CN100574208C - In the optical-fiber network based on the restoration methods and the device that connect - Google Patents
In the optical-fiber network based on the restoration methods and the device that connect Download PDFInfo
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- CN100574208C CN100574208C CNB2004100546055A CN200410054605A CN100574208C CN 100574208 C CN100574208 C CN 100574208C CN B2004100546055 A CNB2004100546055 A CN B2004100546055A CN 200410054605 A CN200410054605 A CN 200410054605A CN 100574208 C CN100574208 C CN 100574208C
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Abstract
The present invention discloses in a kind of optical-fiber network based on the restoration methods and the device that connect, all recovery process is described as the again foundation of abstract connection.The at first connection of definition different levels in network is finished recovery process on the connection basis of different levels then.Each connection has represented a series of network elements that transmit from the source to the set that purpose transmits the network element physical resource, sets up on the basis that is connected the lower level physical network of lower level, has bigger bandwidth granularity; Being connected on the higher level physical network basis of higher level set up, and has littler bandwidth granularity.Require the high-rise basis that is connected the low layer connection to set up in the process that connects, recovery process is preferentially finished on the basis that low layer connects; The process of recovering is exactly the process that rebulids that connects.Adopt the present invention to be easy on existing network, realize, and can improve the efficient of recovering.
Description
Technical field
The present invention relates to a kind of optical transfer network field, particularly a kind of restoration methods of optical-fiber network and device.
Background technology
The recovery of current optical transfer network is divided into dual mode.A kind of recovery that is based on link, a kind of recovery that is based on passage.So-called recovery based on link refers to switch take link as the basis, and the link that uses link switching idle in the network to fall fault after fault takes place guarantees professional survivability.So-called recovery based on passage is meant switches based on passage, after fault takes place according to the idling-resource in the network re-construct one end to end passage switch be subjected to fault effects passage to guarantee the survivability of business.In use they all combine closely with specific physical resource form.What for example the link of WDM network referred to is exactly single or a branch of physical fiber, the wavelength channel that in fact passage refers to.
Often have than speed faster based on the recovery of link in these cases, but also have the defective that much can't overcome.At first it can't recover for independent passage, seems helpless when only channel failure taking place.Secondly it can not recover node failure, need to adopt other auxiliary method to recover when whole transmission node power down.In addition, the granularity of link is usually bigger, in order to guarantee effectively to recover usually to need to reserve more idling-resource.
Can effectively improve defective based on the recovery of passage, but also there is certain defective in the recovery self that is based on passage based on link-recovery.It is mainly manifested in the restriction on resume speed and the scale.This is that an independent link failure can cause a plurality of channel failures because a link in the network can comprise a plurality of passages.Along with the number of active lanes in the link increases, also will increase by the port number of fault effects, for the heavy-route computational process of each channel start will become the bottleneck that influences resume speed.In addition, when the routing restoration quantity that causes is excessive, recover the collapse that employed signaling also can cause signaling network, cause recovering failure.This just requires must consider the channel failure quantity that the single network fault can cause when using routing restoration.
Therefore there is document to propose to adopt the mode of passage binding to realize routing restoration, to avoid in the routing restoration process because the problem that the recovery signaling of processing is excessive and the route Calculation bottleneck causes.But in order to realize that binding recovers, passage needs unified planning when setting up business, and the binding channels of foundation needs management separately.This has not only brought managerial expense, and can become very dumb.In n the passage that usually occurs bundling a channel failure is only arranged, in the process of switching, but need other n-1 passage is switched.Even this n-1 passage does not break down, the business above it still need to face service disconnection in short-term.In case recover failure, also will face professional possibility of interrupting fully.
Also have to research and propose and in network, use simultaneously based on the recovery of passage with based on the recovery of link.But owing to be applied on the physical resource of different levels, two kinds of Restoration Mechanism are used simultaneously and are meaned that needs solve the coordination problem of multitiered network recovery and the problem of management of different levels physical resource.This problem also is in the stage of discussion at present, and it is to be solved to exist a lot of problems to have, and for example recovers the problem of conflict.In addition, keep simultaneously two kinds of Restoration Mechanism in the system and not only equipment is realized proposing very high requirement, operation maintenance is also proposed higher requirement.Although some equipment can provide two kinds of Restoration Mechanism simultaneously, in the process of actual motion, generally also only can select a kind of Restoration Mechanism wherein.
