System and method for transporting data
First Claim
1. A private data network including some localized transmission medium, at least one master modem, at least one slave modem, and means for encoding, transmitting and receiving signals among said modems according to a data encoding and transmission scheme whereby a first analog frequency is selected to represent logical one by being both transmitted and received by a modem for a period of time equivalent to no more than one-half the bit period of said logical one and whereby a second analog frequency is selected to represent logical zero by being transmitted and received by a modem for a period of time equivalent to no more than half the bit period of said logical zero for the purpose of exchanging data throughout the area served by said localized transmission medium.
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Accused Products
Abstract
A private local area network (LAN) is created for use with a variety of transmission media for the purpose of exchanging data preassigned addresses, and control signals according to simplified protocols. The LAN members can consist of any combination of computers, electronic devices or terminals adapted for intercommunication via microprocessor-based modems which are capable of performing either master or slave functions within the LAN in accordance with their individual software designations. Each modem operating on the LAN has the capability of filtering analog noise, detecting/blocking digital data errors, operating within a wide range of appropriate line impedances, and both transmitting and receiving digital data at rates in the neighborhood of 85 kbaud in the form of frequency, or tone, bursts according to a hybrid ASK/FSK data encoding an transmission scheme. That encoding/transmission scheme consists of the selection of one frequency, or tone, to be both transmitted and received for a duration equivalent to no more than one-half the bit period of a "1" and of the selection of a second frequency to be both transmitted and received for a duration equivalent to no more than one-half the bit period of a "0".
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Citations
16 Claims
- 1. A private data network including some localized transmission medium, at least one master modem, at least one slave modem, and means for encoding, transmitting and receiving signals among said modems according to a data encoding and transmission scheme whereby a first analog frequency is selected to represent logical one by being both transmitted and received by a modem for a period of time equivalent to no more than one-half the bit period of said logical one and whereby a second analog frequency is selected to represent logical zero by being transmitted and received by a modem for a period of time equivalent to no more than half the bit period of said logical zero for the purpose of exchanging data throughout the area served by said localized transmission medium.
- 6. A private data network consisting essentially of a localized transmission medium, at least one master modem connected to a network-controlling computer, a plurality of slave modems separately and individually connected to different electronic devices or terminals related to said computer, and means for encoding, transmitting and receiving signals among said modems according to a data encoding and transmission scheme whereby a first analog frequency is selected to represent logical one by being both transmitted and received by a modem for a period of time equivalent to no more than one-half the bit period of said logical one and whereby a second analog frequency is selected to represent logical zero by being both transmitted and received by a modem for a period of time equivalent to no more than one-half the bit period of said logical zero for the purpose of exchanging information and control signals throughout the area served by said localized transmission medium.
Specification