Abstract: A signal distribution method and a signal distribution apparatus are disclosed, wherein transport packets of a television signal containing multiplexed channels are provided in a transmission format of a digital broadcasting standard, and such transport packets are transmitted and distributed over a synchronous network. Transmission rate (data speed) of the transport packets of a given customer in the synchronous network is selectable based on the number of multiplexed channels for the customer.

Abstract: A switch station including an ATM switch; a memory storing control data for operations of the switch station; an intra-station device, accommodating a subscriber line, performing communication operation on subscriber ATM cell; a control processor generating control information in link access protocol (LAP) format; and an interface unit converting LAP control information into ATM cell to the intra-station device through the ATM switch, wherein the control information is communicated according to LAP, the intra-station device receives the control information and transmits a direct memory access request to obtain control data stored in the memory, the interface unit obtains and converts the data format of the control data into ATM cell to transmit to the intra-station device through the switch, and the intra-station device performs the communication operation on the subscriber ATM cell based on the control data received through the switch.

Abstract: An Ethernet frame nester nests Ethernet frames addressed to a plurality of remote station devices affiliated with a shared station device on the basis of the correspondence relation between a MAC address of the station device and MAC addresses of the remote station devices stored in a table and the transmission destination addresses of the Ethernet frames. The Ethernet frame nester then converts them into an RPR frame. When receiving an RPR frame addressed to the own station device, an Ethernet frame extractor extracts Ethernet frames from the RPR frame and transmits each Ethernet frame to the addressed remote station devices.

Abstract: Provided is an RPR ring network system including: a plurality of RPR station devices; and a ring for interconnecting the plurality of RPR station devices, in which a section between adjacent RPR station devices is defined as a section of the ring, a bandwidth different from bandwidths of other sections are allocated to at least one section, and each of the RPR station devices transmits a frame, in the case of transmitting the frame to the other RPR station device through the ring, by a transmission bandwidth with a minimum value of a bandwidth allocated to a section through which the frame flows set as an upper limit.

Abstract: A data communication system is capable of performing data communication by readily changing the ratio of SCN/SD data and DMA data corresponding to each communication and to individual destination devices. The data communication system may include a first communication device and at least one second communication device, connected to said first communication device via a transmission path, said first communication device notifying a transmission frame format to said second communication device, and said first communication device and said second communication device transmitting and receiving data using said notified transmission frame format.

Abstract: A signal distribution method and a signal distribution apparatus are disclosed, wherein transport packets of a television signal containing multiplexed channels are provided in a transmission format of a digital broadcasting standard, and such transport packets are transmitted and distributed over a synchronous network. Transmission rate (data speed) of the transport packets of a given customer in the synchronous network is selectable based on the number of multiplexed channels for the customer.

Abstract: The quality and performance of the connectionless communications system are improved. When a BOM is received, the destination address DA of the L3-PDU stored in the payload of the BOM is retrieved, and the tag information is obtained from the DA (S11). The output message identifier MID is reserved (S12), and the tag information and output MID are assigned to the BOM (S13). Then, the tag information and output MID are written to the table. When a COM is received, the tag information and output MID are retrieved using the MID of the COM as a key, and the information is provided for the COM (S31 and S32). When an EOM is received, the tag information and output MID are retrieved using the MID of the EOM as a key, and the information is provided for the EOM (S41 and S42). Then, the output MID is released (S43).

Abstract: The quality and performance of the connectionless communications system are improved. When a BOM is received, the destination address DA of the L3-PDU stored in the payload of the BOM is retrieved, and the tag information is obtained from the DA (S11). The output message identifier MID is reserved (S12), and the tag information and output MID are assigned to the BOM (S13). Then, the tag information and output MID are written to the table. When a COM is received, the tag information and output MID are retrieved using the MID of the COM as a key, and the information is provided for the COM (S31 and S32). When an EOM is received, the tag information and output MID are retrieved using the MID of the EOM as a key, and the information is provided for the EOM (S41 and S42). Then, the output MID is released (S43).

Abstract: An ATM exchange network system in which a first equipment and a second equipment are connected through a duplex communication line comprising a working line and a protection line. In this system, each of the first equipment and second equipment provides: a bridging unit which bridges the working line and the protection line on the transmission side; a switch for selecting the working line or the protection line on the reception side; a K-byte generating function for generating byte information containing information for realizing the APS; a function of receiving the K byte information from the protection line, analyzing the received information, placing the prescribed information in the K byte and realizing the APS; and a function of changing over the switch. Thus, the reliability with respect to a line failure in the ATM exchange network can be improved.