Multiplex communications – Wide area network – Packet switching
Patent
1988-08-09
1989-11-28
Safourek, Benedict V.
Multiplex communications
Wide area network
Packet switching
375121, H04J 322
Patent
active
048842664
ABSTRACT:
A local area network is disclosed including apparatus and methods for transmitting data between a plurality of data processing resources (agents) coupled to a cable. An agent desiring to send data to a receiving agent transmits a request to send (RTS) data packet which includes a control character requesting to either high or low speed data communication. Utilizing the teachings of the present invention, absent other predefined conditions a transmitting agent capable of high speed communication requests a high speed data exchange with the receiving agent. The RTS data packet itself is transmitted at low speed. Upon receiving the RTS packet, the receiving agent must transmit a clear to send (CTS) packet to the transmitting agent within a predetermined time after the receipt of the RTS packet. The CTS packet also includes a control character which either confirms that the data exchange will take place at high speed, or alternatively, a control character which requires a transmitting agent to use the low speed data rate. The transmitting agent, upon receipt of the CTS packet, generates and transmits a data packet to the receiving agent at either a high speed or low speed, depending upon the value of the control character with the CTS packet. The present invention further includes a status table maintained by each agent for tracking the address and communication capability of other agents coupled to the cable.
REFERENCES:
patent: 4747100 (1988-05-01), Roach et al.
patent: 4751510 (1988-06-01), de Saint Michel et al.
Chin Wellington
Safourek Benedict V.
Sun Microsystems Inc.
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