CN1140089C - Wideband access method by using combination of HFC and local area network - Google Patents
Wideband access method by using combination of HFC and local area network Download PDFInfo
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- CN1140089C CN1140089C CNB011294590A CN01129459A CN1140089C CN 1140089 C CN1140089 C CN 1140089C CN B011294590 A CNB011294590 A CN B011294590A CN 01129459 A CN01129459 A CN 01129459A CN 1140089 C CN1140089 C CN 1140089C
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Abstract
The present invention relates to a method for broadband access by combining an available wire television HFC network and a local area network, which comprises: a branch distributor is additionally arranged in the front part of an input or in the rear part of an output of a building head amplifier, one signal is branched out to be connected with a cable modem, and ethernet is utilized as a distribution network to provides broadband access service for a user; meanwhile, reverse back transmission noise intruded from the wire television distribution network is filtered out by a high-speed filter under the circumstance that the branch distributor is arranged in the front part of thei nput of the amplifier, or the reverse back transmission noise intruded from the wire television distribution network is filtered out by a method that a reverse amplification module is not arranged in the amplifier when the branch distributor is arranged in the front part of the building head amplifier. The method of the present invention greatly reduces the intruded noise in the HFC network and greatly reduces the manufacturing cost of the entire network.
Description
The present invention relates to a kind of network communication method, particularly a kind of existing cable TV optical fiber/coaxial cable hybrid network (HFC) and local anastomose of utilizing closes the method for carrying out broadband access.
Utilize the optical fiber/coaxial cable hybrid network transmission of data signals of cable TV, carrying out broadband access is a kind of emerging technology.It has utilized the very wide cable TV optical fiber of existing coverage rate/coaxial cable mixed transport network, has avoided repeated construction main line network in the sub-district, thereby improves the utilance of hfc plant and save Internet resources.
The One-to-All Broadcast mode that is transmitted as of traditional tv program is transmitted, and therefore original hfc plant only has the one-way transmission ability.The interactive characteristics that data are used require network should possess two-way transmittability, and two-way hfc plant provides a kind of total solution for the cable TV subscriber.By bidirectional rebuilding, make the HFC netting gear be equipped with two-way transmission capabilities to hfc plant.The data that the user sends can arrive head end on the data channel of passback.Because the requirement of digital modulation and transmission performance is higher than analog signal, especially upstream direction, but the arborizations structure of hfc plant, the interference noise that returns each fulcrum will be aggregated to the HFC front end gradually, cause the signal to noise ratio of front end to be difficult to guarantee, to making network operation instability, even can not work, thereby it is most important to reduce return noise for two-way hfc plant.
Generally transformation comprises optical node is carried out bidirectional rebuilding to hfc plant, installs the backlight transmitter module additional, lays oppositely passback optical fiber; And all coaxial cable electric signal amplifiers are carried out bidirectional rebuilding, in amplifier, install reverse amplification module additional; In user family, increase a cable of cable TV delivery outlet, cable modem is installed in each user family.
When carrying out bidirectional rebuilding in this manner, can only reduce noise on the passback path by selecting high-quality equipment and material, two aspects of raising project quality.But the major part of system (＞50%) noise is invaded from user's bifurcations.This a part of noise can not reduce.On the other hand, the price of present ustomer premises access equipment-cable modem also very high (more than 2000 yuan) causes this kind The Application of Technology scope to be affected greatly.And because the equipment on all hfc plants all must possess the ability of transmission two-way signaling, this also makes the network overall cost rise.
For existing systems, have following two problems to need to solve:
(1) invades noise jamming
(2) reduce system reform cost
Purpose of the present invention is exactly to provide a kind of existing cable TV optical fiber/coaxial cable hybrid network and local anastomose of utilizing to close the method for carrying out broadband access in order to overcome the deficiencies in the prior art, adopt method of the present invention, can solve above-mentioned problems of the prior art well.
According to one aspect of the present invention, the invention provides a kind of existing cable TV optical fiber/coaxial cable hybrid network and local anastomose of utilizing and close the method for carrying out broadband access, this method comprises: add a branch distributor after the building head two-way amplifier in the cable tv coax distribution network, use a delivery outlet stube cable modulator-demodulator of this branch distributor, and after cable modem, add the Ethernet concentrating equipment, lay Ethernet from the Ethernet concentrating equipment to the user, on coaxial cable behind the building head two-way amplifier, install a high pass filter additional, thereby inverse noise is isolated.
