CN101442457B - Method for switching physical layer relay direction, relay equipment and coaxial network system - Google Patents
Method for switching physical layer relay direction, relay equipment and coaxial network system Download PDFInfo
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- CN101442457B CN101442457B CN2007101779338A CN200710177933A CN101442457B CN 101442457 B CN101442457 B CN 101442457B CN 2007101779338 A CN2007101779338 A CN 2007101779338A CN 200710177933 A CN200710177933 A CN 200710177933A CN 101442457 B CN101442457 B CN 101442457B
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Abstract
The invention discloses a physical layer trunking direction switching method. The method comprises: receiving a quick connection pulse from a coaxial line terminal CLT physical layer, analyzing bus occupation time information from the received quick connection pulse, and switching the trunking direction of trunk equipment according to the bus occupation time information. The invention also discloses trunk equipment and a coaxial network system for carrying out physical layer trunking direction switching. The proposal of the invention can effectively improve the performance of EPCN comprising the trunk equipment in the process of information transmission.
Description
Technical field
The present invention relates to the relaying technique in the communication system, relate in particular to physical layer trunking direction changing method, trunking and coaxial network system in a kind of Ethernet passive coaxial network (EPCN).
Background technology
Development of electronic technology makes coaxial network become one of the widest Internet resources of present covering with progressive, and wherein class coaxial network commonly used is the EPCN that has adopted ethernet technology.
Fig. 1 shows the structural representation of existing EPCN.Referring to Fig. 1, in present EPCN, mainly comprise coaxial line terminal (CLT) and coaxial network unit (CNU) two kind equipments, carry out the communicating by letter of time division way of point-to-multipoint between each CLT and a plurality of CNU.Specifically, downlink communication and uplink communication all take physical bus according to time division way, promptly in the descending transmission stage, CLT sends information by physical bus to all CNU, and in the up transmission stage, a plurality of CNU timesharing take physical bus, respectively information are separately sent to CLT.The time that up direction and down direction take physical bus can set in advance, and these two times can be identical, also can be different.
The penetration capacity that the important technology index is a physical layer of EPCN.The penetration capacity of physical chip is strong more, and its scope that can cover is big more, but manufacturing cost is also high more.When networking, the Web designer selects the physical chip that is fit to according to this technical indicator of penetration capacity, thereby reaches purpose such as reduce number of chips, reduce cost.But, because the restriction of technical merit and cost, when practical application, often can't find and not only satisfy the physical chip quantitative requirement, but also satisfy the low-cost networking mode that requires.There is a kind of consideration to be at present, between CLT and CNU, increases physical layer trunking, the transfer between physical layer as CLT and a plurality of CNU.But, because physical layer trunking equipment belongs to the half-duplex chip, need medium access control (MAC) the layer chip among the EPCN that the repeated direction of physical layer trunking equipment is carried out whole process control, so that trunking sends and receives information between CLT and CNU normally.Like this, because MAC layer chip is merely able to processing digital signal, and the communication of physical layer use is analog signal, therefore all must be during the executive control operation each time of MAC layer chip through the conversion of numeral with analog signal, make that complicated operation, the processing speed of EPCN in message transmission that comprises trunking is slower, cause the poor-performing of whole EPCN.On the other hand, MAC layer chip should guarantee normally carrying out of original Control work, incessantly trunking carried out the conversion of repeated direction again, therefore has only high performance MAC layer chip to meet the demands, and realizes that cost is higher; And the burden of MAC layer chip is heavier, forms the control bottleneck easily.Have, the place one's entire reliance upon control of MAC chip of trunking is when MAC layer chip breaks down again, trunking can't determine to carry out this moment the message transmission of which kind of direction voluntarily, but can only quit work, the termination of communicating by letter between CLT and the CNU so, the reliability of visible this scheme is lower.
Summary of the invention
The invention provides a kind of physical layer trunking direction changing method, can improve the performance of EPCN in message transmission that comprises trunking.
In physical layer trunking direction changing method of the present invention, comprising: receive the quick connection pulse FLP that comes from coaxial line terminal CLT physical layer, from the FLP that receives, parse bus holding time information; According to the bus holding time information that gets access to, determine to go up row bus holding time and following row bus holding time; When down the row bus holding time finishes, the repeated direction of described trunking is switched to up direction; When up holding time finishes, the repeated direction of described trunking is switched to down direction.
