WO2012071828A1

WO2012071828A1 - Method and system for transmitting data based on full protection mode in passive optical network

Info

Publication number: WO2012071828A1
Application number: PCT/CN2011/071731
Authority: WO
Inventors: 耿丹; 何苑凌; 张伟良; 臧美燕
Original assignee: 中兴通讯股份有限公司
Priority date: 2010-12-03
Filing date: 2011-03-11
Publication date: 2012-06-07
Also published as: CN102487466B; CN102487466A

Abstract

A method and system for transmitting data based on full protection mode in a Passive Optical Network (PON). The method includes: a standby Optical Line Terminal (OLT) allocates an uplink bandwidth for a standby Optical Network Unit (ONU); after a main ONU complete to switch to the standby ONU, the standby ONU transmits data to the standby OLT in the uplink bandwidth. Applying the invention, when a failure occurs on OLT, fiber or ONU in the PON system, ONU and OLT can resume communication quickly, and the service quality of the PON system is improved.

Description

Method and system for transmitting data in passive optical network in full protection mode

Technical field

The present invention relates to the field of communications, and in particular, to a method and system for transmitting data in a Passive Optical Network (PON) in a full protection mode. Background technique

Gigabit-Capable Passive Optical Network (GPON) technology and Ethernet Passive Optical Network (EPON) are two important technology branches in the PON family. Similar to other PON technologies, GPON And EPON is also a passive optical access technology that uses a point-to-multipoint topology.

The topology of the PON system is shown in Figure 1. The PON consists of the Optical Line Terminal (OLT) on the central office, the Optical Network Unit (ONU) on the user side, and the Optical Distribution Network (ODN, Optical Distribution). Network ) is composed of a point-to-multipoint network structure. The ODN consists of passive optical components such as single-mode fibers, optical splitters, and optical connectors. The ODN provides an optical transmission medium for the physical connection between the OLT and the ONU.

In the PON system, the data transmission in the downlink direction (from the OLT to the ONU) is broadcast, and each ONU receives all the frames, and then according to the ONU identifier (ONU-ID) and the GPON encapsulation mode port identifier (GPON Encapsulation Mode- Port Identity (GEM-Port ID), and Allocation-identity (Alloc-ID), Medium Access Control ID (MAC ID), or Logical Link Identity (Logical Link Identity). Referred to as LLID) to get the frame of its own. For data transmission in the uplink direction (from ONU to OLT), since each ONU needs to share the transmission medium, each ONU should transmit uplink data in the time slot that the OLT arranges for itself. The distance between each ONU and the OLT is different. To prevent the uplink data sent by each ONU from reaching the OLT at the same time, the OLT needs to perform ranging on the ONU in the registration activation phase to implement uplink transmission synchronization.

In the deployment of passive optical networks, some users need higher security. It is hoped that operators can provide a guarantee mechanism to ensure that their service channels are not interrupted, or the requirements of the next level are: Ability to recover quickly after a business path is interrupted. This puts forward the requirements for protection paths and fast switching paths for passive optical networks carrying user services.

Figures 2a and 2b show a fully protected mode passive optical network topology in a PON system. The two OLTs are respectively connected to two 1:N splitters. Each splitter is connected to each ONU through the optical fiber in the downstream direction. There are two ONUs in each ONU, which are the primary ONU and the standby ONU, respectively. The OLT is connected to each active ONU through the optical splitter 1. The OLT2 (standby OLT) is connected to each standby ONU through the optical splitter 2 (the OLT1 and the OLT2 can be two independent OLTs, as shown in FIG. 2a, or an OLT). Two PON ports in the middle, as shown in Figure 2b). In the initial state, the OLT1 performs communication with all the active ONUs. When the OLT1 fails or the optical fiber between the OLT1 and the optical splitter 1 is interrupted, the OLT2 and all the standby ONUs perform service communication; if the optical splitter 1 A branch fiber is interrupted, or a primary ONU is present for service communication. In this way, full protection of the OLT, ONU, and each fiber in the PON system is achieved. In the above-mentioned full-protection mode, when the above-mentioned fault occurs, the related active ONU needs to switch all or part of its service or OLT1 to the standby ONU. In order to achieve fast recovery of services at the ONU, the primary service is used. After the ONU and the standby ONU complete the above-mentioned switching, the standby ONU needs to report to the OLT 2 that it has completed the switching to restore the service with the OLT. However, in the prior art, the standby ONU only sends the standby ONU after the switching process is completed. The allocation of the uplink bandwidth seriously affects the efficiency of service recovery, and in the prior art EPON system and GPON system, the data transmission between the standby OLT and the standby ONU is not clearly defined. Summary of the invention

The technical problem to be solved by the present invention is to provide a method and system for transmitting data in a passive optical network in a full protection mode to improve the efficiency of restoring service communication between the ONU and the OLT.

