CN102916910A - Synchronous multiplexing method on basis of asynchronous system - Google Patents
Synchronous multiplexing method on basis of asynchronous system Download PDFInfo
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- CN102916910A CN102916910A CN2012104309392A CN201210430939A CN102916910A CN 102916910 A CN102916910 A CN 102916910A CN 2012104309392 A CN2012104309392 A CN 2012104309392A CN 201210430939 A CN201210430939 A CN 201210430939A CN 102916910 A CN102916910 A CN 102916910A
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Abstract
The invention provides a synchronous multiplexing method on the basis of an asynchronous system, which mainly solves the problem of implementing a synchronous multiplexer when a multiplexer cannot recover a timing signal from received group signals. According to the invention, a conventional mode that a conventional synchronous multiplexer multiplexes according to a time slot is changed, a frame transmission mode of the asynchronous system is introduced into the synchronous multiplexer and the multiplexing of data, voice and an Ethernet signal when a group line cannot transmit a synchronizing signal. According to the invention, the frame transmission mode is adopted and the transmission of different types of services is implemented; by utilizing frame padding, a slip code caused by different clock sources is effectively avoided; a dynamic multiplexing technology is adopted, the channel bandwidth is saved and the channel utilization rate is improved; the multiplexing of various types of data services with different rates can be implemented and the data occupies the group bandwidth according to an original rate; and an error-correcting code is added into a control/state field of a multiplexed frame, so that the misrepresentation of the integral frame, which is caused by the channel error code, is effectively avoided.
Description
Technical field
The present invention proposes a kind of synchronous subdivision based on asynchronous system and connect method, when it mainly solves multiplexer-demultiplexer and can't recover timing signal from the group signals that receives, realize the problem of synchronous multiplexer-demultiplexer.
Background technology
Because wireless channel is so that multiplexer-demultiplexer can't be from recovering stable clock through the group signals of wireless transmission.Group road clock only can be used in and receives group's circuit-switched data, can not be as the work clock of equipment.If multiplexer-demultiplexer adopts accurate method of synchronization work, can cause group road slip, affect communication quality.
The multiplexer-demultiplexer type of service comprises data, speech and Ethernet service.Wherein data-interface is multichannel, and speed is that 0～115.2kbps is optional.Line interface is the RS422 interface, and speed is 2Mbps.If connect according to traditional time slot subdivision, to carry out aftertreatment for data, need simultaneously the mutual or indication field of signaling procedure to indicate the data type of multiple connection and shared bit number.
The present invention introduces synchronous multiplexer-demultiplexer with the bag transmission technology of asynchronous system, and data are with group road speed rates, and the reciprocal process between multiplexer-demultiplexer is simplified in the flexibility that can improve transfer of data; By inserting infilled frame, make the multiplexer-demultiplexer that is operated in accurate synchronous mode, avoid group generation of road slip.
Summary of the invention
The object of the invention is to avoid in the above-mentioned background technology provides a kind of synchronous subdivision based on asynchronous system to connect method in the weak point of synchronous multiplexer-demultiplexer technology, satisfies the specification requirement that some characteristics of radio channels can't be realized the synchronous multiplexer-demultiplexer in the transmission situation of synchronizing signal.
The object of the present invention is achieved like this, and a kind of synchronous subdivision based on asynchronous system connects method, comprises multiple connection process and minute termination process, it is characterized in that comprising step:
The multiple connection process
(1) it is adaptive the business datum of each access to be carried out respectively interface;
(2) business datum after interface is adaptive is carried out buffer memory each professional reception in buffer area respectively, and according to the frame structure of multiple connection each business datum is formed respectively Frame;
(3) after Frame forms, send the transmission request signal to the multiple connection module;
(4) multiple connection module according to sending request signal, is taken out Frame from each professional reception the buffer area according to the multiple connection rule, sends from the form of line interface with synchronizing signal;
Divide termination process
(5) for the group signals that receives, at first take out receive data with receive clock and finish and receive adaptively, then the error correcting code of business type field detected data packet discarding that can not error correction;
(6) Demultiplexing module carries out the tap processing according to business type field, comprises abandoning infilled frame, the business datum in the business data frame is write respectively the transmission buffer area of each business;
(7) the business interface adaptation module is taken out business datum from sending buffer area, carry out interface adaptive after, business datum is sent respectively.
