Allright, then, why can I connect at 53K?
Using the 56K standard, upstream modem speed (that’s the speed FROM your PC to any other PC) is typically capped at 33.6KB. But, this standard allows for digital compression of the downstream modem speed. (Downstream is from the ISP to your computer.) Since most of your activity (browsing, downloading, etc) makes more use of the downstream direction, the 56K standard accelerates the downstream side of the connection only. Not all modem software drivers work exactly alike, so yours may be reporting the upstream speed.