Local area network with self assigned address method

Details Local area network with self assigned address method Local area network with self assigned address method

1985-03-21

1987-08-25

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

370 85, 370 92, H04J 324

Patent

active

046897860

ABSTRACT:
A local area network is disclosed including apparatus and methods for transferring data between a plurality of data processing resources ("agents") coupled to a cable. In the preferred embodiment, a plurality of agents are coupled to a common cable for data transmission and reception. An agent newly coupled to the cable dynamically assigns itself a unique address on the cable to which other agents may send data. Once an agent has been assigned a final address, it may then transmit to, and receive data from, other agents on the cable. An agent desiring to send data to a receiving agent follows a three step handshake, wherein the sending agent transmits an "RTS" signal and within a predetermined time must receive a "CTS" signal from the receiving agent. The sending agent then transmits a data frame within a predetermined time after the CTS signal is received. The failure to detect a return CTS signal within the predetermined time denotes a collision condition. Re-transmission is attempted using a linear back off method which is adjusted based on previous cable traffic history.

REFERENCES:
patent: 3787627 (1974-01-01), Abramson et al.
patent: 4430651 (1984-02-01), Bryant et al.
patent: 4602366 (1986-07-01), Takumi
patent: 4626846 (1986-12-01), Parker et al.

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