CN1181627C - Digital multiplexing method and apparatus for fibre-optic transmission - Google Patents
Digital multiplexing method and apparatus for fibre-optic transmission Download PDFInfo
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- CN1181627C CN1181627C CNB011399473A CN01139947A CN1181627C CN 1181627 C CN1181627 C CN 1181627C CN B011399473 A CNB011399473 A CN B011399473A CN 01139947 A CN01139947 A CN 01139947A CN 1181627 C CN1181627 C CN 1181627C
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Abstract
The present invention relates to an optical fiber transmission digital multiplex device which comprises a plurality of justification units, a timing unit and a parallel-to-serial conversion unit, wherein the timing unit provides timing signals for other circuits; the parallel-to-serial conversion unit combines synchronous data which are transferred by the justification units and a spending plug-in unit. The present invention also provides a transmission multiplexing method which comprises: each justification unit respectively receives and stores external input signals; the timing unit controls to read out the stored signals from each storage region; the timing clocks of writing storage regions and reading storage regions are compared, and whether chance bits of a next frame are filled is determined according to whether plug request signals are generated; the parallel-to-serial conversion unit ranges the received synchronous data in a specified sequence under the control of the timing unit, and then, the synchronous data is multiplexed into high speed serial data with 16.896 Mb/s. The framing of the present invention is processed once, the circuit structure is simplified, the cost is reduced, and the bandwidth utilization rate is enhanced.
Description
Technical field
The present invention relates to the optical fiber transmission technique field, specifically, the present invention proposes a kind of method and apparatus of digital multiplexing, the fibre optic transmission equipment of low capacity in being particularly useful for.
Background technology
In general, fibre optic transmission equipment all will to the digital signal that is transmitted carry out twice above multiplexing.As shown in Figure 1, asynchronous digital Multiplexing Unit 1 is finished the asynchronous multiplexing of 4 2Mb/s code streams, and this multiplex process is deferred to ITU-T suggestion G.742.Its speed of code stream after multiplexing is 8.448Mb/s.Synchronous digital Multiplexing Unit 2 carries out synchronous multiplexing one time to the code stream of 8.448Mb/s again, inserts unit 4 from overhead functions in this multiplex process and inserts a certain amount of expense, radix-minus-one complement etc., makes it satisfy the requirement of Optical Fiber Transmission.The code stream of synchronous digital Multiplexing Unit 2 output 16.896Mb/s is given photoelectric conversion unit 3, realizes the multiplexing of optical transmission digital signal.
G.742 advise that according to ITU-T asynchronous digital Multiplexing Unit 1 has been realized the multiplexing of 4 2Mb/s signal to 8.448Mb/s signals by the frame structure of Fig. 2.Wherein every frame is divided into four sections, and every section 53 * 4 bits adopt by the multiplexing method of bit b
1, b
2, b
3, b
4It is respectively the information bit of 4 2Mb/s branch roads.The 4th section V
1-V
4Sign indicating number is the chance bit, and promptly this position may be an information code, also may be to fill in sign indicating number, relatively deciding according to speed.And C
1n-C
3n(n=1～4) are used to refer to the chance bit V sign indicating number of this frame in this 2Mb/s branch road and fill in sign indicating number or information code on earth, according to C
MnThe indication of (m represents the place section inferior, the branch road of 2Mb/s under the n representative) sign indicating number, receiving terminal can carry out suitable processing to each chance bit V sign indicating number, keeps information code, and sign indicating number is filled in removal.
The signal of 2 couples of 8.448Mb/s of synchronous digital Multiplexing Unit carries out first-order multiplexes again.As shown in Figure 3, adopt, transmit line by line from left to right by the bit multiplex mode.First classifies the H sign indicating number as, the F in the H sign indicating number
1-F
12Be the frame alignment sign indicating number, its length can change in certain scope.Every frame has M capable, and the numerical value of M also can be selected as the case may be, such as selecting 32 row.B
1, B
2, B
3, B
4It is the bit order in the 8.448Mb/s code stream of asynchronous digital Multiplexing Unit 1 output.
Be respectively B
1, B
3, B
4Radix-minus-one complement.Remaining space can be inserted official telephone, line supervision than top grade in the H sign indicating number, so that other complementary function to be provided.
