GC23, you got your Bps and bps all mixed up.
Bps = bytes per sec
bps = bits per sec
Most network speeds are stated in bps (bits per sec).
Use MBps for mega-bytes per sec and mbps for mega-bits per sec. 8 bits = 1 byte.
BTW, you won't get advertise speeds b/c those are theortical. There is always overhead (cell headers for atm, and packet headers for tcpip) so you'll get between 90% to 80% of stated speed.
Also,, I don't clearly understand what your service bandwidth is. I assume you have an adsl modem that can do 1500/384 kbps but what did you sign up for. Your isp can thottle your service through your modem or at the dslam.
Rainmanx