CN1866804A - Method for carrying out fault protection inversion on main stem optical fibre of passive optical network - Google Patents
Method for carrying out fault protection inversion on main stem optical fibre of passive optical network Download PDFInfo
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- CN1866804A CN1866804A CN 200510109399 CN200510109399A CN1866804A CN 1866804 A CN1866804 A CN 1866804A CN 200510109399 CN200510109399 CN 200510109399 CN 200510109399 A CN200510109399 A CN 200510109399A CN 1866804 A CN1866804 A CN 1866804A
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Abstract
The invention discloses a PON arterial optical fibre error protection reversing method, which comprises the following steps: distance-measuring operation is carried out on primary backbone fibre-optical and standby backbone fibre-optical of PON; the gained ranging data is reserved; the business of primary backbone fibre-optical is switched on the standby backbone fibre-optical according to received ranging data, when the primary backbone fibre-optical gets out of order.
Description
Technical field
The present invention relates to communication field, relate in particular to a kind of trunk optical fiber and carry out the method that error protection is switched EPON.
Background technology
In recent years, along with the fast development of the Internet and popularizing of PC, the sharp sharp increase of data flow transmitted adds in the Internet, aggravated the capacity limit of Access Network, and traditional copper cable access way can't satisfy the demand that communication service increases in the Internet in the Access Network.Simultaneously, digital multimedia signal also more and more is subjected to people's favor, and the application such as program request, multicast and broadcasting by access network realization video or audio frequency will appear in the present and later access net system more.
Advantages such as optical fiber has transmission frequency bandwidth, capacity is big, loss is low and antijamming capability is strong are suitable as at a high speed, the transmission medium of broadband services very much.And in various smooth access technologies, PON (EPON) as a kind of now and future very promising smooth access technology, just more and more be subjected to people's attention.
PON is as a kind of broadband access optical fiber technology of emerging last kilometer of covering, adopt passive bus, it does not need to install node device at optical branch point, only needing that a simple optical branching device is installed gets final product, therefore, PON have save cable resource, bandwidth resources share, save machine room investment, device security height, lay low with operation expense, networking speed fast, comprehensively the networking cost is low and transparent and be easy to advantage such as upgrading to business.The structural representation of PON network as shown in Figure 1.
In networking shown in Figure 1, PON inserts signal from OLT (optical network line terminal), give each user side by ODN (Optical Distribution Network) with the signal allocation that inserts, such as, distribute to ONT (optic network user terminal) or ONU (optical-fiber network subscriber unit), ONT is located immediately at user side, and also has other network such as Ethernet between ONU and user.Can watch multi-media signals such as video or audio frequency by ONU at user side.
In networking shown in Figure 1, OLT is positioned at local side, and ONU/ONT is positioned at user side, and OLT is a down direction to the direction of ONU/ONT, and ONU/ONT is a up direction to the direction of OLT.At down direction, ODN is assigned to some output user sides with the light signal of OLT input by power averaging, branch prescription case such as generally have 1 minute 16,1 minutes 32 or 1 minutes 64.At up direction, the signal that each ONU/ONT sends all can arrive OLT, and OLT adopts TDMA (time division multiple access access) access mode that the data that each ONU/ONT sends are arbitrated, with the generation that avoids conflict.
In PON; this section optical fiber between OLT and the ODN is called trunk optical fiber; because; the ODN sub-district of generally being close to the users; therefore; the distance of trunk optical fiber is generally long; the reliability requirement of trunk optical fiber is very high; in actual applications, need make backup protection, promptly this master be disposed standby trunk optical fiber with trunk optical fiber it; in the prior art; also not when the master breaks down with trunk optical fiber, how to switch with trunk optical fiber protection, apace business is switched to the method on the standby trunk optical fiber main.
Summary of the invention
The purpose of this invention is to provide a kind of trunk optical fiber and carry out the method that error protection is switched, thereby can in the connecting system of PON network, lead when breaking down, switch with trunk optical fiber protection main apace with trunk optical fiber to EPON.
The objective of the invention is to be achieved through the following technical solutions:
A kind of trunk optical fiber to EPON carries out the method that error protection is switched, and comprising:
A, carry out range operation respectively on trunk optical fiber and standby trunk optical fiber, and the ranging data of acquisition is preserved at EPON main;
B, when breaking down,, switch on the standby trunk optical fiber with the business on the trunk optical fiber main according to the ranging data of described preservation with trunk optical fiber main.
Described ranging data comprises that logic arrives the round-trip delay of distance between distance or reflection optical network line terminal OLT and the optical-fiber network subscriber unit ONU/ optic network user terminal ONT.
