CN101917225A - Method for realizing inter-disc STM-1 interface automatic protection switching in gigabit-capable passive optical network (GPON) system - Google Patents
Method for realizing inter-disc STM-1 interface automatic protection switching in gigabit-capable passive optical network (GPON) system Download PDFInfo
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Abstract
The invention relates to a method for realizing inter-disc STM-1 interface automatic protection switching in a gigabit-capable passive optical network (GPON) system. The method comprises the following steps that: 1, an inter-disc optical line automatic protection switching function is initiated, and two STM-1 interface discs are appointed as master and backup discs respectively; 2, E1 service links are set up in the two STM-1 interface discs, wherein only the master disc carries corresponding E1 services; 3, the master and backup discs directly send Ethernet double-layered packets to each other to intercommunicate about respective states; 4, when the master disc fails, a switching operation instruction is sent in the form of the Ethernet double-layered packets to the backup disc, and the backup disc is switched into the master disc to carry the corresponding E1 services; and 5, the master and backup discs report the changed states to a network manager. According to the method of the invention, the master and backup states of the STM-1 interface discs are switched by directly sending the double-layered packets, so that the operation efficiency of the system is improved, the time delay in switching is reduced, furthermore, the high real-time requirement on time division multiplex (TDM) services is met, and the reliability of equipment and the degree of satisfaction of telecommunication operators and users are improved.
Description
Technical field
The present invention relates to the service protection switching technique of the inside of GPON system in the communications field, is the implementation method of STM-1 interface automatic protection switching between the mid-game of a kind of GPON system specifically.The STM-1 interface is used for transmitting the E1 business between the mid-game of described GPON system.
Background technology
GPON (Gigabit-Capable Passive Optical Networks) technology is the broadband access technology of a new generation, and the GPON system connects a plurality of optical network unit ONU (Optical Networks Unit) by optical line terminal OLT (optical line terminal) by optical distribution network ODN (Optical Distribution Network).The GPON system not only can provide Ethernet data business, voice, IPTV (Internet Protocol Television, Web TV) business at a high speed, and traditional E1 business can be provided, accomplish can with the fusion of old narrow band access net.
Described E1 business generally is used for big customer's access, in bank returns with the base station of moving large-scale application is arranged all, and just the reliability requirement to the E1 business is very high for this, has higher requirement to transmitting reliable E1 business in the novel GPON system simultaneously.After great fault had taken place the E1 business, it was the current significant problem that solves of needing that the reliable protection that how can realize the E1 business in the shortest time is switched.
" inter-board protection switching method of TDM service channel in a kind of EPON system " (application number 200910136300.1) proposed a kind of in the EPON system TDM (Time Division Multiplex; time division multiplexing) method that protection is switched between professional coiling; its operation principle is: two TDM dishes of configuration in system; and to dispose them be a protection group; one in running order, and it is accepted the E1 business configuration that main control unit issues and creates the E1 service link.Another piece is in stand-by state, and it only accepts the E1 business configuration, and does not create the operation of E1 service link.Main control unit goes the state information of the active and standby TDM dish of poll, thereby determines whether switching of master and backup discs carries out.The thinking that this invention provides a good E1 service protection to switch for us, but still there is following problem in this invention:
The state information that main control unit coils by poll TDM in this invention of the one,, thus determine whether switching of master and backup discs carries out.Switching operation is just carried out the possibility that this has not only increased switching time but also has increased faulty operation under main control unit is intervened.
Accept the E1 business configuration though be equipped with dish in this invention of the 2nd,, do not create the E1 service link, just create the E1 service link, the same like this increase that can cause switching time after switching operation becomes master when carrying out.
Summary of the invention
At the defective that exists in the prior art; the object of the present invention is to provide the implementation method of STM-1 interface automatic protection switching between the mid-game of a kind of GPON system; the direct activestandby state that sends conversion STM-1 interface disc by two layers of bag; improved running efficiency of system; reduced the time delay of switching; satisfy the high real-time requirement of TDM business more, improved the reliability of equipment, improved telecom operators and user's satisfaction.
