CN101635712A - Single fiber data communication method based on FSK modulation demodulation mode - Google Patents
Single fiber data communication method based on FSK modulation demodulation mode Download PDFInfo
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Abstract
The invention discloses a single fiber data communication method based on an FSK modulation demodulation mode. The method comprises the following steps: 1. detecting whether any data need to be sent by a data communication unit when the unit is in data receiving state in the case of no data communication state, if yes, turning to 6, or turning to 2; 2. entering an FSK signal data interception state, if no FSK signal data is intercepted, turning to 1, or turning to 3; 3. performing synchronous guide string detection on the FSK signal data, if requirement is not met, giving up the interception, returning to 1, or performing FSK data receiving; 4. starting a timer 1 after a frame of the FSK data is received, de-framing to take out message layer information content and sending the content to a system host computer of a local terminal; 5. when the time of the timer 1 expires, returning to 1; 6. entering a data transmission state, performing transmission from framing to an opposite terminal; and 7.entering the interception state after the frame is transmitted, and starting a timer 2; and 8. when the time of the timer 2 expires, returning to 1. The method has the advantages of high data transmission efficiency and low cost.
Description
Technical field
The present invention relates to data communication transmission, specifically be meant a kind of single fiber data communication method based on FSK (Frequency-shiftkeying, frequency shift keying) modulation demodulation system.
Background technology
As shown in Figure 1, existing optical fiber repeater system comprises the system host of relay and the system host of capped end, and system host is that data are initiated and the final unit of Data Receiving processing in the optical fiber repeater system.The relay system host is specially the relaying terminal, and the capped end system host is specially the covering terminal.Adopt optical fiber to carry out data communication and the transmission of RF (radio frequency) signal between relaying terminal and the covering terminal as communication link.In order to save cost, the relaying terminal often adopts single fiber to link to each other with covering terminal, specifically is that relaying terminal and covering terminal respectively link to each other with a data communication units, and the data communication units at two ends links to each other by single fiber.
The data that described data communication units is used for the local terminal system host is transmitted encapsulate according to the fsk data frame format, send to the opposite end then; The fsk data frame that sends over for the opposite end receives and separates frame according to the fsk data frame format, and the message layer information content of taking out wherein sends to the local terminal system host, thereby has realized the transparent forwarding of data; Then do not transmit for the control command that the local terminal system host sends over, and just unit itself is carried out parameter configuration.In other words, the optical fiber repeater system adopts the command transfer passage to transmit to control command, adopts transparent transmission channel to transmit to data.
As shown in Figure 2, the half-duplex mode of question-response is adopted in data communication between relaying terminal and the covering terminal usually, have only the relaying terminal could initiatively send data, cover terminal and can only receive data passively, cover terminal only receiving permission that the relaying terminal transmits when sending the order of data, just can carry out the transmission of data.And the relay data communication units must could send the next frame data after the response that receives the opposite end after sending frame data.Have a strong impact on the data transmission efficiency of system thus, when unusual conditions such as error code occurring when data communication, caused the conflict of data transmit-receive intercommunication and not smooth easily.
For addressing the above problem, traditional way is by increasing the optical fibre channel between relaying terminal and the covering terminal, generally be that the continuous pair optical fiber that change into of single fiber are linked to each other, one road optical fiber is as the data transmission path, one the tunnel as data acquisition channel, can realize the full duplex data communication between relaying terminal and the covering terminal thus, this has not only improved data transmission efficiency, also solved by the unusual problems such as conflict that cause of data communication simultaneously, but owing to increased by one road optical fiber, corresponding opto-electronic conversion and modulation module also need corresponding increase by a tunnel, have increased system cost thus greatly, are unfavorable for applying.
Along with increasing fiber products by large scale application, relaying terminal and the contradiction that covers between performance such as data transmission efficiency between the terminal and the price just seem particularly outstanding, press for and find data communications method a kind of economy, that have the efficient data efficiency of transmission.
Summary of the invention
Purpose of the present invention is intended to overcome the shortcoming and defect of above-mentioned prior art, and a kind of single fiber data communication method based on the FSK modulation demodulation system is provided, and the inventive method is the data transmission efficiency height not only, and system cost is low.
