CN1665174A - Apparatus for providing node protection in optical network and implementing method thereof - Google Patents
Apparatus for providing node protection in optical network and implementing method thereof Download PDFInfo
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Abstract
The invention relates to a node protecting device in an optical network and its protecting method, and as needing to break a node master channel off the network by some reasons, the invention can switch transmission service from the node master channel to a node backup channel, thus avoiding the interruption of service transmission and strengthening the transmitting reliability of the optical network. The invention relatively conveniently maintains, detects and upgrades the node master channel on the condition of ensuring normal running of existing service transmission. Therefore, the invention reduces the cost in upgrading and capacity expansion of the equipment, and is convenient to maintain node equipment.
Description
Technical field
The present invention relates to network communications technology field, relate in particular to device and its implementation that Node Protection is provided in a kind of optical-fiber network.
Background technology
Along with the development of optical communication technique, the traffic carrying capacity of optical-fiber network transmission also increases day by day.Because people are more and more higher to the requirement of network communication quality; protection to optical-fiber network also seems more and more important; the protection of so-called optical-fiber network is exactly when certain part in the optical-fiber network breaks down; should guarantee that loaded service continues normal transmission in the network, guarantee that promptly the user of optical-fiber network can not obviously perceive the fault that occurs in the network.
In present optical-fiber network transmission course; the safeguard measure of common optical-fiber network all is to realize by redundance unit mostly; independently backup cable link that adopts as the optical terminus equipment of the reserve adopted based on the protection of optical terminus equipment, based on the protection of optical link etc.; in a single day optical terminus equipment or optical link in optical-fiber network break down; then switch on the standby equipment or link by the equipment change action; thereby recover to provide normal service, guarantee the continuous of professional transmission.
The concrete implementation of described protection based on optical terminus equipment as shown in Figure 1; during the system operate as normal; the main business signal is by the transmission link transmission back arrival receiving terminal Rx11 of transmitting terminal Tx11 through system; when the working equipment Tx11 of optical terminus equipment in the optical-fiber network or Rx11 break down, then can switch to immediately on the alternate device Tx12 or Rx12 of corresponding optical terminus equipment.Alternate device and working equipment can be configurations in 1: 1, and also can be according to the fault probability of happening by 1: N dispatches, and N is the positive integer greater than 1.Like this, the fault that occurs for the optical terminus equipment in the optical-fiber network has realized corresponding reliable protection function, promptly when described optical terminus equipment breaks down, can not cause the interruption of transport service in the optical-fiber network.
The concrete implementation of described protection based on optical link as shown in Figure 2; during the system operate as normal; light signal carries out the transmission of data service between transmitting terminal Tx and receiving terminal Rx by working line 1; after working line 1 breaks down; then working line 1 is switched to spare line 2, between transmitting terminal Tx and receiving terminal Rx, carry out the transmission of data service by spare line 2.Like this; the fault that occurs for a certain section optical link in the optical-fiber network has realized corresponding reliable protection function; promptly when described optical link breaks down; carry out the transmission of data service by spare line 2; and can not cause the interruption of the data service transmitted in the optical-fiber network, reliability of service transmission in the optical-fiber network of assurance.
By the description of above-mentioned prior art situation as can be seen: described only protection of protection for providing at the single channel transport service based on optical terminus equipment, promptly only protect, then can't provide protection for transmission link and each intermediary device of link at the optical terminus equipment that one tunnel transport service is provided; And the realization of described protection based on optical link needs at least two independently optical cables, and can only protect this section transmission link, then can't provide corresponding protection for the transmission equipment in the optical-fiber network.
That is to say, in optical-fiber network on transmission link except optical terminus equipment and each internodal optical fiber link, also exist some in the transport service process, to play the equipment of each node of key effect.And prior art does not provide protection to node corresponding equipment, and therefore, protection scheme of the prior art does not provide corresponding protection for the professional transmission course of overall optical network.
Summary of the invention
In view of above-mentioned existing in prior technology problem; the purpose of this invention is to provide device and its implementation that Node Protection is provided in a kind of optical-fiber network; thereby make when the node device in the optical-fiber network breaks down, can not have influence on the reliability of overall optical Network Transmission business equally.
The objective of the invention is to be achieved through the following technical solutions:
The device of Node Protection is provided in the optical-fiber network provided by the invention; comprise: node master channel, node alternate channel and node primary channel choice device, node primary channel choice device is according to the handover operation between node operating state Control Node master channel and node alternate channel.
