CN101931464A - Optical fiber hybrid network and establishing and maintaining method of communication link thereof - Google Patents
Optical fiber hybrid network and establishing and maintaining method of communication link thereof Download PDFInfo
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Abstract
The invention relates to an optical fiber hybrid network and an establishing and maintaining method of a communication link thereof. The optical fiber hybrid network comprises an accessing unit and a remote unit, wherein in the accessing unit, a characteristic code circular link is formed by circularly sending characteristic codes in an opposite direction through a main light port and an auxiliary port, and a data link is established through the main light port when the main light port and the auxiliary light port both receive mutual characteristic codes; and the main light port and the auxiliary light port are simultaneously set to respectively establish data links when the main light port and the auxiliary light port both cannot receive the mutual characteristic codes. In the remote unit, a downlink direction of a baseband signal is initially set from the main light port to the auxiliary light port; the initialization setting is maintained when it is detected that the characteristic codes from the main light port and the auxiliary light port of the accessing unit can be received; and the downlink direction of the baseband signal is set from the main light port to the auxiliary light port when the characteristic code from the main light port of the accessing unit is not received. Through bottom-layer design, the invention realizes the intelligent maintenance function of circular daisy chain network topology with lower cost and simple control principle.
Description
[technical field]
The present invention relates to be used in the mobile communication system any and the network that multi-point carries out data interaction, relate in particular to a kind of optical fiber hybrid network, and the communication link of this network is set up and maintaining method.
[technical background]
In mobile communication product is used, system's ubiquity based on the optical fiber networking, with the digital RF far-drawing system is example, it can realize a bit carrying out data interaction (uplink and downlink signals transmission) with multi-point, such network system, from topological structure, adopt star-like, daisy chain or both forms such as mixing more.
Data interaction from point-to-point to point-to-points has the process of its differentiation:
The only support point point to-point communication of traditional digital optical fiber direct station covers demand for satisfying enough mobile communication, just need set up more base station, and this makes transformation, upgrading and the replacement of whole sub-district covering system become and bothers very much; And, make and set up the cost raising that the sub-district covers that increased the input of operator greatly, therefore, the applied environment of digital optical fiber direct station and scope are all limited.
Then, support the digital RF far-drawing system of the communication mode of star-like, daisy chain and both mixed networking just to arise at the historic moment.
See also Fig. 1, a kind of digital RF far-drawing system that is operated under the daisy chain networking form, in case outage appears in prime Remote Radio Unit (as DRU3), or in the link during certain some optical fiber generation crack conditions, back level Remote Radio Unit (as DRU4) is just in paralyzed state, and the covering of back level link also loses simultaneously.
For avoiding the signal under this applied environment to cover forfeiture, on August 31st, 2005, disclosed publication number was CN1661941A and January 24, disclosed publication number was CN1901399A in 2007 Chinese patent application, all proposed to form the solution that radio frequency zooms out loop network system, its sketch sees also Fig. 2.Two parts of a kind of operation principles of the common announcement of documents:
Make each Remote Radio Unit (DRU) in the looped network all support the mode of operation of annular networking, with guarantee that even any Remote Radio Unit (DRU) breaks down or two DRU between during fibercuts, loop network link can automatically switch to two daisy chains to work on, thereby guarantee that former back level DRU or all DRU continue operate as normal, but, about how loop network link being safeguarded that specifically two documents all do not relate to achieve automatic switchover.
Can know by inference, if will satisfy the mode of operation of this annular networking, just require to comprise DAU, DRU all can discern the operating state of current self place link automatically, comprises the transmission direction of self residing link position and uplink and downlink signals.Like this, when the somewhere disconnected in the annular link, the whole digital radio frequency far-pulling loop network system link of can recombinating automatically was that the daisy chain pattern is with operate as normal.
Yet, in the CN1661941A patent application, only relate to the working surfaces of loop network system; In the CN1901399A patent application, only relate to application, solve the problem of setting up looped network.This shows, two patent applications all fail to propose a kind of technical scheme that is used to simply, efficiently to safeguard based on the communication link of the annular daisy chain hybrid network of optical fiber communication, this is the technology of corresponding communication protocol lower level, just the present invention place that will solve.
