  • ******** ** ***** ********:** ************ ***** ******* are ********* *** ***** or ******** ********, ******* are ***** ******* *** local *** ******* ***** instead. ******** ************ ** the **** ****** ******* of ****, ****** ****** cameras ** ******* **** or ********** ***** **** commonly *** ***** *****.
  • ***** *****:***** ******* *** ***** may ****** *** ******* power ** ****** *********** from **/***** ********* ** higher ******** ******** *** PoE, ** ** ******* equipment ****** *** ********* efficiency ******** ** ********** voltages.

**** ****, **** ******* today **** ******* *** creating ********** ****** ** those **** ***** ***** low ******* ***** ** required. *** ******** *** details, ***:******* **** *** **** Cameras.

Power ******** ********** (****) **. ******* ******* (***)

**** ******* ** *** specs, ***** *** *** the ************* *** *** PD **** **********. ***** are ****** ********* *** Power ******** ********* (********, midspans, ****, ***.) *** Powered ****** (*******, ****** points, ***********, ***.).

IPVM Image

***** ***** *** ********* when ********** *** ******* and *******, ** ***** vary ********* ** ***** device ** ***** *********, detailed ***** ** **** report.

Applicable *** *********

*** ** ******* ** IEEE *********. ***** *******:

  • ***.********** ******** ***, ***** supports ** ** **.** (at *** ***). **** standard ** **** ** 90%+ ** *** ** cameras.
  • ***.********** "****" ***, **** by ** ******* ***** require **** **** **.**, up ** ***. ***.*** is **** ******** **** by ****, *** **** by **** ******* ******* with **** *****-****** *******/*******, as **** ** **** fixed ******* ***** *** more ********/******-***** ********** **, such ** *** *******.
  • ***.***** *** ****** ********,******** ** **** (*** our ******), *** ** ********* for ** ** ****, more ***** **** ** needed *** *** **** majority ** *******, ****** some ****** *** *** specialty ****** ******* >***. 802.3bt ** **** ****** to *** *** ** lighting, ********** ***********, *** other ***-******** ************.

PoE *******

*** ********* ******* "*******" which *******/******* **** ********* how **** ***** *** device ********. *** ***** below ********** *** ***** and *******:

IPVM Image

* ****** *** ************* should ******* **** * type *** *****, *** that *********** ** ********* ignored. **** *****, *** is ******* ** '***.***' only **** ** ***** modifier, ******* **** ******** between *.** ** **.* W ** ********* ** the ******. *******, **** a ***** ** *****, it ****** ******* *** minimum *** ******* ***** available. *** *******, ** a ******* ** ***.*** Class * *****, ** can **** ******* * max ** *.* *****.

PoE ***********

**** ********** * ******* device ** * ****** or ***** ***, * negotiation ******* ******, ** which *** ****** *** switch ********* *** ******* voltage *** ******* *** determine ***** ***** **** be ****. **** ******* is *****, * ****** of **** * *** seconds, *** ********* *** observable ** *****.

IPVM Image

No ******* ********* ******* ***********

*** ** *** ******* negotiation *******, *** ***** is *** ****** ****** a ********* ****** ******** it. **** ***** **** a ***** ********* ** a *** ** *** "electrified" ** *** ***** plugged ** ** * PoE ******, ** ** will *** ******* * safety ****** ******* ** incidental *******.

Wattage ***** *** *** *******

**** **** ***** **** cameras **** ***** ************ in ***** *****, **** does *** **** **** a ****** **** ** registered ** *** ****** PoE ***** ** * PSE.

*** *******, ** ** camera **** * ********* power **** ** ************ **** ***** *, but ** **** ** likely ** ** ********** as *. ***** ****** not ****** * ***** device **** ********* ** a ******** ***** ****** it ** ****** ** spec ******, *** **** then, ********** ** ******* as **** ******* *** simply ********** ** * by ***.

Class * ********* ******

********** ** ****** ***********, many ******* *** ********** by ******** ** ***** PSEs ** ***** * (max ** **.**) ** PSE. ******* ** ****, switches *** ******** **** power **** ** ********. So ** * ** cameras ********* ** **** (56W *****) *** ********* to * ****** **** a *** ***** ****** but ********** ** ***** 0, ******* *** *** all ***** ** ** may ***** *****. *******, in ****, **** ********* is ** ****** * problem, **** **** ******** ignoring ***** *** ****** allocating ***** ***** ** actual ****.

