CN101150367A - Backup method and device for passive optical network OLT equipment - Google Patents

Abstract

This invention discloses a backing up method for passive optical network (PON) optical line terminals (OLT) including: setting up PON back-up groups, and different PON back-up groups include different PON ports, selecting a master PON port and a back-up port and backing up the information in the master port into said back-up port. This invention discloses OLT devices and makes exchange protected back up to trunk routes between OLT devices by notifying and backing up messages to avoid leading new fault points and increase stability of the system.

Description

Backup method and device for passive optical network OLT equipment

technical field

The invention relates to the field of communication technology, in particular to a backup method and equipment for passive optical network OLT equipment.

Background technique

The rise of the Internet, especially the development of multimedia services, has led to an increasing demand for bandwidth. Traditional copper cable access technology has been difficult to meet the demand for high-bandwidth access. Optical fiber-based access technology has the advantages of high bandwidth, strong long-distance transmission capability, good confidentiality, and strong anti-interference ability. It can meet the current and future business development requirements for bandwidth, and has become the main implementation technology of the access network. Among various optical fiber access technologies, PON (passive optical network) has become the preferred solution in optical access technology due to its advantages of easy maintenance, high bandwidth, and low cost. With the increase of broadband access network services, especially the networking needs of some important customers, it is very important to protect the PON system.

EPON (Ethernet PON, Ethernet Passive Optical Network) and GPON (Gigabit-capable PON, Gigabit Passive Optical Network) are the two most advantageous technologies in PON technology, and have become the first choice for operators to build FTTH (Fiber To The Home , fiber to the home), FTTB (Fiber To The Building, fiber to the building) and other optical access networks adopted by the preferred system structure. Among them, the FTTH system structure is shown in Figure 1. Network management equipment, authentication and billing equipment, and OLT (Optical Line Terminal, Optical Line Terminal) communicate through the IP MAN, and the OLT communicates with the POS (POS) of each building through the transfer box of the community center computer room. Passive Optical Splitter, passive optical splitter) connection, each POS is connected to the ONU (Optical Network Unit, Optical Network Unit) in the building through a fiber splitter box.

For the security of FTTH and other systems, the tree structure protection switching scheme of EPON and GPON came into being. The 2:N POS is used to replace the original 1:N POS for dual-fiber backup. For example, use a 1×2 optical switch at the OLT PON port to implement switching protection for the main fiber and backup fiber; use dual PON ports or dual OLT board backup at the OLT equipment, etc. These backup switching protection methods cannot protect the OLT equipment failure. catastrophic impact.

In order to solve the problem of OLT equipment failure, dual-machine backup can be performed on the OLT equipment. At present, there is already a passive optical network backbone optical fiber protection switching device that can realize dual-machine backup. The protection switching device is located between two OLT devices and the POS. On the protection switching device, the protection switching device performs active-standby switchover of the OLT and switchover of the active-standby optical fiber by judging the situation of the uplink and downlink optical signals.

However, this dual-system backup also has a serious defect: it introduces a new point of failure of the protection switching equipment. Since the protection switching device is an active device, various failures may occur during hardware and software maintenance; and due to the location of the protection switching device, once a software and hardware failure occurs, the entire access network will inevitably be unavailable.

In addition, since dozens of ONUs may be connected to a PON port, the registration and configuration of these ONU devices will place a heavy burden on the OLT device. The upgrade of the software and hardware of the OLT will take a long time, and the business cannot be operated during the upgrade.

Contents of the invention

An embodiment of the present invention provides a backup method for a passive optical network OLT device. The method includes two functions: a PON group backup mechanism and a protection switching mechanism. The PON trunk path is switched and protected and backed up between the OLT devices through notification messages and backup messages.

Wherein, the PON group backup mechanism in the backup method of the passive optical network optical line terminal OLT device is applied to a passive optical network including at least two OLT devices, and the method includes the following steps:

Establish passive optical network PON backup groups, and different PON backup groups include different PON ports;

Electing the main PON port and the standby PON port in the PON backup group;

Backing up the information of the primary PON port in the PON backup group to the backup PON port, specifically including the OLT device belonging to the primary PON port in the PON backup group sending a backup to the OLT device belonging to the backup PON port in the PON backup group message.

The election of the primary PON port and the standby PON port in the PON backup group is realized by exchanging notification messages between the local OLT device and the peer OLT device.

