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Questions tagged [power-over-ethernet]

Power over Ethernet is a family of IEEE 802.3 standards that define power provisioning to a network device through the twisted pair network cable.

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What is the recommended way to set up POE-LLDP fields after POE-hardware negotiation

I have been working a bit with POE powered devices and POE switches and I wish that the behavior of POE switches when it comes to POE-LLDP was more consistent. For example, there is one type of switch ...
Kenneth Ekman's user avatar
3 votes
1 answer
77 views

Methods to detect when a POE powered DUT is connected to a POE switch behind a POE injector

I am working with POE powered devices, and one use case we see is that our device is connected to a POE injector, but behind the POE injector, there is a POE switch that can do LLDP negotiation. (The ...
Kenneth Ekman's user avatar
0 votes
0 answers
181 views

POE 802.3at hardware vs LLDP negotiation

I have tested a 802.3at switch (POE PSE) that gives the PD device 25.5W through hardware negotiation. After the PD device boots, it checks the LLDP POE fields and sees this: So, the switch reports ...
Kenneth Ekman's user avatar
1 vote
3 answers
532 views

Yealink & Aruba 1930 Switch Connection Issues

Good day, I have connectivity issues on my network. I recently installed new Aruba Instant On 1930 switches with POE and SFP+. After the new install I started having connectivity issues to my Yealink ...
Sakkie's user avatar
  • 21
3 votes
1 answer
851 views

How PoE interacts LLDP and LLDP-MED?

I need to research 802.3at PoE PSE capable equipment for a project in my company's network, but I have some knowledge gaps regarding PoE operation and its reliance on LLDP. I took a look over 802.3-...
Marcus's user avatar
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2 votes
2 answers
502 views

Adapting 10GBaseT and NBaseT with a PoE Injector?

Suppose I have a device that supports 10/100/1000/10GBase-T ("Firewall") and another device that supports 10/100/1000/NBase-T ("Modem"). Now, I could connect these two devices ...
SEJPM's user avatar
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0 votes
1 answer
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Slim Ethernet 28AWG Length Limitation question for IDFs

anyone have experience with the slim ethernet cabling? I see a lot of atricles stating they are limited to around 30ft. Does this footage include the in-wall cat6 run from Patch panel to Desk drop? ...
CableMeThisBatman's user avatar
0 votes
2 answers
31 views

Dell PowerConnect 5548P no power to Ubiquiti ER-X

I have an old 5548P that I'm trying to add to my current stack. I have an Ubiquiti ER-X that I'm trying to supply power to over PoE, but I'm not getting anything. The ER-X pulls 5W, and a port on the ...
tripleblep's user avatar
3 votes
2 answers
2k views

Daisy Chaining POE switches

I was reading about daisy chaining PoE switches and I had a doubt regarding it. While implementing this configuration, do we daisy chain the power or the data or both? Is it dependent on the wiring ...
user86914's user avatar
2 votes
2 answers
356 views

POE injector to extend the number of devices

I have a networking problem. I have a network that runs of a POE switch that is routed to a relatively deep chain of POE powered switches that also passthrough POE. The problem becomes that the load ...
John Smith's user avatar
1 vote
1 answer
468 views

What does `action errdisable` do differently when issuing `power inline police`?

While learning for my CCNA exam, I was looking over Cisco's PoE guide. It explains how to configure PoE so that a port changes its behavior when a device draws too much power: power inline police: ...
Jan Berndt's user avatar
0 votes
1 answer
412 views

PoE cable into console port

Every guide I read mentions how you can't use PoE supported cable for console port, RJ45 not USB, because you can fry the port but aren't all cat 5e and after cables PoE compatible, and I was always ...
KinkyWizard's user avatar
2 votes
2 answers
118 views

Why is a PoE circuit limited to 328 feet?

I'm trying to learn about PoE and a friend told me the 100 meter limitation on a PoE circuit is because of the DC voltage drop on the power channel, not the data. I had understood the opposite, that ...
Nicknamednick's user avatar
1 vote
2 answers
69 views

Do PoE lighting systems require a separate network from other PoE systems?

I'm new to networking and PoE but am trying to understand it enough to explain myself. I recently spoke to a Genisys lighting rep who told me their systems couldn't be on the same network as an IP ...
Nicknamednick's user avatar
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1 answer
106 views

What does "inline" mean in the context of cable testing?

I hope the title is self explanatory. I was unable to find anything about the term on google however my intuition says that an "inline" tester would intercept some signals going from A to B ...
Mantas Kandratavičius's user avatar
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0 answers
538 views

Issues (and spec check) regarding terminating solid core ethernet cable

Tomorrow I'm installing a TP-Link TL-SG1008MP 8-Port Gigabit PoE+ Ethernet Switch to an existing network, powering a TP-Link OC200 Omada AP controller and three TP-Link EAP225-Outdoor access points ...
Ben's user avatar
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1 vote
2 answers
1k views

In practice, how much can the 100m ethernet limit be pushed?

