WO2016045538A1 - Stm-1 access link protection system and method in ptn device - Google Patents

Stm-1 access link protection system and method in ptn device Download PDF

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WO2016045538A1
WO2016045538A1 PCT/CN2015/089934 CN2015089934W WO2016045538A1 WO 2016045538 A1 WO2016045538 A1 WO 2016045538A1 CN 2015089934 W CN2015089934 W CN 2015089934W WO 2016045538 A1 WO2016045538 A1 WO 2016045538A1
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stm
protection
ethernet
alarm
interface
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PCT/CN2015/089934
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French (fr)
Chinese (zh)
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高伟艺
丹亚
李霞
高玲玲
杨虎林
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烽火通信科技股份有限公司
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Priority to RU2016146785A priority Critical patent/RU2660608C1/en
Publication of WO2016045538A1 publication Critical patent/WO2016045538A1/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L43/00—Arrangements for monitoring or testing data switching networks

Definitions

  • the present invention relates to the STM field in a PTN device, and in particular, to a protection system and method for an STM-1 access link in a PTN device.
  • PTN Packet Transport Network
  • SDH Session Digital Hierarchy
  • STM-1 STM-Synchronous Transfer Module, synchronous transmission module with a rate of 155.220 Mbps
  • the STM-1 interface connects the traditional TDM (Time Division Multiplex Mode) service to the PTN network through simulation technology.
  • TDM Time Division Multiplex Mode
  • MSP Multiplex Segment Protection
  • the PTN refers to the SDH linear MSP switching method specified in Article 11.1 of GB/T 15941-2008 to protect the STM-N (Synchronous Transport Module level n) access link; the MSP automatic start criterion
  • the trigger conditions are: LOS (signal loss), LOF (frame loss), MS-AIS (multiplex section fault indication signal), dEXC (multiplex section signal failure), and dDEG (multiplex section signal degradation).
  • the PTN device of the PTN network includes the STM-1 interface unit and the cross protection unit. Because the STM-1 interface service is connected to the PTN network through CES (Circuit Emulation Service) technology, the STM-1 interface is used. There are two types of interfaces in the PTN device: 1. STM-1 interface for users, 2. Access to Ethernet interface of the PTN network (cross protection unit). The OAM (Operation Administration and Maintenance) information of the PTN service is terminated before the PTN service is transmitted from one interface circuit to another.
  • CES Circuit Emulation Service
  • the protection switching is initiated because the STM-1 access link detects the multiplex section alarm in the STM-1 frame, so when the Ethernet link layer (cross protection unit) appears the MSP automatic start criterion All services in the STM-1 interface fail when a fault other than the specified trigger condition occurs. However, when the Ethernet link layer fails, the OAM information of the Ethernet cannot be transmitted to the STM-1 multiplex section. Therefore, the multiplex section in the STM-1 frame cannot be alarmed, and the MSP protection mechanism cannot be started.
  • the existing solution is to manually initiate protection switching from the outside.
  • manually starting the protection switching requires the operator to manually monitor the Ethernet link layer in real time, which not only wastes a lot of human resources, but also has low work efficiency, and the response speed of the manual monitoring is slow, which leads to a large number of service interruptions and is inconvenient. People use it.
  • an object of the present invention is to provide a protection system and method for an STM-1 access link in a PTN device.
  • the invention can automatically start the MSP protection mechanism when the link of the Ethernet interface fails, which not only saves a lot of human resources, improves work efficiency, but also has a fast response speed, and is not easy to cause a large number of service interruptions, and is convenient for people to use.
  • the present invention provides a protection system for an STM-1 access link in a PTN device, including a cross protection unit, a synchronous transmission module STM-1 interface unit with a rate of 155.020 Mbps, and a remote device;
  • the unit includes a serially connected cross-protection Ethernet interface, an Ethernet operation management and maintenance OAM monitoring subunit, and a cross protection subunit;
  • the STM-1 interface unit includes a synchronous transmission Ethernet interface and an STM-1 interface connected end to end.
  • synchronous transmission OAM monitoring subunit synchronous transmission Ethernet connection The port is connected to the cross-protection Ethernet interface, and the STM-1 interface is connected to the remote device;
  • the cross-protection Ethernet interface is configured to: receive an STM-1 service transmitted by the synchronous transmission Ethernet interface.
  • the Ethernet OAM monitoring sub-unit is configured to: when the Ethernet connection signal loss LINK_LOS alarm is detected, or the checksum error in the media intervention control layer MAC frame exceeds the FCS_EXC alarm, the cross protection sub-unit is triggered by the automatic protection switching APS;
  • the cross protection subunit is configured to: initiate a multiplex section protection MSP protection mechanism
  • the STM-1 interface is configured to: provide an STM-1 interface to a remote device;
  • the synchronous transmission Ethernet interface is configured to: access the STM-1 service to the cross protection Ethernet interface;
  • the synchronous transmission OAM monitoring subunit is configured to: monitor an Ethernet alarm, and insert a multiplex section fault indication signal MS-AIS alarm into the STM-1 frame.
  • the signal flow of the current service is determined:
  • the STM-1 service is sequentially connected to the PTN network through the synchronous transmission Ethernet interface and the cross-protection Ethernet interface; when the Ethernet OAM monitoring sub-unit in the cross protection unit detects the LINK_LOS alarm, When the checksum of the FCS_EXC is detected in the AC frame, the APS triggers the cross protection subunit to start the MSP protection mechanism.
  • the synchronous transmission OAM monitoring sub-unit of the STM-1 interface unit detects the Ethernet alarm
  • the synchronous transmission OAM monitoring sub-unit inserts the MS-AIS alarm in the STM-1 frame.
  • the remote device detects the MS-AIS alarm, it automatically starts the MSP protection mechanism; or when the synchronous transmission OAM monitoring sub-unit of the STM-1 interface unit detects the Ethernet alarm, the synchronous transmission OAM monitoring sub-unit will be in the STM-1 frame.
  • the 6th, 7th, and 8th bits of the K2 byte of the automatic protection switching path are set. It is 1; when the remote device receives the 6th, 7th, and 8th bits of K2, it automatically starts the MSP protection mechanism.