Proprietary ***

*** *** ******* ******** to ** *** *** the ***.***/** *********. ******* manufacturers **** ******** *********** variants ***** ***** ****** wattages, **** *******'* ********* ***(***) *********'* *******(***).

** **** *****, *********** PoE *************** **** **** with *********-***** *******, ** an ***.*** ****** *** be ********* ** * UPoE ******, *** *******. In ***** ********, ******** compatibility ** *** **********. Users ****** ******-***** **** compatibility ****** ********** *********.

Passive ***

** ******** ** *** 802.3af/at/bt *********, **** ******* use **-****** "*******" ***, which ******* ** ** 24 *** **** ***** cable ***** **** ** negotiation ******* **** ** standards-based ***. ***** ** supplied ** ***** ***** whether *** ****** "********" it ** ***.

** **** *****, ******* devices *** ****** ******* PoE ******* *****. *******, those ***** *** *** specified ** *** *** be *******. ******* ** this, ** ** *** recommend ***** ******* *** unless *** ****** ********** specifies **.

******* *** ** **** common ** ******** *********, such ********************, *** *** ****** in ** *******.

Alternative * **. *********** *

*** ** ******** **** different **** ********* ** the ***** ****** ****, referred ** ** ************ A *** *.

  • *********** * *** ******* power ** *** **** pairs **** *** **** (pins *, *, *, and *) **** *** remaining *** ***** ******
  • *********** * ******* ***** on ****** ***** (**** 4, *, *, *** 8)

IPVM Image

**** ************ ******* ****-***** which ***** *** **** to ****** *****. **** PoE ******* *** '********* A ** * ********' and **** **** ******* issue ***** ****** **** of ******. *******, **** devices **** **** * minority ** ********** (**:**** *** *********) ** ********* **** specific. (*** *** ** Type * *** ****.)

***** *** ****** ***** of **** **** ********* to ******* ********* (**:***/*** **** ** *), ***** ********* ****** the * **** *****, not *** ***** *****. Regardless ** ***** ****** standard ** ****, ** power ******* *** ******* comply **** *** ***.***/** spec, ***** *********** **** be **** ** *** same ***.

Distance ***********

*** ** *********** ******* to *** **** **** distance ********** ** ** non-PoE ******** *******. **** carried ** *** ***** will **** *** ******* before *** ***** ***** below **** *** ******** guarantees.

****** ****, ***** *** two ******* ******* *** extended ****** ***: ********* and *********** **** ****** PoE.

PoE *********

*** ************ ********* **** than ****, *** ********* are *********. *********, **** are ***** ** ******** for **** ******, **** power ******** ** *** headend ****. *** ********* often ******* **** ** even ** ** **** total ********.

IPVM Image

*** ********* **** ** price, *** ********* **** for $***-*** ***. *** more, ******* ** ****** *** Options: *****, *** ********* and *** ********.

Proprietary ******** ***

**** ************* **** ******** NVRs *** ******** ***** allow ****** *** *********, as **** ** ***-****. This ** ********* ******** by ***** ****** ******** (70-80VDC) ** ******* ********** ****** ****** *********.

**** **** ***** ******** are *** ************ *** are ********* ** **** only ****** * ***** manufacturer's ******* **** (******* ******* **** ******* NVRs, *** *******). ***** standard ******* ** ***** configured *** ******** *** may ***** ****** ** the ****** ** **** often *** ********* *******/*******.

** *******, ******** *** will ******** ****** ****** the ******* **** ******** limit. ** ***** ****** **** ******** Ethernet ****, **** *** ******** were ******** * **** 1,000' **** **** *** source, ****** *** ***** any **** ***** ****** on *** **** ********* cable. *******, ****-****** ****** are *** ***********, ** they ** *** **** standards *** ****** ********** ************ **********.

Typical *** *********** ** *************

**** ** ****** ************ publishes ************** *** ***** draw ** ******** ** whether ** *** *** camera ******** ***. **** is ********* ******* *** much ***** ***** *** need ** **** ** all ******* *** '*******' 802.3af ***, ***** **** can ***** **** ** low ** * ***** to ** **** ** 15. ** * ******* rule ** *****, ***** IP ******* ********* ******* about * - * watts ** *****.

