Today i saw ads in newspaper about BSNL Wimax in gujarat.Atleast we have got in Vadodara.Prices are bit high

SPEED CHARGE(MONTHLY)
256kbps-8 mbps Rs 2000
1 mbps-8mbps RS 4000
2 mbps-8 mbps RS 15000 !

what does 256 kbps-8mbps exactly mean?