In order to solve the above technical problem, the present invention provides a method for transmitting data in a passive optical network in a full protection mode, including:

The backup optical line terminal (OLT) allocates an uplink bandwidth to the standby optical network unit (ONU); after the standby ONU and the primary ONU complete the switching, the standby bandwidth is used in the uplink bandwidth. The OLT sends data.

The foregoing method also has the following features: The step of the standby OLT for allocating uplink bandwidth to the standby ONU includes:

The standby OLT allocates uplink bandwidth to the standby ONU according to an allocation command of the primary OLT or the network management system.

The foregoing method further has the following features: the step of the standby OLT periodically allocating the uplink bandwidth to the standby ONU includes: the standby OLT periodically allocating the shared uplink bandwidth to the standby ONU.

The foregoing method has the following features: the step of the standby OLT for allocating the uplink bandwidth to the standby ONU includes: after the standby OLT receives the configuration information of the active ONU sent by the active OLT or the network management system, directly or periodically All the standby ONUs corresponding to the primary ONUs allocate shared uplink bandwidth.

The foregoing method further has the following feature: the step of the standby ONU sending data to the standby OLT in the uplink bandwidth includes:

The standby ONU sends the random uplink delay to the standby OLT after the time when the uplink data corresponding to the shared uplink bandwidth starts to arrive, or after a random delay occurs from the time when the uplink data corresponding to the shared uplink bandwidth is transmitted. data.

The foregoing method also has the following features: The step of the standby OLT periodically allocating the uplink bandwidth to the standby ONU includes: the standby OLT periodically allocates a dedicated uplink bandwidth for each standby ONU.

The foregoing method has the following features: the step of the standby OLT for allocating the uplink bandwidth to the standby ONU includes: after the standby OLT receives the configuration information of the primary ONU sent by the active OLT or the network management system, directly or periodically for each The standby ONUs corresponding to the primary ONUs respectively allocate dedicated uplink bandwidths.

The above method also has the following feature: the dedicated uplink bandwidth allocated for each standby ONU is identified by the identity information of the standby ONU or the identity information of the primary ONU corresponding to the standby ONU.

In order to solve the above problems, the present invention also provides a system for transmitting data in a passive optical network in a full protection mode, including an OLT and an ONU, where: The OLT is set to: allocate an uplink bandwidth to the standby ONU;

The standby ONU is set to: After the primary ONU completes the switching, sends data to the standby OLT within the uplink bandwidth.

The system has the following features: The backup OLT includes: an allocating module, configured to: allocate a shared uplink bandwidth for the standby ONU or allocate a dedicated dedicated to each standby ONU according to an allocation command of the primary OLT or the network management system; Upstream bandwidth.

The above system also has the following features: the standby OLT includes a first receiving module and an allocating module, wherein:

The first receiving module is configured to: after receiving configuration information of the primary ONU sent by the primary OLT or the network management system, triggering the allocation module;

The allocation module is configured to: after being triggered, directly or periodically allocate a shared uplink bandwidth for all standby ONUs corresponding to the primary ONU.

The above system further has the following features: the standby ONU includes a second receiving module, a switching module, and a sending module;

The second receiving module is configured to: receive the shared uplink bandwidth allocated by the standby OLT; and the switching module is configured to: after the primary ONU completes the switching, triggering the sending module;

The sending module is configured to: when triggered, when the time of starting to transmit uplink data corresponding to the shared uplink bandwidth received by the second receiving module arrives, or to transmit uplink data from the beginning of the shared uplink bandwidth After a random delay, the data is sent to the standby OLT.

