One USB-C Cable to a 4K Room Display 40m Away: BYOD Extender Kit
How the EXT-USBCPD4K-40M carries laptop video, USB 3.2 peripherals and up to 100W charging to a room over one CAT6a cable.
The problem
In a classroom or a lecture room, the interactive panel is on the front wall and the presenter's laptop is at the lectern or the podium — often a long run apart. A modern laptop offers one USB-C port that is meant to do everything at once: send video, carry touch and camera data back, and take charge. Native USB-C cables do not reach across a room, so the single-cable idea falls apart the moment the panel is more than a couple of metres away.
Integrators have worked around this by splitting the signals — an HDMI extender for video, a separate USB extender for touch and the room camera, and a charger under the table. That is three cable paths to pull, three things to fault-find, and a touch layer that frequently drops because the USB extension was never rated for the camera and the panel together.
In corporate meeting rooms, healthcare consult rooms, hot desks and retail floors the same pattern repeats: a USB-C display or panel at the wall, the source somewhere else, and no clean way to keep the whole USB-C experience — video, data, touch return and power — on one link.
What changes with this product
The EXT-USBC2C4K-40M extends a full-featured USB-C source over a single CAT6a cable. The transmitter takes a laptop's USB-C input — DisplayPort Alt Mode 1.4a video, USB 3.2 Gen 1 data and Power Delivery 3.0 — and the receiver presents a full-featured USB-C output that carries DP Alt Mode 1.4a video and USB 3.2 Gen 1 data on one connector. An interactive display connects at the far end with a single USB-C cable, and its touch and hub return to the laptop.
It reaches up to 40m/130ft at 4K and 35m/115ft at 5K over CAT6a U/FTP 23AWG minimum, direct-wired. Video is up to 4K60 4:4:4 at 18Gbps with HDCP 2.3 and HDCP 1.x, with HDR, HDR10, HDR10+, Dolby Vision and HLG pass-through. USB runs at USB 3.2 Gen 1 and USB 2.0, up to 2.5 Gbps. Up to 100W of USB-C Power Delivery goes back to the laptop over the same cable when the transmitter is powered from its 24V/7.5A supply. Bi-directional 24V PoC means one supply powers both ends. The receiver adds two downstream USB-A ports and one downstream USB-C port at 5V/1.5A each, 3.5mm de-embedded audio and RS-232 pass-through.
Where it fits
K-12 Classrooms
The teacher's laptop sits at the lectern and the interactive panel is on the front wall. One USB-C cable connects the laptop to the transmitter, one connects the receiver to the panel, and the CAT6a run between them carries video, touch and charging — the panel reaches up to 40m/130ft away at 4K. Annotation and touch come back to the laptop, and the laptop charges at the lectern.
Higher-Education Lecture Rooms
From the podium to a USB-C interactive display or large panel, the link runs over in-wall CAT6a. RS-232 pass-through on the 3-pin phoenix connectors carries control to the room controller, and the ASCII API over the USB-C SERVICE port lets the help desk read link and signal status, so a room that has lost its picture can be triaged before anyone walks over.
Corporate Meeting & Training Rooms
A USB-C interactive display sits at the wall and the presenter's laptop is at the table. Video, touch, the room camera and up to 100W charging all travel on one cable to the display, with the camera plugged into a downstream USB port at the receiver so it returns to the laptop over the same link.
Healthcare Education & Consult Rooms
Clinician laptops present to a USB-C panel with touch for case review and teaching. The metal enclosures and ESD protection to IEC 61000-4-2 (±8kV air-gap, ±4kV contact) suit rooms that see constant traffic and frequent plugging and unplugging.
USB-C Monitors at Hot Desks
At a hot desk sitting some distance from a racked or docked laptop, a USB-C monitor connects to the receiver's USB-C OUT. The monitor's own hub returns keyboard, mouse and webcam back up the link, and the desk gets a single-cable connection to the shared source.
Retail & Experience Centers
USB-C touch displays on the sales floor are driven from a laptop or mini PC kept in the back room. The display connects with one USB-C cable at the receiver, and touch interaction returns to the source over the same link, keeping the compute out of public reach.
Typical setup
- Laptop USB-C (video, USB and 100W PD) → transmitter USB-C IN.
- Transmitter AV-USB3 OUT → receiver AV-USB3 IN over CAT6a — up to 40m/130ft at 4K60.
- Receiver USB-C OUT → interactive panel (4K60 with touch return).
- Receiver USB DEVICES 1/2 (USB-A) → USB camera or hub at USB 3.2 Gen 1.
- Receiver USB DEVICES 3 (USB-C) → USB flash drive.
- Receiver AUDIO OUT → amplifier (de-embedded audio); receiver RS-232 → control system.
- Transmitter AUDIO OUT → desk speakers (de-embedded audio).
What to check before you specify
Distances are tied to resolution: up to 40m/130ft at 4K and up to 35m/115ft at 5K. Both are over CAT6a U/FTP 23AWG minimum, direct-wired and straight-through — do not cross-connect the two ends, and terminate both ends to the same pin and colour order. The kit ships with one 24V/7.5A adapter; plug it into either box and bi-directional 24V PoC powers the far end. USB-C charging to the laptop, however, works only when the transmitter has its own 24V/7.5A supply.
The USB-C cable at each end is limited to 1.5m/4.9ft for USB 3.2 Gen 1 passive operation or 2m/6.6ft for USB 2.0 passive operation. A surge protection device is recommended to protect the electronics from spikes and surges.
Questions integrators ask
How far can it carry a 4K signal, and over what cable?
Up to 40m/130ft at 4K and up to 35m/115ft at 5K over a single CAT6a cable, U/FTP 23AWG minimum, direct-wired.
What USB data rate does it carry?
USB 3.2 Gen 1 and USB 2.0, with a transfer rate up to 2.5 Gbps. It does not support 5 Gbps operation.
Does each end need its own power supply?
No. The kit ships with one 24V/7.5A adapter; plug it into the transmitter or the receiver and bi-directional 24V PoC powers the far end over the CAT6a cable. USB-C charging to the laptop works only when the transmitter has its own supply.
What can I plug into the receiver?
The USB-C OUT connects to a display or monitor, and the receiver adds two downstream USB-A ports and one downstream USB-C port at 5V/1.5A each for devices such as flash drives or hard disks, plus a 3.5mm AUDIO OUT for de-embedded audio.
Where it sits in the line
- EXT-USBCPD4K-40M — 4K60 USB-C Extender Kit with USB 3.2, 100W Charging and HDMI Output, 40m. Choose it when the far-end display is HDMI rather than USB-C.
- EXT-USBCPD4K-70M — 18Gbps USB-C 4K60 HDBaseT 3.0 Extender with 100W PD, 70m. Choose it for a longer HDBaseT run with an HDMI output.
- SW-4X2PS-70M — 4×2 HDMI/USB-C 4K60 Seamless Presentation Switch with HDBaseT 3.0 70m Out. Choose it when several sources must be switched to a remote display.
- SW-5X1PS-70M — 5×1 HDMI/USB-C 4K60 Seamless Presentation Switch with HDBaseT 3.0 70m Out. Choose it to switch five inputs to one HDBaseT output.
