CN1756175A - Passive optical network protection switching method and system and optical circuit terminal access card - Google Patents
Passive optical network protection switching method and system and optical circuit terminal access card Download PDFInfo
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Abstract
The invention provides a protect-switch method in the passive optical network system, which is characterized in following steps: first, the optical terminal sets the first passive optical network as the working chain circuit, and the second passive optical network as the redundant chain circuit, to make the optical network unit operate the ascending-descending data transmission between said working chain circuit and said optical terminal; said optical terminal periodically detects the condition of said working chain circuit and switches said redundant chain circuit into said working chain circuit when the working circuit is abnormal, to make said optical network unit continuously operate the ascending-descending data transmission between said working chain circuit and said optical terminal. The invention also provides a relative protect-switch system and a optical terminal access card. The invention can save the redundant optical fiber and redundant devices needed in the protect-switch and reduce the time of protect-switch.
Description
Technical field
Present invention relates in general to telecommunications network, and relate more specifically to the APS technology in the telecommunications network.
Background technology
Directly by optical fiber wideband data is being sent to aspect the various terminal uses, the effect of EPON (PON) becomes more important.Along with being showing improvement or progress day by day of Fiber to the home (FTTH) technology, also constantly enlarge for the demand of PON The Application of Technology.Different commercial products based on the ITU-983 standard have obtained using widely in network.For PON network of future generation, mainly contain two developing direction: one is based on gigabit towards the ITU-TG.984 protocol family of full-service than EPON (GPON), and two are based on the ethernet passive optical network (EPON) of the standard IEEE 802.3ah agreement of Ethernet in optical access network.
About the Switchover mechanism of GPON, can be with reference to the GPON standard " ITU is Characteristics forGigabit-capable Passive Optical Networks (GPON) G.984.1:General " of standardization department of international telecommunication union telecommunication.This standard is switched scheme having continued to use ITU-T protection for the detailed definition of broadband passive optical network (BPON) in " ITU is OpticalAccess System Based on Passive Optical Networks G.983.1:Broadband " and " ITU is Broadband Optical Access System with Enhanced Survivability G.983.5:A " on the Switchover mechanism.Mainly be divided into simple line protection reverse type A and B, and towards the general protection Type C of optical network unit (ONU), optical line terminal (OLT).Type A and B are fairly simple, can only protect fibre circuit and the OLT of OLT to passive beam splitter, less application in the practical application.Type C is the complete protection at ONU, Optical Distribution Network (ODN) and OLT, can realize 1: 1,1+1, X: N protection.
Figure 1A is that 1: 1 of the C type and 1+1 protection are switched the scheme schematic diagram in the GPON network system; Figure 1B is that the scheme schematic diagram is switched in the X of C type in the GPON network system: N protection.Because the protection switch function need increase fibre circuit and equipment exponentially, causes the cost increase of network very big.Even have only an ONU to need protection, also must be equipped with double OLT and ODN.For example, suppose to have only among Figure 1A ONU 1 to need protection, then also must be equipped with double OLT (being PON LT (1) and the PON LT (0) among Figure 1A) and double ODN (that is two optical branching devices shown in Figure 1A).Among Figure 1B, need redundant OLT and the ODN number that is equipped with more.Therefore, the protection scheme of switching among the GPON of prior art has increased network cost.
EPON is by EPON standard " the IEEE DraftP802.3ah TM/D2.0 " regulation of IEEE, and this standard is the continuity of Ethernet on optical access network.In order to guarantee compatibility with the Ethernet standard, in the EPON standard not the regulation protection switch scheme.But exist the multiple service supporting problem among the EPON, particularly the carrying of time division multiplexing voice service.Therefore, realize that in EPON carrier-class service protection switch function is very necessary.Prior art has been carried out the expansion of protection switch function to the EPON network, and the extra traffic transfer function is provided on slack, but does not solve the complicated problem of PON network protection switching equipment.The complicated increase that directly causes network cost of protection switching equipment.
In addition, though EPON and GPON have own different technology, towards different application scenarioss, both have identical network topology structure and similar network management structure, are not to merge.The PON access device of future generation that merges the GPON/EPON technology becomes development trend.That is to say that same equipment can provide EPON and GPON access service simultaneously according to different user's requests, and unified network management allocative abilities is provided simultaneously.Also not only do not support GPON but also support the protection of EPON to switch scheme in the prior art.