The present invention also provides a kind of trunking, can improve the performance of EPCN in message transmission that comprises trunking.
In trunking of the present invention, comprise: interface module and control module, wherein, described interface module is used to receive the quick connection pulse FLP that comes from coaxial line terminal CLT physical layer, the FLP that receives is sent to described control module, and when being designated as of described control module switched to the indication of down direction, the switching repeated direction was a down direction, when being designated as of described control module switched to the indication of up direction, the switching repeated direction was a up direction;
Described control module is used for parsing bus holding time information from the FLP that receives, and according to the bus holding time information that gets access to, determines to go up row bus holding time and following row bus holding time; When last row bus holding time finishes, send the indication that switches to down direction, when the row bus holding time finishes down, send the indication that switches to up direction.
The present invention also provides a kind of coaxial network system, can improve the performance in the message transmission.
In coaxial network system of the present invention, comprising: coaxial line terminal CLT and trunking, wherein, the quick connection pulse FLP that described CLT is used for will carrying by self physical layer bus holding time information sends to trunking; Trunking is used for parsing bus holding time information from the FLP that receives, and according to the bus holding time information that gets access to, determines to go up row bus holding time and following row bus holding time; When the row bus holding time finishes down, repeated direction is switched to up direction; When up holding time finishes, repeated direction is switched to down direction.
By such scheme as seen, the trunking that the invention belongs to physical chip just can know when repeated direction is adjusted into up direction clearly obtained bus holding time information by FLP after, when repeated direction is adjusted into down direction.After having determined repeated direction, trunking just can carry out correct information transfer between CLT and CNU in message transmitting procedure, the switching of repeated direction each time all need not the control of MAC layer chip, and message transmitting procedure can be finished between physical chip fully.Therefore, the present invention can reduce complicated operation degree, the raising processing speed of EPCN in message transmitting procedure that comprises trunking effectively, thereby improves the performance of EPCN.
And, because need not to participate in the repeated direction of trunking, MAC layer chip switch, therefore can the relatively low MAC chip of serviceability, thus can reduce the realization cost effectively.
Have, MAC layer chip among the present invention is owing to need not to participate in the repeated direction switching of trunking again, and its burden alleviates to some extent, therefore can avoid controlling the appearance of bottleneck effectively, and improves the reliability of EPCN.
Description of drawings
Fig. 1 is the structural representation of existing EPCN.
Fig. 2 is the exemplary process diagram of physical layer trunking direction changing method among the present invention.
Fig. 3 is the exemplary configurations schematic diagram of trunking of the present invention.
Fig. 4 is the flow chart of physical layer trunking direction changing method in the embodiment of the invention.
Fig. 5 is the waveform schematic diagram that connects pulse fast.
Fig. 6 is the form schematic diagram of message page coding and unformatted page or leaf coding.
Fig. 7 is the structural representation of embodiment of the invention trunking.
Fig. 8 is the structural representation of coaxial network system in the embodiment of the invention.
Embodiment
For making purpose of the present invention, technical scheme clearer, below with reference to the accompanying drawing embodiment that develops simultaneously, the present invention is described in further detail.
In order to improve the EPCN performance that comprises trunking, the present invention is before the message transmission between CLT and the CNU begins, carry out the physical layer auto-negotiation, promptly trunking obtains bus holding time information from the physical layer of CLT, according to the repeated direction of the bus occupied information decision that gets access to self.
Fig. 2 shows the exemplary process diagram of physical layer auto-negotiation method among the present invention.Referring to Fig. 2, this method comprises:
In step 201, receive the quick connection pulse (FLP) that comes from the CLT physical layer, from the FLP that receives, parse bus holding time information;
In step 202, switch the repeated direction of trunking according to bus holding time information.
The bus holding time information here can be one of following five types: one, go up row bus holding time information, two, following row bus holding time information, three, go up row bus holding time information and following row bus holding time information, four, up-downgoing bus holding time information and last row bus holding time information, five, up-downgoing bus holding time information and following row bus holding time information.Up-downgoing bus holding time information wherein is meant row bus holding time information and following row bus holding time information sum.When last row bus holding time was identical with following row bus holding time, bus holding time information can only be last row bus holding time information or following row bus holding time information; At last row bus holding time and following row bus holding time not simultaneously, the bus holding time here is not exactly one of above-mentioned third and fourth, five types.