Fig. 4 is the block diagram of the digital multiplexing mode that adopted of conventional low capacity optical transmission device.Only drawn the structure of multiplexing part among the figure, on function, the demultiplexing process is the inverse process of multiplex process, therefore not shown demultiplexing part.As can be seen from Figure 4, whole multiplex process is divided into two parts, first, and the signal from justification unit 51-54 input 2Mb/s signal to framer 6 generation 8.448Mb/s, this moment, signal became frame format G.742.Under the control of parallel serial conversion unit 9, the code word with inserting a times comprises optical link frame sign indicating number, radix-minus-one complement and other required overhead-bits afterwards, thereby constitutes the frame format of the high level of 16.896Mb/s code stream, then by 10 outputs of scrambler unit.
So there are two stages in this kind multiplex process, two kinds of frame formats, and multiplex process is that the elementary cell binding is carried out with 4 2Mb/s circuit, lack flexibility, and bandwidth utilization is lower.
Summary of the invention
The objective of the invention is defective, a kind of optical fiber and digital multiplexing method and equipment thereof are provided, the signal of 2-8 2Mb/s is obtained the signal of 16.896Mb/s by first-order multiplexes for the fibre optic transmission equipment that solves above-mentioned prior art.
Fibre optic transmission equipment of the present invention comprises a plurality of justifications unit 131-13n, is used for receiving the 2Mb/s signal of input and being stored in buffer area from a plurality of branch roads, and the while compares with the timing signal that timing unit is sent here, and whether decision fills in bell idles; A timing unit 12 provides timing controling signal to described a plurality of justifications unit and described expense insertion unit 150; An expense is inserted unit 150, under the control of timing controling signal, sends the data that are inserted into to the parallel serial conversion unit in the suitable moment; A parallel serial conversion unit 14 is used to converge each justification unit 131～13n and expense is inserted the data in synchronization bit that unit 150 is sent here, and it is multiplexed with the high-speed serial data of 16.896Mb/s and exports to scrambler unit 11.
Described expense is inserted unit 150 and comprised: a frame sign indicating number inserts unit 151, is used to insert frame sign indicating number bit; Fill in indication bit for one and insert unit 152, be used to insert indication bit; A chance bit inserts unit 153, is used for insertion machine meeting bit; An official telephone inserts unit 154, is used to insert the official telephone bit; Insert unit 155 with other expense, be used for other overhead-bits.The quantity of described a plurality of justifications unit is 2,3 ..., or 8.
The invention provides a kind of Optical Fiber Transmission multiplexing method, comprise step: receive the 2Mb/s signal of input and be stored in the buffer area from a plurality of branch roads, the timing signal of sending here with timing unit compares simultaneously, and whether decision fills in bell idles; Provide timing controling signal to described a plurality of justifications unit and described expense insertion unit (150); Under the control of timing controling signal, send the data that are inserted into to the parallel serial conversion unit in the suitable moment; Converge each justification unit (131～13n) and expense insert the data in synchronization bit that unit (150) is sent here, it is multiplexed with the high-speed serial data of 16.896Mb/s and exports to scrambler unit (11).
Utilize fibre optic transmission equipment of the present invention and method to realize purpose of the present invention.The multiplexing method of conventional fibre optic transmission equipment is under the speed of 16.896Mb/s, multiplexing way is 4 road fixing 2Mb/s signals, and the present invention can select multiplexing 1-8 road 2Mb/s signal flexibly under the speed of 16.896Mb/s, at most can multiplexing 8 road 2Mb/s signals.The framing number of times of conventional fibre optic transmission equipment is 2 times, and framing number of times of the present invention only needs 1 time, and circuit structure has been simplified, thereby has reduced cost, and bandwidth availability ratio has improved.
Other advantage of the present invention, characteristic will be from below in conjunction with will be clearer the description of accompanying drawing.
Description of drawings
Fig. 1 is the block diagram of fibre optic transmission equipment of the middle low capacity of prior art;
Fig. 2 is the asynchronous digital multiplexed frame structural representation that G.742 ITU-T advises;
Fig. 3 is the schematic diagram of common frame format of the optical link multiplexing and encoding of low capacity;
Fig. 4 is the block diagram of the optical transmission device of low capacity;
Fig. 5 is the block diagram of fibre optic transmission equipment of the present invention;
Fig. 6 is an expression multiplexing frame structure used in the present invention.
