Your top adsl speed is based up on different of factors.
Some of them are:
d:
200 kbps
16 Mbps
ADSL
11 Mbps
1 Gbps
132 Mb/sec
45 Mb/s
T1 line
1.5 Mbps www.intelletrace.com
d. 802.11n
802.11n.
Depend of MCU clock divisor! Check datasheet.
People often confuse bandwidth and throughput. 802.11a and 802.11g are the two common standards that have a maximum bandwidth of 54Mbps. The actual maximum throughput you will see on a 54Mbps link will be 20-25Mbps.