Avatar
Please consider registering
Guest
Search
Forum Scope


Match



Forum Options



Minimum search word length is 3 characters - maximum search word length is 84 characters
Register Lost password?
sp_Feed sp_TopicIcon
How far can this run PoE?
sp_NewTopic Add Topic
Avatar
jake
Member
Members
Forum Posts: 6
Member Since:
May 31, 2014
sp_UserOfflineSmall Offline
1
June 23, 2014 - 1:41 pm
sp_Permalink sp_Print sp_QuotePost
sp_ReportPost

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

Avatar
Brad Besner
Boca Raton, Florida
Admin
Forum Posts: 203
Member Since:
March 9, 2013
sp_UserOfflineSmall Offline
2
June 23, 2014 - 1:48 pm
sp_Permalink sp_Print sp_QuotePost
sp_ReportPost

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. 

Avatar
jake
Member
Members
Forum Posts: 6
Member Since:
May 31, 2014
sp_UserOfflineSmall Offline
3
June 23, 2014 - 1:50 pm
sp_Permalink sp_Print sp_QuotePost
sp_ReportPost

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

Avatar
Brad Besner
Boca Raton, Florida
Admin
Forum Posts: 203
Member Since:
March 9, 2013
sp_UserOfflineSmall Offline
4
June 23, 2014 - 1:54 pm
sp_Permalink sp_Print sp_QuotePost
sp_ReportPost

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. 

Avatar
Brad Besner
Boca Raton, Florida
Admin
Forum Posts: 203
Member Since:
March 9, 2013
sp_UserOfflineSmall Offline
5
June 23, 2014 - 1:56 pm
sp_Permalink sp_Print sp_QuotePost
sp_ReportPost

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: 727
Currently Online:
Guest(s) 10
Currently Browsing this Page:
1 Guest(s)
Top Posters:
Techpro Security: 404
shockwave199: 179
tubac: 167
Jer7of9: 155
Gilberto: 150
MrDeepFreeze: 136
Night Hawk: 100
Mark: 89
West Coast Jones: 66
ShawnInFL: 64
Newest Members:
RobertSnany
ButUricy
chrisoco
Janelaw
Jampralk
CheRam
will
Toadaly
wella
FredMok
Forum Stats:
Groups: 5
Forums: 28
Topics: 1496
Posts: 5993

 

Member Stats:
Guest Posters: 141
Members: 22947
Moderators: 7
Admins: 5
Administrators: Damon Delcoro, Brad Besner, Jose Malave, Damon Delcoro, Tony Petruzzi
Moderators: Zeke Richey, Eric Wilson, Yarden Pinhasi, Joe Shopsin, jwilhelmi, Jorge Nava, Tyler Rittel