Summary of the invention
The present invention proposes in a kind of optical-fiber network based on the recovery device that connects, realized connecting smooth upgrade on the framework of setting up existing, in recovery, do not need to consider the details of network.
The invention allows in a kind of optical-fiber network based on the restoration methods that connects, preferentially connect at low layer and connect, improve resume speed; Can also coordinate the recovery between the multitiered network.
Device of the present invention is connected on each network element device in the optical-fiber network, and this device comprises: a control module and a cross unit; Control module is used for setting up, discharging and the connection that is connected different levels; Export in another passage of the output port that the signal cross that cross unit is used for a certain passage that input port is received is selected to control module, and the state of signal reports to described control module to produce alarm in the monitoring channel.
Preferably, described cross unit comprises a series of input ports, a series of output port and a Cross module, and the signal that this Cross module is used for that certain wavelength channel on the input port is entered switches to another wavelength channel of output port through Cross module; The monitoring and controlling channels that Cross module is monitored optical link simultaneously produces the signal generation wavelength channel alarm that wavelength channel was alarmed and monitored to optical link.
Preferably, described control unit comprises: link control module, switch control module, topology information base, resource information bank and connection relational table;
Described link control module is used for control and connects and handling failure;
The described control module of switching is used to control described cross unit signal of communication is switched to new physical resource;
Described topology information base is used to preserve the topology information of different layers network;
Described resource information bank is used to preserve the physical resource behaviour in service and the current available situation of local network element;
Described connection relational table is used to preserve relation of interdependence that different layers connects and to the operating position of physical resource;
Link control module at first is positioned at operation on a certain level when control connects, and level of living in is different to use different modes to be operatively connected according to connecting:
If operation is that the connection of lowermost layer then link control module are directly determined the path that connects according to the topology information of network; Determine to connect to use which physical resource according to resource information bank then, and notice switching control module controls cross unit switches to signal of communication on the physical resource of selection;
If operation be not that lowermost layer connects whether link control module is at first searched in connection relational table and is existed suitable lower level to connect to set up this connection; If have suitable connection then directly connect and set up new connection according to this; If there is no suitable connection is then at first set up the lower level that satisfies condition and is connected in lower network layer; In the connection of being set up, distribute the connection that effective resource is set up to be needed then.
Preferably, described link control module is used for determining the new path that connects and the physical resource of use when control connection is set up process, when handling failure according to the action that alarm produces faulty indication or decision rebulids connection according to faulty indication of delivery unit.
Method of the present invention comprises following treatment step:
(1) alarm that produces by checkout equipment of described cross unit is judged and whether is connected fault, and the connection of fault is produced indicating fault;
(2) the switch end of described faulty indication along the sequence delivery that connects to connection;
(3) described control unit control receives that the end of switching of faulty indication rebulids connection.
Preferably, the generation faulty indication in the described step (1) specifically comprises following process: at first find the connection of affected minimum one deck after detecting equipment alarm; All connections with carrying on it are connected with this and are self-marked as fault then, connect generation faulty indication with all that shield carrying it on; At last this is connected the faulty indication that produces a local lowermost layer; Applied hierarchical link when the wherein connection that is connected to the generation fault of faulty indication appointment, the level of faulty indication appointment are switched end for sending faulty indication to a target.
Preferably, describedly specifically comprise following process along the sequence delivery faulty indication that connects: the assumed fault indication be connected to C1.Simultaneously, suppose that the level in the switching terminal fault appointment of processing is m, the residing level of C1 is n; Indicating fault at first is sent to the switching terminal of the connection C2 of bearer connection C1 on the m layer; If indicating fault in the switching terminal conductively-closed that connects C2, then connects the switching terminal record trouble information of C2 and stops the transmission of indicating fault; If indicating fault does not have conductively-closed in the switching terminal that connects C2 then it is sent to the switching terminal that more upstream its m layer of carrying that connects C1 connects C3; If fail in process of transmitting, then the hierachy number m with the indicating fault appointment adds the process of transmitting of 1 rear continuation front until transmission success or m equal n; Send failure if m has equaled n, then further judge whether also carry other connection on the indicated connection C1; Also carry other on the C1 and connect then produce indicating fault for its n+1 layer that carries connects if connect, and finish new transmission and attempt; Wherein the level of new indicating fault appointment is n+1; Do not carry other connection on the C1 then declaration recovery failure if connect; The switching terminal that wherein connects refers to the end points that connects, is to set up to substitute starting point and the terminal point that connects; Its middle and upper reaches refer to the direction of the relative fault detecting point of purpose switching terminal.