Purpose of the present invention is achieved through the following technical solutions: a kind of single fiber data communication method based on the FSK modulation demodulation system comprises the steps:
(1) under system's free of data communications status, data communication units all is in data receiving state, and whether detecting unit has data to need to send, and needs to send if detected data, then enters step (6) immediately, if free of data needs to send, then enters step (2);
(2) data communication units enters the fsk signal data and intercepts state, intercepts the fsk signal data on the communication link, if do not listen to the fsk signal data, then turns back to step (1); If listen to the fsk signal data, then enter step (3);
(3) data communication units is carried out the detection of fsk signal data sync guiding string, if detected fsk signal data sync guiding string does not meet the demands, data communication units is abandoned these fsk signal data and intercepted, and turns back to step (1); If when detected fsk signal data sync guiding string met the demands, data communication units was carried out fsk data and is received;
(4) after data communication units is received a frame fsk data, start timer 1 (TD1), this fsk data frame that will receive is simultaneously separated frame, and the taking-up message layer information content wherein sends to the system host of local terminal;
(5) when being timed to of timer 1 (TD1), turn back to step (1);
(6) data communication units enters the data transmit status, and the packet that the local terminal system host is sended over carries out framing by the fsk data frame format, and sends the fsk data frame to the opposite end;
(7) after data communication units sends this fsk data frame, enter the fsk signal data immediately and intercept state, start timer 2 (TD2) simultaneously;
(8) when being timed to of timer 2 (TD2), data communication units turns back to step (1).
In the said method, when data communication units was in data receiving state, if no fsk signal data on the communication link, then the fsk data that listens to of data communication units was Binary Zero; In case the fsk data that data communication units listens to is a binary one, just data communication units listens to the fsk signal data, and data communication units is carried out fsk signal data sync guiding string immediately and detected.
In order better to realize the object of the invention, in the said method, the described data communication units of step (3) is carried out fsk signal data sync guiding string and is detected, and concrete steps are as follows:
(3.1) data communication units is intercepted the fsk signal data continuously, and the fsk data that listens to continuously when data communication units is the quantity of binary one when enough, and data communication units is intercepted FSK binary data 0 and the data 1 that replace continuously;
(3.2) fsk data that listens to continuously when data communication units is the quantity of Binary Zero alternately and binary one when enough, and data communication units is intercepted continuous FSK binary data 0;
(3.3) fsk data that listens to continuously when data communication units is the quantity of Binary Zero when enough, and data communication units is intercepted continuous FSK binary data 1;
(3.4) fsk data that listens to continuously when data communication units is the quantity of binary one when enough, shows that detected fsk signal data sync guiding string meets the demands.
In the concrete operations that above-mentioned fsk signal data sync guiding string detects, judge the described fsk data that listens to continuously be the quantity of binary one, fsk data for the quantity of Binary Zero alternately and binary one, quantity that fsk data is Binary Zero, quantity that fsk data is binary one whether enough, be specifically to set a threshold value according to these characteristics of optical fiber repeater system own, when all kinds quantity of the above-mentioned fsk data that listens to continuously reaches threshold value, just be judged to be enough.
When data communication units in step (3.1), (3.2), (3.3) or listen to the fsk signal data in (3.4) when not meeting the demands, also the fsk data that promptly listens to continuously in step (3.1) is that the quantity of binary one does not meet the demands, the fsk data that listens to continuously in step (3.2) is that the Binary Zero alternately and the quantity of binary one do not meet the demands, the fsk data that listens to continuously in step (3.3) is that the quantity of Binary Zero does not meet the demands, or the fsk data that listens to continuously in step (3.4) is the quantity of binary one when not meeting the demands, and all is considered as fsk signal data sync guiding string and do not meet the demands.
In the said method, described fsk data frame comprises synchronous guiding string, information type, gap marker, message length, the message layer information content and finishes string.
The effect of each parameter of above-mentioned composition fsk data frame is specific as follows:
Described synchronous guiding string is used for the filtering link noise, and it is synchronous to set up data communication, is used for indication after setting up synchronously and begins to receive data;
Described message length is used to indicate the byte number sum of the message layer information content;
Described message layer information content length is controlled by message length, and when message layer information content overlength, data communication units is carried out the framing transmission after can automatically the long data bag being split as the packet that meets the message length requirement;
Described information type is used for indicating the attribute of the current fsk data frame message layer information content, and information type such as comprises inquiry, is provided with and replys at type, can expand according to actual needs;
Described gap marker is used to indicate the type of data transmission channel, and data transmission channel comprises two types of command transfer passage and transparent transmission channels;
Described end string is used to guarantee the reliable transmission of Frame tail data, is made up of some byte spcial characters.
In the said method, the timing index of described timer 1 (TD1) receives that according to communication unit a fsk data frame to the stand-by period that allows to send the fsk data frame, is used to guarantee that the opposite end data communication units transfers data receiving state to by the data transmit status.
