Power and Connectivity Options: The Optimal Way to Power Your Meeting Room Tablet
A meeting room tablet needs two things from your building. Electricity, all day, every day. And a route back to the calendar it is displaying.
You can deliver both down one cable, or you can deliver them separately. That sounds like a detail for the electrician. It is not. It decides what your installation costs, how the panels behave when something goes wrong, and whether there is a visible plug on the wall of your boardroom.
It is also close to irreversible. Changing your mind after the walls are closed means opening them again.
Below, we discuss how Power over Ethernet works and where it costs you, how mains power with Wi-Fi compares, and which one suits the kind of office you actually have.
Why This Decision Comes Early
The order of decisions on a room display project runs like this. You pick the device. The device decides the enclosure. The enclosure decides the mount. The mount decides where the cable has to come out of the wall. And the power method decides which cable that is, who pulls it, and how much of your ceiling comes down.
Get to the mounting stage without having settled power and you will settle it badly, under time pressure, on installation day, with an electrician charging by the hour. That is how offices end up with a white cable stapled down a wall next to a very expensive panel.
Option 1: Power over Ethernet
Power over Ethernet sends electricity and data down the same cable. One run per door. The most prevalent cable is a Ethernet CAT 5/6 cable.
The advantages
One cable does everything. No socket, no plug, no second contractor. For a new build or a fit out this is the tidiest thing you can do, and the labour saving over pulling both power and data is real.
Wired reliability. The panel is not competing with anyone for airtime, it never fails to associate with an access point, and it is not affected by whatever the wireless team changes next quarter. Panels on wired connections are the ones nobody ever calls about.
Remote reboot. You can power cycle a panel by disabling and re-enabling the switch port. Somebody in IT fixes the third floor from their desk instead of walking there. Over four years across a hundred doors that adds up to a lot of walking.
Central power protection. Your comms room is almost certainly on a UPS. Panels drawing from the switch inherit that. A brief power cut on the floor does not blank every display in the building.
Better security posture, usually. A wired port can sit on its own VLAN with its own rules, and it does not need the network credentials that a wireless device has to hold.
The downsides
The switch has to support it, and has a budget. A PoE switch is more expensive than a plain one, and every switch has a total power budget across all its ports. A 24 port switch will not necessarily power 24 devices at full draw. Room panels are light loads so this rarely bites, but check the number rather than assuming.
Injectors are the cheap route and they need somewhere to live. If you have a perfectly good non-PoE switch, a midspan injector adds PoE to one port. The catch is that an injector is a small box that needs a socket and a home, and twelve of them in a comms cabinet is untidy in a way that irritates whoever inherits it.
Distance. Ethernet is specified to 100 metres end to end, and PoE loses voltage over the run. Keep to 100 metres, and stay under about 70 if you want headroom on a long or heavily loaded cable. Doors on the far side of a big floorplate can exceed this more easily than people expect.
Most consumer tablets have no Ethernet port. This is the practical one. If you are using standard Android tablets, PoE means a splitter that converts the run into data and a USB power lead, or an enclosure with PoE built into the frame. Both work. Both cost money per door, and a cheap splitter that outputs the wrong voltage will make a tablet charge slowly and run hot.
The cable is thicker. CAT 5e and CAT 6 are chunkier than a power flex, and the connector head is chunkier still. That head size decides the hole you need through a door frame or a partition. On a glass wall where the aluminium frame is your only route, it can be the deciding constraint. Flat CAT 6 helps and costs more.
It needs planning. PoE is only cheap when the run is going in with everything else. Retrofitting a data run to twenty doors in an occupied office is not a small job.
Option 2: Mains Power and Wi-Fi
The alternative is to treat power and network as separate problems. Power comes from a socket, a fused spur or an existing circuit near the door. The network comes over your wireless.
The advantages
Almost any building can do it. There is nearly always a power source near a meeting room door, because the door probably has card access or a maglock, and that means a live run already sits in the frame. Branching from an existing supply is dramatically cheaper than a fresh run from the riser.
No switch dependency and no distance limit. You are not counting metres to the comms room, and you do not need to buy anything from the networking budget.
Thin cable. A power flex is easier to conceal, easier to feed through a shallow frame, and less likely to force you into drilling glass.
Faster to install. No structured cabling, no patching, no port allocation. On a small job this is the difference between an afternoon and a fortnight.
It is the only sensible route in some buildings. Listed buildings, glass partitioned floors with thin frames, landlord restrictions on cable routes, or a floor where the ceiling void is already full. Sometimes PoE simply is not available to you.
The downsides
Two problems instead of one. You have solved power, and now you have to solve the network separately. The failure is that people solve the first properly and assume the second.
Corridors are the worst covered part of the floor. Wireless surveys get done in the open plan area where the people sit. Meeting room doorways sit in corridors, often behind lift cores, service risers, kitchens and plant rooms. A panel in a dead zone shows stale information and fails a booking at the exact moment somebody is standing in front of it, which is the fastest way to lose your users' trust in the whole system.
Measure at the door. Not near the door. At it, at mounting height, with the room door shut.
Client count, not bandwidth. People worry about the wrong number here. Panels poll for schedule changes, so the data per device is tiny. What matters is how many clients are associated with the access point covering that corridor. Once you are past roughly twenty panels in a building, talk to whoever owns the wireless network before you install rather than after.
