CN106452565A - Double-PON double-MAC protection power collection device and working method thereof - Google Patents
Double-PON double-MAC protection power collection device and working method thereof Download PDFInfo
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- CN106452565A CN106452565A CN201510491155.4A CN201510491155A CN106452565A CN 106452565 A CN106452565 A CN 106452565A CN 201510491155 A CN201510491155 A CN 201510491155A CN 106452565 A CN106452565 A CN 106452565A
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Abstract
The invention discloses a double-PON double-MAC protection power collection device and a working method thereof. The device comprises a first optical module, a second optical module, a first PON-MAC chip, a second PON-MAC chip, and a selector circuit. The first optical module is connected with an external first optical line terminal OLT1 through an optical fiber network, and the second optical module is connected with an external second optical line terminal OLT2 through the optical fiber network. The first optical module is also connected with the selector circuit through the first PON-MAC chip. The second optical module is connected with the selector circuit through the second PON-MAC chip. The first PON-MAC chip is also connected with the second PON-MAC chip. The selector circuit is also connected with power equipment through an external switcher.
Description
Technical field
The present invention relates to electric power technical field of optical network communication, in particular it relates to a kind of couple of PON couple of MAC
The electric power acquisition device of protection and its method of work.
Background technology
EPON (Ethernet Pass ive Optical Network, Ethernet passive optical network) light chain
The function of road protection is the function that power domain is paid special attention to, and defines 4 kinds in China Telecom's standard
Protection form：Type A, Type B, Type C and Type D.In the actual application of EPON,
Also there is a kind of hand-in-hand protection form.
In terms of technical standpoint, protection type is the upgrade version of Type D hand in hand, due to type of handing in hand
Protective capability is better than Type D, therefore protection is more liked by user hand in hand.In existing protection scheme hand in hand,
Directly telecommunications EPON is applied in electric power digital transformer station and distribution automation project, be usually used 2
Individual independent ONU (Optical Network Unit, optical network unit) equipment connects OLT (optical
Line terminal, optical line terminal), ONU equipment connects switch simultaneously, as shown in Figure 1.
By to the research of existing hand pulling type scheme above and examining of actual electric power acquisition terminal applies environment
Amount is it is easy to find that prior art suffers from the drawback that：
(1) the synchronous demand of power system precision clock cannot, be met.
(2), the technology of 50ms redundancy switch protecting realizes difficulty than larger.
(3), (Generic Object Oriented Substation Event, towards logical for GOOSE
Transformer substation case with object) message low time delay is not readily reachable by.
(4), total system scheme power consumption is high.
(5), two independent ONU equipment increase system cost.
(6), 2 ONU are required for connecting switch, reduce switch port utilization rate.
Content of the invention
Extremely it is easily caused electric power acquisition communication system failure in order to solve optical fiber link in prior art
Technical problem, the present invention proposes electric power acquisition device and its work of a kind of couple of PON double MAC protection
Method.
The electric power acquisition device of double PON of the present invention double MAC protection, including：
First optical module, the second optical module, a PON-MAC chip, the 2nd PON-MAC chip, choosing
Select device circuit；
Described first optical module is connected with outside first optical line terminal OLT 1 by fiber optic network, and described
Two optical modules are connected with outside second optical line terminal OLT 2 by fiber optic network；
Described first optical module is connected with described selector circuit also by a described PON-MAC chip,
Described second optical module is connected with described selector circuit also by described 2nd PON-MAC chip；
A described PON-MAC chip is also connected with described 2nd PON-MAC chip；Described selector electricity
Road connects power equipment also by external switch.
In technique scheme, when the optical link protection form of fiber optic network is to protect form hand in hand,
Described OLT1, OLT2 are different OLT；
When the optical link protection form of fiber optic network is Type D protection form, described OLT1, OLT2
It is same OLT.
In technique scheme, described PON-MAC chip is SGC3001 chip.
In technique scheme, described selector circuit is complex programmable logic device (CPLD).
In technique scheme, described PON-MAC chip includes：Universal asynchronous receiving-transmitting transmitter serial ports
UART, a described PON-MAC chip is connected with described PON-MAC chip by UART；
A described PON-MAC chip, described 2nd PON-MAC chip pass through UART and described choosing respectively
Select device circuit to be connected.
