JPS6473850A - Telephone set - Google Patents
Telephone setInfo
- Publication number
- JPS6473850A JPS6473850A JP62230464A JP23046487A JPS6473850A JP S6473850 A JPS6473850 A JP S6473850A JP 62230464 A JP62230464 A JP 62230464A JP 23046487 A JP23046487 A JP 23046487A JP S6473850 A JPS6473850 A JP S6473850A
- Authority
- JP
- Japan
- Prior art keywords
- telephone set
- line
- busy
- circuit
- call
- 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
Links
Abstract
PURPOSE:To prevent a telephone set in busy from being disturbed, by disconnecting a line between a line control means by a disconnection means at its own telephone set when a DC loop is already formed by another telephone set connected to the line. CONSTITUTION:At the front stage of a speech circuit 217, a disconnection circuit 231 consisting of a switch and a loop detection circuit 233 to detect the fact that another telephone set is in busy (off-hook state) are connected to the line 211. When the telephone set 2101 is set in a busy state and a test to place a call at another telephone set 2102 connected commonly to the line 211 is performed, since a speech switch is not closed by the operation of the loop detection circuit 233 even when a handset 223 is raised at the telephone set 2102, no call by the said telephone set 2102 can be performed.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62230464A JPS6473850A (en) | 1987-09-14 | 1987-09-14 | Telephone set |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62230464A JPS6473850A (en) | 1987-09-14 | 1987-09-14 | Telephone set |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6473850A true JPS6473850A (en) | 1989-03-20 |
Family
ID=16908252
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP62230464A Pending JPS6473850A (en) | 1987-09-14 | 1987-09-14 | Telephone set |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6473850A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0546025A (en) * | 1991-08-16 | 1993-02-26 | Ricoh Co Ltd | Electrophotographic recorder |
-
1987
- 1987-09-14 JP JP62230464A patent/JPS6473850A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0546025A (en) * | 1991-08-16 | 1993-02-26 | Ricoh Co Ltd | Electrophotographic recorder |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JPS6473850A (en) | Telephone set | |
GB1505926A (en) | Telephone line circuit | |
CA1062822A (en) | Direct station selection hold arrangement | |
JPS57107662A (en) | Outgoing and incoming call separating type telephone device | |
JPS6446364A (en) | Switching method for extension telephone set | |
JPS6436154A (en) | Telephone set permanent call preventing circuit | |
JPS56168464A (en) | Automatic dialing device | |
JPH01183945A (en) | Telephone set | |
JPS57113670A (en) | Telephone set | |
JPS5647156A (en) | Conference telephone release system | |
DE69219713T2 (en) | Control circuit for line switches of a telephone set | |
JPS56141648A (en) | Automatic answering telephone set | |
JPS6432748A (en) | Telephone system | |
JPS6461195A (en) | Extension telephone system | |
JPS5792963A (en) | Network control device | |
JPS6424554A (en) | Conference telephone device | |
KR970056534A (en) | How to automatically turn off the speakerphone call of the telephone device | |
JPS57210757A (en) | Telephone exchanger | |
JPS57210790A (en) | Telephone exchanger | |
JPS6454962A (en) | Speech circuit interruption device | |
JPS6457856A (en) | Automatic incoming circuit in telephone set | |
JPS5620397A (en) | Detecting circuit for state of subscriber's telephone set | |
JPS6442981A (en) | Facsimile equipment | |
JPS5787657A (en) | Loudspeaker telephone system | |
JPH01154663A (en) | Telephone terminal equipment for switching handset and speaker phone talking |