The election of the main PON port and the standby PON port in the PON backup group by interacting with the opposite end OLT equipment to notify the message specifically includes:

The local OLT device sends the announcement message of each PON backup group to the opposite end OLT equipment respectively, and the announcement message includes PON backup group information and priority information;

The local OLT device receives the notification message sent by the peer OLT device, compares the PON port priority information of the peer OLT device with the PON port priority information of the local OLT device, if the PON port priority information of the local OLT device is high, the local PON port in the PON backup group is the primary PON port, and the remote PON port is the standby PON port.

After the local OLT device receives the notification message sent by the opposite end OLT device, it also includes:

When the priority of the standby PON port is higher than that of the main PON port, the attribute of the PON backup group is judged. If it is a preemptive mode, the standby PON port is switched to the main PON port; if it is a non-preemptive mode, the standby PON port maintains the current state.

Before the information of the main PON port in the PON backup group is backed up to the backup PON port, it also includes:

Sending a backup request to the OLT device belonging to the backup PON port in the PON backup group through the OLT device belonging to the main PON port in the PON backup group, and receiving a backup response returned by the OLT device belonging to the backup PON port.

After the information of the main PON port in the PON backup group is backed up to the backup PON port, it also includes:

Send a backup completion message to the OLT device belonging to the standby PON port in the PON backup group through the OLT device belonging to the main PON port in the PON backup group;

Receiving the backup verification message returned by the OLT device to which the standby PON port belongs in the PON backup group, the backup verification message carries a verification value;

The check value is compared with the calculated value of the local information, if they are consistent, the backup is successful, and if not, the backup message is resent.

After the main PON port and the standby PON port in the election PON backup group, it also includes:

The OLT device to which the primary PON port belongs in the PON backup group periodically sends a notification message to the OLT device to which the standby PON port belongs.

Wherein, the protection switching mechanism in the backup method of the passive optical network optical line terminal OLT equipment includes abnormal protection switching and manual protection switching, and the abnormal protection switching process includes:

After detecting the abnormality, the OLT device of the main PON port in the PON backup group sends a switching message to the OLT device of the backup PON port in the PON backup group, stops sending notification messages, and closes the main PON port ;

The OLT device to which the standby PON port in the PON backup group belongs receives the switchover message, starts the standby PON port, and starts sending notification messages periodically;

The OLT device to which the standby PON port in the PON backup group belongs does not receive the notification message within a preset time, and switches the standby PON port to be the active PON port.

The difference between manual protection switching and the above-mentioned abnormal protection switching is that the protection switching is not triggered by abnormal detection, but is triggered by the switching command provided by the user. The specific switching process is the same and will not be repeated here.

Manual protection switching can be used for online upgrade:

All main PON ports in the OLT equipment are switched to another OLT equipment, and the OLT equipment is upgraded;

After the upgrade of the OLT device is completed, switch all the main PON ports in the other OLT device to the OLT device to upgrade the other OLT device.

The present invention also provides an OLT device, which is applied in a passive optical network including at least two OLT devices, including:

A PON backup group establishment unit is used to establish a passive optical network PON backup group, and different PON backup groups include different PON ports;

An election unit, which establishes a unit connection with the PON backup group, and is used to elect the main PON port and the standby PON port in the PON backup group, and when the priority of the main PON port is lower than that of the standby PON port, the notification message is sent The unit stops sending general notification messages. When the priority of the standby PON port is higher than that of the main PON port, if the PON backup group is in the preemption mode, the standby PON port is switched to the main PON port, and the notification message sending unit is periodically sent For general notification messages, if the mode is non-preemptive, the standby PON port maintains the current state.

A port information backup unit, connected to the election unit, for backing up the information of the primary PON port in the PON backup group to the backup PON port.

The PON port switching unit is used to send a switching message to the peer OLT device when the local OLT device finds a fault, stop sending notification messages, and close the corresponding main PON port; and receive the switching message sent by the peer OLT device When receiving a notification message, start the corresponding standby PON port and start sending notification messages periodically; or if the notification message sent by the peer OLT device is not received within the preset time, switch the corresponding standby PON port to be the main PON port.

The general notification message sending and receiving unit is used to regularly send a general notification message to the peer OLT device, and receive the general notification message sent from the peer OLT device, and when the general notification message sent by the peer OLT device is not received within a predetermined time When the message is notified, the PON port switching unit is triggered.

