CN102368814A - Automatic switching circuit of optical receiver of cable television - Google Patents
Automatic switching circuit of optical receiver of cable television Download PDFInfo
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- CN102368814A CN102368814A CN2011103286191A CN201110328619A CN102368814A CN 102368814 A CN102368814 A CN 102368814A CN 2011103286191 A CN2011103286191 A CN 2011103286191A CN 201110328619 A CN201110328619 A CN 201110328619A CN 102368814 A CN102368814 A CN 102368814A
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Abstract
The invention, which belongs to the cable television technology field, relates to an automatic switching circuit of an optical receiver of a cable television. The automatic switching circuit comprises a capacitor C1-C18, an electrolytic capacitor C19, a resistor R1-R16, an inductance L1-L6, a diode D3-D5, PIN tubes D1 and D2, a triode Q1, an amplifier tube U1, an operation amplifier U2, a relay K1, signal couplers Z1 and Z2, and an adjustable potentiometer Rt1, wherein the D1 and the D2 are optical receiving PIN tubes and the U1 is an F226 amplifier tube. Advantages of the automatic switching circuit are as follows: network reliability is improved as well as operation and maintenance costs are reduced.
Description
Technical field
The present invention relates to a kind of cable TV optical receiver automatic switch-over circuit, belong to the cable TV technical field, especially the transformation of hybrid fiber coax bilateral network is a kind of based on cable TV transmitted in both directions equipment
Background technology
21st century, living standards of the people improve constantly, and cultural life is dominate.China's hfc plant is according to its distinctive advantage, extremely wide transmission band, abundant frequency resource, access way and relatively low technical cost easily; And be the most competitive mode of unification of three nets, this generally acknowledges, becomes a kind of broadband access method that prospect is expected most for industry.Just because of this; Two-way in recent years high frequency cable (HFC) network has obtained development fast, and along with the continuous expansion of cable TV network, the continuous development of network technology, network size and amount of equipment, kind grow with each passing day; Cable TV industrialization demand; Carrying out of each item value-added service had higher requirement to reliability, transmission quality, the service quality of network, and this has proposed challenge for Network Management.In fact, the expansion of network size and the increase of number of devices, calculator room equipment quantity constantly increases; System reliability can progressively reduce; A medium scale HFC main line network, the fault that signal interruption in a year, on average occurs possibly reach tens of times, and the time of the signal interruption that produces therefrom can reach ten hours; This is certain to the consequence of bringing on a disaster property for utilizing two-way hfc plant to come the operator of management data and voice.
How
have managed hfc plant, find early and get rid of potential potential faults, promote the reliability of network comprehensively; Guaranteeing the effective stable operation of network, is the problem that network equipment supplier and network service operators all are concerned about, the unilateral network in past; Can be described as and lean on user oneself to find and lodge a complaint and report fault, lean on attendant's experience to go judgement and search fault, this out-dated management styles; Must cause network to interrupt frequently, serious even paralysis that can cause network, recovery time is long; Maintenance workload is big, and maintenance cost increases.And will accomplish both to have prevented trouble before it happens, can practice thrift maintenance cost again, through the optical receiver automatic switching function; Light signal when one tunnel occurs automatically switching to another road when unusual, and reminds the network management personnel through the hfc plant management with the sound and light alarm form; Equipment to decreased performance or damage positions, and brings great convenience for safeguarding or changing new equipment, so just significantly reduces the generation of network failure; Eliminate or shorten the interruption of network signal; Improve the managerial ability of hfc plant, improve the reliability of network as much as possible, reduce operation and maintenance cost
Summary of the invention
the purpose of this invention is to provide a kind of cable TV optical receiver automatic switch-over circuit that improves network reliability, reduces operation and maintenance cost.
