JPS5754493A - Extension connecting system in private branch of exchange - Google Patents
Extension connecting system in private branch of exchangeInfo
- Publication number
- JPS5754493A JPS5754493A JP13044280A JP13044280A JPS5754493A JP S5754493 A JPS5754493 A JP S5754493A JP 13044280 A JP13044280 A JP 13044280A JP 13044280 A JP13044280 A JP 13044280A JP S5754493 A JPS5754493 A JP S5754493A
- Authority
- JP
- Japan
- Prior art keywords
- telephone set
- impedance
- exchange
- private branch
- compensation
- 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
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q3/00—Selecting arrangements
- H04Q3/58—Arrangements providing connection between main exchange and sub-exchange or satellite
- H04Q3/62—Arrangements providing connection between main exchange and sub-exchange or satellite for connecting to private branch exchanges
- H04Q3/625—Arrangements in the private branch exchange
Landscapes
- Physics & Mathematics (AREA)
- Astronomy & Astrophysics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Sub-Exchange Stations And Push- Button Telephones (AREA)
Abstract
PURPOSE:To make the impedance in the extension side equal regardless of any connection path, by connecting an impedance compensation line to the connection path between the extensions and a main trunk. CONSTITUTION:A telephone set N and a main trunk CO are connected via a channel SW of a normal private branch of exchange and a main line trunk COT, and the smoothing circuit network Zn of this telephone set N is designed in matching to the impedance Zp at the extension side of the private branch of exchange. When the telephone set N is used at night as a direct call telephone set, a switching relay (not shown) is operated and the telephone set N is connected to the main trunk CO via the make-side between the CO and contacts nt<0>-nt<3> and impedance compensation circuit BN. The compensation of impedance viewing the CO from the telephone set N is made at the compensation circuit BN to reduce the side tone when the telephone N is used as direct telephone set.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13044280A JPS5754493A (en) | 1980-09-19 | 1980-09-19 | Extension connecting system in private branch of exchange |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13044280A JPS5754493A (en) | 1980-09-19 | 1980-09-19 | Extension connecting system in private branch of exchange |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5754493A true JPS5754493A (en) | 1982-03-31 |
Family
ID=15034336
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP13044280A Pending JPS5754493A (en) | 1980-09-19 | 1980-09-19 | Extension connecting system in private branch of exchange |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5754493A (en) |
-
1980
- 1980-09-19 JP JP13044280A patent/JPS5754493A/en active Pending
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JPS5639670A (en) | Circuit switching unit | |
JPS5754492A (en) | Incoming call detour system in private branch of exchange | |
JPS5652959A (en) | Network connection system | |
JPS5754493A (en) | Extension connecting system in private branch of exchange | |
JPS54114011A (en) | Loudspeaker telephone device | |
JPS5513569A (en) | Channel system in remote control time division electronic exchange system | |
JPS57135560A (en) | Communication circuit monitoring system | |
JPS6486649A (en) | Switching system for speech circuit and speaker reception circuit in telephone set having on-hook dial function | |
JPS57147367A (en) | Conference trunk | |
JPS5628591A (en) | Dial receiving system | |
JPS537105A (en) | Transmission relay exchange system for aural and facsimile signals | |
JPS6457891A (en) | Key telephone system | |
JPS54114912A (en) | Connection system of operator trunk | |
JPS5570194A (en) | Night main wire switching system | |
JPS57204670A (en) | Call monitoring system | |
JPS54134914A (en) | Remote subscriber connection system | |
JPS5781758A (en) | Signal transmitting system of switchboard | |
JPS55137754A (en) | Switch of telephone transmitter circuit | |
JPS6481491A (en) | Subscriber line terminator | |
JPS55125756A (en) | Connection test system for automatic exchanger | |
JPS56149856A (en) | Ring-back tone and call signal sending system | |
JPS577660A (en) | Connection system for link circuit | |
JPS57168565A (en) | Special common-battery service system | |
JPS577655A (en) | General multiple address transmission system | |
JPS6412752A (en) | Telephone conference connection system |