The port information backup unit also includes:

The backup information sending and receiving subunit is used for sending and receiving backup information;

The main-standby handshake subunit is used to send a backup request to the OLT device belonging to the standby PON port in the PON backup group through the OLT device belonging to the main PON port in the PON backup group, and receive a return from the OLT device belonging to the standby PON port. Start the port information backup unit after the backup response.

The port information backup unit also includes:

The verification subunit is used to send a backup completion message to the OLT device belonging to the standby PON port in the PON backup group through the OLT device belonging to the main PON port in the PON backup group, and receive the OLT belonging to the standby PON port in the PON backup group For the check value returned by the device, compare the check value with the calculated value of the local information. If they are consistent, the backup is successful. If they are inconsistent, the backup message is resent.

The PON port switching unit specifically includes:

An abnormality detection subunit is used for fault detection of the OLT equipment;

A switching message sending and receiving subunit is used for sending a switching message to the opposite end OLT equipment when the abnormality detection subunit detects that the local OLT equipment fails; and receiving the switching message sent by the opposite end OLT equipment;

The switching function operation subunit is used to switch the main PON port to the standby PON port when the local OLT device detects a fault; it receives the switching message sent by the opposite end OLT device, or does not receive the opposite end within a predetermined time When the OLT device sends a general notification message, the corresponding standby PON port is switched to the main PON port.

The command switching subunit is used to receive a switching command from a user, and notify the switching function operation subunit to perform the switching operation of the active and standby PON ports.

In the embodiment of the present invention, the switching protection and backup of the PON trunk path are performed between the OLT devices through the notification message and the backup message, which avoids introducing new fault points and improves the security of the system. In addition, when the system is upgraded, the backup device is upgraded first, and then the master/standby switchover is performed to upgrade the other device, so that the work and business will not be interrupted.

Description of drawings

FIG. 1 is a schematic structural diagram of an FTTH system in the prior art;

Fig. 2 is a kind of backup method flowchart of OLT equipment among the present invention;

Fig. 3 is a schematic diagram of dual-machine backup networking in the present invention;

Fig. 4 is a structural diagram of an OLT device in the present invention.

Detailed ways

The core idea of the present invention is: the same POS upstream optical fiber is connected to two PON ports of two OLT devices, and these two PON ports establish a PON backup group PBG (PON Backup Group, PON backup group), wherein the role of one port is Master (main), the other is Slave (slave). Switching protection and backup of the PON trunk path is performed between OLT devices through notification messages and backup messages, which avoids introducing new failure points and improves system stability.

Embodiment 1 of the present invention provides a backup method for a passive optical network OLT device, which is applied to a passive optical network including at least two OLT devices, as shown in FIG. 2 , including the following steps:

In step s201, a passive optical network PON backup group is established, and different PON backup groups include different PON ports.

Step s202, electing a primary PON port and a standby PON port in the PON backup group. The specific process includes: sending the announcement message of each PON backup group to the opposite end OLT equipment respectively, including PON backup group information and priority information in the announcement message; receiving the announcement message sent by the opposite end OLT equipment, comparing the Describe the PON port priority information of the peer OLT device and the PON port priority information of the local OLT device. If the PON port priority of the local OLT device is high, the local PON port in the PON backup group is the master PON port. port, and the peer PON port is the standby PON port. The active PON port in the PON backup group periodically sends a notification message to the standby PON port.

Step s203, backing up the information of the primary PON port in the PON backup group to the standby PON port. In order to ensure the reliability of the backup process, the step of master-standby handshake can be added before the port information is backed up to the standby PON port in the PON backup group: the OLT device to which the main PON port in the PON backup group belongs The OLT device to which the standby PON port belongs in the PON backup group sends a backup request, and receives a backup response returned by the OLT device to which the standby PON port belongs. After the port information is sent to the OLT device to which the standby PON port in the PON backup group belongs, a verification step is also added: send the OLT device to the standby PON in the PON backup group through the OLT device to which the main PON port in the PON backup group belongs The OLT device to which the port belongs sends a backup completion message; receives the backup verification message returned by the OLT device to which the standby PON port belongs in the PON backup group, and the backup verification message carries a verification value; calculates the verification value and the local information Value comparison, if they are consistent, the backup is successful, if not, the backup message will be resent.

The backup method of the above-mentioned passive optical network OLT equipment can be applied to switching operations. The switching includes abnormal protection switching and manual switching.

