CN104954160A - Method for achieving multiple protection of bearer network, and bearer network - Google Patents
Method for achieving multiple protection of bearer network, and bearer network Download PDFInfo
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Abstract
The invention discloses a method for achieving the multiple protection of a bearer network, and the method comprises the steps: enabling SDH and PTN to be supported by an OTN (optical transmission network) in a unified manner; building different routing optical cables in all core interoffices of an OTN core layer; calculating the shortest path from a source end to a target end, and enabling the shortest path to serve as a protection path. The invention also discloses the bearer network achieving the multiple protection, and the bearer network comprises the SDH, the PTN, and the OTN. The SDH and the PTN are supporting by the OTN in a unified manner through a wave channel. The OTN comprises the core layer and a convergence layer, wherein the core interoffices of the core layer are provided with different routing optical cables. The OTN also comprises calculating equipment which is used for calculating the shortest path from the source end to the target end, and the shortest path serves as the protection path.
Description
Technical Field
The present invention relates to protection technologies in transport networks, and in particular, to a method for implementing multiple protection of a bearer network and a bearer network.
Background
Currently, bearer networks include: a Synchronous Digital Hierarchy (SDH), a Packet Transport Network (PTN), an Optical Transport Network (OTN), and the like; the 2G service is mainly carried on SDH, and the 3G service is mainly carried on PTN.
The network structures of the SDH, the PTN, and the OTN all include three parts, namely a core layer, a convergence ring, and an access ring, specifically, the core layer of the SDH is mainly supported by bare optical fibers, the convergence ring of the SDH is generally supported by optical cables, the long-distance segment is supported by the OTN, and the access ring of the SDH is supported by optical cables; the core layer of the PTN is carried by the OTN or the bare optical fiber, the convergence ring of the PTN is generally carried by the OTN or the optical cable, and the access ring of the PTN is carried by the optical cable; therefore, the SDH, the PTN, and the OTN are relatively independent and lack of uniformity, and are not beneficial to fully utilizing scarce protection resources when the SDH, the PTN, and the OTN are optimized and protected respectively; moreover, the SDH, the PTN, and the OTN are optimized and maintained respectively, which consumes more manpower and material resources.
On one hand, the existing SDH, PTN and OTN core interoffice loops are only based on the electrical layer sub-wavelength 1+1 protection of SDH, PTN and OTN own Passive Optical Network (PON) services; in OTN, the electrical layer sub-wavelength system mainly comprises: the system comprises a branch collecting unit, an electric cross unit and a group road collecting unit; the electric cross unit crosses the OTN basic frame unit, when receiving the optical signal, the group path convergence unit converges the crossed OTN basic frame unit, and then the branch path convergence unit completes the demultiplexing function of one or more service signals at the branch path side, thereby realizing the flexible scheduling of the sub-wavelength of the electric layer.
Taking an existing metro dense wavelength division multiplexing device as an example, briefly explaining the protection principle of the sub-wavelength 1+1 of the electrical layer, as shown in fig. 1, COMB is a branch convergence board, LD2 is a group convergence board, CSUB is a clock and signal cross processing unit, a sub-wavelength signal of COMB is connected to CSUB through a backplane bus, CSUB sends the signal to two different LDs 2 simultaneously, and then wavelength division Optical Channels (OCHs) of LD2 are sent to a working path and a protection path respectively, thereby realizing a 'concurrent' function; at a receiving end, the CSUB simultaneously receives services sent by LD2 from a working path and a protection path, and selects the service with good signal quality to send to the COMB according to the preferred conditions, so as to realize the 'optimal receiving' function; generally, the service of the working path is selected to be sent to the COMB, and when the service signal of the working path is interrupted or the quality of the service signal is degraded, the CSUB receives the service of the protection path, thereby ensuring the normal transmission of the service.
However, the core interoffice loops of SDH, PTN, and OTN are only based on the electrical layer sub-wavelength 1+1 protection of the own PON) service of SDH, PTN, and OTN, and all SDH, PTN, and OTN need to perform strict dual-route separation; therefore, with the increase of services and the doubling of the number of aggregation rings, the overlapping and the same-route separation of the aggregation layer optical cable and the core layer optical cable are very difficult; when the separation is not proper, a core convergence layer multi-point fault is generated, and a large amount of service interruption is caused.