Preferably, the described switching terminal of receiving indicating fault rebulids connection and specifically comprises following process: at first failure judgement indicates whether conductively-closed; If indicating fault conductively-closed then do not do any action; At first judgement does not receive whether the switching terminal of indicating fault also is the switching terminal of C1 if indicating fault has conductively-closed; If receiving the switching terminal of indicating fault is the switching terminal of C1 then rebulids C1 and all connections of upper carrying; If receive the switching terminal of indicating fault be not the switching terminal of C1 at first shield C1 and carrying thereof all connect, send then the indicating fault received to the switching terminal of upstream; Failure takes place in the process of connection then further judge whether also carry other connection on the indicated connection C1 if rebulid; Also carry other on the C1 and connect then be that the connection of the n+1 layer that carries produces indicating fault if connect, and send to corresponding switching terminal and finish new trial; Wherein the level of new indicating fault appointment is n+1; Do not carry other connection on the C1 then declaration recovery failure if connect; In the process that rebulids a low layer connection, do not change the bearing relation of connection.
Core of the present invention is the foundation again that all recovery process is described as abstract connection.The at first connection of definition different levels in network is finished recovery process on the connection basis of different levels then.What is called is connected and refers to a Transfer pipe herein, it according to the user to the abstract formation of the understanding of network.Each connection has represented a series of set that network element transmits the network element physical resource to purpose that transmit from the source, and this is gathered by professional form of expression definition, rather than defines by the form of expression of resource.Set up on the basis that is connected the lower level physical network of lower level, have bigger bandwidth granularity.Being connected on the higher level physical network basis of higher level set up, and has less bandwidth granularity.Require the high-rise basis that is connected the low layer connection to set up in the process that connects, recovery process is preferentially finished on the basis that low layer connects.The process of recovering is exactly the process that rebulids that connects.
Recovery device among the present invention is connected with method and is considered the problem recovered with abstract connection, and it has more following effects:
(1) is easy to realize.The process that rebulids that recovery process just connects in the present invention.Do not need to be concerned about the details of network in the process of recovering, they have been hidden in and have connected in the process of setting up.Just can accomplish smooth upgrade in the existing framework increase controlling mechanism of the present invention of setting up that connects.
(2) the present invention preferentially rebulids on the basis that lower level connects, and can guarantee to have faster resume speed when the network layer of fault effects hangs down.
(3) the present invention can effectively coordinate the recovery between the multitiered network in the process of recovering, and can guarantee only the layer network that breaks down to be recovered separately.
These characteristics is so that the present invention is fit to optical-fiber network of future generation more.
Description of drawings
Fig. 1 is based on the structural representation of the recovery device that connects in the optical-fiber network of the present invention;
Fig. 2 is that the network model of the embodiment of the invention is set up schematic diagram with being connected;
Fig. 3 is the process chart that control unit of the present invention receives alarm;
Fig. 4 is the process chart that control unit of the present invention receives faulty indication;
Fig. 5 is the typical signaling procedure schematic diagram that fault message transmits in the recovery process of the present invention.
Embodiment
The present invention can not only be used for the WDM network in being applicable to that light transmits, and can also be applied in the SDH network.Essential change takes place in the mode that can not cause because the network of using is different implementing when they are applied in a certain concrete network.In order to simplify the description to the invention process process, the embodiment that the present invention uses is described with reference to the accompanying drawings below in the WDM net:
Fig. 1 has described in the light WDM network and has implemented structural representation based on the recovery device that connects.This device comprises a control module 11 and a cross unit 12.Control module is used for control and sets up, discharges and the connection that is connected the heterogeneous networks level.Cross unit is used for finishing the switching action of signal transmission and produces alarm.
