Abstract: A transmitting apparatus provided in a network different from IP comprises IP telephone control means for implementing an IP telephone function by dealing with IP data including audio information; means for capsuling the IP data dealt with by the IP telephone control means into data suitable for the protocol of the network in which the local apparatus is provided; means for transmitting to the network the data capsuled by the capsuling means; means for receiving, via the network, data capsuled by capsuling means of another transmitting apparatus; and means for extracting IP data from the data received by the receiving means.

Abstract: The present invention relates to a firmware maintenance system, which reduces the size of the hardware and increases reliability. The firmware maintenance system maintains a station to be maintained having firmware, from a remote location. The system has a microcomputer in the station to be maintained; a non-volatile memory which includes an area for storing the firmware and managing the storing location; and a memory management unit for converting the logical address of the microcomputer and the physical (real) address of the non-volatile memory. The memory management unit transfers the firmware required to be updated as an undivided whole to the station to be maintained from the remote location, and updates and stores the transferred firmware in the non-volatile memory.

Abstract: A centralized supervisory supervises a plurality of network equipments connected to each other by lines based on performance data indicating operation states of the plurality of network equipments. The system includes a central supervisory device, and a medium supervisory system provided between the central supervisory device and the plurality of network equipments. The central supervisory device includes a command output unit for outputting a control command regarding gathering of the performance data, and a status table having state data indicating states of the respective network equipments.

Abstract: A centralized supervisory control system allowing a centralized supervisory control center exactly to grasp information about failures and other events occurring in a plurality of supervised apparatuses, the center being also notified of time-of-day indications corresponding to such occurrences. Each of the supervised apparatus turns its information into blocks for output to an intermediate control apparatus. The intermediate control apparatus continuously collects such status data from the supervised apparatuses and compares the data with the status data currently held in its memory. If the latest status data from a given supervised apparatus are found to contain a deviation from the old data, the latest data are stored in memory along with a time-of-day indication corresponding to the deviation. The latest status data and the time-of-day indication are sent to the centralized supervisory control center.

Abstract: A data communication system which can eliminate the need for repeating equipment therein system, and allowing coexistence of an analog line and a digital line. The system also prevents generating any delays in the transfer of information. The system utilizes slave stations provided between the analog line and digital line of the data communication system, which have a modem circuit connected to the analog line for demodulating the signal sent from the master station and modulating the signal to the lower level slave station and the signal to the master station from that particular station.