In technique scheme, described PON-MAC chip also includes：Input/output interface I/O, described
First PON-MAC chip, described 2nd PON-MAC chip pass through described I/O and described selector respectively
Circuit is connected.
In technique scheme, described PON-MAC chip also includes：Temporal information interface TOD, described
First PON-MAC chip, described 2nd PON-MAC chip pass through described TOD and described selector respectively
Circuit is connected.
In technique scheme, described PON-MAC chip also includes：Gigabit GMII GMII,
A described PON-MAC chip, described 2nd PON-MAC chip are respectively by described GMII and described choosing
Select device circuit to be connected.
In technique scheme, described PON-MAC chip also includes：Management data input/output interface
MDIO, a described PON-MAC chip, described 2nd PON-MAC chip respectively pass through described MDIO with
Described selector circuit is connected.
In technique scheme, described selector circuit includes：Management data input/output interface MDIO,
Gigabit ethernet interface GE, described selector circuit by described MDIO, GE respectively with external switch phase
Even.
The electric power acquisition device of double PON of the present invention double MAC protection, compared with prior art, tool
There is following technique effect：1st, by using low-power consumption PON-MAC chip, there is low excellent of equipment power dissipation
Point.2nd, using the ONU chip with hardware TOD interface and CPLD, it is possible to achieve single fiber chain
The clock jitter degree of accuracy that road fault causes, solve prior art cannot meet power system accurate when
The synchronous problem of clock.3rd, prior art carries out link protection hand in hand using 2 single ONU equipment,
When single fiber breaks down, switching time is long, easy frame losing.Present invention achieves on single pcb board
Double ONU equipment, community network data buffer storage simultaneously, switching time is fast, not frame losing.And only use
1 exchange interface, system cost is low.4th, prior art needs webmaster, OLT to configure simultaneously
2 ONU equipment, the present invention only needs to configure primary ONU equipment, and main ONU equipment can be by configuration letter
Breath is synchronized to standby ONU equipment, reduces the management complexity of webmaster and OLT.
The method of work of the electric power acquisition device of double PON of the present invention double MAC protection, including：
First PON-MAC chip, the 2nd PON-MAC chip are according to the PON mouth receiving from selector circuit
Selection signal PON_IF_ID determines primary PON mouth and standby PON mouth, and described PON mouth includes PON-MAC
Chip and connected optical module；
The OLT connecting described primary PON mouth sends OAM frame to electric power acquisition device, to obtain described electricity
A PON-MAC chip, the state of the 2nd PON-MAC chip and information that force acquisition device returns；
Connect the OLT of described primary PON mouth and described electric power acquisition device monitor optical link state respectively,
When optical link breaks down, start optical path switching.
In technique scheme, described OLT and described electric power acquisition device monitor optical link state respectively,
When optical link breaks down, start optical path switching and include：
When the OLT connecting described primary PON mouth monitors trunk optical fiber link failure, then close and be somebody's turn to do
The sending function of the optical module that the PON mouth of OLT is connected, described trunk optical fiber link be OLT to beam splitter it
Between optical fiber link；
When described electric power acquisition device monitoring is to trunk optical fiber link failure, then by itself standby PON mouth
Switch to primary PON mouth.
In technique scheme, described OLT and described electric power acquisition device monitor optical link state respectively,
When optical link breaks down, start optical path switching and also include：
When the described OLT connecting described primary PON mouth monitors the light splitting fibre chain of described electric power acquisition device
When road is abnormal, then report and alarm event, described point of optical fiber link is the optical fiber chain to beam splitter for the ONU
Road；
When described electric power acquisition device monitoring to point optical fiber link abnormal when, then itself standby PON mouth is cut
It is changed to primary PON mouth.
The method of work of the electric power acquisition device of double PON of the present invention double MAC protection, with existing skill
Art is compared, and has following technique effect：1st, by using low-power consumption PON-MAC chip, there is equipment
Advantage low in energy consumption.2nd, using the ONU chip with hardware TOD interface and CPLD, Ke Yishi
The clock jitter degree of accuracy that existing single fiber link failure causes, solves prior art and cannot meet electric power
The synchronous problem of system precision clock.3rd, prior art is pulled using 2 single ONU equipment
Handss link protection, when single fiber breaks down, switching time is long, easy frame losing.Present invention achieves
Double ONU equipment on single pcb board, community network data buffer storage simultaneously, switching time is fast, not frame losing.