Wherein control unit comprises a link control module, switches control module for one, a topology information base, a resource information bank and a connection relational table.Link control module is used for control and connects and handling failure.Switching control module is used for using the change notification cross unit of resource situation that signal of communication is switched to new physical resource according to connecting.Topology information base is used to preserve the topology information of different layers network.Resource information bank is used to preserve the physical resource behaviour in service and the current available situation of local network element.Connection relational table be used for to be preserved relation of interdependence that different levels connect and to the operating position of physical resource.More than these functional units on a disposable plates with disposal ability and data storage capacities, finish.
Cross unit comprises a series of input ports, a series of output port and Cross module (it and existing transfer equipment in full accord).Input port and output port are optical port in this realization example, and optical fiber direct and outside the equipment links to each other.The corresponding optical fiber of an input (or output) port comprises some wavelength channels (as shown in Figure 1) in the optical fiber.The signal that Cross module is used for that certain wavelength channel on the input optical fibre is entered switches to another wavelength channel of output optical fibre through cross unit.The monitoring and controlling channels that cross unit is monitored optical fiber link simultaneously produces the optical fiber link alarm, and the signal of monitoring wavelength channel produces the wavelength channel alarm.All these form a light intersection equipment.
Characteristics according to service implementation and WDM network gather the optical fiber link in the network as a network layer---optical fiber layer network, and the wavelength channel set in the network is as a network layer---wavelength layer network.Corresponding will the connection also is divided into the optical fiber layer connection and is connected with wavelength layer.Wherein optical fiber layer connects the physical resource that a certain source of representative network element switched by optical fiber and support optical fiber to the purpose network element and constitutes; Wavelength layer connects the physical resource of representing a certain source network element to be switched by wavelength and support wavelength to the purpose network element and constitutes.The situation that the topology situation that the record optical fiber link consists of in topology information base and optical fiber layer connect.Optical fiber in resource information bank in the record network, wavelength and the resource of intersecting.Source node, destination node, upstream node, downstream node, switching node and wavelength layer that the record optical fiber layer connects in connection relational table, wavelength layer connects connect the operating position that optical fiber layer is connected.
If being optical fiber layer, the connection of operation connects then link control module is directly determined the path that connects according to the topology information of optical fiber layer link.Determine to connect to use which optical fiber link according to resource information bank then, and by switching control module controls cross unit signal of communication is switched on the optical fiber link of selection.
If being wavelength layer, the connection of operation connects then whether link control module is at first searched in connection relational table and existed suitable optical fiber layer to connect to set up this connection.Set up new connection if exist suitable optical fiber layer to connect then directly connect by optical fiber layer.If there is no suitable optical fiber layer connects the optical fiber layer that model then satisfies condition and connects.In connecting, distribute the optical fiber layer of setting up effective resource to set up this connection then.Whether exist suitable optical fiber layer to connect finishes according to following rule.
If operation is the connection of optical fiber layer then the route that directly connects according to the information calculations in the topology information base in the route computational process that connects.Route is calculated and is used conventional route computing method, for example dijkstra's algorithm.Require consistent optical fiber layer to connect if whether the connection of operation is the connection of wavelength layer then at first search exists to recovering, select then one or
Many end to end and need the optical fiber layer of Least-cost to connect from the source to the purpose network element.If existing such optical fiber layer to connect and wherein also having remaining wavelength channel not to be used just uses the route of this optical fiber layer connection as the new route that connects.If there is no such connection is then set up earlier one and is had the identical optical fiber layer of source and destination and connect the route that the route that then this optical fiber layer is connected connects as required wavelength layer.
In order to guarantee that the best switches effect, use optical fiber layer to connect the intermediate NE that the wavelength layer of setting up is connected access path and only use switching of optical fiber level, only finish wavelength level and switch at the entrance and exit place that connects.Like this, the use relation that the intermediate NE that connects in the process of using optical fiber layer to connect to set up wavelength layer to connect only writes down between connection gets final product, and does not need to finish resource allocation and switches control.
