WO2000060783A1 - Method for transmitting data streams presenting different data transmission rates between a first and a second data transmission unit - Google Patents
Method for transmitting data streams presenting different data transmission rates between a first and a second data transmission unit Download PDFInfo
- Publication number
- WO2000060783A1 WO2000060783A1 PCT/DE2000/000698 DE0000698W WO0060783A1 WO 2000060783 A1 WO2000060783 A1 WO 2000060783A1 DE 0000698 W DE0000698 W DE 0000698W WO 0060783 A1 WO0060783 A1 WO 0060783A1
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- WIPO (PCT)
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/06—Synchronising arrangements
- H04J3/07—Synchronising arrangements using pulse stuffing for systems with different or fluctuating information rates or bit rates
- H04J3/076—Bit and byte stuffing, e.g. SDH/PDH desynchronisers, bit-leaking
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/16—Time-division multiplex systems in which the time allocation to individual channels within a transmission cycle is variable, e.g. to accommodate varying complexity of signals, to vary number of channels transmitted
- H04J3/1605—Fixed allocated frame structures
- H04J3/1611—Synchronous digital hierarchy [SDH] or SONET
Definitions
- multiplexers are used to bundle channels on the receiving side in wavelength multiplexers.
- the bandwidth of the optical channels is better utilized and on the other hand the number of selective lasers required for wavelength multiplexing is reduced.
- the object of the invention is to achieve maximum or effective utilization of the transmission capacity provided by the communication network when a plurality of data streams having different data transmission rates are transmitted via a communication network, in particular via an optical communication network.
- the problems are solved by a method based on a method according to patent claim 1 by its characteristic features.
- the essential aspect of the method according to the invention for transmitting data streams having different data transmission rates between a first and a second data transmission unit is that the data to be transmitted telenden data streams m the same amount of data and the same data transfer rate having data frames are inserted.
- the main advantage of the method according to the invention is that a transparent transmission of data streams having any data transmission rates or a transparent transmission of information transmitted according to any data transmission method and having any data formats is realizable. Furthermore, an optimal, i.e. maximum utilization of the transmission capacity provided by a communication network or optimal utilization of the bandwidth of a data transmission channel made available for the transmission of information is achieved.
- complex Pomter processes multiplexers can be dispensed with. Furthermore, the number of selective lasers at the input can be reduced by wavelength multiplexers providing a data transmission channel.
- the data transmission rate of the data frames is adapted to the data transmission rates of the data streams with the aid of stuffing information arranged in the data frame.
- FIG. 3 shows a data frame for multiplexing a 2.488.320 GBit / s data stream
- FIG 5 shows a multiplex structure for forming the multiplex signal.
- 6 shows a data frame for an multiplex signal
- FIG. 1 shows a section of a data transmission system in which wavelength multiplexers are arranged for, for example, N x 10 Gbit / s channels.
- a first data transmission unit which represents a terminal multiplexer MUXE, is arranged, by means of which data signals or data streams el, e2, e31, e32 present at inputs EMI 4 are combined, which have different data transmission rates.
- a data transmission rate of 2.666057 Gbit / s data signal el or em a data transmission rate of 2.666057 Gbit / s data stream el is introduced.
- This data signal or data stream is defined in ITU-T m of recommendation G.975 and describes an STM-16 / OC-48 signal with FEC (Forward Error Correction).
- the second input EM2 of the multiplexer MUXE is supplied with a 2.488.320 Gbit / s data signal e2 or a data transmission rate of 2.488.320 Gbit / s data stream e2.
- This data signal e2 is defined in ITU-T m of recommendation G.707 and describes an STM-16 / OC-48 signal. Furthermore, at each of the third and fourth inputs of the multiplexer MUXE there is a 1.250 GBit / s data signal or a data transmission rate e31, e32 with a data transmission rate of 1.250 GBit / s introduced.
- This data signal e31, e32 is defined in IEEE P 802.3 and describes em data signal referred to as “Gigabit Ethernet.
- the output signal present at the output AM of the terminal multiplexer MUXE is forwarded to a wavelength division multiplexer WDM.
- the data routed via a wavelength multiplexer WDM are transmitted, for example, via optical or electrical amplifiers OA, ER and further wavelength multiplexers WDM to a data transmission unit which is arranged at the end of the data transmission system and also represents a term multiplexer MUXA.
- the data signals or data streams el, e2, e31, e32 present at the four inputs EMI 4 are inserted in each case data frames - also referred to as containers - DR1 3, the data frames DR1 3 each have the same data volume and the same data transfer rate.
- the data frames DR1 3 formed or the data signals el, e2, e31, e32 inserted into the data frames DRl 3 are then multiplexed by the multiplexer MUXE and m em the multiplex signal a representing the output signal is converted.
- FIG. 2 shows a first data frame DR1 for multiplexing the 2.666 057 Gbit / s data signal el - STM-16 / OC-48 with FEC -.