Abnormal protection switching is that when the OLT device finds a fault, the OLT device belonging to the main PON port in the PON backup group sends a switching message to the OLT device belonging to the standby PON port in the PON backup group, and stops sending the notification message. And close the main PON port; the OLT device to which the standby PON port in the PON backup group belongs receives the switchover message, starts the standby PON port, and starts sending notification messages periodically. In addition, if the OLT device to which the standby PON port in the PON backup group belongs does not receive a notification message within a preset time, the standby PON port can also be switched to the active PON port to realize abnormal protection switching.

Manual switching can be applied to online upgrade: all main PON ports in the OLT device are switched to another OLT device, and the OLT device is upgraded; after the upgrade of the OLT device is completed, the other OLT device All the main PON ports in the switch are switched to the OLT device, and the other OLT device is upgraded. Of course, after upgrading the OLT equipment, load sharing can also be realized by redistributing the active and standby PON ports.

Embodiment 2 of the present invention takes dual-OLT device backup as an example for illustration. FIG. 3 is a network diagram of the dual-machine backup solution according to the present invention, including two POSs, and the uplink dual optical fibers of the POS are respectively connected to the corresponding devices of OLT1 and OLT2. The PON port, OLT1 and OLT2 need a link to communicate with the handshake protocol message and backup message. The link can be a twisted pair or an optical link. To ensure the reliability of the link Reliability, redundant link backup networking schemes such as aggregation or STP (Spanning Tree Protocol, Spanning Tree Protocol) can be used. The same POS uplink optical fiber is connected to two PON ports of OLT1 and OLT2 equipment. These two PON ports establish a PON backup group PBG (PON Backup Group, PON backup group), one of which is the role of Master (primary), and the other is Slave (slave). Multiple POS can adopt the load sharing method, set the Master of some PBGs on one device, and set the Master of other PBGs on another device.

The backup method based on the OLT equipment in Figure 2 can realize abnormal switching and manual switching without interruption of service, including the following steps:

Step s401, initial configuration of the PON port. Establish PBG1 and PBG2 on OLT1, add PON port M1 of OLT1 to PGB1, and S2 of OLT1 to PGB2; configure the priority of the two PON ports, for example, the priority of M1 is 20, and the priority of S2 is 10; establish PBG1 and PBG2 on OLT2 , Add PON port S1 of OLT2 to PGB1, and M2 of OLT2 to PGB2; configure the priority of the two PON ports, for example, the priority of M2 is 20, and the priority of S1 is 10.

Step s402, electing the active and standby PON ports. OLT1 and OLT2 each send PBG1 and PBG2 GA (General Advertisement, general notification message) to each other. GA is used for Master election and then the Master sends it to the Slave at a certain period to notify the Master that the status is normal. The message contains the PBG priority , the ID of the PGB or the port IDs of the local end and the peer end (Slave). After receiving the GA message from the other party, extract the PBG group information and priority information carried in the message, and compare it with the PON port priority information configured at the local end. If the PON port priority at the local end is low, no GA will be sent. If the priority of the port PON port is high, it will continue to send GA according to the predetermined period, which can be configured by the user. For example, OLT1 receives the GA message of PBG1 sent by OLT2, and finds that the priority 10 of the peer port S1 is lower than the priority of the local port M1, so OLT1 in this group is the main PON port, and OLT2 in PBG2 is also the main PON port.

After the election of the active and standby PON ports, two modes of preemption and non-preemption can also be added to the PBG group. Afterwards, if it is found that the local end has a higher priority, it will also send GA, and the OLT device to which the main PON port belongs receives the GA, sends SA (Switchover Advertisement, switchover notification message), and starts the active/standby switchover; if it is configured as non-preemptive mode, Even if the OLT device to which the standby PON port belongs receives the GA and finds that the local end has a higher priority, it maintains the current state.