For reaching above purpose, the technical scheme that the present invention takes is:
The implementation method of STM-1 interface automatic protection switching is characterized in that between the mid-game of a kind of GPON system, may further comprise the steps:
Step 2, webmaster issues the order of identical E1 business configuration by main control unit simultaneously to two STM-1 interface discs, and two STM-1 interface discs are all created the E1 service link;
Step 2.1 after master CPU module receives the order of E1 business configuration, is opened the Ethernet GE mouth of master Switch module, creates the E1 link, and master carries corresponding E1 business;
Step 2.2 is coiled after the CPU module receives the order of E1 business configuration fully, creates the E1 link, disconnects and coils the Ethernet GE mouth of Switch module fully, is equipped with dish and does not carry corresponding E1 business;
Step 3, master and backup discs is wrapped intercommunication state separately for two layers by directly sending out Ethernet mutually, and gives webmaster with this state information report simultaneously; Wherein, be equipped with the operating state of coiling, so that master knows that can be equipped with dish carry out switching operation with the form announcement master oneself that sends two layers of bag; Master is accepted to be equipped with the two layers of bag that comprise its state information sent that coil, and master determines whether to switch order to being equipped with to coil to send according to the state that is equipped with dish when needs are switched;
Step 4, to such an extent as to go wrong when having influence on the E1 business when being in main STM-1 interface disc optical link with attitude, this STM-1 interface disc initiatively sends the switching operation order to being equipped with dish with the form of two layers of bag of Ethernet, the STM-1 interface disc that will be in standby attitude switches to the main attitude of using, accept the Ethernet bag that far-end ONU puts forward, carry corresponding E1 business;
Step 5, the state after master and backup discs will change reports webmaster.
On the basis of technique scheme, dish to the message format of two layers of bag that comprise its state information of master transmission is fully:
Destinate MAC, 6 bytes, the MAC Address of the master that send to;
Source MAC, 6 bytes are sent the MAC Address that is equipped with dish of two layers of bag;
Ether Type, 2 bytes, network type;
Slot number, 1 byte is equipped with the backboard slot number that coils;
State information, 1 byte, state information byte are represented to coil fully during for 0XFF working properly, can carry out switching operation; The state information byte represents that dish work is undesired fully during for 0X00, can not carry out switching operation;
Reserve bytes, 48 bytes are not used temporarily.
On the basis of technique scheme, master to the message format of the two layers of bag that comprise the switching operation order that are equipped with the dish transmission is:
Destinate MAC, 6 bytes, the MAC Address that is equipped with dish that send to;
Source MAC, 6 bytes are sent the MAC Address of the master of two layers of bag;
Ether Type, 2 bytes, network type;
Slot number, 1 byte is equipped with the backboard slot number that coils;
Switching operation, 1 byte, switching operation byte are that 0x55 indication is equipped with dish and carries out switching operation;
Reserve bytes, 48 bytes are not used temporarily.
On the basis of technique scheme, two light crossings that operate in two STM-1 interface discs in the GPON system are arranged to concurrent, send signal simultaneously;
Described STM-1 interface disc comprises: SDH module, CES module, Switch module, CPU module; Wherein:
The SDH module is finished the branch multiple connection of 155.52Mbit/s to 63 E1 business, and finishes STM-1 optical interface alarm detection, and described optical interface alarm is as the trigger condition of masterslave switchover;
The CES module is finished the Circuit Emulation Service of E1 business, finishes the mutual conversion between PCM data and Ethernet data;
The Switch module is finished the exchange of Ethernet data;
The CPU module is the control module of whole single-deck, finishes the transmitting-receiving and the parsing of switching order.
