Title:
TRANSMISSION LINE INTERFACE SWITCHING DEVICE
Document Type and Number:
Japanese Patent JP2561018
Kind Code:
B2
Abstract:
PURPOSE: To constitute the transmission line interface switching device so that a transmission line signal is not interrupted at the time of switching control.
CONSTITUTION: Relay switches 1 and 2 are provided to control the connection states between a pair of signal lines 100, through which balanced transmission line signals are transmitted, and a transformer 9 which is provided correspondingly to the pair of signal lines 100 and has the primary middle point grounded. Relay switches 3 and 4 are provided to control the connection states between a pair of signal lines 200 and a transformer 10 which is provided correspondingly to the pair to signal lines 200 and has the primary middle point grounded. The relay switch 3 is controlled to the turning-on state before the relay switch 1 is turned off, and the relay switch 4 is controlled to the turning-on state before the relay switch 2 is turned off. A selector part 11 is switched on the way of this control to prevent the interruption of the transmission line signal.
Inventors:
NINOMYA HIROSHI
FUKUZAWA SHIGEKAZU
FUKUZAWA SHIGEKAZU
Application Number:
JP32969093A
Publication Date:
December 04, 1996
Filing Date:
December 01, 1993
Export Citation:
Assignee:
NIPPON ELECTRIC CO
International Classes:
H04L1/22; H04L69/40; (IPC1-7): H04L29/14; H04L1/22
Domestic Patent References:
| JP6474843A |
Attorney, Agent or Firm:
Yanagi Kawa Shin