According to another aspect of the present invention, the invention provides a kind of existing cable TV optical fiber/coaxial cable hybrid network and local anastomose of utilizing and close the method for carrying out broadband access, this method comprises: add a branch distributor before the unidirectional amplifier of building head in the cable tv coax distribution network, use the delivery outlet stube cable modulator-demodulator of this branch distributor, and after cable modem, add the Ethernet concentrating equipment, lay Ethernet from the Ethernet concentrating equipment to the user, reverse amplification mould is not installed, because unidirectional amplifier does not possess the reverse transfer ability, return noise can not pass through the unidirectional amplifier of building head.
Brief Description Of Drawings:
Fig. 1 is the systematic square frame and the signal flow graph of one embodiment of the present of invention, and this embodiment adds the splitter distributor after building head two-way amplifier.
Fig. 2 is the systematic square frame and the signal flow graph of an alternative embodiment of the invention, and this embodiment added the splitter distributor before the unidirectional amplifier of building head.
Each number designation is represented respectively among the figure:
1 building head two-way amplifier 2 branch distributors
3 high pass filters, 4 Ethernet concentrating equipments
5 subscriber computers, 6 cable modems
The unidirectional amplifier of 7 building heads
The present invention is described in detail below in conjunction with accompanying drawing.
Utilize existing cable TV optical fiber/coaxial cable hybrid network and local anastomose to close and carry out in the broad band access method, most importantly will solve the interference problem of outside noise system.In cable TV optical fiber/coaxial cable hybrid network and the local area network (LAN), noise is mainly invaded whole network by coaxial cable user distribution network.The present inventor is through studying for a long period of time and a large amount of tests, invent a kind of existing cable TV optical fiber/coaxial cable hybrid network and local anastomose of utilizing and closed the method for carrying out broadband access, this method has solved problems of the prior art, and very economical.The cardinal principle of the inventive method is at the building head amplifier place noise of these intrusions to be stopped or filter out.
Fig. 1 is the systematic square frame and the signal flow graph of one embodiment of the present of invention.This is that the building head is the situation of two-way amplifier.As shown in Figure 1, this method comprises: add a branch distributor after the building head two-way amplifier in the cable tv coax distribution network, use a delivery outlet stube cable modulator-demodulator of this branch distributor, and after cable modem, add the Ethernet concentrating equipment, lay Ethernet from the Ethernet concentrating equipment to the user, be used for behind all building head two-way amplifiers transmitting on the cable of cable TV signal and install a high pass filter additional.
Specifically, according to method of the present invention, install a splitter distributor 2 additional after the building head two-way amplifier 1 on coax network, tell one road signal for separately cable modem 6, behind another signal output of splitter distributor 2, add a high pass filter 3.The cable TV signal of forward and downlink data signal enter building head two-way amplifier by coaxial cable, and the forward amplification module of building head two-way amplifier comprises after the data-signal processing and amplifying forward signal by outputing to splitter distributor 2.Splitter distributor 2 is divided into two-way with forward signal, and one tunnel output sends high pass filter 3 to, outputs to cable tv coax user distribution network through the signal of high pass filter; Another road forward signal is given cable modem 6, cable modem 6 converts downlink data signal to the Ethernet data signal, and other ports of giving Ethernet concentrating equipment 4 Ethernet concentrating equipments 4 by twisted-pair feeder are used for linking user's computer 5.Blocked by high pass filter 3 and can't continue to upload from the reverse return noise of user's cable tv coax distribution network invasive system.High pass filter can transmitting high-frequency signal, and TV signal all is a high-frequency signal, so this structure can not influence the normal transmission of cable TV signal.The reverse data signal of being launched by cable modem 6 enters splitter distributor 2 by cable, because 2 pairs of reverse signals of splitter distributor are without hindrance every function, so reverse data-signal can transmit unblockedly, by the input port of splitter distributor upwards transmission enter two-way amplifier 1.The reverse data signal is amplified the input port upwards transmission of back by two-way amplifier by the reverse amplification module of two-way amplifier 1.Like this, invade most of being completely cut off below building head amplifier of noise in the cable television distribution network, so just significantly reduced the intrusion noise on the passback path.Secondly, utilize the ethernet technology and the cable data transmission technology of existing maturation to combine, on the output port of cable modem, connect an Ethernet concentrating equipment 4, such as Ethernet switch or hub, will be connected more than one computer equipment again and share this cable modem on this equipment.So just can make 5-10 user share a cable modem.Because the wiring of Ethernet and equipment are all very ripe, cheap, cost approximately is 1/5th to 1/10th of a cable modem.So both avoided using expensive optical fiber to lay the basic routing line garden in, and avoided the too much cable modem that uses costliness again, whole cost also just descended many.
