CN202282779U - Optical cable jumper wire device - Google Patents
Optical cable jumper wire device Download PDFInfo
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- CN202282779U CN202282779U CN2011204147825U CN201120414782U CN202282779U CN 202282779 U CN202282779 U CN 202282779U CN 2011204147825 U CN2011204147825 U CN 2011204147825U CN 201120414782 U CN201120414782 U CN 201120414782U CN 202282779 U CN202282779 U CN 202282779U
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Abstract
The utility model relates to an optical cable jumper wire device used for the protection, routing insertion, switching and monitoring of a fiber channel used in optical communication. The device comprises an N*N full crossover optical switch unit, a first optical performance monitoring unit, a second optical performance monitoring unit, an optical network management unit, and an intelligent processing unit, wherein the N*N full crossover optical switch unit is connected with the optical network management unit which is symmetrically connected with the first optical performance monitoring unit and the second optical performance monitoring unit; and the intelligent processing unit is respectively connected with the optical network management unit, the N*N full crossover optical switch unit, the first optical performance monitoring unit and the second optical performance monitoring unit. According to the device provided by the utility model, the signal quality of the multichannel fiber channel can be monitored in a real-time manner, such as luminous flux rate of two ends of equipment, return loss, optical fiber circuit wastage, and the like, to serve as the auxiliary criterion in switching, thereby ensuring the reliable operation of traditional optical communication network.
Description
Technical field
The utility model relate to optical communication with protection, the route of optical-fibre channel patch, switching, device for monitoring, particularly relate to a kind of optical cable bridle wire apparatus.
Background technology
Along with operator is increasingly high to the reliability service requirement of optical communication transmission system; Intervention means to optical cable has automatic protection, patches route, switches scheduling, signal monitoring etc.; Wherein route is protected, patched to optical fiber automatically, three kinds of modes of switching scheduling are based on the optical cable physical layer fully; All can realize the recovery of light path at 50ms in the time,, automatically optical communication transmission system or link switched to predetermined optical-fibre channel more rationally from current service aisle in real time according to optical fiber running status or fiber management person's needs; And then realize lightguide cable link automatic protection, patch route, switch scheduling, signal monitoring; Guarantee the reliability service of optical fiber transmission network, effectively raise the utilance of optical-fibre channel, realize the reasonable disposition of optical fiber link.The patent of now existing fiber optic protection and monitoring aspect, but they all propose four optical-fibre channels simultaneously defencive function and eight optical-fibre channels patch route, switching scheduling feature.
Use above-mentioned patent and protect and have many difficult points to this system, weak point mainly exists:
One, needing to lay reserve cable, is a bigger engineering and lay reserve cable, need take human resources, financial resource and the time resource added.
Two, can not redundancy protecting such as carry out 1: 2,1: 3 to optical-fibre channel; Existing protected mode mainly is 1+1 perhaps 1: 1; When reserve cable occurred unusual simultaneously or has little time to keep in repair, the protection equipment of this moment will perform practically no function, and the optical communication transmission network network will be in the state of paralysis.
Three, above patent does not all have the function that the automatic route of optical fiber patches.
Four, above patent does not all have the function that the optical fiber scheduling is switched.
Five, above patent does not all have the function of fiber-optic monitoring and preferential management.
Summary of the invention
The purpose of the utility model is exactly in order to solve the prior art problem that the logical transmission network network of light exists; A kind of a kind of optical cable bridle wire apparatus that fiber optic cable monitor, route patched, protect automatically, switched the dispatching management function that possesses has been proposed; This device can be applied to the high-capacity optical cable transmission network, and has end-to-end interconnecting function.
The utility model adopts technical scheme specific as follows:
A kind of optical cable bridle wire apparatus comprises the full cross light switch element of NxN, the first optical property monitoring means, the second optical property monitoring means, optical network management unit, intelligent processing unit; Said NxN is complete, and the cross light switch element connects with optical network management unit; Said optical network management unit is symmetrically connected with the first optical property monitoring means and the second optical property monitoring means, and said intelligent processing unit connects optical network management unit, the full cross light switch element of NxN, the first optical property monitoring means and the second optical property monitoring means respectively.
