1Gb Switch needed for Wireless N
I wouldn't be confident that 802.11n would have a throughput to match the 100 BaseTX (100Mbit Ethernet). With 100Mbit Ethernet you'll probably manage to get an effective throughput of 70-80% of the quoted bandwidth (i.e. 70-80Mbit). My experience of wireless is more like 50%, so 802.11n would have to be operating at a 160Mbit theoretical to outperform a 100Mbit port and cause a bottlekneck on the port. And don't forget the backplane of a 100Mbit Switch is much more than 100Mbit, so a bottlekneck there is unlikely. However, it would certainly be advisable to have at least one 1Gb port to link the Switch to other Switches (such as the Switches that have the servers connected to them), as you could end up with a bottleneck there if you connect it to the other switches on 100Mbit.
Has anyone see any throughput tests of 802.11n, which could confirm or refute this proposition?m I.e. are throughputs of over 80Mbit achievable?