Because bus holding time information can reflect that the uplink and downlink direction takies the time period of bus, the trunking that belongs to physical chip so is after having obtained bus holding time information, just can know when repeated direction is adjusted into up direction clearly, when repeated direction is adjusted into down direction.After having determined repeated direction, trunking just can carry out correct information transfer between CLT and CNU in message transmitting procedure, the switching of repeated direction each time all need not the control of MAC layer chip, and message transmitting procedure can be finished between physical chip fully.Therefore, the present invention can reduce complicated operation degree, the raising processing speed of EPCN in message transmitting procedure that comprises trunking effectively, thereby improves the performance of EPCN.And, because need not to participate in the repeated direction of trunking, MAC layer chip switch, therefore can the relatively low MAC chip of serviceability, thus can reduce the realization cost effectively.Have, MAC layer chip among the present invention is owing to need not to participate in the repeated direction switching of trunking again, and its burden alleviates to some extent, therefore can avoid controlling the appearance of bottleneck effectively, and improves the reliability of EPCN.
Fig. 3 shows the exemplary configurations schematic diagram of the trunking of carrying out above-mentioned auto-negotiation operation among the present invention.Referring to Fig. 3, this trunking comprises: interface module and control module.Interface module wherein is used for described interface module and is used to receive the FLP that comes from the CLT physical layer, and the FLP that receives is sent to control module, switches repeated direction under the indication of control module; Control module is used for parsing bus holding time information from the FLP that receives, and switches repeated direction according to bus holding time information indication interface module.
The present invention utilizes the FLP in the Ethernet auto-negotiation mechanism to come transfer bus holding time information, below by specific embodiment physical layer trunking direction handover scheme of the present invention is described.
Fig. 4 shows the flow chart of physical layer trunking direction changing method in the embodiment of the invention.Referring to Fig. 4, this flow process comprises:
In step 401～402, the MAC layer of CLT sends to the physical layer of this CLT with bus holding time information, and physical layer as negotiation information, is encapsulated in the bus holding time information that receives among the FLP, this FLP is sent to the physical layer of trunking.
For EPCN, the MAC layer of CLT can get access to the control information relevant with message transmission as main manager.In order to guarantee the auto-negotiation of physical layer, the MAC layer of CLT is handed down to the physical layer of CLT with bus holding time information here, and bus holding time information is one of aforesaid five types.
In the auto-negotiation mechanism of Ethernet, include a series of among the FLP by connecting clock/data sequence that the conformability test pulse is formed.Fig. 5 shows the waveform schematic diagram of quick connection pulse.Referring to Fig. 5, clock pulse is represented in the pulse that has oblique line, not with the pulse meter registration of oblique line according to pulse, each data pulse all is positioned at the mid point of adjacent two clock pulse, comprises 17 clock pulse and 16 data pulses among each FLP.When positive pulse appearred in the position of data pulse, expression digital coding at this moment was 1; When pulse did not appear in the position of data pulse, then expression digital coding at this moment was 0.So just can by D0 to D15 totally 16 data bit represent negotiation information, promptly negotiation information is 16 bits.
The negotiation information of this 16 bit can be base page code word or next page number word, and base page code word wherein selects territory, technology ability field, remote error territory (RF), Acknowledge (ACK) and following one page territory (NP) in interior essential information in order to carry such as comprising; Next page number word is in order to carry the additional information except that essential information.
For the base page code word, if one page function under the equipment support that participates in consulting, then the NP of base page code word is set to 1; Otherwise if do not support down one page function, then NP is set to 0.The bus holding time information that in the present embodiment CLT physical layer and trunking physical layer need be consulted is carried in next page number word, so the NP value of base page code word is 1.
