Intelligent Terminal for the Economical Use of Existing Narrow-Band Channels (Brief Case Computer)
A considerable discrepancy may be observed between the human processing capabilities of about 50 bit/s and the digital transmission rate of phone lines (about 5000 bit/s). On the other hand a phone call should be limited to about 3 minutes whereas man is capable of working some hours (e.g. 5) at a stretch (Fig.1). To compensate for this difference a local buffer of about 1–2 Mbit is usefull in a lot of applications.