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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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1k views

Fix Ethernet 10/100 PoE cable with 7 out of 8 wires alive [migrated]

I have a 10/100Base-T ethernet cable with PoE IEEE802.3at/af installed in my concrete walls. Unfortunately only 7 out of 8 wires are alive. Wire #6 (green) was broken during construction works and ...
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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 ...
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1answer
43 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 ...
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Expanding network to attached building

I own a electronic design company, and recently moved into a new office space. We currently are setup in the front office, location "1" on my image. We also are converting a warehouse into an assembly ...
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2answers
81 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 ...
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1answer
1k 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. $...
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0answers
12 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 ...
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1answer
111 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
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1answer
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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 ...
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2answers
958 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....
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1answer
75 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 ...
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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. (...
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2answers
719 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 ...
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1answer
846 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), ...
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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 ...
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1answer
654 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 ...
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2answers
80 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 ...
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2answers
304 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, ...
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2answers
243 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 ...
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2answers
99 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 ...
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2answers
896 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 ...
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1answer
246 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 ...
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1answer
6k 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 ...
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1answer
92 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 ...
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3answers
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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?
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1answer
106 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
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1answer
100 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 ...
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2answers
107 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 ...
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1answer
407 views

POE - How does Mode A work?

I want to ask: how PD (Powered device) which run on POE Mode A separate Data and Power from pairs? How can it read data signal when power is on same pairs?
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2answers
106 views

Is a 10/100 switch sufficient for Voice?

Seems like a rudimentary question, but I'd like to use an "old" HP Procurve 2610 10/100 switch to provide POE connectivity to a new batch of ~25 deskphones. It appears as though a generic bandwidth ...
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1answer
516 views

Isolating ports on a Cisco Catalyst 2960-X Switch

I'm a bit of a newbie when it comes to networking, so excuse my ignorance for asking this. I did try to post this on the Cisco support forums, but kept getting told it was spam haha, so I hope this is ...
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4answers
453 views

Splitting WAP PoE connection for IP phone and laptop

I am not sure if this is the correct community, please let me know if I got it wrong. I am new to PoE. I've inherited a network where in one office there is a PoE wireless access point. This device is ...
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1answer
518 views

Flexibility of a UTP cable

Is there a metric/specification that shows flexibility/elasticity of a utp cable? I have to install a utp cable and it will have to go around some sharp corners. From what little experience I have ...
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1answer
53 views

PoE wireless bridge to PoE WAP? [closed]

Do I have this right? Not shown is the Wireless Bridge is aimed at an outdoor WAP across the yard, which is connected to a router, WAN, etc. I just want to see if I have it right on the receiving ...
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2answers
2k views

How many PoE ports can I use on a switch?

So, I want to connect 23 Ap's using PoE. The Switch is a 500w 24 port switch. May I use every single port with PoE without causing trouble on the Switch? Thanks! Edit: It's a UniFi switch of 24 ...
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1answer
95 views

WAP551 connected to WS-C2960X-24TD-L does not turn on, no PoE?

I just set up a new WS-C2960X-24TD-L, and I can access the switch via Network Assistant without any issues. However, when I plug in the WAP directly to the switch with the included cable, it seems to ...
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4answers
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Multiple POE over a single cable

I try to solve a problem using Power Over Ethernet technology to Power supply differents devices. I would like to avoid to buy new router and try to make it work without any expensive costs (if ...
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2answers
280 views

Ethernet wiring job done wrong

I am a systems administrator by trade. Though I have done a few wiring jobs, this is not a task that I claim to be a professional at, either by training or experience. However, ethernet wiring isn't ...
3
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1answer
624 views

HP 8206zl not delivering PoE 802.03at to Meraki AP

I'm having issues with a HP 8206zl switch not delivering PoE+ to a PoE+ device, a Meraki MR42 WAP to be exact. The WAP reports that it's operating in 802.03af fallback mode, which restricts it's ...
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2answers
76 views

PoE Query - IP Phones

My company have signed up for BT Business Broadband. We have IP Phones supplied by an external company. We have been led to believe that BT Business Broadband blocks IP Phones other than their own. Is ...
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1answer
627 views

Enable PoE on Cisco non-PoE switches

I would like to know whether is there any option to convert the non-PoE switches, Cisco 2960X-48TS-L and Cisco 2960X-24TS-L, to PoE Switches.
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Do I need a a special device to use an AP with POE with a home router? [closed]

I am setting up a small network for my office, I have a ZTE F660 router which is provided by my ISP and I am considering buying a couple of LINKSYS LAPAC1200 with POE access points. My question is, do ...
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1answer
981 views

How to enable PoE on HP ProCurve 2650

I own a Hewlett-Pacard ProCurve 2650 switch. I want to switch on power-over-ethernet on one of the ports. I have no idea how to do it, so my question is: Does the 2650 support PoE? How do I enable it ...
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1answer
505 views

PoE active splitter (802.3af) w/ passive injector?

Is it possible to use Active PoE splitter that does comply to 802.3af, with passive PoE injector? 802.3af does autonegotiate Does negotiation take passive PoE into account? Edit: Acording to: This ...
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2answers
113 views

IEEE802.3af/at PoE/PoE+ ethernet repeater to non-PoE laptop port for network access

This is my first post and I would LOVE some help. I'm in a situation where the customer owns our intranet/"VendorNet", which is a VLAN that represents all the servers and devices to which I need to ...
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2answers
1k views

Passive Power over Ethernet 802.3af Supported

I am trying to buy an Access Point which supports Passive Power over Ethernet, 802.3af. I don't understand the difference between the Passive Power over Ethernet and 802.3af. If the Access point ...
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1answer
5k views

Disable port Netgear GS728TP

I have some Netgear GS728TP smart switches with some CCTV camera that run over them. Occasionally these camera's freeze and require the network plug pulling on them to reset (They are PoE) Some of ...
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3answers
604 views

Can I auto-negotiate PoE class (brocade)?

If I use the inline power command in interface configuration mode, it will enable with the default PoE class, which is Class 0 or "UnknownClass". If I leave the default class can the switch ...
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1answer
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PoE AP is powered up but line protocol is down

The distance between AP and the switch is around 60 meters. The AP is powered up and SSIDs are broadcasted. But the Ethernet interface has line Protocol down. I have changed the RJ45 connectors on ...
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1answer
2k views

What is the minimum diameter for Power over Ethernet?

There are different PoE standards like 802.3af, 802.3at (PoE+) and 802.3bt (announced for 2017). In some articles I found the information that "CAT5e" is the minimum requirment for 802.3at. But "CAT5e"...