CN1668037A - IP network and cable television network merged access method and equipment - Google Patents
IP network and cable television network merged access method and equipment Download PDFInfo
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- CN1668037A CN1668037A CNA2004100168297A CN200410016829A CN1668037A CN 1668037 A CN1668037 A CN 1668037A CN A2004100168297 A CNA2004100168297 A CN A2004100168297A CN 200410016829 A CN200410016829 A CN 200410016829A CN 1668037 A CN1668037 A CN 1668037A
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Abstract
This invention disclose an access method for combing IP network and wire TV network including a protocol stack comprising a physical layer, a data link layer, a network layer, a transmission layer and an applied layer to realize forward of IP/DVB multicast data from wire TV network to LAN and help the LAN users to receive the IP/DVB multicast data transferred by the wire TV network and access external IP network and interact with far distance servers to form an interaction loop. A device is disclosed containing a multicast route forward process module and a network address conversion process module and three interfaces, one is connected with the wire TV network receiving downstream IP/DVB multicast data, the other interface is connected with the external IP network and the third one is connected with the internal LAN.
Description
Technical field
The present invention relates to a kind of cut-in method and equipment of computer network, especially relate to a kind of equipment that has merged the route cut-in method of IP network and cable TV network and realized this method.
Background technology
Present pure IP network is for the support inadequate natural endowment of multicast, and multicast has natural advantage for big capacity multi-medium data transmission.Cable television network is born radio network, is relatively easy by cable TV network for the user provides the multicast service, and from the angle in broadband, cable TV network also can satisfy the demand of multimedia service.Adopt IP Over DVB technology, can allow IP transmit, therefore can take the scheme of transmission of large capacity multi-medium data on cable television network by cable TV network.But domestic cable TV network does not support to return circuit, if therefore adopt pure cable TV network to carry out wideband transmit, then relates to the bidirectional rebuilding engineering of cable TV.With regard to the present situation of present cable TV network, only just quite high from its cost of bidirectional rebuilding.
Make up satisfactory communications platform, should be based on existing network condition, strive for spending lower cost and come one of framework, new network that simultaneously can be mutual based on multicast.
Summary of the invention
In order to allow LAN subscriber receive the multi-case data of the IP/DVB that transmits by cable TV network, make the LAN subscriber can be mutual simultaneously with the ground far away server group that this business service is provided, the invention provides a kind of cut-in method that merges IP network and cable TV network, this method realizes the forwarding of multi-case data from the cable TV network to the local area network (LAN) of IP/DVB, simultaneously also local area network (LAN) can be inserted the external IP network, realize interaction loop, thereby can better merge cable TV network and IP network.This method is practical, and the cost of cost is very little.
The present invention also provides a kind of access device of implementing above-mentioned cut-in method.
A kind of cut-in method that merges IP network and cable TV network comprises a protocol stack, and described protocol stack is made up of physical layer, data link layer, network layer, transport layer, application layer,
The physical layer of described protocol stack comprises RF interface that is connected with the line TV network and the general network interface that is connected Ethernet;
Described data link layer has comprised from the data flow of the multi-protocols of cable TV network encapsulation and from the ethernet frame of Ethernet;
Described network layer is reduced into the IP bag for the packet from the encapsulation of the multi-protocols of cable television network, also is reduced into the IP bag with packet from Ethernet;
Described transport layer is a TCP/UDP bag, encapsulates from the The data UDP of cable television network, from the The data TCP/UDP encapsulation of Ethernet;
Described application layer has comprised multimedia data stream and common application data stream.
A kind of access device of realizing merging the cut-in method of IP network and cable TV network comprises multicast routing forwarding processing module and network address translation processing module and at least three interfaces: RF interface, external IP network interface, inner Ethernet interface are formed;
Described multicast routing forwarding processing module is handled the data by the input of RF interface, the data that receive from cable television network, be reduced into the IP packet, multicast packets is carried out the multicast route, carry out the IGMP data decryptor by the igmp snooping module, if this local area network (LAN) has the user to add this multicast address, then be forwarded to internal lan by Ethernet interface, otherwise packet discard;
Described network address translation processing module is handled by the data from external IP network interface and the input of inner Ethernet interface, adopt NAT technology to handle the IP packet that receives, if from the data of external IP network interface, after then carrying out network address translation, be forwarded to internal lan by inner Ethernet interface; From the data of the internal lan of inner Ethernet interface, select network communication interface voluntarily according to actual conditions, if destination address is the external IP network address, then after carrying out address transition, transmit by the external IP network interface.
