Questions tagged [power-over-ethernet]

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Can the USW-Enterprise-48-PoE-EU be used in Britain?

I need to purchase a USW-Enterprise-48-PoE as our infra, is already Unifi based. needs all 48 PoE ports. is short on rack space. USW-Enterprise-48-PoE As the USW-Enterprise-48-PoE-UK is currently ...
James Geddes's user avatar
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1 answer
179 views

Google Fiber WAN PoE passthrough two ports of managed switch?

I have a network configuration I would like to make happen, but I'm at a loss at what to call this odd setup, which makes searching quite difficult. I want to substitute the Google Fiber Networking ...
Jacob Jewett's user avatar
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1 answer
2k views

Can Ubiquiti UniFi PoE switch be used as unmanaged switch before adopting?

I know some managed switches can just be used as an unmanaged switch out of the box, but I have a site with a UniFi US-16-150W PoE switch which nobody knows anything about how it is/was setup or ...
codlord's user avatar
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What could cause a PD (access point) to not detect / pull power from a PSE (switch)?

I've got a PD (Powered Device : Ubiquity AirCube ISP access point) and a PSE (Power Sourcing Equipment : TP-Link TL-SG1005P switch). My understanding is that there are two ways of supplying power : A ...
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Can you damage a POE camera by plugging it quickly into a PoE switch over and over

Here is the context as I am a newbie at this - I got a free HP procurve 24 port POE switch from a nearby university. I have 12 cameras and long story short only 4 of the ports worked and the unit ...
Austin's user avatar
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Port negotiation issues, IP Radio tower

Got a ubiquity IP radio on a tower. One side of the link negotiates 1G but the other side has issues. It will negotiate 100Mb after a reboot every now and again (very random) but mainly sits at 10Mb....
patterned's user avatar
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1 answer
141 views

HP 3500yl-48G not giving PoE for Linksys SPA942

What can I have configured bad, when PoE on HP 3500yl-48G isn't working? The IP phone, Linksys SPA942, works at another PoE switch. Port configuration: PoE Enabled: Yes Maximum Watts: 17 Priority: ...
martin's user avatar
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ASUS RT-AC66N and PoE

I have an ASUS RT-AC66N router, and I will like to power the router by using PoE. The required power input for the router is 19V DC and 1.58A. But I haven't been able to find a solution where I'm sure ...
Diblo Dk's user avatar
  • 123
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1 answer
723 views

Two network adapters one gateway (UBUNTU)

I have a regular LAN adapter and a PoE adapter on my computer. I have an IP camera connected to the PoE port and on the regular one I am connected to my router. I can access my computer through the ...
Marcelo's user avatar
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4 votes
3 answers
11k views

Is it safe to connect a PoE injector switch to an ordinary PC?

Is it safe to connect a 24 V PoE switch output to an ordinary PC Ethernet input?
Toni Homedes i Saun's user avatar
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PD detection by passive PSE PoE (injector)

As I understand IEEE PoE standards, the PSE detects PoE capability of the connected device (PD) by measuring resistance on certain pairs and then negotiates its PoE requirements. Questions: Do ...
Overnout's user avatar
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2 answers
207 views

Can a 24V 1Gbps Ethernet port start operating in 100Mbps mode if it was exposed to 48V PoE?

I have heard that a situation where a 24V Gbit Ethernet port was not completely fried after being exposed to 48V current, but downgraded to fast Ethernet - 100Mbps. Question: I that possible and ...
Mindaugas Bernatavičius's user avatar
1 vote
1 answer
5k views

Plugging a POE Injector into a POE Switch

I have had this situation happen a few times where I found a device that was being supplied POE from an injector and that injector was plugged into a switch that is already providing POE. Obviously I ...
Cesar Bielich's user avatar
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1 answer
3k views

MikroTik Router: PoE-In doesn't work

I'm trying to install a MikroTik Cloud Core Router CCR1009-7G-1C-1S+PC. Our internet comes from an antenna and the main cable (from the antenna) first connects to a PoE injector (Phihong POE61U-560DG)....
Andreas Remdt's user avatar
1 vote
1 answer
108 views

Data throughput on gigabit POE PD link?