In the said method, the timing index of described timer 2 (TD2) sends a fsk data frame to the stand-by period that can send next fsk data frame according to communication unit, the timing of timer 2 (TD2) is a random number, be used for data collision detection, guarantee that data communication units realizes accurate full-duplex communication, when data collision occurring, can recover rapidly simultaneously.
The present invention compared with prior art, have following advantage and beneficial effect: the inventive method has realized the single fiber quasi-duplex data communication mode based on the FSK modulation demodulation system, system's each node (system host) all can be used as initiatively initiator of data, promoted data transmission efficiency greatly, simultaneously, when data collision, by the bus arbitration mechanism that adopts timing mode data communication can be recovered rapidly, by when forming Frame, introducing gap marker, indicate the type of data transmission channel, introduce the notion of data transparent transmission channel and command transfer passage, to realize transparent data transmission and to the parameter controlled function of unit, thereby be implemented under the situation of single fiber transfer of data efficiently, this method realizes simple, easy to use, cost is low.
Description of drawings
Fig. 1 is that the data communication units of traditional fiber repeater is used block diagram;
Fig. 2 is the flow chart that adopts the half-duplex operation mode of question-response in the prior art between data communication units and the data communication units;
Fig. 3 is a kind of specific implementation flow chart of realizing the accurate full-duplex communication mode of data between data communication units of the present invention and the data communication units.
Embodiment
Below in conjunction with embodiment and accompanying drawing, the present invention is described in further detail, but embodiments of the present invention are not limited thereto.
Generally speaking, method of the present invention realizes in the data communication units in the optical fiber repeater system that mainly data communication units is as the transparent forwarding passage of data between relay and the optical fiber capped end.The present invention is directed to the characteristics and the restriction of existing fiber direct discharging station, realized the accurate full duplex data communication between the data communication units on current general half-duplex data communication system resource, each cell node in the simultaneity factor all can be used as initiatively initiator of data.
A kind of single fiber data communication method based on the FSK modulation demodulation system comprises the steps:
(1) under system's free of data communications status, data communication units all is in data receiving state, and whether detecting unit has data to need to send, there are data to need to send if detect local terminal, then enter step (6) immediately,, then enter step (2) if free of data needs to send;
(2) data communication units enters the fsk signal data and intercepts state, intercepts the fsk signal data on the communication link, if do not listen to the fsk signal data, then turns back to step (1); If listen to the fsk signal data, then enter step (3);
(3) data communication units is carried out the detection of fsk signal data sync guiding string, if detected fsk signal data sync guiding string does not meet the demands, data communication units is abandoned these fsk signal data and intercepted, and turns back to step (1); If when detected fsk signal data sync guiding string met the demands, data communication units was carried out fsk data and is received;
(4) after data communication units is received a frame fsk data, start TD1, this fsk data frame that will receive is simultaneously separated frame, and the taking-up message layer information content wherein sends to the system host of local terminal;
(5) when being timed to of TD1, turn back to step (1);
(6) when the local terminal system host has data to send, data communication units will detect local terminal has data to send, data communication units enters the data transmit status, and the packet that the local terminal system host is sended over carries out framing by the fsk data frame format, and sends the fsk data frame to the opposite end;
(7) after data communication units sends this fsk data frame, enter the fsk signal data immediately and intercept state, start TD2 simultaneously;
(8) when being timed to of TD2, data communication units turns back to step (1).
In the said method, when data communication units was in data receiving state, if no fsk signal data on the communication link, then the fsk data that listens to of data communication units was Binary Zero; In case the fsk data that data communication units listens to is a binary one, just data communication units listens to the fsk signal data, and data communication units is carried out fsk signal data sync guiding string immediately and detected.
In order better to realize present embodiment, in the said method, the described data communication units of step (3) is carried out fsk signal data sync guiding string and is detected, and concrete steps are as follows:
(3.1) data communication units is intercepted the fsk signal data continuously, and the fsk data that listens to continuously when data communication units is the quantity of binary one when enough, and data communication units is intercepted FSK binary data 0 and the data 1 that replace continuously;
(3.2) fsk data that listens to continuously when data communication units is the quantity of Binary Zero alternately and binary one when enough, and data communication units is intercepted continuous FSK binary data 0;
(3.3) fsk data that listens to continuously when data communication units is the quantity of Binary Zero when enough, and data communication units is intercepted continuous FSK binary data 1;
(3.4) fsk data that listens to continuously when data communication units is the quantity of binary one when enough, shows that detected fsk signal data sync guiding string meets the demands.
