The basic constraints of e-mail are a lack of gestures and facial expression that are present in spoken conversation. Unlike letter writing, however, e-mail is often almost conversational in tone because of the possibility of a more frequent response rate. Therefore, various angles must be considered when you compose an e-mail message. You must consider how you would interpret the message if you were to receive it. Often, humor is viewed as sarcasm, and excitement is not communicated.
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That limit is no more. Rockwell Semiconductor Systems , 3Com , and their associates were the first to bring us 56Kbps with K56flex and x2 technologies respectively. These two technologies, though based on similar principles, were incompatible. Both required its respective technologies be present at both the ISP and user locations. This meant that ISP's had to decide which technology to support based on educated market guesswork.