The system has the following features: the standby OLT includes a first receiving module and an allocating module; the first receiving module is configured to: after receiving the configuration information of the primary ONU sent by the primary OLT or the network management system, triggering the allocation module;

The allocation module is configured to: after being triggered, directly or periodically allocate a dedicated uplink bandwidth for each standby ONU corresponding to the primary ONU, and the dedicated uplink bandwidth allocated for each standby ONU passes through the standby ONU. The identity information or the identity information of the primary ONU corresponding to the standby ONU is identified. In summary, the present invention provides a method and system for transmitting data in a passive optical network in a full protection mode, which may have a specific message in a standby ONU in a protected mode when an OLT, an optical fiber, or an ONU in a PON system fails. When the OLT needs to be sent to the standby OLT, the standby ONU can send uplink data in the specific uplink bandwidth allocated by the standby OLT, so that the ONU and the OLT can quickly resume communication and improve the service quality of the PON system. BRIEF abstract

Figure 1 Topology of the PON system

2a and 2b are topological structural diagrams of a passive optical network in a full protection mode;

3 is a schematic diagram of a system for transmitting data in a passive optical network in a full protection mode of the present invention;

4 is a flow chart showing a method of transmitting data in a passive optical network in the full protection mode of the present invention. Preferred embodiment of the invention

For a better understanding of the invention, the invention will be further described in conjunction with the drawings and specific embodiments.

3 is a schematic diagram of a system for transmitting data in a passive optical network in a full protection mode according to the present invention. The topology of the system in the embodiment of the present invention is as shown in FIG. 2a or FIG. 2b, and the OLT1 (primary OLT) passes the splitting. Device 1 is connected to all active ONUs. The ONU registration activation is performed between the OLT1 and the primary ONU according to the prior art in the EPON or the EPON-based next-generation PON, or the OLT1 and the primary ONU are in the next generation PON according to GPON or GPON technology. There is a technology for registration activation of the ONU, and transmission of service data between the OLT 1 and the primary ONU. In the system of the embodiment,

The standby OLT is configured to allocate an uplink bandwidth to the standby ONU.

The standby ONU is configured to send data to the standby OLT in the uplink bandwidth after performing the switching with the primary ONU corresponding thereto.

In this way, the primary OLT, the primary ONU fails, or the fiber link has problems. The ONU can transmit data to the standby OLT through the allocated upstream bandwidth, so that the ONU and the OLT can quickly resume communication.

As shown in FIG. 3, the standby OLT in the system may include: an allocation module, configured to allocate a shared uplink bandwidth to the standby ONU according to an allocation command of the primary OLT or the network management system, or separately allocate a dedicated uplink for each standby ONU. (specific) upstream bandwidth.

In the case that only the primary ONU is registered on the active OLT, the primary OLT will configure the configuration information of all the active ONUs registered on the OLT when it detects an uplink optical link error or detects that it has a fault. The configuration information of the primary ONU that is faulty on the upstream optical link is sent to the standby OLT, or the configuration information of the relevant primary ONU is sent to the standby OLT through the network management system. After receiving the configuration information of the relevant primary ONU, the standby OLT allocates the shared uplink bandwidth to the standby ONU according to the command of the primary OLT or the network management system, or allocates dedicated uplink bandwidth for each standby ONU.

The backup OLT further includes a receiving module, configured to: after receiving the configuration information allocated by the primary OLT or the network management system for the primary ONU, trigger the allocation module; and the allocation module is configured to be triggered The standby ONU corresponding to the primary ONU allocates a shared uplink bandwidth, and the shared uplink bandwidth is identified by a specific value; or, for each of the standby ONUs corresponding to the primary ONU, a specific dedicated uplink bandwidth is allocated, and the dedicated uplink bandwidth is respectively allocated. It is identified by the identity information of the corresponding primary ONU or the identity information of the standby ONU.

The identity information of the primary ONU may be the Alloc-ID, the ONU-ID, the GEM-Port ID, the MAC ID, or the LLID allocated by the primary OLT as the primary ONU, and the identity information of the standby ONU may be the standby OLT. Information such as Alloc-ID, ONU-ID, GEM-Port ID, MAC ID, or LLID assigned by the ONU.

