Importance

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Abstract

A system for enabling a host computer connected to a central station by a PSTN line to communicate with a second host computer or an Internet Service Provider (ISP) at a rate of 56 kilobytes per second. The system and hosts are operated using PCM-AM modulation. In one embodiment, where the central station is connected by a digital (T-1), to an ISP, the central station has a transmit clock and a receive clock that is slave to the transmit clock of the central station. A receiving section of the host has a clock synchronized with the transmit clock of the central station and the transmit clock of the host is synchronized with the receiving clock of the host. In another embodiment, communication of each host is conducted through PSTN lines to through a central station. The receivers and transmitter of both hosts are controlled by four clocks all synchronized to the first transmitter clock to initiate communication.

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First Claim