Summary of the invention
The objective of the invention is to solve the above-mentioned problems in the prior art, a kind of protection reverse method that is used for passive optical network is provided, protects exchanging system and be used for the optical line terminal access card that protection of the present invention is switched.
For this reason; the invention provides a kind of protection reverse method that is used for passive optical network; described passive optical network comprises first EPON, second EPON, optical line terminal and optical network unit, and described method is characterised in that and may further comprise the steps:
Described first EPON that described optical line terminal connects described optical network unit is set to active link, makes described optical network unit carry out the up-downgoing transfer of data with described optical line terminal on described active link;
Described second EPON that described optical line terminal connects described optical network unit is set to redundant link, so that utilize described redundant link that described active link protection is switched.
The present invention also provides a kind of protection exchanging system that is used for passive optical network, comprising:
First EPON;
Second EPON;
Optical line terminal;
Optical network unit;
It is characterized in that:
Described optical network unit is connected with described optical line terminal with described second EPON through described first EPON respectively;
Described first EPON of described optical line terminal is set to active link, and described second EPON is set to redundant link;
Described optical network unit carries out the up-downgoing transfer of data with described optical line terminal on described active link, and utilizes described redundant link that described active link protection is switched.
The present invention also provides a kind of passive optical network optical line terminal access card, it is characterized in that comprising:
The first physical layer process device and the first media access control layer processing unit are used for the optical network unit up-downgoing data of first EPON are handled;
The second physical layer process device and the second media access control layer processing unit are used for the optical network unit up-downgoing data of second EPON are handled; And
Multiplexing/as to select module, according to the be provided with situation of optical line terminal to active link, optionally to/from described first media access control layer processing unit or the described second media access control layer control and treatment device transmission/reception data.
Protection reverse method of the present invention and equipment can satisfy the requirement that specific ONU is provided the protection switch function under the situation that does not influence first EPON and the second EPON operate as normal.The present invention utilizes two EPONs as active link and redundant link, thus saved the protection switch in required slack and redundance unit.Simultaneously, because two EPONs work simultaneously, protecting when switching, the necessary process when waiting EPON to start of need not to restart to find range has reduced the time of switching of protecting.
Description of drawings
Figure 1A is that 1: 1 of the C type and 1+1 protection are switched the scheme schematic diagram in the GPON network system;
Figure 1B is that the scheme schematic diagram is switched in the X of C type in the GPON network system: N protection;
Fig. 2 is the schematic configuration diagram that realizes according to the EPON of protection reverse method of the present invention;
Fig. 3 is the schematic configuration diagram according to the OLT access card that adopts in the protection reverse method of the present invention.
Embodiment
Embodiments of the present invention are described with reference to the accompanying drawings.
Figure 1A and Figure 1B are in the existing description of preamble.
Fig. 2 is the schematic configuration diagram that realizes according to the EPON of protection reverse method of the present invention.Fig. 2 schematically shows two independently EPONs, i.e. PON 0 and PON1.Comprise a plurality of optical network units (ONU) among each PON, i.e. ONU 1 to ONU N.Certainly, the quantity of the ONU among each PON needn't be identical.Among each PON, a plurality of ONU insert corresponding optical line terminal (PON OLT 0 among Fig. 2 or PON OLT 1) by corresponding optical branching device (optical branching device 0 among Fig. 2 or optical branching device 1).OLT access card of label 101 expressions among Fig. 2.In this embodiment of the invention, the OLT end is realized in same OLT access card 101 for the access of PON 0 and PON 1.
In the example shown in Figure 2, supposing to have only ONU 1 is the ONU that defencive function need be provided for it.ONU 1 is connected among PON 0 and the PON 1 simultaneously.Can suppose that PON 0 is an active link, PON 1 is a redundant link with being without loss of generality.
For the transmission of down direction, at the OLT end, OLT access card 101 will send to the service duplication of ONU 1 in redundant link PON 1 through active link PON 0.Like this, downlink business arrives ONU 1 by optical branching device 0 and optical branching device 1 respectively.ONU 1 optionally receives the two-way business according to the condition of acceptance of setting.