The standby ONU includes: a receiving module, a switching module, and a sending module, where the receiving module is configured to receive a shared uplink bandwidth or a specific uplink bandwidth allocated by the standby OLT; and the switching module is configured to trigger the sending after the switching is performed with the corresponding primary ONU. a module; the sending module is configured to: when the time when the shared uplink bandwidth or the specific uplink bandwidth corresponds to start transmitting uplink data, or when the time when the uplink data corresponding to the shared uplink bandwidth starts to arrive arrives, a random After the delay, data is sent to the standby OLT.

In the case where the primary ONU and the standby ONU are registered on the primary OLT and the standby OLT, respectively, The standby OLT may periodically allocate a shared uplink bandwidth for all the standby ONUs registered on itself, or allocate a dedicated uplink bandwidth for each standby ONU, or may be a related standby ONU under the command of the primary OLT or the network management system. Allocate upstream bandwidth.

4 is a flow chart of a method for transmitting data in a passive optical network in a full protection mode according to the present invention. As shown in FIG. 4, the method may include the following steps:

S10. The standby OLT allocates an uplink bandwidth to the standby ONU.

S20. After the standby ONU and the corresponding primary ONU complete the switching, send data to the standby OLT in the uplink bandwidth.

In this way, in the failure of the primary OLT, the primary ONU, or the fiber link, the standby ONU can transmit data through the allocated uplink bandwidth and the standby OLT, so that the ONU and the OLT can quickly resume communication.

Embodiment 1

The topology structure of the passive optical network in the full protection mode of this embodiment is as shown in FIG. 2a or FIG. 2b.

The OLT 1 is connected to all active ONUs through the splitter 1. The ONU registration discovery is performed between the OLT 1 and the primary ONU according to the prior art in the EPON or the EPON-based next-generation PON, and the service data is transmitted between the OLT 1 and the primary ONU. When the optical fiber between the OLT 1 and the optical splitter 1 is disconnected, or when some or all of the optical fibers between the optical splitter 1 and the primary ONU are disconnected, or when the reception of the OLT 1 fails, or the transmission of the primary ONU fails, OLT1 detects that the upstream optical link of some ONUs or all ONUs is faulty. The OLT and the ONU resume communication according to the following main steps:

Step 101: When the OLT1 detects that an uplink optical link of some or all of the active ONUs is in error, the OLT1 configures the LLID and the virtual local area network (Virtual Local Area Network) allocated for the primary ONU that is in the uplink optical link error. The information is sent to the OLT 2, and at the same time, the OLT 2 is notified to the standby ONU corresponding to the primary ONU that has an uplink optical link error or to allocate a specific shared uplink bandwidth to all the standby ONUs. The LLID corresponding to the shared uplink bandwidth is 0x7FFE (the 0x7FFE value here is only an example of the embodiment, and may be other specifics in other embodiments. Value).

After receiving the foregoing message sent by the OLT1, the OLT2 allocates the specific shared uplink bandwidth to the corresponding standby ONU.

Step 102: Some or all of the active ONUs cannot receive the downlink optical, and the primary ONU that cannot receive the downlink optical switches the service data that needs to be sent to the OLT1 and the configuration information such as the LLID and the VLAN allocated by the active OLT to the standby. On the ONU;

After receiving the data of the above-mentioned switching, the backup ONU determines that the specific uplink bandwidth is the value of the LLID corresponding to the shared uplink bandwidth, after receiving the specific shared uplink bandwidth sent by the OLT 2 in step 101. For the specific shared uplink bandwidth, the standby ONU sends a message to the OLT2 in the specific shared uplink bandwidth, and notifies the backup OLT that the data has been switched.

Step 103: After the OLT2 receives the message sent by the standby ONU in step 102, the OLT2 and the standby ONU perform the transmission of the service data between the OLT and the ONU according to the existing technology in the EPON or the next-generation PON based on the EPON technology.

In this embodiment, when the OLT1 detects that an uplink optical link of some or all of the active ONUs is in error, the OLT1 sends configuration information such as LLID and VLAN allocated to the primary ONU that is in error of the uplink optical link to the OLT2. In other embodiments, the configuration information such as the LLID and the VLAN allocated to the primary ONU that is faulty for the upstream optical link may be reported to the network management system by the OLT 1. The network management system sends the content to the OLT 2. The OLT1 may also notify the OLT 2 to allocate a dedicated uplink bandwidth to the standby ONUs corresponding to the primary ONUs of the uplink optical link, and the LLIDs corresponding to the dedicated uplink bandwidths are respectively allocated by the OLT1 for the primary ONUs with the uplink optical link errors. LLID.

