CN1697516A - Method in use for determining topological structure of cable TV HFC network - Google Patents
Method in use for determining topological structure of cable TV HFC network Download PDFInfo
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- CN1697516A CN1697516A CN 200510020696 CN200510020696A CN1697516A CN 1697516 A CN1697516 A CN 1697516A CN 200510020696 CN200510020696 CN 200510020696 CN 200510020696 A CN200510020696 A CN 200510020696A CN 1697516 A CN1697516 A CN 1697516A
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Abstract
The method raises accuracy of HFC network topology greatly, and generates HFC network topological graph rapidly and automatically. Each HFC network device possesses a specific address. Network management computer at front end generates topological data through following steps: computer at front end sends command of generating data to specific device; receiving the command, the specified device sends local topological data to down going transmission channels according to broadcasting mode, and meanwhile sending the data to up going channel; all devices in lower level store address data of device in upper level into local network table; the said computer at front end takes back all network topological table of HFC network devices one by one according to unicast mode; through simple process, the computer at front end forms whole HFC network topology of cable TV.
Description
Technical field
The present invention relates in cable tv coax fiber mix net network the network management of english abbreviation HFC, the method that the topology data of the physical link with branch type and star-like mixing connection network of cable TV fiber mix net generates.
Background technology
Because hfc plant is in the correlation that relates to equipment on the hfc plant aspect the network management, promptly topological, press traditional method, by manually pressing the typing of network planning design drawing, be easy to cause wrong record, leak record, the network topology of hfc plant management system is not conformed to real network, cause the incorrect and system failure misdirection of The results of running.The prior art approaching with it is Chinese patent publication number CN1330821A, and the patent of invention name is called the method that is used for determining computer network topologies, can only be applicable to the topological structure of computer network management.Chinese patent publication number CN1449158A, a kind of network topology information acquisition method of denomination of invention can only be applicable to the topological structure of computer network management.Determine method about the topological structure in the network management of cable TV fiber mix net, the domestic report that yet there are no.
Summary of the invention
In order to overcome conventional art by manually by the typing of network planning design drawing, be easy to cause wrong record, leak record, the network topology of hfc plant management system is not conformed to real network, cause the incorrect and system failure misdirection of The results of running, the objective of the invention is to, a kind of method that is used for determining topological structure of cable TV HFC network is provided.
The present invention is in the applicant's patent of invention number 031177360, denomination of invention: based on the basis of the cable tv network system management system of geography information, utilize this management system and determine topological structure of cable TV HFC network.
A kind of method that is used for determining topological structure of cable TV HFC network, this method add the generation that the data answering device just can be finished topological structure based on transmitted in both directions cable TV HFC network in traditional cable television appliances, this transponder has following characteristics:
A, has a descending receive path
B, has a descending sendaisle
C, has a up sendaisle
More than two sendaisles open/close the control that is subjected to data command;
This method comprises: see Fig. 3 and Fig. 4,
First step: topological data generates, by the front-end network management computer designated equipment is sent data and generate instruction, designated equipment sends the mode of this machine topological data by broadcasting after receiving this instruction at descending sendaisle, send this data at data feedback channel simultaneously;
Second step: when the front-end network management computer was received above-mentioned topological data, expression generated the instruction executed by the previous data that send of front-end network management computer and finishes;
Third step: all every energy of equipment are received the equipment of above-mentioned topological data on the hfc plant, all these data are added in the network topology table of this machine;
The 4th step: generate instruction by sending data to next equipment then, repeat above-mentioned first step, make to add on the net list of each equipment and go up new device data to third step by the front-end network management computer;
The 5th step: send data by the front-end network management computer and generate instruction, continue to carry out above-mentioned first step respectively one by one to third step, make to add on the net list of each equipment and go up new device data by all the other equipment; Finish the generation of topological data up to whole hfc plant equipment;
The 6th step: the front-end network management computer is regained the network topology table of whole hfc plant equipment one by one by mode of unicast, carry out simple process by computer then and form whole topological structure of cable TV HFC network, finish the automatic generation of network topology structure.