For the transmission of up direction, at ONU 1 end, ONU 1 sends to business to be sent respectively among PON 0 and the PON 1.Uplink service reaches PON OLT 0 and PON OLT 1 by optical branching device 0 and optical branching device 1 respectively.Because OLT access card 101 is supported the access of PON 0 and PON 1 simultaneously, so can optionally receive the uplink service that sends through ONU 1 according to predetermined conditions easily.
By with upper type, realized that 1+1 protection switches.
In addition, can make active link PON 0 carry different business respectively,, realize protection in 1: 1 so that increase the bandwidth of ONU 1 with redundant link PON 1.
Need to prove that at this PON 0 among Fig. 2 and PON 1 can be homogeneous networks, for example be all EPON or be all GPON; Also can plant network for difference, for example, PON 0 is EPON, and PON 1 is GPON.The variety classes of PON is not construed as limiting the invention.
Fig. 3 is according to the schematic configuration diagram of the OLT access card that adopts in the protection reverse method of the present invention as shown in Figure 3, and shielded ONU 1 is connected with OLT access card 101 with PON 1 by PON 0 respectively.Comprise in the OLT access card 101 multiplexing/select module 201, two physical layer block (being physical layer 0 and physical layer 1), two GTC/EMAC layer modules (being GTC/EMAC layer 0 and GTC/EMAC layer 1) and corresponding interface buses.Two GTC/EMAC layer modules are respectively the second layer processing module of PON 0 and PON 1.For GPON, the second layer is transmission convergence layer (TC).For EPON, the second layer is media access control layer (MAC).GTC/EMAC layer 0 and GTC/EMAC layer 1 interface bus by separately with multiplexing/select module 201 to be connected.Multiplexing/as to select 201 pairs of business of module to carry out multiplexing or selection, and link to each other with external data bus.
In order to realize the protection switchover mode of 1+1, at down direction, in the OLT access card 101 multiplexing/select module 201 with the service duplication among the ONU 1 active link PON 0 to redundant link PON 1.The two-way business is passed through the second layer (GTC/EMAC layer 0 and GTC/EMAC layer 1) and the physical layer (physical layer 0 and physical layer 1) of PON 0 and PON 1 respectively successively and is handled, and arrives ONU 1 by corresponding fibre circuit then.Be arranged on the data multiplex/selection module 202 among the ONU 1,,, optionally receive from the data of PON 0 or from the data of PON 1 perhaps according to the physical layer management maintenance instruction of OLT according to setting in advance.At up direction, ONU 1 sends upstream data via active link PON 0 and redundant link PON 1 respectively by data multiplex/selection module 202.In OLT access card 101, upstream data passes through the physical layer (physical layer 0 and physical layer 1) and the second layer (GTC/EMAC layer 0 and GTC/EMAC layer 1) of PON 0 and PON 1 respectively and is handled, via interface bus access multiplexing/selection module 201 separately.Multiplexing/as to select module 202 according to the condition of setting, parameters such as error rate size, time delay, shake for example optionally receive from the professional of active link PON 0 with from the business of redundant link PON 1.
When active link PON 0 is unusual, initiates protection by OLT and switch.OLT access card 101 regularly detects link circuit condition, checks the trigger condition of whether satisfying the demand and switching, and for example checks situations such as ONU loses, the deterioration of the circuit error rate whether occur.Switch trigger condition if satisfy, then OLT access card 101 Control Network startup protection is switched.OLT access card 101 is switched order by the transmission of physical layer management maintenance channel on protection circuit.ONU 1 finishes switching action according to order, that is, the data multiplex among the ONU 1/selection module 202 is selected to receive data from redundant circuit PON 1.ONU 1 reports related news to OLT access card 101 simultaneously, to show operating state; OLT access card 101 is tested after receiving the message that reports, and upgrades various status registers.
In order to realize 1: 1 protection switchover mode, at down direction, in OLT access card 101 multiplexing/select the downlink business of 201 couples of ONU 1 of module to sort.By active link PON 0 carrying high-priority service.When the bandwidth that provides as active link PON 0 is not enough to support whole downlink business of ONU 1, by the remaining downlink business of redundant link PON 1 carrying.Data multiplex among the ONU 1/selection module 202 receives the downlink data of PON 0 and PON 1 transmission respectively, and is multiplexed into the data/address bus of ONU 1 end.At up direction, the data multiplex among the ONU 1/selection module 202 is at first carried the uplink service of high priority by active link PON 0.When the bandwidth that provides as active link PON 0 can not satisfy the needs of ONU1 uplink service, then by the remaining uplink service of PON 1 carrying.Because active link PON 0 and redundant link PON 1 equal bearer service, so the multiplexing/selection module 201 in the OLT access card 101 is multiplexed into the unification of two-way upstream data the data/address bus of OLT end.
