JPS5498105A - Howler tone transmission system - Google Patents

Howler tone transmission system

Info

Publication number
JPS5498105A
JPS5498105A JP496678A JP496678A JPS5498105A JP S5498105 A JPS5498105 A JP S5498105A JP 496678 A JP496678 A JP 496678A JP 496678 A JP496678 A JP 496678A JP S5498105 A JPS5498105 A JP S5498105A
Authority
JP
Japan
Prior art keywords
howler tone
switch
circuit
contact
howler
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
JP496678A
Other languages
Japanese (ja)
Inventor
Nobuaki Saito
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 Ltd filed Critical NEC Corp
Priority to JP496678A priority Critical patent/JPS5498105A/en
Publication of JPS5498105A publication Critical patent/JPS5498105A/en
Pending legal-status Critical Current

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  • Devices For Supply Of Signal Current (AREA)

Abstract

PURPOSE: To perform howler tone transmission in the exchange including a channel switch where high-level signals cannot pass, by utilizing the transmission circuit of call signals, which operate the bell of a telephone set, to perform howler tone transmission.
CONSTITUTION: In case that call signals and howler tone are transmitted to 1a and 1b respectively, contact circuit 2a is switched by the control from control circuit 9 of an exchange, and call signals are transmitted to the subscriber's telephone set of input terminal 1a from call signal generator 8. Switch 6a corresponding to contact circuit 2a repeats to turn on and off; and when switch 6a is turned off, switch 6b is turned on by the control from control circuit 9, and further, switching contact 11 is switched to the howler tone generator 13 side by the operation of switch 12, and howler tone is transmitted from common signal line 10 to the subscriber's telephone set of input terminal 1b through contact 2b. As a result, howler tone transmission can be performed even if channel switches where high-level signals cannot pass are included.
COPYRIGHT: (C)1979,JPO&Japio
JP496678A 1978-01-20 1978-01-20 Howler tone transmission system Pending JPS5498105A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP496678A JPS5498105A (en) 1978-01-20 1978-01-20 Howler tone transmission system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP496678A JPS5498105A (en) 1978-01-20 1978-01-20 Howler tone transmission system

Publications (1)

Publication Number Publication Date
JPS5498105A true JPS5498105A (en) 1979-08-02

Family

ID=11598320

Family Applications (1)

Application Number Title Priority Date Filing Date
JP496678A Pending JPS5498105A (en) 1978-01-20 1978-01-20 Howler tone transmission system

Country Status (1)

Country Link
JP (1) JPS5498105A (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS523318A (en) * 1975-06-24 1977-01-11 Nec Corp Howler circuit

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS523318A (en) * 1975-06-24 1977-01-11 Nec Corp Howler circuit

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