Embodiment
Fig. 5 shows the block diagram of fibre optic transmission equipment of the present invention.Fig. 5 has only shown the functional block diagram of multiplexing direction.Demultiplexing is multiplexing inverse process, and is therefore not shown.This fibre optic transmission equipment comprises a plurality of justifications unit 131～13n (n=2～8), a timing unit 12, it is that benchmark provides timing signal to other circuit with the clock signal of 16.896MHz, one is inserted unit 150 and a parallel serial conversion unit 14, this parallel serial conversion unit 14 converges each justification unit 131～13n and expense is inserted the data in synchronization that unit 150 is sent here, and the code stream that is multiplexed into 16.896Mb/s is delivered to scrambler unit 11.Insert and comprise in the unit 150 that the frame sign indicating number inserts unit 151, fills in indication bit C sign indicating number insertion unit (or be called for short the C sign indicating number and insert unit) 152, the chance bit inserts unit (or be called for short the V sign indicating number and insert the unit) 153, official telephone inserts unit 154, and other expense is inserted unit 155.
Referring to Fig. 5, timing unit 12 is a benchmark with the clock of 16.896MHz, according to timing requirement each electronic circuit transmission timing signal in system of Fig. 6 frame structure, coordinates each electronic circuit synchronous working.
Each justification unit 131～13n (n=1-8) is with a specific cycle, and the timing signal that this branch road 2Mb/s signal waiting for transmission and timing unit 12 are sent here compares, and whether decision fills in bell idles.The output of each justification unit 131～13n is sent to parallel serial conversion unit 14 with the output of inserting unit 150 and handles.Timing unit 12 also provides timing controling signal to inserting unit 150 simultaneously, and control is inserted unit 150 and sent the data that are inserted into to the parallel serial conversion unit in the suitable moment.Parallel serial conversion unit 14 converges each justification unit 131～13n and inserts the data in synchronization that unit 150 is sent here, and it is multiplexed with the high-speed serial data of 16.896Mb/s, outputs to scrambler unit 11 then.
Sign indicating number velocity modulation unit 131～13n belongs to tributary unit, receives from the 2Mb/s input signal of outside respectively and is stored into separately one the suitably buffer area of size, reads from buffer area with the momentary rate a little more than 2Mb/s according to the control of timing unit 12 then.Fig. 6 is an expression multiplexing frame structure used in the present invention.According to the frame structure of Fig. 6, when frame sign indicating number F has appearred in timing process
1～F
12, official telephone bit J
1～J
7And overhead-bits S
1～S
5Just stop reading in the buffer area during position.This time-code velocity modulation unit 131～13n stops toward having sent data outside, but under the control of timing unit 12, inserts unit 150 and send the data that are inserted into just at this moment.Fill in indication bit C
MnBe the indication bit of filling on each road, the m section of representative is inferior, and n represents the branch road number of 2Mb/s, n=1～8.Timing process runs into fills in indication bit C
MnDuring the position, each yard velocity modulation unit 131～13n stops to sending the effective information bit outside, the position is left for filled in indication bit C
MnFill in indication bit C
MnBe used to indicate pairing chance bit V
nThe position information of loading be effective information code or the invalid bit of filling in.Its concrete numerical value is filled in indication bit C by 131～13n inside, each yard velocity modulation unit
MnDecision circuit decides.The basic skills of this decision circuit is that the timing signal timing unit 12 sent here with a specific cycle and the 2Mb/s signal of input compare.Result has relatively determined whether to fill in request, takes place if any the request of filling in, and then the chance bit V corresponding to this 2Mb/s passage next frame just can not insert effective information code, fills in indication bit C for three of next frame simultaneously
MnSign indicating number all should be filled " 1 ", as the indication of filling in state.Determine not have the request filled in as relatively result, then the chance bit V of this 2Mb/s passage next frame is filled into information code, promptly descends three of frame to fill in indication bit C
MnSign indicating number is all filled " 0 ".
Under the control of timing unit 12, insert the data that unit 150 also will insert in suitable moment output.
