Check that there are no peer to peer programs (e.g. Kazaa) running in the background as they can often saturate the upload channel if you leave your files to be shared.
Go to
http://192.168.100.1/P_log.htm
The password to enter is usually root and user is root
Look out for something a line "ntlhm120-silver.cm" in one of the cells in the table. The name may vary but the service levels AIUI are..
Bronze - 150k
Silver - 600k
Gold - 1Mb