CN1129269C - Integrated service network based on HFC - Google Patents

Integrated service network based on HFC Download PDF

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Publication number
CN1129269C
CN1129269C CN97108892A CN97108892A CN1129269C CN 1129269 C CN1129269 C CN 1129269C CN 97108892 A CN97108892 A CN 97108892A CN 97108892 A CN97108892 A CN 97108892A CN 1129269 C CN1129269 C CN 1129269C
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radio frequency
hfc
circuit
network
links
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CN1196624A (en
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王先群
江涛
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Abstract

The present invention relates to an HFC-based integrated service network which comprises an optical fiber/coaxial cable mixed network HFC, a local CATV distribution network, a digital office terminal machine, a network interface unit and a network management center. The present invention has the advantages of low cost, simple structure and flexible networking mode, realizes the integrated transmission of various comprehensive services including a telephone service, and solves the problem of funnel noise existing in HFC in certain programs.

Description

Integrated services network based on HFC
The present invention relates to a kind of integrated services network of realizing phone, data and the integrated transmission of video signal based on optical fiber/coaxial hybrid network (HFC).
It was known already to be with optical cable or coaxial cable that medium constitute the technology of multifunctional comprehensive service network, for example in the CN 95102280 disclosed patent applications by including the user node device of computer, network interface card, special-purpose radio-frequency modulator-demodulator, increased the bidirectional data communication function on the net at existing unidirectional CATV.But user's node can only provide service for unique user in this scheme, the expense costliness, and also each user inserts the CATV net with coaxial cable, and the funnel noise of introducing is big; And this scheme relates generally to data communication service, and telephone service is not provided; In addition, this scheme only is applicable to the CATV net that adopts tree, has limited it and has been extensive use of and flexibility.In addition, the applicant's application number is the scheme that also discloses a kind of optical access network in the patent application of CN96119109, though it utilizes optical line terminal OLT, optical network unit ONU networking neatly, and realized phone, data and visual unification of three nets, but digital signal and analog signal (CATV signal) need be divided or the mode of wavelength division multiplexing be transmitted on optical fiber with sky in this scheme; And in this scheme, the digital signal of each 2M is transmitted in optical access network after being multiplexed to the 68M signal by the particular frame structure, need corresponding 2M signal on/Xia Lu and multiple/minute connection circuit.
Purpose of the present invention just is to overcome the above-mentioned shortcoming of prior art, utilize spectrum division (the descending 50-750Mhz of HFC, up 5-42Mhz, or other partitioning scheme), provide a kind of cost low based on HFC, structure is simple relatively, can be applicable to the diverse network structure flexibly, has realized comprising the integrated services network of the integrated transmission of multiple integrated service of phone.
HFC integrated services network of the present invention mainly comprises: optical fiber/coaxial hybrid network HFC, the digital HDT of central office terminal, network interface unit NIU, link to each other with described HDT and to described HDT with each described network interface unit NIU is configured and the NMS of network management center of condition monitoring and the local CATV distribution network that directly inserts described HFC with coaxial cable.The described digital HDT of central office terminal realizes the access of integrated service, and links to each other with described HFC with coaxial cable; The described network interface unit NIU that links to each other with described HFC with coaxial cable is the distributing point of integrated service, and realizes the access of the up phone/data-signal of each user terminal.
Described HDT comprises a plurality of radio frequency interface unit HRIU of digital central office terminal, webmaster radio frequency interface unit MRIU, radio frequency mixing/separator RFD/S.Described HRIU one end links to each other with switch, and the other end links to each other with the described radio frequency mixing/separator that inserts described HFC with coaxial cable; Described webmaster radio frequency interface unit MRIU provides the interface that is connected with network management center for each described radio frequency interface unit HRIU of digital central office terminal, and link to each other with described radio frequency mixing/separator, be sent to the webmaster signal of each described NIU and receive state information by described HFC from each described network interface unit NIU; CATV front end/sub-headend directly links to each other with described radio frequency mixing/separator, described radio frequency mixing/separator will be delivered to described HFC after will mixing from the signal of each the described radio frequency interface unit HRIU of digital central office terminal, described webmaster radio frequency interface unit MRIU and videoblankingsync, and will deliver to each the described digital radio frequency interface unit HRIU of central office terminal and described webmaster radio frequency interface unit MRIU from the upward signal branch of described HFC.