Said optical network management unit comprises optical transceiver module, a 1xN optical switch, the 2nd 1xN optical switch, optical branching device; The receiving terminal of said optical transceiver module connects a 1xN optical switch; Transmitting terminal connects the 2nd 1xN optical switch, and each switching channel port of a described 1xN optical switch and the 2nd 1xN optical switch all is connected with one first optical branching device.
The said first optical power monitoring unit and the second optical power monitoring unit comprise the optical power monitoring unit group corresponding with the full cross light switch element of NxN number of channels; Said optical power monitoring unit group comprises one second optical branching device, two photo-detectors, and two photo-detectors are connected with the small end of the second optical branching device both sides respectively.
Said 1xN optical switch adopts mems optical switch.
Said first optical branching device adopts light wavelength division multiplexing.
Said second optical branching device adopts the 2x2 optical coupler.
The advantage of the utility model is:
1, can monitor the signal quality of 16 optical-fibre channels in real time through the optical property monitoring means, it mainly comprises equipment two ends light passband, return loss, optical fiber loop loss etc., the assistant criteria during as switching, the reliability service of assurance optical communication legacy network.
2, effectively monitor the idle fiber resource and the route of high-capacity optical cable; Realize that optical fiber quality monitoring, preferential management, scheduling that network manager can be intervened are switched, route patches function automatically; The resource utilization and the network operation efficient that improve, and practiced thrift cost and time.
3, optical-fibre channel was carried out 1: 2,1: 3 etc. not having the blocking-up redundancy protecting, improved the operational reliability of network system.
4,, realize that intelligent optical cable wire jumper internal system handshake in the transmission network, sequential transmit with the communication that clock synchronization signaling or manager intervene signaling synchronously through optical network management unit.
5, can be regular with homemade optical-fibre channel monitoring according to client's priority level or network manager, light quality, signal condition are monitored in real time.
6, intelligent processing unit is accomplished system acting or gerentocratic intervention command according to each facility information and each optical fiber link information in the system that gathers in conjunction with the real-time signaling that advanced person's algoritic module and optical network management unit are carried.
Description of drawings
The structural representation of a kind of optical cable bridle wire apparatus of Fig. 1, the utility model;
A kind of optical cable bridle wire apparatus of Fig. 2, the utility model is used sketch map.
Wherein:
1: the first optical property monitoring means; 2: the second optical property monitoring means;
3: optical network management unit; The full cross light switch element of 4:NxN;
5: intelligent processing unit; 203: optical transceiver module;
204: the one 1xN optical switches; 205: the two 1xN optical switches;
206---221: the first optical branching devices;
222---237: the second optical branching devices;
238---269: photo-detector;
301: the first circuit modules; 302: the second circuit module;
303: data processing, interface control circuit module; 304: the optical switch drive circuit module;
305: the central processing circuit module;
A1-A4: light signal input port; B1-B4: light signal input port;
A4-A8: light signal output end mouth; B4-B8: light signal output end mouth;
6---15: the optical cable bridle wire apparatus of the utility model;
Embodiment
Below in conjunction with embodiment and accompanying drawing a kind of optical cable bridle wire apparatus of the utility model is made detailed description.
As shown in Figure 1, a kind of optical cable bridle wire apparatus of the utility model comprises the full cross light switch element of NxN, the first optical property monitoring means, the second optical property monitoring means, optical network management unit, intelligent processing unit; Said NxN is complete, and the cross light switch element connects with optical network management unit; Said optical network management unit is symmetrically connected with the first optical property monitoring means and the second optical property monitoring means, and said intelligent processing unit connects optical network management unit, the full cross light switch element of NxN, the first optical property monitoring means and the second optical property monitoring means respectively.
Said optical network management unit comprises optical transceiver module, a 1xN optical switch, the 2nd 1xN optical switch, optical branching device; The receiving terminal of said optical transceiver module connects a 1xN optical switch; Transmitting terminal connects the 2nd 1xN optical switch, and each switching channel port of a described 1xN optical switch and the 2nd 1xN optical switch all is connected with one first optical branching device.Said 1xN optical switch adopts MEMS (MEMS) optical switch, and said first optical branching device adopts light wavelength division multiplexing.
The said first optical power monitoring unit and the second optical power monitoring unit comprise the optical power monitoring unit group corresponding with the full cross light switch element of NxN number of channels; Said optical power monitoring unit group comprises one second optical branching device, two photo-detectors, and two photo-detectors are connected with the small end of the second optical branching device both sides respectively.Said second optical branching device adopts the 2x2 optical coupler.
The embodiment of the utility model provides is to realize that the optical cable bridle wire apparatus structure that patches route, switches scheduling feature of defencive function and eight optical-fibre channels of four optical-fibre channels is as shown in Figure 2.This device comprises a full cross light switch element of 8x8, two optical property monitoring means, an optical network management unit, an intelligent processing unit.
The full cross light switch element of 8x8 comprises 16 1x8 optical switches and 1 circuit module.The full cross light switch element 4 of said 8x8 each side has 8 optical ports, amounts to 16 optical ports, and said optical port is connected with 16 optical-fibre channels respectively.The optical port of the full cross light switch element of 8x8 4 left and right sides all is connected with optical network management unit 3, and optical network management unit 3 left and right sides are symmetrical set the first optical property monitoring means 1, the second optical property monitoring means 2.Optical switch drive circuit module 304 in the full cross light switch element of 8x8 is connected through the central processing circuit module 305 in the intelligent processing unit 5 of high-speed communication interface and this device, to transmit 8x8 full cross light switch motion switching command and the full cross light on off state of 8x8 information;
Optical network management unit 3 comprises 1 transceiver module, 2 MEMS 1x8 optical switches, 16 wavelength division multiplexers, 1 circuit module.A MEMS 1x8 optical switch, 8 wavelength division multiplexers are symmetricly set in the transmitting terminal and the receiving terminal of optical transceiver module.The reflection end of 8 wavelength division multiplexers 206～213 is with 4 passages in a MEMS 1x8 optical switch 204 and the 2nd MEMS 1x8 optical switch 205; Amounting to 8 passages is connected respectively; The common port of the one MEMS 1x8 optical switch 204 is connected with the receiving terminal of optical transceiver module 203; The transmitting terminal of optical transceiver module 203 links to each other at the back and is connected to the common port of the 2nd MEMS 1x8 optical switch 205; The one MEMS 1x8 optical switch 204 and 4 remaining passages of the 2nd MEMS 1x8 optical switch 205, the reflection end that amounts to 8 wavelength division multiplexers 230～237 that 8 passages then are provided with the right side is connected respectively.First circuit module 301 in the optical network management unit all has connection with a MEMS 1x8 optical switch 204, the 2nd MEMS 1x8 optical switch 205, optical transceiver module 203.First circuit module 301 is responsible for the signal processing in these unit, mainly comprises opto-electronic conversion, decoding, data check, signaling parsing, data are obtained and follow-up framing, verification, coding, electric light conversion etc.First circuit module is connected with the intelligent processing unit 5 of this device through high-speed communication interface, so that interactive system network management information, this status information of equipment, the optical-fibre channel information etc. of link up and down.
The first optical property monitoring means 1 and the second optical property monitoring means 2 comprise 16 photo-detectors, 8 couplers, circuit module respectively.Coupler adopts the 2x2 coupler, and 2 photo-detectors connect the small end of 2x2 coupler respectively.The first optical property monitoring means 1 and the second optical property monitoring unit, 2 symmetric configurations are in the left and right sides of the full cross light switch element 4 of 8x8; The big end in left side of 8 couplers in the said first optical property monitoring means connects 8 optical-fibre channels of the utility model optical cable bridle wire apparatus A side respectively; The big end in right side of 8 couplers divides the common port of device to be connected with 8 wavelength-divisions of optical network management unit 3 inputs respectively again in the first optical property monitoring means 1, and promptly the big end in the right side of 2x2 coupler 222～229 is connected with the common port of wavelength division multiplexer 206～213 respectively; The left side small end of said 2x2 coupler 222～229 is connected with photo-detector 238～245 respectively, and the right side small end of said 2x2 coupler 222～229 then is connected with photo-detector 246～253 respectively.Second circuit module 302 in the first optical property monitoring means 1 all has connection with photo-detector 222～253.The big end in right side of 8 couplers is connected with 8 optical-fibre channels of the utility model optical cable bridle wire apparatus B side respectively in the said second optical property monitoring means 2; The big end in left side of 8 couplers is connected with the common port of 8 wavelength division multiplexers of optical network management unit 3 outputs respectively in the second optical property monitoring means 2, promptly the big end in the left side of 2x2 coupler 230～237 respectively with optical network management unit in the common port of wavelength division multiplexer 230～237 be connected.The left side small end of said 2x2 coupler 230～237 is connected with photo-detector 254～261 respectively, and the right side small end of said 2x2 coupler 230～237 then is connected with photo-detector 262～269 respectively.Data processing, interface control circuit module 303 in the second optical property monitoring means 2 all have connection with photo-detector 254～269.The function of the first optical property monitoring means and the second optical property monitoring means is the signal quality parameter of monitoring 16 optical-fibre channels in real time; It mainly comprises equipment loss, return loss, optical fiber loop loss etc., and can be used as the assistant criteria of the full cross light switch element of 8x8 action when switching.Optical network management unit can be monitored the state of optical fiber link in real time, detects the idle link in the optical cable route, and regularly according to the registration of sorting of certain rule.Intelligent optical cable wire jumper internal system handshake in the transmission network also can be realized in this unit, sequential is synchronous and clock synchronization signaling or manager intervene the communication transmission of signaling.The monitoring of tools information and the optical fiber link monitor message of first circuit module 301 and optical switch drive circuit module 304 responsible comprehensive optical property monitoring means; And be connected with the intelligent processing unit 5 of this device through high-speed communication interface, so that intelligent processing unit is in time grasped each channel status information of this equipment, the optical-fibre channel information etc. of link up and down.
Intelligent processing unit comprises network management protocol processing module ENM, log processing module, algoritic module, synchronization module etc.Its function of intelligent processing unit is agreement that be responsible for to handle network management interface with the real-time signaling that optical network management unit is carried, gather the optical fiber loop that each optical property monitoring means reports and the information of equipment quality; Patch algorithm and protect algorithm automatically in conjunction with the optical fiber link route, accomplish system acting or gerentocratic intervention command.Central processing circuit module 305 is connected with optical network management unit, the full cross light switch element of 8x8, optical property monitoring means respectively through high-speed communication interface in the intelligent processing unit.
Adopt the device of the utility model to realize that the process of technical purpose is specific as follows:
The A side ports of the utility model optical cable bridle wire apparatus and B port are respectively the light signal input and output interface of this device, insert the optical cable signal of these device both sides respectively.The coupler in the first optical property monitoring means and the first optical property monitoring means and the combination of photo-detector realize the monitoring to each optical-fibre channel optical property parameter; Adopting the up optical path signal transmission route of the utility model device is Ax → By (x=1～4; Y=1～4); Descending optical path signal transmission route Bx → Ay (x=1～4, y=1～4) is an example with A1 → B1 light path process: light signal is through coupler 222 beam split; Get into photo-detector 246, photo-detector 246 can be realized the monitoring of input signal power; This light signal is when circuit process wavelength division multiplexer 206 and the full cross light of 8x8 switch element 4; Can generate reflected signal, oppositely get into 2x2 coupler 222 once more, after 222 beam split of 2x2 coupler; Get into detector 238, photo-detector 238 can be surveyed the reflected power signal of the system of obtaining.Photo-detector 238 is monitored the return loss value that the subtraction value of power after circuit conversion, sampling is this system with photo-detector 246, and the subtraction value that optical property monitoring means 3 is monitored performance numbers with photo-detector 238 and photo-detector 246 is transferred to intelligent processing unit 5.Light signal gets into the common port of wavelength division multiplexer 206, and wavelength division multiplexer 206 is divided into two-way to light signal, wherein in one the tunnel; System signal gets into a port of the full cross light switch element 4 of 8x8 through the transmission end of wavelength division multiplexer 206; When the full cross light switch element 4 startup work of 8x8, system signal light is switched to the transmission end that destination interface is input to wavelength division multiplexer 214, export through the common port of wavelength division multiplexer 214 again; Hold greatly in the left side that enters into 2x2 coupler 230; After beam split, get into photo-detector 262, can monitor the luminous power of this passage output signal.Light signal is big end output through the right side of 2x2 coupler 230, gets into the optical-fibre channel of the B of system side.Light signal is in the process of optical-fibre channel transmission; Part of nodes can be run into, for example when attenuator, optical switch etc., reflected signal can be produced into; Reflected signal oppositely gets into 2x2 coupler 230; After beam split, get into photo-detector 254, photo-detector 254 can be surveyed the reflected power signal of the follow-up optical-fibre channel of the utility model device.Photo-detector 254 is monitored the return loss value that the subtraction value of power after circuit conversion, sampling is the follow-up optical-fibre channel of this utility model device with detector 262, and the return loss value of the follow-up optical-fibre channel of said the utility model device is transferred to intelligent processing unit 5 through the second optical property monitoring means 2.
Light signal gets into another road light path behind the wavelength division multiplexer 206, is to extract the monitor optical signal, behind the monitor optical signal demultiplexing; Export through wavelength division multiplexer 206 reflection ends; Get into one of them passage of a MEMS 1x8 optical switch 204, this moment, system switched to this passage with a MEMS 1x8 optical switch 204, like this; The monitor optical signal is through the common port output of a MEMS 1x8 optical switch 204, and the back gets into the receiving terminal of transceiver module 203.Obtain through opto-electronic conversion, decoding, data check, signaling parsing, data; The handshake that transceiver module 203 carries pilot signal, sequential synchronously and clock synchronization signaling and gerentocratic intervention signal demodulation come out to be transferred to the intelligent processing unit 5 of system; Intelligent processing unit 5 can pass to the information of intelligent processing unit 5 according to above-mentioned demodulating information and the first optical property monitoring unit 1, the second optical property monitoring unit 2; After treatment, as the criterion of full cross light switch element 4 change actions of 8x8.Simultaneously transceiver module 203 with system get transmission equipment information on quality state and the node thereof of passage action command information and each optical fiber link of this equipment, this equipment loss of light signal monitoring, up and down link information such as light channel loss, and manager's intervention command of this system node through framing; Verification, coding, electric light conversion back generate the monitor optical signal; Get into the transmitting terminal of transceiver module 203; Get into the common port of the 2nd MEMS 1x8 optical switch 205; This moment, the utility model device switched to a wherein passage with the 2nd MEMS 1x8 optical switch 205, and the monitor optical signal gets into the reflection end of wavelength division multiplexer 214 through this passage output; With the transmitting optical signal ECDC ripple of the full cross light switch element of 8x8 4 outputs multiplexing after, by the common port output of wavelength division multiplexer 214.
A kind of optical cable bridle wire apparatus of this utility model can be widely used in fields such as optical communication transmission network network, IPTV monitor network, power private network.
The application of a kind of optical cable bridle wire apparatus that the utility model is related is applied to the high-capacity optical cable transmission network specifically referring to Fig. 2, and has end-to-end interconnecting function.Use the communication network of the utility model and can realize that protection automatically in 1: 1, automatic protection in 1: 3 and route patch function.The realization of automatically protecting at 1: 1 is specific as follows: adopt the optical cable bridle wire apparatus 11 of the utility model to be the protection to four wavelength signals with optical cable bridle wire apparatus 12 in the A net.The data that intelligent processing unit sends according to optical cable bridle wire apparatus 11 and optical cable bridle wire apparatus 12 interior lights performance monitoring unit; Calculate the quality condition of optical-fibre channel between them; Then according to handoff algorithms; And the switching command that handoff algorithms draws is transferred to the other side each other through optical network management unit, carry out 1: 1 automatic switching protection subsequently.
The realization of automatically protecting at 1: 3 is specific as follows: optical cable bridle wire apparatus 15 is the protection to a wavelength signals with optical cable bridle wire apparatus 6 in the B net.The data that intelligent processing unit sends according to optical cable bridle wire apparatus 1 and optical cable bridle wire apparatus 2 interior lights performance monitoring unit; Calculate the quality condition of every optical-fibre channel between them; Then according to algorithm, every optical-fibre channel is registered and sorted, and calculate optimum subsequent use switching channel; Then switching command is transferred to the other side each other through optical network management unit, accomplishes 1: 3 automatic switching protection subsequently.
Route patches function and realizes specific as follows: between optical cable bridle wire apparatus 11 and the optical cable bridle wire apparatus 13 many barss transmission path is arranged in the B net; When if the current path optical cable breaks down; The combined data that optical cable bridle wire apparatus 11, optical cable bridle wire apparatus 13, optical cable bridle wire apparatus 12, optical cable bridle wire apparatus 14 inner intelligent processing units send according to interior lights performance monitoring unit; Calculate the quality condition of every optical-fibre channel between them; And determine idle fiber links, then according to algorithm, idle optical-fibre channel is registered and sorted; And calculate optimum routing channel; Arrive optical cable bridle wire apparatus 13 if any optical cable bridle wire apparatus 11 through device optical cable wire jumper 12, then route is patched order and be transferred to the other side's optical cable bridle wire apparatus 11, optical cable bridle wire apparatus 12 and optical cable bridle wire apparatus 13 each other, accomplish the function that route patches subsequently through optical network management unit.
Claims (6)
1. an optical cable bridle wire apparatus is characterized in that: comprise the full cross light switch element of NxN, the first optical property monitoring means, the second optical property monitoring means, optical network management unit, intelligent processing unit; Said NxN is complete, and the cross light switch element connects with optical network management unit; Said optical network management unit is symmetrically connected with the first optical property monitoring means and the second optical property monitoring means, and said intelligent processing unit connects optical network management unit, the full cross light switch element of NxN, the first optical property monitoring means and the second optical property monitoring means respectively.
2. a kind of optical cable bridle wire apparatus as claimed in claim 1; It is characterized in that: said optical network management unit comprises optical transceiver module, a 1xN optical switch, the 2nd 1xN optical switch, optical branching device; The receiving terminal of said optical transceiver module connects a 1xN optical switch; Transmitting terminal connects the 2nd 1xN optical switch, and each switching channel port of a described 1xN optical switch and the 2nd 1xN optical switch all is connected with one first optical branching device.
3. a kind of optical cable bridle wire apparatus as claimed in claim 1; It is characterized in that: the said first optical power monitoring unit and the second optical power monitoring unit comprise the optical power monitoring unit group corresponding with the full cross light switch element of NxN number of channels; Said optical power monitoring unit group comprises one second optical branching device, two photo-detectors, and two photo-detectors are connected with the small end of the second optical branching device both sides respectively.
4. a kind of optical cable bridle wire apparatus as claimed in claim 2 is characterized in that: said 1xN optical switch adopts mems optical switch.
5. a kind of optical cable bridle wire apparatus as claimed in claim 2 is characterized in that: said first optical branching device adopts light wavelength division multiplexing.
6. a kind of optical cable bridle wire apparatus as claimed in claim 3 is characterized in that: said second optical branching device adopts the 2x2 optical coupler.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204147825U CN202282779U (en) | 2011-10-27 | 2011-10-27 | Optical cable jumper wire device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204147825U CN202282779U (en) | 2011-10-27 | 2011-10-27 | Optical cable jumper wire device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202282779U true CN202282779U (en) | 2012-06-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011204147825U Expired - Lifetime CN202282779U (en) | 2011-10-27 | 2011-10-27 | Optical cable jumper wire device |
Country Status (1)
| Country | Link |
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| CN (1) | CN202282779U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104660326A (en) * | 2015-02-13 | 2015-05-27 | 田勐 | High-speed and automatic SDH (synchronous digital hierarchy) switching method and device based on channel quality |
| WO2015180469A1 (en) * | 2014-05-27 | 2015-12-03 | 华为技术有限公司 | Optical switch and wavelength division multiplexing optical system |
-
2011
- 2011-10-27 CN CN2011204147825U patent/CN202282779U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015180469A1 (en) * | 2014-05-27 | 2015-12-03 | 华为技术有限公司 | Optical switch and wavelength division multiplexing optical system |
| US10031294B2 (en) | 2014-05-27 | 2018-07-24 | Huawei Technologies Co., Ltd. | Optical switch and wavelength division multiplexing optical system |
| CN104660326A (en) * | 2015-02-13 | 2015-05-27 | 田勐 | High-speed and automatic SDH (synchronous digital hierarchy) switching method and device based on channel quality |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
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Granted publication date: 20120620 |