And only using 1 exchange interface, system cost is low.4th, prior art needs webmaster, OLT
Configure 2 ONU equipment, the present invention only needs to configure primary ONU equipment, main ONU equipment meeting simultaneously
Configuration information is synchronized to standby ONU equipment, reduces the management complexity of webmaster and OLT.
Other features and advantages of the present invention will illustrate in the following description, and, partly from
Become apparent in description, or understood by implementing the present invention.The purpose of the present invention and its
His advantage can be by specifically noted knot in the description write, claims and accompanying drawing
Structure is realizing and to obtain.
Below by drawings and Examples, technical scheme is described in further detail.
Brief description
Accompanying drawing is used for providing a further understanding of the present invention, and constitutes a part for description, with
Embodiments of the invention are used for explaining the present invention together, are not construed as limiting the invention.In accompanying drawing
In：
Fig. 1 is the connection diagram of ONU of the prior art and OLT；
Fig. 2 is the structural principle of the electric power acquisition device of double PON double MAC protection of the embodiment of the present invention
Figure；
Fig. 3 is the inquiry of the embodiment of the present invention and the schematic diagram of configuration standby usage PON mouth；
Fig. 4 is the topology schematic diagram of optical network protection hand in hand of the embodiment of the present invention；
Fig. 5 is the configuration of ONU standby usage PON mouth of the embodiment of the present invention and synchronous schematic diagram；
Fig. 6 is the schematic diagram that optical fiber link fault is monitored of the embodiment of the present invention.
Specific embodiment
Below in conjunction with the accompanying drawings, the specific embodiment of the present invention is described in detail, it is to be understood that this
The protection domain of invention is not limited by specific embodiment.
Extremely it is easily caused electric power acquisition communication system failure in order to solve optical fiber link in prior art
Technical problem, the present invention proposes electric power acquisition device and its work of a kind of couple of PON double MAC protection
Method.The electric power acquisition device of this pair PON pair MAC protection is actually optical network unit ONU
(Optica l Network Uni t), is arranged in electric power acquisition terminal.
As shown in Fig. 2 the electric power acquisition device of double PON of the present invention double MAC protection, including：The
One optical module (optical module 1), the second optical module (optical module 2), a PON-MAC chip, the 2nd PON-MAC
Chip, selector circuit；Described first optical module passes through fiber optic network and outside first optical line terminal OLT 1
It is connected, described second optical module is connected with outside second optical line terminal OLT 2 by fiber optic network；Described
First optical module is connected with described selector circuit also by a described PON-MAC chip, and described second
Optical module is connected with described selector circuit also by described 2nd PON-MAC chip；Described first
PON-MAC chip is also connected with described 2nd PON-MAC chip；Described selector circuit is handed over also by outside
Change planes connection power equipment.PON refers to Pass ive Opt ical Network, EPON, MAC
Refer to Media Access Control, medium education；PON-MAC chip is a kind of based on passive
The MAC chip of the media access control protocol of optical-fiber network.
When the optical link protection form of fiber optic network is to protect form hand in hand, described OLT1, OLT2 are
Different OLT；When the optical link protection form of fiber optic network is Type D protection form, described OLT1,
OLT2 is same OLT.
Preferably, the selector circuit of the present invention is complex programmable logic device (CPLD) (Complex
Programmable Logic Device), it will be understood by those skilled in the art that other are capable of leading
The selector circuit of the functions such as standby PON mouth selection should also be as being included in the scope of protection of present invention.
Preferably, the PON-MAC chip in the present invention adopts SGC3001 chip.This SGC3001 chip,
Including SGC3001 (1), SGC3001 (2), comprise multiple serial ports or interface thereon, such as：Universal asynchronous
Receiving-transmitting transmitter serial ports UART (Universal Asynchronous Receiver/Transmitter),
Input/output interface I/O (i.e. int interface in Fig. 2), temporal information interface TOD (Time Of Date),
Gigabit GMII GMII (Gigabit Medium Independent Interface), management number
According to input/output interface MDIO (Management Data Input/Output) etc..2 pieces of SGC3001
Chip is passed through above-mentioned various serial ports, interface or network interface respectively and is connected with CPLD.
Also multiple interfaces or serial ports is comprised, such as MDIO, gigabit ethernet interface GE (Gigabit on CPLD
Ethernet), CPLD is connected with external switch by MDIO, GE, thus by external switch even
Connect multiple stage power equipment.
