Patent ID: 7724690

Claim:
A method for controlling to transfer and set control data in a plurality of transmission apparatuses installed in a ring network over a predetermined protocol, wherein each of the plurality of transmission apparatuses has a parent apparatus registration section and a child apparatus management table, the method in each of the plurality of transmission apparatuses comprising: retaining information of whether any transmission apparatus is registered as a parent apparatus for a concerned transmission apparatus in the parent apparatus registration section of the concerned transmission apparatus; retaining information of whether the concerned transmission apparatus is registered as a parent apparatus for any transmission apparatus in the child management table of the concerned transmission apparatus; and requesting by a processor of the concerned transmission apparatus to a parent apparatus designated by the maintenance operator to transfer the control data stored in the storing unit of the patent apparatus, to the concerned transmission apparatus, when no transmission apparatus is registered in the parent apparatus registration section of the concerned transmission apparatus, and the designated parent apparatus is not included in the child apparatus management table of the concerned transmission apparatus, wherein: in a transmission apparatus designated as the parent apparatus when modifying control data set in the parent apparatus, if the control data is an object for inheritance, the parent apparatus transmits a portion of the control data having been modified to all transmission apparatuses registered as a child apparatus in the child apparatus management table, and on receipt of the control data portion having been modified, each of the transmission apparatuses registered as child apparatus overwrites the received control data portion on the corresponding portion.