In step s403, the information of the primary PON port is backed up to the standby PON port. After the election is completed, the OLT device of the main PON port can send the information of the main PON port to the OLT device of the standby PON port through the BM message, and the OLT device of the standby PON port will synchronize to the standby PON port according to these messages. Wherein, BM (Backup Message, backup message) is the message that carries PBG configuration and ONU registration and other related information sent by the OLT device to which the main PON port belongs. When PBG is configured for the first time, this backup is completed in batches. When the dual-system system is running, if the information of the main PON port changes, the OLT device to which it belongs will complete the real-time backup by sending BM messages in real time. The purpose of the backup is that after the switchover occurs, the new main PON port can enter the working state immediately, and all services do not have to wait for ONU re-registration and configuration re-delivery. In order to increase the reliability of the backup process, a master-standby handshake mechanism and verification mechanism can be added to the process. For example, before the OLT device of the master PON port sends a BM, it first sends a BackupRequest, and the OLT device of the backup PON port confirms a Backup Reply The OLT device belonging to the standby PON port is ready to receive BM, and the OLT device belonging to the main PON port will send BM again. The OLT device sends the Backup check message and carries the check value calculated according to the synchronized information in it. The OLT device belonging to the main PON port receives the Backup check and extracts the check value and compares it with the value calculated based on the local information. If they are consistent Then send a Backupsuccess message to complete this synchronization. If the two verification values are inconsistent, the OLT device to which the main PON port belongs will re-initiate synchronization.

Step s404, protection switching.

One is abnormal protection switching: when the OLT device of the main PON port finds that the PON port of this group is abnormal, it can immediately send SA messages to the OLT device of the standby PON port, and stop sending GA messages and close its own PON port. The OLT device that belongs to the port executes the switching command or the OLT device that belongs to the main PON port monitors that the PON port corresponding to the PBG is abnormal and sends it immediately, and notifies the OLT device that belongs to the backup PON port to switch the backup PON port to the new master PON port; the backup PON port After the OLT device receives the SA, it immediately activates its own PON port and starts sending GA messages periodically. When the main PON port is down, the OLT device to which the standby PON port belongs to waits for a period of time and does not receive a GA message. It should automatically switch and make the standby PON port the new main PON port. The waiting time can be set by the user Certainly.

The other is the manual switching process. After the OLT device of the main PON port executes the switching command, it sends an SA to the OLT device of the standby PON port, stops sending GA messages and closes its own PON port; the OLT device of the standby PON port receives Immediately after SA, enable its own PON port and start sending GA messages periodically. Command switching can provide specific group switching and all group switching. All group switching means that all PBGs whose local role is the main PON port of the OLT equipment implement the command switching process.

In addition, since the main purpose of the present invention is to perform backup protection on the PON trunk path, and does not care about the networking mode on the ONU side, it can be adapted to various PON backup protection schemes on the ONU side.

In Fig. 2, only two POS are taken as an example for illustration, but in fact it may include more than two POS, such as including three POS. The PON ports of the first two POS are the same as those in Figure 2. The PON port of the third POS is D on OLT1 and E on OLT1. Then establish PBG1, PBG2 and PBG3 on OLT1, and add its PON port M1 to PGB1. S2 is added to PGB2, D is added to PGB3; PBG1, PBG2 and PBG3 are established on OLT2, and its PON port S1 is added to PGB1, M2 is added to PGB2, and E is added to PGB3. Other operations are the same as those in Fig. 2 and will not be repeated here.

The embodiment of the present invention also provides an OLT device, which is applied to a passive optical network including at least two OLT devices, as shown in Figure 4, including: a PON backup group establishment unit 10, used to establish a passive optical network Backup group, different PON backup groups respectively include different PON ports. The election unit 20 is connected with the PON backup group establishment unit 10, and is used to elect the main PON port and the standby PON port in the PON backup group, and when the priority of the main PON port is lower than that of the standby PON port, a notification notification report The text sending unit 50 stops sending the general notification message, and when the standby PON port priority is higher than the main PON port, if the PON backup group is a preemption mode, then the standby PON port is switched to the main PON port, and the notification message sending unit is notified Periodically send a general notification message, if it is a non-preemptive mode, then the standby PON port maintains the current state; the port information backup unit 30 is connected with the election unit 20, and is used for the primary PON port in the PON backup group The information is backed up to the standby PON port. The PON port switching unit 40 is used to send a switching message to the peer OLT device when the local OLT device finds a fault, stop sending the notification message, and close the corresponding main PON port; and receive the switching message sent by the peer OLT device When sending a message, start the corresponding standby PON port and start sending notification messages periodically; or if the notification message sent by the peer OLT device is not received within the preset time, switch the corresponding standby PON port to be the main PON port. The general notification message sending and receiving unit 50 is used to regularly send a general notification message to the opposite end OLT device, and receive the general notification message sent from the opposite end OLT device, and when the predetermined time does not receive the general notification message sent by the opposite end OLT device Generally, when a message is notified, the PON port switching unit 40 is triggered.

