CN203801031U - Novel cable-television bidirectional access network system - Google Patents
Novel cable-television bidirectional access network system Download PDFInfo
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- CN203801031U CN203801031U CN201420140215.9U CN201420140215U CN203801031U CN 203801031 U CN203801031 U CN 203801031U CN 201420140215 U CN201420140215 U CN 201420140215U CN 203801031 U CN203801031 U CN 203801031U
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- 230000002457 bidirectional effect Effects 0.000 title claims abstract description 21
- 230000003287 optical effect Effects 0.000 claims abstract description 66
- 230000008054 signal transmission Effects 0.000 claims description 9
- 230000035945 sensitivity Effects 0.000 claims description 6
- 230000005540 biological transmission Effects 0.000 abstract description 7
- 238000005516 engineering process Methods 0.000 description 2
- 230000004941 influx Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000013307 optical fiber Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000010561 standard procedure Methods 0.000 description 1
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Abstract
A novel cable-television bidirectional access network system comprises a Mini CMTS local end. The Mini CMTS local end is connected with a light transmitting and receiving local end, the light transmitting and receiving local end is connected with a light demultiplexer, the light demultiplexer is connected with multiple RFoG optical stations, and each RFoG optical station is connected with a coaxial passive distribution network. The novel cable-television bidirectional access network system has the advantages that radiofrequency signals output by a Mini CMTS head end are converted into optical signals for transmission, so that the transmission distance is increased. The optical signals can be connected with multiple optical nodes via the four-path or eight-path light demultiplexer, each optical node covers 30 to 50 users, namely the amount of coverage users of the Mini CMTS head end is improved by four or eight times, and the average apportioned cost of users is reduced. The optical nodes respectively employ the RFoG optical stations, the optical signals are returned in an emergent light emission mode, and the echo gathering noise of the network is reduced.
Description
Technical field
The utility model belongs to optical communication technique field, especially relates to the two-way access net system of a kind of novel cable TV.
Background technology
At present, in broadcasting and TV NGB Access Network HINOC, Homeplug AV, the large standard technique of C-DOCSIS tri-, C-DOCSIS technology Yin Qiyan holds the advantages such as DOCSIS series international standard, CMTS+CM network compatibility, high-transmission bandwidth, is had an optimistic view of, at present in the stage of applying by industry.In broadcasting and TV Access Network, optical node generally adopts passive coaxial distribution network to user side, covers 30～50 family users.The C-DOCSIS headend mini CMTS that is positioned over optical node place exists and covers the problems such as user is few, overhead cost is high per family, coaxial transmission distance is limited in application process, becomes the bottleneck of spread.
Summary of the invention
The utility model provides a kind of two-way access net system of novel cable TV of overhead cost, reduction network passback influx noise per family of extending transmission distance, reduce.
The technical solution adopted in the utility model is:
The two-way access net system of a kind of novel cable TV, it is characterized in that: comprise Mini CMTS local side, light transmitting-receiving local side, optical branching device, RFoG light station, coaxial passive distribution net, described Mini CMTS local side is connected with light transmitting-receiving local side, described light transmitting-receiving local side is connected with optical branching device, and described optical branching device is connected with multiple RFoG light station, is all connected with a coaxial passive distribution net on each described RFoG light station.
Further, described light transmitting-receiving local side comprises the first bidirectional filter with the mutual radiofrequency signal of Mini CMTS local side, described the first bidirectional filter is connected with the straight light modulation radiating circuit of descending 1550nm, the straight light modulation radiating circuit of described descending 1550nm is connected with first wave division multiplexer, described first wave division multiplexer is connected with up high sensitivity optical receiving circuit, described up high sensitivity optical receiving circuit is connected with the first bidirectional filter, and the optical signal transmission end of described first wave division multiplexer connects with the optical branching device that can be connected 4 or 8 optical nodes.
Further, described RFoG light station comprises the Second Wave division multiplexer being connected with optical branching device, described Second Wave division multiplexer is connected with descending optical receiving circuit, described descending optical receiving circuit is connected with the second bidirectional filter, described the second bidirectional filter is connected with uplink burst mode light radiating circuit, described uplink burst mode light radiating circuit is connected with Second Wave division multiplexer, and the radio signal transmission end of described the second bidirectional filter is connected with coaxial passive distribution net.
Further, described optical branching device is 4 roads or No. 8 optical branching devices.
The radiofrequency signal of Mini CMTS local side output of the present utility model is received and dispatched local side by light and is converted to optical signal transmission, realize point-to-multipoint Optical Distribution Network framework by optical branching device again, RFoG light station converts back radiofrequency signal light signal and inputs coaxial passive distribution net, and the user that coaxial passive distribution net is realized 30～50 families covers.
The beneficial effects of the utility model are mainly manifested in: the radiofrequency signal of Mini CMTS head end output converts optical signal transmission to, utilizes the feature that Optical Fiber Transmission is less than coaxial cable loss, extends transmission distance.Light signal can connect multiple optical nodes by optical branching device, conventionally adopts No. 4 optical branching devices or No. 8 optical branching devices, the same covering of each optical node 30～50 family users, i.e. and Mini CMTS head end covering number of users can improve 4 times or 8 times, reduces overhead cost per family.Optical node place adopts RFoG light station, and burst optical transmission mode passback light signal, reduces network passback influx noise.
Brief description of the drawings
Fig. 1 is structural representation of the present utility model.
Fig. 2 is the structural representation of light transmitting-receiving local side of the present utility model.
Fig. 3 is the structural representation at RFoG light of the present utility model station.
Embodiment
Below in conjunction with specific embodiment, the utility model is further described, but the utility model is not confined to these embodiments.One skilled in the art would recognize that the utility model contained all alternatives, improvement project and the equivalents that within the scope of claims, may comprise.