In the concrete operations that above-mentioned fsk signal data sync guiding string detects, judge the described fsk data that listens to continuously be the quantity of binary one, fsk data for the quantity of Binary Zero alternately and binary one, quantity that fsk data is Binary Zero, quantity that fsk data is binary one whether enough, be specifically to set a threshold value according to these characteristics of optical fiber repeater system own, when all kinds quantity of the above-mentioned fsk data that listens to continuously reaches threshold value, just be judged to be enough.
When data communication units in step (3.1), (3.2), (3.3) or listen to the fsk signal data in (3.4) when not meeting the demands, also the fsk data that promptly listens to continuously in step (3.1) is that the quantity of binary one does not meet the demands, the fsk data that listens to continuously in step (3.2) is that the Binary Zero alternately and the quantity of binary one do not meet the demands, the fsk data that listens to continuously in step (3.3) is that the quantity of Binary Zero does not meet the demands, or the fsk data that listens to continuously in step (3.4) is the quantity of binary one when not meeting the demands, and all is considered as fsk signal data sync guiding string and do not meet the demands.
In the said method, described fsk data frame comprises synchronous guiding string, information type, gap marker, message length, the message layer information content and finishes string.
The effect of each parameter of above-mentioned composition fsk data frame is specific as follows:
Described synchronous guiding string is used for the filtering link noise, and it is synchronous to set up data communication, is used for indication after setting up synchronously and begins to receive data;
Described message length is used to indicate the byte number sum of the message layer information content;
Described message layer information content length is controlled by message length, and when message layer information content overlength, data communication units is carried out the framing transmission after can automatically the long data bag being split as the packet that meets the message length requirement;
Described information type is used for indicating the attribute of the current fsk data frame message layer information content, and information type such as comprises inquiry, is provided with and replys at type, can expand according to actual needs;
Described gap marker is used to indicate the type of data transmission channel, and data transmission channel comprises two types of command transfer passage and transparent transmission channels;
Described end string is used to guarantee the reliable transmission of Frame tail data, is made up of some byte spcial characters.
In the said method, the timing index of described TD1 receives that according to communication unit a fsk data frame to the stand-by period that allows to send the fsk data frame, is used to guarantee that the opposite end data communication units transfers data receiving state to by the data transmit status.
In the said method, the timing index of described TD2 sends a fsk data frame to the stand-by period that can send next fsk data frame according to communication unit, the timing of TD2 is a random number, be used for data collision detection, guarantee that data communication units realizes accurate full-duplex communication, when data collision occurring, can recover rapidly simultaneously.
Embodiment one
As shown in Figure 3, be a kind of specific implementation method of a kind of single fiber data communication method based on the FSK modulation demodulation system of the present invention, its step is as follows:
1, under system's free of data communications status, data communication units 1 and data communication units 2 all are in data receiving state, and whether detecting unit itself has data to need to send respectively:
1.1 because system host 1 has data to send, the packet 1 that data communication units 1 receiving system main frame 1 is sent, after carrying out respective handling, having determined data needs to send, then enter the data transmit status immediately, the packet 1 that system host 1 is sended over carries out framing by the fsk data frame format, sends fsk data frame 1 to data communication units 2;
1.2 do not need to send because data communication units 2 has detected data, intercept state so enter the fsk signal data, intercept the fsk signal data on the communication link, owing to listen to the fsk signal data that data communication units 1 transmits, data communication units 2 is carried out fsk signal data sync guiding string and is detected, data communication units 2 detected fsk signal data sync guiding strings meet the demands, and data communication units 2 receives the fsk data frame 1 that data communication units 1 transmits;
2, after data communication units 2 is received fsk data frame 1, start TD1, this fsk data frame 1 that to receive is simultaneously separated frame, the message layer information content of taking out wherein sends to system host 2, when being timed to of TD1, data communication units 2 detects unit itself does not have data to need to send, and intercepts state so enter the fsk signal data;
3, after data communication units 1 sends fsk data frame 1, enter the fsk signal data immediately and intercept state, start TD2 simultaneously, do not transmit the fsk signal data owing to listen to the opposite end, so, when being timed to of TD2, data communication units 1 turns back to step (1), and at this moment, data communication units 1 has detected data to be needed to send, then immediately set by step 1.1 operation send fsk data frame n to data communication units 2, and data communication units 2 set by step 1.2 operation receive fsk data frame n;
3, after data communication units 2 is received fsk data frame n, start TD1, this fsk data frame n that will receive simultaneously separates frame, the message layer information content of taking out wherein sends to system host 2, when being timed to of TD1, whether data communication units 2 has data to need to send to step (1) detecting unit itself, because system host 2 has data to send, the packet n+1 that data communication units 2 receiving system main frames 2 are sent, after carrying out respective handling, having determined data needs to send, then enter the data transmit status immediately, the packet n+1 that system host 2 is sended over carries out framing by the fsk data frame format, sends fsk data frame n+1 to data communication units 2, and data communication units 1 set by step 1.2 operation receive fsk data frame n+1.
