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why usb port communication is popular than parallel
port,when serial ports are slower than parallel
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Answer Posted / shweta
Introduction to USB
USB, which stands for Universal Serial Bus, is a high-speed
serial standard that, along with FireWire, has almost
totally replaced the ordinary serial and parallel standards
that have been used to connect peripheral devices to PCs
since the 1980s.
Click here! to go to the information on FireWire (IEEE1394)
on Page 2 of this article. You can use your browser's Back
button to backtrack.
In theory, up to 127 devices can be connected to a single
USB port on a computer's motherboard, using only one of a
computer's 16 or 23 Interrupt Requests (IRQs), either by
daisy-chaining them together, or by using a USB hub, which
itself has a number of USB ports.
Enter Interrupt Requests in the Google search box at the
top of this page (with its Web radio button enabled) to
find links that provide information about them.
Before going any further into this article, read this Q&A
on this site: I pushed the FireWire connector into the
FireWire port on my PC the wrong way around and fried the
iLink board on my camcorder. Use your browser's Back button
to backtrack.
Visit the Desktop PCs section of this site for information
on how to buy, build, repair, fix, and protect the various
types of desktop PCs.
Visit the Laptop/Notebook PCs section of this site for
information on buying and protecting them, and fixing
problems with them.
A USB hub can have its own power source, or draw its power
through the computer to which it is attached. To avoid
power problems, a powered hub is the best choice. Seven
peripherals can be attached to each USB hub. One of these
peripherals can be a second hub to which up to another
seven peripherals can be connected, and the second hub can
be attached to a third hub, etc..
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