Described node master channel and node alternate channel can be the individual feature equipment in one section optical patchcord, the intra-node main optical path, the equipment that several light paths are accepted mutually or all functions equipment of whole node respectively.
Described node master channel and node alternate channel respectively can be active equipment or inactive component.
Described node primary channel choice device can be the combination of optical switch or optical branching device and optical switch.
Described node primary channel choice device can be the shared node primary channel choice device in the two ends of node, also can adopt a node primary channel choice device respectively for two ends.
Described node primary channel choice device perhaps carries out the selection of the primary, spare passage of node automatically for manually to carry out the selection of the primary, spare passage of node by external command according to the fault detection mechanism of network.
The present invention also provides the method that Node Protection is provided in a kind of optical-fiber network based on said apparatus, comprising:
A, the incident that the primary channel switching takes place to carry out in the node of optical-fiber network;
B, running node primary channel choice device make it select the primary, spare passage of node corresponding to enter operating state, the transmission process of the business of the node of being responsible for flowing through.
Described steps A comprises:
When needs are safeguarded the current master channel of node, be defined as taking place to carry out the incident that primary channel switches, the service processing function of node need be switched to the node alternate channel, described maintenance comprises at the recovery of the detection of the current master channel of node, upgrading or fault to be handled, and described current master channel is current in running order node passage.
Described step B comprises:
By external command manual operation node primary channel choice device or according to the automatic running node primary channel of the fault detection mechanism in network choice device, make it select application corresponding passage to enter operating state, the transmission process of the business of the node of being responsible for flowing through.
Described step B also comprises:
When the node master channel recovers just often, can select running node primary channel choice device again, with the output after the node master channel is handled again of corresponding transport service.
As seen from the above technical solution provided by the invention; Node Protection device provided by the invention and its implementation; in the time of can the node master channel breaks down in optical-fiber network; the function that the node master channel need be finished switches on the node alternate channel and realizes; thereby guaranteed that the Shi Buhui that breaks down of the node device in the optical-fiber network causes professional interruptions in transmissions, improved the reliability of optical-fiber network transmission.
Simultaneously, the present invention has also realized the function of the online smooth upgrade of each node device, promptly when the node device in the optical-fiber network need be upgraded, the function that the node master channel need be finished can be switched on the node alternate channel equally and realize, when upgrade job is finished, switch back the node master channel again.
That is to say; the present invention can isolate the node master channel according to actual needs at any time from the transport service of optical-fiber network; thereby realized guaranteeing under the situation that the ongoing professional transmission of optical-fiber network is normally carried out; comparatively easily to the node master channel safeguard, detect, operation such as upgrading; and behind corresponding EO; the node master channel is inserted function in the optical-fiber network again, and realization of the present invention has reduced the cost of optical-fiber network upgrading, has protected the existing investment of user.
Description of drawings
Fig. 1 is the schematic diagram based on the protection of optical terminus equipment;
Fig. 2 is the schematic diagram based on the protection of optical link;
Fig. 3 is a structural representation of the present invention;
Fig. 4 is the structural representation of specific implementation of the present invention;
Fig. 5 utilizes the present invention to carry out the schematic diagram of node device protection;
Fig. 6 utilizes the present invention to carry out the schematic diagram of node device upgrading.
Embodiment
Core concept of the present invention is the node device configuration node alternate channel of node for protecting at optical-fiber network; protected node device is then as corresponding node master channel; like this; when the node master channel of node breaks down; when perhaps needing to carry out the upgrade expanding operation; just the function that is realized by master channel originally can be switched on the node alternate channel and realize, thereby realize farthest protecting existing transport service in the optical-fiber network.
Device of the present invention mainly comprises three parts, and be arranged at the intra-node of optical-fiber network, described three parts are respectively: node primary channel choice device, node master channel and node alternate channel, introduce the light signal of node and select definite node master channel or the output of node alternate channel by node primary channel choice device, node primary channel choice device is that the selection that the need of work according to node carries out between node master channel or node alternate channel is switched, under normal circumstances, node primary channel choice device selects the node master channel in running order, carry out the corresponding business transmission process, reason causes and it need be separated from the business that node is transmitting if the node master channel maybe needs to carry out upgrading processing etc. owing to breaking down, then require node primary channel choice device select the node alternate channel carry out this node in the corresponding business transmission process.
