my notes for wireless

| Standard | Frequencies | Range | Bandwidth | | --- | --- | --- | | NFC | 13.56 MHz |10 cm | 424 kbit/s | | Bluetooth | 2.4 GHz | 10 m | 1-2.1 mbits/s | | WiFi | 2.4, 5Ghz | 100 m | up to 250 mbits/s |

These are the standards in common use. NFC for payments. Bluetooth for headsets, peripherals and Beacons.

The original ethernet patent submitted by Metcalfe and others contained a provision for packets lost in the "ether." Ironically he cites the ALOHAnet as inspiration. You may remember from the talk that the ALOHAnet was wireless too.

Even more ironically the Distributed coordination function (DCF) used by 802.11 is designed to prevent collisions like the ALOHAnet is designed to prevent collisions rather than deal with them after the fact.