WO2012071919A1

WO2012071919A1 - Method for isolating constant optical onu in gpon system

Info

Publication number: WO2012071919A1
Application number: PCT/CN2011/079415
Authority: WO
Inventors: 徐永国; 范雨晓; 张勇; 安俊峰
Original assignee: 烽火通信科技股份有限公司
Priority date: 2010-12-01
Filing date: 2011-09-07
Publication date: 2012-06-07
Also published as: CN102006118B; MY165483A; CN102006118A

Abstract

Disclosed is a method for isolating a constant optical ONU in a GPON system. By way of sending a PLAOM message, an OLT first closes and then opens after a delay the lasers of all the ONUs in the GPON system one by one; after the lasers of an ONU are closed, the OLT queries the serial numbers of the other ONUs, and acquires the judgment result of whether the current ONU is a constant optical ONU according to whether or not the OLT can receive the serial numbers replied by the other ONUs when the laser of the current ONU is closed, wherein when the judgment result indicates that the ONU is a constant optical ONU, the laser of the ONU is closed permanently by way of sending a PLAOM message until all the ONUs are completed. The present invention realizes the isolation of the constant optical ONU in the GPON system by way of the above method and ensures service safety of the GPON system.

Description

Method for isolating long-lighting ONU in GPON system

The invention relates to a method for guaranteeing service security of a GPON system, and particularly relates to a method for isolating a long-lighting ONU in a GPON system.

Background technique

GPON is a technology that has been rapidly developed in recent years. GPON (Gigabit passive optical network) is a Gigabit/Gigabit passive optical network and a passive passive optical network. Compared with other PON standards, the GPON standard provides unprecedented high bandwidth, with a downlink rate of up to 2.5 Gbit/s, and its asymmetric characteristics are more suitable for broadband data services. It provides full service guarantee of QoS, and has good service level, QoS guarantee and full service access capability. With a transmission distance of up to 20 kilometers, it has many features such as high bandwidth, high speed, high efficiency transmission, wide coverage, and rich user interfaces. It has been regarded by most operators as broadband and integrated transformation of access network services. Ideal technology.

In the GPON system, the upper and lower directions use different working wavelengths, and the operating wavelength range in the downlink direction is 1480~1500nm, generally 1490nm, and the working wavelength range in the uplink direction is 1260-1360 nm, generally 1310nm. The uplink data frame is synchronized with the downlink data frame, and the uplink data stream shares the uplink bandwidth in a time division multiplexing manner. The OLT indicates the allowed position of the uplink data stream in the uplink data frame in units of bytes in the downlink data frame. The OLT sends pointers in the PCBd that indicate the start and end times of each upstream transmission of the upstream data stream. In this way, only one ONU can access the medium at any time, and no collision will occur under normal working conditions. Once an ONU does not send data streams according to the bandwidth mapping of the OLT, the entire PON port may not work. Work. The "flowing" ONU is such an ONU, and the long-emitting ONU is another kind of "rogue" ONU.

Long illuminating 0NU means that the faulty laser generator sends an optical signal (continuous or intermittent) to the fiber, or the 0NU SoC has failed (eg: CPU hangs, incorrectly configured transmission time and control in GPON TC circuitry) a phenomenon produced by the signal). If a 0NU laser has a long illuminating phenomenon, all 0NUs on the entire P0N port will not work properly. Therefore, how to automatically detect and isolate the long-illuminated rogue 0NU is very important to ensure the security of the GPON system.

Summary of the invention

The technical problem to be solved by the present invention is to solve the problem of how to automatically detect and isolate the long-emitting ONU in the GPON system, thereby ensuring the service security of the GPON system.

In order to solve the above technical problem, the technical solution adopted by the present invention is to provide a method for isolating a long-lighting ONU in a GPON system, comprising the following steps:

A10. The OLT periodically queries the serial numbers of all ONUs.

