Fujitsu Corporation

Megumi Shibata

Satoshi Kakuma

Sumie Morita

Yuzo Okuyama

Hiroyuki Iwaki

Masaki Hiromori

Yuji Kamura

Masato Hashizume

Toshiaki Asai

Hiroyoshi Yoda

Kenji Kazehaya

Yoshinari Oshio

Seiji Matsuzaki

Hisanori Okano

Hitoshi Ouchi

Yasunori Tonooka

A method of determining a transmission route for optical signals in an optical signal transmission system comprising a transmitter for optical signals, a receiver for the optical signals, and repeaters for repeating the optical signals transmitted from the transmitter to the receiver, and having transmission routes between the transmitter and the receiver, wherein the numbers of the wavelength components of the optical signals that has been in-use in each section defined to each of the transmission routes, the acquired numbers of wavelength components are compared among the transmission routes, and one of the transmission routes having the minimum number of wavelength components is determined as the transmission route used to set the line.

Route determination method used in optical signal transmission system

A transmission device and an integrated circuit improved in quality and reliability of digital transmission control. A memory stores an input signal, write address generating means generates a write address for writing in the memory, and read address generating means generates a read address for reading from the memory. Phase state monitoring means monitors a transition from a steady phase state in which writing/reading in/from the memory is normally performed or from a startup state to a coincident phase state in which address values of the write and read addresses coincide with each other or to an unstable phase state in which a phase fluctuation margin is one-sided. When the coincident phase state or the unstable phase state is detected, reset signal output means outputs a reset signal to the write and read address generating means such that the phase relation between the write and read addresses is brought to an optimum phase relation.

Transmission device and integrated circuit

A communication signal suppressing apparatus capable of reducing a load of a firmware using portion is provided in a communication signal apparatus such as a common line signal apparatus. A common line signal processing circuit corresponds to hardware used to execute a portion of the level-2 process operation, and this common line signal processing circuit owns such a function capable of discarding a reception frame having no meaning other than a confirmation response, and also capable of extracting a reverse-direction sequence number thereof. As a result, the common line signal processing circuit performs a remaining level-2 process operation. Thus, since a workload of a processing apparatus (CPU) using the firmware can be reduced, this firmware can be designed with sufficient capacities. Also, other process operations can be carried out by this CPU.

Communication signal suppressing apparatus and common line signal apparatus capable of reducing workload of firmware

A message information terminating system in a switching center is connected to a plurality of remote stations by Derived Data Link interfaces and includes transmission lines connected to the same data terminal unit of the switching center, for transmitting message information containing various information such as subscriber information with communication data by framing bits between the switching center and each of said remote stations, and a message terminating equipment provided with a processing unit for analyzing the message information and disposed in a network at the switching center. The data terminal unit collects the message information from a plurality of the remote stations and transmits the message information to the message terminating equipment through the network. The message terminating equipment separates the message information from each of the remote stations, analyzes the message information, using the processing unit, and sends normal message information to a control processor in the switching center when the message terminating equipment detects a normal message.

Message information terminating system

Growing community of inventors

Kameoka, Japan

Megumi Shibata