On the basis of technique scheme, if the SDH module detects optical link the optical interface alarm is arranged, then produce to the CPU module and interrupt by interrupt line INT, the CPU module is immediately by Ethernet FE mouth and Switch module communication, and order is switched to being equipped with the dish transmission, while linkdown Ethernet GE mouth in the upper united mouth of process Switch module;
Be equipped with dish and receive and switch after the order Ethernet GE mouth of linkupSwitch module immediately, will oneself become master and change information, inform main control unit generation masterslave switchover incident to the webmaster advertised states.
The implementation method of STM-1 interface automatic protection switching between the mid-game of GPON of the present invention system has the following advantages:
1, improves the reliability of equipment, improved telecom operators and user's satisfaction.
2, directly by the activestandby state that sends conversion STM-1 interface disc of two layers of bag, improve running efficiency of system, reduced the time delay of switching, satisfied the high real-time requirement of TDM business more.
3, the operation of equipment, the ability of maintenance and management have been strengthened.
Description of drawings
The present invention has following accompanying drawing:
Fig. 1 system model block diagram,
Fig. 2 STM-1 interface disc theory diagram,
Flow chart is switched in protection between Fig. 3 STM-1 interface disc,
Two layers of packet voice form of Fig. 4 state information,
Fig. 5 switches two layers of packet voice form.
Embodiment
Below in conjunction with accompanying drawing the present invention is described in further detail.
Fig. 1 is the Optical Line Protection exchanging system model framework chart of STM-1 interface between the GPON system mid-game that provides of the present invention, and as shown in Figure 1, described GPON system adopts the access module of point to multiple spot, and local side inserts a plurality of far-end ONU.For the transmission of E1 business, can be with the professional tandem of E1 of the single E1 interface of the dispersion of the different ONU of far-end two STM-1 interfaces to the active and standby STM-1 interface disc of local side, two STM-1 interfaces on the active and standby STM-1 interface disc of local side can be protected each other.
Described E1 business all is to transmit by the form of Ethernet bag in the GPON internal system.Below illustrate respectively the E1 business up, descending process:
E1 business up, ONU converts the E1 business GPON OLT of Ethernet data to local side to by the function of circuit simulation, GPON OLT by backboard through being transferred to the upper united mouth of STM-1 interface disc among Fig. 2 after the exchange of main control unit, by Switch module (Switching Module) Ethernet GE (gigabit Ethernet mouth) mouthful arrives CES (circuit simulation) module again, the CES module is reduced into tdm data with Ethernet data again, becomes the light mouth packet of a STM-1 to send the data multiplexing of 63 (STM-1 can only carry 63 E1) E1 by SDH (Synchronous Digital Hierarchy) module again.
E1 business descending with up opposite, no longer described in detail.
Principle according to the Ethernet exchange; if directly adopting the shutoff of control STM-1 interface is Optical Line Protection switch function between can not the realization dish; even because turn-offed main STM-1 interface with the STM-1 interface disc; the Ethernet data of coming from GPON OLT still can exchange to the main STM-1 interface disc of using by main control unit; thereby cause the E1 service disconnection; can not reach the purpose of protection; in order to be implemented in the Optical Line Protection switch function of two dishes in the GPON system, can realize by opening or closing Ethernet GE mouth.
