Abstract: Pieces of node equipment are each caused to store a management table which shows whether any resource in the system is inhibited from being switched by APS or permitted to be switched by APS. Each of the pieces of node equipment comprises not only an APS control section for realizing the APS function but also a switching inhibit control section for partially inhibiting the switching process by the APS control section on the basis of the management table, and a set request accepting section for accepting a set request message including the management table sent from network management equipment, interpreting the management table included in the message, and creating a management table to be stored in a memory unit.

Abstract: A Protection Primary state is newly defined. When the traffic route is switched by a ring interworking function, while APS is in operation, a protection primary node is caused to restore the service path.

Abstract: A telephone exchange is connected to a communication terminal installed in a predetermined region through a network. The telephone exchange includes: a reference time acquisition unit that acquires a reference time; a storage unit that stores time difference information concerning a time difference between a local standard time of the standard time in the predetermined region and the reference time acquired by the reference time acquisition unit; a local time calculation unit that calculates a local time of the time in the predetermined region based on the reference time obtained by the reference time acquisition unit and the time difference information stored in the storage unit; and a communication unit that transmits the local time calculated by the local time calculation unit to the communication terminal.

Abstract: A telephone exchange connects a plurality of telephone terminals through a communication network that transmits voice packet, and allows the plurality of telephone terminals to communicate with each other. The telephone exchange includes: a storage unit, a controller, and a transfer unit. The storage unit stores a group table representing a correspondence between a plurality of extension groups into which the telephone terminals are classified and the telephone terminals belonging to the extension groups. The controller, when a connection request to one of the extension groups occurs, refers to the group table and performs connection control for the telephone terminals in the corresponding extension group. The transfer unit transfers voice packets sent from the requester to all of the telephone terminals that belongs to the corresponding extension group through the communication network.

Abstract: A Protection Primary state is newly defined. When the traffic route is switched by a ring interworking function, while APS is in operation, a protection primary node is caused to restore the service path.

Abstract: Pieces of node equipment are each caused to store a management table which shows whether any resource in the system is inhibited from being switched by APS or permitted to be switched by APS. Each of the pieces of node equipment comprises not only an APS control section for realizing the APS function but also a switching inhibit control section for partially inhibiting the switching process by the APS control section on the basis of the management table, and a set request accepting section for accepting a set request message including the management table sent from network management equipment, interpreting the management table included in the message, and creating a management table to be stored in a memory unit.