HP Visualize c360 PA-RISC Visualize Workstation Universal Serial Bus - Page 4

What is USB?

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What is USB? • U.S.B. stands for Universal Serial Bus (Logo: Icon: ) • Moderate speed 12 Mbps/sec. or 1.5 Mbytes/sec. • Multiple devices up to 126 - on a single resource set. • Cubicle span cabling 5m per segment, 30m max. with hubs • Flexible topology tiered star • Flexible power devices bus- or locally-powered, w/suspend-resume APM • Robust PnP, hot attach-detach1 • Low-cost 4 wire A • Idiot-proof Unique modular connectors: Style A (upstream, to hub/host): Style B (downstream, detach at device): Although USB ports have been shipping on PCs for over two years, widespread acceptance has been delayed by lack of B devices, which, in turn, have been awaiting: • O.S. support: Still waiting for "NT". Win95 support is problematic. • BIOS support: Most "USB" PCs have no USB console capability in BIOS. • Economics: Some PS/2 devices are still cheaper than USB during 1999. 1. Hot attach-detach is planned, but not fully implemented in the first HP-UX USB support.

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What is USB?
•
U.S.B. stands for
Universal Serial Bus (Logo:
Icon:
)
•
Moderate speed
12 Mbps/sec. or 1.5 Mbytes/sec.
•
Multiple devices
up to 126 - on a single resource set.
•
Cubicle span
cabling 5m per segment, 30m max. with hubs
•
Flexible topology
tiered star
•
Flexible power
devices bus- or locally-powered, w/suspend-resume APM
•
Robust
PnP, hot attach-detach
1
•
Low-cost
4 wire
•
Idiot-proof
Unique modular connectors:
Style A (upstream, to hub/host):
Style B (downstream, detach at device):
Although USB ports have been shipping on PCs for over two years,
widespread acceptance has been delayed by lack of
devices, which, in turn, have been awaiting:
•
O.S. support:
Still waiting for “NT”. Win95 support is problematic.
•
BIOS support:
Most “USB” PCs have no USB console capability in BIOS.
•
Economics:
Some PS/2 devices are still cheaper than USB during 1999.
1.
Hot attach-detach is planned, but not fully implemented in the first HP-UX USB support.
A
B