Abstract: A unicast/multicast system has an internal cell generating section that generates an internal cell to include its output index information based on user data, and an output port conversion table that stores the relation of output index information and output port number for the internal cell in the form of one-to-one for the unicast and one-to-multiple for the multicast.

Abstract: A unicast/multicast system has an internal cell generating section that generates an internal cell to include its output index information based on user data, and an output port conversion table that stores the relation of output index information and output port number for the internal cell in the form of one-to-one for the unicast and one-to-multiple for the multicast.

Abstract: A unicast/multicast system has an internal cell generating section that generates an internal cell to include its output index information based on user data, and an output port conversion table that stores the relation of output index information and output port number for the internal cell in the form of one-to-one for the unicast and one-to-multiple for the multicast.

Abstract: A unicast/multicast system has an internal cell generating section that generates an internal cell to include its output index information based on user data, and an output port conversion table that stores the relation of output index information and output port number for the internal cell in the form of one-to-one for the unicast and one-to-multiple for the multicast.

Abstract: A unicast/multicast system has an internal cell generating section that generates an internal cell to include its output index information based on user data, and an output port conversion table that stores the relation of output index information and output port number for the internal cell in the form of one-to-one for the unicast and one-to-multiple for the multicast.

Abstract: A digital switching system capable of changing switching capacity without any recourse of increasing or decreasing the quantities of line terminals or cross-point switches. The digital switching system comprises line terminals which send and receive data as serial data to and from the user, a switching arrangement which switches, based on destination information, the parallel data converted from the serial data, and data converters capable of converting between the serial data and the parallel data at a specified conversion ratio. The serial/parallel converter circuit of a serial/parallel converter in a digital switching system comprises a 1:4 transceiver, four variable converters, and 16 selector circuits The 1:4 transceiver converts serial data into 4-bit wide parallel data and sends the parallel data to the variable converters. If mode selection information specifies a conversion ratio of 1:4, only a tristate buffer is enabled and 4-bit wide parallel data is output.

Abstract: A packet accounting machine has a packet detector that detects a packet read source and destination addresses, a port number and the number of bytes included in the packet and transfers them to a flow processing unit. A flow processing unit acquires a flow identifier, sending and receiving accounting coefficients and sends them together with the number of bytes in the packet to a flow counter control unit. The flow counter control unit adds the number of bytes to the number of bytes included in packets stored in a flow counter and instructs the flow counter to store the sending and receiving accounting coefficients. An accounting calculator reads the number of bytes in the packets, the sending and receiving accounting coefficients from the flow counter, calculates accounting on the sending and receiving sides and records them in the accounting recorder.