Described network interface unit NIU comprises network radio frequency interface unit NRIU and user interface section SIU.Described network radio frequency interface unit NRIU one end links to each other with described HFC with coaxial cable, and the other end links to each other with described user interface section SIU; The described user interface section SIU other end links to each other with each user terminal with twisted-pair feeder or base band coaxial cable or with wireless mode, distributes the descending phone/data-signal from described HFC, and inserts the up phone/data-signal from each user terminal.
The described NMS of network management center links to each other with described webmaster radio frequency interface unit MRIU, adopts the mode of point-to-multipoint to each described digital radio frequency interface unit HRIU of central office terminal and by described webmaster radio frequency interface unit MRIU, described radio frequency mixing/separator and described HFC each described network interface unit NIU to be finished configuration and condition monitoring.
The coaxial distribution network in described this locality directly links to each other with described HFC, and videoblankingsync is distributed to each TV user.
Therefore, the present invention has realized the integrated transmission on optical fiber/coaxial hybrid network of phone, data and video signal; Utilize the HFC spectrum division, finish transmitted in both directions, effectively utilized frequency spectrum resource, and help later business expansion by the up-downgoing passage; Each way word signal is modulated on the different carrier frequency, transmits in HFC with analog form, receiving terminal only needs just can to receive the signal that is sent to this unit by tuning circuit, therefore realized more easily the E1 digital signal on/following road; In addition, network management capabilities of the present invention is strong, and goes for adopting the optical fiber/coaxial hybrid network of various topological structures.Among the present invention, the shared network interface unit of a plurality of users, thus greatly reduce average equipment cost and network operation, operation and administrative expenses, also increased reliability of system operation; And each user terminal carries out the transmission of phone/data service with twisted-pair feeder or base band coaxial cable and described network interface unit NIU, make the high-frequency noise (for up phone/data-signal) that comes from each user terminal limited by the transmission medium frequency characteristic, be difficult to be sent to described network interface unit, thereby suppressed the funnel noise effect effectively.
Now be described with reference to the accompanying drawings embodiments of the invention:
Fig. 1 is the composition block diagram of an embodiment that the present invention is based on the integrated services network of HFC;
Fig. 2 is the composition block diagram of digital central office terminal shown in Fig. 1;
Fig. 3 is the composition block diagram of the radio frequency interface unit of digital central office terminal shown in Fig. 2;
Fig. 4 is the composition block diagram of the radio frequency interface of webmaster shown in Fig. 2 unit;
Fig. 5 is the schematic diagram of network interface unit shown in the key diagram 1;
Fig. 6 is the composition block diagram of the interface unit of network radio frequency shown in Fig. 5.
Referring to Fig. 1, this illustrates the composition block diagram of an embodiment of integrated services network of the present invention.As shown in the figure, integrated services network of the present invention mainly comprises optical fiber/coaxial hybrid network HFC101, the digital HDT102 of central office terminal, network interface unit NIU103 and the NMS104 of network management center, local CATV distribution network 105.The HDT102 that links to each other with HFC101 with coaxial cable, and directly links to each other with CATV front end/sub-headend 107 with PSTN, ISDN or Internet, DDN, X.25 link to each other by switch 106, thus the comprehensive access of realization phone, data, video signal; HDT also provides a network management interface to link to each other with network management center 104.The NIU103 that inserts HFC with coaxial cable links to each other with each user terminal with the access of the upstream rf signal of the distribution of realization phone/data service and each user terminal with twisted-pair feeder or base band coaxial cable or with wireless mode.Local CATV distribution network 105 directly inserts HFC, realizes the transparent transmission of TV signal.