  • the present invention further provides a method for protecting an STM-1 access link in a PTN device based on the above protection system, comprising the following steps:
  • step A determine the current service signal flow, if the current service signal flow direction is the uplink direction, go to step B, if the current service signal flow direction is the downlink direction, go to step C;
  • the STM-1 service is sequentially connected to the PTN network through the synchronous transmission Ethernet interface and the cross-protection Ethernet interface; when the Ethernet OAM monitoring sub-unit in the cross protection unit detects the LINK_LOS alarm or the AC frame checksum FCS_EXC When the alarm is triggered, the APS trigger cross protection subunit activates the MSP protection mechanism;
  • the synchronous transmission OAM monitoring subunit of the STM-1 interface unit detects an Ethernet alarm
  • the synchronous transmission OAM monitoring subunit inserts an MS-AIS alarm in the STM-1 frame.
  • the remote device detects the MS-AIS alarm, it automatically starts the MSP protection mechanism.
  • the synchronous transmission OAM monitoring subunit of the STM-1 interface unit detects the Ethernet alarm, the synchronous transmission OAM monitoring subunit will block the sixth, seventh and eighth bits of the K2 byte of the automatic protection switching path in the STM-1 frame. Set to 1; when the remote device receives the 6th, 7th, and 8th bits of K2, it automatically starts the MSP protection mechanism.
  • the automatically starting the MSP protection mechanism in the step C includes the following steps: automatically starting the MSP protection according to the SDH linear MSP switching mode and the MSP automatic startup criterion specified in Article 11.1 of GB/T 15941-2008. mechanism.
  • the Ethernet alarm in step C includes a LINK_LOS alarm or a checksum FCS_EXC alarm in a MAC frame.
  • Ethernet link layer synchronous transport Ethernet interface of the STM-1 interface unit
  • STM-1 interface unit the local end
  • the local end When the negotiated code stream is configured, the local end generates a LINK_LOS alarm.
  • the LINK_LOS alarm occurs, all the services of the STM-1 interface are in the interface with the PTN device, which is consistent with the LOS, LOF, and MS-AIS alarms in the STM-1 frame specified in the SDH linear MSP switching mode.
  • the Ethernet OAM monitoring subunit can monitor the LINK_LOS alarm, or the checksum FCS_EXC alarm in the AC frame, and activate the MSP protection mechanism by the APS trigger cross protection subunit.
  • the invention needs to manually start the protection switching, and the present invention can be in the Ethernet interface when the signal flow direction of the service is in the uplink direction.
  • the MSP protection mechanism is automatically started, which not only saves a lot of human resources, improves work efficiency, but also has a fast response speed, which is not easy to cause a large number of business interruptions and is convenient for people to use.
  • the synchronous transmission OAM monitoring sub-unit can monitor the Ethernet alarm and insert the MS-AIS alarm into the STM-1 frame; when the remote device detects the MS-AIS alarm According to the SDH linear MSP switching mode and the MSP automatic start criterion specified in Article 11.1 of GB/T 15941-2008, the MSP protection mechanism is automatically started.
  • the sixth, seventh, and eighth bits of the K2 byte in the STM-1 frame can also be set to "1"; the remote device receives the sixth of the K2.
  • the MSP protection mechanism is automatically started according to the SDH linear MSP switching mode and the MSP automatic start criterion specified in Article 11.1 of GB/T 15941-2008.
  • the present invention can automatically start the MSP protection mechanism when the link of the Ethernet interface fails, which not only saves a lot of human resources, improves work efficiency, but also has a fast response speed and is not easy to cause a large amount. Business disruption Used by people.
  • FIG. 1 is a structural block diagram of a protection system for an STM-1 access link in a PTN device according to an embodiment of the present invention.
  • the protection system of the STM-1 access link in the PTN device in the embodiment of the present invention includes a cross protection unit, an STM-1 interface unit, and a remote device.
  • the cross protection unit includes a serially connected cross protection Ethernet interface, an Ethernet OAM monitoring subunit, and a cross protection subunit;
  • the STM-1 interface unit includes a synchronous transmission Ethernet interface, an STM-1 interface, and a synchronous transmission that are sequentially connected end to end.
  • the OAM monitoring subunit; the synchronous transmission Ethernet interface is connected to the cross protection Ethernet interface, and the STM-1 interface is connected to the remote device.
  • the cross-protection Ethernet interface is used to receive the STM-1 service transmitted by the synchronous transmission Ethernet interface.
  • the Ethernet OAM monitoring sub-unit is used to: monitor the LINK_LOS (Ethernet connection signal loss) alarm, or the MAC (Media Access Control, Media Intervention Control Layer) frame checksum and FCS_EXC (error violation limit) alarm, through APS (Automatic Protection Switched, triggers the cross protection subunit.
  • LINK_LOS Ethernet connection signal loss
  • MAC Media Access Control, Media Intervention Control Layer
  • FCS_EXC error violation limit
  • the cross protection subunit is used to: initiate the MSP (multiplex section protection) protection mechanism.
  • the STM-1 interface is used to provide an STM-1 interface to a remote device.
  • the synchronous transport Ethernet interface is used to: connect the STM-1 service to the cross-protected Ethernet interface.
  • Synchronous transmission OAM monitoring subunit is used to: monitor Ethernet alarms and to STM-1
  • MS-AIS Multiple Segment Failure Indication Signal
  • the method for protecting an STM-1 access link in a PTN device based on the foregoing system in the embodiment of the present invention includes the following steps:
  • step S1 Determine the signal flow direction of the current service. If the current service signal flow direction is the uplink direction, go to step S2. If the current service signal flow direction is the downlink direction, go to step S3.
  • the STM-1 service is sequentially connected to the PTN network through a synchronous transmission Ethernet interface and a cross-protection Ethernet interface.
  • the Ethernet OAM monitoring subunit in the cross protection unit detects the LINK_LOS alarm or the checksum FCS_EXC alarm in the AC frame, the APS trigger cross protection subunit activates the MSP protection mechanism.
  • Step S3 may also be: when the synchronous transmission OAM monitoring subunit of the STM-1 interface unit detects the Ethernet alarm, the synchronous transmission OAM monitoring subunit will K2 bytes in the STM-1 frame (automatic protection switching path byte) The 6th, 7th, and 8th bits are all set to "1".
