TL;DR: Passive USB cables run out of road within a few meters. MSolutions’ own passive cables reach 5 meters for both USB 2.0 and USB 3.0, and past that you need an active extension method. Category-cable extenders carry USB over a single Cat6A run to 50 or 100 meters. Choosing between them comes down to one question: do you need the full 5Gbps, or is 480Mbps enough for the device you are extending?
Why USB has a distance limit in the first place
USB was designed as a desktop interface, not a building-wide one. The specification assumes a short run between a host and a peripheral sitting on the same desk, so the timing budget for a signal to travel down the cable and back is tight. Stretch the cable and two things work against you at once: the copper attenuates the high-frequency signal, and the round-trip delay eats into the time the host allows for a response.
This is why a long USB cable does not fail gradually in the way a long HDMI cable sometimes does. It tends to work, then not work, with very little warning in between.
The real limits, and where a good cable gets you
Two numbers matter here, and they are not the same number.
The first is the general ceiling for passive copper. MSolutions’ field guidance puts it at around 3 meters for USB 3.x (SuperSpeed) and up to about 5 meters for USB 2.0 (High Speed). Higher signalling rates are less tolerant of attenuation, so the faster standard runs out first.
The second is what a properly built cable actually delivers. MSolutions’ own passive USB cables reach 5 meters for both USB 2.0 and USB 3.0. That is the practical number to design around when the cable is coming from MSolutions.
| USB standard | General passive ceiling | MSolutions passive cable | Typical use in AV |
|---|---|---|---|
| USB 2.0 (High Speed) | ~5 m | 5 m | Keyboards, mice, touch panels, control interfaces |
| USB 3.x (SuperSpeed) | ~3 m | 5 m | 4K cameras, capture devices, high-resolution soundbars |
Either way the ceiling arrives quickly, and it arrives soonest for the devices that most often need to sit far from the host, such as a ceiling-mounted or wall-mounted conference camera.
What failure actually looks like on site
An over-length USB run rarely announces itself cleanly. The documented symptoms are data errors, dropped connections, peripherals not being recognised, and increased latency.
In a meeting room that presents as a camera that works during commissioning and drops out during a call, a touch display that stops responding after an hour, or a device that reappears only after someone unplugs and replugs it. Because the cable passes a continuity test, the run is often cleared and the fault is blamed on the codec or the room PC.
Four ways to get past the limit
There are four practical approaches, and they are not interchangeable.
| Method | Typical reach | Best for |
|---|---|---|
| Passive USB cable | Up to 5 m | Anything inside the specification. Cheapest and most reliable when it fits. |
| Active optical cable (AOC) | Long fixed runs | A single point-to-point run where a pre-terminated cable can be pulled. |
| Category (CAT6A) cable extender set | 50-100 m | Structured cabling that is already in the wall. A transmitter and receiver over one Cat6A run. |
| KVM extender | 100 m | When video and USB both need to travel to the same remote position. |
For most commercial installations the third option wins, because the building already has category cable in it. A transmitter sits at the host, a receiver sits at the device, and a single Cat6A run does the work.
Choosing an extender: bandwidth is the real decision
Distance is the specification everyone reads first, but it is usually not the one that determines whether the system works. Bandwidth is. MSolutions’ USB extenders split into two families, and the difference between them matters more than the meter count.
The MS-63 family carries full USB 3.2 Gen 1 at 5Gbps. The MS-6U family reaches the same distances but passes up to 480Mbps, which is USB 2.0 class throughput.
| Model | Reach over Cat6A | USB throughput | Connectivity |
|---|---|---|---|
| MS-63U1C | 50 m | USB 3.2 Gen 1, 5Gbps | 1x USB-C. PoC 12V, RS-232 |
| MS-63U1C-XR | 100 m | USB 3.2 Gen 1, 5Gbps | 1x USB-C. RS-232 |
| MS-63U1A | 50 m | USB 3.2 Gen 1, 5Gbps | 1x USB Type-A. PoC 12V, RS-232 |
| MS-63U1A-XR | 100 m | USB 3.2 Gen 1, 5Gbps | 1x USB Type-A. RS-232 |
| MS-63WP-H / MS-63WP-D | 100 m | USB 3.2 Gen 1, 5Gbps | Wall plate host and device units. RS-232 |
| MS-6U1C | 100 m | Up to 480Mbps | 1x USB-C. PoC 12V, RS-232 |
| MS-6U41A | 100 m | Up to 480Mbps combined | 4x USB Type-A plus 1x USB-C. Bi-directional analogue audio, RS-232 |
The rule of thumb is straightforward. If you are extending a 4K camera or anything that streams high-resolution video into the host, specify an MS-63 model and keep the full 5Gbps. If you are extending keyboards, mice, touch panels, or a room controller, the MS-6U models give you more ports and analogue audio for the same reach.
The MS-6U41A deserves a closer look. Four Type-A ports plus a USB-C port from one Cat6A run covers most of what a lectern or huddle space needs from a single extender, and it carries two-channel analogue audio in both directions on the same cable.
When video needs to travel too
If the remote end needs display output as well as USB, a USB extender is the wrong product. A KVM extender carries both. The MS-3RU extends uncompressed HDMI at up to 4K 60Hz 4:4:4 alongside USB-C data to 100 meters over a single Cat6A cable, using HDBaseT Spec 3.0. It also passes RS-232 and supports bi-directional 12V Power over Cable, so the far end does not necessarily need its own supply.
The full range, including the KVM and HDMI variants, sits on the USB-C and USB 3.x extenders page.
Do not skip the cable test
Every extender in this article depends on one thing being true: that the Cat6A run between the two units is actually good. A run that passes a basic continuity check can still fail under full bandwidth, and when it does, the extender takes the blame.
Testing the physical layer before handover is what separates a clean commissioning from a return visit. You can try the MS-TestPro interface free in your browser through the online GUI simulator, with no download.
Frequently asked questions
How long can a USB cable be?
The general passive ceiling is about 5 meters for USB 2.0 and about 3 meters for USB 3.x. MSolutions’ own passive cables reach 5 meters for both. Beyond that an active extension method is required.
Can you extend USB over an Ethernet cable?
Yes, with a USB extender set. A transmitter and a receiver send USB over a single Cat6A (or better) run, reaching 50 or 100 meters depending on the model. The cable carries USB, not network traffic, so the run is dedicated to the extender.
Why does my USB camera stop working on a long cable?
USB 3.x cameras run out of passive reach within a few meters. Past that you see dropouts, devices disappearing, and added latency, often intermittently rather than constantly, which is what makes it hard to diagnose.
What is the maximum length for USB 3.0?
Around 3 meters on a generic passive cable, and 5 meters on an MSolutions passive cable. With a category (CAT6A) cable extender such as the MS-63U1C-XR, USB 3.2 Gen 1 at 5Gbps reaches 100 meters.
Do USB extenders need power at both ends?
Not always. Several models support Power over Cable, so one power supply feeds both units across the category cable. The MS-63U1C and MS-63U1A support bi-directional 12V PoC.
Does a USB extender reduce speed?
It depends on the model. The MS-63 family maintains USB 3.2 Gen 1 at 5Gbps across the full run. The MS-6U family passes up to 480Mbps, which is ample for control peripherals but not for high-resolution video capture.
