In reality, the avg speed of 802.11b(your BEFW11S4) is around 6mbps
within your LAN. This is from 1 wireless client to another wired
client. Any additional wireless clients will degrade this performance.
The realistic avg speed for 80211.g(wrt54g) is 11mbps with the same
constraints as 802.11b. In addition, if at any time, an 802.11b-only
client connects to a 802.11g access point, ALL wireless client speeds
for that access point will be reduced to 802.11b speeds i.e. 6mbps.
Also, the range at this higher speed for 802.11g is not as far as
802.11b and will degrade back to 802.11b speeds or less as you get
farther away.
So basically, if you have any clients with 802.11b only cards, don't
bother, you will waste your money. And if I were you, I'd wait until
the 802.11n/MIMO standard is complete and upgrade then.
-Kevin
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