As shown in Figure 2, HDT mainly comprises: radio frequency mixing/separator RFD/S201, the radio frequency interface unit HRIU202 of digital central office terminal that a plurality of ends link to each other with switch 106, the other end links to each other with radio frequency mixing/separator 201, and the webmaster radio frequency interface unit MRIU203 that links to each other with network management center 104 with the RS-232 interface (not shown).Each HRIU202 will be modulated to the downlink channel of the cable TV that is distributed from the E1 signal of switch by configuration, send radio frequency mixing/separator 201 to, and selective reception is reduced to the E1 signal with it and gives switch from the upstream rf signal of radio frequency mixing/separator 201.MRIU203 provides network management interface for each HRIU, and links to each other with radio frequency mixing/separator 201, provides the webmaster signal by HFC for each NIU103.After the modulation from the signal of each HRIU and MRIU and directly after the mixing of radio frequency mixings/separator 201 radio frequencies, send to HFC from the videoblankingsync of CATV front end/sub-headend 107, radio frequency mixing/separator 201 also provides the upward signal from HFC after separating for each HRIU and MRIU.Need illustrate, interconnection and multiple connection/drop set (not shown) that an E1 signal can also be arranged in switch 106 and 202 of described base band coaxial cable radio frequency interface unit, will from switch E1 signal cross also/or be multiplexed into each HRIU, and will from the signal tap of each HRIU also/or intersect after give switch.
Referring to Fig. 3, the HRIU202 shown in Fig. 2 comprises interface circuit 301A, 301B as can be known, FEC coding and modulation circuit 302, and low pass filtered involves frequency changer circuit circuit 303, tuning circuit 304, demodulation and fec decoder circuit 305, RS-232 interface 306 and CPU307.CPU307 coordinates configuration and monitoring to each several part, and is connected with described network management center 104 by RS-232 interface 306.Interface circuit 301A inserts the E1 signal from switch, gives radio frequency mixing/separator 201 through FEC coding and modulation circuit 302, low pass filtered after involving frequency changer circuit 303; Tuning circuit 304 selective receptions are from the upstream rf signal of radio frequency mixing/separator 201, and behind demodulation and fec decoder circuit 305,301B gives switch from interface circuit.Need illustrate that as added the interconnection and the multiple connection/drop set of E1 signal between switch and HRIU, then interface circuit 301A, 301B will do corresponding change with to import/go out signal code speed suitable.
Fig. 4 illustrates the MRIU203 shown in Fig. 2 and comprises: RS-232 interface 401, and RS-232 interface array 402, FEC coding and modulation circuit 403, low pass filtered involves frequency changer circuit 404, tuning circuit 405, demodulation and fec decoder circuit 406, and CPU407.CPU407 coordinates, disposes and monitor each several part, and communicate by letter with the NMS104 of network management center by RS-232 interface 401, accept the configuration and the monitoring of network management center, reception need be delivered to the webmaster signal of each NIU and the state information from each NIU that will receive is passed to network management center.RS-232 interface array 402 provides the interface of communicating by letter with network management center for each HRIU202.The configuration of each NIU and pilot signal involved through FEC coding and modulation circuit 403, low pass filtered frequency changer circuit 404 is laggard goes into radio frequency mixing/separator 201, be transferred to all NIU by HFC; Through tuning circuit 405, demodulation and fec decoder circuit 406 backs are sent to network management center 104 by CPU407 by RS-232 interface 401 from the state information of NIU.
Referring to Fig. 5, this illustrates the structural representation of the NIU103 shown in Fig. 1.Described as seen from Figure 5 NIU mainly comprises network radio frequency interface unit NRIU501 and user interface section SIU502.NRIU501 selective reception and demodulation are given SIU502 from phone/data downstream signal of described HFC with the phone/data-signal after the demodulation, by SIU with information distribution to each user terminal; After the SIU line concentration is handled, send to HFC from the up phone/data-signal of each user terminal by the NRIU modulation; 503 of SIU502 and each user terminals link to each other with twisted-pair feeder or base band coaxial cable.NRIU501 also selective reception and beams back network management center with the state information of this NIU modulation back by HFC from the webmaster signal of HFC.As seen from Figure 5, local coaxial distribution network 105 directly inserts HFC101, realizes the transparent transmission of videoblankingsync.Need illustrate that NRIU also links to each other with local PC (not shown), accepts its monitoring and configuration.