  • the remote device receives the 6th, 7th, and 8th bits of K2 as “1”, it automatically starts the MSP protection mechanism according to the SDH linear MSP switching mode and the MSP automatic start criterion specified in Article 11.1 of GB/T15941-2008.
  • the Ethernet alarm in step S3 includes a LINK_LOS alarm or a checksum FCS_EXC alarm in the MAC frame.
  • Ethernet link layer synchronous transport Ethernet interface of the STM-1 interface unit
  • STM-1 interface unit When negotiating the code stream, the local end generates a LINK_LOS alarm.
  • the LINK_LOS alarm occurs, all the services of the STM-1 interface are in the interface with the PTN device, which is consistent with the LOS, LOF, and MS-AIS alarms in the STM-1 frame specified in the SDH linear MSP switching mode.
  • FCS error amount of the check sequence
  • the local end When the error amount of the check sequence (FCS) in the MAC frame of the Ethernet reaches the user-set threshold, the local end generates an FCS_EXC alarm.
  • FCS is used to monitor the error condition of the MAC frame during transmission.
  • FCS error When the synchronous transmission Ethernet interface of the STM-1 interface unit detects the FCS error, it indicates that the frame is damaged during transmission; the FCS error and the error performance of the multiplex section Similarly, it will cause business damage.

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  • Computer Networks & Wireless Communication (AREA)
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Abstract

The present invention relates to the field of STMs for PTN devices. Disclosed are an STM-1 access link protection system and method for a PTN device. The system comprises an Ethernet OAM monitoring sub-unit, a cross protection sub-unit, a synchronous transfer Ethernet interface and a synchronous transfer OAM monitoring sub-unit; the Ethernet OAM monitoring sub-unit is used to trigger the cross protection sub-unit to activate an MSP protection mechanism when detecting an Ethernet link signal loss LINK_LOS alert, or a media access control layer MAC frame check and error threshold-crossing FCS_EXC alert; the synchronous transmission OAM monitoring sub-unit is used to monitor an Ethernet alert, and insert a multiplex section accident indication signal MS-AIS alert. The present invention can automatically activate an MSP protection mechanism when an Ethernet interface link fails, thus not only saving manpower and improving working efficiency, but also responding quickly and being less likely to cause a large number of service interruptions.

Description

PTN设备中STM-1接入链路的保护***及方法Protection system and method for STM-1 access link in PTN equipment 技术领域Technical field
本发明涉及PTN设备中的STM领域，具体涉及一种PTN设备中STM-1接入链路的保护***及方法。The present invention relates to the STM field in a PTN device, and in particular, to a protection system and method for an STM-1 access link in a PTN device.
背景技术Background technique
PTN(Packet Transport Network，分组传送网)技术是基于分组内核的新一代多业务传送技术，PTN网络能够提供多种UNI(用户网络接口)，例如基于SDH(Synchronous Digital Hierarchy，同步数字体系)技术的STM-1(STM-Synchronous Transfer Module，速率155.520Mbps的同步传输模块)接口。STM-1接口通过仿真技术，将传统的TDM(时分复用模式)业务接入至PTN网络中。为增加STM-1接入链路的稳定性，***通信企业标准要求STM-1接口应提供支持MSP(复用段保护)的保护能力。PTN (Packet Transport Network) technology is a new generation multi-service transmission technology based on packet core. PTN network can provide multiple UNI (user network interface), such as SDH (Synchronous Digital Hierarchy) technology. STM-1 (STM-Synchronous Transfer Module, synchronous transmission module with a rate of 155.220 Mbps) interface. The STM-1 interface connects the traditional TDM (Time Division Multiplex Mode) service to the PTN network through simulation technology. In order to increase the stability of the STM-1 access link, the China Mobile Communications Enterprise Standard requires that the STM-1 interface provide protection capabilities that support MSP (Multiplex Segment Protection).
PTN参照GB/T 15941-2008第11.1条所规范的SDH线性MSP倒换方式，对STM-N(Synchronous Transport Module level n，n级同步传输模块)接入链路进行保护；MSP自动启动准则所规定的触发条件为：LOS(信号丢失)、LOF(帧丢失)、MS-AIS(复用段故障指示信号)、dEXC(复用段信号失效)和dDEG(复用段信号劣化)。The PTN refers to the SDH linear MSP switching method specified in Article 11.1 of GB/T 15941-2008 to protect the STM-N (Synchronous Transport Module level n) access link; the MSP automatic start criterion The trigger conditions are: LOS (signal loss), LOF (frame loss), MS-AIS (multiplex section fault indication signal), dEXC (multiplex section signal failure), and dDEG (multiplex section signal degradation).
参见图1所示，PTN网络的PTN设备包括STM-1接口单元和交叉保护单元，因为STM-1接口业务通过CES(Circuit Emulation Service，电路仿真)技术接入至PTN网络，所以STM-1接口单元在PTN设备中存在2种接口：1、面向用户的STM-1接口，2、接入至 PTN网络(交叉保护单元)的以太网接口。PTN业务从1种接口电路传输至另1种接口电路之前，PTN业务的OAM(Operation Administration and Maintenance，运营、管理和维护)信息会终结。As shown in Figure 1, the PTN device of the PTN network includes the STM-1 interface unit and the cross protection unit. Because the STM-1 interface service is connected to the PTN network through CES (Circuit Emulation Service) technology, the STM-1 interface is used. There are two types of interfaces in the PTN device: 1. STM-1 interface for users, 2. Access to Ethernet interface of the PTN network (cross protection unit). The OAM (Operation Administration and Maintenance) information of the PTN service is terminated before the PTN service is transmitted from one interface circuit to another.
在MSP自动启动准则中，由于STM-1接入链路监测到STM-1帧中的复用段告警才会启动保护倒换，因此当以太网链路层(交叉保护单元)出现MSP自动启动准则所规定的触发条件之外的故障时，STM-1接口中的所有业务都出现故障。但是，当以太网链路层出现故障时，以太网的OAM信息无法传递至STM-1复用段，所以STM-1帧中的复用段无法告警，进而使得MSP保护机制无法启动。In the MSP auto-start criterion, the protection switching is initiated because the STM-1 access link detects the multiplex section alarm in the STM-1 frame, so when the Ethernet link layer (cross protection unit) appears the MSP automatic start criterion All services in the STM-1 interface fail when a fault other than the specified trigger condition occurs. However, when the Ethernet link layer fails, the OAM information of the Ethernet cannot be transmitted to the STM-1 multiplex section. Therefore, the multiplex section in the STM-1 frame cannot be alarmed, and the MSP protection mechanism cannot be started.
