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3
votes
2answers
104 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 ...
2
votes
1answer
237 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 ...
0
votes
1answer
43 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 ...
3
votes
1answer
897 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 ...
0
votes
0answers
197 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 ...
4
votes
3answers
885 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 ...
0
votes
3answers
328 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
1
vote
2answers
79 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?
1
vote
1answer
332 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 ...
3
votes
3answers
1k 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 ...
0
votes
3answers
177 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. ...
1
vote
2answers
197 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 ...
1
vote
2answers
844 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 ...
7
votes
2answers
2k 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?
6
votes
2answers
994 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 ...
2
votes
2answers
805 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 ...
0
votes
3answers
248 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 ...
1
vote
2answers
2k 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 ...
1
vote
3answers
4k views

Does each switch/hub off a POE switch need to be POE in order to relay power to devices?

I want to buy a single POE source and distribute it with cheap network hubs that do not have POE. Will this work?
7
votes
4answers
1k 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 ...
0
votes
1answer
754 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 ...
1
vote
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
votes
4answers
479 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 ...