Cut-in method of the present invention and equipment are connected with cable television network on the one hand, receive the multi-case data of descending IP/DVB, can pass through Leased line on the other hand, dial line or ADSL and the external IP network interconnection, particularly interconnected with Internet, thus set up and the two-way channel end to end between the information distribution center of server group far away.This method realizes the multi-case data forwarding of IP/DVB, help LAN subscriber can receive the multi-case data of the IP/DVB that transmits by cable TV network, also help simultaneously LAN subscriber to insert Internet, can carry out alternately the realization interaction loop with server far away.
Beneficial effect of the present invention mainly shows as:
1. access way of the present invention has merged the access of cable TV network and traditional IP.Cable TV network is by IP over DVB technology, transmit the multi-case data that meets the IP network standard, then this equipment receiving data and with this data forwarding to the internal lan user, avoided each internal lan user must could receive the restriction of IP/DVB data by the DVB data receiver card.
2. the equipment of this access way can make up one based on multi-case data by the lower economic cost of cost, and new network that simultaneously can be mutual has avoided cable television network to carry out bidirectional rebuilding and the high cost that produces, has practical economic benefit.
This method is applicable to that LAN subscriber receives multi-case data, solves the mutual circuit question of up passback for LAN subscriber simultaneously.
Description of drawings
Fig. 1 is the network topology structure figure that cut-in method of the present invention is implemented;
Fig. 2 is the network protocol stack structure principle chart of cut-in method of the present invention;
Fig. 3 is the structural principle schematic diagram of access device of the present invention.
Embodiment
The network topology structure figure that cut-in method of the present invention is implemented as shown in Figure 1.Be provided with access device (3) in the described internal lan (6), this local area network (LAN) (4) is supported multicast transmission.The RF interface of access device (3) links to each other with cable television network (CATV) (2), and its external IP network interface links to each other with external IP network (as Internet) (7).By access device (3), internal lan user (5) can receive the far data of server group (1) transmission, and server group (1) realization is mutual simultaneously with far.
The present invention passes through method as shown in Figure 2, and the protocol stack of DVB data and IP data has been merged in employing one.The structure of protocol stack is:
1. physical layer: for data communication provides interconnect equipment, physical layer has comprised the RF interface and the general network interface that is connected Ethernet that connects cable TV network;
2. data link layer: comprised from the data flow of the multi-protocols encapsulation (MPE) of cable TV network and from the ethernet frame of Ethernet;
3. network layer: identical with the network layer content of traditional ICP/IP protocol stack, be reduced into the IP bag from the packet of the multi-protocols encapsulation (MPE) of cable television network, also be reduced into the IP bag with packet from Ethernet;
4. transport layer: identical with the transport layer content of traditional ICP/IP protocol stack, this layer is the TCP/UDP bag, from the The data of cable television network be that UDP encapsulates, all adopt from the data TCP/UDP of Ethernet.
5. application layer: identical with the application layer content of traditional ICP/IP protocol stack, be multimedia data stream, various ways such as file.
As shown in Figure 3, realize having in the access device of the present invention (3) multicast routing forwarding processing module and network address translation (nat) processing module and at least three interfaces: RF interface 1, external IP network interface 2, inner Ethernet interface 3; RF interface 1 is connected to the line TV network, and external IP network interface 2 connects external IP network (as Internet), and inner Ethernet interface 3 connects local area network (LAN).