Next page number word comprises two kinds of codings: message page coding and unformatted page or leaf coding.Wherein, the message page coding is used for showing type of message; The unformatted page or leaf sends after being coded in the message page coding, is used for representing the message content of this message page.Fig. 6 shows the form schematic diagram of message page coding and unformatted page or leaf coding.As shown in Figure 6, the message page coding comprises that message field (Message Code Field), bit replace territory (Toggle), Acknowledge 2 (ACK2), message page territory (Message Page), Acknowledge and following one page territory etc.Message field is 11 bits, represents with M0 to M10, and these 11 bits can be represented 2048 type of messages.Bit replaces the territory and is positioned at after the message field, represents with T, and its value is the non-value that bit replaces the territory in the page up coding, and it is the value that bit replaces the territory in the base page that the bit of the 1st next page number word replaces the territory.The message that local terminal sends be carried out in Acknowledge 2 expression opposite ends can, and this territory value is to represent and can't carry out in 0 o'clock, and value is to represent and can carry out in 1 o'clock.The message page territory is represented as MP in the drawings, and next page number word at its expression place is message page coding or unformatted page or leaf coding, and value is to be expressed as the message page coding at 1 o'clock, is to be expressed as unformatted message page coding at 0 o'clock.Acknowledge represents that the opposite end has received next page number word that local terminal sends.Whether following one page territory of representing with NP indicates and exists continued page to send, and value is to represent to have continued page to send at 1 o'clock, is to represent not have continued page at 0 o'clock will send.Unformatted page or leaf coding only is with the difference of message page coded format: comprise the unformatted territory of bearer messages data message in the unformatted page or leaf coding, i.e. and U0 to U10, and do not comprise message field.
Present embodiment is when sending bus holding time information the physical layer of trunking to by the physical layer of CLT, the value of the message field of message page coding is made as the value of bus holding time information type correspondence, for example, with 10 type of messages of representing to carry next page number word correspondence of bus holding time information, the message field of message page coding is 0000000000001010 so; Then, with the value of bus holding time information value as unformatted territory in the unformatted page or leaf.When last row bus holding time information and following row bus holding time not simultaneously, can encode transfer bus holding time information by two unformatted pages or leaves, and can set in advance the corresponding bus holding time information type of each unformatted page or leaf coding, for example: first unformatted page or leaf coding transmission be up-downgoing bus holding time information, second unformatted page or leaf coding transmission be to go up row bus holding time information, can certainly be opposite order.
By FLP when the physical layer of trunking sends bus holding time information, at first send the base page code word, and then send the message page coding, then be at least one unformatted page or leaf coding.
In addition, can set in advance transmission time started point in the present embodiment, and be notified to the physical layer of physical layer, trunking and the CNU of CLT; In another case, if trunking is not known transmission time started point in advance, then can utilize a unformatted page or leaf to encode again and carry this transmission time started dot information.
In step 403, the physical layer of trunking is resolved the FLP that receives, and obtains bus holding time information.
In this step, the physical layer of trunking is after receiving the FLP that comes from the CLT physical layer, search the message page coding of bus holding time information type from the FLP that receives, the unformatted page or leaf coding after being arranged in this message page coding that finds obtains bus holding time information.Further, if comprise transmission time started point in the unformatted page or leaf coding, then this step can also parse transmission time started point.
In step 404, determine to go up row bus holding time and following row bus holding time according to bus holding time information, and the repeated direction of trunking is switched.
When the physical layer of relaying equipment only parses row bus holding time information or following row bus holding time information from FLP, it is identical to show that the uplink and downlink direction takies the time length of physical bus, then determines to go up row bus holding time and following row bus holding time and is equal to value in the bus holding time information that parses.If the physical layer of trunking parses up-downgoing bus holding time information and goes up row bus holding time information or following row bus holding time information from FLP, then can obtain down the row bus holding time or go up the row bus holding time by both are got difference.If the physical layer of trunking parses row bus holding time information and following row bus holding time information from FLP, then can directly obtain row bus holding time and following row bus holding time.
After having determined uplink and downlink bus holding time, just can begin to calculate uplink time period and downlink transfer time period from message transmission time started point.For example: going up the row bus holding time is 5ms, following row bus holding time is 10ms, with uplink to start with, 5ms from the some beginning of message transmission time started is the uplink time period so, 10ms then is the downlink transfer time period, the rest may be inferred, and uplink time period and downlink transfer time period alternately occur.
When determining repeated direction,, repeated direction is adjusted into from the CNU reception, sends to CLT for the uplink time period; For the downlink transfer time period, repeated direction is adjusted into from the CLT reception, sends to CNU.
During concrete the application, timer can be set in trunking, give this timer with the value assignment of last row bus holding time and following row bus holding time, so that in message transmitting procedure, repeated direction is switched.