- the 2,666 GBit / s data signals el defined in accordance with recommendation G.975 can be plesiochronous to each other and may have a maximum deviation from the target frequency of 4.6 ppm - part-per-million.
- the first data frame DR1 has 6 subframes UR1 6. In the first subframe UR1, 225 data bits of the 2,666 Gbit / s data signal el are transmitted as user data nd.
- first and second stuffing control bits C1, C2 are arranged.
- the two stuffing troll bits C1, C2 are additionally arranged in first and second stuff bits S1, S2.
- 225 data bits are each added to the two stuffing control bits C1, C2, and in the sixth subframe UR6 to the two stuffing control bits C1, C2 and the two stuffing bits S1, S2, 223 data bits of 2.66 GBit / s Data signal el transmitted as useful data nd.
- the first data frame DR1 has a total data volume of 1360 bits, of which, depending on the state or use of the two stuff bits S1, S2, 1348 to 1350 bits can be used as user data nd for transmitting data bits of the 2,666 GBit / s data signal el.
- a stuffing method is used. For example, a positive tamping process can be used.
- the stuffing information m is transmitted to the first and second stuffing control bits C1, C2, the first and second stuffing control bits C1, C2 each specifying whether the two stuffing bits S1, S2 are occupied with useful information or not. For example, when the first stuffing control bits C1 are assigned the bit combination “00000”, it is indicated that the first stuffing bit S1 is used to transmit data bits of the data signal el.
- the first stuffing control bits Cl are assigned the
- Bit combination "Hill” indicates that the first stuffing bit Sl is a stuffing bit. A majority decision is advantageously carried out to protect against individual bit errors in the stuffing control bits C1, C2 arranged in the first data frame DR1.
- data bits of the first data signal el are transmitted as useful data nd by the first data frame DR1 1348 to 1350. If a positive stuffing method is used, the data transmission rate of the first data frame DR1 is selected such that in the normal case pro Data frame 1349 user data bits nd are transmitted. This leads to a nominal bit rate of the first data frame DR1
- the stuffing method used thus allows the data transmission rate of the data signal inserted into the first data frame DR1 to fluctuate with the following limits f, f:
- FIG. 3 shows a second data frame DR2 for multiplexing the 2.488 320 Gbit / s data signal e2.
- the same stuffing procedure as for the first data frame DR1 is used for the second data frame DR2, which also has six subframes URL.6.
- the second data frame DR2 in the useful data field nd of the first to fifth subframe UR1 ... 5, fourteen data bits 14D of the second data signal e2 are alternately fifteen times followed by a fixed stuff bit R transfer.
- the second data frame DR2 In the sixth subframe UR6 of the second data frame DR2, 12 data bits 12D of the second data signal e2 are transmitted as user data followed by a fixed stuff bit R and then fourteen times alternately fourteen data bits 14D of the second data signal e2 are transmitted as user data followed by a fixed stuff bit R
- the second data frame DR2 also has a data volume of 1360 bits, the second data frame DR2 transmitting 1258 to 1260 data bits depending on the use or state of the two stuff bits S1, S2.
- the second data frame DR2 In order to enable subsequent multiplexing of the first and second data frames DR1, DR2 formed, the second data frame DR2 has the same data transmission rate as the first data frame DR1.
- the stuffing method used in the second data frame DR2 thus allows the data transmission rate of the data signal e2 inserted in the second data frame DR2 to fluctuate with the following limits f ,, f:
- the third data frame DR3 shows the third data frame DR3 for the simultaneous multiplexing of two 1.250 GBit / s data signals e31, e32, which are also referred to as Gigabit Ethernet data signals in accordance with IEEE P802.3.
- the third data frame DR3 also has six subframes UR1 6, with e first and second stuffing control bits C1, C2 being arranged at the beginning of the second to sixth subframes UR2 6.
- first and second stuffing control bits C1, C2 being additionally in the sixth subframe UR6
- Stopfbit Sl, S2 arranged.
- the data bits of the two 1.250 Gbit / s data signals e31, e32 to be transmitted are interleaved alternately or bit by bit - bit mterleaved - m the subframes UR1 6 are inserted, i.e. the six subframes UR1 6 alternately em bit of the first
- the first darning control bits C1 and the first stuff bit S1 are assigned to the first gigabit Ethernet signal e31 and the second stuff control bits C2 and the second stuff bit S2 to the second gigabit Ethernet signal e32.
- fourteen data bit groups (14D) with a data volume of fourteen bits each are inserted in the third data frame DR3 in the useful data field nd of the first to fifth subframe UR1 5, whereby each of the data bit groups (14D) is followed by a fixed stuff bit (R).
- Subframes each inserted a data bit group (15D) having a data volume of 15 bits.