The implementation that protection in 1: 1 is switched is identical with the implementation that 1+1 protection is switched, and repeats no more.
According to existing standard, broadband passive optical network (BPON) is switched scheme with the shared unified protection of GPON.In above-mentioned execution mode of the present invention, be used to carry and protect the concrete definition of switching the physical layer management maintenance channel as shown in table 1.
Table 1 BPON/GPON protection switching messages form
| Descending protection switching messages | ||
| Byte | Content | Describe |
| 35 | 01000000 or PON_ID | Broadcast identification or concrete ONU sign |
| 36 | 10000000 | Protection switching messages sign |
| 37 | Linenumber | The chain line |
| 38 | Control | K1 byte (in G.783, defining) |
| 39 | Control | K2 byte (in G.783, defining) |
| 40..46 | Undefined | |
| Up protection switching messages | ||
| Byte | Content | Describe |
| 2 | PON_ID | The ONU sign |
| 3 | 10000010 | Protection switching messages sign |
| 4 | Linenumber | The chain line |
| 5 | Control | K1 byte (in G.783, defining) |
| 6 | Control | K2 byte (in G.783, defining) |
| 7..13 | Undefined | |
In the standard of the IEEE EPON that passes through recently, do not relate to protect networks and switch scheme.But equally also there is the carrying problem of carrier class business in EPON, is necessary for it optional protection switch function is provided.Need these two kinds of networks of compatible BPON/GPON and EPON on the follow-on PON network design, and unified management platform is provided.Therefore, the present invention switches expansion for the EPON network provides protection, so that provide unified, the manageable switch function of being responsible to replace for EPON and BPON/GPON on the comprehensive PON network platform.
Function according to PON is divided, and the management function that belongs to the physical layer in the PON equipment is switched in protection.Therefore in EPON, should expand, so that make network layer divide clear and be convenient to network management in management layer.The EPON standard has been expanded 5 kinds of control frames that are used to realize point-to-multipoint (P2MP) on Ethernet MAC layer.As shown in table 2, this programme extended operation sign indicating number (Opcode) PON network segment of being designated 00-07 is on this basis followed the tracks of (PST-Section Trace) frame, is used for realizing the protection switch function.
Multiple spot control operation maintenance management message (MPCP OAM) among table 2 EPON
| MPCPDU | Command code | Reference |
| Gate | 00-02 | IEEE Draft P802.3ah TM64.4.2 |
| Report | 00-03 | IEEE Draft P802.3ah TM64.4.3 |
| Register_Req | 00-04 | IEEE Draft P802.3ah TM64.4.4 |
| Register | 00-05 | IEEE Draft P802.3ah TM64.4.5 |
| Register_Ack | 00-06 | IEEE Draft P802.3ah TM64.4.6 |
| PST | 00-07 | Description among the present invention |
For the ease of unified network management, the frame format of PST frame is mainly with reference to the description in the table 1, and concrete form is as shown in table 3.EPON up-downgoing PST frame is identical, and wherein K1, K2 message and link are represented shown in relevant information in the table 1, so that realize the unified management for EPON and GPON.
Table 3 EPON PST frame format
| The EPON leading part | Lead code | 5 bytes |
| LLID | 2 | |
| CRC | ||
| 1 byte | ||
| The EPON stem | Destination address | 6 bytes |
| Source address | 6 bytes | |
| Type identification (88-08) | 2 bytes |
| The EPON payload | PST command code (00-07) | 2 bytes |
| Time stab information | 4 bytes | |
| The | 1 byte | |
| K1(G.783) | 1 byte | |
| K2(G.783) | 1 byte | |
| Fill area | ||
| The data check value | 4 bytes |
Though described embodiments of the present invention in conjunction with the accompanying drawings, those skilled in the art can make various distortion or modification within the scope of the appended claims in this area.
Claims (15)
1. protection reverse method that is used for passive optical network, described passive optical network comprises first EPON, second EPON, optical line terminal and optical network unit, described method is characterised in that and may further comprise the steps:
Described first EPON that described optical line terminal connects described optical network unit is set to active link, makes described optical network unit carry out the up-downgoing transfer of data with described optical line terminal on described active link;
Described second EPON that described optical line terminal connects described optical network unit is set to redundant link, so that utilize described redundant link that described active link protection is switched.
2. protection reverse method according to claim 1, to carry out the step of up-downgoing transfer of data further comprising the steps of with described optical line terminal on described active link to it is characterized in that described optical network unit:
When transmitting uplink data, the upstream data that described optical network unit will send to described active link copies to described redundant link, send upstream data to described optical line terminal simultaneously by described active link and described redundant link, and described optical line terminal receives described upstream data from described active link;
When downlink data transmission, described optical line terminal copies to described redundant link with the downlink data of described optical network unit, send downlink data to described optical network unit simultaneously by described active link and described redundant link, and described optical network unit receives described downlink data from described active link;
Described optical line terminal detects the situation of described active link termly, and occur when unusual in described active link situation, described redundant link switched be new active link, make that described optical network unit continues to carry out the up-downgoing transfer of data with described optical line terminal on described new active link.
3. protection reverse method according to claim 1, to carry out the step of up-downgoing transfer of data further comprising the steps of with described optical line terminal on described active link to it is characterized in that described optical network unit:
When transmitting uplink data, described optical network unit sends the upstream data of high priority to described optical line terminal by described active link, when the bandwidth that provides when described active link can not satisfy the up demand of described optical network unit, described optical network unit sends remaining upstream data by described redundant link to described optical line terminal, and described optical line terminal carries out multiplexing reception to described upstream data;
When downlink data transmission, described optical line terminal sends the downlink data of high priority to described optical network unit by described active link, when the bandwidth that provides when described active link can not satisfy the downstream-on-demand of described optical network unit, described optical line terminal sends remaining downlink data by described redundant link to described optical network unit, and described optical network unit carries out multiplexing reception to described downlink data.
4. protection reverse method according to claim 1, what it is characterized in that described first EPON and described second EPON are broadband passive optical network, gigabit than in EPON and the ethernet passive optical network is at least a.
5. protection reverse method according to claim 4; it is characterized in that in ethernet passive optical network described optical line terminal is new active link by sending control frame in the media access control layer to described optical network unit and initiate and indicating described redundant link switched.
6. protection exchanging system that is used for passive optical network comprises:
First EPON;
Second EPON;
Optical line terminal;
Optical network unit;
It is characterized in that:
Described optical network unit is connected with described optical line terminal with described second EPON through described first EPON respectively;
Described first EPON of described optical line terminal is set to active link, and described second EPON is set to redundant link;
Described optical network unit carries out the up-downgoing transfer of data with described optical line terminal on described active link, and utilizes described redundant link that described active link protection is switched.
7. protection exchanging system according to claim 6 is characterized in that:
When transmitting uplink data, the upstream data that described optical network unit will send to described active link copies to described redundant link, send upstream data to described optical line terminal simultaneously by described active link and described redundant link, and described optical line terminal receives described upstream data from described active link;
When downlink data transmission, described optical line terminal copies to described redundant link with the downlink data of described optical network unit, send downlink data to described optical network unit simultaneously by described active link and described redundant link, and described optical network unit receives described downlink data from described active link;
And it is characterized in that described optical line terminal also comprises:
Checkout gear is used for detecting termly the situation of described active link,
Wherein detecting described active link situation at described checkout gear occurs when unusual, described optical line terminal indication is switched described redundant link and is new active link, thereby described optical network unit continues to carry out the up-downgoing transfer of data with described optical line terminal on described new active link.
8. protection exchanging system according to claim 6 is characterized in that:
When transmitting uplink data, described optical network unit sends the upstream data of high priority to described optical line terminal by described active link, when the bandwidth that provides when described active link can not satisfy the up demand of described optical network unit, described optical network unit sends remaining upstream data by described redundant link to described optical line terminal, and described optical line terminal carries out multiplexing reception to described upstream data;
When downlink data transmission, described optical line terminal sends the downlink data of high priority to described optical network unit by described active link, when the bandwidth that provides when described active link can not satisfy the downstream-on-demand of described optical network unit, described optical line terminal sends remaining downlink data by described redundant link to described optical network unit, and described optical network unit carries out multiplexing reception to described downlink data.
9. protection exchanging system according to claim 6, what it is characterized in that described first EPON and described second EPON are broadband passive optical network, gigabit than in EPON and the ethernet passive optical network is at least a.
10. protection exchanging system according to claim 9; it is characterized in that in ethernet passive optical network described optical line terminal is new active link by sending control frame in the media access control layer to described optical network unit and initiate and indicating described redundant link switched.
11. a passive optical network optical line terminal access card is characterized in that comprising:
The first physical layer process device and the first media access control layer processing unit are used for the optical network unit up-downgoing data of first EPON are handled;
The second physical layer process device and the second media access control layer processing unit are used for the optical network unit up-downgoing data of second EPON are handled; And
Multiplexing/as to select module, according to the be provided with situation of optical line terminal to active link, optionally to/from described first media access control layer processing unit or the described second media access control layer control and treatment device transmission/reception data.
12. according to the optical line terminal access card of claim 11, it is characterized in that described multiplexing/select module
When transmitting uplink data, to selecting from the upstream data of described first media access control layer processing unit and the described second media access control layer processing unit, and the upstream data after will selecting is sent to data/address bus according to network condition;
When downlink data transmission, downlink data is sent to described first media access control layer processing unit and the described second media access control layer processing unit.
13. optical line terminal access card according to claim 11, it is characterized in that described multiplexing/select module
When transmitting uplink data, to carrying out multiplexing reception, and the upstream data after multiplexing is sent to data/address bus from the high priority upstream data of the described first media access control layer processing unit with from the residue upstream data of the described second media access control layer processing unit;
When downlink data transmission, send the downlink data of high priority to the described first media access control layer processing unit, when the bandwidth that provides when described first passive network can not satisfy downstream-on-demand, send remaining downlink data to the described second media access control layer processing unit.
14. optical line terminal access card according to claim 11, it is characterized in that described multiplexing/select module be asynchronous transfer mode multiplexing/select module and ether multiplexing/select at least a in the module.
15. optical line terminal access card according to claim 14; it is characterized in that ether multiplexing/select module to send control frame in the media access control layer to optical network unit by media access control layer processing unit and physical layer process device, initiate and indication is protected between described first EPON and described second EPON and switched.
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| CN101150361B (en) * | 2006-09-20 | 2011-06-22 | 北京格林威尔科技发展有限公司 | A method and system for realizing fully protective switching in passive optical network |
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| CN101350679B (en) * | 2007-07-18 | 2012-09-05 | 华为技术有限公司 | Protection switching method, system and equipment based on Ethernet passive optical network |
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| CN101150361B (en) * | 2006-09-20 | 2011-06-22 | 北京格林威尔科技发展有限公司 | A method and system for realizing fully protective switching in passive optical network |
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| CN101741592B (en) * | 2008-11-13 | 2012-01-04 | 华为技术有限公司 | Method, device and system for managing GPON branch in multi-service transmitting network |
| CN101667865A (en) * | 2009-09-30 | 2010-03-10 | 中兴通讯股份有限公司 | Device for realizing protection switching in wavelength division multiplexing passive optical network (WDM PON), system and method therefor |
| WO2010145601A1 (en) * | 2009-09-30 | 2010-12-23 | 中兴通讯股份有限公司 | Device, system and method for performing protection switch in wavelength division multiplexing passive optical network |
| CN101667865B (en) * | 2009-09-30 | 2013-07-03 | 中兴通讯股份有限公司 | Device for realizing protection switching in wavelength division multiplexing passive optical network (WDM PON), system and method therefor |
| CN103281600A (en) * | 2013-06-03 | 2013-09-04 | 上海斐讯数据通信技术有限公司 | Method for identifying ONU types |
| CN106936494A (en) * | 2015-12-29 | 2017-07-07 | 上海贝尔股份有限公司 | A kind of EPON protection system and its device |
| CN106936494B (en) * | 2015-12-29 | 2019-10-01 | 上海诺基亚贝尔股份有限公司 | A kind of passive optical network protection system and its apparatus |
| CN113746537A (en) * | 2020-05-29 | 2021-12-03 | 中国电信股份有限公司 | Protection device and method for passive optical network link |
| CN113746537B (en) * | 2020-05-29 | 2023-03-24 | 中国电信股份有限公司 | Protection device and method for passive optical network link |
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