Fig. 6 illustrates the NRIU501 shown in Fig. 5 and mainly comprises: CPU601, radio frequency mixing/separator RFD/S602, RS-232 interface 608, and digital service communications portion and network management communication part.The digital service communications portion comprises interface circuit 603A, 603B, FEC coding and modulation circuit 604A, and demodulation and fec decoder circuit 605A, low pass filtered involves frequency changer circuit 606A and tuning circuit 607A; Network management communication partly comprises FEC coding and modulation circuit 604B, demodulation and fec decoder circuit 605B, and low pass filtered involves frequency changer circuit 606B and tuning circuit 607B.For up phone/data-signal, insert by interface circuit 603A, be sent to HFC through FEC coding and modulation circuit 604A, low pass filtered after involving frequency changer circuit 606A, the mixing of radio frequency mixings/separator 602 radio frequencies; After radio frequency separates, deliver to the phone/data-signal of this NIU501 by tuning circuit 607A selective reception from the downstream signal of HFC101, be in harmonious proportion fec decoder circuit 605A through separating, 603B delivers to SIU502 by interface circuit.For the webmaster signal, the webmaster signal of this NIU is delivered in tuning circuit 607B selective reception, gives described CPU601 behind demodulation and fec decoder circuit 605B, and configuration and the querying command finished this NIU transmit; The state information of described NIU is delivered to FEC coding and modulation circuit 604B by CPU601, involves frequency changer circuit 606B through low pass filtered, and radio frequency mixing/separator 602 radio frequencies are sent to HFC101 after mixing.CPU601 also coordinates, disposes and monitor the each several part circuit, and communicates by letter with local PC by RS-232 interface 608, accepts its configuration.
More than though HFC integrated services network of the present invention has been described in conjunction with the embodiments, but obviously embodiments of the invention are not limited to this, for example, HRIU202 can adopt the circuit identical with the NRIU501 structure, but need add a frequency changer at HRIU202 and 201 of radio frequency mixing/separators.For phone/data-signal, HRIU is modulated to same frequency range (as using uplink band 5-42Mhz) with NRIU (be actually same circuit and be used for different local different titles) and sends, tuning reception is also at same frequency range (following line frequency section 50-750Mhz), frequency changer in HRIU202 and 201 increases of radio frequency mixing/separator, to be transformed to high-frequency signal (50-750M) through the low frequency signal (5-42M) after the HRIU modulation and send to HFC after radio frequency mixes, and the low frequency signal from HFC (5-42M) after radio frequency separated gives the receiving unit of HRIU after being transformed to high-frequency signal, thereby can realize the transmitted in both directions of phone/data-signal between HRIU and NRIU; For the webmaster signal, when this circuit is used among the NIU103 as NRIU, the network management communication part is constant, when this circuit is used among the HDT as HRIU, directly communicate by letter with described network management center by the RS-232 interface array (402) among the MRIU with RS-232 interface, the network management communication part (604B, 605B, 606B, 607B) shown in Fig. 6 is then idle.Therefore, protection scope of the present invention should be determined by the claims that comprise all apparent changes that those skilled in the art may make.

Claims (15)

1 one kinds of integrated services networks based on HFC, comprise: optical fiber/coaxial hybrid network HFC (101), directly insert described HFC (101) with coaxial cable, the local CATV distribution network (105) that distributes videoblankingsync, at least one links to each other with described HFC (101), realize the digital central office terminal (102) that integrated service inserts, a plurality ofly also link to each other with described HFC (101), between each user terminal, distribute phone/data service and realize the network interface unit (103) that the up phone of each user terminal/data service inserts, and link to each other with described digital central office terminal (102), described digital central office terminal (102) and each described network interface unit (103) are configured network management center (104) with condition monitoring.