the objective of the invention is to reach like this, and a kind of cable TV optical receiver automatic switch-over circuit comprises capacitor C 1-C18, electrochemical capacitor C19, resistance R 1-R16, inductance L 1-L6, diode D3-D5, PIN pipe D1, D2, triode Q1, amplifier tube U1, amplifier U2, relay K 1, signal coupler Z1, Z2 and adjustable potentiometer Rt1, and wherein D1, D2 are light-receiving PIN pipe; U1 is the F226 amplifier tube, and the negative pole of PIN pipe D1 connects an end of inductance L 1, the input of another termination signal coupler Z1 of inductance L 1, and the centre cap of signal coupler Z1 connects an end of capacitor C 1; 3 pin of another relay termination K1 of capacitor C 1, the output termination capacitor C 8 of signal coupler Z1, an end of resistance R 3, the other end ground connection of capacitor C 8, an end of the other end connecting resistance R2 of resistance R 3, R13, capacitor C 7; The other end ground connection of resistance R 13, capacitor C 7, another termination direct voltage+24V of resistance R 2, PIN pipe D1 grounding leg ground connection, PIN pipe D1 positive pole connects an end of inductance L 2; One end of the other end connecting resistance R1 of inductance L 2, R12, capacitor C 5, the other end ground connection of resistance R 12, capacitor C 5, a termination single-chip microcomputer of the other end of resistance R 1, capacitor C 6, resistance R 8, the other end ground connection of capacitor C 6; 2 pin of another termination amplifier U2 of resistance R 8, the negative pole of PIN pipe D2 connects an end of inductance L 3, the input of another termination signal coupler Z2 of inductance L 3, the centre cap of signal coupler Z2 connects an end of capacitor C 2; 4 pin of another relay termination K1 of capacitor C 2, the output termination capacitor C 12 of signal coupler Z2, an end of resistance R 6, the other end ground connection of capacitor C 12; One end of the other end connecting resistance R5 of resistance R 6, R15, capacitor C 11, the other end ground connection of resistance R 15, capacitor C 11, another termination direct voltage+24V of resistance R 5; PIN pipe D2 grounding leg ground connection, PIN pipe D2 positive pole connects an end of inductance L 4, an end of the other end connecting resistance R4 of inductance L 4, R14, capacitor C 9; The other end ground connection of resistance R 14, capacitor C 9, a termination single-chip microcomputer of the other end of resistance R 4, capacitor C 10, resistance R 7, the other end ground connection of capacitor C 10; 3 pin of one end of another termination capacitor C 14 of resistance R 7,1 pin of adjustable potentiometer Rt1, amplifier U2,2, the 3 pin ground connection of the other end of capacitor C 14, adjustable potentiometer Rt1, a termination direct voltage+24V of 8 pin of amplifier U2, capacitor C 13, resistance R 9; The other end ground connection of capacitor C 13,7 pin of amplifier U2 are unsettled, and 5,6 pin of amplifier U2 connect; The 4 pin ground connection of amplifier U2, the end of the 1 pin connecting resistance R16 of amplifier U2, diode D5 negative pole, the other end ground connection of resistance R 16; One end of the anodal connecting resistance R10 of diode D5, capacitor C 16, another termination triode Q1 base stage of resistance R 10, the other end ground connection of triode Q1 emitter and capacitor C 16; Triode Q1 collector electrode connects that diode D3 is anodal, 2 pin of relay K 1, and diode D3 negative pole connects that an end, 1 pin of relay K 1, diode D4 negative pole, the electrochemical capacitor C19 of capacitor C 15 is anodal, the other end of resistance R 9, the other end of capacitor C 15, anodal, the electrochemical capacitor C19 minus earth of diode D4; 5 pin of relay K 1 connect an end of capacitor C 3,1 pin of another termination amplifier tube U1 of capacitor C 3, the 2 pin ground connection of amplifier tube U1; 3 pin of amplifier tube U1 connect an end of inductance L 6, capacitor C 4, another termination capacitor C 17 of inductance L 6, an end of resistance R 11, a termination direct voltage+8V of the other end of resistance R 11, capacitor C 18; The other end ground connection of capacitor C 17, C18, an end of another termination inductance L 5 of capacitor C 4, the other end output signal of inductance L 5 is to the light agc circuit.
the present invention is owing to adopted above technical scheme, and it has improved network reliability, has reduced operation and maintenance cost.