The foregoing description is a preferred implementation of the present invention; but embodiments of the present invention are not limited by the examples; 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 (4)
1, a kind of single fiber data communication method based on the FSK modulation demodulation system is characterized in that, comprises the steps:
(1) under system's free of data communications status, data communication units all is in data receiving state, and whether detecting unit has data to need to send, there are data to need to send if detect local terminal, then enter step (6) immediately,, enter step (2) if free of data needs to send;
(2) data communication units enters the fsk signal data and intercepts state, intercepts the fsk signal data on the communication link, if do not listen to the fsk signal data, then turns back to step (1); If listen to the fsk signal data, then enter step (3);
(3) data communication units is carried out the detection of fsk signal data sync guiding string, if detected fsk signal data sync guiding string does not meet the demands, data communication units is abandoned these fsk signal data and intercepted, and turns back to step (1); If when detected fsk signal data sync guiding string met the demands, data communication units was carried out fsk data and is received;
(4) after data communication units is received a frame fsk data, start timer 1, this fsk data frame that will receive is simultaneously separated frame, and the taking-up message layer information content wherein sends to the system host of local terminal;
(5) when being timed to of timer 1, turn back to step (1);
(6) data communication units enters the data transmit status, and the packet that the local terminal system host is sended over carries out framing by the fsk data frame format, and sends the fsk data frame to the opposite end;
(7) after data communication units sends this fsk data frame, enter the fsk signal data immediately and intercept state, start timer 2 simultaneously;
(8) when being timed to of timer 2 (TD2), data communication units turns back to step (1).
2, a kind of single fiber data communication method based on the FSK modulation demodulation system as claimed in claim 1 is characterized in that, the described data communication units of step (3) is carried out fsk signal data sync guiding string and detected, and concrete steps are as follows:
(3.1) data communication units is intercepted the fsk signal data continuously, and the fsk data that listens to continuously when data communication units is the quantity of binary one when enough, and data communication units is intercepted FSK binary data 0 and the data 1 that replace continuously;
(3.2) fsk data that listens to continuously when data communication units is the quantity of Binary Zero alternately and binary one when enough, and data communication units is intercepted continuous FSK binary data 0;
(3.3) fsk data that listens to continuously when data communication units is the quantity of Binary Zero when enough, and data communication units is intercepted continuous FSK binary data 1;
(3.4) fsk data that listens to continuously when data communication units is the quantity of binary one when enough, shows that detected fsk signal data sync guiding string meets the demands;
When data communication units listens to the fsk signal data when not meeting the demands in step (3.1), (3.2), (3.3) or (3.4), all be considered as fsk signal data sync guiding string and do not meet the demands.
3, a kind of single fiber data communication method based on the FSK modulation demodulation system as claimed in claim 1 or 2 is characterized in that: the described fsk data frame of forming by the fsk data frame format comprises synchronous guiding string, information type, gap marker, message length, the message layer information content and finishes string.
4, a kind of single fiber data communication method based on the FSK modulation demodulation system as claimed in claim 3 is characterized in that:
Described synchronous guiding string is used for the filtering link noise, and it is synchronous to set up data communication, is used for indication after setting up synchronously and begins to receive data;
Described message layer information content length is controlled by message length, and when message layer information content overlength, data communication units is carried out the framing transmission after automatically the long data bag being split as the packet that meets the message length requirement;
Described information type is used for indicating the attribute of the current fsk data frame message layer information content, and information type comprises query type, type and acknowledgement type are set;
Described gap marker is used to indicate the type of data transmission channel, and described data transmission channel comprises command transfer channel type and transparent transmission channel type;
Described end string is used to guarantee the reliable transmission of Frame tail data, is made up of some byte spcial characters.
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| CN111431605A (en) * | 2020-03-30 | 2020-07-17 | 阳光电源股份有限公司 | Data receiving and transmitting control method and application system thereof |
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| CN111431605A (en) * | 2020-03-30 | 2020-07-17 | 阳光电源股份有限公司 | Data receiving and transmitting control method and application system thereof |
| WO2021197044A1 (en) * | 2020-03-30 | 2021-10-07 | 阳光电源股份有限公司 | Data transceiving control method and application system therefor |
| CN111431605B (en) * | 2020-03-30 | 2021-12-10 | 阳光电源股份有限公司 | Data receiving and transmitting control method and application system thereof |
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