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USB 1.1 vs USB 2.0
Short answer
USB 2.0 adds high speed 480 Mbps while keeping low and full speeds. It uses 125 µs microframes, bulk packet up to 512 bytes, high‑speed hubs with transaction translators, and PING protocol, whereas USB 1.1 max speed is 12 Mbps with 1 ms frames and 64‑byte bulk limit.
Compare the USB standards USB 1.0/1.1 and USB 2.0.
| Feature | USB 1.0 / 1.1 | USB 2.0 |
|---|---|---|
| Year | 1996 / 1998 | 2000 |
| Speeds | Low speed 1.5 Mbps, full speed 12 Mbps | Low 1.5, full 12, high speed 480 Mbps |
| Frame time | 1 ms frames | 1 ms frames split into 125 us microframes in high speed |
| Packet size (bulk) | 64 bytes max | 512 bytes (high speed) |
| Transfer types | Control, bulk, interrupt, isochronous | Same four types, with split transactions and PING added |
| Hubs | Low/full speed hubs; no transaction translator needed | High speed hubs with transaction translator (TT) |
| Backward compatibility | - | Works with 1.1 devices and cables |
| Cable | 4 wires, shielded, 5 m max (full speed) | Same cable; maximum length 5 m |
| Added features | - | OTG supplement, better power management |
| Typical use | Keyboard, mouse, printers | Flash drives, cameras, external disks |
✓ Answer checked by Claude Sonnet 5.5
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