I am thinking about installing a POE switch in my gigabit network. I only need the switch to draw power from the network (PD link) but not supply it to other devices (so no PSE links). What impact ...
Stephen Winnall's user avatar
2 votes
0 answers
133 views

Data throughput/latency and poe performance in TPLINK TL-SG2424P 24 ports POE Managed Switch

I recently bought a TPLINK TL-SG2424P 24 ports POE Managed Switch. At the moment I'm going to use it with only a handful of access points, no more than 4 or 5, at least until the end of the year ...
A. Rama's user avatar
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2 votes
1 answer
3k views

PoE injector in series after PoE switch

I have a PTZ Security Camera that requires PoE+ (PoE class 4, IEEE802.3at). It requires 30 watt. I have an existing switch that only provides standard PoE/PSE 802.3af at a max of 15.4 watts. My ...
Kunsy's user avatar
  • 21
4 votes
4 answers
3k views

HP ProCurve 5412zl warm-boots on power failure while attached to UPS

My client's HP ProCurve 5412zl chassis switch reboots on occasion, despite being powered through four redundant power supplies and being under UPS protection. These reboots usually happen during a ...
ewwhite's user avatar
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Axis PoE Camera works with PoE-Switch but does not using various PoE Injectors

I am trying to get a AXIS M3007-P surveillance camera to work with Power over Ethernet. Connected to a D-Link DGS-1210-10P PoE Switch the camera just works perfectly fine. However, the D-Link Switch ...
t0bias's user avatar
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2 votes
1 answer
753 views

Is PoE 802.3af Compatible with 802.3at?

If I connect a device that is compliant with POE 802.3af (surveillance camera) to a device (switch) which is POE 802.3at. It will work?
user11490's user avatar
0 votes
1 answer
195 views

Passive PoE Router Fried Tester

Today I accidentally plugged my cheap master Ethernet test unit into my brand new router which had passive PoE enabled on the port. The tester went crazy and now skips pins. It will be cheap to ...
user2875165's user avatar
1 vote
1 answer
2k views

Is it safe to use PoE injector for routers that do not support PoE

We bought an Asus router n66U to be installed in a tourist bus along with a server. The bus has a inverter to supply a 220V AC. However, there can be abrupt power fluctuations specially during ...
Kartik's user avatar
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3 votes
2 answers
2k views

Can PoE kill unmanaged switches?

Two simple unmanaged switches have died in the same cabinet in two years, one at 18 months and one just today at six months. Both times we gradually experienced increasing intermittent verified ...
Whilom Chime's user avatar
3 votes
1 answer
2k views

Can I use Cat5e jacks and wiring for POE Cameras?

I have to connect 6 POE cameras to an NVR that provides the POE ports. The cameras will be located 100-200' from the NVR. The packages comes with 100' cables. I can run new cables, but I have some ...
PeterD's user avatar
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0 votes
1 answer
237 views

PoE from 2960 without Layer 1 Connection

I'm attempting to use a Cisco 2960-X (LPS-L) to provide power for a some Nexus 7 tablets (via a TP-LINK PoE Splitter). The issue is that without some actual device connected to the LAN port of the ...
Alex Miller's user avatar
4 votes
1 answer
11k views

What will happen if a PoE powered patch cable is plugged into a normal RJ-45 plug?

I have a couple PoE powered keystone jacks sticking out of a wall in a computer lab. We're going to remove /block the excess ones eventually, but for now I'm worried about somebody plugging a laptop ...
Libbux's user avatar
  • 295
0 votes
0 answers
1k views

Dell PowerConnect Power Over Ethernet randomly faulting

I have a dell PowerConnect 5524P that is having an odd issue. On a fairly regular basis, I check the status of the PoE system on my switch. The PoE ports almost always list their status as Fault, and ...
adear11's user avatar
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5 votes
3 answers
10k views

Effect of reversing a pair, in cat5 cabling (e.g. swapping stripe and solid)

Is there any practical effect of reversing solid and stripe, when wiring cat5 cables? But if I've got a cable where each pair is a pair but one end is flipped, will this make any practical difference ...
Bryce's user avatar
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3 answers
5k views

How can i measure the power consumption of a PoE switch?

I have to measure the power consumption behavior of switches which are powered with PoE and which also provide energy to other devices. How can this be done? regards
user1291235's user avatar
1 vote
2 answers
235 views

POE and AC power

Could there be any issues having both POE and AC power attached to a WAP? I'm curious because I found a few WAPs that had both...wondering if I should pull AC or just let it ride?
TryTryAgain's user avatar
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1 vote
1 answer
1k views

PoE switch to power Cisco Aironet 1200 access points

I have a draytek P2260 poe switch which can provide up to 15.4 watt of power to devices like IP phones. This switch is a 24-ports 802.3af PoE PSE However Cisco Aironet AP require 18.5 watts and at the ...
Ravi's user avatar
  • 115
3 votes
3 answers
3k views

Cisco SG 300-28P PoE switch appears to have damaged my domain server's network IF

I just replaced the old HP ProCurve switch with a new Cisco SG 300-28P managed switch. It has PoE on all ports. Everything works, except for my domain server that went offline and the network ...
cdonner's user avatar
  • 381
0 votes
3 answers
435 views

Power-over-Ethernet: Designing PSD with less than 48V?