Parallel serial conversion unit 14 carries out the serial merging with each justification unit 131～13n with the data that insertion unit 150 is sent, and has promptly formed the frame format of Fig. 6, then by 16 outputs of follow-up scrambler unit.Scrambler unit 11 is known technologies of general optical fiber transmission technique.
From each buffer area, read the signal of being stored according to this by timing unit 12 controls, if arrive the frame sign indicating number, fill in the position of indication bit Cmn sign indicating number, official telephone bit J sign indicating number and other overhead-bits S sign indicating number, then stop to read the interior data of buffer area, and insert corresponding frame sign indicating number, fill in indication bit Cmn sign indicating number, official telephone bit J sign indicating number and other overhead-bits S sign indicating number, simultaneously by clock that relatively writes buffer area and the clock of reading buffer area, request signal is filled in generation, to determine whether to fill the chance bit V of next frame.If any filling in request signal, then next frame fill in the set of indication bit C sign indicating number, chance bit V sign indicating number is filled, as not filling in request signal, then next frame fill in the reset of indication bit C sign indicating number, chance bit V sign indicating number is used to place information bit simultaneously.Deliver to the data sync of justification unit 131～13n and insertion unit 150 parallel serial conversion unit 14, under the control of timing unit 12, parallel serial conversion unit 14 is arranged the data in synchronization of being received with a kind of specific order, this frame structure is made of 8 row B1～B8,212 row, being divided into is 4 sections, 1 section of per 53 behavior.The step that synchrodata is arranged is as follows: read frame sign indicating number F1～F4 that the frame sign indicating number inserts unit 151 according to this, official telephone bit J1～J4, form first row, read frame sign indicating number F5～F8, official telephone bit J5～J7, other overhead-bits S1, form second row, read frame sign indicating number F9～F12, other overhead-bits S2～S5 forms the third line.Is information bit from the 4th row to the 53rd provisional capital, takes from justification unit 131～13n successively.The 54th row is the position of filling in indication bit C sign indicating number, and for filling in indication bit C11～C18, the 55th row is taken from justification unit 131～13n successively to 106 behavioural information bits according to this.Indication bit C21～C28 is filled in the 107th behavior, and the 108th row is taken from justification unit 131～13n successively to 159 behavioural information bits.Indication bit C31～C38 is filled in the 160th behavior, the 161st behavior chance bit V1～V8, and the 162nd row is taken from justification unit 131～13n successively to 212 behavioural information bits.The 213rd goes, and begins a new frame.So move in circles, constantly continuity.
Though an embodiment with reference to accompanying drawing has described the present invention in the above, obviously the present invention is not subjected to the qualification of specific embodiment, and those skilled in the art can change or replace without departing from the scope of the invention.For example, when transmitting the step of inserting bit, frame alignment sign indicating number F
1～F
12Transmit other position that also can be arranged in every frame first three rows, in like manner, and overhead-bits S
1～S
5With official telephone bit J
1～J
7The position can arrange flexibly; Overhead-bits S
1～S
5Can be used to transmit alarm monitoring information; Frame sign indicating number F
1～F
12, official telephone bit J
1～J
7And other overhead-bits S
1～S
5Quantity all can change, but all be arranged in first three rows in principle.Row B also can be used to transmit overhead-bits, such as getting row B
7, B
8Two row do not transmit the information of 2Mb/s, and get row B
7Transmit overhead-bits, get row B
8Transmit the radix-minus-one complement bit.
Claims (7)
1. Optical Fiber Transmission digital multiplex equipment is characterized in that comprising:
A plurality of justifications unit (131-13n) is used for receiving the 2Mb/s signal of input and being stored in buffer area from a plurality of branch roads, and the while compares with the timing signal that timing unit is sent here, and whether decision fills in bell idles;
A timing unit (12) is carried timing signal to described a plurality of justifications unit and expense insertion unit (150);
An expense is inserted unit (150), under the control of timing signal, sends the data that are inserted into to the parallel serial conversion unit;
A parallel serial conversion unit (14), be used for if any filling in the bell idles request, insert described expense insert unit (150) be inserted into data and carry out serial with the data of described justification unit (131-13n) output and merge, it is multiplexed with the high-speed serial data of 16.896Mb/s and exports to scrambler unit (11).
