Pre-N wireless
These products use the current draft version of the 802.11n standard. Compatibility with other draft-n and current 802.11n products is guaranteed by the Wi-Fi Alliance.
However, some features were added in later revisions of the spec, and it is possible that they will not work correctly. In most cases a firmware upgrade will solve any problems (consider if you feel confident performing such an update). Also, while 802.11n is designed to be backwards compatible with 802.11g, 802.11b and 802.11a, it had been noticed that -n can interfere with the operation of current 802.11b and g products.
The 802.11n standard is based on MIMO (multiple input, multiple output) technology, which takes advantage of multiple data streams. This concept was considered a problem until someone figured out how to harness these many streams of data to improve both throughput and range. Most of the major wireless networking vendors started offering routers and adapters based on the initial approved draft in mid-2007, while the final specification was released in October 2009.
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