The present invention has provided the implementation method of STM-1 interface automatic protection switching between the mid-game of GPON system, and its flow chart as shown in Figure 3.Webmaster issues the order of optical link APS function between open disk and the configuration order of E1 business, and an appointment wherein STM-1 interface disc is master (scratch diskette), and other one is to be equipped with dish (standby dish).They receive the E1 business configuration from main control unit simultaneously, set up relevant E1 link, the Ethernet GE mouth on the master is by linkup (connection), and the Ethernet GE mouth on the dish is by linkdown (disconnection) fully, so, this moment have only active and standby work can carry corresponding E1 business.After the master optical link breaks down, transmission includes two layers of switching order and wraps and be equipped with dish and linkdown Ethernet GE mouth, be equipped with dish and resolve corresponding two layers of bag, the Ethernet GE mouth of this dish of linkup immediately after the coupling, set up success owing to be equipped with the link of dish, so can in the shortest time, carry the E1 business, finish the work of switching.Its step can be summarized as: step 1, and optical link APS function between open disk specifies two STM-1 interface discs respectively as master and backup discs; Step 2, two STM-1 interface discs are all created the E1 service link; Only master carries corresponding E1 business; Step 3, master and backup discs are directly sent out Ethernet two layers of bag intercommunication state separately mutually; Step 4 is sent the switching operation order to being equipped with dish with the form of two layers of bag of Ethernet when master goes wrong, and will coil fully and switch to master, carries corresponding E1 business; Step 5, the state after master and backup discs will change reports webmaster.
Divide several parts that the whole course of work of switching shown in Figure 3 is illustrated below:
Step 2, webmaster issues the order of identical E1 business configuration by main control unit simultaneously to two STM-1 interface discs, and two STM-1 interface discs are all created the E1 service link;
Step 2.1 after master CPU module receives the order of E1 business configuration, is opened the Ethernet GE mouth (the Ethernet GE mouth on the master is by linkup) of master Switch module, creates the E1 link, and master carries corresponding E1 business;
Step 2.2 is coiled after the CPU module receives the order of E1 business configuration fully, creates the E1 link, disconnects the Ethernet GE mouth that coils the Switch module fully (be equipped with on the dish Ethernet GE mouth by linkdown), is equipped with dish and does not carry corresponding E1 business;
Step 3, master and backup discs is wrapped intercommunication state separately for two layers by directly sending out Ethernet mutually, and gives webmaster with this state information report simultaneously; Wherein, be equipped with the operating state of coiling, so that master knows that can be equipped with dish carry out switching operation with the form announcement master oneself that sends two layers of bag; Master is accepted to be equipped with the two layers of bag that comprise its state information sent that coil, and master determines whether to switch order to being equipped with to coil to send according to the state that is equipped with dish when needs are switched;
As shown in Figure 4, being equipped with dish to the message format of two layers of bag that comprise its state information of master transmission is:
Destinate MAC, 6 bytes, the MAC Address of the master that send to;
Source MAC, 6 bytes are sent the MAC Address that is equipped with dish of two layers of bag;
Ether Type, 2 bytes, network type;
Slot number, 1 byte is equipped with the backboard slot number that coils;
State information, 1 byte, state information byte are represented to coil fully during for 0XFF working properly, can carry out switching operation; The state information byte represents that dish work is undesired fully during for 0X00, can not carry out switching operation;
Reserve bytes, 48 bytes are not used temporarily.
Step 4, to such an extent as to go wrong when having influence on the E1 business when being in main STM-1 interface disc optical link with attitude, this STM-1 interface disc initiatively sends the switching operation order to being equipped with dish with the form of two layers of bag of Ethernet, the STM-1 interface disc that will be in standby attitude switches to the main attitude of using, accept the Ethernet bag that far-end ONU puts forward, carry corresponding E1 business;
As shown in Figure 5, master to the message format of the two layers of bag that comprise the switching operation order that are equipped with the dish transmission is:
Destinate MAC, 6 bytes, the MAC Address that is equipped with dish that send to;
Source MAC, 6 bytes are sent the MAC Address of the master of two layers of bag;
Ether Type, 2 bytes, network type;
Slot number, 1 byte is equipped with the backboard slot number that coils;
Switching operation, 1 byte, switching operation byte are that 0x55 indication is equipped with dish and carries out switching operation;
Reserve bytes, 48 bytes are not used temporarily.
Step 5, the state after master and backup discs will change reports webmaster.
