Mar 01, 2013

What's the difference between 802.11g and 802.11n?

I have a pretty old wireless router for my home network that's a 802.11g standard. Would it be worthwhile to replace it with a new 802.11n router? What differences would I be likely to notice?

Here's a good background article:

IEEE 802.11

"The 802.11 family consist of a series of half-duplex over-the-air modulation techniques that use the same basic protocol. The most popular are those defined by the 802.11b and 802.11g protocols, which are amendments to the original standard. 802.11-1997 was the first wireless networking standard, but 802.11a was the first widely accepted one, followed by 802.11b and 802.11g. 802.11n is a new multi-streaming modulation technique. Other standards in the family (c–f, h, j) are service amendments and extensions or corrections to the previous specifications.
802.11b and 802.11g use the 2.4 GHz ISM band, operating in the United States under Part 15 of the US Federal Communications Commission Rules and Regulations. Because of this choice of frequency band, 802.11b and g equipment may occasionally suffer interference from microwave ovens, cordless telephones and Bluetooth devices. 802.11b and 802.11g control their interference and susceptibility to interference by using direct-sequence spread spectrum (DSSS) and orthogonal frequency-division multiplexing (OFDM) signaling methods, respectively. 802.11a uses the 5 GHz U-NII band, which, for much of the world, offers at least 23 non-overlapping channels rather than the 2.4 GHz ISM frequency band, where adjacent channels overlap - see list of WLAN channels. Better or worse performance with higher or lower frequencies (channels) may be realized, depending on the environment.
The segment of the radio frequency spectrum used by 802.11 varies between countries. In the US, 802.11a and 802.11g devices may be operated without a license, as allowed in Part 15 of the FCC Rules and Regulations. Frequencies used by channels one through six of 802.11b and 802.11g fall within the 2.4 GHz amateur radio band. Licensed amateur radio operators may operate 802.11b/g devices under Part 97 of the FCC Rules and Regulations, allowing increased power output but not commercial content or encryption.[1]"

You have higher potential speeds, with 802.11n. 802.11g = up to 54Mbps, whereas 802.11n can only support up to 700Mbps. Keep in mind, those speeds are best case. The other main thing is that you are more likely to get a strong signal with "n" if it is operating in the 5Ghz radio spectrum. vs, the 2.4Ghz spectrum used by all 802.11g and many 802.11n wireless routers. There are a lot of things that cause interference in the 2.4Ghz spectrum, so you could see a significant improvement if you have a source of interference in your home/office.  

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