** ****** ***** ************** are ********* ****** **** what ** ******** ******** by *** ******, ** verified ** ***** ****** *** ***** Consumption ****.

Calculating ***** ******

******** ** ******* *** typically ******* ** * single ******. ** ****, one ***** ** ***** and *** ** *** individual ***** ************ ** cameras ** ***'* ******. For *******, *** *** cameras ***** ***** *** power ****, *** *** switch ** **** ** supply **** *** *****. Because ** ****, *** camera **** *** ***** up ** **** ***** power **********.

IPVM Image

PSEs: ********, ****, ********

*** ** ********* ******** in *** ** ***** ways:

  • **** * ******* ****** that ******** ***
  • **** ** *** **** an ******** *** ******
  • *** * *** ********* in ****** **** *** cable ****** * ******* injector

*** ******* ****** **, by ***, *** **** common ******** *** ********* PoE *****. *** ******* is **** **** **** often ****** ** ********* by **** ** ** allows ********** ****** ********* and ******* **** ******* / *** *****. ******** PoE **** *** ********* used ** ******* ***-**-*** IP ************ *******.

Switch ******

**** *** *** ** PoE ****** ** **** areas, ******* ******** **** offer *** ** *** difficult.

*******, **** ****** ** taken ** ******* ***** is ********* ** *** switch *****. ********** ** lower-end ** ******** ****** gear, ** ** ****** to ****** *** ** one ** **** *** available *****, *** *** them ***:

IPVM Image

**** '************' ******** *** only ******* ***** ***** that ** **** ** what ** ****** *** full ***.*** *******. *** example, ** **** ******** often ******* ** ***** watts ** *** *****, which ** ********** ** 7.5 * *** ****. If *** *** ** cameras ** *** ** ports, **** *** *** require **** ** ***** total.

** **** *****, ******* can ******** ** ******* and ** ******** *** a '***' ****** ****, in ****, ** **** the ****** ** ******* off ***** ******* ** does *** **** ********** power ** ******* *** cameras (****** ***** *********** **** *******). *** a ****** *******, **** switches ***** '****' *** power ** *** *****. In *** ** **** switch *******, **** ***** be *** ***** (*.*., 15W * **).

PoE ******** ****

**** **** **** *** switches *****-**, ******** ****** *** ***** systems. *** **** ******* of ***** ***** ** simplicity ***** ******/********** ** a ******** *** ****** is **********.

IPVM Image

**** **** ***** ****** be ********** ******* **** calculating *** ***** ****** for *** **** *** NVRs, ** ***** ***** often ******* **** ***** power ******* ** *** ports *** ********* ** not ******* ***.***.

PoE ********

******* ***** ********* *** the ***** ****** *** source **** ** ****, but *** ********* ** applications ***** *** ******* are ******* *** * non-PoE ******* ** *****-***** switch ******* ******.

*** *******, ** * cameras *** ********, *** only *** ** ***.***, it *** ** **** cost-effective ** *** * lower ***** ***.*** ****** and * ****** ***.*** injector.

IPVM Image

**** **** ******** *** also ** **** ** line **** ***** ****, e.g., ******** ** ****. Since *** ******* **** not ******* ***** **** the ****** ** ***, they **** *** ******* any *** *****, ** the **** *** ******* to *** ***** ** from *** *******. **** is ***** **** **** a *** ****** ** in ***** *** **** cameras ******* ****** *****, so **** *** ******** may ** ****. ** tested **** ******** ** our*** ******* **** ****** Tested****** *** ******** *** mechanics ** **** ******.

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

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

[**** ****** *** ******** written ** ****, *** updated **** ****-**** ** reflect ******** ** *** standards, *** *********/****-******** ********, switch/NVR *****, *** ****]

Comments (2)

***** *** *** ******** #3 ** *** **** it's * ***** :) Read ** ** ******* and ******** ******** **** this ******* **** ******** about **.

Agree
Disagree
Informative
Unhelpful
Funny

**** ****'* ** *** list ** ******** *******....?

IPVM Image

IPVM Image

Agree
Disagree
Informative
Unhelpful
Funny: 2
Read this IPVM report for free.

This article is part of IPVM's 7,419 reports and 980 tests and is only available to subscribers. To get a one-time preview of our work, enter your work email to access the full article.

Already a subscriber? Login here | Join now

This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.

Loading Related Reports