Description of drawings
Fig. 1 is a schematic diagram of the present invention.
Embodiment
are referring to figure: cable TV optical receiver automatic switch-over circuit is that the cable TV two ways of optical signals connects light-receiving PIN pipe D1, D2 respectively; The PIN plumber does; Luminous power according to input is different, and output voltage drives relay work through comparison circuit, and the radiofrequency signal of PIN pipe output connects the signal input part of relay respectively; Switching through relay realizes uninterrupted output radiofrequency signal to amplifying circuit, completion cable TV optical receiver automatic switching function.Cable TV light signal input PIN pipe D1; Form power supply circuits by direct voltage+24V, resistance R 2, R3, R13, capacitor C 7, C8, signal coupler Z1, inductance L 1; Driving PIN pipe D1 work, the output radiofrequency signal arrives 3 pin of relay K 1 through inductance L 1, signal coupler Z1, capacitor C 1; The anodal output voltage of PIN pipe D1 to single-chip microcomputer, arrives 2 pin of amplifier U2 through inductance L 2, resistance R 1, R12, capacitor C 5, C6 through resistance R 8; Cable TV light signal input PIN pipe D2; Form power supply circuits by direct voltage+24V, resistance R 5, R6, R15, capacitor C 11, C12, signal coupler Z2, inductance L 3; Driving PIN pipe D2 work, the output radiofrequency signal arrives 4 pin of relay K 1 through inductance L 3, signal coupler Z2, capacitor C 2; The anodal output voltage of PIN pipe D2 to single-chip microcomputer, arrives 3 pin of amplifier U2 through inductance L 4, resistance R 4, R14, capacitor C 9, C10 through resistance R 7; Direct voltage+24V, amplifier U2, resistance R 9, R10, R16, capacitor C 14-C16, electrochemical capacitor C19, diode D3-D5, triode Q1, adjustable potentiometer Rt1 form comparison circuit, drive relay K 1 work; The 5 pin output signal of relay K 1 is through 1 pin of capacitor C 3 to amplifier tube U1; Form power supply circuits by direct voltage+8V, resistance R 11, capacitor C 17, C18, inductance L 6; Drive amplifier tube U1 work; The 3 pin output amplifying signal of amplifier tube U1 to light AGC (automatic gain control) circuit, is accomplished the optical receiver automatic switching function through capacitor C 4, inductance L 5.Wherein C1-C4 is the high frequency capacitance, and C5-C18 is a high-frequency filter capacitor, and C19 is an electrochemical capacitor, and R1-R11 is a current-limiting resistance; R12-R15 is a dropping resistor, and L1-L5 is an air core inductor, and L6 is the High frequency filter inductance, and D3 is the 1N4148 diode; D4-D5 is a voltage stabilizing didoe, and Q1 is 3904 triodes, and Rt1 is an adjustable potentiometer, and K1 is an Omron G5V-1 signal relay; Z1, Z2 are signal coupler, and D1, D2 are light-receiving PIN pipe, and U1 is the F226 amplifier tube, and U2 is the LM258 amplifier.