I am faced with putting an outdoor WiFi access point about 800 feet from the nearest building. There is no power at the far end. This will require a weatherproof AP that accepts PoE I've looked at ...
Sherwood Botsford's user avatar
1 vote
1 answer
50 views

PoE standard compatibility [closed]

I'm not sure if I understood all found info correctly, so I'm asking a question here. I want to buy: Mikrotik hEX PoE (RB960PGS) as entry point of my home network PoE out ...
Zwei's user avatar
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1 vote
1 answer
94 views

Which type of ethernet cable for external runs to cameras and home office? [closed]

I'm sure this question has been asked a hundred different ways, but I've been struggling to piece the various bits of information together and finding quite a lot of misinformation about ethernet ...
Tim's user avatar
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0 votes
1 answer
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Connect via PoE an access point D-Link DAP-2610 using PoE out port of a Mikrotik Hex S [closed]

I have just bought an access point D-Link DAP-2610 and it does not come with a power supply so I want to power it via PoE using eth5 of my Mikrotik Hex S. When I plug in my device, RouterOS in Winbox ...
Ángel Carlos del Pozo Muela's user avatar
2 votes
1 answer
856 views

PoE-safe Cable Tester

We use a lot of midspan PoE injectors here, rather than PoE switching1, and I recently burned out my third cable tester in the last 2 years by accidentally plugging into a line with an active injector....
Joel Coehoorn's user avatar
2 votes
0 answers
4k views

Cisco AIR-AP1852i-E-K9 stuck in "waiting for uplink[...]" after startup

I pulled an old cisco AP from a shelf today at work to test something, and after starting up and connecting with PUTTy, i was greeted with (after startup), this - repeating over and over: [*02/16/...
Flying Thunder's user avatar
0 votes
1 answer
108 views

PoE only data and power over network

Is ethernet(PoE) the only (power and data) over the network. I did google this I'm dyslexic and dysgraphic so English I tryed
kc0hwa's user avatar
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1 vote
1 answer
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Ubiquiti APs on manged or unmanaged switch?

I have three APs, one UAP-AC-IW and two UAP-AC-LITE. I have a Netgear Smart Managed Plus Switch, mainly for VLANs with plenty of open ports. I need to either add an unmanaged POE switch or a POE ...
alex's user avatar
  • 113
-1 votes
2 answers
208 views

Is this scheme- An Ip camera network completely isolated from rest of Intranet

IP camera network completely isolated from rest of the Intranet work and for connecting each IP camera at mutually 900 m TO 1.5 km distanc to switch near NVR about 800 to 1.5 km from each IP camera ...
stacklooker's user avatar
0 votes
1 answer
4k views

POE negotiation between IEEE PD and the POE Switch?

I know that there happens a negotiation between the IEEE PD devices and directly connected POE Switch through CDP or LLDP protocols. But if for some unknown reasons, if the CDP/LLDP is disabled on the ...
Abdul Tayyeb's user avatar
4 votes
2 answers
269 views

C3560CX-8PT-S UPOE

I have a C3560CX-8PT-S sitting in the office which I know little about. It states that it can be powered by the wiring closet switches. Would anyone with experience in using UPOE to power switches ...
Jason Alcock's user avatar
1 vote
1 answer
8k views

HP ProCurve 2520G Switch not accepting HP transceiver SFP

I first tried a non HP optical transceiver, received the error: Not an HP Networking transceiver Called HP they said I need to order a HP branded optical transceiver part no 468508-002 so I did. $...
user3265051's user avatar
1 vote
0 answers
18 views

PoE solution for multi adapters [closed]

Currently, we are implementing around 20 Ubiquiti P2P units and I am wondering if there is any solution for replacing the original power injectors with any other easy to manage and arranged devices. I ...
user avatar
0 votes
1 answer
366 views

UniFi Switch US 8-60w with a UniFi AP-AC-LR

I've bought myself a UniFi AP-AC-LR and a UniFi Switch US 8-60w. Are those two devices compatible to use power over ethernet cable to link them? With kind regards
Brent Theunckens's user avatar
3 votes
1 answer
217 views

Is temperature sensor on zero enough to prove PoE Control Module is failed?

I'm probing an issue where 4 PoE cameras can't get powered on. Switch model Dell N2048P Series. The "P" at the end of the model stands for "PoE Enabled" so, this feature is/should be available. The ...
user avatar
4 votes
2 answers
6k views

PoE losses: Cat5e vs Cat6

Just a simple physics question: per this link, Cat5e twist rate is lower than that of Cat6, and Cat6 cables are (on average) thinner. A higher twist rate means a longer copper wire per length of cable....
user3371024's user avatar
1 vote
1 answer
207 views

Feeding a PoE capable device with variable power supply over TIA568 A cable (DC spares)

The purpose of such a variable power over Ethernet supply would be to test network equipment that are receiving power over PoE under condition of conditions of low voltage or current and determining ...
Mindaugas Bernatavičius's user avatar
1 vote
0 answers
65 views