The embodiment of device of the present invention as shown in Figure 3; described interface module is node primary channel choice device of the present invention; the interface module operational module provides the selection function of service transmission path; be used for gating node master channel or node alternate channel; transport service for a direction; the main optical path signal inserts protective device via active and standby choice device; can select by main with or extension wire transmit, return main optical path again by active and standby choice device again and transmit.
Structurally some is similar to the implementation of the protection based on optical link of the prior art to device of the present invention; but the present invention is applied to the intra-node of optical-fiber network; with respect to the tangible difference of each several part function of the technical scheme of the protection based on optical link of the prior art, node master channel that promptly relates among the present invention and node alternate channel are that intranodal carries out the function device of professional transmission process and connection line etc.Among the present invention, the configuration ratio of components of described node master channel, node alternate channel is more flexible, can be one section optical patchcord (this configuration is generally the upgrade interface that system reserves), also can be the individual feature equipment in the main optical path in the node, it can also be the function device that several light paths are accepted mutually, even can also be all functions equipment of whole node, this just good expandability has satisfied the demand of system upgrade dilatation.Described node alternate channel can be and the identical function device of node master channel, finish identical functions; Also can be simply keep the transmission light path unimpeded, introduce a certain amount of decay as direct employing optical patchcord short circuit or according to the actual attenuation situation of node master channel.
The stability that also needs to consider optical network system in the layoutprocedure of carrying out node master channel, node alternate channel, node alternate channel and node master channel have identical attenuation can avoid light path to switch the time, and power produces the harmful effect that sudden change is brought.
Because the node in the optical network system need be the node master channel usually; the node alternate channel provides power back-off simultaneously; therefore the backup of image intensifer can be provided in the node alternate channel; in the protective device as shown in Figure 4 at Node B; the node master channel; include an image intensifer 3 in the node alternate channel; the backup of image intensifer promptly is provided in the node alternate channel of the described protective device in Node B place; like this; when breaking down, the node master channel of Node B maybe needs upgrading; safeguard when handling; just can it be separated from transmission path by the corresponding operating of interface arrangement 4, corresponding power back-off is then provided by the image intensifer in the node alternate channel.Equally, what the protective device of the node A among the present invention then adopted is the same image intensifer 3 of node master channel, node alternate channel common application, and this application can reduce the cost of Node Protection greatly.In a word, the present invention can be according to the realization cost of protective device, and the respective nodes defencive function that need provide, and carries out the configuration of node master channel, node alternate channel.
Among the present invention owing to adopted the structure of node primary channel choice device and node master channel, node alternate channel, therefore the device type of the function device that comprises of described node master channel, node alternate channel both can include source device, also can comprise inactive component.
Among the present invention be by external command manually the described node primary channel choice device of control carry out the selection of transmission path, this method can be so that the implementation structure of device of the present invention be fairly simple, and reliable in action.Simultaneously, the present invention also can carry out the selection of transmission path automatically by the order that corresponding fault detection mechanism and turning protocol produce, for example, when the node master channel in detecting node breaks down, then issue and switch order accordingly, described node primary channel choice device is switched the processing of switching that node master channel, node alternate channel are carried out in order according to described, thereby realizes the automatic selection of transmission path.
Because communication equipment is to network configuration requirement switching time very high (50 milliseconds or shorter), so the optical switch of selected technology maturation is as the node primary channel choice device Primary Component among the present invention, and adopt and directly to issue the switching command optical switch and control its selection transmission path, to satisfy communication equipment to the network configuration requirement of switching time, if carrying out light path again after adopting fault detection mechanism to confirm unusually switches, look the complexity of master channel, the time of whole detection and handoff procedure may be slightly long, needs to be optimized according to actual conditions; The structure of described node primary channel choice device can be optical switch, and can one 1 * 2 optical switch respectively be set in the input and output side in the node, also can shared one 2 * 2 optical switch of input and output side, described node primary channel choice device can also adopt 50/50 optical branching device and 1 * 2 optical switch to form jointly.
Among the present invention, described node primary channel choice device can be developed on existing node transmission equipment basis, also can directly adopt existing equipment or device with close function, as the path selection device that adopts in the protection based on optical link.
