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USB in the near futur?

Posted on 1998-11-11
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Last Modified: 2010-04-27
Dear Experts

  I am about to make a major purchase decision concerning
USB hubs.I would like to know How important are
USB devices? Are they really fast?Can you really
hook about 100 device in a chain?Are the going to be
important in the near futur?Will they be more
common then SCSI devices in the near futur?

Do you have any reference on the web that talks
about that subject in particular?

Thank you
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Question by:fadih
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Expert Comment

by:jhance
ID: 1128849
Of course you're asking for an opinion about the future...

I think that USB is going to be significant and is going to replace both serial and parallel ports over time.  It will not replace SCSI as the performance is not even close.  Devices like modems, scanners, sound systems, printers, tape backup, removable drives, etc.  Basically anything that needs a low speed and low cost interface will eventually use USB.

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Author Comment

by:fadih
ID: 1128850
Dear Jhance
How slow are usb devices comparing to scusi? and comparing to serial?

Could you give me some references on the web ,please?
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Author Comment

by:fadih
ID: 1128851
Comparing to Serial and Pparalel port ,how faster is USB ?

Please give some reference on the web
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Accepted Solution

by:
jhance earned 200 total points
ID: 1128852
The USB spec can be obtained from www.usb.org:

http://www.usb.org/usb/developers/index.html



Speeds from slowest to fastest (note that some are bits/sec, others are bytes/sec):

SERIAL: maximum speed of 115K bits/sec (some special boards go faster)
PARALLEL: max speed of about 500K-1M bytes/sec
ETHERNET: 10M bits/sec
USB: 12M bits/sec
Fast Ethernet: 100M bits/sec
UDMA (UltraDMA IDE) 33M bytes/sec
SCSI 5M-80M bytes/sec
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