CN1901419A - EPON system for supporting bone fiber optic protection and bone fiber optic protecting method - Google Patents
EPON system for supporting bone fiber optic protection and bone fiber optic protecting method Download PDFInfo
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Abstract
This invention relates to a method for protecting conversion of backbone fibers in an EPON system, which includes: an optical circuit terminal with 1x2 optical switches, a working fiber and protection fiber, the method includes: finding trigger by fault or being triggered by a management event, utilizing 1x2 optical switch to switch the working fiber and th protection fiber to switch the connection of the normal state of the optical circuit terminal and the working fiber to the connection of the trrminal and the protection fiber.
Description
Technical field
The present invention relates to the ethernet passive optical network system, particularly relate to optical fiber protecting equipment and method in the ethernet passive optical network system.
Background technology
Ethernet passive optical network (EPON) technology be a kind of based on ethernet technology, put the optical fiber access technology of multiple spot, it integrates the characteristics such as efficient of the simplicity of ethernet technology and PON (EPON) network, is following one of the fiber-to-the-home best mode of realizing.
The EPON system is made up of the OLT (optical line terminal) of office's side, the ONU (optical network unit) and the ODN (Optical Distribution Network) of user side.General its descending employing broadcast mode, up employing TDMA (time division multiple access access) mode, and can form topological structures (typical structure is a tree structure) such as tree type, star-like, bus-type neatly.So-called " passive " is meant and do not contain any active electronic device and electronic power supply among the ODN, all be made up of optical branching device passive devices such as (Splitter), so the cost of its management maintenance is lower.The key fiber optic protection scheme of existing realization in the EPON system
The undefined protected mode of EPON international standard (IEEE 802.3ah); the formulation of standard committee of China's Telecommunication " access network technology requires---based on the EPON (EPON) of Ethernet mode " in; clearly the G.984.1 protected mode of two kinds of GPON (Gigabit Passive Optical Network) system of ITU-T is adopted in suggestion: key optical fibre protection inverting mode and optical fiber fully protective switching mode, respectively as depicted in figs. 1 and 2.
As shown in Figure 1, in key fiber optic protection mode, the port of active and standby two PON modules of OLT side is connected to two ports of 2:N splitter respectively by active and standby two optical fiber of key optical fiber, adopts conventional the connection from splitter to the ONU side.When OLT master was in running order with the PON module, standby PON module was in the cold standby state.If working optical fibre breaks down or the main PON of using module lost efficacy, enable standby standby PON module and optical fiber.When being switched to standby PON module, the signal emission module in the standby PON module of cold standby is excited to normal operating conditions needs one long period.This mode OLT side need dispose active and standby two PON modules, and key optical fiber need be laid active and standby two optical fiber, thereby realizes that the raising system gets reliability to the protection of key section optical fiber.
In the optical fiber fully protective switching mode, as shown in Figure 2, each ONU by active and standby two PON modules with two independently optical branching device realize dual-homed the connection, each splitter is connected to two PON mouths of OLT.The OLT spare module adopts the Hot Spare mode, switches on each ONU and carries out, and needs handoff protocol.This mode OLT and ONU all need dispose active and standby two PON modules; key optical fiber need be laid active and standby two optical fiber, two splitters need be set, and each ONU is laid active and standby two incoming fiber optics; thereby realize the protection to each network element in the EPON system, the raising system gets reliability.
Key fiber optic protection mode is less with respect to optical fiber fully protective switching mode cost, only the key section optical fiber of EPON system is realized protection; And optical fiber fully protective switching mode has thoroughly been eliminated the Single Point of Faliure hidden danger in the EPON system, but cost also is whole double.From as can be seen above, the dual mode that is adopted in the present EPON system all needs the PON module of configuring redundancy etc., and cost is higher, and realization mechanism is comparatively complicated.And the EPON technology is one of access network technology, is mainly used in the wideband switch-in business of FTTH (Fiber to the home)/FTTB (Fiber-To-The-Building), and user's cost of access is comparatively responsive, and to protection require relatively low.Therefore, the actual application value of the existing two kinds of protected modes of EPON system is lower.
In addition, EPON adopts the tree topology of point to multiple spot, the fault of key optical fiber can cause under it ONU all can't with EPON network service, therefore, the survivability of key optical fiber will guarantee the reliability of whole EPON network.Simultaneously, because the incoming fiber optic majority of Access Network tip is same route, this moment, optical fiber fully protective switching mode did not have practical significance.Therefore, key optical fibre protection inverting mode will be the main protection switchover mode of reliability during raising EPON system uses in network.