在MSP保护机制的情况下，现有的解决方案为人工从外部启动保护倒换。但是，人工启动保护倒换需要操作人员实时对以太网链路层进行人工监视，不仅浪费了大量的人力资源，工作效率较低，而且人工监视的响应速度较慢，进而导致大量业务中断，不便于人们使用。In the case of the MSP protection mechanism, the existing solution is to manually initiate protection switching from the outside. However, manually starting the protection switching requires the operator to manually monitor the Ethernet link layer in real time, which not only wastes a lot of human resources, but also has low work efficiency, and the response speed of the manual monitoring is slow, which leads to a large number of service interruptions and is inconvenient. People use it.
发明内容Summary of the invention
针对现有技术中存在的缺陷，本发明的目的在于提供一种PTN设备中STM-1接入链路的保护***及方法。本发明能够在以太网接口的链路出现故障时自动启动MSP保护机制，不仅能够节省大量的人力资源，提高工作效率，而且响应速度较快，不易导致大量业务中断，便于人们使用。In view of the deficiencies in the prior art, an object of the present invention is to provide a protection system and method for an STM-1 access link in a PTN device. The invention can automatically start the MSP protection mechanism when the link of the Ethernet interface fails, which not only saves a lot of human resources, improves work efficiency, but also has a fast response speed, and is not easy to cause a large number of service interruptions, and is convenient for people to use.
为达到以上目的，本发明提供一种PTN设备中STM-1接入链路的保护***，包括交叉保护单元、速率155.520Mbps的同步传输模块STM-1接口单元和远端设备；所述交叉保护单元包括顺次相连的交叉保护以太网接口、以太网运营管理维护OAM监测子单元和交叉保护子单元；所述STM-1接口单元包括顺次首尾相连的同步传输以太网接口、STM-1接口和同步传输OAM监测子单元；同步传输以太网接 口和交叉保护以太网接口相连，STM-1接口和远端设备相连；To achieve the above objective, the present invention provides a protection system for an STM-1 access link in a PTN device, including a cross protection unit, a synchronous transmission module STM-1 interface unit with a rate of 155.020 Mbps, and a remote device; The unit includes a serially connected cross-protection Ethernet interface, an Ethernet operation management and maintenance OAM monitoring subunit, and a cross protection subunit; the STM-1 interface unit includes a synchronous transmission Ethernet interface and an STM-1 interface connected end to end. And synchronous transmission OAM monitoring subunit; synchronous transmission Ethernet connection The port is connected to the cross-protection Ethernet interface, and the STM-1 interface is connected to the remote device;
所述交叉保护以太网接口用于：接收同步传输以太网接口传输的STM-1业务。The cross-protection Ethernet interface is configured to: receive an STM-1 service transmitted by the synchronous transmission Ethernet interface.
所述以太网OAM监测子单元用于：监测到以太网连接信号丢失LINK_LOS告警、或者媒体介入控制层MAC帧中校验和出错越限FCS_EXC告警时，通过自动保护倒换APS触发交叉保护子单元；The Ethernet OAM monitoring sub-unit is configured to: when the Ethernet connection signal loss LINK_LOS alarm is detected, or the checksum error in the media intervention control layer MAC frame exceeds the FCS_EXC alarm, the cross protection sub-unit is triggered by the automatic protection switching APS;
所述交叉保护子单元用于：启动复用段保护MSP保护机制；The cross protection subunit is configured to: initiate a multiplex section protection MSP protection mechanism;
所述STM-1接口用于：向远端设备提供STM-1接口；The STM-1 interface is configured to: provide an STM-1 interface to a remote device;
所述同步传输以太网接口用于：将STM-1业务接入至交叉保护以太网接口；The synchronous transmission Ethernet interface is configured to: access the STM-1 service to the cross protection Ethernet interface;
所述同步传输OAM监测子单元用于：监测以太网告警、并向STM-1帧中***复用段故障指示信号MS-AIS告警。The synchronous transmission OAM monitoring subunit is configured to: monitor an Ethernet alarm, and insert a multiplex section fault indication signal MS-AIS alarm into the STM-1 frame.
在上述技术方案的基础上，所述保护***对PTN设备中STM-1接入链路进行保护时，确定当前业务的信号流向：On the basis of the foregoing technical solutions, when the protection system protects the STM-1 access link in the PTN device, the signal flow of the current service is determined:
若当前业务的信号流向为上行方向，STM-1业务依次通过同步传输以太网接口、交叉保护以太网接口接入至PTN网络；当交叉保护单元中的以太网OAM监测子单元监测到LINK_LOS告警、或者AC帧中校验和FCS_EXC告警时，通过APS触发交叉保护子单元启动MSP保护机制；If the current service traffic is in the uplink direction, the STM-1 service is sequentially connected to the PTN network through the synchronous transmission Ethernet interface and the cross-protection Ethernet interface; when the Ethernet OAM monitoring sub-unit in the cross protection unit detects the LINK_LOS alarm, When the checksum of the FCS_EXC is detected in the AC frame, the APS triggers the cross protection subunit to start the MSP protection mechanism.
若当前业务的信号流向为下行方向，当STM-1接口单元的同步传输OAM监测子单元监测到以太网告警时，同步传输OAM监测子单元在STM-1帧中***MS-AIS告警。远端设备监测到MS-AIS告警时，自动启动MSP保护机制；或者当STM-1接口单元的同步传输OAM监测子单元监测到以太网告警时，同步传输OAM监测子单元将STM-1帧中的自动保护倒换通路K2字节的第6、7、8比特均设置 为1；远端设备收到K2的第6、7、8比特均为1时，自动启动MSP保护机制。If the current traffic of the service is in the downlink direction, when the synchronous transmission OAM monitoring sub-unit of the STM-1 interface unit detects the Ethernet alarm, the synchronous transmission OAM monitoring sub-unit inserts the MS-AIS alarm in the STM-1 frame. When the remote device detects the MS-AIS alarm, it automatically starts the MSP protection mechanism; or when the synchronous transmission OAM monitoring sub-unit of the STM-1 interface unit detects the Ethernet alarm, the synchronous transmission OAM monitoring sub-unit will be in the STM-1 frame. The 6th, 7th, and 8th bits of the K2 byte of the automatic protection switching path are set. It is 1; when the remote device receives the 6th, 7th, and 8th bits of K2, it automatically starts the MSP protection mechanism.