Described steps A specifically comprises:
A1, measurement master use the logic of trunk optical fiber and standby trunk optical fiber to arrive distance, and the master who obtains is kept in OLT and the spare OLT with the logic arrival range data of trunk optical fiber and standby trunk optical fiber or the difference between their logics arrival range data;
A2, carry out range operation in real time on trunk optical fiber, the ranging data that obtains is kept at synchronously main with in OLT and the spare OLT main.
Described steps A 1 specifically comprises:
When the master restarts with OLT and spare OLT, lead the measuring operation that arrives distance with the logic of trunk optical fiber and standby trunk optical fiber.
Described steps A specifically comprises:
A3, in by the main system from OLT to ONU/ONT that constitutes with trunk optical fiber, carry out range operation main in real time on trunk optical fiber, the ranging data that obtains is kept at main with among the OLT;
In the system from OLT to ONU/ONT that constitutes by standby trunk optical fiber, on standby trunk optical fiber, carry out range operation in real time, the ranging data that obtains is kept in the spare OLT.
Described steps A specifically comprises:
A4, in by the main system from OLT to ONU/ONT that constitutes with trunk optical fiber, on leading, lead the measuring operation that arrives distance with the logic of trunk optical fiber with trunk optical fiber, and carry out range operation in real time, be kept at main logic arrival distance and the ranging data that obtains main with in OLT and the spare OLT with trunk optical fiber;
In the system from OLT to ONU/ONT that constitutes by standby trunk optical fiber, the logic of carrying out standby trunk optical fiber on standby trunk optical fiber arrives the measuring operation of distance, and carry out range operation in real time, the logic of the standby trunk optical fiber that obtains is arrived distance and ranging data is kept at main with in OLT and the spare OLT.
Described step B specifically comprises:
When the master breaks down with trunk optical fiber, according to the difference that arrives in the main logic of preserving on the spare OLT between range data or their logics arrival range data with trunk optical fiber and standby trunk optical fiber, and main ranging data with trunk optical fiber, switch on the standby trunk optical fiber with the business on the trunk optical fiber main.
Described step B specifically comprises:
When the master breaks down with trunk optical fiber, switch in the system from OLT to ONU/ONT that constitutes by standby trunk optical fiber with the business on the trunk optical fiber main.
Described step B specifically comprises:
When the master breaks down with trunk optical fiber, arrive range data and the ranging data of master according to the main logic of on spare OLT, preserving with trunk optical fiber with trunk optical fiber and standby trunk optical fiber, switch on the standby trunk optical fiber with the business on the trunk optical fiber main;
Perhaps;
According to the ranging data of on standby trunk optical fiber, carrying out range operation in real time of in spare OLT, preserving, switch in the system from OLT to ONU/ONT that constitutes by standby trunk optical fiber with the business on the trunk optical fiber main.
As seen from the above technical solution provided by the invention; the present invention can be in the connecting system of PON network; when the master breaks down with trunk optical fiber; utilize software to realize that simply, apace the master switches with the protection of trunk optical fiber fault; business is switched on the standby trunk optical fiber; thereby in the PON system, carry miscellaneous service better, particularly carry the exigent TDM of protection switch time (time division multiplexing) business, and can reach the professional carrying that does not influence the TDM business of switching.
Description of drawings
Fig. 1 is the structural representation of PON network;
Fig. 2 is the process chart of the described method of this method;
Fig. 3 switches the schematic diagram of scheme for PON trunk optical fiber simple protective of the present invention;
Fig. 4 switches the schematic diagram of scheme for PON trunk optical fiber full backup protection of the present invention;
Fig. 5 switches the schematic diagram of scheme for PON trunk optical fiber integrated protection of the present invention.
Embodiment
The invention provides a kind of trunk optical fiber and carry out the method that error protection is switched EPON; core of the present invention is: carry out range operation on leading with trunk optical fiber and standby trunk optical fiber; the ranging data that obtains is preserved; when the master breaks down with trunk optical fiber; ranging data according to preserving switches to business on the standby trunk optical fiber apace.
Describe the present invention in detail below in conjunction with accompanying drawing, the handling process of the described method of this method comprises the steps: as shown in Figure 2
Step 2-1, carry out range operation respectively on trunk optical fiber and standby trunk optical fiber, and the ranging data of acquisition is preserved main.
The present invention at first need preserve ranging data on leading with trunk optical fiber and standby trunk optical fiber, in actual applications, can take different handling processes according to the different backup protection schemes of PON trunk optical fiber.
