• 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:
Hub
3m for low-speed devices
• Maximum length to any (high speed) device (5 external hub tiers):
Root Hub
• Connectors are friction/detent capture only, and may not be suitable for moderate or
high shock/vibration environments (without user-designed capture).
A Closer Look
5m
Hub
Hub
%
Device
30m
Hub
Hub
+Vcc
-Data
+Data
Ground
Hub
Device
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