So far, the physical layer trunking direction handoff procedure in the end present embodiment.
After this, in message transmitting procedure, after trunking switched repeated direction, CLT sent to trunking with downlink information, and trunking is transmitted to all CNU again; Perhaps, CNU sends to trunking with uplink information, and trunking is transmitted to CLT again.
Fig. 7 shows the structural representation of embodiment of the invention trunking.Referring to Fig. 7, this figure has carried out refinement to the trunking shown in Fig. 2 and has replenished.
Interface module in the present embodiment trunking comprises CLT port and CNU port, the CLT port is used for carrying the FLP of bus holding time information from the physical layer reception of CLT, and to the control module transmission, and be used under the indication of control module, switching to accepting state or switching to transmit status from accepting state from transmit status; The CNU port is used for switching to accepting state or switching to transmit status from accepting state from transmit status under the indication of control module.
Control module among Fig. 7 comprises control unit and clock unit.
Control unit is used to receive the FLP that carries bus holding time information, determine to go up row bus holding time and following row bus holding time according to bus holding time information, the determined row bus holding time of going up is notified to clock unit with following row bus holding time; Send the timing instruction to clock unit, during the row bus holding time finishes on receiving the expression that comes from clock unit notice, send to interface module and to switch to the indication that receives, sends to coaxial network unit CNU from CLT, during the row bus holding time finishes under receiving the expression that comes from clock unit notice, send the indication that receives, sends to CLT from CNU to interface module.More specifically say, during the row bus holding time begins under receiving the expression that comes from clock unit notice, send the indication that switches to accepting state to the CLT port, and send the indication that switches to transmit status to the CNU of interface module port; During the row bus holding time begins on receiving the expression that comes from clock unit notice, send the indication that switches to transmit status to the CLT port, and send the indication that switches to accepting state to the CNU port.
Control unit can also receive transmission time started point, and arrives this transmission time started during point, and the notice clock unit picks up counting.
Clock unit carries out timing according to last row bus holding time that comes from control module and following row bus holding time, when last row bus holding time or following row bus holding time end, and the notice control module.
Clock unit comprises row clock and following row clock, and only need are in advance to getting final product the time-count cycle of last row clock and descending clock setting correspondence for control unit at this moment, and after this these two clocks just can receive timely instruction back according to carrying out timing time-count cycle.Specifically, last row clock carries out timing according to last row bus holding time that comes from control unit and timing instruction, and row bus holding time end on time-count cycle Inform when done control unit; Following row clock carries out timing according to following row bus holding time that comes from control unit and timing instruction, and the row bus holding time finishes under time-count cycle Inform when done control unit.Correspondingly, after the control unit notice that the row bus holding time finishes on receiving, row clock sends the timing instruction downwards; After receiving the notice that the row bus holding time finishes down, upwards row clock sends the timing instruction.
Certainly, the clock unit in the present embodiment can only comprise a clock, if go up row bus holding time and following row bus holding time not simultaneously so, control unit all needs at every turn and will inform clock unit time-count cycle.
Fig. 8 shows the coaxial network system of the trunking that comprises Fig. 7.Referring to Fig. 8, this system comprises: CLT and trunking.Wherein, CLT sends to trunking by the quick connection pulse FLP that self physical layer will carry bus holding time information, trunking parses bus holding time information from the FLP that receives, according to the bus holding time information that parses, repeated direction is switched.Further, this system also comprises CNU, the repeated direction of trunking be from CNU receive, when CLT sends, CNU sends to trunking with uplink information; In repeated direction is from the CLT reception, when CNU sends, and receives the downlink information that comes from trunking.Correspondingly, trunking carries out the transfer of information between CLT and CNU.And CLT can also be from the CNU reception, when CLT sends in the repeated direction of trunking, receives the upstream data that comes from trunking; In repeated direction is from the CLT reception, when CNU sends, and sends downlink data to trunking.
Trunking can also can be used as independent entity and be present among the EPCN in the distributor/splitter between CLT and the CNU.
The above only is preferred embodiment of the present invention, and is in order to restriction the present invention, within the spirit and principles in the present invention not all, any modification of being made, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (11)
1. physical layer trunking direction changing method is characterized in that this method comprises:
Reception comes from the quick connection pulse FLP of coaxial line terminal CLT physical layer, parses bus holding time information from the FLP that receives; According to the bus holding time information that gets access to, determine to go up row bus holding time and following row bus holding time; When down the row bus holding time finishes, the repeated direction of described trunking is switched to up direction; When up holding time finishes, the repeated direction of described trunking is switched to down direction.
