Why cant I get higher speed on my 56K v.90 modem into some NAG sites?

A 56k v.90 modem is asymmetric by design, so download speed can be as much as 56k but upload speed will be only up to 33.6bps. For 56k to work, there must be only one analogue to digital (A/D) conversion in your local phone loop. Thus when modems at both ends are analogue, 56k speeds will never be achieved as most PSTN exchanges run digital routing.
Some NAG sites use analogue phone lines with Cisco and standard 56k modems, while most PCs dialing up use a similar modem. Between both the modems, it limits the download speed to about 33.6kbps maximum.
At the same time, many users might experience lower connection speeds due to other reasons, such as more poor line quality. These factors will also contribute to the quality and speed of the line.


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