Can recognize by the description of front the embodiment of device of the present invention in conjunction with described device method of the present invention to be described further below again, this method comprises:
Step 1: in the optical-fiber network, in the time need safeguarding to the node master channel of node, determine and the node master channel need be switched on the node alternate channel, and be responsible for the corresponding business transmission process by the node alternate channel, described maintenance comprises at recovery processing of the detection of node master channel, upgrading or fault etc.;
During the optical network system operate as normal, work in the light path at node master channel place, be on each function device of node, if in case confirm that protected node master channel breaks down, perhaps this node operation such as need upgrade is then determined the corresponding business transmission and processing process to be switched to realize on the node alternate channel;
Step 2: by external command manual operation node primary channel choice device or according to the automatic running node primary channel of the fault detection mechanism in network choice device, make it select the application node alternate channel to enter operating state, and with the output after the node alternate channel is handled of corresponding transport service;
Step 3: when the node master channel recovers just often, system can still be operated on the alternate channel, also can running node primary channel choice device, and make it select application node master channel to enter operating state.
After switching to the transmission of the business of node on the node alternate channel, the node master channel promptly isolates from the transmission line of node, and at this moment, the user just can keep in repair, changes, upgrades or change configuration or the like and operate;
Simultaneously, because the attenuation of node alternate channel is adjusted in advance, therefore, the business transmission of switching posterior nodal point is for main optical path, power is constant substantially, and transport service is unaffected substantially, if having local service on the node master channel, then because these business depend on the node master channel realizes and will inevitably be affected, but that the overall optical network system still can keep is stable to greatest extent.
Description by the front as can be seen; the present invention is not only applicable to the protection of node master channel when breaking down; can also provide great convenience for the upgrade expanding of node master channel, below more in conjunction with the accompanying drawings, application of the present invention be described with corresponding concrete application example:
In light network transmission system, OADM (Optical Add/Drop Multiplexer, optical add/drop multiplexer) application is very extensive, by OADM, not only can realize the flexible net configuration, more can directly in the light territory, realize the function of road up and down of light signal, promptly can directly isolate or add the light signal of specific wavelength by OADM equipment in the line, and be not subjected at all to influence for all the other break-through wavelength that continue transmission, have great cost advantage than traditional light/electricity/light conversion.The wavelength that present the most widely used OADM equipment can only be fixed up and down, though the dynamic OADM equipment of Add/drop wavelength occurred freely to select, but because cost and technology, the use of this dynamic OADM equipment that can freely select Add/drop wavelength also seldom.
Yet growth along with business demand; through regular meeting need be on the legacy network configure base upgrade expanding; if adopt traditional updating operation method; then must disconnect main optical path; just can insert new OADM equipment; like this, will inevitably cause transport service to interrupt, especially occupy the punch-through service of most transmission wavelengths.At this moment, if employing the present invention, then only need when the node of optical-fiber network carries out the configuration of node master channel, node alternate channel, OADM equipment to be divided into node master channel, can realize the smooth upgrade dilatation operation of this equipment, and punch-through service is unaffected substantially when guaranteeing operation, has only this locality that wavelength occupies the minority ripple is professional up and down temporarily to interrupt.Owing to adopted technical scheme provided by the invention; as shown in Figure 5; when needs carry out upgrade expanding to original OADM equipment Old OADM; the node master channel that only needs to include corresponding OADM equipment by interface arrangement switches on the node alternate channel; just can increase or replace with original OAMD equipment Old OADM dilatation newly new OADM equipment New OADM afterwards; make that originally the OADM equipment of fixed wave length can carry out upgrade expanding comparatively easily up and down; thereby make it on allomeric function, also can possess the characteristic of certain dynamic adjustment wavelength; therefore, the present invention has protected user's existing investment effectively.
In addition, in the node master channel of the present invention, if be provided with the online upgrading interface, as shown in Figure 6, be pre-prepd direct-connected optical patchcord, insert newly-increased module in the time of then can also being implemented in upgrading, described newly-increased module is for providing new function device or module, can be traditional all kinds of optical transmission devices, more can be some special functional modules, as light power equalization, dispersion compensation, OXC (Optic Cross Connect, optical cross connect) equipment.At this moment, for the power output that guarantees node is in normal power level, what also need to consider is, Insertion Loss as the functional module that inserts or equipment is less, can solve corresponding Insertion Loss problem by the link power budget adjustment, otherwise, then need to increase separately the power back-off measure and solve corresponding Insertion Loss problem, but arrangement image intensifer 3 as shown in Figure 6.
The above; only for the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, and anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claims.
Claims (10)
1, the device of Node Protection is provided in a kind of optical-fiber network; it is characterized in that comprising: node master channel, node alternate channel and node primary channel choice device, node primary channel choice device is according to the handover operation between node operating state Control Node master channel and node alternate channel.
