CN101547085A - Physical layer port master-slave configuration method, device and communication system - Google Patents
Physical layer port master-slave configuration method, device and communication system Download PDFInfo
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- CN101547085A CN101547085A CN200910136237A CN200910136237A CN101547085A CN 101547085 A CN101547085 A CN 101547085A CN 200910136237 A CN200910136237 A CN 200910136237A CN 200910136237 A CN200910136237 A CN 200910136237A CN 101547085 A CN101547085 A CN 101547085A
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Abstract
The invention relates to communication technology field, discloses master-slave configuration method, device and communication system of physical layer port, wherein physical layer port master-slave configuration method comprises: first synchronization clock mass is received from first physical layer port; the first synchronization clock is transmitted by second physical layer port connected with the first physical layer port; it is judged if priority of first synchronization clock mass is higher than that of second synchronization clock mass; the second synchronization mass is from clock synchronization domain of network equipment of first physical layer port; if priority of first synchronization clock mass is higher than that of second synchronization clock mass, the first physical layer port is set as slave mode; if priority of first synchronization clock mass is lower than that of second synchronization clock mass, the first physical layer port is set as master mode. The technical scheme of the embodiment can automatically perform master-slave configuration for physical layer port.
Description
Technical field
The present invention relates to communication technical field, be specifically related to physical layer port master-slave configuration method and device, communication system.
Background technology
Ethernet (Ethernet) technology is one of technology the most successful in the packet network, and Ethernet will face the demand of multiple business carrying, comprise traditional real time business, language business etc.These business based on traditional time-sharing multiplex (TDM:Time Division Multiplex) still need synchronous support.To need synchronous business in order on Ethernet, supporting better, on Ethernet, to introduce synchronization mechanism.Introduce synchronization mechanism at Ethernet, can realize the synchronous of whole net, allow Ethernet can carry tdm data.Synchronous ethernet (Sync-E:Synchronous Ethernet) can solve the clock synchronization of Ethernet well, allows the Ethernet based on packet switching can carry the TDM business.
Gigabit electricity mouthful (1000Base-T) is a kind of of physical layer port, it is one of the most basic physical layer protocol in the Ethernet, 1000Base-T uses cheap Category-5 twisted pair (Cat5) to realize 100 meters with interior devices interconnect, has very big cost advantage, application in view of introduce synchronous ether on Ethernet is necessary to make 1000Base-T to support synchronous ether.The ethernet physical layer standard of IEEE (IEEE:Institute ofElectrical and Electronic Engineers) issue is since 100,000,000 electricity mouthful version T2 (100BASE-T2), on physical layer equipment, introduce principal and subordinate (Master-Slave) mechanism, be used for better synchronized transmission end and receiving terminal.1000Base-T inherits the Master-Slave principle of 100BASE-T2, to realize the transmission of signal on 100 meters Category-5 twisted pairs of 1000Mbps.Two physical layer equipments that the 1000Base-T link links to each other, one of them must be holotype (MasterPHY), another must be could set up normal communication from pattern (Slave PHY).Therefore, the 1000Base-T port must support the Master-Slave of physical layer to consult, and could guarantee business intercommunication and clock transmission.
Existing a kind of physical layer port master-slave configuration method is the collocation method with reference to the TDM network, promptly adopts the method for manual configuration that clock is configured.Before manual configuration, need with reference to whole clock network, carry out unified planning, for supporting synchronous service, the port of output clock need be arranged to holotype, realize the transmission of clock, simultaneously the port that needs recovered clock is arranged to from pattern, to realize the recovery of clock, when network clocking occurs unusually, when perhaps the synchronizing network topology changes to some extent, need reconfigure to carry out clock and switch.
In research to prior art, the inventor finds: because the port number of Ethernet is huge, and the network topology complexity, and network topology change is frequent, if adopt the Master-Slave relation of the physical layer of all physical layer ports of the whole net of manual configuration, engineer's workload is very big.
Summary of the invention
The embodiment of the invention provides physical layer port master-slave configuration method and device, communication system, and the technical scheme of using the embodiment of the invention to provide can be automatically be configured the principal and subordinate of physical layer port.
