Whilst I'm not going to lose any sleep over this as I believe the iPod touch's rendering of the web page is probably a greater limiting factor (i.e. Internet is faster on my five year old Powerbook with 802.11b, both on the same router), it has got me wondering.
24Mbps is one of the defined speeds of 802.11g so I wonder whether Apple either hasn't/couldn't design in the full 802.11g speed because of Ae size/ rxer gain/ battery usage or whether in your circumstances that the iPod touch, because it almost certainly has a lower gain than your other systems for WiFi, is automatically switching to that slower speed mode.
If you change the WiFi channel to another do you get any change in the figures? Are there any sources of interference in proximity i.e. Bluetooth devices, some cordless phones, domestic microwave ovens, 3G mobile phones all of which work in a similar bands?
It's been a fair while since I studied communications systems in detail so I may have inadvertently taken this out of context but I found this quote on the IEEE site:
> {quote:title=http://standards.ieee.org/getieee802/download/802.11g-2003.pdf wrote:}{quote}
The ERP builds on the payload data rates of 1 and 2 Mbit/s, as described in Clause 15, that use DSSS modulation and builds on the payload data rates of 1, 2, 5.5, and 11 Mbit/s, as described in Clause 18, that use DSSS, CCK, and optional PBCC modulations. The ERP draws from Clause 17 to provide additional payload data rates of 6, 9, 12, 18, 24, 36, 48, and 54 Mbit/s.
Of these rates, transmission and reception capability for 1, 2, 5.5, 11, 6, 12, and 24 Mbit/s data rates is mandatory. Two additional optional ERP-PBCC modulation modes with payload data rates of 22 and 33 Mbit/s are defined. An ERP-PBCC station may implement 22 Mbit/s alone or 22 and 33 Mbit/s.
An optional modulation mode known as DSSS-OFDM is also incorporated with payload data rates of 6, 9, 12, 18, 24, 36, 48, and 54 Mbit/s.
(My emphasis.)
So I'm speculating that 54Mbps may not actually be required for 802.11g.
kind regards
mrtotes