Summary of the invention
The purpose of the inventive method provide a kind of in the EPON system method of simple key optical fibre protection inverting, and the EPON system of support backbone fiber optic protection.
More particularly,, in improving the EPON system, in reliability, the stability, take into account system cost, realize a kind of low cost and simple and feasible EPON network backbone fiber optic protecting method and the EPON system of support backbone fiber optic protection according to the present invention.
According to an aspect of the present invention, a kind of ethernet passive optical network system of support backbone fiber optic protection is provided, described system comprises: at the optical line terminal of office's side, have the EPON module, the light signal that being used to receive optical access network provides also transmits by optical fiber this light signal to user side; At at least one optical network unit of user side, be used to receive the light signal that transmits from optical line terminal; Working optical fibre is used for working in normal operation to transmit light signal; Protection optical fiber is used for working when the working optical fibre fault to transmit light signal; The 2:N optical branching device, two input port respectively with working optical fibre and the protection optical fibre coupling, be used for and realize the beam split on N road and to be sent to described at least one optical network unit from the light signal of working optical fibre or protection optical fiber, wherein said optical line terminal also comprises: control module is switched in protection, under the situation of working optical fibre fault, send switching signal and come the protection of Control work optical fiber and protection optical fiber to switch; With 1 * 2 optical switch; the delivery outlet of its input port and described EPON module couples; two delivery outlet respectively with working optical fibre and the protection optical fibre coupling; be used to respond the switching signal that control module is switched in protection, by the switching realization working optical fibre of two delivery outlets and switching of protection optical fiber.
According to an aspect of the present invention, a kind of ethernet passive optical network system of support backbone fiber optic protection is provided, described system comprises: at the optical line terminal of office's side, have the EPON module, the light signal that being used to receive optical access network provides also transmits by optical fiber this light signal to user side; At at least one optical network unit of user side, be used to receive the light signal that transmits from optical line terminal; Working optical fibre is used for working in normal operation to transmit light signal; Protection optical fiber is used for working when the working optical fibre fault to transmit light signal; The 2:N optical branching device; two input port respectively with working optical fibre and the protection optical fibre coupling; be used for and realize the beam split on N road and to be sent to described at least one optical network unit from the light signal of working optical fibre or protection optical fiber; wherein said optical line terminal also comprises: 1 * 2 optical switch; the delivery outlet of its input port and described EPON module couples; two delivery outlet respectively with working optical fibre and the protection optical fibre coupling; be used to respond forced-triggered signal, by the switching realization working optical fibre of two delivery outlets and switching of protection optical fiber from network management system.
According to another aspect of the present invention; the method of key optical fibre protection inverting in a kind of EPON system is provided; described EPON system comprises: optical line terminal, working optical fibre and protection optical fiber with 1 * 2 optical switch; described method comprises the steps: to trigger or triggered by Admin Events by fault discovery; utilize 1 * 2 optical switch switch operating optical fiber and protection optical fiber, make with optical line terminal with being connected of normal condition of working optical fibre switching to optical line terminal and protect being connected of optical fiber.
Wherein said optical line terminal also has protection and switches control module and PON module, and the EPON system also comprises at least one optical network unit, under situation about triggering by fault discovery, described method also comprises: by PON module real-time report correlation behavior information, the operating state that control module is monitored the PON module is in real time switched in protection; If determine that the PON module itself breaks down; then protection is switched control module to the webmaster high severity alarm; if protection is switched control module and is received relevant alarm from the PON module; conclude that then open circuit fault appears in working optical fibre; protection is switched control module and is triggered 1 * 2 optical switch switch operating optical fiber and protection optical fiber, simultaneously handover event is reported webmaster.
And wherein also comprise: after switching, it is only abnormal to determine that the PON module receives; If it is normal that the PON module receives light positive, then protection is switched control module and is triggered optical line terminal and begin automatic discovery procedure after key optical fiber is switched, if the PON module does not still have reception light, concludes that then all optical network units roll off the production line or protect fiber failure.
Description of drawings
The following drawings constitutes the part of specification and provides and further specifies of the present invention, and embodiments of the invention are described.
Fig. 1 illustrates traditional EPON system backbone optical fibre protection inverting mode;
Fig. 2 illustrates traditional EPON system full guard optical fiber switchover mode;
Fig. 3 illustrates the normal operating conditions according to the EPON system of support backbone fiber optic protection of the present invention;
Fig. 4 illustrates according to the operating state after the switching of the EPON system of support backbone fiber optic protection of the present invention.