- the sixth subframe UR6 are a data bit group (12D) with a data volume of twelve bits, followed by a fixed stuff bit (R), and thirteen data bit groups (14D), each with a data volume of fourteen bits, each followed by a fixed stuff bit (R), and one a data bit group (15D) having a data volume of fifteen bits is inserted.
- the data bits of the two gigabit Ethernet signals e31, e32 are interleaved bit by bit as user data.
- the third data frame DR3 shown in FIG. 4 has a data volume of 1360 bits, of which 632 or 633 data bits are transmitted as user data for each of the two gigabit Ethernet signals e31, e32, depending on the use or state of the stuff bits S1, S2 .
- the third data frame DR3 has the same data transmission rate as that of the two data frames DR1, DR2 already described.
- FIG 5 shows a multiplex structure for forming a multiplex signal as is self-explanatory.
- four frame signals in any combination each representing one of the data frames DR1 3, are multiplexed to form a multiplex signal as.
- the corresponding data frame DR1 3 is inserted, the data transfer rates of the inserted data signals el, e2, e31, e32 being adapted to the uniform data transfer rate of the data frame DR1 3 by inserting fixed stuffing bits and by means of the described stuffing method.
- the data frames DRl 3 formed are interleaved bit by bit - bit mterleaved - by multiplexing means AUG.
- STM - for example a "synchronous transport module" STM - the interleaved data signal or data stream em frame code word RKW and corresponding overhead information OH are added and the multiplex signal as is formed therefrom.
- the multiplex signal as formed is then transmitted via the communication network to the target multiplexer MUXA shown in FIG. 1, with which the received multiplex signal as again demultiplexes the data frames DR1 3 and m the data signals el, e2, e31, e32 inserted therein becomes.
- FIG. 6 shows an exemplary embodiment of the multiplex signal as formed.
- the frame recognition word RKW which has a data volume of 16 bits.
- the overhead information OH which has a data volume of 8 bits, is arranged after the frame recognition word RKW.
- the multiplex signal as shown is also divided into six subframes UR1 6, the six subframes having a total data volume of 5464 bits. In the six subframes UR1 6, the data bits of any combination of four data frames DR1 3 formed are interleaved bit by bit or inserted bit-ltered.
- the respective subframes UR1 6 of the four data frames Cl 4 are correspondingly combined or multiplexed by the bitwise interleaving of any combination of four data frames DR1 3 formed; for example, the first subframe UR1 of the four data frames DR1 3 combined in the multiplex signal as are interleaved bit by bit in the first subframe UR1 of the multiplex signal as.
- the data transfer rate of the multiplex signal as is:
- any data frame DR1 3 with any data scope and data transfer rates can be formed, the data frame DRl 3 being ultlexed into any multiplex signals as.
- optimal input signals can be created for the wavelength division multiplexers which are adapted to the transmission channels of the wavelength division multiplexers.
- Example eight of the described input signals el, e2, e31, e32 are supplied to the multiplexer MUXE in accordance with an embodiment variant (not shown), the input signals el, e2, e31, e32 being multiplexed to form a 20 Gbit / s multiplex signal as.
Abstract
Description
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Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP00920374A EP1166479A1 (en) | 1999-03-31 | 2000-03-06 | Method for transmitting data streams presenting different data transmission rates between a first and a second data transmission unit |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19914796.5 | 1999-03-31 | ||
DE19914796 | 1999-03-31 | ||
DE19925247A DE19925247A1 (en) | 1999-03-31 | 1999-06-01 | Method for transmitting data streams having different data transmission rates between a first and a second data transmission unit |
DE19925247.5 | 1999-06-01 |
Publications (1)
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WO2000060783A1 true WO2000060783A1 (en) | 2000-10-12 |
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PCT/DE2000/000698 WO2000060783A1 (en) | 1999-03-31 | 2000-03-06 | Method for transmitting data streams presenting different data transmission rates between a first and a second data transmission unit |
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WO (1) | WO2000060783A1 (en) |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4667324A (en) * | 1985-09-05 | 1987-05-19 | Northern Telecom Limited | Network multiplex structure |
-
2000
- 2000-03-06 WO PCT/DE2000/000698 patent/WO2000060783A1/en not_active Application Discontinuation
- 2000-03-06 EP EP00920374A patent/EP1166479A1/en not_active Withdrawn
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4667324A (en) * | 1985-09-05 | 1987-05-19 | Northern Telecom Limited | Network multiplex structure |
Non-Patent Citations (1)
Title |
---|
GROVER W D ET AL: "UNIVERSAL PLESIOCHRONOUS MULTIPLEXING (UPM) FOR ARBITRARY RATE ISOCHRONOUS CIRCUIT EMULATION", ELECTRONICS LETTERS,GB,IEE STEVENAGE, vol. 32, no. 19, 12 September 1996 (1996-09-12), pages 1765 - 1766, XP000638814, ISSN: 0013-5194 * |
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EP1166479A1 (en) | 2002-01-02 |
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