Wherein, the port information backup unit 30 also includes a master-standby handshake subunit 32, which is used to send a backup request to the OLT device to which the standby PON port belongs to the PON backup group through the OLT device to which the master PON port belongs in the PON backup group, and Start the port information backup unit after receiving the backup response returned by the OLT device to which the standby PON port belongs. The verification subunit 31 is used to send a backup completion message to the OLT device belonging to the standby PON port in the PON backup group through the OLT device to which the main PON port belongs in the PON backup group, and receive the backup completion message of the backup PON port belonging to the PON backup group. The check value returned by the OLT device is compared with the calculated value of the local information. If they are consistent, the backup is successful. If they are inconsistent, the backup message is resent. The backup information sending and receiving subunit 33 is configured to send and receive backup information.

Wherein, the PON port switching unit 40 specifically includes: an abnormality detection subunit 41, which is used for fault detection of the OLT equipment; a switching message sending and receiving subunit 42, which is used for when the abnormality detection subunit detects that the local OLT equipment fails , sending a switching message to the peer OLT device; and receiving the switching message sent by the peer OLT device; the switching function operation subunit 43 is used to switch the main PON port to the backup PON port when the local OLT device detects a fault ; When receiving the switching message sent by the peer OLT device, or not receiving the general notification message sent by the peer OLT device within a predetermined time, switch the corresponding standby PON port to the primary PON port. The command switching subunit 44 is configured to receive a switching command from a user, and notify the switching function operation subunit to perform the switching operation of the active and standby PON ports.

Through the description of the above embodiments, those skilled in the art can clearly understand that the present invention can be implemented by means of software plus a necessary general-purpose hardware platform, and of course also by hardware, but in many cases the former is a better implementation Way. Based on this understanding, the essence of the technical solution of the present invention or the part that contributes to the prior art can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions to make a A computer device (which may be a personal computer, a server, or a network device, etc.) executes the methods described in various embodiments of the present invention.

The above disclosures are only a few specific embodiments of the present invention, however, the present invention is not limited thereto, and any changes conceivable by those skilled in the art shall fall within the protection scope of the present invention.

Claims (15)

1. the backup method of a passive optical network optical line terminal OLT equipment is applied to comprise in the EPON of at least two OLT equipment, it is characterized in that, said method comprising the steps of:

Set up the passive optical network PON backup group, different PON backup groups comprise different PON ports respectively;

Elect the main PON port in the described PON backup group and be equipped with the PON port;

The information back-up of the main PON port in the described PON backup group is arrived the described PON port that is equipped with.

2. the backup method of device for passive optical network OLT according to claim 1 is characterized in that, the main PON port in the described PON backup group of described election and be equipped with the PON port by the mutual notification packet realization of local terminal OLT equipment and opposite end OLT equipment.

3. as the backup method of device for passive optical network OLT as described in the claim 2, it is characterized in that, described elect the main PON port in the described PON backup group and be equipped with the PON port by local terminal OLT equipment and the opposite end mutual notification packet of OLT equipment specifically comprise:

Local terminal OLT equipment sends the notification packet of each PON backup group respectively to opposite end OLT equipment, comprises PON backup group information and precedence information in the described notification packet;

Local terminal OLT equipment receives the notification packet that opposite end OLT equipment sends, the PON port priority information of more described opposite end OLT equipment and the PON port priority information of local terminal OLT equipment, if the PON port priority height of local terminal OLT equipment, local terminal PON port in the then described PON backup group is main PON port, and opposite end PON port is for being equipped with the PON port.

4. as the backup method of device for passive optical network OLT as described in the claim 3, it is characterized in that described local terminal OLT equipment also comprises after receiving the notification packet that opposite end OLT equipment sends:

When being equipped with the PON port priority and being higher than main PON port, judge the attribute of described PON backup group, if contention mode, then being equipped with the PON port switching is main PON port; If be non-contention mode, then be equipped with the PON port and keep current state.

5. the backup method of device for passive optical network OLT according to claim 1 is characterized in that, described information back-up with the main PON port in the described PON backup group also comprises before being equipped with the PON port to described:

Send backup request by OLT equipment under the PON port fully of OLT equipment under the main PON port in the described PON backup group in the PON backup group, and receive the described backup response that the affiliated OLT equipment of PON port returns that is equipped with.

