Fujitsu Corporation

Hisashi Koga

Sumie Morita

Takashi Hatano

Akira Jinzaki

Toshiaki Ohishi

Tsutomu Shiomitsu

Takashi Sugino

Eiji Ishioka

Shigeru Sekine

Ryouzi Takano

Hiromi Odaka

Masako Shinmura

A transmitting side relay device comprises additional information generation means for generating additional information about the characteristics of a data stream, packet generation means for generating a packet by attaching additional information to each transfer unit and transmitting means for transmitting the packet to the third network according to prescribed procedures. A receiving side relay device comprises separation means for breaking down the received packet into additional information and a transfer unit, analysis means for analyzing the additional information, reproduction means for locating information included in a corresponding transfer unit in an appropriate position and reproducing the data stream and output means for outputting the data stream reproduced by the reproduction means to the second network.

Data communications system

A message division communication method and system are disclosed for a communication system comprising a host, an intermediate device connected to the host through a high-speed bus and a remote device connected to the intermediate device or the host through a low-speed bus. A message is transmitted in such a manner that the host designates and notifies the remote device of a maximum message length determined in a way corresponding to the transmission rate of the low-speed bus and divides the message into division messages each not exceeding the maximum message length thereby to transmit and receive the division messages between the host and the remote device. Even with a communication system in which low-speed and high-speed buses coexist, a message can be transmitted and received by a common communication control scheme.

Message division communication method and communication system

In a subscriber line control device connected to a plurality of subscriber circuits, there is a memory circuit for recording signal data indicating the states of subscriber lines, and hardware for displaying flags denoting changes in the signal data indicating the states of the subscriber lines, as well as firmware for monitoring periodically the flags displayed by the hardware.

Subscriber line control device

A time division allocating portion distributes a plurality of data links at a plurality of time division timings into which a predetermined period is divided. A remaining communication data supplying process executing portion executes a supplying process of remaining communication data for a data link allocated by the time division allocating portion at the time division timing only when the remaining communication data supplying process commanding portion commands the execution of the supplying process of the remaining communication data for the data link.

Traffic control apparatus

A time division allocating unit distributes a plurality of data links at a plurality of time division timings into which a predetermined period is divided. A communicable remaining data supplying process executing unit executes a supplying process of the remaining data for a data link, which allocated by the time division allocating unit at each time division timing, only when a communicable data supplying process commanding unit commands an execution of the supplying process of the communicable remaining data for the allocated data link.

A maintenance link is established according to a LAPD between first and second terminal units on a path through which subscribers' packet information is transmitted. In the first and second terminal units, first and second communication state control units are provided for controlling the consistency of the communication state between the two terminal units by sending/receiving communication state control information using the maintenance link.

Maintenance communication control system in an ISDN service

An ISDN D channel congestion control method has at least either a digital subscriber line circuit common (DLCC) or a signaling controller (SGC) notify either an SGC or a packet subscriber system (PSS) of a D channel congestion according to a predetermined protocol, thereby controlling the congestion of a communication controlling apparatus.

Growing community of inventors

Kawasaki, Japan

Hisashi Koga