2 HFC integrated services networks according to claim 1, it is characterized in that: described digital central office terminal (102) comprises the first radio frequency mixing/separator (201) that an end links to each other with described HFC (101), a plurality of ends link to each other with switch (106), digital central office terminal radio frequency interface unit (202) that finishes voice/data signal exchange between described switch (106) and the described digital central office terminal (102) that the other end links to each other with the described first radio frequency mixing/separator (201), and be that described digital central office terminal radio frequency interface unit (202) provides network management interface and passes through the described first radio frequency mixing/separator (201), described HFC (101) provides the webmaster radio frequency interface unit (203) of webmaster signal for each described network interface unit (103).
3 as HFC integrated services network as described in the claim 2, it is characterized in that: described digital central office terminal comprises that also one is connected and multiple connection/drop set with signal cross between described digital central office terminal radio frequency interface unit (202) at described switch (106), will from the signal cross of described switch (106) also/or be multiplexed into each described digital central office terminal radio frequency interface unit (202), and will from the signal tap of each described digital central office terminal radio frequency interface unit (202) also/or intersect after give described switch (106).
4 as HFC integrated services network as described in claim 2 or 3, it is characterized in that: described network management center (104) links to each other with described webmaster radio frequency interface unit (203), adopts the mode of point-to-multipoint that described digital central office terminal radio frequency interface unit (202) and each described network interface unit (103) are finished configuration and condition monitoring.
5 as HFC integrated services network as described in the claim 4, it is characterized in that: described network interface unit (103) comprise an end with coaxial cable link to each other with described HFC (101), demodulate reception delivers to the network radio frequency interface unit (501) of following/upward signal of described HFC from/modulation, link to each other with described network radio frequency interface unit (501) with an end, the other end link to each other with each user terminal with access from the up phone/data-signal of each user terminal also distribution from the user interface section (502) of descending phone/data-signal of described HFC.
6 as HFC integrated services network as described in the claim 5, it is characterized in that: described user interface section (502) links to each other with each user terminal with twisted-pair feeder or data cable or with wireless mode.
7 as HFC integrated services network as described in claim 5 or 6, it is characterized in that: described webmaster radio frequency interface unit (203) comprises to be coordinated each several part in this unit, dispose and monitor and accept a CPU (407) of the configuration and the monitoring of described network management center (104), for a described CPU provides first serial (401) with described network management center (104) communication interface, for each described digital central office terminal radio frequency interface unit (202) provides serial ports array (402) with described network management center (104) communication interface, and first the coding and modulation circuit (403), one end links to each other with described first coding and modulation circuit (403), the other end involves frequency changer circuit (404) with first low pass filtered that the described first radio frequency mixing/separator (201) links to each other, with first tuning circuit (405) that the described first radio frequency mixing/separator (201) links to each other, first demodulation that links to each other with described first tuning circuit (405) and decoding circuit (406).
8 as HFC integrated services network as described in the claim 7, it is characterized in that: described digital central office terminal radio frequency interface unit comprises the 2nd CPU (307) that each several part in this unit is coordinated to dispose and monitor, first interface circuit (301A) and second interface circuit (301B) of described digital central office terminal (102) with described switch (106) interface are provided, and second coding and the modulation circuit (302) that links to each other with described first interface circuit (301A), one end links to each other with described second coding and modulation circuit (302), the other end involves frequency changer circuit (303) with second low pass filtered that the described first radio frequency mixing/separator (201) links to each other, second tuning circuit (304) that links to each other with the described first radio frequency mixing/separator (201), one end links to each other with described second tuning circuit (304), second demodulation that the other end links to each other with described second interface circuit (301B) and decoding circuit (305) are for a described CPU provides second serial (306) with described network management center (104) communication interface.
