Document Type and Number:
Japanese Patent JPS55934
Kind Code:
B2
Abstract:
A power feed arrangement provided as a safety measure in a communications system of the type in which two terminal stations are connected by at least one transmission path which transmits information signals from one of the stations to the other through information signal repeating means. Two sources (one at each station) supply energizing current along the transmission path to the repeating means, and, in addition, a monitoring signal is generated at each station to be transmitted along the transmission path to the other station and detected at that other station. If one of the monitoring signals is not detected, the energizing current supply sources are disconnected from the transmission path. Provision is made to ensure that the supply sources can only be connected to the transmission path following successful transmission and detection of the monitoring signals, and for testing the current output of the sources and the impedance of the transmission path prior to operation of the system.
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Inventors:
BOLTON L J
HALL B
HALL B
Application Number:
JP12532172A
Publication Date:
January 10, 1980
Filing Date:
December 15, 1972
Export Citation:
Assignee:
POST OFFICE (GB)
International Classes:
C22C11/02; H01M4/68; H02H1/00; H02H11/00; H04B3/44; H04B3/46