JPS5531365A - Roundabout check circuit - Google Patents

Roundabout check circuit

Info

Publication number
JPS5531365A
JPS5531365A JP10513478A JP10513478A JPS5531365A JP S5531365 A JPS5531365 A JP S5531365A JP 10513478 A JP10513478 A JP 10513478A JP 10513478 A JP10513478 A JP 10513478A JP S5531365 A JPS5531365 A JP S5531365A
Authority
JP
Japan
Prior art keywords
roundabout
securing
switch
key station
check
Prior art date
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.)
Pending
Application number
JP10513478A
Other languages
Japanese (ja)
Inventor
Shinichi Kuriaki
Mitsukazu Koyama
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.)
Fujitsu Ltd
Original Assignee
Fujitsu 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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP10513478A priority Critical patent/JPS5531365A/en
Publication of JPS5531365A publication Critical patent/JPS5531365A/en
Pending legal-status Critical Current

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  • Mobile Radio Communication Systems (AREA)

Abstract

PURPOSE: To check the roundabout action by mounting the switch which releases the voice circuit part to the extent that it is not interrupted to send and receive the control signal required for securing the circuit, in the multiple access radiotelephony equipment.
CONSTITUTION: Since the switch SW1 in the key station 21 is opened at the time of securing the radiolink, it is possible to check the roundabout action by which the signal of the substation 41 which is sent out from the signal modulator 53 is leaked to the isolation side of the hybrid 26 from the hybrid 48, the transmitter 43, and the key station receiver 29, is overlapped with a dial tone from the switchboard side, and a flat dial tone is heard to the receiver of the telephone 60. Also, since the switch SW6 of the substation 41 is opened at the time of securing the radiolink, it is possible not only to prevent the control signal which is transmitted from the key station 21 in this case from being leaked to the telephone 60 but also not to mix noise into the busy tone transmitted to a subscriber side when the radiochannel is being used.
COPYRIGHT: (C)1980,JPO&Japio
JP10513478A 1978-08-29 1978-08-29 Roundabout check circuit Pending JPS5531365A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10513478A JPS5531365A (en) 1978-08-29 1978-08-29 Roundabout check circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10513478A JPS5531365A (en) 1978-08-29 1978-08-29 Roundabout check circuit

Publications (1)

Publication Number Publication Date
JPS5531365A true JPS5531365A (en) 1980-03-05

Family

ID=14399274

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10513478A Pending JPS5531365A (en) 1978-08-29 1978-08-29 Roundabout check circuit

Country Status (1)

Country Link
JP (1) JPS5531365A (en)

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