ABSTRACT
Time division multiplexing turned out to be the best way to combine many telephone circuits on a single physical cable. At each level of concentration, a 64Kbits/sec telephone circuit is tied to a specific time slot. If the timing of a telephone call is disrupted, perhaps through being routed via a satellite or as a result of some malfunction, we might hear a slightly delayed echo that makes it nearly impossible to keep talking, or the whole conversation may be unintelligible. Synchronous communication is well matched to the voice data type.