The implementation method of STM-1 interface automatic protection switching operates in two STM-1 interface discs in the GPON system between the mid-game of GPON of the present invention system, and two light crossings of two STM-1 interface discs are arranged to concurrent, can send signal simultaneously.Described STM-1 interface disc comprises: SDH module, CES module, Switch module, CPU module.Wherein:
The SDH module is finished the branch multiple connection of 155.52Mbit/s to 63 E1 business, and finish STM-1 light and connect alarm detection, wherein, the optical interface alarm comprises: LOS (receiving unglazed), LOF (LOF), OOF (OOF), AIS (complete " 1 ") etc., these optical interface alarms are as the trigger condition of masterslave switchover.If the SDH module detects optical link the optical interface alarm is arranged, then produce to the CPU module and interrupt by the interrupt line INT shown in Fig. 2, the CPU module is immediately by Ethernet FE mouth and Switch module communication, and order is switched to being equipped with the dish transmission, while linkdown Ethernet GE mouth in the upper united mouth of process Switch module.Be equipped with dish and receive and switch after the order Ethernet GE mouth of linkupSwitch module immediately, will oneself become master and change information, inform main control unit generation masterslave switchover incident to the webmaster advertised states.
The CES module is finished the Circuit Emulation Service of E1 business, finishes the mutual conversion between PCM data and Ethernet data.
The Switch module is finished the exchange of Ethernet data.
The CPU module is the control module of whole single-deck, finishes the transmitting-receiving and the parsing of switching order.
Be equipped with dish and only monitor two layers of bag all the time.During two layers of bag coupling of switching as target, be equipped with dish and immediately the Ethernet GE mouth of oneself be made as the linkup state.Do not need other operation promptly can smoothly finish switch work because the E1 service link is set up already this moment.Being equipped with dish, to change own state be master, and send the notice message of a masterslave switchover to webmaster, informs the activestandby state generation conversion of this moment and the corresponding slot number of master and backup discs at this moment.This dish enters the workflow of master afterwards.
In sum, the flow process of switching that auto switching is concrete between the STM-1 interface disc is: webmaster issues the function of opening two STM-1 interface disc APSs, and one is master, and another piece is for being equipped with dish.Webmaster issues identical E1 business configuration for simultaneously two dishes.Active and standby Ethernet GE mouth is made as the linkup state, sets up corresponding E1 link.Be equipped with dish Ethernet GE mouth is made as the linkdown state, set up corresponding E1 link.When incident that need switch appears in master, can initiatively send two layers of bag to corresponding slave board, simultaneously Ethernet GE mouth is made as the linkdown state.Dish is made as the linkup state with Ethernet GE mouth after receiving and switching order fully, to the notice message of a masterslave switchover of main control unit transmission, informs activestandby state generation conversion and the corresponding slot number of master and backup discs this moment of this moment.The invention provides the implementation method of the STM-1 optical interface APS between the mid-game of a kind of GPON more fast system.Switch under the control that not be used in main control unit and carry out, directly be equipped with dish in the time of need switching and implement switching operation by the master notice, and do not have main control unit to participate in this intermediate link, master and backup discs had been set up the link of E1 business before switching simultaneously, these have all shortened switching time greatly, and the business that makes is recovered faster.