2. the method for claim 1 is characterized in that, the described bus holding time information that parses from the FLP that receives is:
Search the message page coding of bus holding time information type from the FLP that receives, the unformatted page or leaf coding after being arranged in the message page coding that finds obtains bus holding time information.
3. method as claimed in claim 2 is characterized in that, after the FLP that described reception CLT physical layer sends, further comprises: parse transmission time started point from unformatted page or leaf coding;
Switch before the repeated direction of trunking, further comprise: carry out timing with following row bus holding time according to described transmission time started point that parses and the described row bus holding time of going up.
4. the method for claim 1 is characterized in that, this method further comprises: set in advance transmission time started point;
Before the repeated direction of described switching trunking, further comprise: carry out timing with following row bus holding time according to transmission time started point that sets in advance and the described row bus holding time of going up.
5. as any described method in the claim 1 to 4, it is characterized in that, described bus holding time information is: go up row bus holding time information, perhaps descend row bus holding time information, perhaps up-downgoing bus holding time information and last row bus holding time information, perhaps up-downgoing bus holding time information and following row bus holding time information perhaps go up row bus holding time information and following row bus holding time information.
6. a trunking is characterized in that, this trunking comprises: interface module and control module, wherein,
Described interface module is used to receive the quick connection pulse FLP that comes from coaxial line terminal CLT physical layer, the FLP that receives is sent to described control module, when being designated as of described control module switches to the indication of down direction, the switching repeated direction is a down direction, when being designated as of described control module switched to the indication of up direction, the switching repeated direction was a up direction;
Described control module is used for parsing bus holding time information from the FLP that receives, and according to the bus holding time information that gets access to, determines to go up row bus holding time and following row bus holding time; When last row bus holding time finishes, send the indication that switches to down direction, when the row bus holding time finishes down, send the indication that switches to up direction.
7. trunking as claimed in claim 6 is characterized in that, described up direction is: receive, send to CLT from coaxial network unit CNU, described down direction is: receive, send to CNU from CLT; Described control module comprises: control unit and clock unit, wherein,
Described control unit is used to receive the FLP that carries described bus holding time information, determine to go up row bus holding time and following row bus holding time according to bus holding time information, the determined row bus holding time of going up is notified to clock unit with following row bus holding time; Send the timing instruction to clock unit, during the row bus holding time finishes on receiving the expression that comes from clock unit notice, send to interface module and to switch to the indication that receives, sends to CNU from CLT, during the row bus holding time finishes under receiving the expression that comes from clock unit notice, send the indication that receives, sends to CLT from CNU to interface module;
Described clock unit carries out timing according to last row bus holding time that comes from control module and following row bus holding time, when last row bus holding time or following row bus holding time end, and the notice control unit.
8. trunking as claimed in claim 7 is characterized in that, described control unit further receives transmission time started point from described CLT physical layer, and arrives this transmission time started during point, and the notice clock unit picks up counting.
9. as claim 7 or 8 described trunkings, it is characterized in that described control unit further will be notified to described clock unit time-count cycle.
10. as any described trunking in the claim 6 to 8, it is characterized in that described interface module comprises: CLT port and coaxial network unit CNU port, wherein,
Described CLT port is used for carrying the FLP of bus holding time information from described CLT physical layer reception, and send this FLP, and under the indication of described control module, switch to accepting state or switch to transmit status from accepting state from transmit status to control module;
Described CNU port is used for switching to accepting state or switching to transmit status from accepting state from transmit status under the indication of described control module.
11. a coaxial network system is characterized in that, this system comprises: coaxial line terminal CLT and trunking, wherein,
The quick connection pulse FLP that described CLT is used for will carrying by self physical layer bus holding time information sends to trunking;
Trunking is used for parsing bus holding time information from the FLP that receives, and according to the bus holding time information that gets access to, determines to go up row bus holding time and following row bus holding time; When the row bus holding time finishes down, repeated direction is switched to up direction; When up holding time finishes, repeated direction is switched to down direction.
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| CN101442457A (en) | 2009-05-27 |
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