#USB 3.1 And Its Disruptive USB Type-C #Connector USB is as ubiquitous a connector standard as you can find, but a new generation is coming with the 3.1 specification, which portends a future where USB offers a single-cable solution for audio, video, data and power on every conceivable platform and mobile device, or so the press materials claim. There are three pillars to the new spec: SuperSpeed USB (10 Gb/s), USB Power Delivery and the actual USB Type-C connector. USB Type-C Connector The changes that USB 3.1 bring are most obviously seen in USB Type-C, because theres an entirely new connector that fits into a port whether upside-down or right-side up, which eliminates the primary frustration with USB ports since they first appeared on devices years ago. Somehow, even though you had a 50/50 chance of guessing the orientation of your USB cable correctly, your failure rate was around 95 percent. (Or was that just me?) Its a simple fix; the new USB Type-C cables have a single CC wire inside, but each connector has two CC pins. When you plug the connector into a port, the CC wire can then make a connection regardless of the plugs orientation. The new connector is also physically quite small, measuring 8.4 mm wide by 2.6 mm high, making it a fine size for any device, be it a laptop, a slim 2-in-1 or a thin smartphone. Obviously, the existing USB Type-A connector is a bit too large to be elegantly used in many of todays svelte devices, but the smaller micro AB connector is potentially too flimsy. The USB Implementers Forum (USB-IF) believes that the Type-C connector solves both problems, and the connectors 10,000-cycle durability will be sufficiently robust to handle the rigors of use in our mobile computing lives. USB Type-C is compatible with previous iterations of USB, at least in that it supports all prior protocols from USB 2.0 onward, including the drive stack, capabilities and infrastructure. Obviously, though, the USB Type-C connector isnt backward-compatible physically; it will require adapters that have, for example, Type-C on one end and Type-A on the other, or one that offers Type-C and standard Type-B on respective ends. And so on. In time, all devices will phase out current USB ports in favor of Type-C ports, but that could take a long while. It also means that as users various computers and other USB-equipped devices age, theyll need a veritable stockpile of adapters to ensure that a slightly older device can connect with a newer one. Is that an inevitability of forward progress and change? Yes. Will it be a pain in the neck? Also yes. Further, its not entirely clear when those new ports will make their debut on new computers and peripherals, so its not as if you can time a purchase to coincide with USB Type-C connectors debut. However, the USB-IF believes well begin seeing devices on the market rocking the new connectors sometime early next year. SuperSpeed USB Setting aside the speedbumps on the road to change, theres plenty in the new USB spec to eagerly anticipate, not the least of which is speed. The new SuperSpeed USB boasts transfer speeds of 10 Gb/s and is designed to offer connectivity to everything from mice to storage to 4K displays. Thats a refreshing amount of speed and doubles that of the previous USB 3.0 standards 5 Gb/s, but even at 10 Gb/s, USB 3.1 lags behind Thunderbolt 2 and its 20 Gb/s. However, Jeff Ravencraft, President and COO of the USB-IF, made it clear that USB isnt losing a speed race here, because it isnt competing in one. We designed SuperSpeed USB so that when the time is right, if we need more performance, we can turn the dial up on it. Thats already been future-proofed into the cables and connectors and the spec, he said. We know that SuperSpeed USB will go beyond 20 Gb/s in the future. Theoretically, the USB-IF told us, USB SuperSpeed could actually hit speeds in excess of 1 GB/s (thats with a capital B, mind you), but Ravencraft said that blazing-fast speeds arent necessary or even practical for most everyday uses. For general consumer products out there today, he said, SuperSpeed 10 Gb/s is more than enough performance for the everyday user. USB Power Delivery 2.0 USB charging has been a handy tool for some time, but USB 3.1 comes with a boost in USB Power Delivery 2.0 (USB-PD) to 100 W. The new iteration of USB-PD promises backward compatibility to USB 2.0 and up, and it co-exists with USB Battery Charging 1.2. The new spec also allows for devices to negotiate power, so not only is there more potential juice to pump through the new Type-C cable, but two devices can intelligently decide which one powers which. For instance, you may have a workstation or a monitor that can deliver up to 100 W of power; and you might have a cell phone that will never be able to deploy 100 W of power, said Ravencraft. Theres a power delivery chip in the phone, as well as one in the hub in the monitor. The phone and monitor will see each other and define what capability the other has, and then theyll decide which device will provide the power and which will consume it. In that case, obviously, the phone should be the recipient of power from the monitor. Further, the power direction is switchable without the need to change the physical cable direction; its a two-way street with a traffic cop ensuring that everything flows properly. Further Building On USB 3.1 A powerful aspect of the USB 3.1 spec is that not only does it bring new capabilities on its own, it enables and even encourages further innovation from others through Alternate Modes (Alt Modes) and Media-Agnostic USB (MA-USB). In a nutshell, Alt Mode enables device makers to add more connectivity through the USB Type-C cable connector. This is an exciting capability, because OEMs can use Alt Modes creatively with devices. For example, VESA recently announced that it used Alt Mode to enable DisplayPort over the Type-C cable and connector. Of course, companies must acquire a standard or vendor ID (SVID) from the USB-IF for any implementation of Alt Mode. A final key feature of the new USB reality is MA-USB, a spec that was first published in March. MA-USB allows wireless devices and docking stations to communicate using the USB protocol — and all the goodness in the USB protocol stack and infrastructure — without a physical USB connection or cable, said Ravencraft. Notably, he added, Its been built to deliver wireless gigabit transfer rates while leveraging the USB infrastructure. Simply put, MA-USB enables the use of USB capabilities with no cable. It works over WiGig 60 GHz radios, WiFi 2.4 GHz and 5 GHz radios, ultra wideband radios and more, and its compliant and compatible with USB 2.0 and later, including SuperSpeed 10 Gb/s. The USB-IF worked closely with the WiFi and WiGig Alliances (which are now united) on MA-USB, building on the WiGig serial extension spec to ensure that it truly was media agnostic — that Ethernet, USB, WiGig, WiFi and so on would work over it. MA-USB is a clever bit of technology, really, as it shifts the hard work of discovery, association and authentication to the media it runs on top of. Security is an issue, of course, but MA-USB relies on the wireless medium to keep things locked down; thus, the signals security is as reliable as the medium sending it, for better or for worse. Taken together, all of the above technologies portend significant steps forward in the world of connectivity. Ubiquity can be difficult to come by with any new technology or specification (especially one that includes a new physical connector), but USB is so widely used that its just a matter of time before USB Type-C, USB SuperSpeed and USB-PD 2.0 land on mountains of new computers and peripherals.
Posted on: Thu, 02 Oct 2014 06:04:00 +0000
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