Fig. 2 has described above-mentioned simple optical network that constitutes based on the recovery device (abbreviating network element as) that connects and the connection situation wherein used.Each circular ringlet represents a network element in the drawings, and each bar straight line represents an optical fiber link between network element.One co-exists in 12 network elements (A, B, C, D, E, F, G, H, I, J, K, L) in this network, and 19 optical fiber links (＜A, B 〉,＜A, G 〉,＜A, H 〉,＜A, L 〉,＜B, H 〉,＜C, D 〉,＜C, H 〉,＜C, K 〉,＜D, E 〉,＜E, F 〉,＜E, K 〉,＜F, G 〉,＜F, H 〉,＜F, K 〉,＜F, L 〉,＜G, H 〉,＜H, I 〉,＜I, J 〉,＜J, K 〉).Having set up three optical fiber layers in this network connects (connect 1, connect 2, connect 3) and is connected a wavelength layer connection (connecting 4).Every optical fiber layer connection is all by some optical fiber links carryings, and they take all bandwidth of these optical fiber links.Wherein connect 1 through link＜A, H〉and network element A, H, the A end is entrance, the H end is outlet.Connect 2 through link＜H, I 〉,＜I, J 〉,＜J, K〉and network element H, I, J, K, the H end is inlet, the K end is outlet.Connect 3 process＜E, K〉and network element E, K, the K end is entrance, the E end is outlet.Wavelength layer connect to use the connection of optical fiber layer to set up and forms, and it has taken the bandwidth that optical fiber layer connects a wavelength in the optical fiber link that uses.Connect 4 and passed through connection 1, connection 2, connection 3 and network element A, H, I, J, K, E, the A end is for entering the mouth, and it is outlet that E holds.
Processing procedure when Fig. 3 has described the alarm that control unit receives that cross unit produces.After receiving alarm, at first find affected minimum one deck to connect.All connections (comprising this connection self) with carrying on it are labeled as fault then, and all connections of carrying produce faulty indication on it to shield.Then this is connected the faulty indication that produces a local lowermost layer.At last indicating fault is sent to the switching terminal of the lowermost layer connection of this connection of carrying.
Detect the optical fiber link alarm in the present embodiment and be used for judging whether to take place optical fiber layer connection fault.Detect the wavelength channel alarm and be used for judging whether to take place wavelength layer connection fault.At first whether failure judgement has influence on the optical fiber layer connection after control unit receives alarm.Be fault with the wavelength layer linkage flag of itself and upper carrying thereof then if optical fiber layer connects influenced, connect with the shielding wavelength layer and produce indicating fault.Then this optical fiber layer is connected optical fiber layer indicating fault of generation, and indicating fault is sent to the switching terminal of this connection.If only have wavelength layer to connect influenced then only be fault and the indicating fault that produces an optical fiber layer with this linkage flag.Then indicating fault is sent to the switching terminal of the optical fiber layer connection of this connection of carrying.The upstream arrival end that connects in the present embodiment is defined as the main switching terminal of connection, control module must start the process that rebulids that connects at the entrance that connects, and the outlet of connection cooperates and finish and switch (present embodiment describe later switching terminal refer to main switching terminal when not specifying).
Fig. 4 has described the processing procedure after control unit is received faulty indication.Suppose the faulty indication received indicated be connected to C1, be m at the level of handling of seeing the faulty indication appointment on the end of switching, the residing level of C1 is n.Control unit is at first judged the whether conductively-closed of the faulty indication received.If further action is no longer done in indicating fault conductively-closed then only record new fault message.At first shielding does not connect C1 and upper connection of carrying thereof if indicating fault has conductively-closed.Judge then and receive whether the end of switching of faulty indication also is the end of switching of C1.If receive that the end of switching of faulty indication is switching end then rebuliding C1 and all connections of carrying of C1.If receive that the end of switching of faulty indication is not switching end then sending the switch end of faulty indication to the upstream of C1.Failure takes place in the process of connection then further judge whether also carry other connection on the indicated connection C1 if rebulid.Also carry other on the C1 and connect then be that the connection of the n+1 layer that carries produces indicating fault if connect, and send to corresponding switching terminal and finish new trial.Wherein the level of new indicating fault appointment is n+1.If connect and not carry other on the C1 and connect then illustrate that the source end lost efficacy, declaration recovers failure.
Indicating fault is sent to the more switching terminal of the m layer connection of upstream bearer connection C1 in the process that sends indicating fault.If in process of transmitting, fail, then indicating fault is sent to the more switching terminal of the m+1 layer connection of upstream bearer connection C1, simultaneously with m=m+1.Send failure if m has equaled n, then further judge whether also carry other connection on the indicated connection C1.Also carry other on the C1 and connect then produce faulty indication if connect, and finish new transmission and attempt for n+1 layer that it carried connects.Wherein the level of new indicating fault appointment is n+1.If connect and not carry other on the C1 and connect then illustrate that the source end lost efficacy, declaration recovers failure.
