CN102263587B - The optical port changing method and system of optical network unit - Google Patents

Abstract

The invention discloses a method and system for switching optical ports of an optical network unit. The optical network unit includes a first optical port that is currently a working optical port and a second optical port that is currently a standby optical port. The method is as follows: the first optical port Send the status information of the second optical port to the optical line terminal regularly; when the first optical port fails, the optical line terminal judges whether the second optical port is currently available according to the status information of the second optical port; when the second optical port is currently available, Then the optical line terminal sends an optical port switching instruction to the optical network unit through the first optical port; the optical network unit switches the current working optical port to the second optical port according to the optical port switching instruction, and sets the first optical port as the standby optical port. mouth. The method and system of the present invention realize the optical port switching of the optical network unit, ensure the normal operation of the optical network unit, and simplify the optical port switching operation flow of the optical network unit.

Description

Optical port switching method and system of optical network unit

technical field

The invention relates to the technical field of optical networks, in particular to an optical port switching method and system of an optical network unit.

Background technique

With the rapid development of optical fiber access technology, it has become one of the hot technologies in the world. After nearly 20 years of development, Passive Optical Network (PON) technology has become an important direction for the development of access layer network transformation technology of "light into copper and back". The access layer network technology of "optical in copper out" is mostly constructed through the FTTB (Fiber to The Building, fiber to the building) mode, in which the optical network unit (ONU) is an important network node device in the FTTB construction mode. In the passive optical network (GPON) system, the PLOAM (Physical Layer Operations Administration and Maintenance, physical layer operation management and maintenance) interactive mode of the optical network unit is used to realize the optical network management.

In the prior art, in order to realize the optical port protection switching of the optical network unit in the gigabit passive optical network system, the SDH (Synchronous Digital Hierarchy, synchronous digital system) network protection framework mechanism is adopted. In this mechanism, the optical network unit And the optical line terminal (OLT) is considered as a peer-to-peer device, and the optical port switching of the optical network unit needs to be realized through K1/K2 byte coding. The network layout of an optical network unit.

Contents of the invention

The main purpose of the present invention is to provide a method and system for switching optical ports of an optical network unit, which realizes switching of optical ports of an optical network unit, ensures normal operation of the optical network unit, and simplifies the process of switching optical ports.

The present invention proposes a method for switching optical ports of an optical network unit, wherein the optical network unit includes a first optical port that is currently a working optical port and a second optical port that is currently a standby optical port, including steps:

The first optical port regularly sends status information of the second optical port to the optical line terminal;

When the first optical port fails, the optical line terminal judges whether the second optical port is currently available according to the state information of the second optical port;

When the second optical port is currently available, the optical line terminal sends an optical port switching instruction to the optical network unit through the first optical port;

The optical network unit switches the current working optical port to the second optical port according to the optical port switching instruction, and sets the first optical port as the standby optical port.

Preferably, the optical line terminal judges whether the first optical port fails in the following manner:

After receiving the state information of the second optical port, the optical line terminal starts the timing function to judge whether the state information of the next second optical port is received within the set time; if not, it indicates that the first optical port is faulty; If yes, it indicates that the first optical port is normal.

Preferably, the state of the second optical port includes: a state with an optical signal and a state without an optical signal.

Preferably, the optical line terminal judges whether the second optical port is available according to the status information of the second optical port as follows:

The optical line terminal judges whether the current state of the second optical port is a state of having an optical signal according to the state information of the second optical port;

When the current state of the second optical port is the state of optical signal, it means that the second optical port is available;

When the current state of the second optical port is a state of no optical signal, it indicates that the second optical port is unavailable.

Preferably, the status information of the second optical port is the latest status information of the second optical port received by the optical line terminal.

The present invention also proposes an optical port switching system for an optical network unit, including an optical network unit and an optical line terminal; the optical network unit includes a first optical port that is currently a working optical port and a second optical port that is currently a standby optical port ;

The first optical port is used to regularly send status information of the second optical port to the optical line terminal;

The optical line terminal is used to determine whether the second optical port is currently available according to the state information of the second optical port when the first optical port fails; The network unit sends an optical port switching command;

The optical network unit is used to switch the current working optical port to the second optical port according to the optical port switching instruction, and configure the first optical port as a backup optical port.

Preferably, the optical line terminal is specifically further configured to start a timer function after receiving the status information of the second optical port, and judge whether the status information of the next second optical port is received within the set time, and if not , it indicates that the first optical port is faulty; if it is, it indicates that the first optical port is normal.

Preferably, in the optical port switching system of the optical network unit, the state of the second optical port includes: a state with an optical signal and a state without an optical signal.

Preferably, the optical line terminal is specifically further configured to judge whether the current state of the second optical port is a state with optical signals according to the state information of the second optical port; when the current state of the second optical port is a state with optical signals , it means that the second optical port is available; when the current state of the second optical port is no optical signal, it means that the second optical port is unavailable.

Preferably, the status information of the second optical port is the latest status information of the second optical port received by the optical line terminal.

In the optical port switching method and system of the optical network unit provided by the present invention, the optical network unit regularly sends the state information of the standby optical port to the optical line terminal through the working optical port, and when the working optical port fails, the optical line terminal determines the standby optical port The optical port switching command of the backward optical network unit can be used, and the optical network unit switches the working optical port according to the optical port switching command, which realizes the optical port switching of the optical network unit, ensures the normal operation of the optical network unit, and simplifies the optical network. The optical port switching operation flow of the unit.

Description of drawings

Fig. 1 is the flow chart of an embodiment of the optical port switching method of the optical network unit of the present invention;

FIG. 2 is a schematic structural diagram of an embodiment of the optical port switching system of the optical network unit of the present invention.

The realization of the purpose of the present invention, functional characteristics and advantages will be further described in conjunction with the embodiments and with reference to the accompanying drawings.

detailed description

It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

Referring to FIG. 1 , an embodiment of an optical port switching method of an optical network unit of the present invention is proposed, and the optical network unit includes a first optical port that is currently a working optical port and a second optical port that is currently a standby optical port. The methods include:

Step S101, the first optical port regularly sends status information of the second optical port to the optical line terminal;

Step S102, when the first optical port fails, the optical line terminal judges whether the second optical port is currently available according to the state information of the second optical port; when the second optical port is currently available, then go to step S103; if not, end process.

Step S103, the optical line terminal sends an optical port switching instruction to the optical network unit through the first optical port;

Step S104, the optical network unit switches the current working optical port to the second optical port according to the optical port switching instruction, and sets the first optical port as a backup optical port.

The optical port switching instruction packet also includes the serial number of the target optical port, and the optical network unit can find the corresponding target optical port according to the serial number, and switch the working optical port to the target optical port. For example, the serial number of the target optical port in this embodiment is the serial number of the second optical port.

In the above-mentioned embodiment of the optical port switching method of the optical network unit, the prerequisite for optical port switching is that the first optical port and the second optical port of the optical network unit are registered with the optical line terminal respectively, and the registration is successful. After successful registration of the first and second optical ports, the optical network unit selects one of the optical ports as the working optical port, and selects the other as the standby optical port. If the first optical port is selected as the working optical port, the second optical port is selected as the standby optical port.

Further, in the above embodiment of the optical port switching method of the optical network unit, the optical line terminal judges whether the first optical port fails in the following manner: after receiving the status information of the second optical port, the optical line terminal starts the timing Timing function, judging whether the status information of the next second optical port is received within the set time; if not, it indicates that the first optical port is faulty; if so, it indicates that the first optical port is normal.

In the above embodiment of the optical port switching method of the optical network unit, the failure of the first optical port means that the first optical port cannot send data to the optical line terminal, but the optical line terminal can still send data to the optical line terminal through the first optical port. Send data to the optical network unit.

Further, in the above embodiment of the optical port switching method of the optical network unit, the state of the second optical port includes: a state with an optical signal and a state without an optical signal. In this embodiment, the state of the second optical port can be represented by numbers, for example, "1" indicates that the second optical port is in the state of having an optical signal, such as "0" indicates that the second optical port is in the state of not having an optical signal.

Further, in the above-mentioned embodiment of the optical port switching method of the optical network unit, the step S103 is specifically: the optical line terminal judges whether the current state of the second optical port is a state of having an optical signal according to the state information of the second optical port; When the current state of the second optical port is a state with optical signals, it means that the second optical port is available; when the current state of the second optical port is a state without optical signals, it means that the second optical port is unavailable.

Further, in the above embodiment of the optical port switching method of the optical network unit, the state information of the second optical port is the state information of the second optical port currently received by the optical line terminal last time.

The optical port switching method of the optical network unit described above is applicable to the network layout in which an optical line terminal corresponds to an optical network unit, and is also applicable to the network layout in which an optical line terminal corresponds to a plurality of optical network units.

In the above-mentioned embodiment of the optical port switching method of the optical network unit, the optical network unit regularly sends the status information of the standby optical port to the optical line terminal through the working optical port, and when the working optical port fails, the optical line terminal determines that the standby optical port is available for backward optical The network unit optical port switching command, the optical network unit switches the working optical port according to the optical port switching command, realizes the optical port switching of the optical network unit, ensures the normal operation of the optical network unit, and simplifies the optical port of the optical network unit Switch operation flow.

Referring to FIG. 2 , an embodiment of an optical port switching system 100 for an optical network unit of the present invention is proposed, including an optical network unit 110 and an optical line terminal 120 . The optical network unit 110 includes a first optical port 111 that is currently a working optical port and a second optical port 112 that is currently a standby optical port. The first optical port 111 is used to regularly send status information of the second optical port 112 to the optical line terminal. The optical line terminal 120 is used to determine whether the second optical port 112 is currently available according to the state information of the second optical port 112 when the first optical port 111 fails; and when the second optical port 112 is currently available, the optical line terminal 120 Send an optical port switching instruction to the optical network unit through the first optical port 111. The optical network unit 110 is configured to switch the current working optical port to the second optical port 112 according to the optical port switching instruction, and set the first optical port 111 as a standby optical port.

The optical port switching instruction packet also includes the serial number of the target optical port, and the optical network unit can find the corresponding target optical port according to the serial number, and switch the working optical port to the target optical port. For example, the serial number of the target optical port in this embodiment is the serial number of the second optical port 112 .

In the above-mentioned embodiment of the optical port switching method of the optical network unit 110, the prerequisite for optical port switching is that the first optical port 111 and the second optical port 112 of the optical network unit 110 are registered with the optical line terminal 120 respectively, and respectively All registered successfully. After the first and second optical ports are successfully registered, the optical network unit 110 selects one of them as the working optical port and the other as the standby optical port. If the first optical port 111 is selected as the working optical port, the second optical port 112 is selected as the standby optical port.

Further, in the above-mentioned embodiment of the optical port switching system 100 of the optical network unit, the optical line terminal 120 is specifically used to start the timer function after receiving the status information of the second optical port 112, and judge whether If the status information of the next second optical port 112 is received, if no, it indicates that the first optical port 111 is faulty; if it is, it indicates that the first optical port 111 is normal. In the above embodiment of the optical port switching method of the optical network unit, the failure of the first optical port 111 means that the first optical port 111 cannot send data to the optical line terminal 120, but the optical line terminal 120 can still pass through the first optical port 111. The optical port 111 sends data to the optical network unit 110 .

Further, in the above-mentioned optical port switching system of the optical network unit, the state of the second optical port 112 includes: a state with an optical signal and a state without an optical signal. In this embodiment, the state of the second optical port 112 can be represented by numbers, such as "1" indicating that the second optical port 112 is in the state of having an optical signal, such as "0" indicating that the second optical port 112 is in the state of not having an optical signal .

Further, in the above-mentioned embodiment of the optical port switching system 100 of the optical network unit, the optical line terminal 120 is specifically used to determine whether the current state of the second optical port 112 is optical or not according to the status information of the second optical port 112. The state of the signal; when the current state of the second optical port 112 is the state of optical signal, it means that the second optical port 112 is available; when the current state of the second optical port 112 is the state of no optical signal, it means that the second optical port 112 unavailable.

Further, in the above-mentioned embodiment of the optical port switching system 100 of the optical network unit, the state information of the second optical port 112 is the state information of the second optical port 112 currently received by the optical line terminal 120 last time.

The ONU optical port switching system 100 described above is applicable to a network layout in which one OLT 120 corresponds to an ONU 110 , and is also applicable to a network layout in which an OLT 120 corresponds to a plurality of ONUs 110 .

In the above-mentioned embodiment of the optical port switching system 100 of the optical network unit, the optical network unit regularly sends the state information of the standby optical port to the optical line terminal 120 through the working optical port, and when the working optical port fails, the optical line terminal 120 determines that the standby optical port is available Backward to the optical network unit 110 optical port switching instruction, the optical network unit 110 performs the mode of working optical port switching according to the optical port switching instruction, which realizes the optical port switching of the optical network unit 110, ensures the normal operation of the optical network unit 110, and simplifies The optical port switching operation flow of the optical network unit 110 is shown.

The following uses an ONU of the MDU (Multiple Dwelling Unit, multi-user dwelling unit) type as an example to illustrate the specific implementation process.

1. Design of Boolean quantity of optical port state

Different combinations of different Boolean quantities can represent different states of different optical modules on the ONU, and the PON MAC chip can use the different states corresponding to these different optical modules to realize the optical port protection of the ONU. Each optical port has two states: working state ACT and optical signal state SD, so these 4 state booleans can be divided into 2 groups, one group is PON_LT0_ACT and PON_LT0_SD, corresponding to the working (protection) optical module, and the other group PON_LT1_ACT and PON_LT1_SD correspond to protection (working) optical modules. These two sets of state Booleans are provided by the hardware complex programmable logic device CPLD, and are obtained from the CPLD in real time from the on-board support package BSP interface, so that for non-working ports, the SD state can be determined by the combination of these two sets of state Booleans Sure. When PON_LT0 is working, its (PON_LT0_ACT, PON_LT0_SD) value is (1,1), and the PON_LT1_ACT of the non-working port is 0. At this time, the SD value of the non-working port is the PON_LT1_SD value. If the SD value is 0, it means that the current cannot Execute the protection switching function, if the SD value is 1, it means that the protection switching is possible. See Table 1 for the Boolean value of the SD state of the non-working port.

Table 1 BSP interface provides real-time status

2. Design an OMCI (ONT Management and Control Interface, ONT Management and Control Interface) management entity TypeC force data

In order to facilitate message interaction between OLT and ONU, a TypeC force data management entity is designed in the form of OMCI management entity specified in ITU-G.984.4. The attribute line number of the entity represents the optical path number, which is related to the master and backup of ONU and OLT Corresponding to the set parameter line number for protection switching of the port, this management entity automatically notifies the current non-working port SD status to the OLT through an attribute value change AVC (Attribute Value Change) message.

Attribute description of the management entity TypeC force data:

Managed Entity ID: 0. (2 bytes)

Inactive fiber status: The status of the non-working optical port, which is used by the OLT to determine whether a PST message can be sent to request the ONU to switch to the non-working optical port when the mandatory protection condition occurs. If the current protection optical port has no optical signal, set to 0, otherwise set to 1. (1 byte)

3.ONU optical port switching

When the ONU receives the PST message of the optical port switching command PLOAM message family, it indicates that the non-working port has an optical signal, and the BSP interface can be used to immediately (nanosecond level) switch to the non-working port, that is, the optical port corresponding to the line number , the value of line number 0 or 1 indicates that the OLT requests the ONU to switch to the optical link of optical module 1 or the optical link of optical module 2 through a PST message, respectively.

Various real-time state parameters corresponding to the present invention can be acquired by the BSP from the hardware GPIO or CPLD register.

It should be understood that the above are only preferred embodiments of the present invention, and cannot therefore limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the description of the present invention and the contents of the accompanying drawings, or directly or indirectly used in Other relevant technical fields are all equally included in the patent protection scope of the present invention.

Claims (6)

1. a kind of optical port switching method of optical network unit, described optical network unit comprises the first optical port that is currently working optical port and the second optical port that is currently standby optical port, it is characterized in that, comprises steps: The first optical port regularly sends status information of the second optical port to the optical line terminal; When the first optical port fails, the optical line terminal judges whether the second optical port is currently available according to the state information of the second optical port; When the second optical port is currently available, the optical line terminal sends an optical port switching instruction to the optical network unit through the first optical port; The optical network unit acquires the serial number of the second optical port according to the optical port switching instruction, switches the current working optical port to the second optical port based on the serial number of the second optical port, and sets the first optical port as a backup optical port; Wherein, the optical line terminal judges whether the second optical port is available according to the status information of the second optical port as follows: The optical line terminal judges whether the current state of the second optical port is a state of having an optical signal according to the state information of the second optical port; When the current state of the second optical port is the state of optical signal, it means that the second optical port is available; The state information of the second optical port is the state information of the second optical port currently received by the optical line terminal last time. 2. The optical port switching method of the optical network unit according to claim 1, wherein the optical line terminal judges whether the first optical port fails in the following manner: After receiving the state information of the second optical port, the optical line terminal starts the timing function to judge whether the state information of the next second optical port is received within the set time; if not, it indicates that the first optical port is faulty; If yes, it indicates that the first optical port is normal. 3. The optical port switching method of the optical network unit according to claim 1 or 2, wherein when the current state of the second optical port is a state of no optical signal, it means that the second optical port is unavailable. 4. An optical port switching system of an optical network unit, characterized in that it comprises an optical network unit and an optical line terminal; the optical network unit comprises a first optical port that is currently a working optical port and a second optical port that is currently a standby optical port Optical port; The first optical port is used to regularly send status information of the second optical port to the optical line terminal; The optical line terminal is used to determine whether the second optical port is currently available according to the state information of the second optical port when the first optical port fails; The network unit sends an optical port switching command; The optical network unit is used to obtain the serial number of the second optical port according to the optical port switching instruction, switch the current working optical port to the second optical port based on the serial number of the second optical port, and set the first optical port as a backup optical port; Wherein, the optical line terminal is specifically further configured to judge whether the current state of the second optical port is a state with an optical signal according to the state information of the second optical port; when the current state of the second optical port is a state with an optical signal, It means that the second optical port is available; the status information of the second optical port is the status information of the second optical port currently received by the optical line terminal last time. 5. The optical port switching system of the optical network unit according to claim 4, characterized in that, The optical line terminal is also specifically used to start the timer function after receiving the status information of the second optical port, and judge whether the status information of the next second optical port is received within the set time, and if not, it indicates The first optical port fails; if so, it indicates that the first optical port is normal. 6. The optical port switching system of the optical network unit according to claim 4 or 5, wherein when the current state of the second optical port is a state of no optical signal, it means that the second optical port is unavailable.