Abstract: Apparatus, method and program for restoring path information to its original status when a trouble occurs on a network. An apparatus control part generates, based on a switch information list and an I/F information list stored in a nonvolatile storing part, link information that is prior to the reactivation and used for determining adjacent communication apparatuses. The apparatus control part acquires, via a control network from the adjacent communication apparatuses described in the generated link information, held path information. Thereafter, the apparatus control part (11) decides, based on a stored definition information list, a path sequence such that the path of a lower order layer is placed before the path of an upper order layer. Thereafter, the apparatus control part generates the path information based on the path sequence and further based on the previously acquired held path information.

Abstract: A time slot selection device is provided that can consider resource use states on its own and allocate time slots. The time slot selection device performs time slot allocation, based on data link identifiers that identify a group of data links specified by a path setup request, a time slot size that is information about a required band, and a required number that is the number of contiguous time slots required. In this time slot selection device, a resource allocation section performs time slot selection, based on the resource use state of each time slot. By the time slot selection with consideration given to the use state of each time slot in the group of data links, time slots to be used can be selected so that a maximum number of contiguous usable time slots will be left. Thus, it is possible to efficiently use resources.

Abstract: [PROBLEMS] To certainly restore path information to its original status when a trouble occurs on a network. [MEANS FOR SOLVING PROBLEMS] After reactivation, an apparatus control part (11) generates, based on a switch information list (123a) and an I/F information list (123b) stored in a nonvolatile storing part (123), link information that is prior to the reactivation and used for determining all adjacent communication apparatuses (10). The apparatus control part (11) acquires, via a control network (20) from all the adjacent communication apparatuses (10) described in the generated link information, held path information held by adjacent communication apparatuses (10) Thereafter, the apparatus control part (11) decides, based on a definition information list (113b) stored in nonvolatile storing part (113), a path sequence such that the path of a lower order layer is placed before the path of an upper order layer.

Abstract: A time slot selection device is provided that can consider resource use states on its own and allocate time slots. The time slot selection device performs time slot allocation, based on data link identifiers that identify a group of data links specified by a path setup request, a time slot size that is information about a required band, and a required number that is the number of contiguous time slots required. In this time slot selection device, a resource allocation section performs time slot selection, based on the resource use state of each time slot. By the time slot selection with consideration given to the use state of each time slot in the group of data links, time slots to be used can be selected so that a maximum number of contiguous usable time slots will be left. Thus, it is possible to efficiently use resources.