CN1269654A - Method for synchronising network apparatus in networks - Google Patents
Method for synchronising network apparatus in networks Download PDFInfo
- Publication number
- CN1269654A CN1269654A CN 00108610 CN00108610A CN1269654A CN 1269654 A CN1269654 A CN 1269654A CN 00108610 CN00108610 CN 00108610 CN 00108610 A CN00108610 A CN 00108610A CN 1269654 A CN1269654 A CN 1269654A
- Authority
- CN
- China
- Prior art keywords
- network equipment
- network
- clap
- time
- source
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 28
- 230000005540 biological transmission Effects 0.000 claims abstract description 23
- 230000001360 synchronised effect Effects 0.000 claims description 27
- 238000004891 communication Methods 0.000 claims description 2
- 230000002265 prevention Effects 0.000 claims description 2
- 230000007704 transition Effects 0.000 claims 2
- 239000003550 marker Substances 0.000 abstract 3
- 230000008569 process Effects 0.000 description 5
- 230000008901 benefit Effects 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 230000008676 import Effects 0.000 description 3
- 238000012546 transfer Methods 0.000 description 3
- 230000035559 beat frequency Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 238000010009 beating Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000004069 differentiation Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 230000006855 networking Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 238000012857 repacking Methods 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/06—Synchronising arrangements
- H04J3/0635—Clock or time synchronisation in a network
- H04J3/0679—Clock or time synchronisation in a network by determining clock distribution path in a network
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J2203/00—Aspects of optical multiplex systems other than those covered by H04J14/05 and H04J14/07
- H04J2203/0001—Provisions for broadband connections in integrated services digital network using frames of the Optical Transport Network [OTN] or using synchronous transfer mode [STM], e.g. SONET, SDH
- H04J2203/0089—Multiplexing, e.g. coding, scrambling, SONET
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/06—Synchronising arrangements
- H04J3/0635—Clock or time synchronisation in a network
- H04J3/0638—Clock or time synchronisation among nodes; Internode synchronisation
- H04J3/0647—Synchronisation among TDM nodes
Abstract
The method involves providing an identifier for identifying a first clock source (T3(Q1)) by a clock master of a first network element (NE A). The first network element is connected to the first clock source. A timing marker is sent from the first network element to other network elements (NE B,..,NE X), which are connected to the first network element. The identifier is stored in at least one of the elements in the rings formed from the network elements. When the first clock source fails, circulation of the timing marker in the connected network elements is prevented by comparing the received identifier with the stored identifier. When the identifiers are in conformance, the first clock sequence and the corresponding transmission signal are not used for synchronisation of the network elements. The synchronisation of the network elements is carried out by a further clock source (T3(Q2) and by a timing marker allocated to the clock source. An identifier is allocated to the further clock source by a clock master of a network element, which is connected to the further clock source.
Description
The basis of synchronous digital hierarchy (SDH) technology is the data synchronization transmission.This means each network equipment, beat frequency only allows minimum deviation during as the transmitting and receiving of synchronous multiplexer.The time deviation of clapping can cause bit offset and/or vertical shift, and reliability and zero defect that can't the guarantee information transmission.
In the transmission network of complexity, should realize clapping when the most reliable with the shortest path and distribute.In addition, clap the alternative route provide in the time of under the condition of network failure, also must setting up, and clap closed loop must not produce the time.
In large-scale and complicated transmission network, planning synchronously is difficulty and expensive very, because bat closed loop all must detection whether can produce all alternative routes the time.In case this alternative route can't use, then the quality of Network Synchronization will be restricted.
Task of the present invention is to be provided in the synchronous digital hierarchy network network equipment is carried out synchronous another kind of method.
The solution of above task is embodied in the feature of claim 1.This scheme is a kind of and network, the method for synchronous of the network equipment that connects of communication network particularly, wherein at least one first network equipment links to each other with first o'clock bat source, and from described first network equipment, send a markers to other network equipments that link to each other with described first network equipment, and described other network equipments also can interconnect, feature of the present invention is, clap the source for discerning at described first o'clock, by described first network equipment the time clap base station and give a mark, and in the ring that constitutes by the described network equipment, the described mark of storage at least one described network equipment, when described when lost efficacy in the bat source first the time, the markers circulation that exists in the network equipment that described annular connects can prevent the comparison of signal that is received and the signal of being stored, under the situation of unanimity, clap source and affiliated transmission signals at described first o'clock and be not used in the synchronous of the network equipment, and the time clap the described network equipment in source synchronously by another the time bat source links to each other when clapping source and one with this network equipment carry out, wherein said another the time clap the source network equipment that the bat source links to each other by with this time time bat base station distribute to a mark.
The advantage that the present invention brought is, can avoid forming the markers of rotation, thus the exchange that the continuation of avoiding being brought is present in the network equipment of subnet or loop switch, have bigger envelop of function simultaneously.
What the present invention brought is also advantageous in that, can carry out simple planning synchronously.
What the present invention brought is also advantageous in that, claps closed loop in the time of can preventing to produce.
What the present invention brought is also advantageous in that, claps the reliability that supply realizes network when reliable.
What the present invention brought is also advantageous in that, by markers being expanded to a univocality mark of the network equipment, thereby make the network equipment can to network delivery with reference to the time clap, and can realize the automation of inaccessible sample definition, this function is effective to the whole network, and can improve quality, stability and the reliability of SDH transmission network greatly.In addition, this time clap sample and can restore and clap during conduction from its port with this.
Other characteristics embody in the dependent claims.Contrast embodiment shown in the drawings is described in detail this method below.
Fig. 1 represent according to the MS master-slave method the time clap distribution condition,
Fig. 2 claps when representing to define in the network equipment,
Fig. 3 represents the markers distribution,
Fig. 4 represents unconfined priority assignment,
When representing one, claps Fig. 5 the effect of closed loop,
When representing to avoid, claps Fig. 6 closed loop,
When representing not have, claps Fig. 7 the unconfined priority assignment of closed loop,
Fig. 8 is illustrated in the situation of using inaccessible sample in the complex network.
Below the described prior art of Fig. 1 to Fig. 6 is illustrated, and points out the shortcoming of its existence.
What Fig. 1 represented is the part of a transmission network, and data are wherein transmitted according to synchronous digital hierarchy SDH.This transmission network for example comprises network equipment NE1, NE2 and NE3.In this transmission network, realize be layering the time clap distribution principle.Clap distribution principle during according to this, clapping the base station network equipment in the time of one presents to a few position of network and claps when high-precision, and from this base station, utilize institute's data signals transmitted as a rule, continue to divide timing to clap to other network equipments.By the time reception of clapping, clap when the described network equipment produces one from data-signal, and clap during according to the MS master-slave method and to carry out synchronously its built-in system.Network equipment NE1 shown in Figure 1 has one and claps when central.Be connected with data between network equipment NE2 and the network equipment NE3 through network equipment NE1, network equipment NE2 and network equipment NE3 can by to from the signal of network equipment NE1 the time clap and restore, clap when obtaining its system.When interference occurring and interrupting, must provide relative measures with the form of synchronous alternative route.For example when the connection between network equipment NE1 and the network equipment NE2 is interrupted, network equipment NE2 can't obtain data-signal from network equipment NE1, clap in the time of therefore can not guiding.A kind of scheme of selection is, claps when network equipment NE3 obtains, and claps quality when being used to provide use good from network equipment NE1 because network equipment NE3 has.
The network equipment shown in Fig. 2 has claps input port T1, T2 and T3 when a plurality of.Clap input when realizing such as the outside, function such as switchings when occurring disturbing, synchronous digital hierarchy SDH has bat when undefined as the network equipment of multiplexer:
T0: clap during built-in system, clap when utilizing this under the normal condition all data-signals that send are carried out synchronously.
T1: a SDH data-signal, therefrom can with the time clap recovery.
T2: a PDH data-signal, therefrom can with the time clap recovery.
T3: clap input when outside, clap when being used to import a high accuracy.
T4: clap output when outside, it can be clapped when other equipment provides system.
Be to realize control, promptly obtain the bat source when possible from it certain network equipment system the time clap, mainly should define two kinds of standards shown in Figure 3:
By priority such as P1, the standard of P2...... definition and
By the time clap quality as " 2 ", i.e. the standard of quality 1 definition.
By giving priority such as P1, P2...... can determine which source when outside (clap input, the SDH/PDH signal of being received) claps when allowing to be used to obtain, and when a plurality of sources have when equal the bat quality, with which kind of this source that uses in order.According to prior art, check that all have been endowed the source of priority, and use source, thereby and clap T0 during system and realize synchronously with best quality and limit priority.If lost efficacy in certain time bat source of using, then switch to the next one have best quality and limit priority the time clap the source.If the source of clapping when having the outside can be for domination, then internal oscillator must free-running operation, and beating-in step when can not be by one better.
The time clap quality can be by " markers " (being positioned at the S1 bit of STM-N data-signal top layer) transmission through the SDH interface, and by the time bat make a quality explanation.The time clap from the outside, promptly through the time clap on the network site of input T3 or the input of PDH source, that is to say does not have markers on the position that the STM-N signal continues to arrive on this position, must to the time clap quality and define respectively.The markers bit can be taked following numerical value:
| Quality | Code | Implication |
| Q1 | ?x2 | A reference clock (clapping quality during the best) |
| Q2 | ?x4 | Secondary reference clock transmission when good (second clap quality) |
| Q3 | ?x8 | Secondary reference clock this locality when good (the 3rd clap quality) |
| Q4 | ?xB | Clap generator free-running operation (" transfer " or " free-running operation ") when expression is inner |
| Q5 | ?x0 | Quality the unknown (be used in the time of two between the bat source in the time of handoff procedure) |
| Q6 | ?xF | " be not used in synchronously " (this time the source of clapping to be used for system the time beating-in step) |
" x ": the unused bytes 1 to 4 of S1 bit
In Fig. 3, provided the markers numerical value of corresponding network device.In network shown in Figure 3, clap when outside and enter network equipment NE1, and have markers " 2 " from input T3, promptly have best quality.Described markers continues to be transferred to network equipment NE2 and network equipment NE3 with the SDH data-signal.Because network equipment NE2 and NE3 are synchronous with network equipment NE1, thus they automatically on oppositely (to NE1) insert numerical value " F ", make network equipment NE1 on this direction can not as the time bat source use.The same transmission markers " 2 " that continues between network equipment NE2 and NE3.Because neither one is synchronous in this is connected among these two network equipment NE2 and the NE3, so on oppositely, do not insert markers.When confirming priority, must be noted that, clap closed loop in the time of must not producing.The time clap the condition that closed loop produces, for example the priority that in a network equipment ring, is provided with make should not exist the time be marked in the network and rotate.
Shown in Figure 4 be one has the example that unlimited priority is given the network of power.In this network, network equipment NE A to NE F is wherein connecting another subnet by a loop configuration interconnection on network equipment NE A.Synchronously from the time clap base station NE A, carry out through NE B and NE C clockwise direction NE D, and from the time clap base station NE A, carry out to NE E inhour through NE F.It seems that the giving of priority distribute by best mode.So when line interruption, no matter interrupt occurring on what position, all NE by the time clap and to clap Q1 when base station NE A provides.
When for example between NE A and NE B, occurring interrupting, will produce following situation:
NE B no longer claps when NE A obtains, and NE B obtains a markers " F " from NE C, claps NE B when that is to say this and does not allow to use.So NE B enters " transfer " pattern, send markers " B ", and with the quartzy generator work in inside.
NE C obtains markers " B " from NE B, obtains markers " F " from NE D.The beating-in step when this means NE C and relatively poor NE B.
NE D no longer obtains markers " 2 " from NE C, but obtains " B ".But NE E continues to provide " 2 ".So clap source NEE when NED switches to, and continue to send markers " 2 " to NEC.
NE C switches to priority 2, because what obtain from NE D this moment is markers " 2 ".
This moment, NE B also obtained markers " 2 " from NE C, and switched to priority 2.
Whole network is synchronous counterclockwise in the above described manner, although line interruption occurred, all-network equipment all can obtain to have time bat, the i.e. markers " 2 " of quality 1.
The shortcoming that this program of the network equipment is brought is, claps closed loop in the time of may producing one, and it can cause unstable networks.So will be limited giving of priority in practice.But its consequence is, under failure condition the not all network equipment can both be in the best way when alternative the bat source be connected or obtain alternative route.
The program of the network equipment is clapped externally the time under the malfunctioning situation of source Q1 and will no longer be worked.From situation shown in Figure 4, and transfer to identical switching time under the condition of another synchronisation source satisfying all-network equipment, will produce following process:
The time when clapping T3 and makeing mistakes, the network equipment is to be in " delivering " pattern, receives markers " F " then on the port with priority 2 and 3.
Network equipment NE B and NE F clap when taking over the system of network equipment NE A in second step.
In the 3rd step, network equipment NE C take over network equipment NE B the time clap, and should the time clap and continue to be transferred to network equipment NE D.Simultaneously network equipment NE E have through network equipment NE F obtain on the port of priority P 1 network equipment NE A the time clap, and on port, obtain markers " 2 " with priority P 2.So network equipment NE E will switch to priority P 2 this moment, clap during adapter, and continue to send markers " 2 " to network equipment NE F.
This moment, network equipment NE D clapped when network equipment NE C obtains the system of network equipment NE A, and obtained markers " F " from network equipment NE E because network equipment NE E taken over network equipment NE D the time clap.So network equipment NE D must take over the time bat of network equipment NE C.
At one time, network equipment NE F takes over the quality Q 1 of NE E, and continues it is transferred to NE A.
Above process is carried out automatically.This means that this moment, this markers " 2 " that should not be present in the network continued transmission.This will cause markers " 2 " vibration, and markers " B " (the inside quartz (controlled) oscillator of NE A) is transmitted in network clockwise.Can't illustrate this moment in the network the time clap the situation of quality.To continue to trigger handoff procedure among these external all NE.Can carry out clapping when synchronous the base station (see figure 5) that will not exist to whole network.Its reason is, formed clap when one clockwise closed loop and one counterclockwise the time clap closed loop.In time, claps closed loop and means the self-operating ring that has a feedback, and there is bigger deviation all the time in the beat frequency instability at that time, and it can only be by the limiting frequency qualification of inner PLL ' s (phase-locked loop circuit).If given other priority on the port of NE, also counterclockwise rotation can appear.Up to now, the method for clapping the closed loop problem when solve constituting is, loaded the network equipment of clapping when outside and can not obtain priority on other ports.So the time clap closed loop ring be cut off, markers " 2 " can not be rotated in network.Its shortcoming is to clap the source when network equipment NE A will not substitute and can arrange.This shortcoming shows obviously especially in following example, promptly in network, often exist one second with reference to the time clap the source, and consider on network equipment NE A then another complete subnet, it is clapped when NE A obtains.
Shown in Figure 6 is use in practice at present avoid occurring the time clap the scheme of closed loop.Clap source Q1 when among the network equipment NE A when malfunctioning, final synchronizing process is as follows:
The time to clap base station be network equipment NE C, clap quality Q 2 when it has, that is to say to have markers " 4 ", and network equipment NE B carried out synchronously that the while also carries out NE F through NE D, NE E synchronously.Network equipment NE A and the whole subnet that is connected on the network equipment NE A can not receive this good time bat.That is to say that clap Q2 although have when good, network equipment NE A also must operate under " maintenances " pattern, and the subnet that is connected clap must be by its inside inferior crystal oscillator the time carry out synchronous.This example has shown the shortcoming that simple priority is given, promptly must apply restriction (the time clap in the base station do not have priority), enter rotation to stop markers.
Adopt the method for the invention not only can capture vibration with processing time scales, and reason can be got rid of, thereby target recycles existing when not allowing.Existing up to now problem is, from network equipment NE A shown in Figure 5 send the time be marked under the situation that network breaks down and can produce rotation, it can reenter another port of the same network equipment, and with the mode of mistake as the time bat source carry out synchronously.The situation that must stop is, clap the markers that the network equipment oneself of base station function sent when having and received by another port once more, and clap when being used to self system synchronous.Because in a network, can repeatedly import fully in principle and clap quality when same, Q1 for example, and according to markers of the present invention if from other with reference to the time bat source send, then can not cause obstruction to network equipment NE A.
According to the present invention, utilization can be that the markers of adding can be given mark clearly, utilizes it can calculate whether a markers that receives through the STM-N signal is exactly from equipment itself.If conclusion is sure, just then should the time source of clapping clap when being not used in system own synchronously.Must use the markers that as far as possible has equal in quality that other equipment send in the network this moment.This clear and definite mark is clapped the place of quality in the time of must inserting all and define for the first time.So just, be marked on rotation in the network in the time of can preventing, possibility also is provided simultaneously, make all of the port, the port of clapping base station when comprising is incorporated into the program of synchronisation source.Clapping the supply layering during as shown in Figure 1 rigidity no longer needs.
The starting point of example shown in Figure 6 is the priority of adding on other ports of NEA.
In structure shown in Figure 7, for being determined, identification claps the source when synchronous, give an one mark.The quality of clapping when this mark can be or one with the time bat source network equipment that interrelates apparatus characteristic.Represent the source of clapping when described the time clap quality or quality markers can be independent, perhaps be used from the generation of clapping closed loop when stoping with network equipment feature one.Clap the generation of closed loop when it is contemplated that independent use network equipment feature with prevention.
A kind of scheme that provides in the following description is, according to of the present invention, and when clapping source T3 when first and losing efficacy, the process that in network equipment NE A, takes place:
When not reentrying, claps the network equipment NE A T3.To receive markers " F " on its port, network equipment NE A enters " maintenance " pattern.
When using this at short notice, claps the adjacent network equipment.Network equipment NE C on port, obtain one clap when outside the input difference the time clap, and switch to the next one have Q2 the time clap source T3.Markers " 4 " continues to be transferred to the adjacent network equipment through port.
The network equipment adjacent with network equipment NE C obtains markers " 4 " from network equipment NE C, and claps the source when switching to this.
The network equipment that does not have directly to link to each other with network equipment NE C also will be received markers " 4 " over time, and clap the source when using this.Having a network equipment at least, is the consistency that the network equipment NE A that claps the base station function when having detects received markers or received mark and the mark of being stored in example, and bat source when only just using this under inconsistent situation.
Final situation about producing is seen shown in Figure 7, claps the role of base station when promptly network equipment NE C takes over, and with the best that can arrange in the network other the time bat whole network is carried out synchronously.The network that links to each other with network equipment NE A can obtain this equally and clap when the second best in quality.
Clap during reference in network equipment NE C under the situation identical in quality of the quality in source and network equipment NE A (markers " 2 "), will carry out identical process.Clapping input when this means this can be when interference occurs clap during with this whole network and carries out synchronously.To the analysis of mark can prevent a SDH port itself the time clap and take over, so target rotation can therefore in network, not cause the time.
The above shows, if clap T3 when not existing on the network equipment NE C in the example of Fig. 7, and T3 lost efficacy on network equipment NE A, and then the markers " 2 " on the NE A will be defined, and be endowed mark " x ", can not rotate in network.If this markers with mark " x " arrives at from the SDH port of NE A to NE B and NE F, the detection that then receives mark " x " will obtain the consistency with network equipment mark, so do not use it for synchronously.So just, can get rid of the possibility of taking over and continuing transmission or rotation.
What Fig. 8 represented is an overall network structure, and it can be by the synchronous planning and the configuration of the network equipment of the present invention, and it is synchronous that this transmission network is carried out fault-free.The starting point of this situation is, time claps source T3 (1) the ring A of network equipment NE1 to NE4 is carried out synchronously, and the time bat source T3 (2) the ring B of network equipment NE5 to NE8 is carried out synchronously.When clap losing efficacy when the outside, markers can not be rotated, and can identify mark " x " among the NE1 and the mark " y " among the NE6 because clap base station network equipment NE1, NE6 when corresponding, makes their port that belongs to corresponding closed loop not be used in synchronous purpose.
If the connection between two subnets uses network equipment NE3 and network equipment NE5 as the synchronisation source on the both direction, then the situation of this network will change.For example, if the time clap source T3 (2) and lost efficacy, then be arranged in the ring B the network equipment also will from the time clap source T3 (1) and obtain signal.If the additional hours between this moment two rings is clapped to provide be interfered, then the markers of rotation will in ring B, occur.Its reason is, according to described basic conception up to now, the network equipment particularly NE5 can only be to itself mark of the markers check of receiving, and under the situation of unanimity, not should the time bat source be used for synchronously.This means that in this example mark " x " is inserted by network equipment NE1, the network equipment in the ring B can not confirm and itself mark between consistency, and NE5 claps the source when allowing to use this when receiving this mark.Will make the markers rotation that exists in the ring B by this way with mark " x ".Rotation can be avoided by so-called " inaccessible sample ", and this obturation sample is defined in the network equipment.The task of this obturation sample is a timestamp when particular port receives, and its mark with storage is compared, and the time do not accept or continue to transmit this markers when unanimity.So the task that its is carried out with the time clap the identical of base station, can prevent in the network the time clap closed loop.With reference to embodiment shown in Figure 8, this means, in ring B network equipment NE5 or ring B the time clap input equipment stored mark or inaccessible sample " x ".To the port of network equipment NE6 and NE8, will can not accept to have the markers of mark " x " at NE5 like this, and be used for synchronously.Be applicable to that equally also the interior network equipment NE3 of ring A claps the mark " y " of source T3 (2) when having, because do not accept model " y " from the port of NE3 to NE2 and NE4.Adopt this scheme to guarantee, clap in the time of not only source T3 (1) and also the time clap source T3 (2) and can when whole network comprises that two rings provide point-device, clap.
Other network equipments in described inaccessible sample also can be used to encircle are clapped input equipment when it not necessarily is exactly.
Theme of the present invention recited above for example can be realized by following embodiment.By clearly give the markers mark can make every battery limits tell a markers that is received be oneself send by this equipment or as the time clap input equipment, perhaps should the time clap the source of clapping when coming from another, thereby can use.
The markers bit S1 that illustrates in ITU-T suggestion G.707 is positioned at the upper strata of each STM-N signal, and by the time send out quality signal.Wherein only defined byte 5 to 8.There is not the byte of the S1 bit of explanation to can be used for transmitting additional mark.That is to say, in a SDH network, send into one with reference to the time when clapping, clap quality when under any circumstance all defining.On this position, can insert equipment equally, promptly import the clear and definite mark of the equipment of clapping when described.This mark is the same with markers then continuous by the SDH Network Transmission at the STM-N signal relay.Each network equipment can to arrive at the time clap quality and estimate, and whether confirm should the time to clap be that equipment itself is sent into network.In S1, use byte 1 to 4 can obtain 16 kinds of different marks, they have respectively can be used for network the time clap quality.So can imagine for example 16 equipment, they are clapped when network is sent into one with quality Q 1, and can clearly identify based on mark.Clap during for each network when the territory then has 16 Q1, Q2 and Q3 respectively and clap the source, promptly have at most 48 available.The additional expenditure that is used for a synchronous planning officer only be to confirm to be present in network the time clap the additional marking of base station, this mark must be clear and definite, and includes inaccessible sample in and give in the planning.In network the time clap the base station definition and carry out at present by the quality that this definition provides.
Clap the network equipment when which benchmark is another kind of scheme of the present invention be to distinguish clearly and sent a markers, its scheme is to use the network service access point address nsap address.Each network equipment all has a worldwide unique this address.By this uniqueness, nsap address can be suitable for determining that as the differentiation standard which network equipment has sent a markers.This nsap address can be used as the interior information of STM-N upper strata bit and the markers in the SDH network is together transmitted.Because nsap address comprises a plurality of bytes, so can imagine this nsap address is divided, through the transmission of a plurality of SDH frames and have a detection and.Utilize this method in fact can handle to clap when much more unlimited base station, and they in network, have clap when identical quality and as the time bat source use.The advantage that this scheme is brought is not need for planning officer or operation person pay extra expense and give markers work synchronously.Calculate and compare by the address of the nsap address that will receive in company with markers and equipment, can get rid of and clap closed loop when occurring in the network.
For whether estimate certain markers that receives be that the NE that estimated sends or be to allow to use in principle, also can introduce definite quality numerical value.
That is to say that the network equipment that mark is estimated will compare the markers that the received quality numerical value according to a port and a definition.
The advantage that this scheme is brought is, carry out an additional software in the ring that the extra work of estimating markers or network equipment feature only need the particular network device in network constitutes and put question to and get final product, because the present nearly all equipment of the transmission of quality numerical value in the SDH network all can be realized.Do not need to carry out the expansion of standard, for example relate to the standard expansion on SDH upper strata.
For fear of the network equipment in networking, clap closed loop when for example the network equipment that makes up and many network equipments constitute in forming first and second subnets, can use inaccessible sample, for example be on the crossover position between the subnet.
This crossover position for example can constitute by first and second linkage units or the network equipment, and wherein said first linkage unit is the part of first subnet, and described second linkage unit is the part of second subnet.Can use the synchronous time mark of other subnets like this, simultaneously can be by the comparison of the mark that receives on the particular port with the inaccessible sample of the network equipment of programming, target is rotated when preventing.This obturation sample can be realized clapping in short-term bridging and improve synchronous flexibility.Must in compound transmission network, define other inaccessible sample in addition,, and expand synchronous possibility so that prevent from the rotation markers in subring, for example to occur.Think that from our view this obturation sample mainly contains the jaws equipment of beating in when being beneficial to.
Mainly need carry out producer's repacking for the application of this new function in network to the equipment in using.
Claims (10)
1 and network, the network equipment (the NE A that connects of communication network particularly, NE B, ..., NE X) method for synchronous, wherein at least one first network equipment (NE A) was clapped source (T3 (Q1), T3 (Q2)) at first o'clock and is linked to each other with one, and from described first network equipment (NE A), to other network equipments (the NE B that links to each other with described first network equipment (NE A), ..., NE F......) send a markers, and described other network equipments (NE B, ..., NE F......) also can interconnect, it is characterized in that
For discerning at described first o'clock and clap source (T3 (Q1)), by described first network equipment (NE A) the time clap base station and give a mark,
And in the ring that constitutes by the described network equipment, at least one described network equipment (NE A, NEB ..., NEX) in the storage described mark,
When the described source (T3 (Q1)) of clapping first time when losing efficacy, the interconnective network equipment of described annular (NEA, NE B ..., NE X) in the markers circulation be prevented from this, i.e. the comparison of the signal that is received and the signal of being stored,
Under the situation of unanimity, clap source (T3 (Q1)) and affiliated transmission signals at described first o'clock and be not used in the synchronous of the network equipment, and the described network equipment (NE A, NE B, ..., NE X) synchronously by another the time clap the network equipment (NE X) that source (T3 (Q2)) links to each other when clapping source (T3 (Q2)) and one and carry out with this, wherein said another the time bat source (T3 (the Q2)) network equipment (NE X) that bat source (T3 (Q2)) links to each other by with this time time bat base station distribute to a mark.
2, the method for claim 1 is characterized in that, clap when described (T3 (Q1), T3 (Q2) ...) and quality serve as a mark.
3, the method for claim 1 is characterized in that, serves as a mark with other identifying informations.
4, method as claimed in claim 3 is characterized in that, described other identifying informations are made of the specific feature of the network equipment.
5, as any one described method in the above-mentioned claim, it is characterized in that, the feature that the described network equipment is specific and the time continuation transmission of quality in network of clapping adopt synchronous digital hierarchy (SDH) to carry out at the top layer of a STM-N frame.
6, the method for claim 1 is characterized in that, for transmitting described mark, uses the bit (bit 1-4) of markers byte (S1) in the top layer of STM-N.
7, method as claimed in claim 3 is characterized in that, as the specific feature of the described network equipment, the dot address that the network service inserts adopts the nsap address of corresponding network equipment (NE X).
8, the method for claim 1 is characterized in that, in described network, and when at least two subnet interconnection, the described mark of at least one network equipment stored of the transition region between subnet or each subnet.
9, method as claimed in claim 8, it is characterized in that, described transition region constitutes by first and second linkage units, wherein first linkage unit is the part of first subnet, second linkage unit is the part of second subnet, in described first and second linkage units, when the mark that is received on the selected port at corresponding linkage unit is equal to the mark that adjacent subnet or other subnets store, clap during prevention the source use and the time target continue transmission.
10, method as claimed in claim 9 is characterized in that, described linkage unit is that the one or more network equipments by corresponding network constitute.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19910349.6 | 1999-03-09 | ||
| DE1999110349 DE19910349A1 (en) | 1999-03-09 | 1999-03-09 | Synchronisation method for network elements connected to communication network |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1269654A true CN1269654A (en) | 2000-10-11 |
Family
ID=7900259
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 00108610 Pending CN1269654A (en) | 1999-03-09 | 2000-03-09 | Method for synchronising network apparatus in networks |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN1269654A (en) |
| DE (1) | DE19910349A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100375437C (en) * | 2004-06-30 | 2008-03-12 | 联想(北京)有限公司 | Network safety equipment synchronizing method under cluster mode |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104158994B (en) * | 2014-08-26 | 2018-01-02 | 烽火通信科技股份有限公司 | Realize the circuit of span public affair |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4446511A1 (en) * | 1994-12-24 | 1996-06-27 | Sel Alcatel Ag | Synchronous digital message transmission system with hierarchical synchronization network |
| DE19653261A1 (en) * | 1996-12-20 | 1998-06-25 | Alsthom Cge Alcatel | Synchronous digital message transmission system, control device, network element and central clock generator |
-
1999
- 1999-03-09 DE DE1999110349 patent/DE19910349A1/en not_active Withdrawn
-
2000
- 2000-03-09 CN CN 00108610 patent/CN1269654A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100375437C (en) * | 2004-06-30 | 2008-03-12 | 联想(北京)有限公司 | Network safety equipment synchronizing method under cluster mode |
Also Published As
| Publication number | Publication date |
|---|---|
| DE19910349A1 (en) | 2000-10-05 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN1175642C (en) | Clock management method and transmission equipment for synchronous network system | |
| EP3599729B1 (en) | Method and apparatus of clock transmission between networks | |
| EP1916799B1 (en) | A method for automatically implementing tandem concatenation monitoring and apparatus thereof | |
| JP5480977B2 (en) | Synchronization network configuration with synchronization trail for time synchronization and frequency synchronization | |
| CN1314749A (en) | Method and device for restoring information signal of sending path in net type net | |
| US6707828B1 (en) | Synchronization of a network element in a synchronous digital communications network | |
| CN1142882A (en) | Intergrated multi-rate cross-connect system | |
| CN101465707A (en) | Method and system for transferring protection time in synchronous network | |
| WO1998035466A2 (en) | Synchronization of telecommunications network | |
| DE60103111T2 (en) | Method and circuit for providing signals of different data rates in optical transmission systems | |
| JPH11127128A (en) | Synchronizing device | |
| JP2002101064A (en) | Line rewiring method and circuit therefor | |
| EP2779489B1 (en) | Method for selecting a network clock of a local synchronization domain of a mobile network as a frequency synchronization gateway | |
| CN1274117C (en) | Method of preventing formation of timing loop in synchronous network | |
| CN1625858A (en) | Communications system | |
| CN1269654A (en) | Method for synchronising network apparatus in networks | |
| US6628674B1 (en) | Apparatus depending on timing source for synchronization | |
| CN110618664B (en) | Decentralized distributed control system and control method thereof | |
| CN1228894A (en) | Master-slave synchronisation | |
| US6560245B1 (en) | Telecommunications system | |
| US7835266B2 (en) | Node apparatus and maintenance and operation supporting device | |
| CN1138362C (en) | Hierarchical synchronization method | |
| KR100204042B1 (en) | High speed network data connection system for interconnection of remote lan | |
| CN1232585A (en) | Hierarchical synchronization system | |
| CN1619327A (en) | System of virtual cascade time delay alignment characteristic used for testing chip and its method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |