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NEC Corp
Original Assignee
NEC Corp
Nippon Electric Co Ltd
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Filing date
Publication date
Application filed by NEC Corp, Nippon Electric Co LtdfiledCriticalNEC Corp
Priority to JP436777ApriorityCriticalpatent/JPS5390706A/en
Publication of JPS5390706ApublicationCriticalpatent/JPS5390706A/en
H04M3/22—Arrangements for supervision, monitoring or testing
Landscapes
Engineering & Computer Science
(AREA)
Signal Processing
(AREA)
Monitoring And Testing Of Exchanges
(AREA)
Exchange Systems With Centralized Control
(AREA)
Abstract
PURPOSE:To enable the economization of the system by connecting the minumum necessary subscriber circuit tothe higher rank station with use of a wire spring replay and eliminating the use of the auxiliary battery in the switchboard circuit.
Circuit arrangement for telecommunications switching systems, in particular telephone switching systems, with switching networks and with central and partially central devices