Multiplex communications – Diagnostic testing – Fault detection
Reexamination Certificate
2004-09-30
2009-10-13
Ngo, Ricky (Department: 2416)
Multiplex communications
Diagnostic testing
Fault detection
C370S401000, C709S223000
Reexamination Certificate
active
07602727
ABSTRACT:
A transmission repeater has a function of recovery to normal out of the deadlock state of auto-negotiation sequence between switches. The switches exchange auto-negotiation configuration codes via first and second transmission repeaters for a state transition. The first transmission repeater monitors auto-negotiation configuration codes among data transmitted from the opposed switch, and when detecting more than a predetermined number of configuration codes of auto-negotiation having been transmitted during a given period of time, determines that the auto-negotiation sequence between the switches is at a deadlock, and reports it to the second transmission repeater, which then disconnects optical signals from the sending end of the second transmission repeater to the switch for more than twice the propagation time of signals between the switches, thus resolving the deadlock between the switches.
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Mui Gary
NEC Corporation
Ngo Ricky
Sughrue & Mion, PLLC
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