Local area network processing system
AssigneeNCR Corporation
InventorsDonald J. Girard, Frank Hines
Life of this patent
Estimating the term…
Abstract
A data processing system in which a host processor is connected to a plurality of remote processing devices over a common communication channel in which a number of the remote processors are commonly connected to a transceiver for transmitting and receiving data over the communication channel. Switching members on each of the remote processing devices select a pair of communication lines coupled to a priority resolving circuit for transmitting request to send signals and receiving clear to send signals, thereby enabling the remote processing devices to transmit and receive data over the communication channel.
Claims9
A data processing system for transmitting data between a first processing device and a plurality of remote processing devices including:
- a communication channel coupled to said first processing device;
- means coupled to said communication channel over a first communication line;
- priority resolving means coupled over a second communication line to said transmitting means for transmitting data to said transmitting means and coupled over a plurality of third communication lines to each of said remote processing devices for outputting a first control signal over one of said third communication lines to one of said remote processing devices enabling said remote processing device to transmit data to said priority resolving means over another of said third communication lines whereby said priority resolving means will transmit the received data over said second communication line to said transmitting means;
- and
- means coupled between each of said remote processing devices and each of said third communication lines for selectively connecting said one of said third communication lines to its associated remote processing device enabling said associated remote processing device to receive said first control signal from said priority resolving means and connecting said another of said third communication lines to its associated remote processing device enabling the remote processing device to transmit data to the priority resolving means whereby the priority resolving means will transmit the data over said second communication line to said transmitting means.
A data processing system comprising:
- a host processing device;
- a plurality of remote processing devices;
- a communication channel coupled to said host processing device;
- a transmitter member coupled to said communication channel for transmitting data to said host processing device;
- a priority resolving circuit coupled to said transmitter member and to each of said remote processing devices for outputting data to said transmitter member received from one of said remote processing devices for transmission to said host processor and for outputting a first control signal to said one of said remote processing devices enabling said one of said remote processing devices to transmit data to said priority resolving circuit;
- a plurality of communication lines coupled between said priority resolving circuit and each of said remote processing devices;
- each of said remote processing devices including a communication controller connected to each of said communication lines for outputting data over a first of said communication lines for transmission to said priority resolving circuit;
- and
- a plurality of manually actuated switching means mounted on each of said remote processing devices for selectively coupling its associated communication controller to each of said communication lines enabling said communication controller to receive said first control signal over a second of said communication lines and to transmit data to said priority resolving circuit over said first of said communication lines in response to receiving said first control signal over said second of said communication lines.
Dependencies are inferred from the claim text.