Multiplex communications – Diagnostic testing – Fault detection
Reexamination Certificate
2008-12-10
2011-11-15
Lee, Andrew (Department: 2472)
Multiplex communications
Diagnostic testing
Fault detection
C370S248000, C370S394000
Reexamination Certificate
active
08059550
ABSTRACT:
To provide an electronic apparatus capable of easily detecting a terminal that forms a loop connection state with a simplified configuration.A control unit counts the number of broadcast packet supplied from a switching hub to a communication unit within a predetermined time period and determines whether the number of packets exceeds a threshold value (ST2, ST3). If the number of packets exceeds the threshold value, the control unit determines that an abnormal connection state occurs, that is, a loop is detected and starts a process in which the control unit identifies a network terminal that forms the loop connection state (ST3, ST5). The control unit counts the number of broadcast packets that reach each of the network terminals, that is, broadcast packets input to each port of the switching hub. Thereafter, the control unit determines whether the network terminal that has received the number of packets exceeding the threshold value is present, that is, whether an abnormally connected terminal is present (ST5, ST6). If an abnormally connected terminal is present, the control unit displays a message indicating abnormal connection, the abnormally connected terminal, and a message prompting connection change (ST7).
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Kitano Masaki
Saito Takehiko
Shigei Hiroyuki
Takesue Masaaki
Lee Andrew
Lerner David Littenberg Krumholz & Mentlik LLP
Sony Corporation
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