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Technology Stocks : Dell Technologies Inc.
DELL 133.78-0.1%Nov 14 9:30 AM EST
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To: John Koligman who wrote (24464)12/8/1997 12:51:00 PM
From: Meathead  Read Replies (1) of 176387
 
You are correct John. USB is already with us and should
heat up next year with OS support... 1394 Firewire is
a little further out but is not designed to replace
USB (sound familiar?<g>).

You should expect to see both USB and 1394 Firewire ports
on future PC's. Here are the main differences between
these two ports:

USB supports a low-speed, 1.5 Mbps (Mega-bits-per-second),
low cost version and a medium-speed, 12 Mbps, higher
cost version. USB uses 3.3-volt CMOS differential
signaling. Low cost peripherals requiring low bandwidth
are best suited to USB like input devices such as keyboards
and mice. USB is a supervised bus which requires a
host controller to handle all bus traffic. Conventional
USB topology does not allow direct peer-to-peer transfers
between peripherals, so operation of external peripherals
is not possible when the host computer is powered off.

1394 currently supports speeds up to 400 Mbps with future
definitions taking it up to 3.2Gbps. This makes
it more suitable for high-bandwidth peripherals, such
as color scanners and printers. 1394 uses 220-millivolt
CMOS differential signaling which is less than half the
power consumption of a SCSI device pin. 1394 is an
unsupervised bus that will permit peer-to-peer transfers
between peripherals without aid from the host computer.

MEATHEAD
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