Wherein, the frame structure of the multiple connection in the step (2) is:
1. frame head: 1 byte is frame alignment signal;
2. indication field: 2 bytes, be used for control information transmission, comprise following content:
● type of service, 4bit;
● error correction coding, 4bit is the error correction coding to business type field, realizes 1bit error code correction among the 8bit, the error detection of 2bit error code;
● the indication of speech off-hook, maximum 8bit, the dislodging machine state of indication two wires speech;
3. data field, 61 bytes
The data field definition of different service types is different:
● speech and synchrodata: valid data account for 60 bytes, and the 1st byte is for filling word;
● asynchronous data: valid data district 60 bytes, the 1st byte are the asynchronous data Length Indication, and value is 1～60;
● Ethernet service: valid data account for 61 bytes;
● infilled frame: 61 bytes all are to fill word.
Wherein, described multiple connection rule is in the middle of the step (4): when group road band be wider than each access service bandwidth and the time, remaining bandwidth sends infilled frame; When group road bandwidth less than the bandwidth of each access service and the time, regularly insert infilled frame, the principle that takies remaining bandwidth according to Ethernet service is carried out multiple connection; When the multiple connection module is received the transmission request signal of multiple business simultaneously, finish multiple connection according to priority order from high to low, namely according to speech and synchrodata, asynchronous data, the order of Ethernet data.
The present invention compares background technology and has the following advantages:
1, owing to adopted the bag transmission technology of asynchronous system, adopt the method for inserting infilled frame when multiple connection, it is accurate synchronously the time just can to avoid multiplexer-demultiplexer to be operated in, because group road slip problem that frequency deviation of clock causes.
2, the present invention adopts the dynamic multiplexing technology, saves channel width, improves channel utilization.The present invention has adopted the bag transmission technology of asynchronous system, and the data service access for speech and synchrodata should business just can take group path channels after business enables; For asynchronous data traffic, when being arranged, data just can take group path channels, and the residue channel all for the transmission Ethernet service, can take full advantage of limited channel width like this, improves channel utilization.
3, the present invention can realize that the subdivision of multiple speed, polytype data service connects, and is 4.8kbps～19.2kbps for the possible transmission rate of synchrodata, and the possible transmission rate of asynchronous data is 4.8kbps～115.2kbps.Adopt the bag transmission technology of asynchronous system, can simplify subdivision and connect processing procedure and signalling interactive process.Data take group road bandwidth according to former speed, and the subdivision of having simplified synchrodata, asynchronous data connects flow process.
4, increase error correction coding in the control of multiple connection frame/mode field, effectively avoid because the misinformation of the whole frame that channel error code causes.Error correction coding can guarantee multiplexer-demultiplexer can be because of the error code of control/mode field with package forward to other interface.
Description of drawings
Fig. 1 is frame assumption diagram;
Fig. 2 is frame structure indicating field structure figure;
Fig. 3 is the type of service code pattern;
Fig. 4 is that subdivision meets realization flow figure.
Embodiment
The present invention adopts the synchronous subdivision based on asynchronous system to connect method, has separated when certainly multiplexer-demultiplexer can't recover timing signal from the group signals that receives, and realizes the problem of synchronous multiplexer-demultiplexer.
A kind of synchronous subdivision based on asynchronous system connects method, comprises multiple connection process and minute termination process, it is characterized in that comprising step:
The multiple connection process
(1) it is adaptive the business datum of each access to be carried out respectively interface;
(2) business datum after interface is adaptive is carried out buffer memory each professional reception in buffer area respectively, and according to the frame structure of multiple connection each business datum is formed respectively Frame;
The frame structure of multiple connection specifically describes and is as shown in Figure 1:
1. frame head: 1 byte is frame alignment signal;
2. indication field: 2 bytes, be used for control information transmission, as shown in Figure 2, comprise following content:
● type of service, 4bit is used to indicate type of service, as shown in Figure 3;
● error correction coding, 4bit is the error correction coding to business type field, error correction coding adopts extended hamming code to realize that (8,4) extended hamming code comprises 4 information bits, 3 check bits and 1 parity check bit, can realize correcting 1 bit-errors, detect simultaneously 2 bit-errors;
● the indication of speech off-hook, maximum 8bit, the dislodging machine state of indication two wires speech;
3. data field, 61 bytes
The data field definition of different service types is different:
● speech and synchrodata: valid data account for 60 bytes, and the 1st byte is for filling word;
● asynchronous data: valid data district 60 bytes, the 1st byte are the asynchronous data Length Indication, and value is 1～60;
● Ethernet service: valid data account for 61 bytes;
● infilled frame: 61 bytes all are to fill word.