本发明还提供一种基于上述保护***的PTN设备中STM-1接入链路的保护方法，包括以下步骤：The present invention further provides a method for protecting an STM-1 access link in a PTN device based on the above protection system, comprising the following steps:
A、确定当前业务的信号流向，若当前业务的信号流向为上行方向，转到步骤B，若当前业务的信号流向为下行方向，转到步骤C；A, determine the current service signal flow, if the current service signal flow direction is the uplink direction, go to step B, if the current service signal flow direction is the downlink direction, go to step C;
B、STM-1业务依次通过同步传输以太网接口、交叉保护以太网接口接入至PTN网络；当交叉保护单元中的以太网OAM监测子单元监测到LINK_LOS告警、或者AC帧中校验和FCS_EXC告警时，通过APS触发交叉保护子单元启动MSP保护机制；B. The STM-1 service is sequentially connected to the PTN network through the synchronous transmission Ethernet interface and the cross-protection Ethernet interface; when the Ethernet OAM monitoring sub-unit in the cross protection unit detects the LINK_LOS alarm or the AC frame checksum FCS_EXC When the alarm is triggered, the APS trigger cross protection subunit activates the MSP protection mechanism;
C、当STM-1接口单元的同步传输OAM监测子单元监测到以太网告警时，同步传输OAM监测子单元在STM-1帧中***MS-AIS告警。远端设备监测到MS-AIS告警时，自动启动MSP保护机制；C. When the synchronous transmission OAM monitoring subunit of the STM-1 interface unit detects an Ethernet alarm, the synchronous transmission OAM monitoring subunit inserts an MS-AIS alarm in the STM-1 frame. When the remote device detects the MS-AIS alarm, it automatically starts the MSP protection mechanism.
或者当STM-1接口单元的同步传输OAM监测子单元监测到以太网告警时，同步传输OAM监测子单元将STM-1帧中的自动保护倒换通路K2字节的第6、7、8比特均设置为1；远端设备收到K2的第6、7、8比特均为1时，自动启动MSP保护机制。Or when the synchronous transmission OAM monitoring subunit of the STM-1 interface unit detects the Ethernet alarm, the synchronous transmission OAM monitoring subunit will block the sixth, seventh and eighth bits of the K2 byte of the automatic protection switching path in the STM-1 frame. Set to 1; when the remote device receives the 6th, 7th, and 8th bits of K2, it automatically starts the MSP protection mechanism.
在上述技术方案的基础上，步骤C中所述自动启动MSP保护机制包括以下步骤：根据GB/T 15941-2008第11.1条所规范的SDH线性MSP倒换方式和MSP自动启动准则，自动启动MSP保护机制。Based on the foregoing technical solution, the automatically starting the MSP protection mechanism in the step C includes the following steps: automatically starting the MSP protection according to the SDH linear MSP switching mode and the MSP automatic startup criterion specified in Article 11.1 of GB/T 15941-2008. mechanism.
在上述技术方案的基础上，步骤C中所述以太网告警包括LINK_LOS告警或者MAC帧中校验和FCS_EXC告警。Based on the foregoing technical solution, the Ethernet alarm in step C includes a LINK_LOS alarm or a checksum FCS_EXC alarm in a MAC frame.
与现有技术相比，本发明的优点在于：The advantages of the present invention over the prior art are:
(1)当以太网链路层(STM-1接口单元的同步传输以太网接口)监测到信号丢失时、或者无法正确收到与本端(STM-1接口单元)匹 配的协商码流时，本端会产生LINK_LOS告警。LINK_LOS告警发生时，所有STM-1接口的业务在与PTN设备接口处发生告警，与规范的SDH线性MSP倒换方式规定的发生STM-1帧中的LOS、LOF和MS-AIS告警结果一致。(1) When the Ethernet link layer (synchronous transport Ethernet interface of the STM-1 interface unit) detects a loss of signal, or fails to receive the correct connection with the local end (STM-1 interface unit) When the negotiated code stream is configured, the local end generates a LINK_LOS alarm. When the LINK_LOS alarm occurs, all the services of the STM-1 interface are in the interface with the PTN device, which is consistent with the LOS, LOF, and MS-AIS alarms in the STM-1 frame specified in the SDH linear MSP switching mode.
因此，本发明在信号流向为上行方向时，以太网OAM监测子单元能够监测LINK_LOS告警，或者AC帧中校验和FCS_EXC告警、并通过APS触发交叉保护子单元启动MSP保护机制。与现有技术中以太网链路层出现MSP自动启动准则所规定的触发条件之外的故障时需要人工启动保护倒换相比，本发明在业务的信号流向为上行方向时，能够在以太网接口的链路出现故障时自动启动MSP保护机制，不仅能够节省大量的人力资源，提高工作效率，而且响应速度较快，不易导致大量业务中断，便于人们使用。Therefore, when the signal flow direction is the uplink direction, the Ethernet OAM monitoring subunit can monitor the LINK_LOS alarm, or the checksum FCS_EXC alarm in the AC frame, and activate the MSP protection mechanism by the APS trigger cross protection subunit. Compared with the prior art, when the Ethernet link layer has a fault other than the trigger condition specified by the MSP automatic start criterion, the invention needs to manually start the protection switching, and the present invention can be in the Ethernet interface when the signal flow direction of the service is in the uplink direction. When the link fails, the MSP protection mechanism is automatically started, which not only saves a lot of human resources, improves work efficiency, but also has a fast response speed, which is not easy to cause a large number of business interruptions and is convenient for people to use.
(2)本发明在业务的信号流向为下行方向时，同步传输OAM监测子单元能够监测以太网告警、并往STM-1帧中***MS-AIS告警；远端设备监测到MS-AIS告警时，根据GB/T 15941-2008第11.1条所规范的SDH线性MSP倒换方式和MSP自动启动准则，自动启动MSP保护机制。(2) When the signal flow direction of the service is in the downlink direction, the synchronous transmission OAM monitoring sub-unit can monitor the Ethernet alarm and insert the MS-AIS alarm into the STM-1 frame; when the remote device detects the MS-AIS alarm According to the SDH linear MSP switching mode and the MSP automatic start criterion specified in Article 11.1 of GB/T 15941-2008, the MSP protection mechanism is automatically started.