Such as, in the simple backup protection scheme of PON trunk optical fiber shown in Figure 1, need carry out following handling process:
As shown in Figure 1, in this scheme, comprise the main OLT of using and two unit of spare OLT among the OLT, control is main with trunk optical fiber and standby trunk optical fiber respectively.At first need lead the measuring operation that arrives distance with the logic of trunk optical fiber and standby trunk optical fiber respectively on trunk optical fiber and standby trunk optical fiber, the main logic with trunk optical fiber and standby trunk optical fiber that obtains be arrived distance be kept at the master as static data and use in OLT and the spare OLT main.
In actual applications, we can carry out this operation when main spare OLT restarts, lead the measuring operation that arrives distance with the logic of trunk optical fiber and standby trunk optical fiber when promptly main spare OLT restarts respectively, the difference with the two range finding result is kept at main with in OLT and the spare OLT then.
Then, main when being in normal operating conditions, carry out range operation in real time on trunk optical fiber, the ranging data that obtains is kept at main with among the OLT time, synchronously be kept in the spare OLT main with trunk optical fiber.
Such as, switch in the schematic diagram of scheme in PON trunk optical fiber full backup protection shown in Figure 2, need carry out following handling process:
In this scheme, main independent mutually with trunk optical fiber and standby trunk optical fiber, utilize the master to constitute the autonomous system of two covers from OLT to ONU/ONT with trunk optical fiber and standby trunk optical fiber, independently control with OLT and spare OLT by main respectively.So, in actual applications, need to carry out in real time respectively range operation at two covers main in the autonomous systems on trunk optical fiber and standby trunk optical fiber, and ranging data be kept at respectively in main OLT of using and the spare OLT.In this scheme, need not carry out the simultaneous operation between the main spare OLT of ranging data.
Such as, switch in the schematic diagram of scheme at PON trunk optical fiber integrated protection shown in Figure 3, need carry out following handling process:
This scheme is the comprehensive of above-mentioned two kinds of schemes, and in this scheme, utilization is main also to have constituted two systems of cover from OLT to ONU/ONT with trunk optical fiber and standby trunk optical fiber, is controlled with OLT and spare OLT by main respectively, and only this two cover system is independent.
In actual applications, master in two cover systems is with needing to lead the measuring operation that arrives distance with the static logic of trunk optical fiber and standby trunk optical fiber respectively on trunk optical fiber and the standby trunk optical fiber, and carry out range operation respectively in real time, and the main static logic with trunk optical fiber and standby trunk optical fiber that will obtain arrives distance and ranging data is kept at main with in OLT and the spare OLT synchronously.
Step 2-2, main when breaking down with trunk optical fiber, the ranging data according to preserving switches to business on the standby trunk optical fiber apace.
Main when breaking down, at the simple backup protection scheme of above-mentioned PON trunk optical fiber with trunk optical fiber:
Can utilize above-mentioned that in spare OLT, preserve and main with the relevant ranging data of trunk optical fiber; comprising main real time distance data and the main difference that arrives distance with the logic between trunk optical fiber and the standby trunk optical fiber with OLT; business is directly switch on the standby trunk optical fiber; and need not carry out range operation again; therefore, the speed of protection switching is very fast.
Main when breaking down, at above-mentioned PON trunk optical fiber full backup protection scheme with trunk optical fiber:
Also need not carry out range operation again, need only directly business be switched in the OLT-ONU/ONT system that constitutes by standby trunk optical fiber.
Main when breaking down, at above-mentioned PON trunk optical fiber integrated protection scheme with trunk optical fiber:
Can utilize above-mentioned that in spare OLT, preserve and main with the relevant ranging data of trunk optical fiber, comprising main real time distance data and main difference, be directly switch on the standby trunk optical fiber with the business on the trunk optical fiber main with the arrival of the logic between trunk optical fiber and standby trunk optical fiber distance with OLT.
Also can utilize the above-mentioned ranging data of on standby trunk optical fiber, carrying out range operation in real time of in spare OLT, preserving, business is switched in the OLT-ONU/ONT system that constitutes by standby trunk optical fiber.
Arriving distance for the above-mentioned logic of mentioning, also can be RTT (round-trip delay).Simultaneously, one of basis of switching is exactly the difference of these data between the active and standby usefulness, so, also can each obtain active and standby arrive distance with logic in, it is good that systems soft ware is only preserved this difference.
Below only described the ranging data of outbalance in the PON system,, roughly can be divided into two classes for other data, the one, static data is mainly the business configuration data, such as VLAN, LLID (LLID) etc.The one, dynamic data is tabulated such as dynamic MAC address.Static data is by software arrangements, can accomplish between the real-time main spare OLT that synchronously, after generation was switched in protection, therefore business can not be affected.Need take certain measure for dynamic data, otherwise can influence quality of service and time of service interruption, the backup between the main spare OLT of dynamic data is synchronous, and the present invention does not describe.
