MCCI Sells a $795 USB4 Switch for USB4 Product Development

The USB4 specification was officially released last September with the new standard promising speeds of up to 40 Gbps and up to 100 Watts power delivery over USB-C connectors.

MMCI is now offering a 2:1 USB4 switch, the first computer-controlled USB4 mux according to the company, that can control 1 or 2 products up to 20 Gbps. Model 3141 USB4 Switch is not designed for consumers, as there aren’t any USB4 devices around at this time, but for electronics designers, firmware and software developers to enable them to test & debug their USB4 implementations.

USB4 SwitchMCCI Model 3141 USB4 Switch key features and specifications:

  • USB Specifications/Features
    • USB4
    • Thunderbolt 3
    • USB 3.2 gen2 (x2 and x1), gen 1 (x2 and x1)
    • USB 2.0 high speed, full speed, and low speed
    • USB Power Delivery
    • VCONN-powered devices (up to 0.5A)
    • Alternate modes like DisplayPort.
  • 2:1 switch, connecting two USB Type-C receptacles to a single Type-C plug
  • Transparent connection between SUT (System under Test) and DUT (Device under Test) when in the connected state.
  • Impedance-controlled, low loss USB data path.
  • USB4/Superspeed signals are switched by PI3DBS16212 diodes supporting up to 20Gbps
  • Texas Instruments TUSB221 1:2 High-Speed USB Multiplexer/Switch for USB2.0 signals.
  • Maxim Integrated’s MAX14589E analog switches for CC lines and SBU signals
  • Handles up to 20V and 5A on VBUS
  • AVR 32U4 CPU with open-source Arduino BSP and firmware.
  • LED’s for connection indication, and for cable orientation on receptacles (normal or flipped).
  • Controlled and powered via USB micro B connector.
  • Dimensions – 31 x 31mm

Beside not supporting 40 Gbps, the device has some other limitations such as VCONN powered devices drawing up to 0.5 A of power only, and lack of support for automatic Type-C cable flipping.

USB4 Connection Exerciser
Click to Enlarge

A photo of the board shows it’s copyrighted by Microsoft Corporation, so I guess Microsoft may have commissioned MCCI for the design, and the USB4 switch can be tested with Windows Hardware Lab Kit (HLK) to ensure compatibility with your Windows (10) devices. The Model 3141 USB Switch is also controlled over the micro-USB port by a test control computer running Windows and the Microsoft MUTT ConnEx-C software package.

The company explains that long-run randomized switching on a USB Type-C port helps to expose bugs in the hardware-firmware-software stack on both hosts and devices, and can easily reproduce connect/reconnect event with the control program without having to physically manipulate cables.

MCCI Model 3141 USB4 switch can be purchased for $795, and more information may be found on the product page.

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9 Replies to “MCCI Sells a $795 USB4 Switch for USB4 Product Development”

    1. Devices like this are expensive for USB 2 and 3 too and there are no clones of those on taobao. The reason it’s expensive is because it’s low volume test equipment. The guys using this will be on hundreds of dollars a day so it’s not worth wasting their time building sometime like this from scratch.

      1. That may be one of the reasons why too few vendors test their devices and that we sill find so many bogus implementations even of USB2 in 2019. Just like thermal designs in comsumer products started to improve when cheaper thermal cameras became available, we can expect that reliable USB products will be the norm when affordable testing equipment is available.

        1. I was trying to work out why only cp2102 usb->serial would work on some USB host I was working with for months. It turned out to be an issue with the PHY calibration that I worked out by disassembling the firmware of another chip from the same company. TL;DR; if something that could capture and analyse USB (especially something that isn’t just a USB PHY spying on the bus at the data level) was less than $1K I could have saved a lot of time messing around and I maybe agree with you on the small scale/hobbyist stuff. But a $10K or more tool is nothing if you’re wasting your highly paid guys on stuff that would be obvious by poking at it for 5 minutes with the right tools.

          1. I totally agree on your point and have always been following the same practice, even repurposing expensive hardware to suit my needs. E.g. I have no problem stealing the power supply from a $500 PC if it can save someone one day of thumbs twiddling, even if that signs the PC’s EOL. In the case above, I don’t see the added value.

            I mean, they’ve apparently done a pretty generic USB switch from pretty generic and dirt cheap hardware. They’d sell it $15 they’d sell it in hundreds of thousands of copies to many users, they’d make way more revenue and it would still serve their main target at the same time. For me it’s like selling a USB-serial converter at $800 just because obviously only expensive professionals use a serial port! Nowadays you can get one for $1 or less and millions of copies are sold everywhere all the time. Thanks to this it costs nothing to add a console to any device now.

            So yes, their risk is that some companies just copy the design, make their own consumer USB4 switches sold for $10, offering exactly the same characteristics, and professionals will then have no reason to buy this genuine one for 80 times the price.

          2. >They’d sell it $15 they’d sell it in hundreds of thousands of copies to many users,

            I doubt it. These things are used for doing stuff like USB compliance testing.. there are not thousands of people out there doing that sort of work.

            >For me it’s like selling a USB-serial converter at $800 just because
            >obviously only expensive professionals use a serial port!

            Does that usb->serial converter have isolation on the USB side? isolation on the serial side?
            If it’s just a generic one well maybe they won’t pay $800 but they might pay $30 – $50 for an official FTDI lead from digikey with overnight shipping instead of waiting 2 weeks for module off of banggood to turn up.

            >Nowadays you can get one for $1 or less and millions of copies are sold everywhere all the time. ?>Thanks to this it costs nothing to add a console to any device now.

            That’s because there is a market for those things. Try finding one that has isolation so that it can be safely used to debug a board sitting in the middle of other boards with exposed mains voltages etc. Finding ones that can be used for 1.8v logic levels is also a pain and even worse lot of the really cheap cp2102 modules have a design flaw that makes the logic 1 level 4.3v instead of 3.3v.

            >make their own consumer USB4 switches sold for $10,

            Maybe when USB4 is widely available.

            TL;DR; If you’re just messing around and have time to burn build/buy from China. If you can just expense the tools you need as long as it’s not so expensive it won’t get approved who cares?

          3. I’d say we are ahead of usb4 being noticed on consumer market at least for 2 years. So it’s starting on computing devices for mass market prices and storage, gpu or server bandwidth requirements >= 2022?
            (Reading at 1.1v serial output could do a voltage divider.)

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