the most attractive benefit of cable TV optical receiver automatic switch-over circuit is through the optical receiver automatic switching function; Significantly reduce the generation of network failure; Eliminate or shorten the interruption of network signal; Improve the reliability of network as much as possible, reduce operation and maintenance cost.When disposing solution, its following points technical advantage:
are network reliability 1.: two-way in recent years hfc plant has obtained development fast; Along with the continuous expansion of cable TV network, the continuous development of network technology; Network size and amount of equipment, kind grow with each passing day, the expansion of network size and the increase of number of devices, and calculator room equipment quantity constantly increases; System reliability can progressively reduce; A medium scale HFC main line network, the fault that signal interruption in a year, on average occurs possibly reach tens of times, and the time of the signal interruption that produces therefrom can reach ten hours; This is certain to the consequence of bringing on a disaster property for utilizing two-way hfc plant to come the operator of management data and voice.And will accomplish both to have prevented trouble before it happens, can practice thrift maintenance cost again, through the optical receiver automatic switching function, significantly reduce the generation of network failure, eliminate or shorten the interruption of network signal, improve the reliability of network as much as possible, reduce operation and maintenance cost.
are the manageability of network 2.: how to have managed hfc plant, found early and get rid of potential potential faults, promoted the reliability of network comprehensively; Guaranteeing the effective stable operation of network, is the problem that network equipment supplier and network service operators all are concerned about, the unilateral network in past; Can be described as and lean on user oneself to find and lodge a complaint and report fault, lean on attendant's experience to go judgement and search fault, this out-dated management styles; Must cause network to interrupt frequently, serious even paralysis that can cause network, recovery time is long; Maintenance workload is big, and maintenance cost increases.And will accomplish both to have prevented trouble before it happens; Can practice thrift maintenance cost again and remind the network management personnel with the sound and light alarm form through the hfc plant management; Equipment to decreased performance or damage positions, and brings great convenience for safeguarding or changing new equipment, so just significantly reduces the generation of network failure; Eliminate or shorten the interruption of network signal, improve the managerial ability of hfc plant
Claims (1)
1.
A kind of cable TV optical receiver automatic switch-over circuit is characterized in that comprising capacitor C 1-C18, electrochemical capacitor C19, resistance R 1-R16, inductance L 1-L6, diode D3-D5, PIN pipe D1, D2, triode Q1, amplifier tube U1, amplifier U2, relay K 1, signal coupler Z1, Z2 and adjustable potentiometer Rt1, and wherein D1, D2 are light-receiving PIN pipe, and U1 is the F226 amplifier tube; The negative pole of PIN pipe D1 connects an end of inductance L 1, the input of another termination signal coupler Z1 of inductance L 1, and the centre cap of signal coupler Z1 connects an end of capacitor C 1,3 pin of another relay termination K1 of capacitor C 1; The output termination capacitor C 8 of signal coupler Z1, an end of resistance R 3, the other end ground connection of capacitor C 8, an end of the other end connecting resistance R2 of resistance R 3, R13, capacitor C 7, the other end ground connection of resistance R 13, capacitor C 7; Another termination direct voltage+24V of resistance R 2, PIN pipe D1 grounding leg ground connection, PIN pipe D1 positive pole connects an end of inductance L 2, an end of the other end connecting resistance R1 of inductance L 2, R12, capacitor C 5; The other end ground connection of resistance R 12, capacitor C 5, a termination single-chip microcomputer of the other end of resistance R 1, capacitor C 6, resistance R 8, the other end ground connection of capacitor C 6,2 pin of another termination amplifier U2 of resistance R 8; The negative pole of PIN pipe D2 connects an end of inductance L 3, the input of another termination signal coupler Z2 of inductance L 3, and the centre cap of signal coupler Z2 connects an end of capacitor C 2; 4 pin of another relay termination K1 of capacitor C 2, the output termination capacitor C 12 of