[summary of the invention]
Therefore, primary and foremost purpose of the present invention will be improved above-mentioned deficiency exactly, and a kind of optical fiber hybrid network is provided, so that this network is set up, and is easy to safeguard;
Another object of the present invention is to provide a kind of sets up and maintaining method with the corresponding communication link of this optical fiber hybrid network, make optical fiber hybrid network automatic operating state of current self the place link of identification on physical layer, safeguard with the automatic switchover that realizes communication link.
For realizing this purpose, the present invention adopts following technical scheme:
Optical fiber hybrid network of the present invention comprises access unit and at least two extension units, and each unit includes two light mouths, and is provided with the optical fiber control module; Constitute ring-type daisy chain network topology between access unit and extension unit, wherein:
The optical fiber control module of described access unit comprises:
The condition code sending module passes through corresponding light mouth belt transmission in same ring-type daisy chain network topology with the condition code of each light mouth of access unit;
Certain characteristics sign indicating number parsing module, the condition code that each light mouth of access unit is received is resolved respectively;
Signal selection module is judged when two light mouths in the same ring-type daisy chain network topology are all received the condition code that sends out each other in the access unit, stops one of light mouth baseband signal is received and sends; Otherwise open and do not receive that the corresponding light mouth of condition code receives and sends baseband signal.
The optical fiber control module of described extension unit comprises:
Certain characteristics sign indicating number parsing module is resolved the key light mouth of extension unit self and the condition code from access unit that receives from the light mouth respectively, and is sent to the state justify module;
The state justify module, whether judgement receives access unit key light mouth and the condition code of sending from the light mouth respectively, when being, record work at present state is a normal condition, for not the time, record work at present state is an abnormality, and court verdict is sent to the switching controls module;
The switching controls module, court verdict according to the state justify module produces corresponding switch-over control signal, when changing in working order, if the work at present state is a normal condition, then make principal and subordinate's light mouth of this extension unit recover existing master slave relation, if the work at present state is an abnormality, then make principal and subordinate's light mouth of this extension unit be inverted.
As expansion, can comprise key light mouth, the 3rd light mouth outside the light mouth in the described access unit, it is extension unit identical with described extension unit with at least one composition one daisy chain network topology that is connected separately.Perhaps, also can comprise key light mouth, the 3rd light mouth and the 4th light mouth outside the light mouth in the described access unit, the 3rd light mouth and the 4th light mouth and at least two extension units identical with described extension unit are common forms another ring-type daisy chain network topology identical with described ring-type daisy chain network topology.
Communication link of the present invention is set up and maintaining method, in the optical fiber hybrid network that is applied to form, wherein with ring-type daisy chain network topology by an access unit and at least two extension units:
In access unit, by its key light mouth with go in ring this network topology from the light mouth relative to the condition code that sends sign light mouth self to form the belt link of condition code, at the key light mouth with when the light mouth is all received each other condition code, by the key light mouth in this network topology, send and receiving baseband signal to form data link; At the key light mouth with when the light mouth all fails to receive each other condition code, the key light mouth and from the light mouth be set to simultaneously this network topology, send and receiving baseband signal with the formation data link;
In extension unit, the initialization setting is that the baseband signal down direction is to mate corresponding data link from the light mouth extremely by its key light mouth, the belt link of condition code is detected in real time, when it detects from the key light mouth of access unit with when the condition code of light mouth all can be received, keep this initialization setting; When it detects when failing to receive the condition code of access unit key light mouth, this extension unit is set for by being that the baseband signal down direction is to mate corresponding data link from light mouth to key light mouth.
Access unit sends before the condition code, is about to condition code earlier to carry out framing, and after any light mouth of access unit and/or extension unit receives condition code, condition code is resolved so that separate frame obtain condition code.
In each extension unit, utilize the key light mouth and whether receive that from the light mouth condition code carries out the judgement of operating state, when two light mouths were all received condition code, record work at present state was a normal condition, if operating state changes, send switch-over control signal and keep described initialization setting; When only when the light mouth can be received condition code from access unit, record work at present state is an abnormality, if operating state changes, sends switch-over control signal and sets by being the baseband signal down direction from light mouth to key light mouth.