The workflow of the electric power acquisition device of double PON of the present invention double MAC protection comprises the following steps：
Step 1, device power initialization：After the upper electricity of ONU, whole system can execute an integral reset.
After reset, 2 PON-MAC chips determine to lead according to the PON_IF_ID signal that CPLD sends over
Resting state, i.e. primary PON mouth and standby PON mouth.For example can arrange as PON_IF_ID=0,
Then this PON_IF_ID corresponding PON-MAC chip is in master state, and corresponding PON mouth is primary
PON mouth；As PON_IF_ID=1, corresponding PON mouth is standby PON mouth.Wherein, PON mouth bag
Include：PON-MAC chip and the corresponding optical module being connected.
Step 2, facility registration and discovery：MPCP registration follows IEEE 802.3ah agreement with discovery；
IEEE 802.3ah agreement and CTC3.0 company standard are followed in OAM discovery procedure.MPCP
(Multi-Point Control Protocol, Multi-point Control Protocol) is that EPON MAC controls sublayer
Agreement.MPCP defines the control mechanism between OLT and ONU, carrys out effective transmission of coordination data
And reception.OAM, Operation Administration and Maintenance.According to operation
The management work of network is generally divided into 3 big class by being actually needed of business's network operation：Operation
(Operation), manage (Administration), safeguard (Maintenance), referred to as
OAM.Operation mainly completes prediction, planning and the configuration work that commodity network and business are carried out；
Safeguard the regular job activity that the test mainly to network and its business and fault management etc. are carried out.
Step 3, the inquiry of equipment standby usage PON mouth and setting：Facility registration in step 2 and
After the completion of discovery, now due to having determined primary PON and standby PON in step 1, connect master
Acquisition can be inquired about with the OLT of PON mouth by sending OAM frame to electric power acquisition device (ONU)
The state of 2 PON-MAC chips and information in ONU.And, the side that OLT can be arranged by OAM
Formula goes to change the primary PON mouth of ONU equipment, and the transmission channel now adopting is alternate channel.
Inquiry and configuration process are as shown in Figure 3.Query script：OLT sends Active PON_IF to ONU
Reques t (get) instructs, the state of 2 pieces of PON-MAC chips and information in acquisition request ONU,
ONU replys Act ive PON_IF Response instruction to OLT, carries 2 pieces of PON-MAC in this instruction
The state of chip and information (including luminous power, log-on message of SGC3001 chip of optical module etc.).
Configuration process：OLT sends Active PON_IF Request (set) instruction to ONU, and request is right
Primary PON mouth and standby PON mouth switch over, and ONU replys Active PON_IF Response to OLT
Instruction, and carry out the switching of standby usage PON, switching completes.
After the completion of inquiry and configuration process, taking the EPON optical-fiber network of protection type hand in hand as a example, its guarantor
Shield topology information is as shown in Figure 4.
After ONU1 standby usage PON mouth switches, the service protection link as table 1 at webmaster, can be formed
Information：
Table 1
After completing the switching of standby usage PON mouth, primary PON mouth is all passed through in all of service attribute configuration
Complete, completed the business consistency synchronization of standby usage PON mouth by ONU equipment.Configuration and synchronizing process
As shown in figure 5, from OLT pass through primary PON mouth to ONU send Vlan Set instruction etc. (Vlan,
Virtual Local Area Network, VLAN), ONU configuration completes backward OLT and returns
Multiple Vlan Set OK instruction, confirms configuration successful, and related service attribute configuration information is synchronous
To standby PON mouth.
Step 4, optical fiber link failover：OLT and ONU can monitor the state of optical link.When send out
When existing optical signal loss or Signal Degrade, start optical path switching.Assume that work during initialization is opened up
Flutter figure as shown in fig. 6, the primary PON mouth of in figure ONU1 and ONU2 is connected on No. 0 PON of OLT-ID7
On mouth；In Fig. 6, PON ID is to discriminate between the coding of different PON mouths on OLT, and PON IF ID is area
Divide the primary PON mouth of ONU and the coding of standby PON mouth.
In topological structure as shown in Figure 6, employ 2 ONU, i.e. ONU1, ONU2, wherein,
The primary PON mouth of ONU1, ONU2 is all connected on No. 0 PON of OLT ID=7, ONU1, ONU2
Standby PON mouth be all connected on No. 1 PON of OLT ID=8.
(1) at position 1 in Fig. 6, that is, trunk optical fiber (optical fiber between OLT to beam splitter) goes out
During existing link failure：1. if OLT-ID7 monitors that backbone optical path is abnormal, thus report on webmaster
Alert event, the optical module simultaneously closing off No. 0 PON mouth (includes the light of the upper primary PON of ONU1, ONU2
Module) sending function；2. when ONU1 and ONU2 monitors that light path is abnormal, they are respective standby
Switch to primary PON mouth with PON mouth, and report optical link handover event.
(2) at Fig. 6 position 2, i.e. chain in light splitting fibre (optical fiber between ONU to beam splitter)
During the fault of road：If 1. OLT-ID7 monitors that ONU1 light path is abnormal, webmaster report and alarm thing can be given
Part；2. when ONU1 monitors that light path is abnormal, it can switch to primary PON the standby PON mouth of oneself
Mouthful, and report optical link handover event.
The electric power acquisition device (ONU) of double PON of the present invention double MAC protection and its method of work, with
Existing technology is compared, and has following technique effect：1st, by using low-power consumption PON-MAC chip,
Have the advantages that equipment power dissipation is low.2nd, using the ONU chip with hardware TOD interface and CPLD,
The clock jitter degree of accuracy that single fiber link failure causes can be realized, solving prior art cannot expire
The synchronous problem of sufficient power system precision clock.3rd, prior art is entered using 2 single ONU equipment
Row link protection hand in hand, when single fiber breaks down, switching time is long, easy frame losing.The present invention
Achieve the double ONU equipment on single pcb board, community network data buffer storage simultaneously, switching time is fast,
Not frame losing.And only using 1 exchange interface, system cost is low.4th, prior art needs
Webmaster, OLT configure 2 ONU equipment simultaneously, and the present invention only needs to configure primary ONU equipment, main
Configuration information can be synchronized to standby ONU equipment by ONU equipment, reduce webmaster and the management of OLT is multiple
Miscellaneous degree.
The present invention can have the specific embodiment of multiple multi-forms, combine above taking Fig. 2-Fig. 6 as a example
Accompanying drawing explanation for example to technical scheme, it is concrete that this is not meant to that the present invention is applied
Example can only be confined in specific flow process or example structure, and those of ordinary skill in the art should
Understand, specific embodiments presented above are some examples in multiple its preferred usage, any
The embodiment embodying the claims in the present invention all should be in technical solution of the present invention scope required for protection
Within.
Finally it should be noted that：The foregoing is only the preferred embodiments of the present invention, be not used to
Limit the present invention, although being described in detail to the present invention with reference to the foregoing embodiments, for ability
For the technical staff in domain, it still can be repaiied to the technical scheme described in foregoing embodiments
Change, or equivalent is carried out to wherein some technical characteristics.All the spirit and principles in the present invention it
Interior, any modification, equivalent substitution and improvement made etc., should be included in protection scope of the present invention
Within.
Claims (13)
1. the electric power acquisition device of a kind of pair PON pair MAC protection is it is characterised in that include：
First optical module, the second optical module, a PON-MAC chip, the 2nd PON-MAC chip, choosing
Select device circuit；
Described first optical module is connected with outside first optical line terminal OLT 1 by fiber optic network, and described
Two optical modules are connected with outside second optical line terminal OLT 2 by fiber optic network；
Described first optical module is connected with described selector circuit also by a described PON-MAC chip,
Described second optical module is connected with described selector circuit also by described 2nd PON-MAC chip；
A described PON-MAC chip is also connected with described 2nd PON-MAC chip；Described selector electricity
Road connects power equipment also by external switch.
2. the electric power acquisition device of according to claim 1 pair PON pair MAC protection, its feature exists
In when the optical link protection form of fiber optic network is to protect form hand in hand, described OLT1, OLT2 are
Different OLT；
When the optical link protection form of fiber optic network is Type D protection form, described OLT1, OLT2
It is same OLT.
3. the electric power acquisition device of according to claim 1 pair PON pair MAC protection, its feature exists
In described PON-MAC chip is SGC3001 chip.
4. the electric power acquisition device of according to claim 1 pair PON pair MAC protection, its feature exists
In described selector circuit is complex programmable logic device (CPLD).
5. the electric power acquisition device of the double MAC of the double PON according to claim 1-4 any one protection,
It is characterized in that, described PON-MAC chip includes：Universal asynchronous receiving-transmitting transmitter serial ports UART, described
First PON-MAC chip is connected with described PON-MAC chip by UART；
A described PON-MAC chip, described 2nd PON-MAC chip pass through UART and described choosing respectively
Select device circuit to be connected.
6. the electric power acquisition device of the double MAC of the double PON according to claim 1-4 any one protection,
It is characterized in that, described PON-MAC chip also includes：Input/output interface I/O, a described PON-MAC
Chip, described 2nd PON-MAC chip are connected with described selector circuit by described I/O respectively.
7. the electric power acquisition device of the double MAC of the double PON according to claim 1-4 any one protection,
It is characterized in that, described PON-MAC chip also includes：Temporal information interface TOD, a described PON-MAC
Chip, described 2nd PON-MAC chip are connected with described selector circuit by described TOD respectively.
8. the electric power acquisition device of the double MAC of the double PON according to claim 1-4 any one protection,
It is characterized in that, described PON-MAC chip also includes：Gigabit GMII GMII, described first
PON-MAC chip, described 2nd PON-MAC chip are respectively by described GMII and described selector circuit
It is connected.
9. the electric power acquisition device of the double MAC of the double PON according to claim 1-4 any one protection,
It is characterized in that, described PON-MAC chip also includes：Management data input/output interface MDIO, described
First PON-MAC chip, described 2nd PON-MAC chip pass through described MDIO and described selector respectively
Circuit is connected.
10. the electric power acquisition dress of the double MAC of the double PON according to claim 1-4 any one protection
Put it is characterised in that described selector circuit includes：Management data input/output interface MDIO, gigabit
Ethernet interface GE, described selector circuit is connected with external switch respectively by described MDIO, GE.
The electric power acquisition of the double MAC protection of the double PON as described in a kind of 11. any one as claim 1-10
The method of work of device is it is characterised in that include：
First PON-MAC chip, the 2nd PON-MAC chip are according to the PON mouth receiving from selector circuit
Selection signal PON_IF_ID determines primary PON mouth and standby PON mouth, and described PON mouth includes PON-MAC
Chip and connected optical module；
The OLT connecting described primary PON mouth sends OAM frame to electric power acquisition device, to obtain described electricity
A PON-MAC chip, the state of the 2nd PON-MAC chip and information that force acquisition device returns；
Connect the OLT of described primary PON mouth and described electric power acquisition device monitor optical link state respectively,
When optical link breaks down, start optical path switching.
The electric power acquisition device of 12. according to claim 11 pairs PON pair MAC protection, its feature
It is, described OLT and described electric power acquisition device monitor optical link state respectively, when optical link occurs event
During barrier, start optical path switching and include：
When the OLT connecting described primary PON mouth monitors trunk optical fiber link failure, then close and be somebody's turn to do
The sending function of the optical module that the PON mouth of OLT is connected, described trunk optical fiber link be OLT to beam splitter it
Between optical fiber link；
When described electric power acquisition device monitoring is to trunk optical fiber link failure, then by itself standby PON mouth
Switch to primary PON mouth.
The electric power acquisition device of 13. according to claim 12 pairs PON pair MAC protection, its feature
It is, described OLT and described electric power acquisition device monitor optical link state respectively, when optical link occurs event
During barrier, start optical path switching and also include：
When the described OLT connecting described primary PON mouth monitors the light splitting fibre chain of described electric power acquisition device
When road is abnormal, then report and alarm event, described point of optical fiber link is the optical fiber chain to beam splitter for the ONU
Road；
When described electric power acquisition device monitoring to point optical fiber link abnormal when, then itself standby PON mouth is cut
It is changed to primary PON mouth.
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| CN107359932A (en) * | 2017-08-03 | 2017-11-17 | 国家电网公司 | Double fiber links protect ONU systems |
| CN108197682A (en) * | 2018-01-12 | 2018-06-22 | 烽火通信科技股份有限公司 | The sub- frame data processing method and processing system of a kind of no electronic tag |
| CN108616305A (en) * | 2018-05-08 | 2018-10-02 | 国网天津市电力公司 | A kind of power distribution automation communication equipment integration fault location system |
| 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 |
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