Transcription: Testing modems actually requires an amount of specialist test equipment. You might think that you could just plug them into the telephone line and make a call up to CompuServe or the internet, but actually there's no way of telling that the next time you repeat the call you'll get the same phone line. So what we use is a TAS line simulator which actually emulates the British Telecom network and it can emulate international, local or long distance calls and it can also emulate perfectly all the different kinds of noise and crackles that you get on a typical phone line. One of the reasons that s ...