CN102014000A - E1/T1 branch protection method and device - Google Patents
E1/T1 branch protection method and device Download PDFInfo
- Publication number
- CN102014000A CN102014000A CN2010105726064A CN201010572606A CN102014000A CN 102014000 A CN102014000 A CN 102014000A CN 2010105726064 A CN2010105726064 A CN 2010105726064A CN 201010572606 A CN201010572606 A CN 201010572606A CN 102014000 A CN102014000 A CN 102014000A
- Authority
- CN
- China
- Prior art keywords
- branch road
- branch
- protection device
- switching command
- standby
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Abstract
The invention discloses an E1/T1 branch protection method and device. The method comprises: judging whether a primary E1/T1 branch is interrupted or warned; if yes, sending a switching instruction to the E1/T1 branch protection device; and switching a standby E1/T1 branch to a user branch by the E1/T1 branch protection device so as to replace the primary E1/T1 branch. By means of the invention, the problem in the prior art that the E1/T1 branch can not be protected is solved.
Description
Technical field
The present invention relates to the communications field, in particular to a kind of E1/T1 branch protection method and apparatus.
Background technology
Along with the high speed development of communication network, network becomes necessary tool in people's routine work and the life gradually, and communication interruption tends to cause the unstability than large economy loss and society.Thereby need carry out necessary protection to relevant facility such as the network equipment, communication line.
Yet, for the E1/T1 branch protection, effective solution is not proposed as yet at present.
Summary of the invention
The present invention aims to provide a kind of E1/T1 branch protection method and apparatus, to solve in the prior art problem that can't protect the E1/T1 branch road.
According to an aspect of the present invention, provide a kind of E1/T1 branch protection method, it comprises: judge whether the master occurs interrupting or alarm with the E1/T1 branch road; If then send switching command to E1/T1 branch protection device; Above-mentioned E1/T1 branch protection device switches to user's branch road with standby E1/T1 branch road, to replace the above-mentioned main E1/T1 branch road of using.
Further, judge main do not occur with the E1/T1 branch road interrupting or alarm after, also comprise: above-mentioned E1/T1 branch protection device reception query statement; The internal state parameter that above-mentioned E1/T1 branch protection device reports above-mentioned query statement to inquire about.
Further, judge main do not occur with the E1/T1 branch road interrupting or alarm after, also comprise: above-mentioned E1/T1 branch protection device receives the pressure switching command; Above-mentioned E1/T1 branch protection device switches to above-mentioned user's branch road according to above-mentioned pressure switching command with above-mentioned standby E1/T1 branch road, to replace the above-mentioned main E1/T1 branch road of using.
Further, send above-mentioned switching command by RS-485 distributed bus control channel to above-mentioned E1/T1 branch protection device.
Further, E1/T1 branch protection device comprises the step that standby E1/T1 branch road switches to user's branch road: whether the content of the switching command that E1/T1 branch protection device relatively receives is consistent with local current switching state; If inconsistent, then standby E1/T1 branch road is switched to user's branch road according to above-mentioned switching command.
Further, the content that compares the switching command that receives as if above-mentioned E1/T1 branch protection device is consistent with local current switching state, does not then carry out the step that standby E1/T1 branch road is switched to user's branch road.
According to a further aspect in the invention, provide a kind of E1/T1 branch protection device, it comprises: the branch road switch controller is used for the switching command that the E1/T1 branch road occurs interrupting or receive during alarm with the E1/T1 branch road main; The active/standby branch road switch of using is used for according to above-mentioned switching command standby E1/T1 branch road being switched to user's branch road, to replace the main E1/T1 branch road of using.
Further, above-mentioned branch road switch controller also is used for not receiving query statement when the master occurs interrupting with the E1/T1 branch road or alarms, and the internal state parameter that reports above-mentioned query statement to inquire about.
Further, above-mentioned branch road switch controller also is used for not occurring interrupting or the pressure switching command of reception E1/T1 branch road when alarming with the E1/T1 branch road main; Above-mentionedly active/standbyly also be used for above-mentioned standby E1/T1 branch road being switched to above-mentioned user's branch road, to replace the above-mentioned main E1/T1 branch road of using according to above-mentioned pressure switching command with the branch road switch.
