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Questions tagged [power-over-ethernet]

43 questions
11
votes
2 answers

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

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
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8
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4 answers

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 deployment? My main concern is that all switches need…
Alex Papadimoulis
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8
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4 answers

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 device and assume that for every watt I dump into…
chris
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6
votes
2 answers

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 debating turning PoE on for all ports so we can…
CogitoErgoSum
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5
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3 answers

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 for 100BASE-TX? For 1000BASE-T? For POE…
Bryce
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4
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3 answers

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
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4
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4 answers

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 real power outage or during a brown-out or…
ewwhite
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4
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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 into the jacks -- not because of them being…
Libbux
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3
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2 answers

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 connectivity failures for all equipment (two linux…
Whilom Chime
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3
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1 answer

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 other options and I'm not an expert with POE so I…
PeterD
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3
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3 answers

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 interface appears to be dead. Windows says the network…
cdonner
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2
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0 answers

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 when we will change building and we will need quite a…
A. Rama
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2
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1 answer

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 question is whether I can us a PoE Injector such as the…
Kunsy
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2
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1 answer

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
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2
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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 the supplier of the phones and for 16 mains leads…
dannymcc
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