Described this switch-over control signal comprises data switching signal and clock switching signal;
In the setting step after being changed to normal condition, the data switching signal is sent out setting the key light mouth in view of the above corresponding to the key light mouth logic that is used to handle communication data in this extension unit, and from the light mouth corresponding to be used to this extension unit to handle communication data from light mouth logic to guarantee by the key light mouth to being the baseband signal down direction from the light mouth; And the clock switching signal is sent to the Clock Managing Unit 21 of this extension unit, to carry out the serializer/deserializer with the corresponding key light mouth of key light mouth logic of external clock reference and new settings phase-locked;
In the setting step after being changed to abnormality, the data switching signal is sent out setting in view of the above from the light mouth corresponding to the key light mouth logic that is used to handle communication data this extension unit, and the key light mouth corresponding to be used in this extension unit to handle communication data from light mouth logic to guarantee by being the baseband signal down direction from light mouth to key light mouth; And the clock switching signal is sent to the Clock Managing Unit 21 of this extension unit, to carry out phase-locked with the corresponding serializer/deserializer from the light mouth of key light mouth logic external clock reference and new settings.
In the access unit, when two condition codes all were received, adjudicating current ring-type daisy chain network topology was normal operating conditions, stopped from the light mouth to the reception of up-downgoing baseband signal with send to close this data link.
The condition code of each light mouth of access unit is provided with priority, in the consolidated network topology, uses the highest light mouth of priority to be used to set up described data link.
In addition, the present invention also discloses a kind of digital RF far-drawing system, and it adopts optical fiber hybrid network of the present invention and described communication link to set up and maintaining method.
Compared with prior art, the present invention possesses following advantage:
At first, the present invention can design in physical layer, mainly is the design of carrying out at optic module and controlled function thereof, be convenient to realize that less demanding to sequential, design margin is looser, thereby greatly reduce technical staff's development difficulty, significantly shortened the R﹠D cycle;
Secondly, because this simple design, on the one hand, more simple and convenient becomes in the foundation of communication link and the maintenance; On the other hand, need not the control that use on the upper strata, reduced the complexity of system, the similar project of feasible digital RF far-drawing system that adopts this optical fiber hybrid network and so on has intelligent automation degree height, stable performance, network reliability advantages of higher.
[description of drawings]
Fig. 1 is known a kind of structural representation that adopts the digital RF far-drawing system of daisy chain network topology;
Fig. 2 is the structural representation of the digital RF far-drawing system of employing optical fiber hybrid network of the present invention;
Fig. 3 is the structural representation of the condition code sending module of access unit optical fiber control module of the present invention;
Fig. 4 is the structural representation of the signal selection module and the condition code judging module of access unit optical fiber control module of the present invention;
Fig. 5 is the structural representation of extension unit optical fiber control module of the present invention;
Fig. 6 is the operation principle schematic diagram of extension unit optical fiber control module of the present invention.
[embodiment]
The present invention is further illustrated below in conjunction with drawings and Examples:
See also Fig. 2, the most preferred embodiment of optical fiber hybrid network of the present invention is applied in a kind of structural representation of digital RF far-drawing system, at physical layer, comprise an access unit DAU and several extension units DRU, wherein, by extension unit DRU1, DRU2, DRU3, DRU4 by optical fiber chrysanthemum chain order mutually after the serial connection, the key light mouth A of two ends by optical fiber and access unit DAU be connected from light mouth B, with formation ring-type daisy chain network topology.
Need to prove, in an optical fiber hybrid network, ring-type daisy chain network topology of the present invention can be for more than two, prerequisite be access unit DAU need mostly be each ring-type daisy chain network topology be equipped with two light mouths for example not shown be equivalent to access unit key light mouth A and from the 3rd, the 4th light mouth of light mouth B, so, just can form a plurality of ring-type daisy chain network topologies by an access unit DAU, adopt identical operation principle in the different network topologies, and identical hardware gets final product.
Further, automatic switching function designs because design of the present invention is based on, it allows to switch between ring-type daisy chain network topology and simple daisy chain network topology, thereby the 3rd light mouth C as shown in Figure 2 can be used for independently setting up a simple daisy chain network topology with at least one extension unit DRU5.
