CN2263425Y - Program-control switchboard subscriber interface feeding device - Google Patents
Program-control switchboard subscriber interface feeding device Download PDFInfo
- Publication number
- CN2263425Y CN2263425Y CN 96208338 CN96208338U CN2263425Y CN 2263425 Y CN2263425 Y CN 2263425Y CN 96208338 CN96208338 CN 96208338 CN 96208338 U CN96208338 U CN 96208338U CN 2263425 Y CN2263425 Y CN 2263425Y
- Authority
- CN
- China
- Prior art keywords
- link
- resistance
- triode
- feed circuit
- negative pole
- 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.)
- Expired - Fee Related
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- Interface Circuits In Exchanges (AREA)
- Devices For Supply Of Signal Current (AREA)
Abstract
The utility model discloses a subscriber interface feeding device for a program-control switchboard, which comprises a DC power supply, a constant current feeding circuit, a subscriber line, etc., wherein, the upper half part of the constant current feeding circuit is composed of resistors R2, R3, R6, diodes D1, D2, a capacitor C6 and a transistor T8, and the lower half part is composed of a resistor R1, diodes D3, D4 and a transistor T9. Because the subscriber interface feeding device of the utility model is adopted in a program-control switchboard, the feeding internal resistance of a subscriber loop is reduced and can reach national standards. In addition, the simple structure can be fabricated by thick film technology.
Description
The utility model is the interface arrangement about telephonic communication system, more particularly about stored-program control exchange user interface feeder equipment.
The existing switch user interface mainly adopts following two kinds of mode feeds, and first kind is constant-voltage feeding, and feed current changes with load resistance, and hour power consumption is bigger for load resistance; Second kind is the constant-current source feed that adopts triode to constitute, and voltage drop is to responsive to temperature between transistor base and emitter, and feed current raises with ambient temperature and reduces.
The purpose of this utility model is to adopt the thick-film technique technology to make the exchanger user interface feeder equipment that a kind of feed current is not subjected to load resistance and ambient temperature effect.
Of the present utility model this will further set forth by following description and illustrate with other purpose.
Stored-program control exchange user interface feeder equipment of the present utility model is made up of direct power supply, constant current feed circuit, subscriber's line etc., and constant current feed circuit is by triode T
8, T
9, T
10And diode D
1, D
2, D
3, D
4Etc. formation, subscribers feeder loop resistance R
LBe connected between joint TIP and the bell RING resistance R
2, R
3, R
6, diode D
1, D
2, capacitor C
6, triode T
8Constitute first branch road feed circuit; Resistance R
1, diode D
3, D
4, triode T
9Constitute second branch road feed circuit; Resistance R
25, R
36, triode T
10Constitute dislodging machine automatic switch biasing circuit.
In stored-program control exchange, owing to adopted user interface feeder equipment of the present utility model, the internal resistance of local loop feed is reduced greatly, reached national standard, and simple in structure, be easy to produce in batches the thick-film electronic device.
Below further specify the utility model by accompanying drawing and explanation thereof.
Fig. 1 is circuit theory diagrams of the present utility model.
In Fig. 1, described constant current feed circuit is by triode T
8, T
9, T
10And diode D
1, D
2, D
3, D
4Etc. formation, wherein, subscribers feeder loop resistance R
LBe connected between joint TIP and the bell RING resistance R
2, R
3, R
6, diode D
1, D
2, capacitor C
6, triode T
8Constitute first branch road feed circuit, R
2, R
3, D
1An end and joint V
BGNDConnect R
2The other end and T
8Emitter link to each other D
1Negative pole and D
2Positive pole link to each other T
8Base stage and D
2Negative pole, T
10Emitter link to each other R
3The other end and capacitor C
6, resistance R
6An end link to each other R
6, C
6The other end, T
8Collector electrode, resistance R
36An end and joint V
TIPLink to each other; Resistance R
1, diode D
3, D
4, triode T
9Constitute second branch road feed circuit, R
1An end, D
4Negative pole and joint V
BATLink to each other R
1The other end and T
9Emitter link to each other D
4Positive pole and D
3Negative pole connect T
9Base stage and D
3Positive pole, resistance R
25An end link to each other T
9Collector electrode link to each other with bell RING; Resistance R
36, triode T
10, resistance R
25Constitute dislodging machine automatic switch biasing circuit, R
36The other end and T
10Base stage link to each other T
10Collector electrode and R
25An end connect.
In the utility model, when on-hook, resistance R
LOpen circuit, joint TIP terminal potential are zero, triode T
10No base bias power supply and ending, thus make triode T
8, T
9End, present high impedance over the ground and on joint TIP and bell RING line, can realize the signal transmission when making on-hook, avoided when on-hook T
8, T
9The feedback and and can not transmission signals.
Constant current feed circuit of the present utility model inserts in the user's interface device in a usual manner, and concrete connection is known by this specialty, does not remake statement at this.
The utility model is realized stable feed current by low internal resistance feeder equipment, and making the loop internal resistance minimum is 500 Ω, still can keep the above loop current of 18mA when loop resistance is 2K, has met and exceeded the standard of the Ministry of Posts and Telecommunications.
Claims (1)
1, a kind of stored-program control exchange user interface feeder equipment, by DC power supply, constant current feed circuit, formations such as subscriber's line is characterized in that described constant current feed circuit is by triode T
8, T
9, T
10And diode D
1, D
2, D
3, D
4Etc. formation, wherein, subscribers feeder loop resistance R
LBe connected between joint TIP and the bell RING resistance R
2, R
3, R
6, diode D
1, D
2, capacitor C
6, triode T
8Constitute first branch road feed circuit, R
2, R
3, D
1An end and joint V
BGNDConnect R
2The other end and T
8Emitter link to each other D
1Negative pole and D
2Positive pole link to each other T
8Base stage and D
2Negative pole, T
10Emitter link to each other R
3The other end and capacitor C
6, resistance R
6An end link to each other R
6, C
6The other end, T
8Collector electrode, resistance R
36An end and joint V
TIPLink to each other; Resistance R
1, diode D
3, D
4, triode T
9Constitute second branch road feed circuit, R
1An end, D
4Negative pole and battery V
BATLink to each other R
1The other end and T
9Emitter link to each other D
4Positive pole and D
3Negative pole connect T
9Base stage and D
3Positive pole, resistance R
25An end link to each other T
9Collector electrode link to each other with bell RING; Resistance R
36, triode T
10, R
25Constitute dislodging machine automatic switch biasing circuit, R
36The other end and T
10Base stage link to each other T
10Collector electrode and R
25An end connect.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN 96208338 CN2263425Y (en) | 1996-04-05 | 1996-04-05 | Program-control switchboard subscriber interface feeding device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN 96208338 CN2263425Y (en) | 1996-04-05 | 1996-04-05 | Program-control switchboard subscriber interface feeding device |
Publications (1)
Publication Number | Publication Date |
---|---|
CN2263425Y true CN2263425Y (en) | 1997-09-24 |
Family
ID=33892376
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CN 96208338 Expired - Fee Related CN2263425Y (en) | 1996-04-05 | 1996-04-05 | Program-control switchboard subscriber interface feeding device |
Country Status (1)
Country | Link |
---|---|
CN (1) | CN2263425Y (en) |
-
1996
- 1996-04-05 CN CN 96208338 patent/CN2263425Y/en not_active Expired - Fee Related
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
C14 | Grant of patent or utility model | ||
GR01 | Patent grant | ||
C19 | Lapse of patent right due to non-payment of the annual fee | ||
CF01 | Termination of patent right due to non-payment of annual fee |