2, the device of Node Protection is provided in the optical-fiber network according to claim 1, it is characterized in that described node master channel and node alternate channel can be the individual feature equipment in one section optical patchcord, the intra-node main optical path, the equipment that several light paths are accepted mutually or all functions equipment of whole node respectively.
3, the device of Node Protection is provided in the optical-fiber network according to claim 1 and 2, it is characterized in that described node master channel and node alternate channel respectively can be active equipment or inactive component.
4, the device of Node Protection is provided in the optical-fiber network according to claim 1, it is characterized in that described node primary channel choice device can be the combination of optical switch or optical branching device and optical switch.
5, according to the device that Node Protection is provided in claim 1 or the 4 described optical-fiber networks; it is characterized in that described node primary channel choice device can be the shared node primary channel choice device in the two ends of node, also can adopt a node primary channel choice device respectively for two ends.
6, the device of Node Protection is provided in the optical-fiber network according to claim 5; it is characterized in that described node primary channel choice device for manually to carry out the selection of the primary, spare passage of node by external command, perhaps carries out the selection of the primary, spare passage of node automatically according to the fault detection mechanism of network.
7, the method for Node Protection is provided in a kind of optical-fiber network based on said apparatus, it is characterized in that comprising:
A, the incident that the primary channel switching takes place to carry out in the node of optical-fiber network;
B, running node primary channel choice device make it select the primary, spare passage of node corresponding to enter operating state, the transmission process of the business of the node of being responsible for flowing through.
8, the method for Node Protection is provided in the optical-fiber network according to claim 7, it is characterized in that described steps A comprises:
When needs are safeguarded the current master channel of node, be defined as taking place to carry out the incident that primary channel switches, the service processing function of node need be switched to the node alternate channel, described maintenance comprises at the recovery of the detection of the current master channel of node, upgrading or fault to be handled, and described current master channel is current in running order node passage.
9, according to the method that Node Protection is provided in claim 7 or the 8 described optical-fiber networks, it is characterized in that described step B comprises:
By external command manual operation node primary channel choice device or according to the automatic running node primary channel of the fault detection mechanism in network choice device, make it select application corresponding passage to enter operating state, the transmission process of the business of the node of being responsible for flowing through.
10, the method for Node Protection is provided in the optical-fiber network according to claim 9, it is characterized in that described step B also comprises:
When the node master channel recovers just often, can select running node primary channel choice device again, with the output after the node master channel is handled again of corresponding transport service.
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| CN200410008320A CN100596037C (en) | 2004-03-03 | 2004-03-03 | Apparatus for providing node protection in optical network and implementing method thereof |
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| CN200410008320A CN100596037C (en) | 2004-03-03 | 2004-03-03 | Apparatus for providing node protection in optical network and implementing method thereof |
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| WO2008083575A1 (en) * | 2006-12-27 | 2008-07-17 | Huawei Technologies Co., Ltd. | An optical source link transmission device and method |
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| CN101237622B (en) * | 2008-03-10 | 2011-06-22 | 中兴通讯股份有限公司 | Disaster tolerance control device |
| CN101291545B (en) * | 2008-06-04 | 2010-12-01 | 杭州华三通信技术有限公司 | Light path protected seamless switching method and light path protecting equipment |
| CN101616032B (en) * | 2009-07-20 | 2012-07-18 | 中兴通讯股份有限公司 | Method and device for realizing cross capacity upgrade |
| CN106452834A (en) * | 2016-08-31 | 2017-02-22 | 大连环宇移动科技有限公司 | Method for guaranteeing series connection equipment to keep consistency of main/standby network ports in communication process |
| CN110091757A (en) * | 2018-01-31 | 2019-08-06 | 株洲中车时代电气股份有限公司 | A kind of ground automatic neutral-section passing device having redundancy feature and control method |
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| CN110440391A (en) * | 2019-08-07 | 2019-11-12 | 珠海格力电器股份有限公司 | Loop network guard method, air-conditioning system |
| CN110446125A (en) * | 2019-08-27 | 2019-11-12 | 成都华跃科技有限公司 | Optical network system, optical path switching method, light switching command delivery method and optical branching equipment |
| CN110446125B (en) * | 2019-08-27 | 2024-05-24 | 成都华跃科技有限公司 | Optical network system, optical path switching method, optical switching instruction issuing method and optical branching device |
| CN113596630A (en) * | 2021-05-17 | 2021-11-02 | 北京邮电大学 | Routing resource allocation method and device for hybrid grid optical network |
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