Fast Ethernet combination chaining of auto-negotiations for mult

Electrical computers and digital processing systems: multicomput – Computer network managing

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G06F 1300

Patent

active

059220520

ABSTRACT:
A circuit and method for Ethernet combination chaining of auto-negotiation sessions for multiple physical layer capability. The present invention provides control circuitry for arbitrating between different physical layer circuit types that heretofore were allowed autonomous auto-negotiation processes because only one type of physical layer circuitry was applied at each end of a communication line. The present invention operates effectively within a hub of a local area network (LAN) communication system where multiple communication standards can be employed within circuitry that communicate at different ends of a communication line, e.g., twisted pair wire. In the environment of the invention, different types of physical layer circuits are integrated within communication devices. The invention provides a mechanism whereby, at each end of the communication line, a first physical layer circuit (e.g., the master) of a first type is allowed to auto-negotiate under the IEEE 802.3 standard with the other end of the communication line. On failure, the invention asserts signals causing a second physical layer circuit of a second type to auto-negotiate with the other end of the communication line. On failure again, if there are more than two physical layer circuit types, signals are asserted causing a third physical layer circuit of a third type to auto-negotiate, and so forth. If the last physical layer circuit's auto-negotiation fails, signals are asserted to return control to the master physical layer circuit which attempts auto-negotiation again, etc. This process continues until an auto-negotiation session is successful.

REFERENCES:
patent: 5610903 (1997-03-01), Crayford
patent: 5737108 (1998-04-01), Bunch et al.
patent: 5809249 (1998-09-01), Julyan

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