What RF interface 1 connect is the TS packet that cable TV network transmits, and the IP that encapsulates by multi-protocols that reduces then wraps, and this moment, data entered described network protocol stack.After being reduced into the IP bag from the TS data packet analysis of RF interface 1, the multicast Routing Forward Module will carry out route analysis to this IP bag, determine whether this IP bag to be forwarded to the local area network (LAN) that inner Ethernet interface 3 links to each other.LAN subscriber receives the multicast packets that sends through cable TV network by inner Ethernet interface 3.
Enter the IP packet of external IP network interface 2 and inner Ethernet interface 3, will handle (NAT) module by network address translation and carry out, determine whether to carry out network address translation and transmit packet with broadcasting processing.If from external IP network interface 2, then after address transition, carry out local area network (LAN) by inner Ethernet interface 3 and transmit.For the data that are local area network (LAN) inside from inner Ethernet interface 3, select network communication interface voluntarily according to actual conditions.If destination address is the external IP network address, then after address transition, transmit by external IP network interface 2.Otherwise, this packet is not transmitted.
Described multicast route is observed distance vector multicast routing protocol DVMRP.
Claims (2)
1. a cut-in method that merges IP network and cable TV network comprises a protocol stack, and described protocol stack is made up of physical layer, data link layer, network layer, transport layer, application layer,
Described physical layer comprises RF interface that is connected with the line TV network and the general network interface that is connected Ethernet;
Described data link layer has comprised from the data flow of the multi-protocols of cable TV network encapsulation and from the ethernet frame of Ethernet;
Described network layer is reduced into the IP bag for the packet from the encapsulation of the multi-protocols of cable television network, also is reduced into the IP bag with packet from Ethernet;
Described transport layer is a TCP/UDP bag, encapsulates from the The data UDP of cable television network, from the The data TCP/UDP encapsulation of Ethernet;
Described application layer has comprised multimedia data stream and common application data stream.
2. an access device of realizing merging the cut-in method of IP network and cable TV network comprises multicast routing forwarding processing module and network address translation processing module and at least three interfaces: RF interface, external IP network interface, inner Ethernet interface;
Described multicast routing forwarding processing module is handled the data by the input of RF interface, the data that receive from cable television network, be reduced into the IP packet, multicast packets is carried out the multicast route, carry out the IGMP data decryptor by the igmp snooping module, if this local area network (LAN) has the user to add this multicast address, then be forwarded to internal lan by inner Ethernet interface, otherwise packet discard;
Described network address conversion module is handled by the data from external IP network interface and the input of inner Ethernet interface, adopt NAT technology to handle the IP packet that receives, if from the data of external IP network interface, after then carrying out network address translation, be forwarded to internal lan by inner Ethernet interface; From the data of the internal lan of inner Ethernet interface, select network communication interface voluntarily according to actual conditions, if destination address is the external IP network address, then after carrying out address transition, transmit by the external IP network interface.
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| Application Number | Priority Date | Filing Date | Title |
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| CNA2004100168297A CN1668037A (en) | 2004-03-10 | 2004-03-10 | IP network and cable television network merged access method and equipment |