同步传输OAM监测子单元监测到以太网告警时，还能够将STM-1帧中的K2字节的第6、7、8比特均设置为“1”；远端设备收到K2的第6、7、8比特均为“1”时，根据GB/T 15941-2008第11.1条所规范的SDH线性MSP倒换方式和MSP自动启动准则，自动启动MSP保护机制。When the synchronous transmission OAM monitoring subunit monitors the Ethernet alarm, the sixth, seventh, and eighth bits of the K2 byte in the STM-1 frame can also be set to "1"; the remote device receives the sixth of the K2. When the 7 and 8 bits are both "1", the MSP protection mechanism is automatically started according to the SDH linear MSP switching mode and the MSP automatic start criterion specified in Article 11.1 of GB/T 15941-2008.
因此，本发明在信号流向为下行方向时，能够在以太网接口的链路出现故障时自动启动MSP保护机制，不仅能够节省大量的人力资源，提高工作效率，而且响应速度较快，不易导致大量业务中断，便 于人们使用。Therefore, when the signal flow direction is in the downlink direction, the present invention can automatically start the MSP protection mechanism when the link of the Ethernet interface fails, which not only saves a lot of human resources, improves work efficiency, but also has a fast response speed and is not easy to cause a large amount. Business disruption Used by people.
附图说明DRAWINGS
图1为本发明实施例中PTN设备中STM-1接入链路的保护***的结构框图。FIG. 1 is a structural block diagram of a protection system for an STM-1 access link in a PTN device according to an embodiment of the present invention.
具体实施方式detailed description
以下结合附图及实施例对本发明作进一步详细说明。The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.
参见图1所示，本发明实施例中的PTN设备中STM-1接入链路的保护***，包括交叉保护单元、STM-1接口单元和远端设备。Referring to FIG. 1, the protection system of the STM-1 access link in the PTN device in the embodiment of the present invention includes a cross protection unit, an STM-1 interface unit, and a remote device.
交叉保护单元包括顺次相连的交叉保护以太网接口、以太网OAM监测子单元和交叉保护子单元；STM-1接口单元包括顺次首尾相连的同步传输以太网接口、STM-1接口和同步传输OAM监测子单元；同步传输以太网接口和交叉保护以太网接口相连，STM-1接口和远端设备相连。The cross protection unit includes a serially connected cross protection Ethernet interface, an Ethernet OAM monitoring subunit, and a cross protection subunit; the STM-1 interface unit includes a synchronous transmission Ethernet interface, an STM-1 interface, and a synchronous transmission that are sequentially connected end to end. The OAM monitoring subunit; the synchronous transmission Ethernet interface is connected to the cross protection Ethernet interface, and the STM-1 interface is connected to the remote device.
交叉保护以太网接口用于：接收同步传输以太网接口传输的STM-1业务。The cross-protection Ethernet interface is used to receive the STM-1 service transmitted by the synchronous transmission Ethernet interface.
以太网OAM监测子单元用于：监测LINK_LOS(以太网连接信号丢失)告警、或者MAC(Media Access Control，媒体介入控制层)帧中校验和FCS_EXC(出错越限)告警时，通过APS(Automatic Protection Switched，自动保护倒换)触发交叉保护子单元。The Ethernet OAM monitoring sub-unit is used to: monitor the LINK_LOS (Ethernet connection signal loss) alarm, or the MAC (Media Access Control, Media Intervention Control Layer) frame checksum and FCS_EXC (error violation limit) alarm, through APS (Automatic Protection Switched, triggers the cross protection subunit.
交叉保护子单元用于：启动MSP(复用段保护)保护机制。The cross protection subunit is used to: initiate the MSP (multiplex section protection) protection mechanism.
STM-1接口用于：向远端设备提供STM-1接口。The STM-1 interface is used to provide an STM-1 interface to a remote device.
同步传输以太网接口用于：将STM-1业务接入至交叉保护以太网接口。The synchronous transport Ethernet interface is used to: connect the STM-1 service to the cross-protected Ethernet interface.
同步传输OAM监测子单元用于：监测以太网告警、并向STM-1 帧中***MS-AIS(复用段故障指示信号)告警。Synchronous transmission OAM monitoring subunit is used to: monitor Ethernet alarms and to STM-1 The MS-AIS (Multiple Segment Failure Indication Signal) alarm is inserted into the frame.
本发明实施例中的基于上述***的PTN设备中STM-1接入链路的保护方法，包括以下步骤：The method for protecting an STM-1 access link in a PTN device based on the foregoing system in the embodiment of the present invention includes the following steps:
S1：确定当前业务的信号流向，若当前业务的信号流向为上行方向，转到步骤S2，若当前业务的信号流向为下行方向，转到步骤S3。S1: Determine the signal flow direction of the current service. If the current service signal flow direction is the uplink direction, go to step S2. If the current service signal flow direction is the downlink direction, go to step S3.
S2：STM-1业务依次通过同步传输以太网接口、交叉保护以太网接口接入至PTN网络。当交叉保护单元中的以太网OAM监测子单元监测到LINK_LOS告警、或者AC帧中校验和FCS_EXC告警时，通过APS触发交叉保护子单元启动MSP保护机制。S2: The STM-1 service is sequentially connected to the PTN network through a synchronous transmission Ethernet interface and a cross-protection Ethernet interface. When the Ethernet OAM monitoring subunit in the cross protection unit detects the LINK_LOS alarm or the checksum FCS_EXC alarm in the AC frame, the APS trigger cross protection subunit activates the MSP protection mechanism.
S3：当STM-1接口单元的同步传输OAM监测子单元监测到以太网告警时，同步传输OAM监测子单元在STM-1帧中***MS-AIS告警。远端设备监测到MS-AIS告警时，根据GB/T 15941-2008第11.1条所规范的SDH线性MSP倒换方式和MSP自动启动准则，自动启动MSP保护机制。S3: When the synchronous transmission OAM monitoring subunit of the STM-1 interface unit detects an Ethernet alarm, the synchronous transmission OAM monitoring subunit inserts an MS-AIS alarm in the STM-1 frame. When the remote device detects the MS-AIS alarm, it automatically starts the MSP protection mechanism according to the SDH linear MSP switching mode and the MSP automatic startup criterion specified in Article 11.1 of GB/T 15941-2008.