9 as HFC integrated services network as described in the claim 8, it is characterized in that: described network radio frequency interface unit (501) comprising: the 3rd CPU (601) that each several part in this unit is coordinated to dispose and monitor, the second radio frequency mixing/separator (602), and digital service communications portion and network management communication part; Receiving unit comprises the 3rd tuning circuit (607A) that links to each other with the described second radio frequency mixing/separator (602) that links to each other successively in the described digital service communications portion, the 3rd demodulation and decoding circuit (605A), and the 4th interface circuit (603B) that links to each other with described user interface section (502), the sending part branch comprises the 3rd interface circuit (603A) that links to each other with described user interface section (502) that links to each other successively, the 3rd coding and modulation circuit (604A), and the 3rd low pass filtered that links to each other with the described second radio frequency mixing/separator (602) involves frequency changer circuit (606A); Receiving unit comprises the 4th tuning circuit (607B) that links to each other with the described second radio frequency mixing/separator (602) in the described network management communication part, link to each other with described the 4th tuning circuit (607B) and give the 4th demodulation and the decoding circuit (605B) of described the 3rd CPU (601) with the webmaster signal after the demodulation, the sending part branch comprises and the need from described the 3rd CPU (601) is reported the 4th coding of the information coding of described network management center (104) and modulation and modulation circuit (604B) and an end is encoded with the described the 4th and modulation circuit (604B) links to each other, the other end involves frequency changer circuit (606B) with the 4th low pass filtered that the described second radio frequency mixing/separator (602) links to each other.
10 as HFC integrated services network as described in the claim 9, it is characterized in that: described network interface unit (501) comprises that also one links to each other with described CPU (601), provides the 3rd serial ports (608) with local PC communication interface for described network interface unit (501).
11 as HFC integrated services network as described in the claim 4, it is characterized in that: the structure of described digital central office terminal radio frequency interface unit (202) is identical with described network radio frequency interface unit (501), and described digital central office terminal (102) also comprises a frequency changer that is positioned between described digital central office terminal radio frequency interface unit (202) and described radio frequency mixing/separator (201).
12 as HFC integrated services network as described in the claim 8,9,10 or 11, it is characterized in that: described signal cross connects and is connected and multiple connection/drop set for the E1 signal cross with multiple connection/drop set.
13 as HFC integrated services network as described in the claim 12, it is characterized in that: described first serial (401), described second serial (306), the 3rd serial ports (608) are RS-232 interface, and described serial ports array (402) is a RS-232 serial ports array.
14 as HFC integrated services network as described in the claim 13, it is characterized in that: described first coding and modulation circuit (403), described second coding and modulation circuit (302), described the 3rd coding and modulation circuit (604A), described the 4th coding and modulation circuit (604B) are FEC coding and modulation circuit, and described first demodulation and decoding circuit (406), described second demodulation and decoding circuit (305), described the 3rd demodulation and decoding circuit (605A), described the 4th demodulation and decoding circuit (605B) are demodulation and fec decoder circuit.
15 as HFC integrated services network as described in the claim 14, and its feature also is: described first interface circuit (301A), described second interface circuit (301B), described the 3rd interface circuit (603A), described the 4th interface circuit (603B) are the E1 interface circuits.
CN97108892A 1997-04-17 1997-04-17 Integrated service network based on HFC Expired - Lifetime CN1129269C (en)

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CN100397891C (en) * 2003-10-29 2008-06-25 成都润网科技有限公司 Method for solving convergence interference using multi-nierarchy structure
CN1615013A (en) * 2003-11-05 2005-05-11 华为技术有限公司 System for realizing wideband inserting in wireless Tv-set network
CN101478504B (en) * 2008-12-04 2011-05-04 上海大学 Multimedia house gateway and method for implementing conversion between signals of optical cable and coaxial electric cable
CN103607548B (en) * 2013-11-13 2017-08-04 四川福润得数码科技有限责任公司 A kind of AV modulation output tuning receives integrated module

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