Whether whether conductively-closed has been changed to fault according to indicated connection to faulty indication judges.Generally, after network breaks down, fault more the network element in downstream detect time of fault can be longer, it is also longer to be delivered to the time of switching the required cost of end.Can think fully connection indicating fault that the wavelength channel alarm produces can be than the indicating fault that optical fiber link alarm produces the late connection entrance that arrives the fault upstream.For the recovery action that high level is connected produces more effective shielding, after receiving the faulty indication that wavelength layer connects, network element also needs to do certain delay in this realization example.If in time of delay, receive another faulty indication that optical fiber layer that the indicated wavelength layer of carrying connects connects then think the faulty indication conductively-closed that wavelength layer connects.If do not receive that in time delay corresponding optical fiber layer connects indicating fault and illustrates that this indicating fault does not have conductively-closed.Set delay is the line delay that failure indication information transmits.At once will indicated connection after network element receives the indicating fault that optical fiber layer connects and the wavelength layer connection of upper carrying be set to fault.So just the wavelength layer to carrying on it has been connected to form shielding.
Fig. 5 has described according to the network among Fig. 2 and the connection situation rear fault message that is connected to break down and has been delivered to several typical signaling procedure that connects entrance.Signaling is to initiate network element, to connect the level of label and indicating fault appointment as sign among the figure.For example network element F is expressed as " signaling F2-1 " to connecting the 2 optical fiber layer faulty indication that send.Only there is the network element of the alarm of detecting to produce indicating fault among the figure.Alarm only can be detected at the optical fiber link tail end of fault for optical fiber link.Alarm only can be detected at the wavelength channel tail end of fault for wavelength channel.
Fig. 5 (a) has described the situation that the optical fiber link fault takes place between network element K and E.This link failure not only has influence on connection 3 and also has influence on connection 4.The alarm that network element E can not only detect optical fiber link can also detect the wavelength channel alarm.After network element E detects the optical fiber link alarm, produce to connect 3 indicating fault, and will connect 3 and 4 and be set to fault.After network element E detects the wavelength channel alarm owing to will do not done any action by the optical fiber link fault masking.Last network element E will connect 3 indicating fault and send to entrance network element K.So when network element K receives the continuation transmission that the entrance of finding to have arrived connection after connecting 3 indicating fault stops signaling, start simultaneously and switch (finish connect 3 and be connected 4 switch, dotted line has been described the path of switching of connection among Fig. 2).
Fig. 5 (b) has described the situation that the optical fiber link fault takes place between network element I and the J.This link failure not only has influence on connection 2 and also has influence on connection 4.After network element J detects the optical fiber link alarm, it at first will connect 2 and connect 2 indicating fault with being connected all to be set to fault and to send to the entrance network element H that connects 2.Network element E also can detect the wavelength channel alarm simultaneously, and it will produce the indicating fault that connects 4 and the indicating fault that sends connection 4 to the entrance of the connection 3 of carrying it.The rear discovery of alarm indication that network element K receives connection 4 does not have conductively-closed, and it will carry to the upstream that connects 4 the entrance transmission indicating fault of its connection 2.So when network element H receives the continuation transmission that the entrance of finding to have arrived connection after connecting 2 indicating fault stops signaling, start simultaneously and switch (finish connect 2 and be connected 4 switch, dotted line has been described the path of switching of connection among Fig. 2).To find to be shielded from after connecting 4 indicating fault be the continuation transmission that stops signaling when network element H receives.
Fig. 5 (c) has described the situation that the optical fiber link fault takes place between network element A and the H.This link failure not only has influence on connection 1 and also has influence on connection 4.After network element H detects the optical fiber link alarm, it at first will connect 1 and connect 1 indicating fault with being connected all to be set to fault and to send to the entrance A that connects 1.Network element E also can detect the wavelength channel alarm simultaneously, and it will produce the indicating fault that connects 4 and the indicating fault that sends connection 4 to the entrance of the connection 3 of carrying it.Find to connect 4 conductively-closeds after connecting 4 indicating fault and will can not produce any action when network element H receives.The rear discovery of alarm indication that network element K receives connection 4 does not have conductively-closed, and it will carry to the upstream that connects 4 the entrance transmission indicating fault of its connection 2.So when network element A receives the continuation transmission that the entrance of finding to have arrived connection after connecting 1 indicating fault stops signaling, start simultaneously and switch (finish connect 1 and be connected 4 switch, dotted line has been described the path of switching of connection among Fig. 2).