Further, E1/T1 branch protection device also comprises: RS-485 distributed bus interface circuit, the RS-485 level signal that is used for sending convert the control signal that issues that above-mentioned branch road switch controller can discern to, and send to above-mentioned branch road switch controller; With above-mentioned branch road switch controller send on send control signal to convert the RS-485 level signal to.
In the present invention, replace with standby E1/T1 branch road with the main of interruption or alarm occurring with the E1/T1 branch road, standby E1/T1 branch road switches to user's branch road, thereby realizes the protection of E1/T1 branch road, guarantees that the user's communications business is unaffected.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, do not constitute improper qualification of the present invention.In the accompanying drawings:
Fig. 1 is a kind of preferred flow chart according to the E1/T1 branch protection method of the embodiment of the invention;
Fig. 2 is a kind of preferred construction figure according to the E1/T1 branch protection device of the embodiment of the invention;
Fig. 3 is the another kind of preferred construction figure according to the E1/T1 branch protection device of the embodiment of the invention;
Fig. 4 is the another kind of preferred flow chart according to the E1/T1 branch protection method of the embodiment of the invention.
Embodiment
Below with reference to the accompanying drawings and in conjunction with the embodiments, describe the present invention in detail.
Hereinafter will describe the present invention with reference to the accompanying drawings and in conjunction with the embodiments in detail.Need to prove that under the situation of not conflicting, embodiment and the feature among the embodiment among the application can make up mutually.
Embodiment 1
Fig. 1 is that it comprises the steps: according to a kind of preferred flow chart of the E1/T1 branch protection method of the embodiment of the invention
S102 judges whether the master occurs interrupting or alarm with the E1/T1 branch road;
S104 is if then send switching command to E1/T1 branch protection device;
S106, described E1/T1 branch protection device switches to user's branch road with standby E1/T1 branch road, to replace the described main E1/T1 branch road of using.
In this preferred embodiment, replace with standby E1/T1 branch road by the main of interruption or alarm occurring with the E1/T1 branch road, standby E1/T1 branch road switches to user's branch road, has realized the protection of E1/T1 branch road, guarantees that the user's communications business is unaffected.
Preferably, judge main do not occur with the E1/T1 branch road interrupting or alarm after, described E1/T1 branch protection device reception query statement; The internal state parameter that described E1/T1 branch protection device reports described query statement to inquire about.In this preferred embodiment,, realized state-detection to E1/T1 branch protection device by reporting the internal state parameter.
Preferably, judge main do not occur with the E1/T1 branch road interrupting or alarm after, described E1/T1 branch protection device receives the pressure switching command; Described E1/T1 branch protection device switches to described user's branch road according to described pressure switching command with described standby E1/T1 branch road, to replace the described main E1/T1 branch road of using.In this preferred embodiment,, user's operation, operation and maintenance have been made things convenient for by forcing switching command.
Preferably, send described switching command by RS-485 distributed bus control channel to described E1/T1 branch protection device.In the preferred embodiment of the invention; when breaking down for one in the N of usefulness bar E1/T1 branch road; the control command that the M bar E1/T1 branch road of backup can issue according to the RS-485 bus; automatically switch on user's branch road; realize the M:N branch protection; the communication support service is provided, realizes the professional normal E1/T1 branch protection apparatus and method that transmit of important communication.
Preferably, described E1/T1 branch protection device comprises the step that standby E1/T1 branch road switches to user's branch road: whether the content of the switching command that described E1/T1 branch protection device relatively receives is consistent with local current switching state; If inconsistent, then standby E1/T1 branch road is switched to user's branch road according to described switching command.In this preferred embodiment, content and local current switching state by the switching command that relatively receives make and only just carry out switching in inconsistent situation, thereby saved overhead.
Preferably, the content that compares the switching command that receives as if described E1/T1 branch protection device is consistent with local current switching state, does not then carry out the step that standby E1/T1 branch road is switched to user's branch road.In this preferred embodiment, content and local current switching state by the switching command that relatively receives make and only just carry out switching in inconsistent situation, thereby saved overhead.