In other embodiments, when the OLT1 fails, the OLT1 sends the configuration information allocated for all the primary ONUs to the OLT2, and notifies the OLT2 to allocate a specific shared uplink bandwidth to all the standby ONUs, or notifies the OLT2 to give All the standby ONUs are assigned a specific dedicated uplink bandwidth. When the OLT1 fails, the OLT1 reports the configuration information allocated to all the primary ONUs to the network management system. The network management system sends the configuration information to the OLT2 and notifies the OLT2. All standby ONUs allocate a specific shared upstream bandwidth, or allocate a specific dedicated upstream bandwidth to all standby ONUs. Alternatively, in other embodiments, the OLT 1 may periodically send configuration information such as LLID and VLAN allocated to the primary ONU to the OLT 2, and the OLT 2 stores the information and provides a backup corresponding to the primary ONU in a certain period. The ONU allocates a specific shared upstream bandwidth, or assigns a specific dedicated upstream bandwidth to all the standby ONUs.

In this embodiment, the standby ONU sends data in the shared uplink bandwidth allocated by the OLT2, for example, the data switching completion message. In other embodiments, the standby ONU may also send Dying_Gapp in the shared uplink bandwidth. Stop notification) Messages or other content that the standby ONU needs to report to the OLT.

In this embodiment, the standby ONU may send a data switching message when the time when the uplink data corresponding to the shared uplink bandwidth allocated by the OLT2 starts to transmit uplink data. In other embodiments, the standby ONU may also select to send data to the OLT2 after a random delay time arrives at the time when the transmission of the uplink data corresponding to the specific shared uplink bandwidth arrives, for example, a data switching completion message. Dying—The Gasp message or the alternate ONU needs to report other content to the OLT to avoid conflicts.

In this embodiment, the standby ONU and the primary ONU may be two logical ONUs located in the same ONU, or may be two PON ports belonging to the same ONU, and the two logical ONUs or the same ONU. Each PON port has its own optical module and media access control chip, and is managed by a common CPU.

This embodiment is applicable to EPON systems and next-generation PON systems based on EPON technology, such as

10G EPON system.

Embodiment 2

The passive optical network topology of the full protection mode of this embodiment is as shown in FIG. 2a or FIG. 2b, and the OLT 1 is connected to all active ONUs through the optical splitter 1. The ONU registration discovery is performed between the OLT 1 and the primary ONU according to the prior art in the EPON or the EPON-based next-generation PON, and the service data is transmitted between the OLT 1 and the primary ONU. The OLT 2 is connected to all the standby ONUs through the optical splitter 2, and the ONU registration is found between the OLT 2 and the standby ONU according to the prior art in the EPON or the EPON-based next-generation PON. The OLT 2 and the standby ONU do not. Transfer business data.

The OLT2 allocates a specific uplink bandwidth to the standby ONU according to the command of the OLT1 or the network management system, or periodically or irregularly. The LLID corresponding to the uplink bandwidth is an LLID value allocated by the OLT2 for the standby ONU. The standby ONU uses the upstream bandwidth to transmit data to the OLT 2, such as maintaining the MPCP (Multipoint Control Protocol) message of the link.

When a link failure occurs between OLT1 and a primary ONU, such as when the optical fiber between OLT1 and optical splitter 1 is disconnected, or some or all of the optical fibers between optical splitter 1 and primary ONU are disconnected, or the reception of OLT1 fails. When the transmission of the primary ONU fails, the OLT1 detects that the upstream optical link of some ONUs or all the ONUs is faulty. The OLT and the ONU resume communication according to the following main steps:

Step 201: When the OLT1 detects that an uplink optical link of some or all of the active ONUs is in error, the OLT1 sends a switching message to the primary ONU through the primary link, and switches the service flow of the ONU with the upstream optical link error to OLT2.

Step 202: Some or all of the active ONUs cannot receive the downlink optical, or after receiving the switching message of the OLT1, the service data and the VLAN and other configuration information that are sent to the OLT1 are switched to the corresponding standby ONU.

After receiving the above-mentioned switched data, the standby ONU sends a message of completion of switching to the OLT2 within the specific uplink bandwidth allocated by the OLT2, and notifies the standby OLT that the data has been completely converted.

Step 203: After the OLT2 receives the message sent by the standby ONU in step 202, the OLT2 and the standby ONU perform the transmission of the service data between the OLT and the ONU according to the prior art in the EPON or the next-generation PON based on the EPON technology.

In this embodiment, the primary ONU and the standby ONU complete registration at OLT1 and OLT2, respectively, to obtain respective LLIDs. The OLT2 allocates a specific uplink bandwidth to the standby ONU periodically or irregularly. The OLT1 switches the service flow of the primary ONU to the OLT2 when the OLT1 detects that the upstream optical link of some or all of the primary ONUs is faulty. Alternatively, after receiving the command of the OLT1 or the network management system, the OLT2 allocates a specific uplink bandwidth to the corresponding standby ONU.

In this embodiment, the standby ONU transmits data at a specific uplink bandwidth allocated by the OLT2, for example, The data switching completion message, in other embodiments, the standby ONU may also send a Dying_Gapp message in the specific uplink bandwidth or other content that the standby ONU needs to report to the OLT.

In this embodiment, the standby ONU and the primary ONU are two logical ONUs located in the same ONU, or two PON ports belonging to the same ONU, and the two logical ONUs or two PON ports of the same ONU. Each has its own optical module and media access control chip, and is managed by a common CPU.

This embodiment is applicable to EPON systems and next-generation PON systems based on EPON technology, such as 10G EPON systems.

Embodiment 3

The OLT 1 is connected to all active ONUs through the splitter 1. The ONU registration activation is performed between the OLT1 and the primary ONU according to the prior art in the GPON or the GPON-based next-generation PON, and the service data transmission between the OLT and the ONU is performed. When the optical fiber between the OLT 1 and the optical splitter 1 is disconnected, or when some or all of the optical fibers between the optical splitter 1 and the primary ONU are disconnected, or when the reception of the OLT 1 fails, or the transmission of the primary ONU fails, OLT1 detects that the upstream optical link of some ONUs or all ONUs is faulty. The OLT and the ONU resume communication according to the following main steps:

Step 301: When the OLT1 detects that an uplink optical link of some or all of the active ONUs is faulty, the OLT1 allocates an ONU_ID, an Alloc_ID, a GEM Port_ID, and a VLAN to the primary ONU that is in error of the uplink optical link. The configuration information such as the OMCI channel is sent to the OLT2, and the OLT2 is notified to allocate a specific shared uplink bandwidth to the standby ONU or all the standby ONUs with the uplink optical link error.

The value of Alloc_ID of the allocation structure corresponding to the shared uplink bandwidth is 254 (the value here is only an example of the embodiment, and may be other specific values in other embodiments).

After receiving the foregoing message sent by the OLT1, the OLT2 allocates the specific shared uplink bandwidth to the standby ONU.

Step 302: Some or all of the active ONUs cannot receive the downlink light, and the primary ONU that cannot receive the downlink light needs to send the service data that needs to be sent to the OLT1 and the primary OLT to the own. Configuration information such as ONU—ID, Alloc—ID, GEM Port—ID, VLAN, and OMCI channel are switched to the standby ONU.

After receiving the above-mentioned switched data, the standby ONU determines that the specific bandwidth is the value of the Alloc_ID value 254 corresponding to the shared bandwidth after receiving the specific shared uplink bandwidth sent by the OLT2 in step 301. For a specific shared uplink bandwidth, the standby ONU sends a PLOAM (Physical Layer Operation Administration Management) message named Switch-Over to the OLT 2 in the specific shared uplink bandwidth. , notify the standby OLT that it has completed the conversion of the above data.

The format of the PLOAM message whose name is Switch-Over is shown in Table 1: Table 1

As shown in Table 1, the first byte of the Switch_Over message is the value of the ONU-ID, indicating that the message is sent by the ONU whose ONU-ID value is ONU-ID1; the content of the second byte indicates the PLOAM message. The type of the structure information of the Switch-Over message type; the contents of the 3rd to 12th bytes are reserved fields.

Step 303: After the OLT2 receives the Switch_Over message sent by the standby ONU in step 302, the OLT2 and the standby ONU perform service data between the OLT and the ONU according to the prior art in the GPON or the GPON-based next-generation PON. Transmission.

In this embodiment, when the OLT1 detects an uplink optical link error of some or all of the active ONUs, the OLT1 allocates an ONU_ID, an Alloc_ID, and a GEM Port to the primary ONU that is in error for the upstream optical link. The configuration information such as the ID, the VLAN, and the OMCI channel is sent to the OLT 2, and the OLT 2 is notified to allocate a specific shared uplink bandwidth to the standby ONU or all the standby ONUs of the primary ONU that is in the uplink optical link error. In other embodiments, The above configuration can be implemented with OLT1 The information is reported to the network management system, and the network management system sends the configuration information to the OLT2, and notifies the OLT2 to allocate a specific shared uplink bandwidth to the standby ONU or all the standby ONUs corresponding to the primary ONU of the uplink optical link. The standby ONU corresponding to the primary ONU of the optical link is allocated a specific dedicated uplink bandwidth, and the value of the Alloc_ID of the allocation structure corresponding to the dedicated uplink bandwidth is OLT1 is the uplink optical link. The ONU-ID value assigned by the primary ONU that failed.

In other embodiments, the OLT1 may periodically send configuration information such as an ONU_ID, an Alloc_ID, a GEM Port_ID, a VLAN, and an OMCI channel allocated for the primary ONU to the OLT2, and the OLT2 stores the foregoing information, and The standby ONU is allocated a specific shared upstream bandwidth in a certain period.

In other embodiments, when the OLT1 detects that the fault occurs, the configuration information such as the ONU_ID, Alloc_ID, GEM Port_ID, VLAN, and OMCI channel allocated to the primary ONU is sent to the OLT2, or The network management system forwards it to OLT2.

In this embodiment, the standby ONU sends a Swich_Over message in the shared uplink bandwidth allocated by the OLT2. In other embodiments, the standby ONU may also send a Dying_Gapp message in the shared uplink bandwidth or the standby ONU needs to report the message to the standby ONU. Other content of the OLT.

In this embodiment, the standby ONU sends a Swich_Over message when the time for starting to transmit uplink data corresponding to the shared uplink bandwidth allocated by the OLT2 arrives. In other embodiments, the standby ONU may also be selected in the specific share. After the time when the uplink data starts to transmit the uplink data arrives, the OLT2 sends a Swich_Over message, a Dying_Gapp message, or other content that the standby ONU needs to report to the OLT after a random delay.

This embodiment is applicable to GPON systems and next-generation PON systems based on GPON technology, such as XG PON systems.

In other embodiments, the ONU registration discovery is performed between the OLT 1 and the primary ONU according to the prior art in the GPON or the GPON-based next-generation PON, and the service data is transmitted between the OLT and the ONU. OLT2 is connected to all standby ONUs through splitter 2, OLT2 The registration of the ONU is performed between the standby ONU and the standby ONU according to the prior art in the GPON or the GPON-based next-generation PON, and no service data is transmitted between the OLT 2 and the standby ONU.

The OLT2 allocates a specific uplink bandwidth to the standby ONU according to the command of the OLT1 or the network management system, or periodically or irregularly. The standby ONU uses the upstream bandwidth to send a message to OLT2.

The present invention solves the problem that when the OLT, the ONU, or a certain optical fiber in the PON system fails in the failure of the standby OLT in the full protection mode to periodically or irregularly allocate a specific uplink bandwidth to the standby ONU, the primary ONU uses its own service. After all or part of the configuration is switched to the standby ONU, the standby ONU cannot report to the standby OLT that it has completed the switching operation.

One of ordinary skill in the art will appreciate that all or a portion of the above steps may be accomplished by a program instructing the associated hardware, such as a read-only memory, a magnetic disk, or an optical disk. Alternatively, all or part of the steps of the above embodiments may also be implemented using one or more integrated circuits. Correspondingly, each module/unit in the above embodiment may be implemented in the form of hardware or in the form of a software function module. The invention is not limited to any specific form of combination of hardware and software.

The above is only a preferred embodiment of the present invention, and of course, the present invention may be embodied in various other embodiments without departing from the spirit and scope of the invention. Corresponding changes and modifications are intended to be included within the scope of the appended claims.

Industrial applicability

The present invention provides a method and system for transmitting data in a passive optical network in a full protection mode. When an OLT, an optical fiber, or an ONU in a PON system fails, a specific message in the protected ONU has a specific message to be sent to When the OLT is in standby mode, the standby ONU can send uplink data in a specific uplink bandwidth allocated by the standby OLT, so that the ONU and the OLT can quickly resume communication and improve the service quality of the PON system.

Claims

Claim

A method for transmitting data in a passive optical network in a full protection mode, the method comprising: a backup optical line terminal (OLT) allocating an uplink bandwidth to a standby optical network unit (ONU); the standby ONU and the primary use After the ONU completes the switching, data is sent to the standby OLT within the uplink bandwidth.

2. The method of claim 1, wherein the step of the standby OLT to allocate the uplink bandwidth to the standby ONU comprises:

The method of claim 2, wherein the step of the standby OLT periodically allocating the uplink bandwidth to the standby ONU comprises: the standby OLT periodically allocating the shared uplink bandwidth to the standby ONU.

The method of claim 1, wherein the step of the standby OLT to allocate the uplink bandwidth to the standby ONU includes: after the standby OLT receives the configuration information of the primary ONU sent by the primary OLT or the network management system Allocating a shared uplink bandwidth directly or periodically for all the standby ONUs corresponding to the primary ONU.

The method according to claim 3 or 4, wherein the step of the standby ONU transmitting data to the standby OLT in the uplink bandwidth includes:

The method of claim 2, wherein the step of the standby OLT periodically allocating the uplink bandwidth to the standby ONU comprises: the standby OLT periodically assigning a dedicated uplink bandwidth to each of the standby ONUs.

The method of claim 1, wherein the step of the standby OLT to allocate the uplink bandwidth to the standby ONU includes: after the standby OLT receives the configuration information of the active ONU sent by the active OLT or the network management system, directly Or, each of the standby ONUs corresponding to the primary ONUs is allocated a dedicated uplink bandwidth periodically.

8. The method according to claim 6 or 7, wherein

The dedicated uplink bandwidth allocated for each standby ONU is identified by the identity information of the standby ONU or the identity information of the primary ONU corresponding to the standby ONU.

9. A system for transmitting data in a passive optical network in a full protection mode, comprising an alternate optical path terminal (OLT) and a backup optical network unit (ONU), wherein:

The standby OLT is configured to: allocate an uplink bandwidth to the standby ONU;

The standby ONU is configured to: after the primary ONU completes the switching, send data to the standby OLT in the uplink bandwidth.

10. The system of claim 9, wherein the backup OLT comprises:

The allocation module is configured to: allocate a shared uplink bandwidth to the standby ONU or allocate a dedicated uplink bandwidth for each standby ONU according to an allocation command of the primary OLT or the network management system.

11. The system of claim 9, wherein the backup OLT comprises a first receiving module and an allocating module;

The first receiving module is configured to: after receiving the configuration information of the primary ONU sent by the primary OLT or the network management system, trigger the allocation module;

The system of claim 10 or 11, wherein the standby ONU comprises a second receiving module, a switching module and a sending module;

The second receiving module is configured to: receive the shared uplink bandwidth allocated by the standby OLT; the switching module is configured to: after the main ONU completes the switching, trigger the sending module; the sending module is set to: triggered After the time when the transmission of the uplink data corresponding to the shared uplink bandwidth received by the second receiving module arrives, or after a random delay from the time when the uplink data corresponding to the shared uplink bandwidth is transmitted, , sending data to the standby OLT.

13. The system of claim 9, wherein the backup OLT comprises a first receiving module And distribution module;

The allocation module is configured to: after being triggered, directly or periodically allocate a dedicated uplink bandwidth for each standby ONU corresponding to the primary ONU, and the dedicated uplink bandwidth allocated for each standby ONU passes through the standby ONU. The identity information or the identity information of the primary ONU corresponding to the standby ONU is identified.