How to design network with high availability in a multilevel small workplace [closed]

I want to create a network in my work 4 floors 50m2*4 workplace. Requirements are simple: Share internet ( < 20mb/s ADSL) while blocking someone from abusing download speed for long period. (...
Momen Zalabany's user avatar
3 votes
2 answers
2k views

Active POE Injector with passive POE Splitter

Can a passive POE splitter be used with an active POE connection (802.3af or 802.3at)? For example: an active POE switch provides power through the ethernet cable and on the other side a passive POE ...
ace's user avatar
  • 33
2 votes
1 answer
3k views

PoE Problem - Off / On / Off Cisco 2960

Running 2 new switches Cisco 3850 - stackwise 480. When I plug a PoE splitter into the switches it works fine. Cisco IOS Software [Everest], Catalyst L3 Switch Software (CAT3K_CAA-UNIVERSALK9-M), ...
Aidan Venn's user avatar
1 vote
0 answers
76 views

Internet not working [closed]

I have this types of network in my office. Recently we have moved to new i BSNL internet. My problem is when i bypass router and connect poe cable to computer internet is working but when i put ...
Prakash Pandya's user avatar
2 votes
1 answer
2k views

Verifying 802.3 auto negotiation

This is my setup: The Problem The end point, ethernet device B, is powered by the power injector but receives no data. Everything is connected using CAT5 cable. Ethernet device A signifies a GB/s ...
Niko_Jako's user avatar
2 votes
2 answers
235 views

How to debug an unstable connection in a P2P configuration

I have a setup where I have two computers connected to each other (C1 and C2). Both have a static IP and they know each others IP. C2 sends UDP packets to C1 and C1 receives and logs them. Seems ...
Steven's user avatar
  • 23
2 votes
2 answers
391 views

Why is there a warning on some PoE Switches, non-PoE might suffer damage?

To my knowledge, the PoE standard requires a Switch to be capable of detecting whether a connected device is PoE capable before delivering the full power via PoE. Why is there still often a warning, ...
t0bias's user avatar
  • 33
2 votes
2 answers
2k views

Join two PoE Splitters

So I was wondering about pulling more power down PoE, the default spec for most 802.3at switches is 25.5 watts per cable. I was wondering would it be possible to join two PoE cables in parallel to ...
Chris.Jenkins's user avatar
1 vote
2 answers
117 views

Strange POE Behaviour

So I have a 3650 poe switch from cisco and 2 7960 ip phones that use poe, I have one phone on a short patch lead and this phone powers on fine Now with the second phone, it has a 50m patch cable and ...
NickCarlt's user avatar
2 votes
2 answers
2k views

Changing ethernet wiring for Cisco pre-standard PoE

I have a set of 7912G IP Phones, which only accept Cisco pre-standard PoE. To save myself buying a Cisco switch, is it acceptable practice to change the wiring of my ethernet cables slightly and use a ...
JBithell's user avatar
  • 185
0 votes
1 answer
481 views

How to tell if our Dell PowerConnect 3524 has PoE? [closed]

First of all, I'm a web designer, not a network engineer, so simple answers are appreciated! We have someone coming in to sort out the network in the office and he has asked whether our Dell ...
AJT's user avatar
  • 101
1 vote
1 answer
13k views

Link status changes often plus PoE Fault

A HP ProCurve Switch is showing in the Logfile, that one Port is changing status from offline to online very often. I 07/07/17 05:06:04 00076 ports: port 12 is now on-line I 07/07/17 05:07:22 00077 ...
DOWJ's user avatar
  • 13
1 vote
1 answer
117 views

Network issue with IP cameras

The network consists of 7 UBNT G3 IP cameras a netgear 16 Gigabit port switch and a Windows 7 NVR that is running Blue Iris (I ran UniFi Video and Xprotect Essential with same results, so it is not ...
Andriy Lysak's user avatar
3 votes
3 answers
7k views

Can I connect a simple switch before or after a PoE access point?

I want to have a wired Internet connection before or after a PoE access point. Is that possible?
Kastan Pastan's user avatar
1 vote
1 answer
312 views

Split Cat6 port with hub to service 2 PoE IP cameras

I'd like to know if it's possible to split a Cat6 port in an existing wall using a hub or router. The hub or router would then service 2 PoE IP cameras
Tim Schumacher's user avatar
1 vote
1 answer
175 views

PoE cable defective?

Need some expert advice.. So some time ago I got water damage, my PoE switch was completely flooded. Since then, I noticed that I could not rotate my cameras anymore via Blue Iris (IP Cam soft), and ...
Sven's user avatar
  • 11
1 vote
2 answers
125 views

Mostly wireless campus vs. VoIP

We will be replacing our campus network in the next year or two, and we are leaning towards increasing the use of wireless since most people primarily work from laptops & mobile devices. Plus, we ...
RSS's user avatar
  • 210