A20. The OLT first turns off and then delays turning on all the ONU lasers in the GPON system according to the received serial number of the ONU. After the ONU laser is turned off, the OLT queries the serial numbers of other ONUs, and When the current ONU laser is turned off, the OLT can receive the serial number of the other ONU reply, and obtain the judgment result of whether the current ONU is a long-light ONU. When the judgment result indicates that the ONU is a long-light ONU, the PLOM message is sent. The mode permanently turns off the ONU's laser until all ONUs are completed.

In the above method, in step A10, the OLT establishes an authorized ONU table and an online ONU table according to the obtained serial number of the ONU. In step A20, the authorized ONU table is traversed first, and all ONUs in the table are first turned off and then delayed. Its laser, if the judgment result indicates that the ONU is authorized If there is no long-emitting ONU in the table, then the online ONU table is traversed, and the ONUs in the table are turned off one by one and then the laser is turned on until all the ONUs are completed.

In the above method, if the judgment result in the step A20 indicates that there is no long-lighting ONU in the authorized ONU table and the online ONU table, the OLT sends a broadcast PLOAM message, turns off all the lasers of the ONU connected thereto, and then traverses the authorized ONU table. , send a PLOAM message to each ONU in a pair of tables, and turn on its laser.

In the above method, the following steps are performed before step A10:

B10. The OLT detects the working state of the PON port.

B20. Whether the PON port receives the LOS alarm to obtain a judgment result of whether the PON port is in a normal working state, and when the judgment result indicates that the PON port is in a normal working state, the process proceeds to step B10; otherwise, the process proceeds to step B30;

B30, detecting optical power through the RSSI interface, if the detected optical power is 0, then proceed to step B40; otherwise, go to step A10;

B40, OLT again query the serial number of the ONU, if the serial number of any ONU cannot be obtained, go to step B50; otherwise, go to step B10;

B50, the optical power is detected again by the RSSI. If the optical power is 0, the process proceeds to step B10; otherwise, the process proceeds to step A10.

In the foregoing method, the process of processing the PLOAM message by the ONU in step A20 is as follows: C10: After receiving the PLOAM message from the OLT, the ONU determines whether the PLOAM message is a DISABLE SN message, and if it is not a DISABLE SN message, ignores the PLOAM message; Otherwise, go to step C20;

C20. Determine whether the PLOAM message is a broadcast message. If it is a broadcast message, go to the step.

C50; Otherwise, go to step C30; C30, determining whether the SN of the ONU carried in the PLOAM message is consistent with its own SN, if not, do nothing; otherwise, go to step C40;

C40. Determine whether the command ID in the PLOAM message is DISABLE or ENABLE. If it is ENABLE, the ONU turns on its laser. If it is DISABLE, the ONU turns off its laser;

C50. Parse the PLOAM message and obtain the content of the command ID. If the command ID is ENABLE, the ONU turns on its laser; if it is DISABLE, the ONU turns off its laser.

According to the invention, by turning off the laser of the ONU, and detecting whether the ONU is a long-emitting ONU according to whether other ONU reply sequence numbers can be received, for the long-lighting ONU and permanently turning off the laser, the isolation of the long-emitting ONU in the GPON system is realized. To ensure the business security of the GPON system.

DRAWINGS

Figure 1 is a flow chart of the OLT discovering the ONU and establishing an online ONU table and authorizing the ONU table; Figure 2 is a flow chart for detecting the working state of the PON port;

Figure 3 is a flow chart for isolating the long-lighting ONU;

Figure 4 is a flow chart of the processing of the Ploam message by the ONU.

detailed description

The present invention provides a method for isolating a long-lighting ONU in a GPON system. The OLT queries the serial numbers of all ONUs in the GPON system according to a certain time interval, and sends a PLAOM message to turn off and delay all ONUs one by one. When the laser of the ONU is turned off, the OLT starts to query other ONU serial number commands to determine whether the current ONU is a long-emitting ONU based on whether the OLT can receive the serial number of other ONU responses when the current ONU laser is turned off. Judging result, when the judgment result indicates that the ONU is a long-lighting ONU The laser of the ONU is permanently turned off by sending a PLAOM message.

The invention will now be described in detail in conjunction with the drawings.

As a preferred embodiment of the present invention, a method for isolating a long-lighting ONU in a GPON system includes a process in which an OLT obtains an ONU serial number SN and establishes an online ONU table and an authorized ONU table, a PON port working state detection process, and detects long-lighting. The ONU and isolation process is a three-step process.

As shown in Figure 1, the OLT obtains the serial number SN of the ONU and establishes the online ONU table and authorizes the ONU table as follows:

In the GPON system, the OLT first queries the serial numbers of all ONUs in the GPON system by sending standard PLOAM messages at a certain frequency. The n ONUs that are online but not activated respond to the PLOAM messages and report their serial numbers SN1, SN2.. .... SNn. The activated ONU will not respond to the SN query message. If there is a long-emitting ONU, there will be no ONU under the PON port. After receiving the serial number of the ONU, the OLT reports it to the NMS. The NMS checks the validity of all reported ONUs one by one, and then determines whether to authorize the ONUs of the corresponding SNs. Based on this, two tables are established on the OLT: Authorized ONUs and Online ONU table. The SN information of all legal ONUs is saved to the authorized ONU table in the above process (these ONUs may be online or may not be online); the SN information of the currently online ONUs is saved to the online ONU table (these ONUs are online) Some have been authorized, and some may be newly discovered ONUs that have not yet been authorized.

The PON port connected to the ONU has three working states: normal working state, abnormal working state, and indeterminate state. The abnormal working status means that the PON port is not working properly, for example, a LOS alarm is generated. The indeterminate state means that the PON port cannot be determined to work normally, for example, the state after all the ONUs are normally offline. The PON port does not need to start the detection process of the long-lighting ONU under normal working conditions, but the normal working state and the uncertain state need to pass. The RSSI optical power detection module is used to determine if there is an ONU online.

The PON port working status detection process is shown in Figure 2.

When the PON port is in the normal working state, if an abnormality occurs (such as a LOS alarm is generated), the PON port enters an abnormal working state (the OLT detects the LOS alarm). At this time, the RSSI is started to perform the power of the PON port. Measurement, if the RSSI detects an optical signal, and the PON port at this time is in an abnormal working state, indicating that there may be a long-emitting ONU, it is necessary to start the detection of the long-emitting ONU. If the optical power is 0, the PON port is in an indeterminate state. At this time, the OLT periodically polls the SN of the ONU to see if the SN of the ONU can be obtained or activates the ONU. If not, the RSSI is started again to check whether the PON port is available. Optical signal; If the ONU can be found, the PON port returns to the normal working state, otherwise it is not the ONU online. To avoid additional CPU overhead, long-light ONU detection is not required for normal operation and for indeterminate states.

When the PON port is in an abnormal working state, the long-light ONU detection and isolation are started. The specific steps are shown in Figure 3. The PLOAM message format and ONU status used in the long-lighting ONU detection and isolation process are defined in Table 1 and Table 2. .

The method of isolating long-lighting ONUs is as follows:

A10. The OLT periodically queries the serial numbers of all ONUs, that is, the OLT periodically issues an instruction for querying the serial numbers of all ONUs in the GPON system through standard PLOAM messages, and establishes an online ONU table and an authorized ONU table.

A20. The OLT first turns off and then delays turning on all the ONU lasers in the GPON system according to the received serial number of the ONU. After the ONU laser is turned off, the OLT starts to query other ONU serial number commands, and When the current ONU laser is turned off, the OLT can receive the serial number of the other ONU reply, and obtain the judgment result of whether the current ONU is a long-light ONU. When the judgment result indicates that the ONU is a long-light ONU, The laser of the ONU is permanently turned off by sending a PLAOM message until the detailed steps of completing all the steps A20 are as follows:

A201. The OLT first reads the first ONU in the authorized ONU table, and the initial state of the ONU is 01;

A202: Send a PLOAM message with a command ID of DISABLE (OxFF) to the ONU according to the SN of the ONU. After receiving the PLOAM message, the ONU returns to the 07 state and turns off the laser.

A203. The OLT issues an instruction for querying the serial numbers of other ONUs through a standard PLAOM message.

A204. Since the ONU that has turned off the laser does not affect the operation of other ONUs, after a delay, if the OLT can obtain the serial number SN of the other ONU reply, it can be determined that the ONU that the laser is turned off is the long-emitting ONU. The OLT then permanently shuts down the laser of the ONU by sending a PLAOM message, and reports the SN of the ONU at the same time, and the detection ends. Conversely, if the OLT still cannot obtain the serial number of other ONU responses after the delay waits, it indicates that there is still a long-emitting ONU in the GPON system, and the ONU that is turned off by the laser is not a long-emitting ONU (because the laser of the ONU is turned off) Since the unknown long-emitting ONU is still emitting light, no serial number SN or activated ONU is found on the OLT side. At this time, the OLT sends a PLOAM message with the command ID ENABLE to the ONU, enabling the ONU, turns on the laser that is turned off, and returns it to the 02 state or the 03 state.

A205. The OLT continues to read the next ONU in the authorized ONU table, and repeats steps A202-A204 until the long-emitting ONU is found and isolated.

If a long-emitting ONU is not found in the authorized ONU table, the long-emitting ONU is not obtained. The authorized ONU needs to detect the ONU in the ONU of the online table at this time. Similar to the detection of the authorized ONU, first, the OLT reads the SN of the ONU in the online ONU table, and if the SN is not empty, sends a PLOAM message with the command ID DISABLE for the first ONU in the online ONU table, the ONU The initial state is 01. After receiving the PLOAM message, the ONU returns to the 07 state and turns off its laser. At the same time, the OLT issues a message for querying other ONU serial numbers SN. Similarly, after waiting for the delay, if the OLT can find the ONU or activate the ONU, the ONU whose serial number is SN is a long-lighting ONU. The OLT permanently turns off the laser of the ONU by sending a PLAOM message, and reports the SN of the ONU. If the ONU is not found or the ONU is activated after the delay, the ONU is not a long-emitting ONU. The OLT sends a PLOAM message with the command ID of ENABLE to the ONU, indicating that the ONU is not a long-emitting ONU. Then, the PLOAM message with the command ID of ENABLE is sent, the ONU is enabled, and the laser that is turned off is turned on to return to the 02 state or the 03 state. After that, the SN of the next ONU in the online ONU table is read, until the online ONU table is polled, and the long-emitting ONU is found and isolated.

If no long-lighting ONU is found in the online ONU table and the authorized ONU table, the OLT first sends all the ONUs to the broadcast PLOAM message, and the command ID of the PLOAM message is DISABLE. After all the ONUs receive the PLOAM message, Go back to the 07 state and turn off its laser. Then the OLT traverses the authorized ONU table, and sends a PLOAM message with the command ID ENABLE to each authorized ONU one by one to enable the ONU. After receiving the PLOAM message with the command ID ENABLE, the ONU turns on the laser and starts working, and returns from 07. 02 state, re-ranging, active to 05 state, normal operation. However, this method can only isolate the long-lighted ONU and cannot locate the long-illuminated 0NU serial number. Table 1

Table 2: ONU State Definition

Onu state definition

01 state initial state

02 status Standby status

03 Status Serial Number Status

04 status Ranging status

05 status Operating status

06 status POPUP status

07 state emergency stop state In the above steps, the process of processing the PLOAM message by the ONU is as shown in FIG. 4.

C10. After receiving the PLOAM message from the OLT, the ONU first determines whether the PLOAM message is a DISABLE SN message according to the content of the MESSAGE ID in the PLOAM message, and ignores the PLOAM message if it is not a DISABLE SN message; if it is a DISABLE SN message, Go to step C20.

C20. Determine whether the PLOAM is a broadcast message according to the content of the ONU ID in the PLOAM message. If it is a broadcast message, go to step C50; otherwise, go to step C30.

C30. Determine whether the SN of the ONU carried in the PLOAM message matches its own SN. If the SN does not match, the ONU of the OLT that wants the DISABLE is not itself, and the ONU does not perform any operation; otherwise, the message is sent to itself. Go to step C40.

C40. Determine whether the command ID in the PLOAM message is DISABLE or ENABLE. If it is ENABLE, the ONU turns on its laser. If it is DISABLE, the ONU turns off its laser.

The invention is based on the standard PLOAM message implementation. The PLOAM message is a standard defined by G.984.3. The PLOAM message is responsible for implementing ONU registration and ID assignment, ranging, port ID assignment, encryption, status detection, and bit error rate monitoring. During long-lighting ONU detection isolation, the ONU laser is turned on and off by a PLOAM message.

The present invention is not limited to the above-described preferred embodiments, and any structural changes made by the present invention in light of the teachings of the present invention are intended to be within the scope of the present invention.

Claims

Claim

A method for isolating a long-lighting ONU in a GPON system, comprising the steps of: A10: The OLT periodically queries the serial numbers of all ONUs;

A20. The OLT first turns off and then delays turning on all the ONU lasers in the GPON system according to the received serial number of the ONU. After the ONU laser is turned off, the OLT queries the serial numbers of other ONUs, and When the current ONU laser is turned off, the OLT can receive the serial number of the other ONU reply, and obtain the judgment result of whether the current ONU is a long-light ONU. When the judgment result indicates that the ONU is a long-lighting ONU, the PLAOM message is sent. The mode permanently turns off the ONU's laser until all ONUs are completed.

The method of isolating a long-lighting ONU in a GPON system according to claim 1, wherein in step A10, the OLT establishes an authorized ONU table and an online ONU table according to the obtained serial number of the ONU; First, the authorized ONU table is traversed first, and all the ONUs in the table are first turned off and then delayed to turn on the laser. If the judgment result indicates that there is no long-emitting ONU in the authorized ONU table, then the online ONU table is traversed again, and the ONU in the table is Turn off the lasers one by one and then turn them off until all ONUs are completed.

The method of isolating a long-lighting ONU in a GPON system according to claim 2, wherein if the result of the determination in step A20 indicates that there is no long-emission ONU in both the authorized ONU table and the online ONU table, the OLT transmits the broadcast. The PLOAM message closes the lasers of all connected ONUs, then traverses the authorized ONU table, sends a PLOAM message to each ONU in a pair of tables, and turns on its laser.

A method of isolating a long-lighting ONU in a GPON system according to claim 1, 2 or 3, characterized in that the following steps are performed before step A10:

B10. The OLT detects the working state of the PON port.

B20, whether the PON port receives a LOS alarm to obtain whether the PON port is in a normal working state. The judgment result of the state, when the judgment result indicates that the PON port is in a normal working state, then go to step B10; otherwise, go to step B30;

B50, the optical power is detected again by the RSSI. If the optical power is 0, the process goes to step B10; otherwise, the process goes to step A10.

The method for isolating a long-lighting ONU in a GPON system according to any one of claims 1 to 4, wherein the processing of the PLOAM message by the ONU in step A20 is as follows:

C10, after receiving the PLOAM message from the OLT, the ONU determines whether the PLOAM message is a DISABLE SN message, if not a DISABLE SN message, ignoring the PLOAM message; otherwise, proceeding to step C20;

C20, determining whether the PLOAM message is a broadcast message, if it is a broadcast message, proceeding to step C50; otherwise, proceeding to step C30;

C30, determining whether the SN of the ONU carried in the PLOAM message is consistent with its own SN, if not, do nothing; otherwise, go to step C40;