JPS5549061A - Call stop release unit - Google Patents
Call stop release unitInfo
- Publication number
- JPS5549061A JPS5549061A JP12316978A JP12316978A JPS5549061A JP S5549061 A JPS5549061 A JP S5549061A JP 12316978 A JP12316978 A JP 12316978A JP 12316978 A JP12316978 A JP 12316978A JP S5549061 A JPS5549061 A JP S5549061A
- Authority
- JP
- Japan
- Prior art keywords
- call
- stop
- release unit
- exchange side
- key
- 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.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M3/00—Automatic or semi-automatic exchanges
- H04M3/08—Indicating faults in circuits or apparatus
- H04M3/12—Marking faulty circuits "busy"; Enabling equipment to disengage itself from faulty circuits ; Using redundant circuits; Response of a circuit, apparatus or system to an error
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
Abstract
PURPOSE:To stop and release a call repeatedly from an exchange side by switching a latch relay by a switching element controlled in accordance with a difference in potential when an originating stop operation key is operated at the exchange side. CONSTITUTION:Call stop release unit 1 is connected between channels A and B of arrester elastic spring 2 and either channel is provided with relay contact (r) which connect or disconnect subscriber's telephone set 3 to or from channels A and B when an originating stop operation key in exchange 4 is operated. Then, the contact (r) is switched by driving latch relay R by switching elements T1 and T2 controlled in accordance with difference in potential at the time of the operation of the key. As a result, call stopping operation and call releasing operation can be set freely through remote control from the exchange side.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP12316978A JPS606592B2 (en) | 1978-10-05 | 1978-10-05 | Call stop release device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP12316978A JPS606592B2 (en) | 1978-10-05 | 1978-10-05 | Call stop release device |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5549061A true JPS5549061A (en) | 1980-04-08 |
JPS606592B2 JPS606592B2 (en) | 1985-02-19 |
Family
ID=14853883
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP12316978A Expired JPS606592B2 (en) | 1978-10-05 | 1978-10-05 | Call stop release device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS606592B2 (en) |
-
1978
- 1978-10-05 JP JP12316978A patent/JPS606592B2/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
JPS606592B2 (en) | 1985-02-19 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
GB2023969A (en) | Communication system conferencing arrangement | |
GB1013594A (en) | Improvements in communication switching systems | |
JPS5434709A (en) | Call interruption system in facsimile communication | |
JPS5549061A (en) | Call stop release unit | |
JPS5686563A (en) | Button telephone set | |
GB1187487A (en) | Combination Conference Connection and Call Transfer Device for Telephone Subscriber Lines | |
JPS5725768A (en) | Power off circuit of telephone exchange | |
JPS57131191A (en) | Telephone device | |
JPS5662442A (en) | Composite exchange system | |
JPS57178453A (en) | Switch mechanism | |
JPS5673997A (en) | Extension transmission restricting system | |
JPS537105A (en) | Transmission relay exchange system for aural and facsimile signals | |
JPS55688A (en) | Power interruption supervisory circuit for key telephone unit | |
JPS5621494A (en) | Dial pulse control system | |
JPS55159664A (en) | Network control circuit | |
JPS56166695A (en) | Incoming call answering system | |
JPS6455954A (en) | System for detecting off-hook | |
JPS5792963A (en) | Network control device | |
JPS5563162A (en) | Subscriber line call signal transmission system | |
JPS6453676A (en) | Terminal calling control device | |
JPS55140353A (en) | Telephone trunk line traffic control system | |
JPS52100803A (en) | Call wating system | |
JPS6422193A (en) | Telephone system | |
JPS5590170A (en) | Control system for incoming transfer unit | |
JPS57210791A (en) | Telephone exchanger |