6. as the backup method of device for passive optical network OLT as described in claim 4 or 5, it is characterized in that described information back-up with the main PON port in the described PON backup group also comprises after being equipped with the PON port to described:

Send backup by OLT equipment under the PON port fully of OLT equipment under the main PON port in the described PON backup group in the PON backup group and finish message;

Receive the backup check message that the affiliated OLT equipment of PON port returns that is equipped with in the PON backup group, carry check value in the described backup verification message;

Described check value and local terminal information calculations value are compared,, then back up successfully,, then resend backup messages if inconsistent if consistent.

7. as the backup method of device for passive optical network OLT as described in the claim 3, it is characterized in that, the main PON port in the described election PON backup group and be equipped with the PON port after also comprise:

OLT equipment periodic OLT equipment under being equipped with the PON port sends notification packet under the main PON port in the described PON backup group.

8. the backup method of device for passive optical network OLT according to claim 1 is characterized in that, described information back-up with the main PON port in the PON backup group also comprises to the described PON port that is equipped with:

OLT equipment sends and switches message under the PON port fully of the affiliated OLT equipment of main PON port in the described PON backup group in described PON backup group, stops to send notification packet, and closes described main PON port;

OLT equipment is received and is switched message under the PON port fully in the described PON backup group, starts described PON port fully, and the beginning cycle sends notification packet;

The affiliated OLT equipment of PON port that is equipped with in the described PON backup group is not received notification packet in Preset Time, be main PON port with described PON port switching fully.

9. an OLT equipment is applied to comprise in the EPON of at least two OLT equipment, it is characterized in that, comprising:

The PON backup group is set up the unit, is used to set up the passive optical network PON backup group, and different PON backup groups comprise different PON ports respectively;

The election unit is set up the unit with described PON backup group and is connected, and is used for electing the main PON port of described PON backup group and is equipped with the PON port;

The port information backup units is connected with described election unit, is used for information back-up with the main PON port of described PON backup group to the described PON port that is equipped with.

10. as OLT equipment as described in the claim 9, it is characterized in that, also comprise:

General notification packet Transmit-Receive Unit is used for regularly sending general notification packet to opposite end OLT equipment, and receives the general notification packet that sends from opposite end OLT equipment.

11., it is characterized in that described port information backup units comprises as OLT equipment as described in the claim 9:

Backup information transmitting-receiving subelement is used to receive and dispatch backup information;

The active and standby subelement of shaking hands, be used for by OLT equipment under the main PON port of described PON backup group in the PON backup group be equipped with the PON port under OLT equipment send backup request, and receive and describedly be equipped with the backup response back that OLT equipment returns under the PON port and start described port information backup units.

12., it is characterized in that described port information backup units also comprises as OLT equipment as described in the claim 9:

The syndrome unit, be used for sending backup and finish message by OLT equipment under the PON port fully of OLT equipment under the main PON port of described PON backup group in the PON backup group, and the check value that OLT equipment returns under the PON port fully in the reception PON backup group, described check value and local terminal information calculations value are compared, if it is consistent, then back up successfully,, then resend backup messages if inconsistent.

13. as OLT equipment as described in the claim 9, it is characterized in that, also comprise:

Message when being used for local terminal OLT device discovery fault, is switched to the transmission of opposite end OLT equipment in PON port switching unit, stops to send notification packet, and closes corresponding main PON port; And receive that opposite end OLT equipment sends switch message the time, start the corresponding PON port that is equipped with, and the beginning cycle sends notification packet; Or in Preset Time, do not receive the notification packet that opposite end OLT equipment sends, with correspondence to be equipped with the PON port switching be main PON port.

14., it is characterized in that described PON port switching unit specifically comprises as OLT equipment as described in the claim 13:

The abnormality detection subelement is used for OLT equipment is carried out fault detect;

Switch the packet sending and receiving subelement, when being used for described abnormality detection subelement and detecting local terminal OLT equipment and break down, send to opposite end OLT equipment and to switch message; And receive the message of switching of opposite end OLT equipment transmission;

Switch function operation subelement when being used for local terminal OLT Equipment Inspection to fault, arrives PON port fully with main PON port switching; During the general notification packet of switching message or not receiving in the scheduled time that opposite end OLT equipment sends of receiving that described opposite end OLT equipment sends, correspondence is equipped with the PON port switching to main PON port.

15., it is characterized in that described PON port switching unit also comprises as OLT equipment as described in the claim 14:

Subelement is switched in order, is used to receive user's the order of switching, and notifies described switch function operation subelement to carry out the switching operation of active and standby PON port.

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