2. according to the Optical Fiber Transmission digital multiplex equipment of claim 1, it is characterized in that described expense insertion unit (150) comprising:
A frame sign indicating number inserts unit (151), is used to insert frame sign indicating number bit;
Fill in indication bit for one and insert unit (152), be used to insert indication bit;
A chance bit inserts unit (153), is used for insertion machine meeting bit;
An official telephone inserts unit (154), is used to insert the official telephone bit; With
Other expense is inserted unit (155), is used for other overhead-bits.
3. according to the Optical Fiber Transmission digital multiplex equipment of claim 1 or 2, it is characterized in that the quantity of described a plurality of justifications unit is 8.
4. Optical Fiber Transmission digital multiplexing method comprises step:
A) timing unit provides timing signal to a plurality of justifications unit (131-13n) and expense insertion unit (150);
B) receive the 2Mb/s signal of input and be stored in the buffer area from a plurality of branch roads, the timing signal of sending here with timing unit compares simultaneously, and whether decision fills in bell idles;
C) under the control of timing signal, described expense is inserted unit (150) and is sent the data that are inserted into to the parallel serial conversion unit;
D) if any filling in the bell idles request, insert described expense and insert the data that are inserted into of unit (150) and carry out the serial merging, it is multiplexed with the high-speed serial data of 16.896Mb/s and exports to scrambler unit (11) with the data of described justification unit (131-13n) output.
5. according to the Optical Fiber Transmission digital multiplexing method of claim 4, wherein said d) step comprises the step of inserting the frame sign indicating number, filling in indication bit, official telephone bit and other overhead-bits.
6. according to the Optical Fiber Transmission digital multiplexing method of claim 5, when defining when filling in request, fill in indication bit set and the filling machine of next frame can bits, otherwise next frame fill in the indication bit reset, the chance bit is placed information bit.
7. according to the Optical Fiber Transmission digital multiplexing method of claim 5, wherein said multiplexing step is to arrange with four sections, every section 53 row, and wherein the arrangement of each row is as follows: the 1st row is placed frame sign indicating number and official telephone bit; The 2nd row is placed frame sign indicating number, official telephone bit and other overhead-bits; The 3rd row is placed frame sign indicating number, other overhead-bits; 4-53,55-106, the capable placement of 108-159,162-212 information bit; 54th, 107,160 row are placed and are filled in bell idles; The 161st row placement machine can bit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011399473A CN1181627C (en) | 2001-11-21 | 2001-11-21 | Digital multiplexing method and apparatus for fibre-optic transmission |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011399473A CN1181627C (en) | 2001-11-21 | 2001-11-21 | Digital multiplexing method and apparatus for fibre-optic transmission |
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| Publication Number | Publication Date |
|---|---|
| CN1420642A CN1420642A (en) | 2003-05-28 |
| CN1181627C true CN1181627C (en) | 2004-12-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB011399473A Expired - Fee Related CN1181627C (en) | 2001-11-21 | 2001-11-21 | Digital multiplexing method and apparatus for fibre-optic transmission |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101720553B (en) * | 2007-07-19 | 2012-09-05 | 日立民用电子株式会社 | Receiving device and receiving method |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1841976B (en) * | 2005-03-29 | 2010-04-28 | 华为技术有限公司 | Method and system for transmitting real-time parallel data stream |
| JP4729049B2 (en) * | 2005-12-22 | 2011-07-20 | 日本電信電話株式会社 | Optical transmitter |
| CN102223282A (en) * | 2011-07-07 | 2011-10-19 | 武汉微创光电股份有限公司 | Method for establishing virtual multi-Ethernet channel through optical fibre |
| JP6120958B2 (en) * | 2012-07-05 | 2017-04-26 | ゼットティーイー コーポレーションＺｔｅ Ｃｏｒｐｏｒａｔｉｏｎ | Business overhead processing method, apparatus and system |
| CN109889271B (en) * | 2019-01-16 | 2020-08-11 | 武汉恒泰通技术有限公司 | Variable frequency scrambling optical module and implementation method |
-
2001
- 2001-11-21 CN CNB011399473A patent/CN1181627C/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101720553B (en) * | 2007-07-19 | 2012-09-05 | 日立民用电子株式会社 | Receiving device and receiving method |
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| CN1420642A (en) | 2003-05-28 |
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