Fig. 2 is the systematic square frame and the signal flow graph of an alternative embodiment of the invention.This be the building head be unidirectional amplifier situation as shown in Figure 2, the invention provides a kind of existing cable TV optical fiber/coaxial cable hybrid network and local anastomose of utilizing and close the method for carrying out broadband access, this method comprises: add a branch distributor before the unidirectional amplifier of building head in the cable tv coax distribution network, use a delivery outlet stube cable modulator-demodulator of this branch distributor, and after cable modem, add the Ethernet concentrating equipment, lay Ethernet to the user from the Ethernet concentrating equipment.
Specifically,, before the unidirectional amplifier 7 of the building head on the coax network, install a splitter distributor 2 additional, tell one road signal for separately cable modem 6 according to method of the present invention.The cable TV signal of forward and downlink data signal enter splitter distributor 2 by coaxial cable, splitter distributor 2 is divided into two-way with signal, one the tunnel sends the unidirectional amplifier 7 of building head to, transmits to cable tv coax user distribution network after head unidirectional amplifier 7 in building amplifies; Another road signal outputs to cable modem 6.Cable modem 6 converts downlink data signal to the Ethernet data signal, and the Ethernet data signal enters Ethernet concentrating equipment 4 by twisted-pair feeder, and other ports of Ethernet concentrating equipment 4 are used for linking user's computer 5.Because unidirectional amplifier 7 is unidirectional, can not pass through unidirectional amplifier 7 from the reverse return noise of user's cable tv coax distribution network invasive system, more can not continue to upload.And enter splitter distributor 2 by the reverse data signal that cable modem 6 is launched, because 2 pairs of reverse signals of splitter distributor are without hindrance every function, so reverse data-signal can transmit unblockedly.Like this, the noise great majority of invading in the cable television distribution network are just completely cut off below building head amplifier, have so just significantly reduced the intrusion noise on the passback path.Secondly, utilize the ethernet technology and the cable data transmission technology of existing maturation to combine, on the output port of cable modem, connect an Ethernet concentrating equipment 4, such as Ethernet switch or hub, will be connected more than one computer equipment again and share this cable modem on this equipment.So just can make 5-10 user share a cable modem.
This inventive method has obvious advantage compared with prior art. At first, press According to the inventive method, can reduce in a large number and invade from the user assignment coax network Noise, and promoted significantly the quality of whole network when transmission of data signals. Secondly, Use Ethernet as the secondary distribution net, decrease whole investment.
Claims (2)
1, a kind of existing cable TV HFC net and local anastomose of utilizing closes the method for carrying out broadband access, it is characterized in that: add a branch distributor after the building head two-way amplifier in the cable tv coax distribution network; Use a delivery outlet stube cable modulator-demodulator of this branch distributor, and after cable modem, add the Ethernet concentrating equipment, lay Ethernet to the user from the Ethernet concentrating equipment; Behind branch distributor, install a high pass filter additional.
2, a kind of existing cable TV HFC net and local anastomose of utilizing closes the method for carrying out broadband access, it is characterized in that: add a branch distributor before the unidirectional amplifier of building head in the cable tv coax distribution network, use a delivery outlet stube cable modulator-demodulator of this branch distributor, and after cable modem, add the Ethernet concentrating equipment, lay Ethernet to the user from the Ethernet concentrating equipment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011294590A CN1140089C (en) | 2000-12-22 | 2001-06-21 | Wideband access method by using combination of HFC and local area network |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN00135838.3 | 2000-12-22 | ||
| CN 00135838 CN1296350A (en) | 2000-12-22 | 2000-12-22 | Wide band connection by combination of HFC and local network |
| CNB011294590A CN1140089C (en) | 2000-12-22 | 2001-06-21 | Wideband access method by using combination of HFC and local area network |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1329424A CN1329424A (en) | 2002-01-02 |
| CN1140089C true CN1140089C (en) | 2004-02-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB011294590A Expired - Fee Related CN1140089C (en) | 2000-12-22 | 2001-06-21 | Wideband access method by using combination of HFC and local area network |
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| Country | Link |
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| CN (1) | CN1140089C (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101098165B (en) * | 2006-06-27 | 2010-12-22 | 上海未来宽带技术及应用工程研究中心有限公司 | Method for providing high speed broadband service on coaxial cable |
| US8849221B2 (en) * | 2012-11-16 | 2014-09-30 | Mstar Semiconductor, Inc. | Direct conversion transmitter and communication system utilizing the same |
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2001
- 2001-06-21 CN CNB011294590A patent/CN1140089C/en not_active Expired - Fee Related
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| Publication number | Publication date |
|---|---|
| CN1329424A (en) | 2002-01-02 |
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