Fig. 5 (d) has described the situation that the wavelength channel fault takes place between network element H and the I.This fault only has influence on and connects 4.Only have network element E can detect the wavelength channel alarm, it will produce the indicating fault that connects 4 and the indicating fault that sends connection 4 to its upstream.Network element K, H are the intermediate NEs of fault indication process, and they find not have conductively-closed after receiving and connecting indicating fault, so indicating fault is continued to transmit to the upstream that connects.So when network element A receives the continuation transmission that the entrance of finding to have arrived connection after connecting 4 indicating fault stops signaling, start simultaneously and switch (finish connect 4 switch, dotted line has been described the path of switching that connects among Fig. 2).
Fig. 5 (e) has described the situation of network element K generation node failure.This link failure not only has influence on connection 3 and also has influence on connection 4.After network element E detects the optical fiber link alarm, it at first will connect 3 and connect 3 indicating fault with being connected all to be set to fault and to send to the entrance network element K that connects 3.Because network element K lost efficacy, when network element E produces failure when sending the indicating fault of connection 3.So network element E for connecting the faulty indication of 4 generation wavelength layers, directly sends to network element A again.So when network element A receives the continuation transmission that the entrance of finding to have arrived connection after connecting 4 indicating fault stops signaling, start simultaneously and switch (finish connect 4 switch, dotted line has been described the path of switching that connects among Fig. 2).
Describe above a kind of realization example that network is divided into optical fiber layer and channel layer, network is connected level divides the mode that can also adopt other with connection.The present invention is divided into SDH multiplexing section and VC channel layer for network and is divided into the WDM layer and the SDH layer is equally suitable in addition.All are similarly realized all within the scope of the present invention.
Claims (7)
1, in a kind of optical-fiber network based on the recovery device that connects, it is characterized in that this device is connected on each network element device in the optical-fiber network, this device comprises: a control unit and a cross unit; Control unit is used to set up, discharge and reconfigure being connected of different levels; Export in another passage of the output port that the signal cross that cross unit is used for a certain passage that input port is received is selected to control unit, and the state of signal reports to described control unit to produce alarm in the monitoring channel; Wherein, described control unit comprises: link control module, switch control module, topology information base, resource information bank and connection relational table;
Described link control module is used for control and connects and handling failure;
The described control module of switching is used to control described cross unit signal of communication is switched to new physical resource;
Described topology information base is used to preserve the topology information of different layers network;
Described resource information bank is used to preserve the physical resource behaviour in service and the current available situation of local network element;
Described connection relational table is used to preserve relation of interdependence that different layers connects and to the operating position of physical resource;
Link control module at first is positioned at operation on a certain level when control connects, and level of living in is different to use different modes to be operatively connected according to connecting:
If operation is that the connection of lowermost layer then link control module are directly determined the path that connects according to the topology information of network; Determine to connect to use which physical resource according to resource information bank then, and notice switching control module controls cross unit switches to signal of communication on the physical resource of selection;
If operation be not that lowermost layer connects whether link control module is at first searched in connection relational table and is existed suitable lower level to connect to set up this connection; If have suitable connection then directly connect and set up new connection according to this;
If there is no the lower level connection that satisfies condition is then at first set up in suitable connection in lower network layer; The resource of allocative efficiency is set up the connection that needs in the connection of setting up then.
2, device as claimed in claim 1, it is characterized in that, described cross unit comprises a series of input ports, a series of output port and a Cross module, and the signal that this Cross module is used for that certain wavelength channel on the input port is entered switches to another wavelength channel of output port through Cross module; The monitoring and controlling channels that Cross module is monitored optical link simultaneously produces the signal generation wavelength channel alarm that wavelength channel was alarmed and monitored to optical link.
3, device as claimed in claim 2, it is characterized in that, described link control module is used for determining the new path that connects and the physical resource of use when control connection is set up process, when handling failure according to the action that alarm produces faulty indication or decision rebulids connection according to faulty indication of delivery unit.