This shows that the flexibility ratio of networking mode of the present invention is very high.
In the present embodiment, access unit DAU can be equal to the digital access unit of digital RF far-drawing system, and extension unit can be equal to the digital radio frequency far-pulling unit of its digital RF far-drawing system.
Described access unit DAU has an optical fiber control module, and it is used to manage several light mouths that access unit DAU is had, as key light mouth A among Fig. 2, from light mouth B and the 3rd light mouth C.
See also Fig. 3 and Fig. 4, the optical fiber control module of this access unit DAU comprises a condition code sending module (11,12,13), a signal selection module 15, and several features sign indicating number parsing module (141,142,143).
Described condition code sending module (11,12,13), it is with the key light mouth A of access unit DAU, from light mouth B, the identity feature code (ID) of light mouths such as the 3rd light mouth C is according to CPRI (general public wave point) agreement, as the User Defined control word, framing is in the CPRI frame data, and send to each corresponding light mouth respectively, then further from each light mouth, belt through relative light mouth in each ring-type daisy chain network topology, in Fig. 2, the condition code ID_A of key light mouth A will go in ring and send to from light mouth B, to go in ring from the condition code ID_B of light mouth B and to send to key light mouth A, at this moment, suppose that each light mouth sends condition code and is respectively " ID_A " shown in Figure 3, " ID_B ", " ID_C " is for realizing the convenience of control, also for the condition code of each light mouth is provided with priority, order is: " ID_A "＞" ID_B "＞" ID_C ".
Described several features sign indicating number parsing module (141,142,143), corresponding to each light mouth of access unit DAU (A, B C), resolve with the condition code that each light mouth is received, and also promptly separate frame---by obtaining corresponding condition code in the CPRI frame.
After arriving another light mouth behind the condition code framing from light mouth and successfully being resolved, it is the belt link of constitutive characteristic sign indicating number, the belt link of condition code is two-way, so that detect by the condition code of same extension unit (DRU1-DRU4) in loop, with the on off operating mode of correct judgement current network to its two ends.
For the repetition up-downgoing baseband signal of avoiding producing under the annular networking state receives and situation about sending, for the data link that is used for transmission base band, under acquiescence (initialization setting) situation, access unit DAU is a basis with its priority, the key light mouth A that determines high priority is used to set up data link, particularly, it is used to send the downgoing baseband signal, and is used to receive the uplink baseband signal.Data link is different with the belt link of condition code, and in the network topology of same connection, data link is set to only transmit by a light mouth.
In order to further specify the link of setting up of data link, need further to understand described signal selection module 15.For same ring-type daisy chain network topology, this signal selection module 15 reads its key light mouth A and from the condition code of light mouth B after resolving, all successfully resolved and successfully read when two condition codes and be read at key light mouth A as ID_B, ID_A is when light mouth B is read, illustrate that current ring-type daisy chain network topology is operated in normal condition, network-in-dialing is no abnormal, at this moment, echo the setting principle of above-mentioned data link, it keeps the higher key light mouth A of priority to be used for the foundation and the running of data link, and the function of, then closing (or claiming to stop) its data link for from light mouth B repeats to receive avoiding with the up-downgoing baseband signal of closing the loop end.Thus, during ring-type daisy chain network topology operate as normal, the downgoing baseband signal is sent to each extension unit by key light mouth A, and by each extension unit the uplink baseband signal is sent to this key light mouth A, does not participate in the transmission of baseband signal from light mouth B.But, fail to confirm its key light mouth A and the condition code of receiving from light mouth B as signal selection module 15, mean that network topology opens circuit, at this moment, position regardless of the node that opens circuit, it is two simple daisy chain network topologies of end points that ring-type daisy chain network topology originally disconnects physically with key light mouth A with from light mouth B, key light mouth A is owing to be defaulted as the turn-on data chain circuit function, thereby corresponding each extension unit that normally is connected with its maintenance all can proper communication, and with other extension unit that is connected from light mouth B and can not normally be connected with key light mouth A, the linkage function of data link will be lost, at this moment, signal selection module 15 sends baseband signal transmission and the receiving function of signal enabling from light mouth B, thus, makes two new simple daisy chain network topologies that form all realize the foundation of data link.
See also Fig. 5 and Fig. 6, foundation and maintenance for belt link of the condition code that cooperates access unit DAU and data link, each extension unit of the present invention all has an optical fiber control module, be used to manage key light mouth A ' physically that extension unit has and from light mouth B ', and in the inner control logic of extension unit, has a key light mouth logic master, it is by setting up the communication data that the mapping corresponding relation is handled this physics key light mouth A ' with physics key light mouth A ', in like manner, have one from light mouth logic slave, it is by setting up the corresponding communication data of handling this physics from light mouth B ' of mapping with physics from light mouth B ', in addition, extension unit has Clock Managing Unit 21, and its serializer/deserializer of being responsible for being provided with the pairing physics light of key light mouth logic master mouth is carried out phase-locked.
The optical fiber control module of described extension unit comprises several features sign indicating number parsing module (221,223), a state justify module 23 and a switching control module 24,
Certain characteristics sign indicating number parsing module (221,223), in the present embodiment, its number is two with key light mouth A ' with from light mouth B ' is corresponding, it is used for resolving respectively the key light mouth A ' of extension unit self and the condition code from access unit DAU that receives from light mouth B ', and sends to state justify module 23.Particularly, when the initialization of extension unit was provided with, the key light mouth logic master that it is inner was corresponding with physics key light mouth A ', from the then corresponding physics of light mouth logic slave from light mouth B '.At this moment, on physical structure, the key light mouth A ' of extension unit be connected with access unit DAU key light mouth A (ignore access unit DAU and this extension unit in the middle of other extension unit), and extension unit from light mouth B ' and access unit DAU from light mouth B be connected (ignore access unit DAU and this extension unit in the middle of other extension unit), thus, under the normal situation of communication (during ring-type daisy chain network topology operate as normal), the key light mouth A of access unit DAU sends out condition code ID_A, the key light mouth A ' of extension unit will receive this condition code, can separate frame smoothly with the corresponding condition code parsing module 221 of this key light mouth A ' and go out this condition code, in like manner, extension unit also can separate frame smoothly from light mouth B ' and obtain the condition code ID_B that access unit DAU sends from light mouth B.
The key light mouth A ' of same extension unit reaches can receive condition code ID_A and ID_B respectively from light mouth B ', means that current ring-type daisy chain network topology works in normal condition.Because between the key light mouth logic master and key light mouth A ' of extension unit when initialization, set up corresponding relation from light mouth logic slave and between light mouth B ', thereby, the data link that access unit DAU desire is set up by key light mouth A transmission, to be assisted to set up and identification by key light mouth A ' by key light mouth logic master, key light mouth A ' thus setting up the back in data link is used to receive the descending baseband signal of access unit DAU key light mouth A, and responsible forwarded upstream also is that key light mouth A ' extremely is defined as the descending direction of baseband signal from the direction of light mouth B ' from the uplink baseband signal that belongs to follow-up unit of this extension unit from light mouth B '; In like manner, extension unit from light mouth logic slave by assist to set up data link and recognition data link from light mouth B ', from light mouth B ' thus setting up the back in data link is used to receive uplink baseband signal forwarding that the follow-up unit transmission of this extension unit comes and continues up to key light mouth A ', and the next downgoing baseband signal that belongs to follow-up unit of key light mouth A ' forwarding of transmitting this extension unit, also promptly the direction from light mouth B ' to key light mouth A ' is defined as the up direction of baseband signal.
But, occur when unusual in ring-type daisy chain network topology, need an adaptive switched mechanism, to guarantee that each extension unit under the former network topology can operate as normal.Please continue to consult following explanation.
Described state justify module 23, receive each condition code parsing module (221 in this extension unit, 223) signal that sends, adjudicate key light mouth A ' and whether receive access unit DAU key light mouth A and the condition code ID_A and the ID_B that send from light mouth B respectively from light mouth B ', when being, illustrate that this extension unit leads to access unit DAU key light mouth A and is communicated with from the physical circuit of light mouth B, so record work at present state is a normal condition, for not the time, this extension unit and access unit DAU key light mouth A are described and interrupt from the physical circuit of light mouth B, record work at present state is an abnormality, and court verdict is sent to switching controls module 24.
Described switching controls module 24, court verdict according to state justify module 23 produces corresponding switch-over control signal, when changing in working order, if the work at present state is a normal condition, then make the key light mouth A ' of this extension unit and recover existing master slave relation from light mouth B ', if the work at present state is an abnormality, then makes the key light mouth A ' of this extension unit and be inverted from light mouth B '.
As previously mentioned, extension unit is initialized to key light mouth A ' and is mapped to inner key light mouth logic master, thereby, after network disconnects, the data link that keeps each extension unit of being connected with access unit DAU key light mouth A end is operate as normal still, and the data link of each extension unit that is connected from the maintenance of light mouth B end with access unit DAU then can't be worked.For this part extension unit of failing to be communicated with, thereby the signal selection module 15 of access unit DAU also will monitor to open circuit and open it and rebulid data link from reception and transmission that light mouth B carries out baseband signal owing to this moment, thereby, the key light mouth logic master in the extension unit of Lian Tonging and need reset and key light mouth A ' and not from the mapping relations between the light mouth B ' from light mouth logic slave.
For the extension unit that is not communicated with, if described switching controls module 24 detects current working state and changes with respect to the operating state of last record, and current working state is for being off state unusually, mean former network topology interruption, this extension unit can not receive the condition code from access unit DAU key light mouth A, just produce one and switch control signal, this switch-over control signal comprises data switching signal and clock switching signal, its data switching signal is used for key light mouth logic master being switched to and setting up the mapping corresponding relation from light mouth B ', sets up the mapping corresponding relation and will switch to key light mouth A ' from light mouth logic slave; And this clock switching signal sends to Clock Managing Unit 21, Clock Managing Unit 21 switches to external clock reference and carries out phase-locked with serializer/deserializer SERDES B from light mouth B ' (master is corresponding with key light mouth logic), thus, finished key light mouth A ' physically and set from the inversion of the internal logic of light mouth B ', in fact, equal key light mouth A ' physically extremely is defined as the up direction of baseband signal from the direction of light mouth B ', and the direction from light mouth B ' to key light mouth A ' physically is defined as the descending direction of baseband signal, so that it is suitable for further foundation based on the new simple daisy chain network topology that forms from light mouth B from being provided with mutually of light mouth B with access unit DAU.In case this new daisy chain network topology is built up, former ring-type daisy chain network topology promptly is separated into two simple daisy chain network topologies that can run well.
But, if described switching controls module 24 detects current working state in real time and changes with respect to the operating state of last record, and current working state is a normal condition, be when any one extension unit all can normally be received two condition codes in the former ring-type daisy chain network topology, the fault that means original interruption is excluded, and two simple daisy chain network topologies should be reconsolidated reverts to ring-type daisy chain network topology.At this moment, this extension unit produces one and switches control signal, this switch-over control signal comprises data switching signal and clock switching signal equally, its data switching signal is used for key light mouth logic master switched to key light mouth A ' physically is corresponding and (is equal to recovery for the light mouth that has been squeezed, can not all rightly reset for the light mouth that is not squeezed), and this clock switching signal sends to Clock Managing Unit 21, serializer/deserializer SERDES A that Clock Managing Unit 21 in like manner switches to external clock reference with key light mouth A ' carries out phase-locked (in fact each extension unit and the corresponding light mouth of key light mouth logic master all should be key light mouth A ' when ring-type daisy chain network topology operate as normal), and this moment, access unit DAU also will close its baseband signal transmission-receiving function from light mouth B, data link is still set up by the key light mouth A of access unit DAU, running, all reinstatements.
Thus, by the optical fiber control module that inserts in cells D AU and the extension unit is separately carried out appropriate design, can realize intelligence, set up automatically, the function of maintain communications link.
For more clearly explaining the present invention, following application example of setting forth present embodiment in conjunction with Fig. 2:
If current extension unit be " DRU4 " among Fig. 2, the condition code that this moment, this extension unit DRU4 parsed from its key light mouth is " ID_A ", promptly from the key light mouth A of access unit DAU; Then parse condition code from it from the light mouth and be " ID_B ", extension unit optical fiber control module is adjudicated the normal operating conditions that current state is a ring-type daisy chain network topology thus, need not carry out any switching.The optical fiber control module of access unit DAU carries out closing its up-downgoing IQ data (baseband signal) from light mouth B after the analysis judgment.This moment, downgoing baseband signal trend was " DAU-DRU1-DRU2-DRU4-DRU3 ", uplink baseband signal trend is " DRU3-DRU4-DRU2-DRU1-DAU ", and the serializer of the key light mouth of external clock reference and this extension unit DRU4/deserializer SERDES A carries out phase-locked.
If optical fiber ruptures between extension unit DRU2 and the extension unit DRU4 at this moment, the key light mouth condition code parsing module 221 of extension unit DRU4 can not resolved normal data, and it still can be resolved to condition code " ID_B " from light mouth condition code parsing module 223.State justify module 23 is just adjudicated to loop disconnects, and informs switching controls module 24.Switching controls module 24 produces switching signal in view of the above, external clock reference switch to this extension unit DRU4 the serializer from light mouth B '/deserializer SERDES B carries out phase-locked; The while data division will switch to corresponding with key light mouth logic master from light mouth B ' data, and key light mouth A ' data switch to corresponding from light mouth logic slave.Simultaneously, same switching also can take place in extension unit DRU3, thereby whole system switches to two simple daisy chain network topology patterns as Fig. 1.After access unit DAU carries out analysis judgment, open self up-downgoing base band data transmission-receiving function from light mouth B, this moment, downgoing baseband data trend had two, be respectively " DAU-DRU1-DRU2 ", " DAU-DRU3-DRU4 ", uplink baseband data trend also has two, be respectively " DRU2-DRU1-DAU ", " DRU4-DRU3-DAU ".
After the optical fiber of fracture recovers, extension unit DRU3 and DRU4 all can successfully receive the light mouth condition code ID_A and the ID_B of both direction once more, can switch once more according to the light mouth priority that sets in advance simultaneously so that recover as shown in Figure 2 virgin work state.
In sum, the bottom-layer design that the present invention carries out the optical fiber control module that inserts cells D AU and extension unit, with lower cost, easy control principle, the intelligence that has realized ring-type daisy chain network topology is from maintenance function.
The foregoing description is a preferred implementation of the present invention; but embodiments of the present invention not merely are restricted to the described embodiments; other any do not deviate from change, the modification done under spirit of the present invention and the principle, substitutes, combination, simplify; all should be the substitute mode of equivalence, be included within protection scope of the present invention.
Claims (10)
1. an optical fiber hybrid network comprises access unit and at least two extension units, and each unit includes two light mouths, and is provided with the optical fiber control module; Constitute ring-type daisy chain network topology between access unit and extension unit, it is characterized in that:
The optical fiber control module of described access unit comprises:
The condition code sending module passes through corresponding light mouth belt transmission in same ring-type daisy chain network topology with the condition code of each light mouth of access unit;
Certain characteristics sign indicating number parsing module, the condition code that each light mouth of access unit is received is resolved respectively;
Signal selection module is judged when two light mouths in the same ring-type daisy chain network topology are all received the condition code that sends out each other in the access unit, stops one of light mouth baseband signal is received and sends; Otherwise open and do not receive that the corresponding light mouth of condition code receives and sends baseband signal.
The optical fiber control module of described extension unit comprises:
Certain characteristics sign indicating number parsing module is resolved the key light mouth of extension unit self and the condition code from access unit that receives from the light mouth respectively, and is sent to the state justify module;
The state justify module, whether judgement receives access unit key light mouth and the condition code of sending from the light mouth respectively, when being, record work at present state is a normal condition, for not the time, record work at present state is an abnormality, and court verdict is sent to the switching controls module;
The switching controls module, court verdict according to the state justify module produces corresponding switch-over control signal, when changing in working order, if the work at present state is a normal condition, then make principal and subordinate's light mouth of this extension unit recover existing master slave relation, if the work at present state is an abnormality, then make principal and subordinate's light mouth of this extension unit be inverted.
2. optical fiber hybrid network according to claim 1, it is characterized in that, comprise key light mouth, the 3rd light mouth outside the light mouth in the described access unit, it is extension unit identical with described extension unit with at least one composition one daisy chain network topology that is connected separately.
3. optical fiber hybrid network according to claim 1, it is characterized in that, comprise key light mouth, the 3rd light mouth and the 4th light mouth outside the light mouth in the described access unit, the 3rd light mouth and the 4th light mouth and at least two extension units identical with described extension unit are common forms another ring-type daisy chain network topology identical with described ring-type daisy chain network topology.
4. a communication link is set up and maintaining method, in the optical fiber hybrid network with ring-type daisy chain network topology that is applied to be made up of an access unit and at least two extension units, it is characterized in that:
In access unit, by its key light mouth with go in ring this network topology from the light mouth relative to the condition code that sends sign light mouth self to form the belt link of condition code, at the key light mouth with when the light mouth is all received each other condition code, by the key light mouth in this network topology, send and receiving baseband signal to form data link; At the key light mouth with when the light mouth all fails to receive each other condition code, the key light mouth and from the light mouth be set to simultaneously this network topology, send and receiving baseband signal with the formation data link;
In extension unit, the initialization setting is that the baseband signal down direction is to mate corresponding data link from the light mouth extremely by its key light mouth, the belt link of condition code is detected in real time, when it detects from the key light mouth of access unit with when the condition code of light mouth all can be received, keep this initialization setting; When it detects when failing to receive the condition code of access unit key light mouth, this extension unit is set for by being that the baseband signal down direction is to mate corresponding data link from light mouth to key light mouth.
5. communication link according to claim 4 is set up and maintaining method, it is characterized in that: access unit sends before the condition code, be about to condition code earlier and carry out framing, and after any light mouth of access unit and/or extension unit receives condition code, condition code is resolved so that separate frame acquisition condition code.
6. communication link according to claim 5 is set up and maintaining method, it is characterized in that: in each extension unit, utilize the key light mouth and whether receive that from the light mouth condition code carries out the judgement of operating state, when two light mouths are all received condition code, record work at present state is a normal condition, if operating state changes, send switch-over control signal and keep described initialization setting; When only when the light mouth can be received condition code from access unit, record work at present state is an abnormality, if operating state changes, sends switch-over control signal and sets by being the baseband signal down direction from light mouth to key light mouth.
7. communication link according to claim 6 is set up and maintaining method, it is characterized in that:
Described this switch-over control signal comprises data switching signal and clock switching signal;
In the setting step after being changed to normal condition, the data switching signal is sent out setting the key light mouth in view of the above corresponding to the key light mouth logic that is used to handle communication data in this extension unit, and from the light mouth corresponding to be used to this extension unit to handle communication data from light mouth logic to guarantee by the key light mouth to being the baseband signal down direction from the light mouth; And the clock switching signal is sent to the Clock Managing Unit 21 of this extension unit, to carry out the serializer/deserializer with the corresponding key light mouth of key light mouth logic of external clock reference and new settings phase-locked;
In the setting step after being changed to abnormality, the data switching signal is sent out setting in view of the above from the light mouth corresponding to the key light mouth logic that is used to handle communication data this extension unit, and the key light mouth corresponding to be used in this extension unit to handle communication data from light mouth logic to guarantee by being the baseband signal down direction from light mouth to key light mouth; And the clock switching signal is sent to the Clock Managing Unit 21 of this extension unit, to carry out phase-locked with the corresponding serializer/deserializer from the light mouth of key light mouth logic external clock reference and new settings.
8. set up and maintaining method according to any described communication link in the claim 4 to 7, it is characterized in that: in the access unit, when two condition codes all are received, adjudicating current ring-type daisy chain network topology is normal operating conditions, stops from the light mouth to the reception of up-downgoing baseband signal with send to close this data link.
9. set up and maintaining method according to any described communication link in the claim 4 to 7, it is characterized in that: the condition code of each light mouth of access unit is provided with priority, in the consolidated network topology, use the highest light mouth of priority to be used to set up described data link.
10. a digital RF far-drawing system is characterized in that, its adopt with claim 4 to 9 in any described communication link set up and maintaining method.
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| CN101931464B (en) | 2013-08-14 |
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