Fig. 5 illustrates the flow chart of realization according to the optical fibre protection inverting of the EPON system of support backbone fiber optic protection of the present invention.
Embodiment
Fig. 3 illustrates the normal operating conditions according to the EPON system of support backbone fiber optic protection of the present invention.Fig. 4 illustrates according to the operating state after the switching of the EPON system of support backbone fiber optic protection of the present invention.
As shown in Figure 3, the EPON system of simple key optical fibre protection inverting that can realize according to the present invention comprises: optical line terminal (OLT) 1, be arranged on an innings side, and the light signal that being used to receive optical access network provides also transmits by optical fiber this light signal to user side; Working optical fibre 2 is used for working in normal operation to transmit light signal; Protection optical fiber 3 is used for working when working optical fibre 2 faults to transmit light signal; 2:N optical branching device 4 is used for and will realizes the beam split on N road and be sent to optical network unit from the light signal of working optical fibre 2 or protection optical fiber 3; With at least one optical network unit 5 (ONU 1 to ONU N), be set at user side, be used to receive the light signal that transmits from optical line terminal 1 through 4 beam split of 2:N optical branching device.
OLT 1 comprises PON module 11, protects and switch control module 12 and 1 * 2 optical switch 13.PON module 11 is used to receive the light signal that optical access network provides and sends this light signal to user side, and PON module 11 can be sent warning information according to the working condition of the optical fiber that couples with it simultaneously, loses with Signal Degrade as light signal and alarms.Protection is switched control module 12 and is used under the situation of working optical fibre fault, sends switching signal and comes the protection of Control work optical fiber 2 and protection optical fiber 3 to switch.Protection switch control module 12 can by its port can with PON module 11 between set up and communicate by letter; monitor the operating state of PON module 11 in real time; and obtain the state information (for example PON module 11 faults own) of PON module 11 or obtain the warning information of relevant line fault from PON module 11, as key line fault (light signal is lost), Signal Degrade etc.When PON module 11 is received the working optical fibre warning information, protection is switched the protection of control module 12 execution work optical fiber 2 and protection optical fiber 3 and is switched.The structure that control module 12 is switched in protection is not limited to a certain specific concrete structure, and it can be made up by software, hardware, firmware, circuit or its and realize, as long as it can realize that above-mentioned protection switches the function of control module 12.1 * 2 optical switch 13 is used for switching in the response protection switching signal of control module 12, by the switching realization working optical fibre 2 of two delivery outlet and switching of protection optical fiber 3.
The input with output PON mouth and 1 * 2 optical switch 13 of PON module 11 couples.Two delivery outlets of 1 * 2 optical switch 13 couple with working optical fibre 2 and protection optical fiber 3 respectively, working optical fibre 2 and protect optical fiber 3 to be connected two input ports of 2:N splitter 4 again respectively.5 sides adopt conventional the connection from 2:N splitter 4 to optical network unit, and optical network unit 5 adopts conventional ONU.
Optical network unit 5 comprises PON module 15, is used for receiving, send light signal by its PON mouth.
When the EPON system normal operating conditions that can realize simple key optical fibre protection inverting according to the present invention, PON module 11 has started and has been connected with working optical fibre 2 by its output PON mouth.At this moment, the operating state and relevant warning information of the PON module 11 among the control module 12 on-line monitoring OLT 1 switched in protection.When protection is switched after control module 12 confirms that PON modules 11 itself do not have fault; if receive from PON module 11 about warning information such as line fault (losing), Signal Degrades as light signal the time; determine to switch; and trigger 1 * 2 optical switch 13 and realize switching; promptly the normal operating conditions that is connected with working optical fibre 2 by its output PON mouth from PON module 11 switch to PON module 11 by its output PON mouth with protect switching that optical fiber 3 is connected after operating state, thereby the masterslave switchover of realization EPON system backbone optical fiber.The connection status of the system after switching as shown in Figure 4.
1 * 2 optical switch 13 finish switch after; because the length of primary, spare optical fiber (being working optical fibre 2 and protection optical fiber 3) can not be identical; for avoiding the uplink service conflict; protection is switched control module 12 and can be triggered PON module 11 simultaneously and initiate processes such as discovery, range finding, registration again, thereby the protection of finishing the EPON system business is switched.
In addition, switch control module 12 when detecting PON module 11 and breaking down when protection, protection is switched control module 12 and is submitted high severity alarm to network management system, to wait for the maintenance to PON module 11.
Thus; at the big key optical fiber of the probability that breaks down in the EPON system; realized key optical fibre protection inverting function according to EPON of the present invention system with simple structure; and has a PON module alarm function; and need not to dispose extra PON module, realized the protection of key optical fiber thus and reduced the cost of whole system.
According to another embodiment of the present invention, switching can be executed by network management system, rather than carries out according to the detection case to PON module 11.Therefore, in this case, do not need to switch control module 12.The response of 1 * 2 optical switch 13 realizes the switchings of working optical fibre 2 to protection optical fiber 3 from the triggering signal of network management system, and promptly the normal operating conditions that is connected with working optical fibre 2 by its output PON mouth from PON module 11 switches to the operating state after PON module 11 is exported the PON mouth and protected switching that optical fiber 3 is connected by it.Because system in this case constitutes except not needing to switch the control module 12, and is basic identical with system's formation of first embodiment, therefore do not repeat them here.
Fig. 5 illustrates the flow chart of realization according to the optical fibre protection inverting of the EPON system of support backbone fiber optic protection of the present invention.
Optical fibre protection inverting can carry out when following two kinds of situations:
● auto switching: trigger by fault discovery, as dropout etc.;
● Forced Switch: trigger by Admin Events.
As shown in Figure 5, APS begins from step S1.At step S1, the protection of system is switched control module 12 and is started.At step S2, control module 12 operating state of monitoring PON module 11 is in real time switched in protection, for example can be by the mode of poll, and PON module 11 real-time report correlation behavior information are switched control module 12 to protection.
In step S3, switch according to protection and whether normally to communicate by letter between control module 12 and the PON module 11, determine whether that PON module 11 itself breaks down.If determine that in step S3 PON module 11 itself breaks down, then flow process enters step S4.At step S4, protection is switched control module 12 to the webmaster high severity alarm, and waits for the maintenance to PON module 11.If determine that in step S3 PON module 11 is own normal, then flow process enters step S5.At step S5, according to the relevant alarm of whether receiving from PON module 11, as light signal lose, the alarm of Signal Degrade, determine whether key working optical fibre 2 has fault, for example open circuit fault.If step S5 be defined as be, at step S6, protection is switched control module 12 and is triggered 1 * 2 optical switch, 13 switch operating optical fiber 2 and protection optical fiber 3, simultaneously handover event is reported webmaster, flow process enters step S7 then.If determining protection in step S5 switches control module 12 and does not receive relevant alarm from PON module 11; promptly there is not relevant alarm such as line fault, Signal Degrade; determine that then PON module 11 and working optical fibre 2 are working properly; flow process turns back to step S2, continues to carry out the real-time monitoring to PON module 11.
At step S7, determine that 1 * 2 optical switch 13 switches after, PON module 11 receives only abnormal.If after step S7 determined that 1 * 2 optical switch 13 switches, it is normal that PON module 11 receives light positive, then flow process enters step S8.At step S8, the automatic discovery procedure after the key optical fiber of control module 12 triggering OLT, 1 beginning is switched is switched in protection.If after step S7 determines that 1 * 2 optical switch 13 switches, PON module 11 does not still have reception light, concludes that then all ONU roll off the production line or protect optical fiber 3 faults, no longer switches, and system returns step S2.
Below protect the automatic discovery procedure of switching after the key optical fiber of control module 12 triggering OLT, 1 beginning is switched identical, therefore, only it is carried out concise and to the point description with conventional process.
At step S8, OLT 1 is to optical network unit 5 broadcast transmission Discovery GATE frames.At step S9, optical network unit 5 is after receiving Discovery GATE frame, random wait sends REGISTER REQ frame to OLT after a period of time, in REGISTER REQ frame, comprised MAC (Media Access Controlled) address and other parameters of optical network unit 5.At step S10, after OLT 1 receives an effective REGISTER REQ message,, distribute the preceding corresponding logical port identifier (LLID-logical link ID) of optical fibre protection inverting takes place, and bind again according to its MAC Address.At step S11, OLT 1 sends standard GATE frame and sends REGISTER ACK message to allow optical network unit 5.At step S12, optical network unit 5 sends REGISTER ACK message to OLT 1.At step S13, OLT1 receives REGISTER ACK message, checking REGISTER ACK message, and discovery procedure is finished, and calculates RTT value (light signal two-way time).At step S14, optical network unit 5 is finished registration, can visit the EPON network, and business recovery is normal, and protection is switched successfully.
Switch for mandatory protection, mandatory protection is switched in network management system and is triggered 13 switchings of 1 * 2 optical switch, and writes down handover event simultaneously, and following realization flow is with the step S8-S14 of APS realization flow.According to the present invention, on the basis of existing optical fibre protection inverting method,, improve the shortcoming that cost height, realization mechanism complexity are switched in original protection, thereby realize simple and effective key optical fibre protection inverting in conjunction with the application characteristic of EPON system.
The present invention has realized EPON system backbone optical fibre protection inverting with respect to existing method, and cost is low, and realization mechanism is simple, effectively raises the EPON system simultaneously and gets reliability.
The present invention does not need to be configured in the redundant PON module of the costliness that accounts for prime cost in the EPON system, and cost advantage is fairly obvious.In addition, testing mechanism of the present invention is simple, does not need turning protocol, and the present invention do not need to carry out the PON module and activate and switch, and adopts optical switch to switch, and switching time is fast.The present invention only needs built-in 1 * 2 optical switch in PON mouth place to existing OLT, and does not need mounted ONU is made any change, and has the operability of existing network.
Though detailed description of the present invention is at example embodiment, to those skilled in the art, various modification and the replacement form of these embodiment all can be imagined.Therefore, all modification and replacement forms in the clear and definite protection range of the present invention of claims have been contained in the present invention.
Claims (13)
1, a kind of ethernet passive optical network system of support backbone fiber optic protection, described system comprises:
At the optical line terminal of office's side, have the EPON module, the light signal that being used to receive optical access network provides also transmits by optical fiber this light signal to user side;
At at least one optical network unit of user side, be used to receive the light signal that transmits from optical line terminal;
Working optical fibre is used for working in normal operation to transmit light signal;
Protection optical fiber is used for working when the working optical fibre fault to transmit light signal;
2:N optical branching device, two input port respectively with working optical fibre and protection optical fibre coupling, be used for and will realize the beam split on N road and be sent to described at least one optical network unit from the light signal of working optical fibre or protection optical fiber,
Wherein said optical line terminal also comprises:
Control module is switched in protection, under the situation of working optical fibre fault, sends switching signal and comes the protection of Control work optical fiber and protection optical fiber to switch; With
1 * 2 optical switch; the delivery outlet of its input port and described EPON module couples; two delivery outlet respectively with working optical fibre and protection optical fibre coupling, be used to respond the switching signal that control module is switched in protection, the switching by two delivery outlets realizes switching of working optical fibre and protection optical fiber.
2, according to the described system of claim 1, wherein protection switch control module by with described EPON module communication, monitor the operating state of EPON module in real time, judge thus whether working optical fibre has fault.
3. according to the described system of claim 2, wherein switch control module and whether receive from the relevant alarm of EPON module and determine whether working optical fibre has fault according to protection.
4. according to the described system of claim 3, wherein relevant alarm is lost alarm for light signal.
5. according to the described system of claim 3, wherein relevant alarm is the Signal Degrade alarm.
6, according to the described system of claim 1; wherein the protection switch control module by with described EPON module communication; monitor the operating state of EPON module in real time; and switch control module when protection and determine that the EPON module itself breaks down, protection is switched control module to network management alarm.
7, a kind of ethernet passive optical network system of support backbone fiber optic protection, described system comprises:
At the optical line terminal of office's side, have the EPON module, the light signal that being used to receive optical access network provides also transmits by optical fiber this light signal to user side;
At at least one optical network unit of user side, be used to receive the light signal that transmits from optical line terminal;
Working optical fibre is used for working in normal operation to transmit light signal;
Protection optical fiber is used for working when the working optical fibre fault to transmit light signal;
2:N optical branching device, two input port respectively with working optical fibre and protection optical fibre coupling, be used for and will realize the beam split on N road and be sent to described at least one optical network unit from the light signal of working optical fibre or protection optical fiber,
Wherein said optical line terminal also comprises:
1 * 2 optical switch; the delivery outlet of its input port and described EPON module couples; two delivery outlet respectively with working optical fibre and protection optical fibre coupling, be used to respond forced-triggered signal from network management system, the switching by two delivery outlets realizes switching of working optical fibre and protection optical fiber.
8, the method for key optical fibre protection inverting in a kind of ethernet passive optical network system, described ethernet passive optical network system comprises: have optical line terminal, working optical fibre and the protection optical fiber of 1 * 2 optical switch, described method comprises the steps:
Trigger or trigger by fault discovery, utilize 1 * 2 optical switch switch operating optical fiber and protection optical fiber by Admin Events, make with optical line terminal with being connected of normal condition of working optical fibre switching to optical line terminal and protect being connected of optical fiber.
9, in accordance with the method for claim 8; wherein said optical line terminal also has protection and switches control module and EPON module; and the ethernet passive optical network system also comprises at least one optical network unit, and under situation about triggering by fault discovery, described method also comprises:
Wherein protection switch control module by with described EPON module communication, monitor the operating state of EPON module in real time;
If determine that the EPON module itself breaks down, then protection is switched control module to the webmaster high severity alarm,
If protection is switched control module and is received relevant alarm from the EPON module, conclude that then working optical fibre breaks down, protection is switched control module and is triggered 1 * 2 optical switch switch operating optical fiber and protection optical fiber.
10. in accordance with the method for claim 9, wherein relevant alarm is lost fault warning for light signal.
11. according to the described system of claim 9, wherein relevant alarm is the Signal Degrade alarm.
12, in accordance with the method for claim 9, wherein also comprise:
After switching, it is only abnormal to determine that the EPON module receives;
If it is normal that the EPON module receives light positive; then protection is switched control module and is triggered optical line terminal and begin automatic discovery procedure after key optical fiber is switched; if the EPON module does not still have reception light, conclude that then all optical network units roll off the production line or protect fiber failure.
13. wherein also comprise in accordance with the method for claim 8:
Triggering the process that triggers the automatic discovery of optical line terminal initiation when optical switch is switched.
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| CNA200610093010XA CN1901419A (en) | 2006-06-02 | 2006-06-02 | EPON system for supporting bone fiber optic protection and bone fiber optic protecting method |
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| CNA200610093010XA CN1901419A (en) | 2006-06-02 | 2006-06-02 | EPON system for supporting bone fiber optic protection and bone fiber optic protecting method |
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| CN101860770A (en) * | 2010-05-26 | 2010-10-13 | 中国联合网络通信集团有限公司 | Method and system for converging fixed network and mobile network |
| WO2010130123A1 (en) * | 2009-05-14 | 2010-11-18 | 中兴通讯股份有限公司 | Method and apparatus for implementing trunk optical fiber protection in ethernet passive optical network (epon) |
| CN101951290A (en) * | 2010-09-01 | 2011-01-19 | 深圳市业通达实业有限公司 | EPON (Ethernet Passive Optical Network) optical channel protection technology |
| WO2011022900A1 (en) * | 2009-08-29 | 2011-03-03 | 中兴通讯股份有限公司 | Method for time division multiplex service protection |
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| CN102113275A (en) * | 2008-07-31 | 2011-06-29 | 学校法人庆应义塾 | Line control method in optical network and optical network itself |
| CN102113275B (en) * | 2008-07-31 | 2013-09-11 | 学校法人庆应义塾 | Line control method in optical network and optical network itself |
| WO2010130123A1 (en) * | 2009-05-14 | 2010-11-18 | 中兴通讯股份有限公司 | Method and apparatus for implementing trunk optical fiber protection in ethernet passive optical network (epon) |
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| US9030924B2 (en) | 2009-08-29 | 2015-05-12 | Zte Corporation | Method for time division multiplex service protection |
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| CN101860770A (en) * | 2010-05-26 | 2010-10-13 | 中国联合网络通信集团有限公司 | Method and system for converging fixed network and mobile network |
| CN101951290A (en) * | 2010-09-01 | 2011-01-19 | 深圳市业通达实业有限公司 | EPON (Ethernet Passive Optical Network) optical channel protection technology |
| CN102457329A (en) * | 2010-10-19 | 2012-05-16 | 财团法人工业技术研究院 | Passive optical fiber network architecture and protection method and optical switch structure |
| CN102136876B (en) * | 2011-02-11 | 2014-12-31 | 华为技术有限公司 | Light line protection acceleration circuit, light line protection system and method |
| CN102136876A (en) * | 2011-02-11 | 2011-07-27 | 华为技术有限公司 | Light line protection acceleration circuit, light line protection system and method |
| CN112153496A (en) * | 2019-06-29 | 2020-12-29 | 华为技术有限公司 | Protection switching device and method |
| CN112153496B (en) * | 2019-06-29 | 2022-05-13 | 华为技术有限公司 | Protection switching device and method |
| WO2022001584A1 (en) * | 2020-06-30 | 2022-01-06 | 华为技术有限公司 | Optical line terminal (olt) device and optical path processing method |
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