I want to use Power-over-Ethernet for an IP Camera. On the host-side, which also is the PSE (Power Sourcing Equipment) I have my own hardware. On this hardware I just have 12V of supply voltage. ...
Toby's user avatar
  • 121
1 vote
2 answers
308 views

Power-over-Ethernet: 100 Mbps Device compatible with 1 Gbps Source?

I have an IP Camera, which is supports Power-over-Ethernet. The relating Ethernet Switch on the camera supports 100Mbs. Now when I want to support the camera with Power over Ethernet, will it be ...
Toby's user avatar
  • 121
1 vote
2 answers
6k views

Can I use 802.3at PoE clients in a 802.3af PoE switch?

I am about to buy and install a 802.3af PoE switch (probably a NETGEAR ProSafe FS728TP) that will power some Arduinos with PoE ethernet shields that is also 802.3af. How future safe is this? Let's ...
Johan's user avatar
  • 815
11 votes
2 answers
9k views

Is it possible for a gigabit switch to be PoE-powered? [closed]

I'm in need of a gigabit switch that can be powered via PoE, rather than AC power. There isn't any AC power in the area where it needs to be installed. Is this possible?
erikcw's user avatar
  • 697
6 votes
2 answers
4k views

Should PoE be turned off on ports not needing it?

This might be a silly question but we rolled out a large batch of VoIP Phones. Some due to port shortages have been bridged and PoE turned on. Management right now on the switch is tedious and we are ...
CogitoErgoSum's user avatar
2 votes
2 answers
2k views

Add power over Ethernet without new switches?

I need to power 16 IP phones over their Ethernet connections. I am in the process of changing our switches and only the phones need PoE, everything else is powered by mains cables. I have contacted ...
dannymcc's user avatar
  • 2,727
0 votes
3 answers
325 views

Are Cisco Small Business 300 series switches compatible with pre-standard PoE detection of old Cisco IP-phones?

I have a humble Cisco SF302-08MP managed PoE switch that I'm trying to use for powering an old Cisco 7902G IP phone. This phone uses the proprietary Cisco pre-standard (i.e., non-802.3af) PoE ...
joechip's user avatar
  • 668
2 votes
2 answers
10k views

PoE switch to PoE injector didn't fry the gear

Bit of an electrical dolt, but replaced an existing wireless radio with a new radio that was powered via PoE from the switch. Using same Cat5 cable, into the same PoE port on the switch, we couldn't ...
gravyface's user avatar
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1 vote
3 answers
11k views

Can a POE switch power devices if a non-POE hub or switch sits between the source and device?

I want to buy a single POE source and distribute it with cheap network hubs that do not have POE. Will this work?
chrism2671's user avatar
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8 votes
4 answers
9k views

Cooling requirements for POE switches?

Is there any difference between POE switches and normal switches when budgeting for cooling capacity for a network closet? Normally, when I'm thinking about cooling; I can look at the power draw of a ...
chris's user avatar
  • 12k
1 vote
1 answer
4k views

Is it possible to change the voltage on a single port on an HP ProCurve 2910al POE switch and how?

I have a couple of HP ProCurve 2910al POE+ switches at my company that we are primarily using to power our VOIP phones that run on 48V DC. However, I have one wireless access point that I need to run ...
goodman's user avatar
  • 219
1 vote
8 answers
4k views

PoE powered WiFi access point? [closed]

A few years ago, we made use of Apple Airport Extreme base stations mounted on the wall to provide a WiFi bridge to our LAN. This particular model makes use of 802.11af (Power-over-Ethernet, or PoE ...
Dennis Wurster's user avatar
8 votes
4 answers
551 views

Have you found Power-Over-Ethernet to be an effective solution for the enterprise?

I've noticed that quite a many VOIP phones support PoE. While the idea seems great in principle (no worrying about power adapters anywhere), have you found it to be effective for enterprise-wide ...
Alex Papadimoulis's user avatar