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Showing posts with label USB HUBS Explained. Show all posts
Showing posts with label USB HUBS Explained. Show all posts

Tuesday, 5 April 2011

How to Eradicate 3 Common Problems with USB Cables




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USB cables (or Universal Serial Bus cables) were designed to make connecting devices to your computer easier. Today there are many types of devices that can be connected to your computer using USB cables: printers, keyboards, mice, external hard drives, iPods and cell phones just to name a few. Problems with USB devices can make for a frustrating experience, but many problems can be attributed to problems with the USB cables themselves, not the devices. Here are the three most common problems that can occur with USB cables.

Problem #1: Not Connected Properly
This may sound too easy, but many problems with USB cables occur because they are not plugged in correctly. USB cables don't snap into place like phone cords or networking cables, so when you plug a USB cable in, it may not have connected properly. If you're having a problem with a USB device, the first thing to do is check the cables on both ends and make sure the USB cable is correctly inserted.

Problem #2: Wire Damage
Another common problem with USB cables occurs when the wires inside the cable are damaged. This can happen for a number of reasons. Maybe a pet chewed on a USB cable and damaged the wires. Alternatively, if a cable is unplugged from the socket over and over again by pulling on the cable rather than the connector, the cable can be pulled out of place causing the connection to be lost.

Problem #3: Wrong Speed
USB cables come in two forms: high speed (or USB 2.0) and low speed (or USB 1.1 or 1.0). USB 1.1 cables only run at speeds of 12 mbs (megabits per second) while USB 2.0 cables can run at 400 mbs. That's quite a difference! Visually there is no difference between the two, so it's easy to mistake a low speed USB cable for a high speed one. If your USB is designed to run at a certain speed, it's important to use the correct cable. While your device may work using the wrong type of USB cable, it may operate slower than it's supposed to. In some cases, it may not even work at all!

Nothing is more frustrating when something doesn't work the way you expect it to. USB devices are the same way. However, before you consider there is something wrong with the device itself, check the USB cable. Always check to see if the device is plugged in properly before attempting anything else. You'd be surprised how many times that solves your problem! If that doesn't work, and you suspect the USB cable is still the problem, try connecting the device to your computer using a different USB cable. Alternatively, you can connect a USB device that you know is working properly to your computer using the USB cable you suspect is not working properly. If the new cable works and the old one does not, then you may be dealing with a USB cable problem.




Kinds of USB Hubs Explained : How to


If you're currently in the market for USB hubs, you should know that there are two primary types: self-powered and bus-powered. The type of hub you purchase will ultimately be determined by the types of USB devices you own, as well as the number of components you wish to run. By learning the various differences between self-powered and bus-powered hubs, you will be able to make an educated decision when the times comes to select a suitable hub for your personal computer.

Bus-Powered USB Hubs

Bus-powered USB hubs, as their name implies, receive their power from your personal computer's internal power supply, also known as its "bus." So on the plus side, you will not have to plug them into electrical outlets, as your computer will supply them with all the power they require. Bus-powered hubs are recommended primarily for people who intend to run no more than a few USB devices at once. Connecting too many devices to a bus-powered hub is liable to put a strain on your computer's power supply and result in a lackluster performance from both your USB devices and your PC. Gaming devices like controllers and joysticks, as well as USB devices that don't require very much power, tend to work well with bus-powered hubs. However, USB devices that require a good deal of power to function, such as external hard drives, external disc drives, printers and scanners, may not perform to their full potential when connected to a bus-powered hub. In addition, bus-powered hubs tend to be very poor devices out of which to run wireless keyboards or wireless mice. If one hub is not enough to accommodate all of your USB components, keep in mind that running a bus-powered hub out of another bus-powered hub is an absolute no-no, as it would require more power than most internal power supplies are capable of putting forth. Still, if you're only interested in running a few small-scale USB devices, a bus-powered hub may be right up your alley.


Self-Powered USB Hubs

Unlike their bus-powered counterparts, self-powered hubs rely on AC adapters to supply them with power. After you've connected the adapter and securely plugged your self-powered hub in an electrical outlet, the hub will be able to generate its own power. Because of this, self-powered hubs are generally able to run more USB devices than bus-powered hubs. Additionally, self-powered hubs won't slow down your computer's performance, even if you're running multiple USB devices at once. Self-powered hubs are also better equipped to handle heavy-duty devices like printers, scanners, external hard drives and external disc drives. Self-powered hubs are also ideal for running wireless mice and wireless keyboards. Most PC manufacturers recommend that you purchase a self-powered hub in order to get the best performance from your PC and USB components. Apple, in particular, highly encourages iMac owners to look into self-powered hubs if they're interested in running USB devices.

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