Claims (5)
1. the implementation method of STM-1 interface automatic protection switching between GPON system mid-game is characterized in that, may further comprise the steps:
Step 1, when system powered on operation, webmaster issued the order that enables the APS function by main control unit, optical link APS function between open disk, an appointment wherein STM-1 interface disc is in the main attitude of using as master, and another piece STM-1 interface disc is in standby attitude and coils as being equipped with;
Step 2, webmaster issues the order of identical E1 business configuration by main control unit simultaneously to two STM-1 interface discs, and two STM-1 interface discs are all created the E1 service link;
Step 2.1 after master CPU module receives the order of E1 business configuration, is opened the Ethernet GE mouth of master Switch module, creates the E1 link, and master carries corresponding E1 business;
Step 2.2 is coiled after the CPU module receives the order of E1 business configuration fully, creates the E1 link, disconnects and coils the Ethernet GE mouth of Switch module fully, is equipped with dish and does not carry corresponding E1 business;
Step 3, master and backup discs is wrapped intercommunication state separately for two layers by directly sending out Ethernet mutually, and gives webmaster with this state information report simultaneously; Wherein, be equipped with the operating state of coiling, so that master knows that can be equipped with dish carry out switching operation with the form announcement master oneself that sends two layers of bag; Master is accepted to be equipped with the two layers of bag that comprise its state information sent that coil, and master determines whether to switch order to being equipped with to coil to send according to the state that is equipped with dish when needs are switched;
Step 4, to such an extent as to go wrong when having influence on the E1 business when being in main STM-1 interface disc optical link with attitude, this STM-1 interface disc initiatively sends the switching operation order to being equipped with dish with the form of two layers of bag of Ethernet, the STM-1 interface disc that will be in standby attitude switches to the main attitude of using, accept the Ethernet bag that far-end ONU puts forward, carry corresponding E1 business;
Step 5, the state after master and backup discs will change reports webmaster.
2. the implementation method of STM-1 interface automatic protection switching between the mid-game of GPON as claimed in claim 1 system is characterized in that: the message format that is equipped with two layers of bag that comprise its state information that dish sends to master is:
Destinate MAC, 6 bytes, the MAC Address of the master that send to;
Source MAC, 6 bytes are sent the MAC Address that is equipped with dish of two layers of bag;
Ether Type, 2 bytes, network type;
Slot number, 1 byte is equipped with the backboard slot number that coils;
State information, 1 byte, state information byte are represented to coil fully during for 0XFF working properly, can carry out switching operation; The state information byte represents that dish work is undesired fully during for 0X00, can not carry out switching operation;
Reserve bytes, 48 bytes are not used temporarily.
3. the implementation method of STM-1 interface automatic protection switching between the mid-game of GPON as claimed in claim 1 system is characterized in that: master to the message format that is equipped with two layers of bag that comprise the switching operation order that dish sends is:
Destinate MAC, 6 bytes, the MAC Address that is equipped with dish that send to;
Source MAC, 6 bytes are sent the MAC Address of the master of two layers of bag;
Ether Type, 2 bytes, network type;
Slot number, 1 byte is equipped with the backboard slot number that coils;
Switching operation, 1 byte, switching operation byte are that 0x55 indication is equipped with dish and carries out switching operation;
Reserve bytes, 48 bytes are not used temporarily.
4. as the implementation method of STM-1 interface automatic protection switching between claim 1 or the mid-game of 2 or 3 described GPON systems, it is characterized in that: two light crossings that operate in two STM-1 interface discs in the GPON system are arranged to concurrent, send signal simultaneously;
Described STM-1 interface disc comprises: SDH module, CES module, Switch module, CPU module; Wherein:
The SDH module is finished the branch multiple connection of 155.52Mbit/s to 63 E1 business, and finishes STM-1 optical interface alarm detection, and described optical interface alarm is as the trigger condition of masterslave switchover;
The CES module is finished the Circuit Emulation Service of E1 business, finishes the mutual conversion between PCM data and Ethernet data;
The Switch module is finished the exchange of Ethernet data;
The CPU module is the control module of whole single-deck, finishes the transmitting-receiving and the parsing of switching order.
5. the implementation method of STM-1 interface automatic protection switching between the mid-game of GPON as claimed in claim 4 system, it is characterized in that: the optical interface alarm is arranged if the SDH module detects optical link, then produce to the CPU module and interrupt by interrupt line INT, the CPU module is immediately by Ethernet FE mouth and Switch module communication, and order is switched to being equipped with the dish transmission, while linkdown Ethernet GE mouth in the upper united mouth of process Switch module;
Be equipped with dish and receive and switch after the order Ethernet GE mouth of linkupSwitch module immediately, will oneself become master and change information, inform main control unit generation masterslave switchover incident to the webmaster advertised states.
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