The embodiment of the invention provides a kind of physical layer port master-slave configuration method, comprising:
Receive first synchronization clock mass from first physical layer port, described first synchronised clock is sent by second physical layer port that links to each other with described first physical layer port;
Whether the priority of judging described first synchronization clock mass is than the priority height of second synchronization clock mass; Described second synchronization clock mass is the synchronization clock mass in the clock synchronization territory of the network equipment ownership under described first physical layer port;
If the priority height of described second synchronization clock mass of the priority ratio of described first synchronization clock mass, described first physical layer port is set to from pattern; If the priority of described second synchronization clock mass of the priority ratio of described first synchronization clock mass is low, described first physical layer port is set to holotype.
The embodiment of the invention provides a kind of physical layer port principal and subordinate inking device, comprising:
Receiving element is used for receiving first synchronization clock mass from first physical layer port, and described first synchronization clock mass is sent by second physical layer port that links to each other with described first physical layer port;
Whether judging unit, the priority that is used to judge first synchronization clock mass that described receiving element receives be than the priority height of second synchronization clock mass; Described second synchronization clock mass is the synchronization clock mass in the clock synchronization territory of the network equipment ownership under described first physical layer port;
The unit is set, is used for priority in described second synchronization clock mass of priority ratio of described judgment unit judges first synchronization clock mass when high, described first physical layer port is set to from pattern; When the priority of described second synchronization clock mass of priority ratio of described judgment unit judges first synchronization clock mass was low, described first physical layer port was set to holotype.
The embodiment of the invention provides a kind of communication system, comprises the physical layer port principal and subordinate inking device that the embodiment of the invention provides.
The above technical scheme that provides from the embodiment of the invention as can be seen, because the embodiment of the invention can receive first synchronization clock mass, and be provided with according to the priority of the priority of first synchronization clock mass and second synchronization clock mass principal and subordinate to first physical layer port, thereby when being provided with, the principal and subordinate to physical layer port do not need engineer's manual configuration, reduce engineer's workload, can reduce the human cost expenditure.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, to do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below, apparently, accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the flow chart of physical layer port master-slave configuration method embodiment in the embodiment of the invention;
Fig. 2 is the structure chart of physical layer port principal and subordinate inking device embodiment in the embodiment of the invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that is obtained under the creative work prerequisite.
An embodiment of the embodiment of the invention provides physical layer port master-slave configuration method, and Fig. 1 has described the flow process of physical layer port master-slave configuration method embodiment, comprising:
101, receive first synchronization clock mass from first physical layer port; This first synchronization clock mass is sent by second physical layer port that links to each other with first physical layer port.
Because different agreements is to the classification difference of synchronization clock mass, therefore the first kind criteria for classification of synchronization clock mass is that example is described in the G.781 proposed standard of embodiment of the invention employing international telecommunication union telecommunication's standardization group (ITU-T:ITU-T for ITU TelecommunicationStandardization Sector) definition, for other criteria for classification, be equally applicable to the present invention according to the mode of the clock priority sequencing of all kinds of criteria for classifications definition.First synchronization clock mass can be one-level master clock clock quality (QL PRC:Quality of Primary Reference Clock), synchronization supply unit category-A clock quality (QL SSU-A:Quality of Synchronisation Supply Unittype A), synchronization supply unit category-B clock quality (QL SSU-B:Quality of Synchronisation Supply Unit typeB), in Synchronous Digital Hierarchy equipment clock quality (QL SEC:Quality of SDH Equipment Clock) and the unavailable clock quality (QL DNU:Quality of Do not use) any one; First synchronization clock mass is the synchronization clock mass in the synchronised clock territory of second network equipment ownership under second physical layer port.
Wherein, according to the difference of network, first synchronization clock mass is also different; For example in common synchronous ethernet, first synchronization clock mass can be Synchronization Status Message (SSM:Synchronous StatusMessage); In the Sync-E that has realized ether synchronizing information passage (ESMC:Sync-E SSM message Channel), first synchronization clock mass can be Ethernet Synchronization Status Message (ESSM:EthernetSynchronous Status Message), transmission and processing that ESSM can adopt the tissue definition slow protocol (OSSP:Organization Specific Slow Protocol) of IEEE 802.3 definition to carry out.
In an embodiment of the embodiment of the invention, first physical layer port and second physical layer port can be the 1000Base-T ports.
102, whether the priority of judging first synchronization clock mass is than the priority height of second synchronization clock mass; If enter 103; If not, enter 104.
Wherein second synchronization clock mass is the synchronization clock mass in the clock synchronization territory of first network equipment ownership under first physical layer port, can be among QL PRC, QL SSU-A, QL SSU-B, QL SEC and the QL DNU any one.Particularly, can obtain second synchronization clock mass by the another port of first network equipment setting, this another port can be physical layer port (as the 1000Base-T port), also can be port or the special-purpose clock interface of supporting other physical layer protocol, as supporting TDM service port, special-purpose Building Integrated Timing Supply (BITS:Building Integrated Timing Supply) port etc.; When the synchronization clock mass in the clock synchronization territory of the current ownership of this network equipment was unknowable, second synchronization clock mass was that synchronised clock is unavailable, is specifically as follows QL DNU.
If the priority of first synchronization clock mass is identical with the priority of second synchronization clock mass, can be not the principal and subordinate of first physical layer port be provided with.
The priority of synchronization clock mass can set in advance, and in an embodiment of the embodiment of the invention, the priority of different clocks is by as follows to low order from height: QL PRC; QL SSU-A; QL SSU-B; QL SEC; QL DNU; Obtain the clock quality (QL INV) of failure; Unknown clock quality (Unknown).In an embodiment of the embodiment of the invention, the priority of QL DNU and QL INV and Unknown can be identical.
103, first physical layer port is set to from pattern; Process ends.
If the priority height of priority ratio second synchronization clock mass of first synchronization clock mass, explanation receive from first physical layer port clock the synchronised clock territory that is superior to first network equipment ownership the rank of clock, first physical layer port must be forced to be arranged to from pattern, thereby from the first physical layer port recovered clock.
104, first physical layer port is set to holotype; Process ends.
If the priority of priority ratio second synchronization clock mass of first synchronization clock mass is low, the rank that explanation receives clock from first physical layer port be lower than first network equipment ownership the synchronised clock territory the rank of clock, first physical layer port can be arranged to holotype.
From the above, present embodiment can receive first synchronization clock mass, and be provided with according to the priority of the priority of first synchronization clock mass and second synchronization clock mass principal and subordinate to first physical layer port, thereby when being provided with, the principal and subordinate to physical layer port do not need engineer's manual configuration, reduce engineer's workload, can reduce the human cost expenditure.
In the physical layer port master-slave configuration method that an embodiment of the embodiment of the invention provides, be provided with in order to ensure principal and subordinate second physical layer port, be set to from pattern at first physical layer port, or first before physical layer port is set to holotype, can also send second synchronization clock mass by first physical layer port, so that second network equipment under second physical layer port can be provided with according to the principal and subordinate of second synchronization clock mass to second physical layer port, thereby guarantee that first physical layer port can normally communicate by letter with second physical layer port.
In the physical layer port master-slave configuration method that an embodiment of the embodiment of the invention provides, first physical layer port is set to after pattern, it is unavailable to send synchronised clock by first physical layer port, it is unavailable that second physical layer port that links to each other with first physical layer port can receive synchronised clock, and second physical layer port can be known can not be selected from the clock of first physical layer port.
In the physical layer port master-slave configuration method that an embodiment of the embodiment of the invention provides, after first physical layer port is set to holotype, can also send second synchronization clock mass by first physical layer port, second physical layer port that links to each other with first physical layer port can receive second synchronization clock mass, and second physical layer port can be carried out local clock according to second synchronization clock mass synchronously.
Followingly the physical layer port master-slave configuration method that an embodiment of the embodiment of the invention provides is described for instantiation:
The network equipment 1 (NE-1) and the network equipment 2 (NE-2) of supporting synchronous Ethernet clock are arranged, and wherein, NE-1 is linked among the S1 of clock synchronization territory by port A, the S1 territory has been QL PRC for clock quality synchronously, QL SSU-A, QL SSU-B, a kind of among QL SEC and the QL DNU; NE-2 is linked among the S2 of clock synchronization territory by port C, and the S2 territory is also synchronously for clock quality is QL PRC, QLSSU-A, QL SSU-B, a kind of among QL SEC and the QL DNU.
S1 belongs to different clock synchronization territories with S2, and promptly the clock synchronization quality in the synchronization clock mass in S1 territory and S2 territory is unequal, has the link of a physical layer to link to each other between two network equipments, and this link connects the B port of NE-1 and the D port of NE-2.Interconnected between NE-1 and the NE-2 can be initiate, is not activated Sync-E ether function before also can being, this function is enabled in configuration afterwards.Link between NE-1 and the NE-2 not only will carry out common data passes, also needs to transmit synchronously, and is synchronous with network enabled.
Because B port and D port all are physical layer ports, before carrying out the transmission of general data transmission and synchronised clock, need carry out correct physical layer Master-Slave and be provided with.NE-1 and NE-2 insert the synchronization field of S1 and S2 respectively, and therefore two equipment are synchronized to corresponding synchronization field respectively.The Synchronization Status Message that the A port of NE-1 receives from synchronization field is S1, avoid occurring clock loop, the synchronizing information that the A port sends it back the S1 synchronization field is QL DNU, the clock of representing this direction can not be selected, the A port is as the port of recovered clock, and promptly the synchronised clock of NE-1 is from this port, and the A port may be a physical layer port, also may support the port or the special-purpose clock interface of other physical layer protocol, as supporting TDM service port, special-purpose BITS mouth etc.The Synchronization Status Message that the C port of NE-2 receives from synchronization field is S2, avoids occurring clock loop simultaneously, and the synchronizing information that port C sends is QL DNU, and the C port is as the port of recovered clock.
When B port and D port use physical layer protocol interconnected, the Master-Slave state of B port and two interconnect port of D port need be set.The clock signal quality of assumes synchronization territory S1 is better than the clock quality of clock synchronization territory S2, uses S1〉S2 represents.When the B port is connected with the D port, can adopt the mode of automatic negotiation earlier, guarantee that data at first can proper communication, promptly between B port and D port, connect earlier, allow the message that carries SSM information can be delivered to the opposite end, so that the principal and subordinate of B port and D port is provided with.
NE-1 by the B port with NE-1 synchronous clock zone clock status information S1 issue opposite end D port, NE-2 by the D port with NE-1 the state information of synchronous clock zone S2 send to opposite end B port.This moment, NE-1 and NE-2 can both be known two clock zones, and the priority of the synchronization clock mass of two clock zones is inconsistent, can start to select source simultaneous operation again.
Receiving two synchronization clock mass for NE-1:NE-1, is S1 from the synchronization clock mass of A port, is S2 from the synchronization clock mass of B port, because the priority of S1 is higher than S2, NE-1 continues to be synchronized on the S1.Because the S1 by the S2 of B port reception is lower than transmission is arranged to holotype with the B port.
Receive two synchronization clock mass for NE-2:NE-2, from the S2 of C port with from the S1 of D port, because the priority of S1 is higher than S2, NE-2 is synchronized on the clock S1 of D port.Because the clock stratum S1 that the D port receives is higher than the clock S2 of transmission, and the D port is arranged to from pattern; Guarantee recovered clock, avoid clock loop.Because NE-2 traces into the clock source of D port, the clock source level that the D port sends is QL DNU.For NE-2, the clock source of its tracking changes to S1 by S2, and the clock stratum that the port C that then links to each other with clock zone S2 sends need change to the clock source S1 that is followed the tracks of.
From the above, in the physical layer port master-slave configuration method that the embodiment of the invention provides, for supporting Sync-E, and need to participate in selecting the physical layer port in source, the Master-Slave relation of this port physical layer is judged by the SSM rank that software receives and sends according to this physical layer port, if the SSM that receives is superior to the SSM rank of transmission, explanation need be arranged to the physical layer equipment of this port from physical layer equipment (Slave-PHY) from this port recovered clock; If the SSM rank that receives is lower than the SSM rank of transmission, illustrate that the opposite end need be arranged to primary physical layer equipment (Master-PHY) with the physical layer equipment of this port from this port recovered clock.When the SSM rank of SSM rank that receives and transmission is identical, illustrate that the network equipment at two ends has traced into the source of same level, if switch in not generation source, Master-Slave is not provided with so, the business of assurance at this moment can get final product in proper communication; If originally the variation of the source generation of equipment tracking selects the source to working as front port again, the SSM rank of its transmission changes automatically, and this moment, port concerned according to top SSM rank equipment Master-Slave again.
An embodiment of the embodiment of the invention provides the physical layer port principal and subordinate inking device, and Fig. 2 has described the structure of physical layer port principal and subordinate inking device embodiment, comprising:
Receiving element 201 is used for receiving first synchronization clock mass from first physical layer port, and this first synchronization clock mass is sent by second physical layer port that links to each other with first physical layer port;
Whether judging unit 202, the priority that is used to judge first synchronization clock mass that receiving element 201 receives be than the priority height of second synchronization clock mass; Wherein, second synchronization clock mass is the synchronization clock mass in the clock synchronization territory of the network equipment ownership under first physical layer port;
From the above, the present embodiment of physical layer port principal and subordinate inking device can receive first synchronization clock mass, and be provided with according to the priority of the priority of first synchronization clock mass and second synchronization clock mass principal and subordinate to first physical layer port, thereby when being provided with, the principal and subordinate to physical layer port do not need engineer's manual configuration, reduce engineer's workload, can reduce the human cost expenditure.
Further, in an embodiment of the embodiment of the invention, physical layer port principal and subordinate inking device can also comprise:
Transmitting element 204 is used for sending second synchronization clock mass by first physical layer port before unit 203 first physical layer ports are set are set to be set to holotype from pattern or first physical layer port.Second network equipment of second physical layer port ownership can be provided with according to the principal and subordinate of second synchronization clock mass to second physical layer port, thereby guarantee that first physical layer port can normally communicate by letter with second physical layer port.
Further, in an embodiment of the embodiment of the invention, physical layer port principal and subordinate inking device can also comprise: transmitting element 204, be used for when unit 203 first physical layer ports being set being set to from pattern, send DNU by first physical layer port, second physical layer port that links to each other with first physical layer port can receive DNU, and second physical layer port can be known can not be selected from the clock of first physical layer port; When unit 203 first physical layer ports being set being set to, send second synchronization clock mass by first physical layer port from pattern.Second physical layer port that links to each other with first physical layer port can receive DNU, second physical layer port can be known can not be selected from the clock of first physical layer port, second physical layer port that links to each other with first physical layer port can receive DNU, and second physical layer port can be carried out local clock according to second synchronization clock mass synchronously.
An embodiment of the embodiment of the invention also provides communication system, this communication system comprise that the embodiment of the invention provides physical layer port principal and subordinate inking device.
One of ordinary skill in the art will appreciate that all or part of flow process that realizes in the foregoing description method, be to instruct relevant hardware to finish by computer program, described program can be stored in the computer read/write memory medium, this program can comprise the flow process as the embodiment of above-mentioned each side method when carrying out.Wherein, described storage medium can be magnetic disc, CD, read-only storage memory body (Read-OnlyMemory, ROM) or at random store memory body (Random Access Memory, RAM) etc.
More than physical layer port master-slave configuration method that the embodiment of the invention provided and device, communication system are described in detail, the explanation of above embodiment just is used for helping to understand method of the present invention and thought thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present invention, the part that all can change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.
Claims (9)
1, a kind of physical layer port master-slave configuration method is characterized in that, comprising:
Receive first synchronization clock mass from first physical layer port, described first synchronised clock is sent by second physical layer port that links to each other with described first physical layer port;
Whether the priority of judging described first synchronization clock mass is than the priority height of second synchronization clock mass; Described second synchronization clock mass is the synchronization clock mass in the clock synchronization territory of the network equipment ownership under described first physical layer port;
If the priority height of described second synchronization clock mass of the priority ratio of described first synchronization clock mass, described first physical layer port is set to from pattern; If the priority of described second synchronization clock mass of the priority ratio of described first synchronization clock mass is low, described first physical layer port is set to holotype.
2, physical layer port master-slave configuration method as claimed in claim 1 is characterized in that, before described first physical layer port was set to be set to holotype from pattern or described first physical layer port, this method also comprised:
Send described second synchronization clock mass by described first physical layer port, so that the network equipment under described second physical layer port carries out principal and subordinate's configuration according to described second synchronization clock mass to described second physical layer port.
3, physical layer port master-slave configuration method as claimed in claim 1 is characterized in that, described second synchronization clock mass obtains in the following way:
Another port by the network equipment setting under described first physical layer port obtains described second synchronization clock mass;
Or
When the synchronous regime in the clock synchronization territory of the network equipment ownership under described first physical layer port was unknowable, it is unavailable that described second synchronization clock mass is set to synchronised clock.
4, physical layer port master-slave configuration method as claimed in claim 1 or 2 is characterized in that, described first physical layer port is set to after pattern, and this method also comprises:
It is unavailable to send synchronised clock by described first physical layer port;
Or
After described first physical layer port was set to holotype, this method also comprised:
Send second synchronization clock mass by described first physical layer port, so that described second physical layer port carries out clock synchronization according to described second clock quality.
5, physical layer port master-slave configuration method as claimed in claim 1 or 2 is characterized in that, described first synchronization clock mass is a Synchronization Status Message;
Or described first synchronization clock mass is the Ethernet Synchronization Status Message.
6, a kind of physical layer port principal and subordinate inking device is characterized in that, comprising:
Receiving element is used for receiving first synchronization clock mass from first physical layer port, and described first synchronization clock mass is sent by second physical layer port that links to each other with described first physical layer port;
Whether judging unit, the priority that is used to judge first synchronization clock mass that described receiving element receives be than the priority height of second synchronization clock mass; Described second synchronization clock mass is the synchronization clock mass in the clock synchronization territory of the network equipment ownership under described first physical layer port;
The unit is set, is used for priority in described second synchronization clock mass of priority ratio of described judgment unit judges first synchronization clock mass when high, described first physical layer port is set to from pattern; When the priority of described second synchronization clock mass of priority ratio of described judgment unit judges first synchronization clock mass was low, described first physical layer port was set to holotype.
7, physical layer port principal and subordinate inking device as claimed in claim 6 is characterized in that, also comprises:
Transmitting element, be used for described described first physical layer port in unit be set be set to be set to holotype from pattern or described first physical layer port before, send described second synchronization clock mass by described first physical layer port, so that the network equipment under described second physical layer port carries out principal and subordinate's configuration according to described second synchronization clock mass to described second physical layer port.
8, physical layer port principal and subordinate inking device as claimed in claim 6 is characterized in that, also comprises:
Transmitting element is used for described when described first physical layer port in unit being set being set to from pattern, and it is unavailable to send synchronised clock by described first physical layer port; When described first physical layer port in unit being set being set to, send second synchronization clock mass by described first physical layer port, described so that described second physical layer port carries out clock synchronization according to described second clock quality from pattern.
9, a kind of communication system is characterized in that, comprises as the arbitrary described physical layer port principal and subordinate inking device of claim 6 to 8.
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| CN102158412A (en) * | 2011-04-08 | 2011-08-17 | 中兴通讯股份有限公司 | Transmission method and system of synchronous state information in Ethernet synchronization |
| CN102208958A (en) * | 2011-07-04 | 2011-10-05 | 瑞斯康达科技发展股份有限公司 | Clock synchronization method for synchronous Ethernets, as well as synchronous information sending/receiving method, device and apparatus |
| CN102237940A (en) * | 2010-05-04 | 2011-11-09 | 华为技术有限公司 | Method, system and device for transferring sync-status message (SSM) in passive optical network |
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| CN102208958A (en) * | 2011-07-04 | 2011-10-05 | 瑞斯康达科技发展股份有限公司 | Clock synchronization method for synchronous Ethernets, as well as synchronous information sending/receiving method, device and apparatus |
| CN102208958B (en) * | 2011-07-04 | 2012-12-19 | 瑞斯康达科技发展股份有限公司 | Clock synchronization method for synchronous Ethernets, as well as synchronous information sending/receiving method, device and apparatus |
| CN102946291A (en) * | 2012-11-12 | 2013-02-27 | 华为技术有限公司 | Clock maintaining method and clock equipment |
| CN105791006A (en) * | 2016-02-26 | 2016-07-20 | 上海富欣智能交通控制有限公司 | Dual-computer hot standby system and communication method thereof |
| CN109787325A (en) * | 2017-04-07 | 2019-05-21 | Oppo广东移动通信有限公司 | Wireless charging system, device, method and charging equipment |
| CN109787325B (en) * | 2017-04-07 | 2023-06-27 | Oppo广东移动通信有限公司 | Wireless charging system, device and method and equipment to be charged |
| CN112865899A (en) * | 2019-11-26 | 2021-05-28 | 华为技术有限公司 | Method and device for adjusting physical layer (PHY) master-slave mode |
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