Second , examine your computer carefully. Seek professional help in upgrading your computer. This is the Minimum acceptable. Whatever computer you have, the easiest way to increase speed is to purchase a 56K v.90 technology modem. If you are still utilizing a 386 machine, we recommended that you not invest in upgrading, because computers are most affordable these days.
Perfect conditions means a perfect telephone line, and it is next to impossible to obtain one.
Remember, telephone lines run for miles, below ground, above on telephone polls, and all exposed to weather. Some new lines, but most old. A little static to a lot of static. And this is about twice the speed a 28.8K modem will connect. Unlike 56K analog, ISDN is a digital technology.