Title:
【発明の名称】回線切替装置
Document Type and Number:
Japanese Patent JP2586573
Kind Code:
B2
Abstract:
PURPOSE:To always set a communication channel automatically for a normal system even when trouble occurs in the system of one side by providing the node corresponding parts of subnetworks of two systems and a monitor and control part and a switching control part. CONSTITUTION:The node corresponding parts 4a, 5a of the respective subnetworks of 0-system and 1-system send reception data from a node device to a D channel processing part 2a, and the data is analyzed by the D channel processing part 2a. In the case that the trouble occurs in the system of one side, when system switching information is informed from the D channel processing part 2a to the monitor and control part 1a, a switching instruction is issued from the monitor and control part 1a, and in the switching control part 3a, by selecting a B channel so as to connect each B channel of a terminal corresponding part 6a to one of two systems of the node devices, the communication channel is automatically connected from the system in which abnormality occurred to the normal system. Thus, a communication terminal can be made to be one set, and in the case of the occurrence of the trouble of the subnetwork during communication, the subnetwork can be switched automatically to the subnetwork of the other side.
Inventors:
SHOJI HIDEJI
Application Number:
JP11393288A
Publication Date:
March 05, 1997
Filing Date:
May 11, 1988
Export Citation:
Assignee:
MATSUSHITA ELECTRIC IND CO LTD
International Classes:
H04L1/22; H04L12/02; (IPC1-7): H04L12/02; H04L1/22
Domestic Patent References:
| JP59107665A | ||||
| JP59108152A | ||||
| JP60119146A | ||||
| JP62159524A |
Attorney, Agent or Firm:
Tomoyuki Takimoto (1 person outside)