Enterprise wireless authentication is where rollouts stall. If your corporate SSID uses 802.1X with certificates, getting a hundred tablets onto it is a project in itself, and some devices handle EAP-TLS badly. The common answer is a separate SSID for devices like these, on WPA2 or WPA3 with a pre-shared key and client isolation, kept away from the corporate network. Agree that with your security team early, because agreeing it late has stopped more rollouts than any hardware problem.
Two gotchas that catch nearly everyone. Modern Android randomises its MAC address per network by default, which quietly breaks any MAC allowlist you were relying on. And a captive portal, the sort that makes you accept terms in a browser, will stop a panel dead. Neither is hard to fix. Both are miserable to discover on go-live day.
A visible plug. On a boardroom wall or a client facing floor, a socket and a trailing lead is exactly the thing your designer will object to. It can be solved with a fused spur and an in-wall outlet behind the panel, but that is an electrician and a chase in the wall, and the cost gap to PoE narrows.
No central power protection. A power cut on the floor takes the panels with it. They come back on their own, so this is an annoyance rather than a fault, but it is worth knowing.
The Third Option Nobody Mentions
You can run mains power and wired Ethernet as two separate cables to the same point. It sounds like the worst of both, and usually it is, because you pay for two runs.
It earns its place in one situation. Where you want wired network reliability but the device or enclosure has no PoE option, and there is already a power supply at the door. You get the stable connection without buying a PoE switch or a splitter. Uncommon, but worth knowing it exists before you rule out wired networking entirely.
Office Scenarios
The right answer depends a lot on the building, not on the technology. Here is where each one lands.
1. A small office on a leased floor, finished walls, under ten rooms. Mains and Wi-Fi, comfortably. The per door saving on PoE would never repay the cost of the switch and the cable runs, and at that scale you can check the wireless at every door in half an hour.
2. A new fit out or a renovation, walls open. PoE, without much debate. The cable is going in alongside everything else, the incremental cost is small, and you will never get this opportunity again at this price. Draw the panels into the design and let the contractor pull the runs.
3. A large estate, fifty doors or more, occupied building. This is the genuinely hard one. PoE gives you remote reboot and wired stability, which matter a lot at that scale, but retrofitting fifty data runs is expensive and disruptive. The usual answer is to phase it: PoE on floors that are being refurbished anyway, mains and Wi-Fi on the rest, and accept a mixed estate. A mixed estate is fine. One management dashboard covers both.
4. Glass partitioned meeting rooms with slim aluminium frames. Measure the frame before you decide anything. If a CAT 6 connector head will not pass through it, PoE is off the table unless you are willing to drill glass, and the thin power flex wins by default.
5. A client facing floor or a boardroom. No visible plug. That means PoE, or mains into an in-wall outlet sitting behind the panel. Price both. The gap is smaller than you think once an electrician is involved either way.
6. Multiple sites with no local IT. Wi-Fi, generally. Sending a networking contractor to eleven regional offices to install structured cabling is a different order of project to shipping eleven tablets and a set of instructions. Reliability matters less here too, because there are two rooms per site rather than forty.
7. A heritage or listed building. You will take what you are given. Existing supplies, surface trunking where permitted, and wireless. Get the constraints from the building manager before you specify anything at all.
Comparison
Feature | PoE | Mains |
|---|---|---|
Cables to the door | One | One power run, no data |
Best time to install | During a fit out | Any time |
Cost on a small job | Higher, switch and splitters | Lower |
Cost on a large new build | Lower, one run per door | Higher, two problems to solve |
Works with standard tablets | Needs a splitter or PoE enclosure | Yes, natively |
Cable thickness at the frame | Thicker, connector head is the constraint | Thin and forgiving |
Distance limit | 100 m, ideally under 70 m | None |
Network stability | Wired, very stable | Depends entirely on coverage at the door |
Remote reboot | Yes, from the switch port | No |
Survives a floor power cut | Yes, if the switch is on a UPS | No, recovers by itself after |
Visible plug | No | Yes, unless you fit an in-wall outlet |
Main thing that goes wrong | Switch power budget or run length | Dead zone in the corridor |
Which to Choose
If the walls are open, use PoE. That is the whole rule and it covers most of the cases where the decision is easy.
If the building is finished and occupied, start from mains and Wi-Fi, then look for reasons to upgrade. The reasons that hold up are a boardroom or client facing floor where a plug is unacceptable, a corridor where the wireless genuinely cannot be fixed, and a door count high enough that remote reboot saves real time.
Whichever you choose, do the survey before you order. For PoE that means the run length from the switch to each door and the switch's power budget. For Wi-Fi it means a signal reading at every door, at mounting height, with the door closed. An hour of walking the floor with a laptop is the cheapest insurance on the whole project.
Wrapping Up
Power and connectivity are the least interesting part of a room display rollout and the part that most often goes wrong, because they are decided last by whoever is left in the room.
Take a marketing agency of about 80 people in a converted warehouse. Exposed brick, no false ceiling, no floor void, and six meeting rooms with glass fronts. PoE was the recommendation from their AV supplier and it was the wrong one, because every cable route would have been visible on a bare brick wall and the door frames were too slim for a CAT 6 head. They went with mains from existing spurs near the door access readers, thin flex inside the frames, and a dedicated wireless SSID for the panels. The whole install took a day. The one room that had a coverage problem got an access point moved three metres and that was the end of it.
The building told them the answer. It usually does, if you walk it first.
If you want a second opinion on a floor plan before you commit to a cabling design, send it over and we will go through the doors with you.