4, the connection restoration methods of installing according to claim 1 is characterized in that described method comprises following treatment step:
(1) alarm that produces by checkout equipment of described cross unit is judged and whether is connected fault, and the connection of fault is produced indicating fault;
(2) the switch end of described faulty indication along the sequence delivery that connects to connection;
(3) described control unit control receives that the end of switching of faulty indication rebulids connection.
5, method as claimed in claim 4 is characterized in that, the generation faulty indication in the described step (1) specifically comprises following process: at first find the connection of affected minimum one deck after detecting equipment alarm; All connections with carrying on it are connected with this and are self-marked as fault then, connect generation faulty indication with all that shield carrying it on; At last this is connected the faulty indication that produces a local lowermost layer; Applied hierarchical link when the wherein connection that is connected to the generation fault of faulty indication appointment, the level of faulty indication appointment are switched end for sending faulty indication to a target.
6, as claim 4 or 5 described methods, it is characterized in that, describedly specifically comprise following process along the sequence delivery faulty indication that connects: the assumed fault indication be connected to C1.Simultaneously, suppose that the level in the switching terminal fault appointment of processing is m, the residing level of C1 is n; Indicating fault at first is sent to the switching terminal of the connection C2 of bearer connection C1 on the m layer; If indicating fault in the switching terminal conductively-closed that connects C2, then connects the switching terminal record trouble information of C2 and stops the transmission of indicating fault; If indicating fault does not have conductively-closed in the switching terminal that connects C2 then it is sent to the switching terminal that more upstream its m layer of carrying that connects C1 connects C3; If fail in process of transmitting, then the hierachy number m with the indicating fault appointment adds the process of transmitting of 1 rear continuation front until transmission success or m equal n; Send failure if m has equaled n, then further judge whether also carry other connection on the indicated connection C1; Also carry other on the C1 and connect then produce indicating fault for its n+1 layer that carries connects if connect, and finish new transmission and attempt; Wherein the level of new indicating fault appointment is n+1; Do not carry other connection on the C1 then declaration recovery failure if connect; The switching terminal that wherein connects refers to the end points that connects, is to set up to substitute starting point and the terminal point that connects; Its middle and upper reaches refer to the direction of the relative fault detecting point of purpose switching terminal.
7, method as claimed in claim 6 is characterized in that, the described switching terminal of receiving indicating fault rebulids connection and specifically comprises following process: at first failure judgement indicates whether conductively-closed; If indicating fault conductively-closed then do not do any action; At first judgement does not receive whether the switching terminal of indicating fault also is the switching terminal of C1 if indicating fault has conductively-closed; If receiving the switching terminal of indicating fault is the switching terminal of C1 then rebulids C1 and all connections of upper carrying; If receive the switching terminal of indicating fault be not the switching terminal of C1 at first shield C1 and carrying thereof all connect, send then the indicating fault received to the switching terminal of upstream; Failure takes place in the process of connection then further judge whether also carry other connection on the indicated connection C1 if rebulid; Also carry other on the C1 and connect then be that the connection of the n+1 layer that carries produces indicating fault if connect, and send to corresponding switching terminal and finish new trial; Wherein the level of new indicating fault appointment is n+1; Do not carry other connection on the C1 then declaration recovery failure if connect; In the process that rebulids a low layer connection, do not change the bearing relation of connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100546055A CN100574208C (en) | 2004-07-22 | 2004-07-22 | In the optical-fiber network based on the restoration methods and the device that connect |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100546055A CN100574208C (en) | 2004-07-22 | 2004-07-22 | In the optical-fiber network based on the restoration methods and the device that connect |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1725700A CN1725700A (en) | 2006-01-25 |
| CN100574208C true CN100574208C (en) | 2009-12-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100546055A Expired - Fee Related CN100574208C (en) | 2004-07-22 | 2004-07-22 | In the optical-fiber network based on the restoration methods and the device that connect |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100574208C (en) |
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2004
- 2004-07-22 CN CNB2004100546055A patent/CN100574208C/en not_active Expired - Fee Related
Non-Patent Citations (2)
| Title |
|---|
| MPLS宽带网络互联技术. 石晶林，丁炜,404-405,人民邮电出版社. 2001 |
| MPLS宽带网络互联技术. 石晶林，丁炜，404-405，人民邮电出版社. 2001 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1725700A (en) | 2006-01-25 |
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