The present invention also can be used for the physical link accuracy verification of hfc plant, because hfc plant might be because workmen's mistake causes the link of real network not conform to design drawing in work progress, can verify its construction results by this method, thereby the time of artificial Network Search fault has been saved in pinpointing the problems, dealing with problems early.
The problem that this method need solve is as follows:
1, owing to the signal that transmits in the hfc plant all transmits by the frequency division mode, so will solve the transmission channel problem of topological data.
2,,, guarantee that the flow direction of data is correct so will solve the problem that flows to of data-signal because hfc plant is branch type and star-like mixed network structure.
3, how to make all hfc plant equipment all know own position relation in hfc plant.
The method that the present invention deals with problems is as follows:
1, about the structure problem of transmission channel: because the hfc plant management system begins to be applied in radio, TV and film industries gradually, so down going channel and data feedback channel are reached an agreement in whole industry substantially, the down going channel frequency is chosen between 108MHz～112MHz, and the data feedback channel frequency is chosen between 5MHz～20MHz.
Because a certain hfc plant equipment in this scheme in the network will be informed the topological data information of his all subordinate equipments oneself, so the present invention will be in Fig. 2 is built a down going channel on each equipment (as optical receiver, trunk amplifier, two-way addressable hub, digital receiver) in the frame of broken lines of end " 3 " outer net of cable tv network system management system, in order to save cost, this passage is consistent with the data modulator frequency of front end, time-sharing multiplex.
2, data flow problem: because hfc plant belongs to branch type structure, the topological data of a certain node will be informed this all devices below node in this structure, so the flow direction of topological data should be to transmit downwards in the mode of broadcasting at this node.The front-end network management computer will determine whether the topological data of this node disposes on request, so this node will be in up sendaisle sends it back topological data the front-end network management computer, front-end network management computer data according to this determines that the topological data of this node finishes.
3, determine the position relation of the network equipment in hfc plant: because a hfc plant system is huge, data volume is just very big, in order to raise the efficiency fast, the present invention is specified the topological data of pressing broadcast mode transmission oneself as the equipment of a certain address in optical receiver, trunk amplifier, two-way addressable hub, the digital receiver by the front-end network management computer, when certain equipment is received the forwarding topology data command that the front-end network management computer sends, on the down going channel of this machine equipment, send the topological data of oneself by the mode of broadcasting.Simultaneously the data feedback channel at this machine equipment sends identical data, and the front-end network management computer is received that the topological data of confirming certain equipment after these data has been transmitted and finished, can carry out the topological data of next hfc plant equipment and transmit.
This equipment is after down going channel sends data, all subordinate equipments that are connected to this equipment all can be received these data, all equipment of these data of receiving all deposits these data in the net list of oneself in, in order to improve accuracy, higher level equipment can multiple continuously a few secondary data, correctly receive for subordinate equipment, in the net list of can not restoring during all existing identical data in the net list of subordinate equipment.
Whole process repeats, the forwarding of the topological data of all devices in finishing hfc plant, in the net list of all devices that this moment is online the net list of oneself finishing is arranged all, by front end the net list of all on-line apparatus is regained and carried out analyzing and processing, form the topological structure of hfc plant.
In order to improve the speed that whole topology generates, raise the efficiency fast, when topological data is transmitted, can save the topology of the last grade network equipment and transmit, because the last grade equipment has not had subordinate equipment.
How is the last grade equipment determined in network?
Because front end has only the address of each equipment, does not have topological diagram again, how to know which equipment is final stage device, fortunately in the hfc plant equipment various types of equipment are arranged, in complete hfc plant, the last level is hub or set-top box, so can distinguish final stage device easily by type.Because hub or set-top box almost account for 90% of hfc plant in the whole hfc plant, so when the practical topology data forwarding, can hub or set-top box not operated, can save a large amount of time.
Data uplink in the hfc plant, down going channel Close All after finishing each transmission.
Description of drawings
Fig. 1: the local figure of hfc plant of the present invention.
Fig. 2: patent of invention number 031177360, denomination of invention: based on the cable tv network system management system block diagram in the cable tv network system management system of geography information.
Fig. 3: front end webmaster computer flow chart among the present invention.
Fig. 4: transponder workflow diagram among the present invention.
Fig. 5: the topological tree structure that the embodiment of the invention generates.
Embodiment: see Fig. 1, the local figure of hfc plant of the present invention.
1, the network management computer sends the net list flush instructions of the network equipment, regenerates new net list data for guaranteeing hfc plant equipment, this instruction can pilosity several times, accurately empty with the net list that guarantees online all devices.
2, specify on-line apparatus A forwarding topology data by the network management computer
First step: after device A is received the forwarding instruction that the network management computer sends, open the uplink and downlink passage, the device address of this machine is sent to down going channel by broadcast mode, and these data also send at data feedback channel simultaneously, close the uplink and downlink passage after transmission finishes.
Second step: upstream data is delivered to the network management computer after arriving the demodulation of frame demodulator, confirms that this time instruction is finished after the network management computer is received, if the network management computer is confiscated back information, re-executes first step.
Third step: downlink data arrives subordinate equipment, and every equipment of these data of receiving all deposits the data of receiving in the equipment list of this machine in;
After finishing, data are as follows in the on-line apparatus equipment list separately:
Device A: sky
Equipment B: A
Equipment C:A
Equipment D:A
Equipment E:A
Equipment F:A
3, specify on-line apparatus B forwarding topology data by PC
First step: after equipment B is received the forwarding instruction that the network management computer sends, open the uplink and downlink passage, the device address of this machine is sent to down going channel by broadcast mode, and these data also send at data feedback channel simultaneously, close the uplink and downlink passage after transmission finishes.
Second step: upstream data is delivered to the network management computer after arriving the demodulator demodulation, confirms that this time instruction is finished after the network management computer is received, if the network management computer is confiscated back information, re-executes first step.
Third step: downlink data arrives subordinate equipment, and every equipment of these data of receiving all deposits the data of receiving in the equipment list of this machine in;
After finishing in the on-line apparatus equipment list separately data as follows:
Device A: sky
Equipment B: A
Equipment C:A, B
Equipment D:A, B
Equipment E:A, B
Equipment F:A, B
4, the rest may be inferred repeats above institute in steps, all generates new equipment list data up to on-line apparatus.(final stage device can not sent out, to save time)
After armamentarium is finished in the on-line apparatus equipment list separately data as follows:
Device A: sky
Equipment B: A
Equipment C:A, B
Equipment D:A, B
Equipment E:A, B, C
Equipment F:A, B, C
4, reclaim net list by the network management computer one by one by on-line apparatus, it is standby to deposit network management computer data table in.
See Fig. 5, handle the back by the network management Computer Analysis and forming the topological tree structure that this topological data need can be applicable in each application program of topological structure, can be used for checking the correctness after the networking, can be used for the location, accident analysis of definite network failure etc.
The described method that is used for determining topological structure of cable TV HFC network, for the situation that small number of devices withdraws from or augments, can be by manual amendment's network topology structure on the front-end network management computer.
The described method that is used for determining topological structure of cable TV HFC network, the situation that withdraws from or augment for large number quipments, can generate one time network topology structure more automatically, perhaps scribe area automatic generating network topological structure, its method restore one's right profit of attaching most importance to requires 1 first step to the six steps.
Be used for determining the method and the prior art Chinese patent publication number CN1449158A of topological structure of cable TV HFC network, a kind of network topology information acquisition method of denomination of invention, characteristics relatively are as follows:
1, a prior art is based on procotol, specially at data network.
B the present invention is based on free agreement (available any agreement), specially at analog network.
2, the method that in a prior art topology is generated is: a node is collected topological data to its contiguous node, can not stride multistage collection data.
The method that topology generates among b the present invention is: at a node to its all subordinate equipment broadcast data (no matter network progression what).
3, a prior art is applied to network itself and has data transmission capabilities.
B the present invention is applied to the ability that network itself does not possess transfer of data.
4, can find following difference from the 2nd:
The a prior art: node notifies its nearby contact to belong to the management of this node.
B the present invention: node notifies its following all devices and node to belong to the management of this node.