(3) after Frame forms, send the transmission request signal to the multiple connection module, the opportunity of sending the transmission request signal of each business module is different:
● synchrodata and voice signal, data receiver reach 60 bytes, form a frame, just regularly send the transmission request signal;
● asynchronous data, data receiver reach 60 bytes or begin to arrive certain hour from receiving first byte, just send the transmission request signal.
(4) multiple connection module according to sending request signal, is taken out Frame from each professional reception the buffer area according to the multiple connection rule, sends from the form of line interface with synchronizing signal;
Described multiple connection rule is: when group road band be wider than each access service bandwidth and the time, remaining bandwidth sends infilled frame; When group road bandwidth less than the bandwidth of each access service and the time, regularly insert infilled frame, the principle that takies remaining bandwidth according to Ethernet service is carried out multiple connection; When the multiple connection module is received the transmission request signal of multiple business simultaneously, finish multiple connection according to priority order from high to low, namely according to speech and synchrodata, asynchronous data, the order of Ethernet data.
Divide termination process
(5) for the group signals that receives, at first take out receive data with receive clock and finish and receive adaptively, then the error correcting code of business type field detected data packet discarding that can not error correction;
(6) Demultiplexing module carries out the tap processing according to business type field, comprises abandoning infilled frame, the business datum in the business data frame is write respectively the transmission buffer area of each business;
(7) the business interface adaptation module is taken out business datum from sending buffer area, carry out interface adaptive after, business datum is sent respectively.
Claims (3)
1. the synchronous subdivision based on asynchronous system connects method, comprises multiple connection process and minute termination process, it is characterized in that comprising step:
The multiple connection process
(1) it is adaptive the business datum of each access to be carried out respectively interface;
(2) business datum after interface is adaptive is carried out buffer memory each professional reception in buffer area respectively, and according to the frame structure of multiple connection each business datum is formed respectively Frame;
(3) after Frame forms, send the transmission request signal to the multiple connection module;
(4) multiple connection module according to sending request signal, is taken out Frame from each professional reception the buffer area according to the multiple connection rule, sends from the form of line interface with synchronizing signal;
Divide termination process
(5) for the group signals that receives, at first take out receive data with receive clock and finish and receive adaptively, then the error correcting code of business type field detected data packet discarding that can not error correction;
(6) Demultiplexing module carries out the tap processing according to business type field, comprises abandoning infilled frame, the business datum in the business data frame is write respectively the transmission buffer area of each business;
(7) the business interface adaptation module is taken out business datum from sending buffer area, carry out interface adaptive after, business datum is sent respectively.
2. a kind of synchronous subdivision based on asynchronous system according to claim 1 connects method, and it is characterized in that: the frame structure of the multiple connection in the step (2) is:
1. frame head: 1 byte is frame alignment signal;
2. indication field: 2 bytes, be used for control information transmission, comprise following content:
● type of service, 4bit;
● error correction coding, 4bit is the error correction coding to business type field, realizes 1bit error code correction among the 8bit, the error detection of 2bit error code;
● the indication of speech off-hook, maximum 8bit, the dislodging machine state of indication two wires speech;
3. data field, 61 bytes
The data field definition of different service types is different:
● speech and synchrodata: valid data account for 60 bytes, and the 1st byte is for filling word;
● asynchronous data: valid data district 60 bytes, the 1st byte are the asynchronous data Length Indication, and value is 1～60;
● Ethernet service: valid data account for 61 bytes;
● infilled frame: 61 bytes all are to fill word.
3. a kind of synchronous subdivision based on asynchronous system according to claim 1 connects method, it is characterized in that: described multiple connection rule is in the middle of the step (4): when group road band be wider than each access service bandwidth and the time, remaining bandwidth sends infilled frame; When group road bandwidth less than the bandwidth of each access service and the time, regularly insert infilled frame, the principle that takies remaining bandwidth according to Ethernet service is carried out multiple connection; When the multiple connection module is received the transmission request signal of multiple business simultaneously, finish multiple connection according to priority order from high to low, namely according to speech and synchrodata, asynchronous data, the order of Ethernet data.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109379169A (en) * | 2018-12-07 | 2019-02-22 | 中国电子科技集团公司第五十四研究所 | A kind of code quick adjusting device of the anti-big error code of burst |
| CN113489565A (en) * | 2021-08-09 | 2021-10-08 | 四川灵通电讯有限公司 | Multi-channel service shared channel transmission system based on synchronous time division multiplexing system |
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| CN113489565B (en) * | 2021-08-09 | 2023-11-24 | 四川灵通电讯有限公司 | Multi-channel service shared channel transmission system based on synchronous time division multiplexing system |
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