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The acronym “USB” is short for the term Universal Serial Bus, a hardware interface that was developed so that peripheral devices like computer mice, keyboards, printers, digital cameras, scanners, PDA's and MP3 players can be easily connected to PCs. Computer manufacturers first began to replace serial and parallel ports with USB ports in 1997; today, every PC on the market contains at least 4 ports for USB connections.

What are typical transmission speeds for USB cables?

Generally speaking, USB cables are classified into one of two different bandwidth groups: 1.1, which transfers data at a maximum rate of 1.5 Mbit per second, and 2.0, with a 480 Mbit per second data transfer rate. USB 2.0 is backward compatible with the lower data transmission requirements of 1.1, but the substitution can’t be reversed; 1.1 just can’t deliver the rate of data transfer that USB 2.0-rated devices need.

In addition to the bandwidth classifications listed above, USB devices can also be labeled in the following “speed” categories, which specify the amount of bandwidth they need to operate:

Low Speed: The “ low speed” rating indicates that a device requires minimal bandwidth (1.5 Mbit/s) to function, so it can be used in conjunction with either 1.1 or 2.0 USB cables. Joysticks, keyboards and computer mice are a few common examples of low speed devices.

Full Speed: Devices labeled “full speed” need a signal rate of 12 Mbit per second. Since this is such a common bandwidth requirement, all USB hubs on the market have been designed to support Full Speed. And even though the data transfer speed is higher, Full Speed – like Low Speed – transmits equally well via 1.1 or 2.0 USB cables.

High Speed: “ High speed” USB devices run at 480 Mbit per second, and require a 2.0-rated USB cable.

What does it mean when USB cables and devices are described as “hot swappable?”
The USB Implementers Forum, a non-profit organization otherwise known as the USB-IF, is the group responsible for promoting and supporting USB standards. Made up of companies that developed USB technology, the USB-IF includes notable corporations like Agere Systems, Apple Computer, Hewlett-Packard, Intel, Microsoft, and NEC. Within the USB-IF are four working committees: the Compliance Committee, the Device Working Group, The Marketing Committee, and the On-The-Go Working Group.

How many types of USB connectors are there?

USB connectors – and, by extension, USB ports – can be found in two different styles: type “A” (for hosts and USB hubs) and type “B” (for peripheral devices). In addition, USB plugs fall into three different size ranges: standard, mini, and micro. Here’s a general breakdown of how connector styles differ by size class, and the applications each is used for:

Standard USB: Standard is the original USB connector size, and the largest of the bunch. Standard-size “A” connectors have a long and extremely narrow rectangular shape (approximately 4mm x 12mm), while standard “B” connectors are still oblong, but with shorter and wider proportions (at roughly 7mm x 8mm, they’re closer to being square). Standard USB connectors are typically used with, well, “standard” peripheral devices like printers, keyboards, computer mice and scanners.

Mini USB: Developed for use with small, portable peripherals like digital cameras, cell phones, PDA's and MP3 players, Mini USB connectors feature a more compact and space-efficient design than standard USB connectors. Unlike standard A and B connectors, Mini A and B have very similar shapes; however, it’s possible to distinguish one from the other by the upper halves of their vertical edges: Mini A’s sides are straight, but Mini B’s are rounded.

Micro USB: In January 2007, the USB-IF approved the most space-conscious connector size to date: Micro USB. Micro USB connectors are approximately 50-60% smaller than mini connectors, and replace Mini USB in many new PDA's and Smartphones.

Neckband Headphones: Why Is This Design Becoming So Popular?

At some point during the past few years, you've no doubt noticed an intriguing new phenomenon. More and more people are sporting what can only be described as high-tech collars with headphones sprouting out the sides. Call them what you will—"neckband headphones," "behind-the-neck headphones," or even the more obvious "collar headphones"—but this distinctive modern style of in-ear and around-the-neck earphones is all the rage as of late. And if you haven't experienced them yourself, you may be wondering what all the fuss is about.

Ultimately, the success of neckband headphones boils down to three essential considerations: a unique combination of convenience, features and battery life unmatched by any other in-ear headphone design.

Your Headphones Are Right There Where You Need Them, When You Want Them

The first major benefit of neckband headphones is perhaps the most obvious, but it's worth pointing out. Given that the earbuds are hanging around your neck, mere inches from your ears, means you won't have to dig through your bag or your pockets when you want to listen to some tunes or take a phone call. And since virtually all neckband headphones connect to your smartphone or personal media player via Bluetooth, those two tiny little cords connecting the collar to the earphones are the only cables you need to worry about. That means no more rat's nests to untangle. Since those cables aren't extending from your head to your pocket, it also means fewer opportunities to snag them on a doorknob and rip your earphones out of your ears. Or worse yet, break the wires, rendering your precious audio purchase worthless.

That Neckband Headphones Are Full Of Surprises

While we all appreciate the lightweight and convenience of in-ear headphones, as well as the add-on features commonly found in many popular models these days, those two desires can conflict with one other. After all, the more electronics you pack into one of those little housings, the bulkier, heavier and more cumbersome it gets. That's the definition of defeating the purpose.

Housing all their electronics inside the neckband headphones allows for additional features, without dragging down your ears or increasing discomfort. These features include: