Title:
TRANSMISSION LINE SUPERVISORY DEVICE
Document Type and Number:
Japanese Patent JPH1198075
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide a transmission line supervisory device which copes with multiple failures in a transmission line that is made redundant configuration. SOLUTION: Selectors 26 and 28 are provided in a repeater 42 that is arranged on a transmission line which is made redundant configuration, and when a transmission line failure occurs in a current optical fiber cable 12a, one selector 26 is switched and a coaxial cable 18 that is a spare transmission line is selected. With this, only a section where the failure occurs is partially switched to the spare transmission line and the transmission of a normal signal between terminal stations is maintained. When all optical fiber cables 12a and 16a simultaneously have transmission line failures in the same relaying section and a normal signal can not be acquired from an upstream, the other selector 28 selects a substitute signal from a backup oscillator 30 in the repeater and saves an downstream relay section.
Inventors:
UEMATSU KIYOSHI
Application Number:
JP25845897A
Publication Date:
April 09, 1999
Filing Date:
September 24, 1997
Export Citation:
Assignee:
OKI ELECTRIC IND CO LTD
International Classes:
H04B10/03; H04B10/032; H04B10/07; H04B10/077; H04B10/079; H04B10/278; H04B10/29; H04B17/40; H04L69/40; (IPC1-7): H04B10/02; H04B10/08; H04B17/02; H04L29/14
Attorney, Agent or Firm:
Takao Katori
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