步骤S3还可以为：当STM-1接口单元的同步传输OAM监测子单元监测到以太网告警时，同步传输OAM监测子单元将STM-1帧中的K2字节(自动保护倒换通路字节)的第6、7、8比特均设置为“1”。远端设备收到K2的第6、7、8比特均为“1”时，根据GB/T15941-2008第11.1条所规范的SDH线性MSP倒换方式和MSP自动启动准则，自动启动MSP保护机制。Step S3 may also be: when the synchronous transmission OAM monitoring subunit of the STM-1 interface unit detects the Ethernet alarm, the synchronous transmission OAM monitoring subunit will K2 bytes in the STM-1 frame (automatic protection switching path byte) The 6th, 7th, and 8th bits are all set to "1". When the remote device receives the 6th, 7th, and 8th bits of K2 as “1”, it automatically starts the MSP protection mechanism according to the SDH linear MSP switching mode and the MSP automatic start criterion specified in Article 11.1 of GB/T15941-2008.
步骤S3中的以太网告警包括LINK_LOS告警、或者MAC帧中校验和FCS_EXC告警。The Ethernet alarm in step S3 includes a LINK_LOS alarm or a checksum FCS_EXC alarm in the MAC frame.
本发明的工作原理如下：The working principle of the invention is as follows:
当以太网链路层(STM-1接口单元的同步传输以太网接口)监测到信号丢失时、或者无法正确收到与本端(STM-1接口单元)匹配的 协商码流时，本端会产生LINK_LOS告警。LINK_LOS告警发生时，所有STM-1接口的业务在与PTN设备接口处发生告警，与规范的SDH线性MSP倒换方式规定的发生STM-1帧中的LOS、LOF和MS-AIS告警结果一致。When the Ethernet link layer (synchronous transport Ethernet interface of the STM-1 interface unit) detects a loss of signal, or fails to correctly receive the match with the local end (STM-1 interface unit) When negotiating the code stream, the local end generates a LINK_LOS alarm. When the LINK_LOS alarm occurs, all the services of the STM-1 interface are in the interface with the PTN device, which is consistent with the LOS, LOF, and MS-AIS alarms in the STM-1 frame specified in the SDH linear MSP switching mode.
当以太网的MAC帧中校验序列(FCS)的出错量达到用户设定门限时，本端会产生FCS_EXC告警。FCS用于监视MAC帧在传输过程中误码情况，STM-1接口单元的同步传输以太网接口监测到FCS出错时，表明此帧在传输过程中损坏；FCS出错与复用段的误码性能类似，均会导致业务损坏。When the error amount of the check sequence (FCS) in the MAC frame of the Ethernet reaches the user-set threshold, the local end generates an FCS_EXC alarm. The FCS is used to monitor the error condition of the MAC frame during transmission. When the synchronous transmission Ethernet interface of the STM-1 interface unit detects the FCS error, it indicates that the frame is damaged during transmission; the FCS error and the error performance of the multiplex section Similarly, it will cause business damage.
本发明不局限于上述实施方式，对于本技术领域的普通技术人员来说，在不脱离本发明原理的前提下，还可以做出若干改进和润饰，这些改进和润饰也视为本发明的保护范围之内。本说明书中未作详细描述的内容属于本领域专业技术人员公知的现有技术。 The present invention is not limited to the above embodiments, and those skilled in the art can also make several improvements and retouchings without departing from the principles of the present invention. These improvements and retouchings are also considered as protection of the present invention. Within the scope. The contents not described in detail in the present specification belong to the prior art well known to those skilled in the art.

Claims (5)

  1. 一种PTN设备中STM-1接入链路的保护***，包括交叉保护单元、速率155.520Mbps的同步传输模块STM-1接口单元和远端设备；所述交叉保护单元包括顺次相连的交叉保护以太网接口、以太网运营管理维护OAM监测子单元和交叉保护子单元；所述STM-1接口单元包括顺次首尾相连的同步传输以太网接口、STM-1接口和同步传输OAM监测子单元；同步传输以太网接口和交叉保护以太网接口相连，STM-1接口和远端设备相连；其特征在于：A protection system for an STM-1 access link in a PTN device, comprising a cross protection unit, a synchronous transmission module STM-1 interface unit with a rate of 155.220 Mbps, and a remote device; the cross protection unit includes cross protection connected in sequence The Ethernet interface, the Ethernet operation management and maintenance OAM monitoring subunit and the cross protection subunit; the STM-1 interface unit comprises a synchronous transmission Ethernet interface, an STM-1 interface and a synchronous transmission OAM monitoring subunit connected in sequence; The synchronous transmission Ethernet interface is connected to the cross-protection Ethernet interface, and the STM-1 interface is connected to the remote device;
    所述交叉保护以太网接口用于：接收同步传输以太网接口传输的STM-1业务；The cross protection Ethernet interface is configured to: receive an STM-1 service transmitted by the synchronous transmission Ethernet interface;
    所述以太网OAM监测子单元用于：监测到以太网连接信号丢失LINK_LOS告警、或者媒体介入控制层MAC帧中校验和出错越限FCS_EXC告警时，通过自动保护倒换APS触发交叉保护子单元；The Ethernet OAM monitoring sub-unit is configured to: when the Ethernet connection signal loss LINK_LOS alarm is detected, or the checksum error in the media intervention control layer MAC frame exceeds the FCS_EXC alarm, the cross protection sub-unit is triggered by the automatic protection switching APS;
    所述交叉保护子单元用于：启动复用段保护MSP保护机制；The cross protection subunit is configured to: initiate a multiplex section protection MSP protection mechanism;
    所述STM-1接口用于：向远端设备提供STM-1接口；The STM-1 interface is configured to: provide an STM-1 interface to a remote device;
    所述同步传输以太网接口用于：将STM-1业务接入至交叉保护以太网接口；The synchronous transmission Ethernet interface is configured to: access the STM-1 service to the cross protection Ethernet interface;
    所述同步传输OAM监测子单元用于：监测以太网告警、并向STM-1帧中***复用段故障指示信号MS-AIS告警。The synchronous transmission OAM monitoring subunit is configured to: monitor an Ethernet alarm, and insert a multiplex section fault indication signal MS-AIS alarm into the STM-1 frame.
