Questions tagged [power-over-ethernet]

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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 ...
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1answer
156 views

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 ...
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1answer
2k 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 ...
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2answers
280 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?
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16 views

MikroTik router port not working LED always on

I have a MikroTik RB4011 router with port 10 marked as a PoE-Out port. I have not yet used this port but now I have a TP-link AC1200 access point which has no power cable but requires PoE. On the ...
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3answers
9k 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?
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0answers
385 views

Dumb Switch to Smart Switch - Ports going up and down, what's up?

I just switched from a dumb switch 10/100 to a smart switch HP 1920-24G-PoE, and noticing ports going up and down randomly. I can't see any obvious reasons why this is happening so am curious if ...
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2answers
154 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 ...
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4answers
2k 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 ...
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1answer
1k 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)....
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1answer
88 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 ...
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1answer
10k 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 ...
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0answers
111 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 ...
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1answer
837 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 ...
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1answer
1k views

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 ...
2
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1answer
555 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?
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1answer
85 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 ...
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1answer
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 ...
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1answer
923 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 ...
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2answers
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 ...
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2answers
1k 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 ...
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2answers
8k 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?
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1answer
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 ...
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1answer
222 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 ...
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2answers
9k 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 ...
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0answers
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 ...
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3answers
6k 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 ...
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3answers
4k 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
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2answers
108 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?
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3answers
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 ...
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3answers
353 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. ...
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2answers
261 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 ...
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2answers
5k 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 ...
6
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2answers
3k 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 ...
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4answers
6k 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 ...
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3answers
321 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 ...
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1answer
3k 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 ...
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8answers
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 ...
8
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4answers
522 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 ...