Auto-negotiation monitor system, repeating-transmission...

Details Auto-negotiation monitor system, repeating-transmission... Auto-negotiation monitor system, repeating-transmission...

2004-09-30

2008-11-11

Ngo, Ricky (Department: 2616)

Multiplex communications

Diagnostic testing

Fault detection

C370S244000, C370S245000, C370S246000, C398S006000, C398S011000, C398S012000, C398S016000, C398S017000

Reexamination Certificate

active

07450519

ABSTRACT:
Where each of switches opposed to each other detects optical-signal shutoff or optical-signal deterioration on the reception side of its port, the switch brings a link of the port down and outputs an auto-negotiation configuration code, as an LAN signal. Upon receiving the LAN signal transmitted from the switch, a repeating-transmission apparatus transmits the transmitted signal to an auto-negotiation monitor. The auto-negotiation monitor performs code analysis for the transmitted LAN signal. Where the auto-negotiation monitor detects that the transmitted LAN signal is the auto-negotiation configuration code, it notifies a monitor apparatus that “The switch detects a failure and the link is down.”, as an alarm.

REFERENCES:
patent: 4451916 (1984-05-01), Casper et al.
patent: 5436750 (1995-07-01), Kawano
patent: 5440418 (1995-08-01), Ishimura et al.
patent: 5884041 (1999-03-01), Hurwitz
patent: 2002/0021671 (2002-02-01), Quinlan
patent: 0939511 (1999-09-01), None
patent: 2003-110585 (2003-04-01), None
IEEE Standard 802.3, “3. Media Access Control Frame Structure”, IEEE, 2002, Section One, pp. 38-43.
IEEE Standard 802.3, “36. Physical Coding Sublayer (PCS) and Physical Medium Attachment (PMA) Sublayer, Type 1000Base-X”, IEEE, 2002, Section Three, pp. 32-77.
IEEE Standard 802.3, “37. Auto Negotiation Function, type 1000BaseX”, IEEE, 2002, Section Three, pp. 78-101.

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