General discussion related to Cable Modems, DSL, Wireless, Fiber, Mobile Networks, Wireless ISPs, Satellite, or any other type of high-speed Internet connection, general issues and questions here. Review and discuss ISPs as well (AT&T / SBC, BellSouth, Bright House, CableOne, Charter, Comcast, Covad, Cox, Cablevision / Optimum Online, TMobile, Verizon FIOS, Shaw, Telus, Starlink, etc.)
RWIN should be at least as big as the product of the bandwidth of the modem times the round trip time to the site. So, for your RWIN of 512 kilobits, if you have a 768 k connection, you should be fine so long as the ping is less than 660 ms.