HP Visualize c200/c240 PA-RISC Visualize Workstation Universal Serial Bus - Page 7
A Closer Look, Ground
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A Closer Look • Devices may be compound (have multiple functions) or contain hubs. • Devices are high-speed (12 Mbps) or low- speed (1.5 Mbps) only. Hubs are high only. • Differential Data Signalling (3.3V NRZI) • +Vcc is 500mA @ 5 Vdc • Devices may supply own power. • Vcc and Ground make contact before Data lines. • Maximum length of any single Hub-Device segment: 5m Hub 3m for low-speed devices Device +Vcc -Data +Data Ground • Maximum length to any (high speed) device (5 external hub tiers): 30m Root Hub Hub Hub Hub Hub Hub Device • Connectors are friction/detent capture only, and may not be suitable for moderate or high shock/vibration environments (without user-designed capture).
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A Closer Look
•
Devices may be compound (have multiple
functions) or contain hubs.
•
Devices are high-speed (12 Mbps) or low-
speed (1.5 Mbps) only. Hubs are high only.
•
Differential Data Signalling (3.3V NRZI)
•
+Vcc is 500mA @ 5 Vdc
•
Devices may supply own power.
•
Vcc and Ground make contact before Data lines.
•
Maximum length of any single Hub-Device segment:
•
Maximum length to any (high speed) device (5 external hub tiers):
•
Connectors are friction/detent capture only, and may not be suitable for moderate or
high shock/vibration environments (without user-designed capture).
+Vcc
-Data
+Data
Ground
Hub
Device
5m
3m for low-speed devices
Root Hub
Hub
Device
Hub
Hub
Hub
Hub
30m