With reference to Fig. 1, the two-way access net system of a kind of novel cable TV, comprise Mini CMTS local side 1, light transmitting-receiving local side 2, optical branching device 3, RFoG light station 4, coaxial passive distribution net 5, described Mini CMTS local side 1 is connected with light transmitting-receiving local side 2, and described light transmitting-receiving local side 2 is connected with optical branching device 3, described optical branching device 3 is connected with multiple RFoG light station 4, is all connected with a coaxial passive distribution net 5 on each described RFoG light station 4.
The radiofrequency signal that Mini CMTS local side 1 of the present utility model is exported is received and dispatched local side 2 by light and is converted to optical signal transmission, realize point-to-multipoint Optical Distribution Network framework by optical branching device 3 again, RFoG light station 4 converts back radiofrequency signal light signal and inputs coaxial passive distribution net 5, and the user that coaxial passive distribution net 5 is realized 30～50 families covers.
With reference to Fig. 2, described light transmitting-receiving local side 2 adopts the ZBL5061T type light transmitting-receiving local side of Guangdian Science & Technology Co., Ltd., Zhejiang, it comprises the first bidirectional filter 21 with Mini CMTS local side 1 mutual radiofrequency signal, described the first bidirectional filter 21 is connected with the straight light modulation radiating circuit 22 of descending 1550nm, the straight light modulation radiating circuit 22 of described descending 1550nm is connected with first wave division multiplexer 24, described first wave division multiplexer 24 is connected with up high sensitivity optical receiving circuit 23, described up high sensitivity optical receiving circuit 23 is connected with the first bidirectional filter 21, the optical signal transmission end of described first wave division multiplexer 24 connects with the optical branching device 3 that can be connected 4 or 8 optical nodes.
With reference to Fig. 3, described RFoG light station 4 adopts the ZBL5061RB type light station of Guangdian Science & Technology Co., Ltd., Zhejiang, it comprises the Second Wave division multiplexer 41 being connected with optical branching device 3, described Second Wave division multiplexer 41 is connected with descending optical receiving circuit 42, described descending optical receiving circuit 42 is connected with the second bidirectional filter 44, described the second bidirectional filter 44 is connected with uplink burst mode light radiating circuit 43, described uplink burst mode light radiating circuit 43 is connected with Second Wave division multiplexer 41, the radio signal transmission end of described the second bidirectional filter 44 is connected with coaxial passive distribution net 5.
Described optical branching device 3 is 4 roads or No. 8 optical branching devices, the same covering of each optical node 30～50 family users.
Claims (4)
1. the two-way access net system of novel cable TV, it is characterized in that: comprise Mini CMTS local side, light transmitting-receiving local side, optical branching device, RFoG light station, coaxial passive distribution net, described Mini CMTS local side is connected with light transmitting-receiving local side, described light transmitting-receiving local side is connected with optical branching device, and described optical branching device is connected with multiple RFoG light station, is all connected with a coaxial passive distribution net on each described RFoG light station.
2. the two-way access net system of the novel cable TV of one according to claim 1, it is characterized in that: described light transmitting-receiving local side comprises the first bidirectional filter with the mutual radiofrequency signal of Mini CMTS local side, described the first bidirectional filter is connected with the straight light modulation radiating circuit of descending 1550nm, the straight light modulation radiating circuit of described descending 1550nm is connected with first wave division multiplexer, described first wave division multiplexer is connected with up high sensitivity optical receiving circuit, described up high sensitivity optical receiving circuit is connected with the first bidirectional filter, the optical signal transmission end of described first wave division multiplexer connects with the optical branching device that can be connected 4 or 8 optical nodes.
3. the two-way access net system of the novel cable TV of one according to claim 1, it is characterized in that: described RFoG light station comprises the Second Wave division multiplexer being connected with optical branching device, described Second Wave division multiplexer is connected with descending optical receiving circuit, described descending optical receiving circuit is connected with the second bidirectional filter, described the second bidirectional filter is connected with uplink burst mode light radiating circuit, described uplink burst mode light radiating circuit is connected with Second Wave division multiplexer, and the radio signal transmission end of described the second bidirectional filter is connected with coaxial passive distribution net.
4. according to the two-way access net system of the novel cable TV of the one one of claim 1 ~ 3 Suo Shu, it is characterized in that: described optical branching device is 4 roads or No. 8 optical branching devices.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420140215.9U CN203801031U (en) | 2014-03-26 | 2014-03-26 | Novel cable-television bidirectional access network system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420140215.9U CN203801031U (en) | 2014-03-26 | 2014-03-26 | Novel cable-television bidirectional access network system |
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| Publication Number | Publication Date |
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| CN203801031U true CN203801031U (en) | 2014-08-27 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201420140215.9U Expired - Fee Related CN203801031U (en) | 2014-03-26 | 2014-03-26 | Novel cable-television bidirectional access network system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105282632A (en) * | 2015-11-16 | 2016-01-27 | 无锡路通视信网络股份有限公司 | Optical mixer, up link for DOCSIS3.0 or higher system, and method for eliminating optical beat interference of the up link |
-
2014
- 2014-03-26 CN CN201420140215.9U patent/CN203801031U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105282632A (en) * | 2015-11-16 | 2016-01-27 | 无锡路通视信网络股份有限公司 | Optical mixer, up link for DOCSIS3.0 or higher system, and method for eliminating optical beat interference of the up link |
| CN105282632B (en) * | 2015-11-16 | 2019-05-07 | 无锡路通视信网络股份有限公司 | Optical mixer, DOCSIS3.0 system above uplink and eliminate its optical beat interference method |
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| 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: 20140827 |
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| CF01 | Termination of patent right due to non-payment of annual fee |