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| CNA2004100168297A CN1668037A (en) | 2004-03-10 | 2004-03-10 | IP network and cable television network merged access method and equipment |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008009208A1 (en) * | 2006-07-11 | 2008-01-24 | Hangzhou H3C Technologies Co., Ltd. | ETHERNET RECEIVING AND TRANSMITTING DEVICE BASED ON THE TV coaxial line |
| WO2008089652A1 (en) * | 2007-01-19 | 2008-07-31 | Huawei Technologies Co., Ltd. | A method, a device and a system for converging ip message |
| CN100553229C (en) * | 2007-01-24 | 2009-10-21 | 中国科学院计算机网络信息中心 | A kind of dynamic multicast routing method of half-covered self-organizing |
| CN101400022B (en) * | 2007-09-26 | 2010-05-26 | 华为技术有限公司 | Method, apparatus and system for identifying service type and establishing service according to identification |
| CN101068351B (en) * | 2007-05-25 | 2010-06-16 | 中兴通讯股份有限公司 | Mobile terminal digital television data transmitting method |
| CN101166322B (en) * | 2006-10-19 | 2010-10-27 | 华为技术有限公司 | A dual mode mobile receiving device and its receiving method |
| CN101141375B (en) * | 2006-09-05 | 2010-12-22 | 华为技术有限公司 | Packet transmission method, transmission apparatus and system within LAN |
| CN102006503A (en) * | 2010-11-05 | 2011-04-06 | 中国科学院声学研究所 | Wideband data communication system and method for integrating IP network and cable television network |
| CN101669105B (en) * | 2007-04-26 | 2012-08-29 | 思科技术公司 | Multicast fast reroute |
| CN102684968A (en) * | 2011-03-07 | 2012-09-19 | 中国科学院声学研究所 | System and method for fusing cable television network and IP (internet protocol) network to transmit IP data |
| CN105007635A (en) * | 2015-06-29 | 2015-10-28 | 众研凯博网络科技有限公司 | Communication method and communication system |
| TWI595756B (en) * | 2013-12-06 | 2017-08-11 | 廣播科技機構公司 | Ofdm based broadcast communication system |
| CN110098899A (en) * | 2018-01-31 | 2019-08-06 | 国广融合（北京）传媒科技发展有限公司 | A method of protocol stack, data based on fusion Transmission system retransmit |
-
2004
- 2004-03-10 CN CNA2004100168297A patent/CN1668037A/en active Pending
Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008009208A1 (en) * | 2006-07-11 | 2008-01-24 | Hangzhou H3C Technologies Co., Ltd. | ETHERNET RECEIVING AND TRANSMITTING DEVICE BASED ON THE TV coaxial line |
| CN101141375B (en) * | 2006-09-05 | 2010-12-22 | 华为技术有限公司 | Packet transmission method, transmission apparatus and system within LAN |
| CN101166322B (en) * | 2006-10-19 | 2010-10-27 | 华为技术有限公司 | A dual mode mobile receiving device and its receiving method |
| WO2008089652A1 (en) * | 2007-01-19 | 2008-07-31 | Huawei Technologies Co., Ltd. | A method, a device and a system for converging ip message |
| CN100553229C (en) * | 2007-01-24 | 2009-10-21 | 中国科学院计算机网络信息中心 | A kind of dynamic multicast routing method of half-covered self-organizing |
| CN101669105B (en) * | 2007-04-26 | 2012-08-29 | 思科技术公司 | Multicast fast reroute |
| CN101068351B (en) * | 2007-05-25 | 2010-06-16 | 中兴通讯股份有限公司 | Mobile terminal digital television data transmitting method |
| CN101400022B (en) * | 2007-09-26 | 2010-05-26 | 华为技术有限公司 | Method, apparatus and system for identifying service type and establishing service according to identification |
| CN102006503A (en) * | 2010-11-05 | 2011-04-06 | 中国科学院声学研究所 | Wideband data communication system and method for integrating IP network and cable television network |
| CN102006503B (en) * | 2010-11-05 | 2013-04-24 | 中国科学院声学研究所 | Wideband data communication system and method for integrating IP network and cable television network |
| CN102684968A (en) * | 2011-03-07 | 2012-09-19 | 中国科学院声学研究所 | System and method for fusing cable television network and IP (internet protocol) network to transmit IP data |
| CN102684968B (en) * | 2011-03-07 | 2014-08-06 | 中国科学院声学研究所 | System and method for fusing cable television network and IP (internet protocol) network to transmit IP data |
| TWI595756B (en) * | 2013-12-06 | 2017-08-11 | 廣播科技機構公司 | Ofdm based broadcast communication system |
| CN105007635A (en) * | 2015-06-29 | 2015-10-28 | 众研凯博网络科技有限公司 | Communication method and communication system |
| CN110098899A (en) * | 2018-01-31 | 2019-08-06 | 国广融合（北京）传媒科技发展有限公司 | A method of protocol stack, data based on fusion Transmission system retransmit |
| CN110098899B (en) * | 2018-01-31 | 2021-11-09 | 国广融合（北京）传媒科技发展有限公司 | Protocol stack based on converged transmission system and data retransmission method |
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