CN100417082C

CN100417082C - Method for carrying out terminal management for passive optical network based on Ethernet

Info

Publication number: CN100417082C
Application number: CNB2005100356765A
Authority: CN
Inventors: 万俊华
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2005-06-30
Filing date: 2005-06-30
Publication date: 2008-09-03
Anticipated expiration: 2025-06-30
Also published as: CN1889450A

Abstract

A method for carrying out terminal management based on EPON includes connecting unit management system on optical line terminal based on EPON and setting up network management channel between them and between optical line terminal and each network terminal, carrying out analysis on message by optical line terminal when network management protocol message is sent to optical line terminal by unit management system, retransmitting message to network terminal by set up operation-maintenance channel when network protocol message is aimed at network terminal and retransmitting message reported from network terminal to unit management system by optical line terminal.

Description

To carry out the method for terminal management based on the EPON of Ethernet

Technical field

The present invention relates to communication technical field, relate in particular to a kind of method that EPON (EPON) based on Ethernet is carried out terminal management.

Background technology

In the increasing broadband access network of scale, the most existing Local Area Network all operates on the network of 100Mbit/s, and many large-scale commercial companies are to gigabit Ethernet (GE) transition.And online at metro core net and metro edge, Synchronous Optical Network (SONET)/synchronous digital level (SDH)/gigabit Ethernet (GE) bandwidth capacity is very abundant, and this makes Access Network partly produce serious bandwidth bottleneck.Compare with cable transmission, advantage such as Optical Fiber Transmission has that capacity is big, loss is little, anti-electromagnetic interference capability is strong, thereby, along with the cost of Optical Fiber Transmission progressively descends, the fiberize of the Access Network development trend that is inevitable.Representing access network segment of " last kilometer " part, Ultra Low Cost, simple structure are being arranged and be convenient to requirement such as realizations, realization has brought very big challenge to technology for this.And EPON (PON) has adopted passive device, is to realize the most potential technology of broadband light Access Network.

Classify from the content of carrying, EPON (PON) technology mainly comprises APON (ATMBased PONs, promptly based on the EPON of asynchronous transfer mode), EPON (Ethernet BasedPONs, promptly based on the EPON of Ethernet) and GPON (Gigabit PONs, i.e. gigabit passive optical network) etc.

As shown in Figure 1, EPON is a tree network normally, comprising that the optical line terminal (OLT) and a series of optical network unit (ONU) or the Optical Network Terminal (ONT) that is positioned at user resident that are positioned at central office (CO) constitute, is the Optical Distribution Network (ODN) that is made of optical fiber, passive optical splitters or coupler in the middle of these devices.In a PON network, can pull out simple optical fiber to the broadband services subarea or the office garden from service exchange, and then isolate some branch roads on each building or business device from main fiber with passive optical splitters or coupler.This mode can make a plurality of users share the relatively costly optical fiber link of this section from exchange to the user resident, thereby has also greatly reduced Fiber-To-The-Building (FTTB) and the use cost that Fiber to the home (FTTH).

The main international standard of EPON is IEEE802.3AH, has defined the function of OAM (operation management maintain) in the standard, comprises OAM frame head form and basic maintenance function.The main purpose of standard definition is in order to realize the failure diagnosis to terminal.

Be illustrated in figure 2 as the protocol stack diagram that defines in the EPON standard, MDI is a Medium Dependent Interface among the figure, and PHY is a physical layer, comprising: physical medium be correlated with sublayer PMD, physical medium additional sub PMA, Physical Coding Sublayer PCS, FEC is forward error correction.GMII is a Gigabit Media Independent Interface, and RS is a Reconciliation Sublayer, and OAM is the operation and maintenance sublayer.OLT is an optical line terminal, and ONU is an optical network unit.As can be seen from Fig. 2, OAM is the expansion content that is defined in MAC (media interviews control) upper strata, and there are this layer protocol stack respectively in OLT and ONU.OAM groundwork principle: the end by OLT or ONU is initiated OAM message, obtains the state information of opposite end in the opposite end by resolving OAM message, perhaps carries out the operation that the opposite end requires.

Loopback operation as shown in Figure 3, be to issue ONU in OAM layer structure loopback message by OLT, after the ONU terminal receives this loopback message, this message is sent back to OLT, if OLT receives this message, the OAM link of proof between from OLT to ONU is normal, illustrate that simultaneously the following carrying physical layer of OAM all is normal, otherwise physical layer and the MAC of explanation from OLT to ONU may break down.

More than be that employing ONU is that example describes, also can realize oam at ONT.Prior art adopt that the OAM passage carries out that terminal management mainly comprises in have:

A) far-end faulty indication: be used to refer to far-end fault warning state;

B) remote loopback: a kind of mechanism of supporting data link-layer frame one-level loopback mode is provided, can be used for diagnosing OAM whether normal with lower floor;

C) link management: mainly be to safeguard the link of OAM link, can expand with the upper strata.

The shortcoming of prior art aspect terminal management is not realize the complete content management, has only above listed simple fault information managing, has only unusual Content Management in other words, do not have the management to normal maintenance information.But commence business for operator, particularly after the terminal number increases to certain magnitude, just need to consider the complete management of terminal, comprise management, the management of terminal traffic, contents such as terminal capabilities and status detection for terminal interface.

Summary of the invention

Technical problem to be solved by this invention is: overcoming prior art can only realize simple fault information managing to the EPON terminal, the deficiency that can't manage normal maintenance information, a kind of method that manages at the EPON terminal is provided, thereby realizes complete management terminal.

The present invention solves the problems of the technologies described above the technical scheme that is adopted to be:

This method that EPON based on Ethernet is carried out terminal management comprises: connection device management system on based on the optical line terminal of the EPON of Ethernet, between them, set up network management channel (nmc); Increase Simple Network Management Protocol SNMP layer on the operation management maintenance protocol layer between optical line terminal and each network terminal, equipment management system is by setting up network management channel (nmc) between described SNMP layer and each network terminal; When equipment management system sends the NMP message to optical line terminal, optical line terminal is resolved this message, if at the NMP message of the network terminal, then the OM channel that this message is passed through to be set up is transmitted to this network terminal; The network terminal is transmitted to equipment management system to the message that equipment management system reports by optical line terminal.

When optical line terminal is transmitted to the network terminal with the NMP message, this message is carried in the payload of operation management maintain message.If what equipment management system sent to optical line terminal is NMP message at optical line terminal, then optical line terminal receives that the back directly handles; The message that optical line terminal reports directly reports equipment management system.The described network terminal can be optical network unit or Optical Network Terminal.

Beneficial effect of the present invention is: the present invention utilizes existing OAM management channels resource that EPON ONU terminal is managed, do not need additionally to define independently supervisory format, realized united net management to EPON OLT and EPON ONU terminal, make things convenient for O﹠M, after the EPON terminal use is more and more, will show its management advantage gradually.

The present invention is by the snmp protocol office terminal, this agreement is present international device management protocol, the MIB that defines on this agreement (management information bank) is the content that each producer observes jointly, contents such as the management of definition terminal interface, business configuration management, performance data and condition managing that only need be in MIB, each producer realizes organize content to terminal by this MIB, just can complete office terminal, can realize the intercommunication of each producer simultaneously.

The present invention reaches the EPON terminal and can run, and manageable purpose has realized comprising the complete management to terminal of terminal interface management, business configuration management, performance data and condition managing.

Description of drawings

Fig. 1 is a PON system configuration schematic diagram;

The protocol stack diagram of Fig. 2 for defining in the EPON standard;

Fig. 3 is a loopback operating principle schematic diagram;

Fig. 4 carries out the protocol stack diagram of terminal management for the present invention.

Embodiment

With embodiment the present invention is described in further detail with reference to the accompanying drawings below:

Because EPON adopts the OAM passage to come the office terminal, just can utilize the OAM passage of EPON to carry out expansion of content and perfect.The present invention is directed to the incomplete problem of current terminal management content, in conjunction with general in the world terminal management technology (TR062 administrative standard) the EPON terminal is managed at XDSL, the EPON terminal is reached can run, manageable purpose realizes comprising the complete management to terminal of terminal interface management, business configuration management, performance data and condition managing.

The present invention is based upon under the tree network, comprise EMS (Equipment managementsystem, be equipment management system), optical line terminal (OLT), a plurality of optical network unit (ONU1, ONU2 ... ONUn, here be that example describes with ONU, be equally applicable to Optical Network Terminal ONT) and Optical Distribution Network ODN.EPON OLT is connected with EMS, sets up the SNMP network management channel (nmc) between them, and sets up the SNMP network management channel (nmc) that is carried on the operation management maintenance protocol layer (OAM) between EPON OLT and each EPON ONU.

Shake hands by OAM message between EPON OLT and each the ONU terminal and set up the EPONOAM passage, guarantee that OAM bearing protocol layer is normal.Be to adopt SNMP (Simple Network Management Protocol) mode to manage between current EMS and the EPON OLT equipment, transportation protocol is followed SNMP V2 consensus standard between them.EPON OLT equipment is as the SNMP agent equipment of EPON ONU, and the unified SNMP message that receives from Network Management Equipment EMS learns that by analytic message message is at this equipment of OLT, still at ONU equipment.To in this module, handle at the message of OLT, the snmp management message of EPON ONU will be transmitted to EPON ONU equipment.It is same if the message that OLT reports directly report the SNMP message to give webmaster by OLT, and the message that ONU reports need be given OLT by the SNMP message reporting, is transmitted to network management system by OLT then.At inquiry of receiving or setting, the message major part of revising class need echo to webmaster should be acknowledging receipt of, and give network management system with the feedback information that webmaster need be understood.After EPON ONU receives the snmp management message, to EMS echo should, EPON OLT will directly transmit this message and give network management system.Aspect the OAM information encapsulation between EMS, EPON OLT and ONU, protocol stack as shown in Figure 4.

EMS can manage and comprise EPON OLT and EPON ONU/ONT, administrative message is unified to be the SNMP message format, by the agency of EPON OLT as SNMP, be responsible for to resolve the message of SNMP, if, then directly handle at the administrative message of EPON OLT equipment, be the SNMP message of EPON ONU else if, then this message is transmitted to EPON ONU terminal, this message is carried in the payload of EPON OAM message, and promptly the OAM message is removed the open-ended part outside the part that packet header defined.

Present device management system EMS can provide the SNMP mode that equipment is managed, and can provide administration interface to the user.Optical line terminal (OLT) can provide the SNMP agent functionality, can distinguish this equipment webmaster and at the webmaster content of EPON ONU, can handle the webmaster content that belongs to EPON OLT, forwarding belongs to the webmaster message of EPON ONU and gives EPON ONU terminal, and this administrative message is encapsulated in the payload of EPON OAM message, simultaneously, if receive the message that reports of EPON ONU, can be transmitted to the facility network guard system.(ONU1 ONU2...ONUn) can receive EPON OAM administrative message to optical network unit, and resolves the SNMP message content, after the execution, can send response message to EMS.

Adopt the SNMP mode can define MIB (management information bank) organize content of standard to terminal management, content comprises information such as terminal interface management, business configuration management, performance data and condition managing.The present invention is by the snmp protocol office terminal, this agreement is present international device management protocol, the mib file that defines on this agreement is the content that each producer observes jointly, contents such as the management of definition terminal interface, business configuration management, performance data and condition managing that only need be in MIB, each producer realizes organize content to terminal by this MIB, just can complete office terminal, can realize the intercommunication of each producer simultaneously.

Like this, the present invention utilizes existing OAM management channels resource that EPON ONU terminal is managed, and does not need additionally to define independently supervisory format.Adopt the present invention can also realize the united net management of EPONOLT and EPON ONU terminal, make things convenient for O﹠M, after the EPON terminal use is more and more, will show its management advantage gradually.

Those skilled in the art do not break away from essence of the present invention and spirit, can there be the various deformation scheme to realize the present invention, the above only is the preferable feasible embodiment of the present invention, be not so limit to interest field of the present invention, the equivalent structure that all utilizations specification of the present invention and accompanying drawing content are done changes, and all is contained within the interest field of the present invention.

Claims

1. method to carrying out terminal management based on the EPON of Ethernet is characterized in that comprising:

Connection device management system on based on the optical line terminal of the EPON of Ethernet is set up network management channel (nmc) between them;

Increase Simple Network Management Protocol SNMP layer on the operation management maintenance protocol layer between optical line terminal and each network terminal, equipment management system is by setting up network management channel (nmc) between described SNMP layer and each network terminal;

When equipment management system sends the NMP message to optical line terminal, optical line terminal is resolved this message, if at the NMP message of the network terminal, then the OM channel that this message is passed through to be set up is transmitted to this network terminal; The network terminal is transmitted to equipment management system to the message that equipment management system reports by optical line terminal.

2. according to claim 1 to carry out the method for terminal management based on the EPON of Ethernet, it is characterized in that: when optical line terminal is transmitted to the network terminal with the NMP message, this message is carried in the payload of operation management maintain message.

3. according to claim 1 and 2 to carry out the method for terminal management based on the EPON of Ethernet, it is characterized in that: if equipment management system sends to optical line terminal is NMP message at optical line terminal, then optical line terminal receives that the back directly handles; The message that optical line terminal reports directly reports equipment management system.

4. the method to carrying out terminal management based on the EPON of Ethernet according to claim 3 is characterized in that: the described network terminal is optical network unit or Optical Network Terminal.