Claims (3)
1, a kind of method that is used for determining topological structure of cable TV HFC network, this method add the generation that the data answering device just can be finished topological structure based on transmitted in both directions cable TV HFC network in traditional cable television appliances, this transponder has following characteristics:
A, has a descending receive path
B, has a descending sendaisle
C, has a up sendaisle
More than two sendaisles open/close the control that is subjected to data command;
This method comprises:
First step: topological data generates, by the front-end network management computer designated equipment is sent data and generate instruction, designated equipment sends the mode of this machine topological data by broadcasting after receiving this instruction at descending sendaisle, send this data at data feedback channel simultaneously;
Second step: when the front-end network management computer was received above-mentioned topological data, expression generated the instruction executed by the previous data that send of front-end network management computer and finishes;
Third step: all every energy of equipment are received the equipment of above-mentioned topological data on the hfc plant, all these data are added in the network topology table of this machine;
The 4th step: generate instruction by sending data to next equipment then, repeat above-mentioned first step, make to add on the net list of each equipment and go up new device data to third step by the front-end network management computer;
The 5th step: send data by the front-end network management computer and generate instruction, continue to carry out above-mentioned first step respectively one by one to third step, make to add on the net list of each equipment and go up new device data by all the other equipment; Finish the generation of topological data up to whole hfc plant equipment;
The 6th step: the front-end network management computer is regained the network topology table of whole hfc plant equipment one by one by mode of unicast, carry out simple process by computer then and form whole topological structure of cable TV HFC network, finish the automatic generation of network topology structure.
2, the method that is used for determining topological structure of cable TV HFC network according to claim 1, for the situation that small number of devices withdraws from or augments, can be by manual amendment's network topology structure on the front-end network management computer.
3, the method that is used for determining topological structure of cable TV HFC network according to claim 1, the situation that withdraws from or augment for large number quipments, can generate one time network topology structure more automatically, perhaps scribe area automatic generating network topological structure, its method restore one's right profit of attaching most importance to requires 1 first step to the six steps.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2005100206965A CN1321530C (en) | 2005-04-12 | 2005-04-12 | Method in use for determining topological structure of cable TV HFC network |
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| CNB2005100206965A CN1321530C (en) | 2005-04-12 | 2005-04-12 | Method in use for determining topological structure of cable TV HFC network |
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| CN1697516A true CN1697516A (en) | 2005-11-16 |
| CN1321530C CN1321530C (en) | 2007-06-13 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101001363B (en) * | 2006-06-29 | 2011-01-12 | 华为技术有限公司 | System and method of data single broadcasting |
| CN108322822A (en) * | 2017-01-18 | 2018-07-24 | 华为技术有限公司 | Generation method, the device and system of the logical topology of cable TV network |
| CN112260859A (en) * | 2020-10-09 | 2021-01-22 | 无锡路通视信网络股份有限公司 | HFC network topology automatic acquisition method |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE514430C2 (en) * | 1998-11-24 | 2001-02-26 | Net Insight Ab | Method and system for determining network topology |
| CA2268495C (en) * | 1998-12-16 | 2008-11-18 | Loran Network Management Ltd. | Method for determining computer network topologies |
| US6704288B1 (en) * | 1999-10-07 | 2004-03-09 | General Instrument Corporation | Arrangement for discovering the topology of an HFC access network |
| CN1238991C (en) * | 2002-03-28 | 2006-01-25 | 华为技术有限公司 | Network topology information acquisition method |
| US8605623B2 (en) * | 2002-05-31 | 2013-12-10 | Koninklijke Philips N.V. | Determining and configuring a communication path in a network |
| CN1194547C (en) * | 2003-04-23 | 2005-03-23 | 四川汇源科技发展股份有限公司 | Geographic information based cable television network management system |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101001363B (en) * | 2006-06-29 | 2011-01-12 | 华为技术有限公司 | System and method of data single broadcasting |
| CN108322822A (en) * | 2017-01-18 | 2018-07-24 | 华为技术有限公司 | Generation method, the device and system of the logical topology of cable TV network |
| CN108322822B (en) * | 2017-01-18 | 2021-02-05 | 华为技术有限公司 | Method, device and system for generating logic topology of cable television network |
| CN112260859A (en) * | 2020-10-09 | 2021-01-22 | 无锡路通视信网络股份有限公司 | HFC network topology automatic acquisition method |
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