signal coupler Z2, an end of resistance R 6, the other end ground connection of capacitor C 12; One end of the other end connecting resistance R5 of resistance R 6, R15, capacitor C 11, the other end ground connection of resistance R 15, capacitor C 11, another termination direct voltage+24V of resistance R 5; PIN pipe D2 grounding leg ground connection, PIN pipe D2 positive pole connects an end of inductance L 4, an end of the other end connecting resistance R4 of inductance L 4, R14, capacitor C 9; The other end ground connection of resistance R 14, capacitor C 9, a termination single-chip microcomputer of the other end of resistance R 4, capacitor C 10, resistance R 7, the other end ground connection of capacitor C 10; 3 pin of one end of another termination capacitor C 14 of resistance R 7,1 pin of adjustable potentiometer Rt1, amplifier U2,2, the 3 pin ground connection of the other end of capacitor C 14, adjustable potentiometer Rt1, a termination direct voltage+24V of 8 pin of amplifier U2, capacitor C 13, resistance R 9; The other end ground connection of capacitor C 13,7 pin of amplifier U2 are unsettled, and 5,6 pin of amplifier U2 connect; The 4 pin ground connection of amplifier U2, the end of the 1 pin connecting resistance R16 of amplifier U2, diode D5 negative pole, the other end ground connection of resistance R 16; One end of the anodal connecting resistance R10 of diode D5, capacitor C 16, another termination triode Q1 base stage of resistance R 10, the other end ground connection of triode Q1 emitter and capacitor C 16; Triode Q1 collector electrode connects that diode D3 is anodal, 2 pin of relay K 1, and diode D3 negative pole connects that an end, 1 pin of relay K 1, diode D4 negative pole, the electrochemical capacitor C19 of capacitor C 15 is anodal, the other end of resistance R 9, the other end of capacitor C 15, anodal, the electrochemical capacitor C19 minus earth of diode D4; 5 pin of relay K 1 connect an end of capacitor C 3,1 pin of another termination amplifier tube U1 of capacitor C 3, the 2 pin ground connection of amplifier tube U1; 3 pin of amplifier tube U1 connect an end of inductance L 6, capacitor C 4, another termination capacitor C 17 of inductance L 6, an end of resistance R 11, a termination direct voltage+8V of the other end of resistance R 11, capacitor C 18; The other end ground connection of capacitor C 17, C18, an end of another termination inductance L 5 of capacitor C 4, the other end output signal of inductance L 5 is to the light agc circuit
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011103286191A CN102368814A (en) | 2011-10-26 | 2011-10-26 | Automatic switching circuit of optical receiver of cable television |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011103286191A CN102368814A (en) | 2011-10-26 | 2011-10-26 | Automatic switching circuit of optical receiver of cable television |
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| CN102368814A true CN102368814A (en) | 2012-03-07 |
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| CN2011103286191A Pending CN102368814A (en) | 2011-10-26 | 2011-10-26 | Automatic switching circuit of optical receiver of cable television |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103914010A (en) * | 2014-01-21 | 2014-07-09 | 珠海柏卫宽带电子有限公司 | Radio-frequency change-over switch capable of keeping original communication state when powered off |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101340244A (en) * | 2008-08-08 | 2009-01-07 | 宁波环球广电科技有限公司 | Optical receiving module |
| JP4564745B2 (en) * | 2003-12-15 | 2010-10-20 | ミハル通信株式会社 | ONU for subscribers with input switching function in FTTH system |
| CN201733392U (en) * | 2009-10-10 | 2011-02-02 | 陕西极众电子科技有限公司 | Electric amplification-optical receiving integrated device of wired television transmission network |
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2011
- 2011-10-26 CN CN2011103286191A patent/CN102368814A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4564745B2 (en) * | 2003-12-15 | 2010-10-20 | ミハル通信株式会社 | ONU for subscribers with input switching function in FTTH system |
| CN101340244A (en) * | 2008-08-08 | 2009-01-07 | 宁波环球广电科技有限公司 | Optical receiving module |
| CN201733392U (en) * | 2009-10-10 | 2011-02-02 | 陕西极众电子科技有限公司 | Electric amplification-optical receiving integrated device of wired television transmission network |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103914010A (en) * | 2014-01-21 | 2014-07-09 | 珠海柏卫宽带电子有限公司 | Radio-frequency change-over switch capable of keeping original communication state when powered off |
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Application publication date: 20120307 |