The ranging data of PON system outbalance has below only been described; for other data; distribute such as LLID (LLID); also need be between main spare OLT synchronously in real time; to guarantee that protection takes place switches the professional fast quick-recovery in back; these data can be set on the spare OLT by software when being set to the main OLT of using synchronously.
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 claim.
Claims (9)
1, a kind of trunk optical fiber to EPON carries out the method that error protection is switched, and it is characterized in that, comprising:
A, carry out range operation respectively on trunk optical fiber and standby trunk optical fiber, and the ranging data of acquisition is preserved at EPON main;
B, when breaking down,, switch on the standby trunk optical fiber with the business on the trunk optical fiber main according to the ranging data of described preservation with trunk optical fiber main.
2, carry out the method that error protection is switched according to the described trunk optical fiber of claim 1 to EPON; it is characterized in that described ranging data comprises that logic arrives the round-trip delay of distance between distance or reflection optical network line terminal OLT and the optical-fiber network subscriber unit ONU/ optic network user terminal ONT.
3, carry out the method that error protection is switched according to the described trunk optical fiber of claim 1, it is characterized in that described steps A specifically comprises EPON:
A1, measurement master use the logic of trunk optical fiber and standby trunk optical fiber to arrive distance, and the master who obtains is kept in OLT and the spare OLT with the logic arrival range data of trunk optical fiber and standby trunk optical fiber or the difference between their logics arrival range data;
A2, carry out range operation in real time on trunk optical fiber, the ranging data that obtains is kept at synchronously main with in OLT and the spare OLT main.
4, carry out the method that error protection is switched according to the described trunk optical fiber of claim 3, it is characterized in that described steps A 1 specifically comprises EPON:
When the master restarts with OLT and spare OLT, lead the measuring operation that arrives distance with the logic of trunk optical fiber and standby trunk optical fiber.
5, carry out the method that error protection is switched according to the described trunk optical fiber of claim 1, it is characterized in that described steps A specifically comprises EPON:
A3, in by the main system from OLT to ONU/ONT that constitutes with trunk optical fiber, carry out range operation main in real time on trunk optical fiber, the ranging data that obtains is kept at main with among the OLT;
In the system from OLT to ONU/ONT that constitutes by standby trunk optical fiber, on standby trunk optical fiber, carry out range operation in real time, the ranging data that obtains is kept in the spare OLT.
6, carry out the method that error protection is switched according to the described trunk optical fiber of claim 1, it is characterized in that described steps A specifically comprises EPON:
A4, in by the main system from OLT to ONU/ONT that constitutes with trunk optical fiber, on leading, lead the measuring operation that arrives distance with the logic of trunk optical fiber with trunk optical fiber, and carry out range operation in real time, be kept at main logic arrival distance and the ranging data that obtains main with in OLT and the spare OLT with trunk optical fiber;
In the system from OLT to ONU/ONT that constitutes by standby trunk optical fiber, the logic of carrying out standby trunk optical fiber on standby trunk optical fiber arrives the measuring operation of distance, and carry out range operation in real time, the logic of the standby trunk optical fiber that obtains is arrived distance and ranging data is kept at main with in OLT and the spare OLT.
7, carry out the method that error protection is switched according to claim 3 or 4 described trunk optical fibers, it is characterized in that described step B specifically comprises EPON:
When the master breaks down with trunk optical fiber, according to the difference that arrives in the main logic of preserving on the spare OLT between range data or their logics arrival range data with trunk optical fiber and standby trunk optical fiber, and main ranging data with trunk optical fiber, switch on the standby trunk optical fiber with the business on the trunk optical fiber main.
8, carry out the method that error protection is switched according to the described trunk optical fiber of claim 5, it is characterized in that described step B specifically comprises EPON:
When the master breaks down with trunk optical fiber, switch in the system from OLT to ONU/ONT that constitutes by standby trunk optical fiber with the business on the trunk optical fiber main.
9, carry out the method that error protection is switched according to the described trunk optical fiber of claim 6, it is characterized in that described step B specifically comprises EPON:
When the master breaks down with trunk optical fiber, arrive range data and the ranging data of master according to the main logic of on spare OLT, preserving with trunk optical fiber with trunk optical fiber and standby trunk optical fiber, switch on the standby trunk optical fiber with the business on the trunk optical fiber main;
Perhaps;
According to the ranging data of on standby trunk optical fiber, carrying out range operation in real time of in spare OLT, preserving, switch in the system from OLT to ONU/ONT that constitutes by standby trunk optical fiber with the business on the trunk optical fiber main.
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