Fig. 2 is that it comprises according to a kind of preferred construction figure of the E1/T1 branch protection device of the embodiment of the invention: branch road switch controller 202 is used for the switching command that the E1/T1 branch road occurs interrupting or receive during alarm with the E1/T1 branch road main; The active/standby branch road switch 204 of using is used for according to described switching command standby E1/T1 branch road being switched to user's branch road, to replace the main E1/T1 branch road of using.
In this preferred embodiment, replace with standby E1/T1 branch road by the main of interruption or alarm occurring with the E1/T1 branch road, standby E1/T1 branch road switches to user's branch road, has realized the protection of E1/T1 branch road, guarantees that the user's communications business is unaffected.
Preferably, described branch road switch controller 202 also is used for not receiving query statement when the master occurs interrupting with the E1/T1 branch road or alarms, and the internal state parameter that reports described query statement to inquire about.In this preferred embodiment,, realized state-detection to E1/T1 branch protection device by reporting the internal state parameter.
Preferably, described branch road switch controller 202 also is used for receiving the pressure switching command of E1/T1 branch road when interruption or alarm appear in the main E1/T1 of using branch road; Describedly active/standbyly also be used for described standby E1/T1 branch road being switched to described user's branch road, to replace the described main E1/T1 branch road of using according to described pressure switching command with branch road switch 204.In this preferred embodiment,, user's operation, operation and maintenance have been made things convenient for by forcing switching command.
Preferably, E1/T1 branch protection device according to the embodiment of the invention also comprises: RS-485 distributed bus interface circuit 206, the RS-485 level signal that is used for sending converts the control signal that issues that described branch road switch controller 202 can discern to, and sends to described branch road switch controller 202; With described branch road switch controller 202 send on send control signal to convert the RS-485 level signal to.In the preferred embodiment of the invention; when breaking down for some in the N of usefulness bar E1/T1 branch road; some the control commands that can issue according to the RS-485 bus in the M bar E1/T1 branch road of backup; automatically switch on user's branch road; realize the M:N branch protection; the communication support service is provided, realizes the professional normal E1/T1 branch protection apparatus and method that transmit of important communication.
Preferably, active/standbyly with branch road switch 204 step that standby E1/T1 branch road switches to user's branch road is comprised: whether the content of the active/standby switching command that relatively receives with branch road switch 204 is consistent with local current switching state; If inconsistent, then standby E1/T1 branch road is switched to user's branch road according to described switching command.In this preferred embodiment, content and local current switching state by the switching command that relatively receives make and only just carry out switching in inconsistent situation, thereby saved overhead.
Preferably, if the current switching state in the active/standby content that compares the switching command that receives with branch road switch 204 and this locality is consistent, then do not carry out the step that standby E1/T1 branch road is switched to user's branch road.In this preferred embodiment, content and local current switching state by the switching command that relatively receives make and only just carry out switching in inconsistent situation, thereby saved overhead.
Embodiment 2
The present invention also provides a kind of E1/T1 branch protection device, and as shown in Figure 3, it mainly comprises following several sections: power-switching circuit, RS-485 distributed bus interface circuit, branch road switch controller, the active/standby branch road switch of using.
The major function of power-switching circuit: convert external power source to power supply that other functional modules need.
The major function of RS-485 distributed bus interface circuit: the RS-485 level signal that will send to the branch protection device converts the control signal that issues that the branch road switch controller can discern to, and sends to the branch road switch controller; With the branch road switch controller send on send control signal to convert the RS-485 signal to; In the scope of 0-1000 rice, can keep the normal of RS-485 communication;
The major function of branch road switch controller: when operate as normal, receive status inquiry command, send by the parameters such as internal state of RS-485 distributed bus interface circuit with E1/T1 branch protection device; When receiving switching command, convert switching command to control signal, send to the active/standby branch road switch of using;
Active/standby is switch-over control signal according to branch road switch controller output with branch road switch major function, selection will lead with or emergency bypass switch to user's branch road.
Compared with prior art, following advantage is arranged:
1) scheme is simple, and few, the good economy performance of cost is easy to realize and promote;
2) can provide the port and the route protection of branch road simultaneously;
3) control channel adopts distributed bus, and flexibility is good, and command range is long;
4) can provide the E1/T1 branch protection of M:N simultaneously;
5) can provide more reliable communication support service for important professional E1/T1 branch road;
6) the protection process of E1/T1 branch protection can be finished automatically, has reduced the influence to the user;
7) handoff procedure of E1/T1 branch road also supports artificial command forces to switch, and has made things convenient for the scheduling and the protection of E1/T1 branch road;
The course of work of 4 pairs of above-mentioned E1/T1 branch protection devices describes in conjunction with the accompanying drawings:
At first, E1/T1 branch protection device powers on, and as Fig. 3 and 4, it is the power supply that device needs that power-switching circuit will be imported power source conversion, gives each functional module power supply; The initialization of branch road switch controller, and acquiescence will be led with branch road and switch to user's branch road.
During operate as normal, E1/T1 branch protection device is in waits for the reception coomand mode, according to the difference of the content of instructing, carries out different operations.
When E1/T1 branch protection device receives when issuing query statement by the RS-485 bus, the branch road switch controller in the device of E1/T1 branch protection can will be kept at wherein internal state parameter by sending the response querying command on the RS-485 bus.
When E1/T1 branch protection device is received the switching command that issues by the RS-485 bus; according to the switching command content; the branch road switch controller sends switch-over control signal to the active/standby branch road switch of using; emergency bypass is switched to user's branch road; thereby replace the corresponding main branch road of using, realize the protection of E1/T1 branch road.
The flow process of E1/T1 branch protection is described as follows referring to Fig. 4:
S1: power on, it is the power supply that device needs that power-switching circuit will be imported power source conversion, gives each functional module power supply.
S2: the initialization of branch road switch controller, branch road switch controller acquiescence will be led with branch road and switch to user's branch road.
S3: the branch road switch controller enters waits for the reception command status.
S4: the branch road switch controller receives down and sends instructions.
S5: the analysis of branch road switch controller, judge whether receive following sends instructions is switching command.
S6:, then send on the state parameter of branch road switch controller with the E1/T1 branch protection, and forward S3 to if not switching command; If switching command, relatively whether the switch contents of switching command is consistent with existing switching state, if consistent, the branch road switch controller is switching state not, forwards to change S3 over to; If whether the switch contents of switching command is inconsistent with existing switching state, enter S7.
S7: according to the switching command content, the branch road switch controller sends switch-over control signal to the active/standby branch road switch of using.
S8: the active/standby switching of finishing primary, spare branch road with the branch road switch according to switch-over control signal.After switching is finished, changed for the 3rd step over to, the branch road switch controller enters waits for the reception command status.
Be controlled in 50 milliseconds the switching time of branch protection.Be about about 1.0 kilometers the transmission characteristic of this and chip for driving and cable, network environment and institute's difference for the longest distance that can protect.
As can be seen from the above description, the present invention has realized following technique effect:
When certain bar master interruption or alarm occur with the E1/T1 branch road, corresponding master can detect alarm with the branch road communication port, issue control command for E1/T1 branch protection device by RS-485 distributed bus control channel this moment, replace with standby E1/T1 branch road with the main of interruption or alarm occurring with the E1/T1 branch road, standby E1/T1 branch road switches to user's branch road, thereby realize the protection of E1/T1 branch road, guarantee that the user's communications business is unaffected; Also can under the situation that does not have alarm, give E1/T1 branch protection device as required, force to switch primary, spare E1/T1 branch road, with user friendly operation, operation and maintenance by issuing control command; When needs are inquired about the state parameter of E1/T1 branch protection device, can issue query statement by the RS-485 distributed bus, after E1/T1 branch protection device is received query statement, send on the state parameter with protective device.
In some important use occasions, can adopt the mode of active and standby part of protection of E1/T1 branch road, realize more high-grade communication service.
For different communication users, can be divided into different grades according to importance, when communication goes wrong, preferentially ensure the user that grade is important; User for particular importance, may be thought of as it and reserve standby E1/T1 branch road, in case occur interrupting or other traffic affecting alarms at the E1/T1 of usefulness branch road, can immediately standby E1/T1 branch road be switched on user's branch road, thereby guarantee the unimpeded of its communication; Just can not protect for the user unessential, that user gradation is not high.
Obviously, those skilled in the art should be understood that, above-mentioned each module of the present invention or each step can realize with the general calculation device, they can concentrate on the single calculation element, perhaps be distributed on the network that a plurality of calculation element forms, alternatively, they can be realized with the executable program code of calculation element, carry out by calculation element thereby they can be stored in the storage device, perhaps they are made into each integrated circuit modules respectively, perhaps a plurality of modules in them or step are made into the single integrated circuit module and realize.Like this, the present invention is not restricted to any specific hardware and software combination.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. an E1/T1 branch protection method is characterized in that, comprising:
Judge whether the master occurs interrupting or alarm with the E1/T1 branch road;
If then send switching command to E1/T1 branch protection device;
Described E1/T1 branch protection device switches to user's branch road with standby E1/T1 branch road, to replace the described main E1/T1 branch road of using.
2. method according to claim 1 is characterized in that, judge main do not occur with the E1/T1 branch road interrupting or alarm after, also comprise:
Described E1/T1 branch protection device receives query statement;
The internal state parameter that described E1/T1 branch protection device reports described query statement to inquire about.
3. method according to claim 1 is characterized in that, judge main do not occur with the E1/T1 branch road interrupting or alarm after, also comprise:
Described E1/T1 branch protection device receives forces switching command;
Described E1/T1 branch protection device switches to described user's branch road according to described pressure switching command with described standby E1/T1 branch road, to replace the described main E1/T1 branch road of using.
4. method according to claim 1 is characterized in that, sends described switching command by RS-485 distributed bus control channel to described E1/T1 line protection device.
5. method according to claim 1 is characterized in that, described E1/T1 branch protection device comprises the step that standby E1/T1 branch road switches to user's branch road:
Whether the content of the switching command that described E1/T1 branch protection device relatively receives is consistent with local current switching state;
If inconsistent, then standby E1/T1 branch road is switched to user's branch road according to described switching command.
6. method according to claim 5 is characterized in that, the content that compares the switching command that receives as if described E1/T1 branch protection device is consistent with local current switching state, does not then carry out the step that standby E1/T1 branch road is switched to user's branch road.
7. an E1/T1 branch protection device is characterized in that, comprising:
The branch road switch controller is used for the switching command that the E1/T1 branch road occurs interrupting or receive during alarm with the E1/T1 branch road main;
The active/standby branch road switch of using is used for according to described switching command standby E1/T1 branch road being switched to user's branch road, to replace the main E1/T1 branch road of using.
8. device according to claim 7 is characterized in that, described branch road switch controller also is used for not receiving query statement when the master occurs interrupting with the E1/T1 branch road or alarms, and the internal state parameter that reports described query statement to inquire about.
9. device according to claim 7 is characterized in that, described branch road switch controller also is used for not occurring interrupting or the pressure switching command of reception E1/T1 branch road when alarming with the E1/T1 branch road main; Describedly active/standbyly also be used for described standby E1/T1 branch road being switched to described user's branch road, to replace the described main E1/T1 branch road of using according to described pressure switching command with the branch road switch.
10. according to each described device in the claim 7 to 9, it is characterized in that, also comprise:
RS-485 distributed bus interface circuit, the RS-485 level signal that is used for sending convert the control signal that issues that described branch road switch controller can discern to, and send to described branch road switch controller; With described branch road switch controller send on send control signal to convert the RS-485 level signal to.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105726064A CN102014000A (en) | 2010-12-03 | 2010-12-03 | E1/T1 branch protection method and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105726064A CN102014000A (en) | 2010-12-03 | 2010-12-03 | E1/T1 branch protection method and device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102014000A true CN102014000A (en) | 2011-04-13 |
Family
ID=43844028
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010105726064A Pending CN102014000A (en) | 2010-12-03 | 2010-12-03 | E1/T1 branch protection method and device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102014000A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102098198A (en) * | 2010-12-31 | 2011-06-15 | 北京华环电子股份有限公司 | Ethernet protection method and device |
| CN107623582A (en) * | 2016-07-13 | 2018-01-23 | 广州市银讯通信科技有限公司 | A kind of E1 passage not damaged automatic switching control equipments of multichannel Large Copacity |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5506956A (en) * | 1993-04-07 | 1996-04-09 | Sprint Communications Company L.P. | Error correction and channel restoration apparatus for T1 digital links |
| CN1612495A (en) * | 2003-10-28 | 2005-05-04 | 港湾网络有限公司 | Main-standby conversion control method for communication device |
| CN101291160A (en) * | 2008-05-30 | 2008-10-22 | 京信通信系统（中国）有限公司 | Backup system for microwave optical fiber link and backup method thereof |
| CN101350961A (en) * | 2008-08-29 | 2009-01-21 | 广东倍增通信设备有限公司 | Equipment for switching digital circuit and protective system |
-
2010
- 2010-12-03 CN CN2010105726064A patent/CN102014000A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5506956A (en) * | 1993-04-07 | 1996-04-09 | Sprint Communications Company L.P. | Error correction and channel restoration apparatus for T1 digital links |
| CN1612495A (en) * | 2003-10-28 | 2005-05-04 | 港湾网络有限公司 | Main-standby conversion control method for communication device |
| CN101291160A (en) * | 2008-05-30 | 2008-10-22 | 京信通信系统（中国）有限公司 | Backup system for microwave optical fiber link and backup method thereof |
| CN101350961A (en) * | 2008-08-29 | 2009-01-21 | 广东倍增通信设备有限公司 | Equipment for switching digital circuit and protective system |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102098198A (en) * | 2010-12-31 | 2011-06-15 | 北京华环电子股份有限公司 | Ethernet protection method and device |
| CN102098198B (en) * | 2010-12-31 | 2013-07-31 | 北京华环电子股份有限公司 | Ethernet protection method and device |
| CN107623582A (en) * | 2016-07-13 | 2018-01-23 | 广州市银讯通信科技有限公司 | A kind of E1 passage not damaged automatic switching control equipments of multichannel Large Copacity |
| CN107623582B (en) * | 2016-07-13 | 2021-01-05 | 广州市银讯通信科技有限公司 | Multichannel large-capacity E1 channel non-damage automatic switching device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104753585A (en) | Intelligent optical fiber distribution device | |
| JP2009508373A (en) | Optical fiber access network and communication protection method thereof | |
| CN105323080B (en) | A kind of link backup, power supply backup method, apparatus and system | |
| CN204615827U (en) | A kind of Intelligent optical fiber distributor and system | |
| CN109526005A (en) | A kind of Radio Network System and communication means | |
| CN103795458A (en) | Optical fiber switching protection system and control method thereof | |
| CN203645671U (en) | Fiber switching protection system | |
| CN102014000A (en) | E1/T1 branch protection method and device | |
| JP3997205B2 (en) | Transfer block system for distributed power supply | |
| CN209930259U (en) | Intelligent optical cable monitoring system with optical cable protection function | |
| CN204791496U (en) | Intelligent remote control system and intelligent telecontrolled model of battery | |
| CN103117800A (en) | Fiber optic cable anti-theft monitoring system | |
| CN103473944A (en) | Bus intelligent monitoring system | |
| CN107591888B (en) | Control system and method for power supply of power dispatching data network equipment of transformer substation | |
| CN109656168A (en) | A kind of long-distance intelligent seeks vehicle system and method | |
| CN208298353U (en) | Tunnel fire hazard automatic alarm tele-control system based on Internet of Things Lora agreement | |
| CN202026514U (en) | Electric carrier wave intelligent lighting device | |
| CN202077226U (en) | Electric power carrier wave lighting control device | |
| CN204305022U (en) | A kind of automatic optical-path switching protection system | |
| KR101683140B1 (en) | traffic signal control system for enhancing signal safety and reliability | |
| CN219351737U (en) | Subway communication system | |
| CN204290966U (en) | A kind of optical fiber automatic switchover protection device | |
| CN205177374U (en) | Lamp house for subway tunnel with overcurrent protection | |
| CN211731283U (en) | Automobile intelligent distribution box system | |
| CN103187798A (en) | Channel pre-warning system used for transformer substation |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C12 | Rejection of a patent application after its publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20110413 |