yeah correct, you are on a the old bt system, whats your exchange, probably have not been upgraded to 21cn, 8128kbps is the most you will get unless you swop to a LLU provider or bt upgrade your exchange.
No offense but if you purchased this router to increase your speed you wont see any as your line is so short you will always get full sync for ADSL/ADSL2/ADSL2+