Title:
【発明の名称】同報通信異常時の伝送路切り換え方式
Document Type and Number:
Japanese Patent JP2814313
Kind Code:
B2
Abstract:
PURPOSE:To expand a system without being aware of a specific management node by implementing abnormality detection and switching of a transmission line entirely according to the multiple address communication system. CONSTITUTION:Nodes 1, 2 make an alive report to all nodes respectively through a 1st transmission line 3 for a prescribed period in the transmission line switching system at the time of abnormal multiple address communication, each node receives the existence report from all nodes and when each node does not receive the existence report from any node within a prescribed time interval, each node sends a dead recognition message of the node via a 2nd transmission line to all nodes and the node receiving the dead recognition message of its own station sends the existence report and the switching instruction of a transmission line through which a user message is sent to all the nodes through the transmission line 4 and each node makes the switching of the transmission line. Thus, the fault at the time of the fault of a management node is easily detected.
Inventors:
Yoshinori Sato
Keijiro Hayashi
Katsuo Suzuki
Shugo Toshima
Tsutomu Onuki
Akihiro Takahashi
Keijiro Hayashi
Katsuo Suzuki
Shugo Toshima
Tsutomu Onuki
Akihiro Takahashi
Application Number:
JP8687391A
Publication Date:
October 22, 1998
Filing Date:
April 18, 1991
Export Citation:
Assignee:
株式会社日立製作所
日立プロセスコンピュータエンジニアリング株式会社
日立プロセスコンピュータエンジニアリング株式会社
International Classes:
G06F13/00; H04L1/22; H04L12/18; H04L12/28; H04L12/40; H04L45/24; (IPC1-7): H04L12/18; G06F13/00; H04L1/22; H04L12/28
Domestic Patent References:
| JP1258522A | ||||
| JP4207338A |
Attorney, Agent or Firm:
Unuma Tatsuyuki