Control system for configuring ring LAN with improved reconfiguration operation

In a ring LAN system having a configuration control unit serially connected to a dual ring transmission line, said configuration control unit comprises:

• transmission line reconfiguration means for disconnecting a fault point upon detection of a fault occurring on the transmission line and, after recovery of said fault, reconnecting the disconnected point;
• reconfiguration suspension means for suspending operation of said transmission line reconfiguration means if operation of said transmission line reconfiguration means is performed more than a predetermined number of times within a predetermined time period;
• and
• start up suspension means for suspending operation of said reconfiguration suspension means during a preselected time period after starting up said configuration control unit.

A configuration control unit serially connected to a dual ring transmission line of a ring LAN system, said configuration control unit comprising:

• transmission line reconfiguration means for disconnecting a fault point upon detection of a fault occurring on the transmission line and, after recovery of said fault, reconnecting the disconnected point;
• reconfiguration function suspending means for suspending operation of said transmission line reconfiguration means if operation of said transmission line reconfiguration means is performed more than a predetermined number of times within a predetermined time period;
• and
• start up suspension means for suspending operation of said reconfiguration function suspending means during a preselected time period after starting up said configuration control unit.

A control system for controlling a configuration of a ring LAN system, said control system comprising:

• a dual ring transmission line;
• and
• a configuration control unit serially connected to said dual ring transmission line, said configuration control unit comprising:
• transmission line reconfiguration means for disconnecting a fault point upon detection of a transmission fault occurring on said transmission line and, after recovering said fault, reconnecting said disconnected point,
• reconfiguration suspension operation of means for suspending said transmission line reconfiguration means if operation of said transmission line reconfiguration means is performed more than a predetermined number of times within a predetermined time period, and
• start up suspension operation of means for suspending said reconfiguration suspension means during a preselected time period after starting up said configuration control unit.

A ring LAN system having a configuration control unit for system reconfiguration operation, said ring LAN system comprising:

• a dual ring transmission line;
• and
• a configuration control unit serially connected to said dual ring transmission line, said configuration control unit comprising:
• transmission line reconfiguration means for disconnecting a fault point upon detection of a transmission fault occurring on said transmission line and, after recovering said fault, reconnecting the disconnected point,
• reconfiguration suspension means for suspending operation of said transmission line reconfiguration means if operation of said transmission line reconfiguration means is performed more than a predetermined number of times within a predetermined time period, and
• start up suspension means for suspending operation of said reconfiguration suspension means during a preselected time period after starting up said configuration control unit.

A method for controlling a configuration control unit serially connected to a dual ring transmission line in a ring LAN system, said method comprising the steps of:

• detecting a point of transmission fault occurring along said transmission line;
• disconnecting said point from said transmission line;
• reconnecting said point to said transmission line after recovering said transmission fault;
• suspending said disconnecting and reconnecting steps if said disconnecting and reconnecting steps are performed more than a predetermined number of times within a predetermined time period;
• and
• suspending said suspending step during a preselected time period after starting up said configuration control unit.