Wireless Hacks

802.11: The Mother of All IEEE Wireless Ethernet

While definitely showing its age, the original 802.11 gear still has its uses.

The first wireless standard to be defined in the 802 wireless family was 802.11. It was approved by the IEEE in 1997, and defines three possible physical layers: Frequency Hopping Spread Spectrum (FHSS) at 2.4 GHz, Direct Sequence Spread Spectrum (DSSS) at 2.4 GHz, or Infrared. 802.11 could achieve data rates of 1 or 2 Mbps. 802.11 radios that use DSSS are interoperable with 802.11b and 802.11g radios at those speeds, while FHSS radios and Infrared obviously are not.

The original 802.11 devices are increasingly hard to come by, but can still be useful for point-to-point links with low bandwidth requirements.

Pros

• Very inexpensive (a few dollars or even free) when you can find them.

• DSSS cards are compatible with 802.11b/g.

• Infrared 802.11 cards (while rare) can offer interference-free wireless connections, particularly in noisy RF environments.

• Infrared also offers increased security due to significantly shorter range.

Cons

• No longer manufactured.

• Low data rate of 1 or 2 Mbps.

• FHSS radios are incompatible with everything else.

Recommendation

802.11 devices can still be useful, particularly if you find that you already have a few on hand. But the ever falling price of 802.11b and 802.11g gear makes the old 802.11 equipment less attractive each day. The FHSS and Infrared cards talk only to cards of the same era, so don’t expect them to work outside of your own ...