Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NEC Corp
Original Assignee
NEC Corp
Nippon Electric Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by NEC Corp, Nippon Electric Co LtdfiledCriticalNEC Corp
Priority to JP50134553ApriorityCriticalpatent/JPS5258308A/en
Publication of JPS5258308ApublicationCriticalpatent/JPS5258308A/en
PURPOSE: To enable a sure switching operation with a simple function in carrier multi-communication line, by transmitting the switching information by utilizing the channel for call signal etc. outside the audio frequency transmission band.
COPYRIGHT: (C)1977,JPO&Japio
JP50134553A1975-11-071975-11-07Switching system for communication line
PendingJPS5258308A
(en)