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All
about USB!
Easier
Connections with USB:
By Raymond
WebTechGeek.com
If you're thinking of adding a new peripheral
to your PC, consider one that uses a Universal Serial
Bus connection. USB is faster and easier to use than parallel,
serial, or PS/2 connections, and it lets you plug in and
unplug devices without rebooting or reconfiguring your
PC.
The USB ports have been standard on most
PCs for a long. time now, many users have shunned the
new technology. Two factors account for their diffidence:
Some of the early USB systems suffered from a compatibility
problem, and until recently stores stocked relatively
few USB products. Over the last year, however, many new
USB peripherals, hubs, and converters have reached the
market, helping cement USB's reputation as the PC connector
of the future. USBasics: Daisy-Chain Gang USB connections
move data at up to 12 mbps, about 100 times faster than
a typical serial port, and over 4 times faster than the
speediest parallel port.
A USB mouse or keyboard won't work any faster
than its PS/2 or serial equivalent, but demanding devices
like printers and scanners can deliver substantially faster
performance. Because USB devices can be linked, or daisy-chained,
a single USB port can accommodate up to 127 devices. In
practice, you could probably link only half that number--but
that's still more than you'd ever need. All devices attached
to a USB port run off a single IRQ, avoiding one of the
PC's most formidable barriers to supporting multiple devices.
All the USB ports on your computer are part
of a single USB hub. The two USB ports on the back of
your PC--and any others on the case--are part of a single
USB hub. Every device directly connected or daisy-chained
to either port shares the 12-mbps bandwidth. Os if you
need more bandwidth for running multiple data-hungry devices
like high-end scanners and printers, you should add a
second USB hub.
