Please consider registering
guest

Log In Register

Register | Lost password?
Advanced Search

— Forum Scope —

 
 

— Match —

 
 
 

— Forum Options —

 
 
 

Minimum search word length is 3 characters - maximum search word length is 84 characters

Topic RSS
How far can this run PoE?
June 23, 2014
1:41 pm
jake
Member
Forum Posts: 6
Member Since:
May 31, 2014
Offline

I recently bought this NVR for an 11 camera system I'm installing. I am looking at using these cameras and powering them via PoE. I looked at the voltage calculator and tried to fill it out.. not sure if I did it correctly though. With 11 devices, I was wondering what the max length of cable I can run - some cables will be shorter than 20 feet, some might be longer than 100. How would I calculate the maximum supported length?

The spec sheet says 15W/PoE port, but I didn't see amperage.. and I'm not quite sure how to calculate it anyways. Any help is much appreciated

June 23, 2014
1:48 pm
Brad Besner
Boca Raton, Florida
Admin
Forum Posts: 190
Member Since:
March 9, 2013
Offline

Hello,

The POE distance limitation is about the same as it is for Ethernet. Typically you can go up to 300'ft from the POE device to the camera. The POE output will be 48V not 12V. This allows for the greater distance taking into account voltage drop for 300ft distance on 23 or 24 gauge ethernet cable. 

June 23, 2014
1:50 pm
jake
Member
Forum Posts: 6
Member Since:
May 31, 2014
Offline

Thanks for the reply, I appreciate it. Could you point out where it says the output is 48V?

June 23, 2014
1:54 pm
Brad Besner
Boca Raton, Florida
Admin
Forum Posts: 190
Member Since:
March 9, 2013
Offline

all POE output is 48V. There are two POE standards. 802.3af and 802.3at. The 802.3af is 48v 15.4watts and the 802.3at (also known as POE+) is 48v and 25.5watts. This is the industry standard. 

June 23, 2014
1:56 pm
Brad Besner
Boca Raton, Florida
Admin
Forum Posts: 190
Member Since:
March 9, 2013
Offline

also, if you check the downloads tab of the NVR you purchased you will see specifications. On the second page it says:

16 ports (IEEE802.3af) This refers to the POE standard 802.3af I was referring to. 

Forum Timezone: America/New_York

Most Users Ever Online: 41

Currently Online:
11 Guest(s)

Currently Browsing this Page:
1 Guest(s)

Top Posters:

shockwave199: 156

MrDeepFreeze: 94

tubac: 63

smokey44: 40

night hawk: 40

ShawnInFL: 31

West Coast Jones: 26

Craig: 20

BobS0327: 18

ljjhouser: 15

Member Stats:

Guest Posters: 4

Members: 612

Moderators: 8

Admins: 4

Forum Stats:

Groups: 5

Forums: 27

Topics: 475

Posts: 2192

Newest Members: shail, specops805, jgodfrey82, twawsico, mrkuchuk, javajeff, williamsjohn, karlpox, silentpercussor, tromollo

Moderators: Daniel Ross: 287, Matt Stetson: 17, Ryan Newkirk: 40, Jesus Ragusa: 248, Zeke Richey: 31, Gilberto: 29, Jose Malave: 167, Brian Lee: 7

Administrators: Security Camera King: 9, Damon Delcoro: 8, Brad Besner: 190, Dro Simoes: 39