Comment 27 for bug 201225

On a Dell D400 with Ubuntu 8.04 (kernel 2.6.24-19-generic) and
Broadcom Corporation BCM4309 802.11a/b/g [14e4:4324] (rev 03)

iwconfig also gives me:
Bit Rate=1 Mb/s

But doing the test http://www.speakeasy.net/speedtest/ gives me 5486 kbps.
I have 6mbps in theory, so this is fine, much more than 1 Mb/s.
For me 1 Mb/s seems to be just a wrong indication, not the actual transfert rate.