  2. 如权利要求1所述的PTN设备中STM-1接入链路的保护***，其特征在于：所述保护***对PTN设备中STM-1接入链路进行保护时，确定当前业务的信号流向：The protection system of the STM-1 access link in the PTN device according to claim 1, wherein the protection system determines the current service signal flow when protecting the STM-1 access link in the PTN device. :
    若当前业务的信号流向为上行方向，STM-1业务依次通过同步传输以太网接口、交叉保护以太网接口接入至PTN网络；当交叉保护单元中的以太网OAM监测子单元监测到LINK_LOS告警、或者AC 帧中校验和FCS_EXC告警时，通过APS触发交叉保护子单元启动MSP保护机制；If the current service traffic is in the uplink direction, the STM-1 service is sequentially connected to the PTN network through the synchronous transmission Ethernet interface and the cross-protection Ethernet interface; when the Ethernet OAM monitoring sub-unit in the cross protection unit detects the LINK_LOS alarm, Or AC When the checksum of the frame is FCS_EXC, the APS triggers the cross protection subunit to start the MSP protection mechanism.
    若当前业务的信号流向为下行方向，当STM-1接口单元的同步传输OAM监测子单元监测到以太网告警时，同步传输OAM监测子单元在STM-1帧中***MS-AIS告警；远端设备监测到MS-AIS告警时，自动启动MSP保护机制；或者当STM-1接口单元的同步传输OAM监测子单元监测到以太网告警时，同步传输OAM监测子单元将STM-1帧中的自动保护倒换通路K2字节的第6、7、8比特均设置为1；远端设备收到K2的第6、7、8比特均为1时，自动启动MSP保护机制。If the current service signal flow direction is the downlink direction, when the synchronous transmission OAM monitoring subunit of the STM-1 interface unit detects the Ethernet alarm, the synchronous transmission OAM monitoring subunit inserts the MS-AIS alarm in the STM-1 frame; When the device detects the MS-AIS alarm, it automatically starts the MSP protection mechanism; or when the synchronous transmission OAM monitoring sub-unit of the STM-1 interface unit detects the Ethernet alarm, the synchronous transmission OAM monitoring sub-unit will automatically in the STM-1 frame. The sixth, seventh, and eighth bits of the protection switching path K2 byte are all set to 1; when the remote device receives the sixth, seventh, and eighth bits of K2, the MSP protection mechanism is automatically started.
  3. 一种基于权利要求1或2所述保护***的PTN设备中STM-1接入链路的保护方法，其特征在于，包括以下步骤：A method for protecting an STM-1 access link in a PTN device according to the protection system of claim 1 or 2, comprising the steps of:
    A、确定当前业务的信号流向，若当前业务的信号流向为上行方向，转到步骤B，若当前业务的信号流向为下行方向，转到步骤C；A, determine the current service signal flow, if the current service signal flow direction is the uplink direction, go to step B, if the current service signal flow direction is the downlink direction, go to step C;
    B、STM-1业务依次通过同步传输以太网接口、交叉保护以太网接口接入至PTN网络；当交叉保护单元中的以太网OAM监测子单元监测到LINK_LOS告警、或者AC帧中校验和FCS_EXC告警时，通过APS触发交叉保护子单元启动MSP保护机制；B. The STM-1 service is sequentially connected to the PTN network through the synchronous transmission Ethernet interface and the cross-protection Ethernet interface; when the Ethernet OAM monitoring sub-unit in the cross protection unit detects the LINK_LOS alarm or the AC frame checksum FCS_EXC When the alarm is triggered, the APS trigger cross protection subunit activates the MSP protection mechanism;
    C、当STM-1接口单元的同步传输OAM监测子单元监测到以太网告警时，同步传输OAM监测子单元在STM-1帧中***MS-AIS告警；远端设备监测到MS-AIS告警时，自动启动MSP保护机制；C. When the synchronous transmission OAM monitoring sub-unit of the STM-1 interface unit detects an Ethernet alarm, the synchronous transmission OAM monitoring sub-unit inserts an MS-AIS alarm in the STM-1 frame; when the remote device detects the MS-AIS alarm , automatically start the MSP protection mechanism;
    或者当STM-1接口单元的同步传输OAM监测子单元监测到以太网告警时，同步传输OAM监测子单元将STM-1帧中的自动保护倒换通路K2字节的第6、7、8比特均设置为1；远端设备收到K2的第6、7、8比特均为1时，自动启动MSP保护机制。 Or when the synchronous transmission OAM monitoring subunit of the STM-1 interface unit detects the Ethernet alarm, the synchronous transmission OAM monitoring subunit will block the sixth, seventh and eighth bits of the K2 byte of the automatic protection switching path in the STM-1 frame. Set to 1; when the remote device receives the 6th, 7th, and 8th bits of K2, it automatically starts the MSP protection mechanism.
  4. 如权利要求3所述保护***的PTN设备中STM-1接入链路的保护方法，其特征在于：步骤C中所述自动启动MSP保护机制包括以下步骤：根据GB/T 15941-2008第11.1条所规范的SDH线性MSP倒换方式和MSP自动启动准则，自动启动MSP保护机制。The method for protecting an STM-1 access link in a PTN device of the protection system according to claim 3, wherein the automatically starting the MSP protection mechanism in step C comprises the following steps: according to GB/T 15941-2008, 11.1 The SDH linear MSP switching mode and the MSP automatic start criterion specified in the article automatically start the MSP protection mechanism.
  5. 如权利要求3或4所述保护***的PTN设备中STM-1接入链路的保护方法，其特征在于：步骤C中所述以太网告警包括LINK_LOS告警或者MAC帧中校验和FCS_EXC告警。 The method for protecting an STM-1 access link in a PTN device of the protection system according to claim 3 or 4, wherein the Ethernet alarm in step C comprises a LINK_LOS alarm or a checksum FCS_EXC alarm in a MAC frame.
PCT/CN2015/089934 2014-09-22 2015-09-18 Stm-1 access link protection system and method in ptn device WO2016045538A1 (en)

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