PDF says Northfields and upgraded.
So check your config file in the modem stats -
http://192.168.100.1 and then the Operation config link. Look at Upstream Max Traffic Rate - it's your upstream rate in bits.
If it says 5Mbps and not 1.75Mbps then the next suspect is your router - check to see if it has any QoS settings - if so turn QoS off and retest. I've seen a number of posts where upstream has been limited by old forgotten QoS settings.