On the other hand, SDH, PTN, and OTN aggregation layer network Protection generally employs a single ring network Protection, and an Optical Line automatic Protection (OLP) system is employed for a partial section to perform overlay Protection; the OLP system comprises an optical line automatic switching protector and network management software, wherein a plurality of optical line automatic switching protectors and a computer running the network management software form the OLP system; when the optical fiber is accidentally broken or the loss is increased to cause the communication quality to be reduced on the optical transmission line, the OLP system can automatically switch the optical transmission line route from the main route to the standby route within a very short time, so that the optical cable fault can be effectively prevented, and the communication interruption time caused by the optical cable fault is compressed from hours to milliseconds, thereby ensuring the normal work of the communication system.
As shown in fig. 2, there are two lines between a site a and a site B, and an optical transmission system selects one of the lines as a main line and the other line as a spare line, where the spare line is used to transmit a secondary signal or not to transmit a signal; when the communication quality is reduced due to a fault of a main line or a certain optical fiber/optical cable in the main line and the power of a signal monitored by a receiving end of the main line is reduced, a transmission signal route is automatically switched from the main line to a standby line, and an OLP device at the other end synchronously switches the line to the standby line so as to ensure normal transmission of the signal.
However, for a network in which a partial section is protected by superposition by using OLP, since OLP sections are dispersed and lack regularity, it is not possible to implement a network for a key service area, such as: and three paths of county-level central stations and the like are protected from the source end to the destination end.
Disclosure of Invention
In view of this, the embodiments of the present invention are expected to provide a method and a bearer network for implementing multiple protections of a bearer network, so as to implement unified bearer of SDH, PTN, and OTN, protection between a convergence layer and a core layer, and protection of a convergence layer key area when ring network protection fails due to a double-break fault.
The technical scheme of the embodiment of the invention is realized as follows:
the embodiment of the invention provides a method for realizing multiple protection of a bearer network, which comprises the following steps: uniformly bearing a Synchronous Digital Hierarchy (SDH) system and a Packet Transport Network (PTN) on an Optical Transport Network (OTN); establishing different routing optical cables among each core office of the OTN core layer; and calculating the shortest path from the source end to the destination end, and taking the shortest path as a protection path.
Preferably, the unified bearer of SDH and PTN on OTN includes: and the SDH and the PTN are borne on the OTN through the channels by utilizing the butt joint of the short-distance optical interface and the OTN channel board.
Preferably, the calculating the shortest path from the source end to the destination end includes: and calculating the consumption value from the source end to the destination end, and obtaining the shortest path from the source end to the destination end according to the minimum consumption value obtained by calculation.
Preferably, the calculating the source-to-destination cost value is: calculating the consumption value from the source end to the destination end according to COST = (∑ COST) multiplied by Q;
wherein, COST is the total paragraph consumption value, COST is the consumption value of each paragraph, and Q is the weight.
Preferably, the paragraph is: the distance between the two sites, cost, is set according to actual needs, and Q is the ratio of the number of paragraphs passed by the core office to the destination node to the number of paragraphs in the OTN loop.
An embodiment of the present invention further provides a bearer network for implementing multiple protections, including: SDH, PTN, and OTN; the SDH and the PTN are uniformly loaded on the OTN through a wave channel;
the OTN comprises: the optical fiber cable routing system comprises a core layer and a convergence layer, wherein different routing optical cables are arranged between core offices of the core layer;
the OTN further comprises: and the computing equipment is used for computing the shortest path from the source end to the destination end, and the shortest path is used as a protection path.
Preferably, the unified bearer of SDH and PTN on OTN includes: and the SDH and the PTN are borne on the OTN through the channels by utilizing the butt joint of the short-distance optical interface and the OTN channel board.
Preferably, the calculating the shortest path from the source end to the destination end includes:
and calculating the consumption value from the source end to the destination end, and obtaining the shortest path from the source end to the destination end according to the minimum consumption value obtained by calculation.
Preferably, the calculating the source-to-destination cost value is: calculating the consumption value from the source end to the destination end according to COST = (∑ COST) multiplied by Q;
wherein, COST is the total paragraph consumption value, COST is the consumption value of each paragraph, and Q is the weight.
Preferably, the paragraph is: the distance between the two sites, cost, is set according to actual needs, and Q is the ratio of the number of paragraphs passed by the core office to the destination node to the number of paragraphs in the OTN loop.
The method for realizing multiple protection of the carrier network and the carrier network provided by the embodiment of the invention firstly bear the SDH and the PTN on the OTN in a unified way, so that when the SDH, the PTN and the OTN need to be optimized and maintained, the protection resources can be fully utilized; different routing optical cables are established among core offices of the OTN core layer, automatic line protection switching is realized, and the core layer and convergence layer multi-point faults caused by difficult separation and improper separation due to overlapping of a plurality of same routes are avoided; and finally, calculating the shortest path from the source end to the destination end at the convergence layer, and taking the shortest path as a protection path to protect a heavy-end service area when the looped network protection fails due to the double-break fault of the looped network, thereby realizing the multiple protection of network bearing and maximizing the investment efficiency and the protection efficiency.
Drawings
FIG. 1 is a schematic diagram of the electrical layer wavelength 1+1 protection principle;
FIG. 2 is a schematic diagram of the operation of the OLP system;
fig. 3 is a schematic diagram of a basic processing flow of a method for implementing multiple protection of network bearers according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of an optical network in which SDH and PTN are collectively supported on an OTN according to an embodiment of the present invention;
fig. 5 is a schematic diagram of a network topology for establishing different routing optical cables between each core office of an OTN core layer according to an embodiment of the present invention;
fig. 6 is a schematic diagram illustrating a principle that different routing optical cables are established between each core office of an OTN core layer to implement multi-point fault protection according to an embodiment of the present invention;
fig. 7 is a schematic diagram illustrating a shortest path calculation principle according to an embodiment of the present invention;
fig. 8 is a schematic structural diagram of a bearer network implementing multiple protections according to an embodiment of the present invention.
Detailed Description
In the embodiment of the invention, SDH and PTN are uniformly loaded on OTN, different routing optical cables are established among each core office of an OTN core layer, and finally, the shortest path from a source end to a destination end is calculated and is used as a protection path.
Specifically, the calculating the shortest path from the source end to the destination end includes: calculating the consumption value from the source end to the destination end, and obtaining the shortest path from the source end to the destination end according to the minimum consumption value obtained by calculation;
wherein the calculating the source-to-destination cost value comprises: calculating the consumption value from the source end to the destination end according to COST = (∑ COST) multiplied by Q;
here, COST is the total paragraph COST value, COST is the COST value of each paragraph, and Q is the weight; the paragraphs are: the distance between the two sites, cost, is set according to actual needs, and Q is the ratio of the number of paragraphs passed by the core office to the destination node to the number of paragraphs in the OTN loop.
The basic processing flow of the multiple protection method of the embodiment of the invention is shown in fig. 3, and comprises the following steps:
step 101, uniformly bearing SDH and PTN on OTN;
specifically, an optical network structure that SDH and PTN are collectively supported on an OTN, as shown in fig. 4, is butted with an OTN channel board by using a short-distance optical interface, and supports the SDH and the PTN on the OTN through a 2.5G, or 10GE channel;
when the SDH and the PTN are uniformly loaded on the OTN, the core layer and the convergence layer of the OTN need to be separated, and the core layer and the convergence layer power supply system of the OTN need to be separated, so that full load service resistance caused by failure of OTN core equipment is avoided;
when the SDH and the PTN are uniformly supported on the OTN, it is necessary to place an OTN device at one end in each optical direction of the convergence layer end office to ensure that the unidirectional device fails without affecting optical paths in other directions;
when the SDH and the PTN are uniformly supported on the OTN, it is also necessary to keep the topology connection and the network element between two or more core offices connected to the convergence layer and each convergence node consistent.
Step 102, establishing different routing optical cables among each core office of an OTN core layer;
a network topology diagram of different routing optical cables is established between each core office of the OTN core layer, as shown in fig. 5, since the aggregation layer optical cable is routed or overlapped with one core layer optical cable, it is not necessarily routed or overlapped with another core layer optical cable. Therefore, OLP switching can be achieved by routing optical cables differently between each core office of the core layer; when the same route or the overlapped point has a fault, automatically switching to another core layer optical cable route; thereby ensuring that double-break faults can not occur in the core layer and the convergence layer.
Specifically, different routing optical cables are established among each core office of the OTN core layer, when the optical cables are established, the core layer is only responsible for different routing of the optical cables in the core layer, and the convergence layer is only responsible for different routing of the optical cables in the convergence layer, so that the difficulty of routing separation can be simplified, and the hidden danger of overlapping of a plurality of same routes is avoided; and when the core layer and the convergence layer simultaneously have faults, the service can be protected from being influenced.
The principle of establishing different routing cables between each core office of the core layer of the OTN to achieve multi-point fault protection is described in detail below, and as shown in fig. 6, the cables from core office a1 to core office B1 and the cables from core office a1 to core office D1 overlap in a well in the urban area, which may cause simultaneous interruption of the cables from core office a1 to core office B1 and the cables from core office a1 to core office D1 when a collapse occurs in the environment. In fig. 6, the thick black solid line represents the cable route, the thick black dotted line represents the OLP cable route, and the star polygon represents the failure point.
In this embodiment, SDH and PTN are collectively supported on an OTN, and different routes implemented by an OLP optical cable are established between a core office a1 and a core office B1; thus, the cable from core office a1 to core office D1 is routed the same as the cable from core office a1 to core office B1, and the cable from core office a1 to core office D1 is routed differently than the OLP cable from core office a1 to core office B1; when the optical cable from the core office a1 to the core office B1 fails, the traffic is switched from the OTN link from the core office a1 to the core office B1 to the OLP optical cable from the core office a1 to the core office B1, and likewise, the SDH and PTN links carried on the OTN are both kept in a normal working state.
At this time, the service path from the core office D to the core office a1 is from the core office D to the core office B1, and then to the core office a1 through the OLP link, so that service protection between the core layer and the convergence layer is realized when there are many core area routes.
Step 103, calculating a shortest path from a source end to a destination end, and taking the shortest path as a protection path;
specifically, firstly, calculating a consumption value from a source end to a destination end, and then obtaining a shortest path from the source end to the destination end according to a minimum consumption value obtained by calculation;
here, the calculation source-to-destination cost value is: calculating the consumption value from the source end to the destination end according to COST = (∑ COST) multiplied by Q;
wherein, COST is the total paragraph consumption value, COST is the consumption value of each paragraph, and Q is the weight; the paragraphs are: the distance between the two sites, cost, is set according to actual needs, and Q is the ratio of the number of paragraphs passed by the core office to the destination node to the number of paragraphs in the OTN loop.
The following describes in detail a detailed process of calculating a consumption value from a source end to a destination end according to an embodiment of the present invention with reference to fig. 7;
taking fig. 7 as an example, the OTM-C node 1 and the OTM-C node 2 in the key service area are target sites, and the core office 1 and the core office 2 connected to the convergence layer are source sites; calculating the consumption value from the source end to the destination end according to COST = (∑ COST) multiplied by Q; wherein,
the key business area refers to a county city or a township area with the population more than 10 ten thousand; because the key service area needs to have the three-route emergency protection capability and the services are mainly concentrated in the core bureau, when performing service protection, a one-way source end to a destination end needs to reach a certain core bureau, that is: the three routes from source to destination are protected.
COST is the total paragraph consumption value, COST is the consumption value of each paragraph, and Q is the weight;
specifically, the distance between two stations is called a paragraph; the paragraph includes the trunk section and the end office section, the paragraph with the relay station at one end is the trunk section, the paragraph whose both end net elements are all the terminal equipments is called the end office section; wherein, two nodes in a key service area can not be used as paragraphs, and two core offices can not be used as paragraphs.
The cost of each paragraph is set according to actual needs, in this embodiment, the paragraph cost less than 80 km is set to be 1, the paragraph cost greater than 80 km and less than 100 km is set to be 2, the paragraph cost greater than 100 km and less than 120 km is set to be 3, the paragraph cost of the relay paragraph is set to be 2, and the terminal paragraph cost is set to be 5.
Q is the ratio of the number of paragraphs passing through the core office to the destination node to the number of paragraphs in the OTN loop; in the embodiment of the present invention, the number of paragraphs in the OTN loop is 8, the number of paragraphs passing from the core office 1 to the OTM-C node 2 in the key service area is 5, and the number of paragraphs passing from the core office 2 to the OTM-C node 1 in the key service area is 3.
Thus, COST =16 × 5/8=10 from the core office 1 to the focal service area OTM-C node 2;
COST =14 × 3/8=5.25 from core office 2 to the focal service area OTM-C node 1;
obtaining the shortest path from the source end to the destination end as a paragraph from the core office 2 to the key service area OTM-C node 1 according to the calculated path consumption value; i.e. selects this path for OLP.
In order to implement the above multiple protection method, an embodiment of the present invention further provides a bearer network for implementing multiple protection, where a structure of the bearer network is shown in fig. 8, and the bearer network includes: SDH11, PTN12, and OTN 13;
the SDH11 and the PTN12 are uniformly carried on the OTN13 through a wave channel;
the OTN comprises: the optical fiber cable routing system comprises a core layer and a convergence layer, wherein different routing optical cables are arranged between core offices of the core layer;
the OTN further comprises: and the computing device 110 is used for computing the shortest path from the source end to the destination end, and the shortest path is used as a protection path.
Wherein the computing device may be implemented by existing software.
Here, the unified bearer of SDH and PTN on OTN includes: and the SDH and the PTN are borne on the OTN through the channels by utilizing the butt joint of the short-distance optical interface and the OTN channel board.
The calculating the shortest path from the source end to the destination end comprises: and calculating the consumption value from the source end to the destination end, and obtaining the shortest path from the source end to the destination end according to the minimum consumption value obtained by calculation.
Here, the calculation source-to-destination cost value is: calculating the consumption value from the source end to the destination end according to COST = (∑ COST) multiplied by Q;
wherein, COST is the total paragraph consumption value, COST is the consumption value of each paragraph, and Q is the weight. The paragraphs are specifically: the distance between the two sites, cost, is set according to actual needs, and Q is the ratio of the number of paragraphs passed by the core office to the destination node to the number of paragraphs in the OTN loop.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention.
Claims (10)
1. A method for implementing multiple protections of a bearer network, the method comprising:
uniformly bearing a Synchronous Digital Hierarchy (SDH) system and a Packet Transport Network (PTN) on an Optical Transport Network (OTN);
establishing different routing optical cables among each core office of the OTN core layer;
and calculating the shortest path from the source end to the destination end, and taking the shortest path as a protection path.
2. The method for implementing multiple protections of a bearer network according to claim 1, wherein the unified bearer of SDH and PTN on OTN comprises: and the SDH and the PTN are borne on the OTN through the channels by utilizing the butt joint of the short-distance optical interface and the OTN channel board.
3. The method of claim 1, wherein the calculating the shortest path from the source end to the destination end comprises:
and calculating the consumption value from the source end to the destination end, and obtaining the shortest path from the source end to the destination end according to the minimum consumption value obtained by calculation.
4. The method of claim 3, wherein the calculating the source-to-destination cost value is:
calculating the consumption value from the source end to the destination end according to COST = (∑ COST) multiplied by Q;
wherein, COST is the total paragraph consumption value, COST is the consumption value of each paragraph, and Q is the weight.
5. The method of claim 4, wherein the paragraphs are: the distance between the two sites, cost, is set according to actual needs, and Q is the ratio of the number of paragraphs passed by the core office to the destination node to the number of paragraphs in the OTN loop.
6. A bearer network for implementing multiple protections, the bearer network comprising: SDH, PTN, and OTN; the SDH and the PTN are uniformly loaded on the OTN through a wave channel;
the OTN comprises: the optical fiber cable routing system comprises a core layer and a convergence layer, wherein different routing optical cables are arranged between core offices of the core layer;
the OTN further comprises: and the computing equipment is used for computing the shortest path from the source end to the destination end, and the shortest path is used as a protection path.
7. The bearer network for implementing multiple protections according to claim 6, wherein said unified bearer of SDH and PTN over OTN comprises: and the SDH and the PTN are borne on the OTN through the channels by utilizing the butt joint of the short-distance optical interface and the OTN channel board.
8. The bearer network for implementing multiple protections according to claim 6, wherein said calculating the shortest path from the source end to the destination end comprises:
and calculating the consumption value from the source end to the destination end, and obtaining the shortest path from the source end to the destination end according to the minimum consumption value obtained by calculation.
9. The carrier network for implementing multiple protections as claimed in claim 8, wherein the calculation of the source-to-destination cost value is:
calculating the consumption value from the source end to the destination end according to COST = (∑ COST) multiplied by Q;
wherein, COST is the total paragraph consumption value, COST is the consumption value of each paragraph, and Q is the weight.
10. The bearer network implementing multiple protections according to claim 9, wherein the paragraphs are: the distance between the two sites, cost, is set according to actual needs, and Q is the ratio of the number of paragraphs passed by the core office to the destination node to the number of paragraphs in the OTN loop.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107294853A (en) * | 2017-07-12 | 2017-10-24 | 国网山东省电力公司经济技术研究院 | A kind of powerline network method for optimizing route |
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