CN202535365U - Noise suppression circuit of HFC reverse receiver - Google Patents
Noise suppression circuit of HFC reverse receiver Download PDFInfo
- Publication number
- CN202535365U CN202535365U CN2012200276997U CN201220027699U CN202535365U CN 202535365 U CN202535365 U CN 202535365U CN 2012200276997 U CN2012200276997 U CN 2012200276997U CN 201220027699 U CN201220027699 U CN 201220027699U CN 202535365 U CN202535365 U CN 202535365U
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- noise
- hfc
- suppression circuit
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Abstract
The utility model relates to a noise suppression circuit of an HFC reverse receiver. An optical input terminal connects with a photoelectric converter. One end of the photoelectric converter connects with a preamplifier while the other end of the photoelectric converter connects with a processor through an offset unit and the photoelectric converter is used for monitoring a power source. The preamplifier connects with an attenuator. The attenuator connects with a coupler. The coupler connects with a pilot frequency filter and a pilot frequency wave trap and then is connected to a radio frequency output terminal and a radio frequency testing terminal through a coupler for detecting signals. By using the noise suppression circuit of the HFC reverse receiver, the reverse network maintenance cost can be reduced, the maintenance convenience can be improved, the operation and maintenance efficiency can be improved, and the operation and maintenance can be reduced.
Description
Technical field
The utility model relates to integrated digital service broadband networks access technology, and the receiver noise that is specifically related in a kind of return link suppresses circuit.
Background technology
HFC is the hybrid network that optical fiber and coaxial cable combine; Usually form by fiber optic backbone, coaxial cable branch line, subscriber distribution network network three parts; The programme signal of coming out from cable TV becomes light signal earlier and transmits at main line; Behind the user area, convert light signal to the signal of telecommunication, after distributor distributes, deliver to the user through coaxial cable.Because the HFC transmission capacity is big, be prone to realize transmitted in both directions, use also extensive gradually, also increasingly high for the stability requirement of reverse link.Noise is mainly derived from three aspects, invades noise, cabling architecture noise, optical fiber link noise.The intrusion noise is caused that by the external environment condition at cable system place the tree structure of the cable system of HFC net is collected various interference signals just as huge distribution antenna, forms and disturbs; The cabling architecture noise is mainly thermal noise, the public passage distortion of cable joint generation and the combination intermodulation of active equipment nonlinear distortion that active device produces; The optical fiber link noise is the noise that fibre loss etc. produces.The local side apparatus of prior art does not possess special reverse noise suppression circuit, but on client device, uses noise suppression circuit on reverse link, in operation management, the mode that adopts the terminal light device to cut-off is carried out the investigation of noise.When client was used noise suppression circuit, aspect the installation O&M, the mode of investigation fault was single; All need the O&M personnel to operate simultaneously at local side and terminal equipment place, the management cost that needs is high, safeguards inconvenient; Poor in timeliness, manpower and management cost are very high.
The utility model content
The purpose of the utility model is that noise suppression circuit is set in reverse link, has reduced the inverse noise in the return link and has converged, and reduces reverse network operation cost, increases the convenience of safeguarding, improves O&M efficient, saves O&M cost.
For achieving the above object, the utility model adopts following technical scheme:
The reverse receiver noise of a kind of HFC suppresses circuit, and light input end connects an optical-electrical converter, carries out the conversion of photosignal; Optical-electrical converter one end connects preamplifier signal is amplified, and the other end connects bias unit, is used to monitor power supply; Preamplifier connects attenuator, attenuator connection processing device, and processor control attenuation suppresses noise; Attenuator connects coupler signal is carried out shunt, and coupler connects pilot filter and pilot tone trapper respectively, is used for filtered signal; The pilot tone trapper further connects amplifier to regulate power gain, is connected to RF output end through coupler then and the radio frequency testing end detects signal.
Through noise suppression circuit is set, reduced the inverse noise in the return link and converged, the client can be flexibly according to network condition separately; Suppress network noise, the good property of assurance network is made an uproar than index, and need all not arrange the O&M personnel to operate simultaneously at local side and terminal equipment place; Reduce reverse network operation cost; Increase the convenience of safeguarding, improve O&M efficient, save O&M cost.
Description of drawings
Fig. 1 is that the reverse receiver noise of HFC suppresses circuit figure.
Embodiment
Below in conjunction with description of drawings the utility model is further described:
The reverse receiver noise of this HFC suppresses circuit, after the light signal input, at first converts light signal into the signal of telecommunication through optical-electrical converter; Signal amplifies through amplifier, connects attenuator again, attenuator connection processing device; Thereby processor suppresses noise through the control attenuation; Through coupler along separate routes, coupler connects pilot filter and pilot tone trapper respectively, is used for filtered signal then; The pilot tone trapper further connects amplifier to regulate power gain, is connected to RF output end through coupler then and the radio frequency testing end detects signal.Through noise suppression circuit is set in receiver, the client can be flexibly according to network condition separately, suppress network noise; The good property of assurance network is made an uproar and is compared index; And need all not arrange the O&M personnel to operate simultaneously, reduce reverse network operation cost, increase the convenience of safeguarding at local side and terminal equipment place; Improve O&M efficient, save O&M cost.
It will be recognized by those skilled in the art, under the prerequisite that does not depart from protection scope of the present invention, can carry out various modifications, variation and combination, and think that this modification, variation and combination are within the scope of originality thought above-mentioned execution mode.
Claims (1)
1. the reverse receiver noise of HFC suppresses circuit, and it is characterized in that: light input end connects an optical-electrical converter, and optical-electrical converter one end connects preamplifier signal is amplified; The other end connects a bias unit, is used to monitor power supply, and preamplifier connects attenuator; Attenuator connection processing device; Processor control attenuation suppresses noise, and coupler connects pilot filter and pilot tone trapper respectively, and the pilot tone trapper is connected to RF output end and radio frequency testing end through coupler.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200276997U CN202535365U (en) | 2012-01-21 | 2012-01-21 | Noise suppression circuit of HFC reverse receiver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200276997U CN202535365U (en) | 2012-01-21 | 2012-01-21 | Noise suppression circuit of HFC reverse receiver |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202535365U true CN202535365U (en) | 2012-11-14 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012200276997U Expired - Fee Related CN202535365U (en) | 2012-01-21 | 2012-01-21 | Noise suppression circuit of HFC reverse receiver |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202535365U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106788755A (en) * | 2016-12-14 | 2017-05-31 | 鼎点视讯科技有限公司 | Point-to-point light transmitting and receiving system, CCMTS equipment and broadcasting and TV bilateral construction net system |
-
2012
- 2012-01-21 CN CN2012200276997U patent/CN202535365U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106788755A (en) * | 2016-12-14 | 2017-05-31 | 鼎点视讯科技有限公司 | Point-to-point light transmitting and receiving system, CCMTS equipment and broadcasting and TV bilateral construction net system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121114 Termination date: 20190121 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |