WO2011085576A1 - 实现分布式保护的方法、无源光网络系统及光线路终端 - Google Patents

实现分布式保护的方法、无源光网络系统及光线路终端 Download PDF

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Publication number
WO2011085576A1
WO2011085576A1 PCT/CN2010/074402 CN2010074402W WO2011085576A1 WO 2011085576 A1 WO2011085576 A1 WO 2011085576A1 CN 2010074402 W CN2010074402 W CN 2010074402W WO 2011085576 A1 WO2011085576 A1 WO 2011085576A1
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WIPO (PCT)
Prior art keywords
interface
primary
optical
card
protection
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PCT/CN2010/074402
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English (en)
French (fr)
Inventor
陈洁云
卢金树
黄文杰
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中兴通讯股份有限公司
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Application filed by 中兴通讯股份有限公司 filed Critical 中兴通讯股份有限公司
Priority to EP10842860.8A priority Critical patent/EP2528271A4/en
Publication of WO2011085576A1 publication Critical patent/WO2011085576A1/zh

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J3/00—Time-division multiplex systems
    • H04J3/16—Time-division multiplex systems in which the time allocation to individual channels within a transmission cycle is variable, e.g. to accommodate varying complexity of signals, to vary number of channels transmitted
    • H04J3/1694—Allocation of channels in TDM/TDMA networks, e.g. distributed multiplexers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J3/00—Time-division multiplex systems
    • H04J3/02—Details
    • H04J3/14—Monitoring arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0062—Network aspects
    • H04Q11/0067—Provisions for optical access or distribution networks, e.g. Gigabit Ethernet Passive Optical Network (GE-PON), ATM-based Passive Optical Network (A-PON), PON-Ring
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0062—Network aspects
    • H04Q2011/0079—Operation or maintenance aspects
    • H04Q2011/0081—Fault tolerance; Redundancy; Recovery; Reconfigurability

Definitions

  • the present invention relates to the field of communications technologies, and in particular, to a method for implementing distributed protection in a passive optical network (PON), a passive optical network system, and an optical line terminal.
  • PON passive optical network
  • passive optical network system a passive optical network system
  • optical line terminal an optical line terminal
  • BACKGROUND Passive optical networks include Ethernet PON (EPON), Gigabit PON (GPON), and Next Generation PON (NG-PON).
  • the passive optical network uses a point-to-multipoint fiber access technology, which consists of an optical line terminal (OLT) at the central office, an optical network unit (ONU) on the user side, and an OLT connected to the OLT. It is composed of an Optical Distribution Network (ODN) of the ONU.
  • OLT optical line terminal
  • OLT optical network unit
  • OLT Optical Distribution Network
  • the protection mechanism of the passive optical network is mainly used to enhance the reliability of the fiber access network.
  • the protection types mainly include Type B (TYPE B) protection and Type C (TYPE C) protection.
  • the B-type protection uses the OLT backup interface and the backup trunk fiber between the OLT backup interface and the ODN.
  • the OLT When the OLT working interface is damaged or the trunk optical fiber connection between the OLT interface and the ODN is interrupted, the OLT automatically performs protection switching, and switches to On the OLT backup interface, to re-establish the Fibre Channel between the OLT backup interface and the ONU; and the C-type protection uses the OLT backup interface, the backup trunk fiber between the OLT backup interface and the ODN, and the ONU standby interface and the ONU standby interface.
  • the backup branch fiber between the OLT and the ODN when the OLT working interface and the working ONU interface are damaged, or any fiber connection between the OLT working interface, the ODN, and the working ONU interface is interrupted, the OLT performs protection switching and switches to the OLT.
  • the standby interface and the ONU standby interface are used to re-establish the fiber path between the OLT backup interface and the ONU standby interface.
  • PON protection technology can be used for protection switching to quickly restore communication services.
  • An OLT device generally includes an active switching board and multiple line cards for carrying PON services.
  • the OLT interface is located on the line card.
  • the OLT device is connected to the ONU device through the OLT interface on the line card.
  • the current PON protection is implemented by the main control switch board of the optical line terminal, by collecting alarms, running protection algorithms, and using inter-board message notification to enable the line card to perform protection operations, that is, the traditional centralized PON protection mode.
  • the protection method is that the line card passes the first inter-board message, and the alarm of the OLT interface or the ONU interface is reported to the main control switch board, and the protection algorithm is run by the main control switch board, and the specific protection switching method is obtained by the protection algorithm.
  • the protection functions are centralized on the main control switch board, and the OLT device usually only has one working main control switch board, if only one master control switch If the board is abnormal, the PON protection function will be completely disabled.
  • the service interruption time (protection switching service recovery time) caused by the PON protection switch is very short.
  • the traditional centralized protection mode line card needs to be in the first. When an inter-board message is sent, the alarm is reported to the main control switch board. Therefore, there is a scheduling delay for the main control switch board to report the alarm message on the line card.
  • the number of internal line cards increases.
  • the inter-board messages received by the main control switch board from different line cards will also increase, so that when the communication between the OLT working interface and the ONU interface is interrupted, and the protection switching occurs, the main control switch board is connected to the line card.
  • the increase in the scheduling time of the reported alarm message will result in an increase in the recovery time of the protection switching service. Way there will be an inevitable bottleneck time, does not meet the operator requirements for PON protection switching service restoration time.
  • the technical problem to be solved by the present invention is to provide a method for implementing distributed protection, a passive optical network system, and an optical line terminal, which can shorten the recovery time of service protection and improve the service protection capability of the optical line terminal.
  • the present invention provides a method for implementing distributed protection, including: The line card of the optical line terminal detects that the primary interface is damaged or the service carried on the primary interface is interrupted, and the protection switching is performed to Switch to the standby interface by using the communication service carried on the interface.
  • the step of detecting, by the line card of the optical line terminal, that the primary interface is damaged or the service carried on the primary interface is interrupted comprises: the line card detecting that the trunk path communication between the primary interface and the optical distribution network is interrupted;
  • the step of protecting the switch includes: using the protection algorithm to obtain the active interface as the standby interface, the inactive port as the primary interface, closing the inactive port, and opening the activation port, and switching the communication service carried on the primary interface to the standby. On the interface.
  • the line card of the optical line terminal detects that the primary interface is damaged or is carried on the primary interface.
  • the step of interrupting the service includes: the online card of the primary interface detects that the trunk channel communication between the primary interface and the optical distribution network is interrupted; and the step of performing the protection switching includes: obtaining the activation interface as a backup interface by using the protection algorithm, The activation port is a primary interface, and the inactive port is closed, and a protection switching message is sent to the online card of the activation port, where the online card receives the protection switching message and then opens the standby interface, The communication service carried on the primary interface is switched to the standby interface.
  • the primary interface and the standby interface of the optical network unit are mutually protected, the first interface of the optical line terminal connected to the primary interface of the optical network unit, and the second optical interface terminal connected to the standby interface of the optical network unit are second. If the interface is located in the same line card; the line card of the optical line terminal detects that the primary interface is damaged or the service carried on the primary interface is interrupted: the line card detects the first interface of the optical line terminal and the optical network The communication between the primary interface of the unit is interrupted.
  • the step of performing the protection switching includes: obtaining the active interface as the standby interface by using the protection algorithm, and the inactive interface is the primary interface, and the second interface connected to the activation port is protected.
  • the switching message is sent to the optical network unit, and after receiving the protection switching message, the optical network unit performs handover by itself, and switches the communication service carried on the primary interface to the standby interface.
  • the primary interface and the standby interface of the optical network unit are mutually protected, the first interface of the optical line terminal connected to the primary interface of the optical network unit, and the second optical interface terminal connected to the standby interface of the optical network unit are second.
  • the interface is located in the case of different line cards;
  • the step of detecting that the main interface is damaged or the service carried on the main interface is interrupted by the line card of the optical line terminal includes: the first interface of the first interface detects the first interface of the optical line terminal and the main interface of the optical network unit The communication is interrupted.
  • the steps of performing the protection switching include: obtaining the activation interface as the standby interface by using the protection algorithm, and the inactive interface is the primary interface, and sending the protection switching message that needs to be sent to the optical network unit to the connection with the activation port.
  • the online card of the second interface receives the protection switching message and sends the message to the optical network unit. After receiving the protection switching message, the optical network unit switches itself to switch the communication service carried on the primary interface to On the alternate interface.
  • the present invention further provides a passive optical network system for implementing distributed protection, including an optical line terminal, the optical line terminal including one or more line cards; wherein: a line card of the optical line terminal
  • the device is configured to: detect that the primary interface is damaged or the service carried on the primary interface is interrupted, and perform protection switching to switch the communication service carried on the primary interface to the standby interface.
  • the line card In the B-type protection mode, when the optical line terminal main interface and the optical line terminal backup interface are mutually protected and located in the same line card; the line card is set to detect that the main interface is damaged or used as follows: The service carried on the interface is interrupted: the trunk path communication between the primary interface and the optical distribution network is detected to be interrupted; the line card is configured to perform protection switching as follows: the activation interface is obtained as a backup interface by the protection algorithm The inactive port is the primary interface, the inactive port is closed, and the activation port is opened, and the communication service carried on the primary interface is switched to the standby interface.
  • the line card of the optical line terminal includes the online card of the main interface and the online card of the standby interface;
  • the online card of the primary interface is configured to detect that the primary interface is damaged or the service carried on the primary interface is interrupted as follows: detecting trunk communication between the primary interface and the optical distribution network Interrupt
  • the online card of the primary interface is configured to perform protection switching as follows: the activation interface is obtained as a backup interface by using a protection algorithm, and the inactive interface is a primary interface, and the inactive port is closed, and the activation port is closed.
  • the online card sends a protection switching message; the online card of the standby interface is configured to perform the protection switching as follows: after receiving the protection switching message, the standby interface is opened, and the communication service carried on the primary interface is switched to the standby On the interface.
  • the system further includes an optical network unit; in the C-type protection mode, the primary interface and the backup interface of the optical network unit are mutually protected, and the first interface of the optical line terminal connected to the primary interface of the optical network unit and the optical network unit
  • the line card of the optical line terminal includes the online card of the first interface and the online card of the second interface
  • the card is configured to detect that the primary interface is damaged or the service carried on the primary interface is interrupted as follows: the communication between the first interface of the optical line terminal and the primary interface of the optical network unit is detected to be interrupted;
  • the online card of the interface and the online card of the second interface are configured to perform the protection switching as follows: the activation interface is the backup interface through
  • the interface sends a protection switching message to the optical network unit; the optical network unit is configured to: after receiving the protection switching message, perform the cutting by itself Change the communication service carried on the primary interface to the standby interface.
  • the system further includes an optical network unit.
  • the primary interface and the backup interface of the optical network unit are mutually protected, and the first interface of the optical line terminal connected to the primary interface of the optical network unit and the optical network unit
  • the line card of the optical line terminal includes the online card of the first interface and the online card of the second interface;
  • the card is configured to detect that the primary interface is damaged or the service carried on the primary interface is interrupted as follows: the communication between the first interface of the optical line terminal and the primary interface of the optical network unit is detected to be interrupted;
  • the online card of the interface is configured to perform protection switching as follows:
  • the activation interface is the backup interface through the protection algorithm, and the inactive interface is the primary interface.
  • the protection switching message sent to the optical network unit is sent to the active interface.
  • the online card of the second interface connected to the interface;
  • the online card of the second interface is configured to perform protection switching according to the following manner: sending, by the second interface, a protection switching message received from the online card of the first interface to the optical network unit;
  • the optical network unit is configured to: after receiving the protection switching message, perform the handover by itself, and switch the communication service carried on the primary interface to the standby interface.
  • the present invention further provides an optical line terminal for implementing distributed protection, comprising: one or more line cards, wherein: the line card is set to: detecting that the primary interface is damaged or the primary interface is detected. The service carried on the primary interface is interrupted, and the protection switching is performed to switch the communication service carried on the primary interface to the standby interface.
  • the line card In the B-type protection mode, when the optical line terminal main interface and the optical line terminal backup interface are mutually protected and located in the same line card; the line card is set to detect that the main interface is damaged or used as follows: The service carried on the interface is interrupted: the trunk path communication between the primary interface and the optical distribution network is detected to be interrupted; the line card is configured to perform protection switching as follows: the activation interface is obtained as a backup interface by the protection algorithm The inactive port is the primary interface, the inactive port is closed, and the activation port is opened, and the communication service carried on the primary interface is switched to the standby interface.
  • the line card of the optical line terminal includes the online card of the main interface and the online card of the standby interface;
  • the online card of the primary interface is configured to detect that the primary interface is damaged or the service carried on the primary interface is interrupted as follows: detecting trunk communication between the primary interface and the optical distribution network
  • the online card of the primary interface is configured to perform protection switching as follows: The activation interface is obtained as a backup interface by using a protection algorithm, and the inactive interface is a primary interface, the inactive port is closed, and the activation is performed.
  • the online card sends a protection switching message; the online card of the standby interface is set to perform protection switching as follows: After the switching message is protected, the standby interface is opened, and the communication service carried on the primary interface is switched to the standby interface.
  • the primary interface and the backup interface of the optical network unit are mutually protected, the first interface of the optical line terminal connected to the primary interface of the optical network unit, and the second optical interface terminal connected to the standby interface of the optical network unit are second.
  • the line card of the optical line terminal includes the online card of the first interface and the online card of the second interface;
  • the online card of the first interface is configured to be detected as follows
  • the primary interface is damaged or the service carried on the primary interface is interrupted: the communication between the first interface of the optical line terminal and the primary interface of the optical network unit is detected to be interrupted; the first interface is the online card and the second interface
  • the online card is configured to perform the protection switching as follows: the activation interface is obtained as a backup interface by the protection algorithm, and the inactive port is the primary interface, and the protection switching message is sent to the second interface through the second interface connected to the activation port.
  • the optical network unit so that after receiving the protection switching message, the optical network unit performs handover by itself, and cuts the communication service carried on the primary interface. Switch to the alternate interface.
  • the primary interface and the standby interface of the optical network unit are mutually protected, the first interface of the optical line terminal connected to the primary interface of the optical network unit, and the optical line terminal connected to the standby interface of the optical network unit
  • the line card of the optical line terminal includes the online card of the first interface and the online card of the second interface;
  • the online card of the first interface is configured to be detected as follows
  • the main interface is damaged or the service carried on the active interface is interrupted: the communication between the first interface of the optical line terminal and the primary interface of the optical network unit is detected to be interrupted; the online card of the first interface is set to press
  • the protection switching is performed as follows: The protection interface is used as the standby interface, and the inactive interface is the primary interface.
  • the protection switching message sent to the optical network unit is sent to the second interface connected to the active interface, that is, the standby interface.
  • the card of the second interface is configured to perform protection switching as follows: the first interface will be from the first interface
  • the line card receiving the protection switching message to the optical network unit Therefore, after receiving the protection switching message, the optical network unit performs handover by itself, and switches the communication service carried on the primary interface to the standby interface.
  • the disadvantage of the centralized protection is mainly because the PON protection function of the OLT device is mainly implemented by the main control switch board, and the distributed protection method in the present invention moves the PON protection function from the main control switch board to the line card, and the line card.
  • the detection alarm, the operation protection algorithm, and the protection switching operation are implemented to solve the single point failure problem caused by using the unique main control switch board to implement PON protection in the centralized protection method.
  • the distributed protection of the present invention even if the main control switch board fails, the PON protection function can be operated normally.
  • the distributed protection is a line card to implement the protection function, the line card does not need to report the detected alarm to the main control.
  • the switch board so there is no inter-board communication between the line card and the main control switch board, and there is no scheduling delay of the main control switch board for the line card alarm message, thereby eliminating the protection switching time existing in the centralized protection mode. Bottlenecks, shorten the recovery time of service protection, and improve the service protection capability of optical line terminals to meet the needs of operators.
  • FIG. 1 is a flow chart of a method for implementing distributed protection in an embodiment
  • FIG. 2 is a flowchart of processing a distributed protection optical line terminal device for a type B protection group
  • FIG. 3 is a distributed protection optical line for a type C protection group.
  • Figure 4 is a connection diagram of a Type B protection OLT device and an ONU device in the first embodiment
  • Figure 5 is a connection diagram of a Type C protection OLT device and an ONU device in the second embodiment.
  • a passive optical network system for implementing distributed protection includes an optical line terminal and an optical network unit, and the optical line terminal includes one or more line cards.
  • the line card of the optical line terminal is set to: After detecting that the primary interface is damaged or the service carried on the primary interface is interrupted, the protection switching is performed, and the communication service carried on the primary interface is switched to the standby interface.
  • the optical line terminal primary interface and the optical line terminal backup interface are mutually protected and located in the same line card; the optical line termination line card is set to: between the primary interface and the optical distribution network is detected After the trunk path communication is interrupted, the activation port is obtained by the protection algorithm as the standby interface, and the inactive port is the primary interface, and the inactive port is closed, that is, the active interface is opened, and the activation port is opened. And the standby interface switches the communication service carried on the optical interface of the optical line terminal to the optical line terminal backup interface.
  • the optical line terminal primary interface and the optical line terminal backup interface are mutually protected and located in different line cards; the primary interface network card is set to: the primary interface and the optical distribution network are detected.
  • the activation interface is obtained by the protection algorithm as the standby interface, and the inactive port is the primary interface, and the inactive interface is closed, that is, the active interface, and the active interface is
  • the online card of the standby interface sends a protection switching message.
  • the online card of the standby interface is configured to: open the standby interface after receiving the protection switching message, and switch the communication service carried on the primary interface to the standby interface.
  • the optical network unit main interface and the optical network unit backup interface are mutually protected, and the optical line terminal first interface connected to the optical network unit main interface and the optical line terminal connected to the optical network unit backup interface
  • the second interface is located in the same line card; the first interface and the second interface are set to: after detecting that the communication between the first interface of the optical line terminal and the primary interface of the optical network unit is interrupted, the protection algorithm obtains The activation port is the standby interface, and the inactive port is the primary interface, and the protection switching message is sent to the optical network unit by using the second interface connected to the activation interface, that is, the standby interface.
  • the optical network unit is configured to: after receiving the protection switching message of the optical line terminal, switch the communication service carried on the primary interface to the standby interface.
  • the optical network unit main interface and the optical network unit standby interface are mutually protected, the optical line terminal first interface connected to the optical network unit main interface, and the optical line terminal connected to the optical network unit backup interface.
  • the interface is located in a different line card.
  • the online card of the first interface is configured to: after detecting that the communication between the first interface of the optical line terminal and the primary interface of the optical network unit is interrupted, the activation port is obtained by using a protection algorithm.
  • the standby interface, the inactive port is the primary
  • the interface sends the protection switching message that needs to be sent to the optical network unit to the activation card, that is, the online card of the second interface to which the standby interface is connected.
  • the online card of the second interface is configured to: send, by using the second interface, a protection switching message received from the online card of the first interface to the optical network unit.
  • the optical network unit is configured to: after receiving the protection switching message of the optical line terminal, switch the communication service carried on the primary interface to the standby interface.
  • the embodiment further provides an optical line terminal for implementing distributed protection, including: one or more line cards, where: the line card is configured to: detect that the primary interface is damaged or the service carried on the primary interface is interrupted, A protection switch is performed to switch the communication service carried on the primary interface to the standby interface.
  • the line card In the ⁇ type protection mode, when the optical line terminal main interface and the optical line terminal backup interface are mutually protected and located in the same line card; the line card is set to detect that the main interface is damaged or the main interface is as follows: The bearer service is interrupted: the trunk channel communication between the primary interface and the optical distribution network is interrupted.
  • the line card is set to perform protection switching as follows: The activation algorithm is used as the backup interface through the protection algorithm, and the inactive interface is the primary interface.
  • the line card of the optical line terminal includes the online card of the main interface and the online card of the standby interface;
  • the online card of the primary interface is configured to detect that the primary interface is damaged or the service carried on the primary interface is interrupted as follows: the trunk channel communication interruption between the primary interface and the optical distribution network is detected;
  • the online card of the active interface is configured to perform protection switching as follows:
  • the activation interface is the standby interface through the protection algorithm, and the inactive interface is the primary interface, the inactive port is closed, and the online card is sent to the activation port to protect.
  • the online card of the standby interface is configured to perform the protection switching as follows: After receiving the protection switching message, the standby interface is opened, and the communication service carried on the primary interface is switched to the standby interface.
  • the primary interface and the backup interface of the optical network unit are mutually protected, the first interface of the optical line terminal connected to the primary interface of the optical network unit, and the second optical interface terminal connected to the standby interface of the optical network unit are second.
  • the line card of the optical line terminal includes the online card of the first interface and the online card of the second interface;
  • the online card of the first interface is configured to detect that the primary interface is damaged as follows: Or the service carried on the primary interface is interrupted: the communication between the first interface of the optical line terminal and the primary interface of the optical network unit is detected to be interrupted; the online card of the first interface and the online card of the second interface are set to press
  • the protection switching is performed in the following manner: the activation interface is the standby interface, and the inactive interface is the primary interface, and the protection switching message is sent to the optical network unit through the second interface connected to the activation interface, thereby enabling the optical network.
  • the unit switches itself to switch the communication service carried on the primary interface to the standby interface.
  • the primary interface and the standby interface of the optical network unit are mutually protected, the first interface of the optical line terminal connected to the primary interface of the optical network unit, and the optical line terminal connected to the standby interface of the optical network unit
  • the line card of the optical line terminal includes the online card of the first interface and the online card of the second interface;
  • the online card of the first interface is configured to detect the primary interface as follows: The service carried on the damaged or active interface is interrupted: the communication between the first interface of the optical line terminal and the primary interface of the optical network unit is detected to be interrupted;
  • the online card of the first interface is configured to perform the protection switching as follows:
  • the activation interface is the backup interface through the protection algorithm, and the inactive interface is the primary interface, and the protection switching message sent to the optical network unit is sent to the activation interface. That is, the second interface of the standby interface is connected to the online card; the second interface is configured to perform the protection switching as follows:
  • the protection switch message received from the online card of the first interface is sent to the optical network through the second interface. Unit, so that after receiving the protection switching message, the optical network unit switches itself and uses the primary connection.
  • the communication service carried on the interface is switched to the standby interface.
  • the method for implementing the distributed protection includes: the line card of the optical line terminal detects that the primary interface is damaged or the service carried on the primary interface is interrupted, performs protection switching, and performs communication services carried on the primary interface. Switch to the alternate interface.
  • the optical line terminal equipment is divided into different protection types, namely B type protection and C type protection.
  • Type B protection refers to the protection of OLT interface redundancy, and the OLT interface is switched at the granularity. It is not limited to the way of connecting through the N: 2 splitter, but also the way of 2:1 splitter and 1:N splitter, but the final effect needs to be through multiple ONUs through a single splitter or multiple
  • the cascading of the splitter is connected to the two OLT interfaces.
  • the method for implementing distributed protection in the B-type protection mode includes: Step 201: Create a B-type protection group, for example, add two OLT interfaces to the protection group, one of which is a primary interface, and the other is The standby interface is in the same state as the primary interface and the standby interface is in the cold backup state. If two mutually protected OLT interfaces are on the same line card, they are the same type B protection.
  • Step 202 The line card where the primary interface is located detects that the trunk path communication between the primary interface and the optical distribution network is interrupted. Specifically, when the trunk path communication of the primary interface is interrupted, the line card detects the alarm.
  • Step 203 The line card execution protection algorithm obtains the activation interface as the standby interface, and the inactive interface is the primary interface.
  • Step 204 The line card determines whether the primary interface and the standby interface are located on the same line card. If yes, go to step 205; otherwise, go to step 206.
  • Step 205 The active card of the primary interface closes the inactive interface, that is, the active interface, and opens the active interface, that is, the standby interface, and switches the communication service carried on the active interface of the optical line terminal to On the standby interface of the optical line terminal, the B-type protection switching is completed, and the process ends.
  • Step 206 The online card of the primary interface closes the inactive interface, that is, the primary interface, and sends an inter-board message, that is, a protection switching message, to the online card of the standby interface, which is the active interface, by the inter-board communication mechanism between the line card and the line card, and notifies the standby message.
  • the interface line card operates on the standby interface.
  • Step 207 After receiving the protection switching message, the online card of the standby interface opens the standby interface, and switches the service carried on the primary interface to the standby interface to complete the B-type protection switching.
  • the method for implementing distributed protection in the C-type protection mode includes: Step 301: Create a C-type protection group, for example, add two ONU interfaces to the protection group, one of which is a primary interface, and the other is The backup interface is connected to the two OLT interfaces (called the first interface and the second interface) through different ODNs. The service is carried on the primary interface and the standby interface is in the hot backup state. If the two OLT interfaces are on the same line card, they are the same type C protection. If they are on different line cards, they are cross-board C-type protection.
  • Step 302 The line card where the OLT interface (ie, the first interface) connected to the primary interface of the ONU is located detects that the communication between the first interface and the primary interface of the ONU is interrupted. Specifically, the first interface and the primary interface of the ONU are used. When the communication is interrupted, the OLT interface connected to the primary interface of the ONU, that is, the line card where the first interface is located, detects an alarm.
  • Step 303: The online card of the first interface obtains the activation interface as the standby interface, and the inactive interface is the primary interface, and generates a handover protection message to be sent to the ONU.
  • the handover protection message is specifically a K1/K2 protocol byte.
  • Step 304 Determine whether the first interface connected to the primary interface and the second interface connected to the standby interface are located on the same line card. If yes, go to step 305; otherwise, go to step 306.
  • Step 305 The online card of the first interface sends the protection switching message to the ONU through the second interface connected to the active interface, that is, the standby interface. After receiving the message, the ONU switches the service carried on the primary ONU interface to the standby ONU.
  • Step 306 The online card of the first interface sends the protection switching message sent to the optical network unit to the online card of the second interface connected to the active interface, that is, the standby interface, by using the inter-board communication mechanism between the line card and the line card.
  • the online card of the second interface sends the protection switching message received by the online card of the first interface to the ONU through the second interface.
  • the ONU switches the service carried on the primary ONU interface to the standby ONU interface. , Complete the C type protection switch.
  • the OLT device includes a main control switch board and multiple line cards, wherein the OLT interface PON1 of the line card 1 and The OLT interface PON2 is connected to the ONUu to the ONU 1N through the N:2 optical splitter 1.
  • Step 1 Create a B-type protection group P1, set the OLT interface PON1 of the line card 1 as the primary interface, and set the OLT interface PON2 of the line card 1 as the standby interface (this When the primary interface is open and the standby interface is closed, the communication service carried on the primary interface is normal, and the standby interface is in the cold backup state. Because the primary interface and the backup interface are both on the same line card, the protection mode is the same. Type B protection.
  • Step 2 When the physical line between the primary interface on the line card 1 and the optical splitter 1 is interrupted (the service is also interrupted), the line card 1 immediately detects the alarm and runs a protection algorithm to calculate the protection switch.
  • the active port is the standby interface, and the active port is not the primary interface.
  • Step 3 The line card 1 first turns off the inactive port (that is, the primary interface), and then turns on the activation port (that is, the standby interface), and then interrupts the service on the primary interface and immediately resumes on the standby interface. From 1 to 3, the same type B distributed protection is implemented.
  • Step 4 Create a B-type protection group P2, set the OLT interface 4 of the line card 1 as the primary interface, and set the OLT interface 4 of the line card N as the standby interface (the primary interface opens the standby interface at this time), the primary interface
  • the communication service carried on the interface is normal, and the standby interface is in the cold backup state. Because the primary interface and the standby interface are not on the same line card, this protection mode is cross-board type B protection.
  • Step 5 When the physical line between the primary interface on the line card 1 and the optical splitter 2 is interrupted (the service is also interrupted), the line card 1 immediately detects the alarm and runs a protection algorithm to calculate the PON protection switch.
  • the activation port is the standby interface, and the active port is the primary interface.
  • Step 6 The line card 1 first closes the inactive port (ie, the main interface) of the line card, and then sends the inter-board message to the line card N, informing the line card N to open the activation port on the line card (ie, the standby interface) After the line card N receives the message, the standby interface is opened, and then the service interrupted on the primary interface is immediately restored on the standby interface.
  • the cross-board B-type distributed protection is implemented through steps 4 to 6.
  • the OLT device includes a main control switch board and multiple line cards, and the OLT interface PON1 of the line card 1 passes through the N.
  • the optical splitter 1 is connected to the ONU interface 1 of the ONU device 1.
  • the OLT interface PON2 of the line card 1 is connected to the ONU interface PON2 of the ONU device 1 through the N:l splitter 2, and the OLT interface PON4 of the line card 1 passes N:
  • the optical splitter 3 is connected to the ONU interface 1 of the ONU device 3.
  • the OLT interface PON1 of the line card N is connected to the ONU interface 2 of the ONU device 3 through the N:1 splitter 4.
  • Step 1 Create the C-type protection group P1, set the ONU interface 1 of the ONU device 1 as the primary interface, and set the ONU interface 2 as the standby interface.
  • the communication service carried on the interface is normal, and the standby interface is in the hot backup state.
  • the OLT interface connected to the primary interface and the standby interface is on the same line card. Therefore, the protection mode is the same type C protection.
  • Step 2 When the physical line between the primary interface and the optical splitter 1 is interrupted (the service is also interrupted), the line card 1 connected to the primary interface immediately detects the alarm, and runs a protection algorithm to calculate that the active interface is the standby interface.
  • the non-active port is the primary interface, and the K1/K2 protocol byte passed to the ONU device 1 is also calculated.
  • Step 3 Since the protection group P1 is the same type C protection, the line card 1 can send the K1/K2 protocol byte to the OLT interface PON2 of the line card 1 to the activation interface calculated in step 2, that is, the standby interface, to notify the ONU.
  • the device 1 performs protection switching. After the ONU device 1 receives the K1/K2 protocol byte for switching, the ONU side protection switch can be performed, and the service on the primary interface is interrupted. The interface is restored. Through steps 1 to 3, the same type C distributed protection of the protection group P1 is implemented.
  • Step 4 Create the C-type protection group P2, set the ONU interface 1 of the ONU device 3 as the primary interface, and set the ONU interface 2 as the standby interface.
  • the communication service carried on the primary interface is normal, and the standby interface is in the hot backup state.
  • the OLT interfaces connected to the primary and backup interfaces are located on different line cards, so this protection is cross-board C-type protection.
  • Step 5 When the physical line between the primary interface and the optical splitter 3 is interrupted (the service is also interrupted), the line card 1 connected to the primary interface immediately detects the alarm, and runs a protection algorithm to calculate the activation port after the protection switch. It is a standby interface.
  • the inactive port is the primary interface, and the K1/K2 bytes sent to the ONU device 3 are calculated at the same time.
  • Step 6 Since the OLT interface connected to the active interface calculated in step 5 is the line card N, the line card 1 sends the protocol K1/K2 byte to the line card N through the inter-board message, and the line card N After receiving the message, the protocol byte is sent to the ONU device 3 through the OLT interface 1. The ONU device 3 receives the K1/K2 protocol byte for ONU side protection switching, and then interrupts the recovery of the primary interface service on the standby interface. Through steps 4 to 6, the cross-board C-type distributed protection of the protection group P2 is realized.
  • the present invention implements a distributed protection method for the B-type and C-type protection groups respectively, that is, the optical line communication interruption alarm is obtained through the line card of the optical line terminal, the protection algorithm is executed, and the protection operation is performed, that is, the PON is implemented.
  • the protection function is implemented on the line card carrying various services of the optical line terminal equipment, and the centralized protection strategy that originally implements the protection function on the single main control switch board is changed.
  • the distributed protection method can avoid the single-point failure caused by the complete use of the main control switch board in the centralized protection, and in the distributed protection, the line card is not required to transmit the alarm message to the main control switch board.
  • there is no scheduling delay of the main control switch board for the line card alarm message which shortens the recovery time of the PON protection switching service.
  • the distributed protection method of the present invention can avoid the single-point failure problem caused by the complete use of the main control switch board in the centralized protection to achieve protection switching, and in the distributed protection, the line card is not required to transmit the alarm message.
  • On the main control switch board there is no scheduling delay of the main switch board to the line card alarm message, which shortens the recovery time of the PON protection switch service.

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Abstract

一种实现分布式保护的方法，包括：光线路终端的线卡检测到主用接口损坏或主用接口上承载的业务出现中断，执行保护切换，以将主用接口上承载的通信业务切换到备用接口上。一种实现分布式保护的无源光网络系统，包括光线路终端，所述光线路终端包括一个或多个线卡，其中：光线路终端的线卡设置为：检测到主用接口损坏或主用接口上承载的业务出现中断，执行保护切换，以将主用接口上承载的通信业务切换到备用接口上。本发明还提供了一种实现分布式保护的光线路终端。本发明可以避免集中式保护中完全使用主控交换板来实现保护切换而引起的单点失效问题，缩短了PON保护切换业务恢复时间。

Description

实现分布式保护的方法、 无源光网络系统及光线路终端
技术领域 本发明涉及通讯技术领域， 尤其涉及在无源光网络 （Passive Optical Networks, 简称 PON ) 中实现分布式保护的方法、 无源光网络系统及光线路 终端。
背景技术 无源光网络包括以太无源光网络（ Ethernet PON, 简称 EPON ) , 吉比特 无源光网络（ Gigabit PON ,简称 GPON ) ,下一代无源光网络（ Next Generation PON, NG-PON )等。 无源光网络釆用一种点到多点的光纤接入技术， 由局 端的光线路终端 （Optical Line Terminal, 简称 OLT ) 、 用户侧的光网络单元 ( Optical Network Unit, 简称 ONU ) 以及连接 OLT和 ONU的光分配网络 ( Optical Distribution Network, 简称 ODN )组成。 无源光网络的保护机制主 要用于增强光纤接入网的可靠性， 保护类型主要包括 B型 （TYPE B )保护 和 C型 （TYPE C )保护。 其中 B型保护通过使用 OLT备用接口以及 OLT备用接口与 ODN之间 的备用主干光纤， 在 OLT工作接口损坏或 OLT接口与 ODN之间的主干光 纤连接中断时， 由 OLT 自行发生保护倒换， 切换到 OLT备用接口上， 以便 重新建立由 OLT备用接口到 ONU之间的光纤通路； 而 C型保护通过使用 OLT备用接口， OLT备用接口与 ODN之间的备用主干光纤， 以及 ONU备 用接口、 ONU备用接口与 ODN之间的备用分支光纤， 在 OLT工作接口及 工作 ONU接口损坏， 或者 OLT工作接口、 ODN以及工作 ONU接口之间的 任何一段光纤连接发生中断时， 由 OLT 自行发生保护倒换， 切换到 OLT备 用接口以及 ONU备用接口上， 以便重新建立由 OLT备用接口到 ONU备用 接口之间的光纤通路。 当 OLT与 ONU之间出现通信中断时， 可使用 PON 保护技术来进行保护切换， 以便迅速恢复通信业务。
OLT设备中一般包含一块主用交换板和多块用于承载 PON业务的线卡， 主控交换板与线卡之间通过板间消息机制进行消息互通， OLT接口位于线卡 上， OLT设备通过线卡上的 OLT接口与 ONU设备相连接。 目前的 PON保 护是由光线路终端的主控交换板， 通过釆集告警、 运行保护算法以及使用板 间消息通知并使线卡执行保护操作来实现的，也就是传统的集中式 PON保护 方式， 其保护方法是首先线卡通过第一次板间消息， 将 OLT接口或 ONU接 口告警上报给主控交换板， 由主控交换板运行保护算法， 并通过该保护算法 得出具体的保护切换方法， 再通过第二次板间消息通知线卡保护切换的具体 实施方式， 最后由线卡执行保护切换操作。 这种方式存在缺陷， 首先在集中 式保护方式中，保护功能都集中实现在主控交换板上，并且 OLT设备通常情 况下只存在一块工作的主控交换板， 假如仅有的一块主控交换板出现异常， 会导致 PON保护功能完全失效； 其次， 目前运营商要求的由于 PON保护切 换而产生的业务间断时间 （保护切换业务恢复时间）非常短， 传统的集中式 保护方式线卡需在第一次板间消息时， 将告警上报给主控交换板， 因此存在 主控交换板对线卡上报告警消息的调度时延， 随着光线路终端设备容量日益 扩大， 设备内线卡数量日益增多， 主控交换板接收到的来自于不同线卡的板 间消息也将增多， 由此当 OLT工作接口与 ONU接口间的通信发生中断， 而 产生保护切换的瞬间，主控交换板对线卡上报的告警消息的调度时间的增长， 将导致保护切换业务恢复时间的增加， 因此集中式保护方式将存在不可避免 的时间瓶颈， 不满足运营商对 PON保护切换业务恢复时间的要求。
发明内容 本发明要解决的技术问题是提供实现分布式保护的方法、 无源光网络系 统及光线路终端， 缩短业务保护的恢复时间， 提高光线路终端的业务保护能 力。 为了解决上述问题， 本发明提供了一种实现分布式保护的方法， 包括： 光线路终端的线卡检测到主用接口损坏或主用接口上承载的业务出现中断， 执行保护切换， 以将主用接口上承载的通信业务切换到备用接口上。 在 B型保护方式中， 在光线路终端主用接口和光线路终端备用接口互为 保护且位于同一线卡的情况下； 光线路终端的线卡检测到主用接口损坏或主用接口上承载的业务出现中 断的步骤包括： 所述线卡检测到所述主用接口与光分配网络之间的主干通路 通信中断； 执行保护切换的步骤包括： 通过保护算法得到激活口为备用接口， 非激 活口为主用接口， 关闭所述非激活口， 并打开所述激活口， 将主用接口上承 载的通信业务切换到备用接口上。 在 B型保护方式中， 在光线路终端主用接口和光线路终端备用接口互为 保护且位于不同线卡的情况下； 光线路终端的线卡检测到主用接口损坏或主用接口上承载的业务出现中 断的步骤包括： 主用接口所在线卡检测到所述主用接口与光分配网络之间的 主干通路通信中断； 执行保护切换的步骤包括： 通过保护算法得到激活口为备用接口， 非激 活口为主用接口， 关闭所述非激活口， 并向所述激活口所在线卡发送保护切 换消息， 所述备用接口所在线卡接收到所述保护切换消息后打开所述备用接 口， 将主用接口上承载的通信业务切换到备用接口上。 在 C型保护类型中， 在光网络单元主用接口和备用接口互为保护， 与光 网络单元主用接口相连的光线路终端第一接口以及与光网络单元备用接口相 连的光线路终端第二接口位于同一线卡的情形下； 光线路终端的线卡检测到主用接口损坏或主用接口上承载的业务出现中 断的步骤包括： 所述线卡检测到光线路终端第一接口与光网络单元主用接口 之间的通信发生中断； 执行保护切换的步骤包括： 通过保护算法得到激活口为备用接口， 非激 活口为主用接口， 通过与激活口相连接的所述第二接口将保护切换消息发送 至所述光网络单元，所述光网络单元接收保护切换消息之后， 自行进行切换， 将主用接口上承载的通信业务切换到备用接口上。 在 C型保护类型中， 在光网络单元主用接口和备用接口互为保护， 与光 网络单元主用接口相连的光线路终端第一接口以及与光网络单元备用接口相 连的光线路终端第二接口位于不同线卡的情形下； 光线路终端的线卡检测到主用接口损坏或主用接口上承载的业务出现中 断的步骤包括： 所述第一接口所在线卡检测到光线路终端第一接口与光网络 单元主用接口之间的通信发生中断； 执行保护切换的步骤包括： 通过保护算法得到激活口为备用接口， 非激 活口为主用接口， 将需要向光网络单元发送的保护切换消息发送至与激活口 连接的第二接口所在线卡， 第二接口所在线卡接收到保护切换消息发送至光 网络单元， 所述光网络单元接收到保护切换消息之后， 自行进行切换， 将主 用接口上承载的通信业务切换到备用接口上。
为了解决上述技术问题， 本发明还提供了一种实现分布式保护的无源光 网络系统， 包括光线路终端， 所述光线路终端包括一个或多个线卡； 其中： 光线路终端的线卡设置为： 检测到主用接口损坏或主用接口上承载的业 务出现中断， 执行保护切换， 以将主用接口上承载的通信业务切换到备用接 口上。 在 B型保护方式中， 在光线路终端主用接口和光线路终端备用接口互为 保护且位于同一线卡的情况下； 所述线卡是设置为按如下方式检测到主用接口损坏或主用接口上承载的 业务出现中断：检测到所述主用接口与光分配网络之间的主干通路通信中断； 所述线卡是设置为按如下方式执行保护切换： 通过保护算法得到激活口 为备用接口， 非激活口为主用接口， 关闭所述非激活口， 并打开所述激活口， 将主用接口上承载的通信业务切换到备用接口上。 在 B型保护方式中， 光线路终端主用接口和光线路终端备用接口互为保 护且位于不同线卡的情况下， 光线路终端的线卡包括主用接口所在线卡和备 用接口所在线卡； 其中， 所述主用接口所在线卡是设置为按如下方式检测到主用接口损坏或主用 接口上承载的业务出现中断： 检测到所述主用接口与光分配网络之间的主干 通路通信中断； 所述主用接口所在线卡是设置为按如下方式执行保护切换： 通过保护算 法得到激活口为备用接口， 非激活口为主用接口， 关闭所述非激活口， 并向 所述激活口所在线卡发送保护切换消息； 所述备用接口所在线卡是设置为按如下方式执行保护切换： 接收到所述 保护切换消息后打开所述备用接口， 将主用接口上承载的通信业务切换到备 用接口上。 所述系统还包括光网络单元； 在 C型保护方式中， 在光网络单元主用接 口和备用接口互为保护， 与光网络单元主用接口相连的光线路终端第一接口 以及与光网络单元备用接口相连的光线路终端第二接口位于同一线卡的情形 下，所述光线路终端的线卡包括所述第一接口所在线卡和第二接口所在线卡； 所述第一接口所在线卡是设置为按如下方式检测到主用接口损坏或主用 接口上承载的业务出现中断： 检测到光线路终端第一接口与光网络单元主用 接口之间的通信发生中断； 所述第一接口所在线卡和第二接口所在线卡是设置为按如下方式执行保 护切换： 通过保护算法得到激活口为备用接口， 非激活口为主用接口， 通过 与激活口相连接的所述第二接口将保护切换消息发送至所述光网络单元； 所述光网络单元设置为： 接收保护切换消息之后， 自行进行切换， 将主 用接口上承载的通信业务切换到备用接口上。 所述系统还包括光网络单元； 在 C型保护方式中， 光网络单元的主用接 口和备用接口互为保护， 与光网络单元主用接口相连的光线路终端第一接口 以及与光网络单元备用接口相连的光线路终端第二接口位于不同线卡的情形 下，所述光线路终端的线卡包括所述第一接口所在线卡和第二接口所在线卡； 所述第一接口所在线卡是设置为按如下方式检测到主用接口损坏或主用 接口上承载的业务出现中断： 检测到光线路终端第一接口与光网络单元主用 接口之间的通信发生中断； 所述第一接口所在线卡是设置为按如下方式执行保护切换： 通过保护算 法得到激活口为备用接口， 非激活口为主用接口， 将需要向光网络单元发送 的保护切换消息发送至与激活口即备用接口连接的第二接口所在线卡； 所述第二接口所在线卡是设置为按如下方式执行保护切换： 通过所述第 二接口将从第一接口所在线卡接收到的保护切换消息发送至所述光网络单 元；
所述光网络单元设置为： 接收到保护切换消息之后， 自行进行切换， 将 主用接口上承载的通信业务切换到备用接口上。
为了解决上述技术问题， 本发明还提供了一种实现分布式保护的光线路 终端， 包括： 一个或多个线卡， 其中： 所述线卡设置为： 检测到主用接口损坏或主用接口上承载的业务出现中 断， 执行保护切换， 以将主用接口上承载的通信业务切换到备用接口上。 在 B型保护方式中， 在光线路终端主用接口和光线路终端备用接口互为 保护且位于同一线卡的情况下； 所述线卡是设置为按如下方式检测到主用接口损坏或主用接口上承载的 业务出现中断：检测到所述主用接口与光分配网络之间的主干通路通信中断； 所述线卡是设置为按如下方式执行保护切换： 通过保护算法得到激活口 为备用接口， 非激活口为主用接口， 关闭所述非激活口， 并打开所述激活口， 将主用接口上承载的通信业务切换到备用接口上。 在 B型保护方式中， 光线路终端主用接口和光线路终端备用接口互为保 护且位于不同线卡的情况下， 光线路终端的线卡包括主用接口所在线卡和备 用接口所在线卡； 其中， 所述主用接口所在线卡是设置为按如下方式检测到主用接口损坏或主用 接口上承载的业务出现中断： 检测到所述主用接口与光分配网络之间的主干 通路通信中断； 所述主用接口所在线卡是设置为按如下方式执行保护切换： 通过保护算 法得到激活口为备用接口， 非激活口为主用接口， 关闭所述非激活口， 并向 所述激活口所在线卡发送保护切换消息； 所述备用接口所在线卡是设置为按如下方式执行保护切换： 接收到所述 保护切换消息后打开所述备用接口， 将主用接口上承载的通信业务切换到备 用接口上。 在 C型保护方式中， 在光网络单元主用接口和备用接口互为保护， 与光 网络单元主用接口相连的光线路终端第一接口以及与光网络单元备用接口相 连的光线路终端第二接口位于同一线卡的情形下， 所述光线路终端的线卡包 括所述第一接口所在线卡和第二接口所在线卡； 所述第一接口所在线卡是设置为按如下方式检测到主用接口损坏或主用 接口上承载的业务出现中断： 检测到光线路终端第一接口与光网络单元主用 接口之间的通信发生中断； 所述第一接口所在线卡和第二接口所在线卡是设置为按如下方式执行保 护切换： 通过保护算法得到激活口为备用接口， 非激活口为主用接口， 通过 与激活口相连接的所述第二接口将保护切换消息发送至所述光网络单元， 从而使光网络单元接收保护切换消息之后， 自行进行切换， 将主用接口 上承载的通信业务切换到备用接口上。 在 C型保护方式中， 在光网络单元的主用接口和备用接口互为保护， 与 光网络单元主用接口相连的光线路终端第一接口以及与光网络单元备用接口 相连的光线路终端第二接口位于不同线卡的情形下， 所述光线路终端的线卡 包括所述第一接口所在线卡和第二接口所在线卡； 所述第一接口所在线卡是设置为按如下方式检测到主用接口损坏或主用 接口上承载的业务出现中断： 检测到光线路终端第一接口与光网络单元主用 接口之间的通信发生中断； 所述第一接口所在线卡是设置为按如下方式执行保护切换： 通过保护算 法得到激活口为备用接口， 非激活口为主用接口， 将需要向光网络单元发送 的保护切换消息发送至与激活口即备用接口连接的第二接口所在线卡； 所述第二接口所在线卡是设置为按如下方式执行保护切换： 通过所述第 二接口将从第一接口所在线卡接收到的保护切换消息发送至所述光网络单 元， 从而使所述光网络单元接收到保护切换消息之后， 自行进行切换， 将主 用接口上承载的通信业务切换到备用接口上。
集中式保护的缺点主要因为 OLT设备的 PON保护功能主要由主控交换 板来实现， 而本发明中的分布式保护方法，将 PON保护功能从主控交换板移 至线卡上， 由线卡检测告警、 运行保护算法， 实施保护切换操作， 以此来解 决集中式保护方法中的使用唯一主控交换板来实现 PON保护而引起的单点 失效问题。 在本发明的分布式保护中即使主控交换板出现故障， PON保护功 能也可以正常运行， 同时， 由于分布式保护是线卡实现保护功能， 即线卡不 用将检测到的告警上报给主控交换板， 因此不存在线卡与主控交换板之间的 板间通讯， 也就不存在主控交换板对线卡告警消息的调度时延， 从而消除集 中式保护方式中存在的保护切换时间瓶颈， 缩短业务保护的恢复时间， 提高 光线路终端的业务保护能力， 以满足运营商的需求。
附图概述 图 1是实施例中实现分布式保护的方法流程图； 图 2是 B型保护组实现分布式保护光线路终端设备处理流程图； 图 3是 C型保护组实现分布式保护光线路终端设备处理流程图； 图 4是具体实施例一中 B型保护 OLT设备与 ONU设备连接图； 图 5是具体实施例二中 C型保护 OLT设备与 ONU设备连接图。
本发明的较佳实施方式 本发明中， 一种实现分布式保护的无源光网络系统， 包括光线路终端和 光网络单元， 光线路终端包括一块或多块线卡。 光线路终端的线卡设置为： 检测到主用接口损坏或主用接口上承载的业 务出现中断后， 执行保护切换， 将主用接口上承载的通信业务切换到备用接 口上。 在 B型保护方式， 光线路终端主用接口和光线路终端备用接口互为保护 且位于同一线卡的情况下； 光线路终端线卡设置为： 检测到所述主用接口与 光分配网络之间的主干通路通信中断后， 通过保护算法得到激活口为所述备 用接口， 非激活口为所述主用接口， 关闭所述非激活口即所述主用接口并打 开所述激活口即所述备用接口， 将所述光线路终端主用接口上承载的通信业 务切换到所述光线路终端备用接口上。 在 B型保护方式， 光线路终端主用接口和光线路终端备用接口互为保护 且位于不同线卡的情况下； 主用接口所在线卡设置为： 检测到所述主用接口 与光分配网络之间的主干通路通信中断后， 通过保护算法得到激活口为所述 备用接口， 非激活口为所述主用接口， 关闭所述非激活口即所述主用接口， 并向所述激活接口即所述备用接口所在线卡发送保护切换消息。 备用接口所 在线卡设置为： 接收到所述保护切换消息后打开所述备用接口， 将所述主用 接口上承载的通信业务切换到所述备用接口上。
在 C型保护方式，光网络单元主用接口和光网络单元备用接口互为保护， 并且与光网络单元主用接口相连的光线路终端第一接口以及与光网络单元备 用接口相连的光线路终端第二接口位于同一线卡的情形下； 第一接口和第二 接口所在线卡设置为： 检测到光线路终端第一接口与光网络单元主用接口之 间的通信发生中断后， 通过保护算法得到激活口为所述备用接口， 非激活口 为所述主用接口， 通过与激活口即所述备用接口相连接的所述第二接口将保 护切换消息发送至所述光网络单元。 所述光网络单元设置为： 收到光线路终端的保护切换消息之后， 将承载 在所述主用接口上的通信业务切换到所述备用接口上。 在 C型保护方式，光网络单元主用接口和光网络单元备用接口互为保护， 与光网络单元主用接口相连的光线路终端第一接口以及与光网络单元备用接 口相连的光线路终端第二接口位于不同线卡的情形下； 所述第一接口所在线 卡设置为： 检测到光线路终端第一接口与光网络单元主用接口之间的通信发 生中断后， 通过保护算法得到激活口为所述备用接口， 非激活口为所述主用 接口， 将需要向光网络单元发送的保护切换消息发送至激活口即所述备用接 口所连接的第二接口所在线卡。 所述第二接口所在线卡设置为： 通过所述第 二接口将从第一接口所在线卡接收到的保护切换消息发送至所述光网络单 元。 所述光网络单元设置为： 收到光线路终端的保护切换消息之后， 将承载 在所述主用接口上的通信业务切换到所述备用接口上。
本实施例还提供了一种实现分布式保护的光线路终端， 包括： 一个或多 个线卡， 其中： 线卡设置为： 检测到主用接口损坏或主用接口上承载的业务出现中断， 执行保护切换， 以将主用接口上承载的通信业务切换到备用接口上。 在 Β型保护方式中， 在光线路终端主用接口和光线路终端备用接口互为 保护且位于同一线卡的情况下； 线卡是设置为按如下方式检测到主用接口损坏或主用接口上承载的业务 出现中断： 检测到主用接口与光分配网络之间的主干通路通信中断； 线卡是设置为按如下方式执行保护切换： 通过保护算法得到激活口为备 用接口， 非激活口为主用接口， 关闭非激活口， 并打开激活口， 将主用接口 上承载的通信业务切换到备用接口上。 在 Β型保护方式中， 光线路终端主用接口和光线路终端备用接口互为保 护且位于不同线卡的情况下， 光线路终端的线卡包括主用接口所在线卡和备 用接口所在线卡； 其中， 主用接口所在线卡是设置为按如下方式检测到主用接口损坏或主用接口 上承载的业务出现中断： 检测到主用接口与光分配网络之间的主干通路通信 中断；
主用接口所在线卡是设置为按如下方式执行保护切换： 通过保护算法得 到激活口为备用接口， 非激活口为主用接口， 关闭所述非激活口， 并向激活 口所在线卡发送保护切换消息； 备用接口所在线卡是设置为按如下方式执行保护切换： 接收到保护切换 消息后打开所述备用接口，将主用接口上承载的通信业务切换到备用接口上。 在 C型保护方式中， 在光网络单元主用接口和备用接口互为保护， 与光 网络单元主用接口相连的光线路终端第一接口以及与光网络单元备用接口相 连的光线路终端第二接口位于同一线卡的情形下， 光线路终端的线卡包括所 述第一接口所在线卡和第二接口所在线卡； 第一接口所在线卡是设置为按如下方式检测到主用接口损坏或主用接口 上承载的业务出现中断： 检测到光线路终端第一接口与光网络单元主用接口 之间的通信发生中断； 第一接口所在线卡和第二接口所在线卡是设置为按如下方式执行保护切 换： 通过保护算法得到激活口为备用接口， 非激活口为主用接口， 通过与激 活口相连接的所述第二接口将保护切换消息发送至光网络单元， 从而使光网络单元接收保护切换消息之后， 自行进行切换， 将主用接口 上承载的通信业务切换到备用接口上。 在 C型保护方式中， 在光网络单元的主用接口和备用接口互为保护， 与 光网络单元主用接口相连的光线路终端第一接口以及与光网络单元备用接口 相连的光线路终端第二接口位于不同线卡的情形下， 光线路终端的线卡包括 所述第一接口所在线卡和第二接口所在线卡； 第一接口所在线卡是设置为按如下方式检测到主用接口损坏或主用接口 上承载的业务出现中断： 检测到光线路终端第一接口与光网络单元主用接口 之间的通信发生中断；
第一接口所在线卡是设置为按如下方式执行保护切换： 通过保护算法得 到激活口为备用接口， 非激活口为主用接口， 将需要向光网络单元发送的保 护切换消息发送至与激活口即备用接口连接的第二接口所在线卡； 第二接口所在线卡是设置为按如下方式执行保护切换： 通过第二接口将 从第一接口所在线卡接收到的保护切换消息发送至光网络单元， 从而使光网络单元接收到保护切换消息之后， 自行进行切换， 将主用接 口上承载的通信业务切换到备用接口上。
如图 1所示， 实现分布式保护的方法包括： 光线路终端的线卡检测到主 用接口损坏或主用接口上承载的业务出现中断， 执行保护切换， 将主用接口 上承载的通信业务切换到备用接口上。 在光线路终端设备上分为不同保护类型， 分别是 B型保护和 C型保护。 B型保护指 OLT接口冗余的保护， 以 OLT接口为粒度进行切换。 不限于通 过 N: 2的分光器进行连接的方式， 也可以是 2:1分光器与 1 : N分光器级联 的方式， 但是最终的效果需要是通过多个 ONU通过单个分光器或者多个分 光器的级联与两个 OLT接口相连接， 只能是多个 ONU通过分光器与同一 OLT设备的 2个 PON接口相连。 C型保护指 OLT接口和 ONU接口冗余的 保护， 以 ONU接口为粒度进行切换。 如图 2所示， B型保护方式下实现分布式保护的方法包括： 步骤 201 , 创建 B型保护组， 例如将两个 OLT接口加入到保护组中， 其 中一个为主用接口， 另一个为备用接口； 主用接口和备用接口互为保护且与 ONU通过 ODN相连， 业务承载在主用接口上， 备用接口处于冷备份状态。 若两个互为保护的 OLT接口位于同一线卡上， 则为同板 B型保护， 若位于 不同线卡上， 则为跨板 B型保护。 步骤 202, 主用接口所在的线卡检测到主用接口与光分配网络之间的主 干通路通信中断； 具体的， 当主用接口连接的主干通路通信中断时， 线卡检 测到告警。 步骤 203 , 线卡执行保护算法得到激活口为所述备用接口， 非激活口为 所述主用接口。 步骤 204, 线卡判断主用接口与备用接口是否位于同一线卡， 如果是执 行步骤 205; 否则， 执行步骤 206。 步骤 205 , 主用接口所在线卡关闭非激活口即所述主用接口， 并打开激 活口即所述备用接口， 将所述光线路终端主用接口上承载的通信业务切换到 所述光线路终端备用接口上， 完成 B型保护切换， 结束。 步骤 206, 主用接口所在线卡关闭非激活口即主用接口， 通过线卡与线 卡间的板间通信机制向激活口即备用接口所在线卡发送板间消息即保护切换 消息， 通知备用接口线卡对备用接口进行操作。 步骤 207 , 备用接口所在线卡收到保护切换消息后打开备用接口， 将承 载在主用接口上的业务切换到备用接口上， 完成 B型保护切换。
如图 3所示， C型保护方式下实现分布式保护的方法包括： 步骤 301 , 创建 C型保护组， 例如将两个 ONU接口加入到保护组中， 其中一个为主用接口， 另一个为备用接口； 互为保护的两个 ONU接口通过 不同的 ODN分别与两个 OLT接口 （称为第一接口和第二接口）相连， 业务 承载在主用接口上， 备用接口处于热备份状态下。 若两个 OLT接口位于同 一线卡上， 则为同板 C型保护， 若位于不同线卡上， 则为跨板 C型保护。 步骤 302, 与 ONU主用接口相连的 OLT接口 （即第一接口）所在的线 卡检测到第一接口与 ONU主用接口的通路出现通信中断； 具体的， 第一接 口与 ONU主用接口的通路出现通信中断时， 与 ONU主用接口相连的 OLT 接口即第一接口所在的线卡检测到告警。 步骤 303 , 第一接口所在线卡通过保护算法得到激活口为备用接口， 非 激活口为主用接口， 并生成需发送到 ONU的切换保护消息， 此切换保护消 息具体为 K1/K2协议字节 （K1/K2协议是 OLT与 ONU进行通信的协议， K1字节是保护切换请求类型和保护切换请求信道号的组合， K2字节是保护 请求信道号， 保护架构模式和保护切换模式的组合） 。 步骤 304, 判断与主用接口相连的第一接口和与备用接口相连的第二接 口是否位于同一线卡， 如果是执行步骤 305; 否则， 执行步骤 306。 步骤 305 , 第一接口所在线卡通过与激活口即备用接口所连接的第二接 口将保护切换消息发送至 ONU; ONU收到消息后，将承载在主用 ONU接口 上的业务切换到备用 ONU接口上， 完成 C型保护切换。 步骤 306, 第一接口所在线卡通过线卡与线卡间的板间通信机制将需要 向光网络单元发送的保护切换消息发送至与激活口即备用接口所连接的第二 接口所在线卡， 第二接口所在线卡通过第二接口将从第一接口所在线卡接收 到的保护切换消息发送至 ONU, ONU收到消息后，将承载在主用 ONU接口 上的业务切换到备用 ONU接口上， 完成 C型保护切换。
以下结合附图举例说明本发明的具体实施方式。 具体实施例一： 在 B型保护方式中， OLT设备与 ONU设备的网络连接如图 4所示， 其 中 OLT设备包括一块主控交换板和多块线卡，其中线卡 1的 OLT接口 PON1 和 OLT接口 PON2通过 N:2分光器 1与 ONUu至 ONU1N相连，线卡 1的 OLT 接口 PON4和线卡 N的 OLT接口 PON4通过 N:2分光器 2与 ONU21至 ONU2N 相连， B型保护组的分布式保护由如下几个步骤来实现： 步骤 1 : 创建 B型保护组 P1 , 将线卡 1的 OLT接口 PON1设置为主用 接口， 线卡 1的 OLT接口 PON2设置为备用接口（此时主用接口打开且备用 接口关闭） ， 主用接口上承载的通信业务正常， 备用接口处于冷备份状态， 由于主用接口和备用接口均位于同一块线卡， 因此这种保护方式为同板 B型 保护。 步骤 2: 当线卡 1上的主用接口与分光器 1之间的物理线路中断时（业 务也中断） ， 此时线卡 1立刻检测到告警， 并运行保护算法， 计算出保护切 换之后的激活口为备用接口， 而非激活口为主用接口。 步骤 3: 线卡 1先将非激活口 （即主用接口） 关闭， 再将激活口 （即备 用接口）打开， 之后中断在主用接口上的业务就立刻在备用接口上恢复了， 通过步骤 1到步骤 3实现了同板 B型分布式保护。 步骤 4: 创建 B型保护组 P2, 将线卡 1的 OLT接口 4设置为主用接口， 线卡 N的 OLT接口 4设置为备用接口 （此时主用接口打开备用接口关闭）， 主用接口上承载的通信业务正常， 备用接口处于冷备份状态， 由于主用接口 和备用接口不在同一块线卡， 因此这种保护方式为跨板 B型保护。 步骤 5: 当线卡 1上的主用接口与分光器 2之间的物理线路中断时（业 务也中断） ， 此时线卡 1 立刻检测到告警， 并运行保护算法， 计算出 PON 保护切换后的激活口为备用接口， 而非激活口为主用接口。 步骤 6: 线卡 1先将位于本线卡的非激活口 （即主用接口） 关闭， 再发 送板间消息至线卡 N, 通知线卡 N打开该线卡上的激活口 （即备用接口） ， 线卡 N接收到消息之后打开备用接口，之后中断在主用接口上的业务就立刻 在备用接口上恢复了， 通过步骤 4到步骤 6实现了跨板 B型分布式保护。
具体实施例二： 在 C型保护场景中， OLT设备与 ONU设备的网络连接如图 5所示， 其 中 OLT设备包括一块主控交换板和多块线卡， 线卡 1的 OLT接口 PON1通 过 N:l分光器 1与 ONU设备 1的 ONU接口 1相连，线卡 1的 OLT接口 PON2 通过 N:l分光器 2与 ONU设备 1的 ONU接口 PON2相连接，线卡 1的 OLT 接口 PON4通过 N:l分光器 3与 ONU设备 3的 ONU接口 1相连， 线卡 N 的 OLT接口 PON1通过 N:l分光器 4与 ONU设备 3的 ONU接口 2相连。 C 型保护组的分布式保护由如下几个步骤来实现： 步骤 1 : 创建 C型保护组 P1 , 将 ONU设备 1的 ONU接口 1设置为主 用接口， ONU接口 2设置为备用接口， 主用接口上承载的通信业务正常， 备 用接口处于热备份状态，由于与主用接口和备用接口相连的 OLT接口位于同 一块线卡上， 因此这种保护方式为同板 C型保护。 步骤 2: 当主用接口与分光器 1之间的物理线路中断时（业务也中断）， 与主用接口相连的线卡 1立即检测到告警， 并运行保护算法， 计算出激活口 是备用接口， 而非激活口是主用接口， 并同时计算出传递给 ONU设备 1的 K1/K2协议字节。 步骤 3: 由于保护组 P1为同板 C型保护， 因此线卡 1可将 K1/K2协议 字节通过线卡 1的 OLT接口 PON2发送给步骤 2中计算出的激活口即备用接 口， 通知 ONU设备 1进行保护切换， ONU设备 1接收到 K1/K2协议字节进 行切换之后， 即可进行 ONU侧保护切换， 中断在主用接口上的业务就在备 用接口上恢复了，通过步骤 1至步骤 3 , 实现保护组 P1的同板 C型分布式保 护。 步骤 4: 创建 C型保护组 P2, 将 ONU设备 3的 ONU接口 1设置为主 用接口， ONU接口 2设置为备用接口， 主用接口上承载的通信业务正常， 备 用接口处于热备份状态，由于与主用接口和备用接口相连的 OLT接口位于不 同线卡上， 因此这种保护方式为跨板 C型保护。 步骤 5: 当主用接口与分光器 3之间的物理线路中断时（业务也中断）， 与主用接口相连的线卡 1立刻检测到告警， 并运行保护算法， 计算出保护切 换后的激活口是备用接口， 非激活口是主用接口， 并同时计算出发送给 ONU 设备 3的 K1/K2字节。 步骤 6: 由于与步骤 5中计算出的激活口即备用接口相连的 OLT接口位 于线卡 N上， 因此线卡 1将协议 K1/K2字节通过板间消息发送至线卡 N, 线 卡 N接收到消息之后， 将该协议字节通过 OLT接口 1发送至 ONU设备 3 , ONU设备 3接收到 K1/K2协议字节进行 ONU侧保护切换，之后中断在主用 接口业务就在备用接口上恢复了， 通过步骤 4至步骤 6, 实现保护组 P2的跨 板 C型分布式保护。
综上可见，本发明实例分别实现了 B型和 C型保护组的分布式保护方法 , 即通过光线路终端的线卡获取光线路通信中断告警， 运行保护算法并执行保 护操作 ,也就是将 PON保护功能实现在光线路终端设备的承载各类业务的线 卡上， 而改变原先将保护功能全部实现在单一主控交换板上的集中式保护策 略。 通过分布式保护方法， 可以避免集中式保护中完全使用主控交换板来实 现保护切换而引起的单点失效问题， 同时在分布式保护中， 由于不需要线卡 传递告警消息至主控交换板上， 即不存在主控交换板对线卡告警消息的调度 时延， 既而缩短 PON保护切换业务恢复时间。
本领域普通技术人员可以理解上述方法中的全部或部分步骤可通过程序 来指令相关硬件完成， 所述程序可以存储于计算机可读存储介质中， 如只读 存储器、 磁盘或光盘等。 可选地， 上述实施例的全部或部分步骤也可以使用 一个或多个集成电路来实现。 相应地， 上述实施例中的各模块 /单元可以釆用 硬件的形式实现， 也可以釆用软件功能模块的形式实现。 本发明不限制于任 何特定形式的硬件和软件的结合。
以上所述仅为本发明的优选实施例而已， 并不用于限制本发明， 对于本 领域的技术人员来说， 本发明可以有各种更改和变化。 凡在本发明的精神和 原则之内， 所作的任何修改、 等同替换、 改进等， 均应包含在本发明的保护 范围之内。
工业实用性 本发明通过分布式保护方法， 可以避免集中式保护中完全使用主控交换 板来实现保护切换而引起的单点失效问题， 同时在分布式保护中， 由于不需 要线卡传递告警消息至主控交换板上， 即不存在主控交换板对线卡告警消息 的调度时延， 既而缩短 PON保护切换业务恢复时间。

Claims

权 利 要 求 书
1、 一种实现分布式保护的方法， 包括： 光线路终端的线卡检测到主用接口损坏或主用接口上承载的业务出现中 断， 执行保护切换， 以将主用接口上承载的通信业务切换到备用接口上。
2、 如权利要求 1所述的方法， 其中： 在 B型保护方式中， 在光线路终端主用接口和光线路终端备用接口互为 保护且位于同一线卡的情况下； 光线路终端的线卡检测到主用接口损坏或主用接口上承载的业务出现中 断的步骤包括： 所述线卡检测到所述主用接口与光分配网络之间的主干通路 通信中断； 执行保护切换的步骤包括： 通过保护算法得到激活口为备用接口， 非激 活口为主用接口， 关闭所述非激活口， 并打开所述激活口， 将主用接口上承 载的通信业务切换到备用接口上。
3、 如权利要求 1所述的方法， 其中： 在 B型保护方式中， 在光线路终端主用接口和光线路终端备用接口互为 保护且位于不同线卡的情况下； 光线路终端的线卡检测到主用接口损坏或主用接口上承载的业务出现中 断的步骤包括： 主用接口所在线卡检测到所述主用接口与光分配网络之间的 主干通路通信中断； 执行保护切换的步骤包括： 通过保护算法得到激活口为备用接口， 非激 活口为主用接口， 关闭所述非激活口， 并向所述激活口所在线卡发送保护切 换消息， 所述备用接口所在线卡接收到所述保护切换消息后打开所述备用接 口， 将主用接口上承载的通信业务切换到备用接口上。
4、 如权利要求 1所述的方法， 其中: 在 C型保护方式中， 在光网络单元主用接口和备用接口互为保护， 与光 网络单元主用接口相连的光线路终端第一接口以及与光网络单元备用接口相 连的光线路终端第二接口位于同一线卡的情形下； 光线路终端的线卡检测到主用接口损坏或主用接口上承载的业务出现中 断的步骤包括： 所述线卡检测到光线路终端第一接口与光网络单元主用接口 之间的通信发生中断； 执行保护切换的步骤包括： 通过保护算法得到激活口为备用接口， 非激 活口为主用接口， 通过与激活口相连接的所述第二接口将保护切换消息发送 至所述光网络单元，所述光网络单元接收保护切换消息之后， 自行进行切换， 将主用接口上承载的通信业务切换到备用接口上。
5、 如权利要求 1所述的方法， 其中： 在 C型保护方式中， 在光网络单元主用接口和备用接口互为保护， 与光 网络单元主用接口相连的光线路终端第一接口以及与光网络单元备用接口相 连的光线路终端第二接口位于不同线卡的情形下； 光线路终端的线卡检测到主用接口损坏或主用接口上承载的业务出现中 断的步骤包括： 所述第一接口所在线卡检测到光线路终端第一接口与光网络 单元主用接口之间的通信发生中断； 执行保护切换的步骤包括： 通过保护算法得到激活口为备用接口， 非激 活口为主用接口， 将需要向光网络单元发送的保护切换消息发送至与激活口 连接的第二接口所在线卡， 第二接口所在线卡接收到保护切换消息发送至光 网络单元， 所述光网络单元接收到保护切换消息之后， 自行进行切换， 将主 用接口上承载的通信业务切换到备用接口上。
6、一种实现分布式保护的无源光网络系统， 包括光线路终端， 所述光线 路终端包括一个或多个线卡， 其中： 光线路终端的线卡设置为： 检测到主用接口损坏或主用接口上承载的业 务出现中断， 执行保护切换， 以将主用接口上承载的通信业务切换到备用接 口上。
7、 如权利要求 6所述的无源光网络系统， 其中： 在 B型保护方式中， 在光线路终端主用接口和光线路终端备用接口互为 保护且位于同一线卡的情况下； 所述线卡是设置为按如下方式检测到主用接口损坏或主用接口上承载的 业务出现中断：检测到所述主用接口与光分配网络之间的主干通路通信中断； 所述线卡是设置为按如下方式执行保护切换： 通过保护算法得到激活口 为备用接口， 非激活口为主用接口， 关闭所述非激活口， 并打开所述激活口， 将主用接口上承载的通信业务切换到备用接口上。
8、 如权利要求 6所述的无源光网络系统， 其中： 在 B型保护方式中， 光线路终端主用接口和光线路终端备用接口互为保 护且位于不同线卡的情况下， 光线路终端的线卡包括主用接口所在线卡和备 用接口所在线卡； 其中， 所述主用接口所在线卡是设置为按如下方式检测到主用接口损坏或主用 接口上承载的业务出现中断： 检测到所述主用接口与光分配网络之间的主干 通路通信中断； 所述主用接口所在线卡是设置为按如下方式执行保护切换： 通过保护算 法得到激活口为备用接口， 非激活口为主用接口， 关闭所述非激活口， 并向 所述激活口所在线卡发送保护切换消息； 所述备用接口所在线卡是设置为按如下方式执行保护切换： 接收到所述 保护切换消息后打开所述备用接口， 将主用接口上承载的通信业务切换到备 用接口上。
9、 如权利要求 6所述的无源光网络系统， 其还包括光网络单元； 在 C型保护方式中， 在光网络单元主用接口和备用接口互为保护， 与光 网络单元主用接口相连的光线路终端第一接口以及与光网络单元备用接口相 连的光线路终端第二接口位于同一线卡的情形下， 所述光线路终端的线卡包 括所述第一接口所在线卡和第二接口所在线卡； 所述第一接口所在线卡是设置为按如下方式检测到主用接口损坏或主用 接口上承载的业务出现中断： 检测到光线路终端第一接口与光网络单元主用 接口之间的通信发生中断； 所述第一接口所在线卡和第二接口所在线卡是设置为按如下方式执行保 护切换： 通过保护算法得到激活口为备用接口， 非激活口为主用接口， 通过 与激活口相连接的所述第二接口将保护切换消息发送至所述光网络单元； 所述光网络单元设置为： 接收保护切换消息之后， 自行进行切换， 将主 用接口上承载的通信业务切换到备用接口上。
10、 如权利要求 6所述的无源光网络系统， 其还包括光网络单元； 在 C型保护方式中， 在光网络单元的主用接口和备用接口互为保护， 与 光网络单元主用接口相连的光线路终端第一接口以及与光网络单元备用接口 相连的光线路终端第二接口位于不同线卡的情形下， 所述光线路终端的线卡 包括所述第一接口所在线卡和第二接口所在线卡； 所述第一接口所在线卡是设置为按如下方式检测到主用接口损坏或主用 接口上承载的业务出现中断： 检测到光线路终端第一接口与光网络单元主用 接口之间的通信发生中断； 所述第一接口所在线卡是设置为按如下方式执行保护切换： 通过保护算 法得到激活口为备用接口， 非激活口为主用接口， 将需要向光网络单元发送 的保护切换消息发送至与激活口即备用接口连接的第二接口所在线卡； 所述第二接口所在线卡是设置为按如下方式执行保护切换： 通过所述第 二接口将从第一接口所在线卡接收到的保护切换消息发送至所述光网络单 元； 所述光网络单元设置为： 接收到保护切换消息之后， 自行进行切换， 将 主用接口上承载的通信业务切换到备用接口上。
11、 一种实现分布式保护的光线路终端， 包括： 一个或多个线卡， 其中： 所述线卡设置为： 检测到主用接口损坏或主用接口上承载的业务出现中 断， 执行保护切换， 以将主用接口上承载的通信业务切换到备用接口上。
12、 如权利要求 11所述的光线路终端， 其中： 在 B型保护方式中， 在光线路终端主用接口和光线路终端备用接口互为 保护且位于同一线卡的情况下； 所述线卡是设置为按如下方式检测到主用接口损坏或主用接口上承载的 业务出现中断：检测到所述主用接口与光分配网络之间的主干通路通信中断； 所述线卡是设置为按如下方式执行保护切换： 通过保护算法得到激活口 为备用接口， 非激活口为主用接口， 关闭所述非激活口， 并打开所述激活口， 将主用接口上承载的通信业务切换到备用接口上。
13、 如权利要求 11所述的光线路终端， 其中： 在 B型保护方式中， 光线路终端主用接口和光线路终端备用接口互为保 护且位于不同线卡的情况下， 光线路终端的线卡包括主用接口所在线卡和备 用接口所在线卡； 其中， 所述主用接口所在线卡是设置为按如下方式检测到主用接口损坏或主用 接口上承载的业务出现中断： 检测到所述主用接口与光分配网络之间的主干 通路通信中断； 所述主用接口所在线卡是设置为按如下方式执行保护切换： 通过保护算 法得到激活口为备用接口， 非激活口为主用接口， 关闭所述非激活口， 并向 所述激活口所在线卡发送保护切换消息； 所述备用接口所在线卡是设置为按如下方式执行保护切换： 接收到所述 保护切换消息后打开所述备用接口， 将主用接口上承载的通信业务切换到备 用接口上。
14、 如权利要求 6所述的光线路终端， 其中： 在 C型保护方式中， 在光网络单元主用接口和备用接口互为保护， 与光 网络单元主用接口相连的光线路终端第一接口以及与光网络单元备用接口相 连的光线路终端第二接口位于同一线卡的情形下， 所述光线路终端的线卡包 括所述第一接口所在线卡和第二接口所在线卡； 所述第一接口所在线卡是设置为按如下方式检测到主用接口损坏或主用 接口上承载的业务出现中断： 检测到光线路终端第一接口与光网络单元主用 接口之间的通信发生中断； 所述第一接口所在线卡和第二接口所在线卡是设置为按如下方式执行保 护切换： 通过保护算法得到激活口为备用接口， 非激活口为主用接口， 通过 与激活口相连接的所述第二接口将保护切换消息发送至所述光网络单元， 从而使光网络单元接收保护切换消息之后， 自行进行切换， 将主用接口 上承载的通信业务切换到备用接口上。
15、 如权利要求 11所述的光线路终端， 其中： 在 C型保护方式中， 在光网络单元的主用接口和备用接口互为保护， 与 光网络单元主用接口相连的光线路终端第一接口以及与光网络单元备用接口 相连的光线路终端第二接口位于不同线卡的情形下， 所述光线路终端的线卡 包括所述第一接口所在线卡和第二接口所在线卡； 所述第一接口所在线卡是设置为按如下方式检测到主用接口损坏或主用 接口上承载的业务出现中断： 检测到光线路终端第一接口与光网络单元主用 接口之间的通信发生中断； 所述第一接口所在线卡是设置为按如下方式执行保护切换： 通过保护算 法得到激活口为备用接口， 非激活口为主用接口， 将需要向光网络单元发送 的保护切换消息发送至与激活口即备用接口连接的第二接口所在线卡；
所述第二接口所在线卡是设置为按如下方式执行保护切换： 通过所述第 二接口将从第一接口所在线卡接收到的保护切换消息发送至所述光网络单 元， 从而使所述光网络单元接收到保护切换消息之后， 自行进行切换， 将主 用接口上承载的通信业务切换到备用接口上。
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