Finding duplex mismatches in copper based networks

Details Finding duplex mismatches in copper based networks Finding duplex mismatches in copper based networks

2004-06-10

2008-09-02

Ngo, Ricky (Department: 2616)

Multiplex communications

Duplex

Convertible to half duplex

C370S242000, C370S276000, C370S282000

Reexamination Certificate

active

07420938

ABSTRACT:
In an embodiment, a method for finding duplex mismatches in a copper based network, includes: detecting late collisions and cyclic redundancy check (CRC) errors; if a port is in auto-negotiation and up in half-duplex and over threshold late collisions have been detected, then informing the user of a duplex mismatch and suggesting to the user to set the port to full duplex; and if the port is in forced full-duplex mode and over threshold CRC errors have been detected, then informing the user of a duplex mismatch and suggesting to the user to set the port to auto-negotiations mode.

REFERENCES:
patent: 5610903 (1997-03-01), Crayford
patent: 6580697 (2003-06-01), Gardner et al.
patent: 6665275 (2003-12-01), Davy et al.
patent: 6938086 (2005-08-01), Banga
patent: 2006/0221843 (2006-10-01), Cidon et al.
Bunch, Bill; “An Introduction to Auto-Negotiation”; 1995; SCYLD Software; pp. 1-12.
“Port Configuration”, [webpages] [online], retrieved on Jan. 15, 2004. Retrieved from the internet: http://www.cisco.com/univercd/cc/td/doc/product/lan/c2900xl/29—35xp/olhelp/porthelp.htm. Total pp. 5.

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