CN1933367A - TDM business realizing method based on Ethernet passive light network - Google Patents
TDM business realizing method based on Ethernet passive light network Download PDFInfo
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- CN1933367A CN1933367A CNA2006101226369A CN200610122636A CN1933367A CN 1933367 A CN1933367 A CN 1933367A CN A2006101226369 A CNA2006101226369 A CN A2006101226369A CN 200610122636 A CN200610122636 A CN 200610122636A CN 1933367 A CN1933367 A CN 1933367A
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Abstract
A method for realizing TDM service based on Ethernet passive optical network includes carrying out code rate regulation on TDM service data by both optical line terminal and optical network unit then multiplexing two paths of regulated data to be one path and using Ethernet frame format to package multiplexed data in sending process, forming original TDM service data by depackaging and demultiplexing as well as deregulating in receiving process, utilizing system clock of passive optical network to synchronize clock at said terminal and said unit in both said receiving and sending processes.
Description
Technical field
The invention belongs to access technology, be specifically related to the TDM business is fitted to method in the Ethernet based on Ethernet passive optical network EPON.
Technical background
Realize low-cost, access at a high speed at a distance based on gigabit ethernet passive optical network EPON system, be considered to the new trend of broadband access.The EPON system can realize efficiently based on the data service of Ethernet and the access of speech business, but for traditional TDM business, realize then acquiring a certain degree of difficulty in the EPON system.Industry generally adopts the method for circuit simulation to recover timing clock signal at present, and this method is packaged into the IP packet with TDM business datum and clock information, recovers business datum and clock signal during reception from the IP packet.The realization of this method is difficulty relatively, and cost is higher, and the clock recovered precision is also not fully up to expectations, also needs the supplier of IP operation that the TDM business data packet is carried out the QoS assurance during actual the use.
According to the EPON agreement IEEE802.3ah that IEEE802.3 formulates, the transmission of optical network unit at remote side ONU and reception all will be used the line clock that extracts from passive optical network PON, normally realize with the distance measurement function that guarantees Multi-point Control Protocol MPCP among the ONU.The clock of hence one can see that ONU is synchronous with optical line terminal OLT.
If the system clock that the TDM service signal can be adjusted to OLT, ONU is synchronous, then can in the EPON system, realize the TDM business in a simple manner.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art, provide a kind of and tdm data can be adjusted to the EPON system clock synchronously, and be fitted to method in the Ethernet Frame.
In order to realize the foregoing invention purpose, the technical scheme of employing is as follows:
A kind of TDM service implementation method based on Ethernet passive optical network comprises the passive optical network formed by interconnective optical line terminal of passive fiber splitter and optical network unit process of transmitting and the receiving course to the TDM business datum; In the described process of transmitting, described optical line terminal and optical network unit all carry out justification to the TDM business datum before sending the TDM business datum, again adjusted two paths of data is multiplexed into one the tunnel, the The data ethernet frame format after multiplexing carries out data envelope; Described receiving course is then separated data earlier and is sealed, and will unpack the data that the data of being honored as a queen carry out behind demultiplexing, the demultiplexing again and go to adjust again, and forms original TDM business datum; Pass through from the system clock synchronizable optical line terminal of EPON and the clock of optical network unit in the transmission of described TDM business datum and the receiving course.
In the technique scheme, the system clock of described EPON is 125MHz, and system clock then is the optical link clock that employing is extracted from EPON at the local clock that optical line terminal employing crystal oscillator produces at optical network unit.
The original sign indicating number of described TDM business datum speed is 2.048Mb/S, is 2.5Mb/S after the justification.
Two-way TDM business datum after the justification is undertaken multiplexing by byte multiplexer mode.
Because the TDM business datum be 2.5Mb/S after justification, and it is multiplexing to carry out two paths of data, so system clock produces 2.5MHz, 5MHz respectively to justification and multiplexing use by frequency divider.
When sign indicating number speed is adjusted to 2.5Mb/S for the TDM business datum of 2.048Mb/S, the Frame F length of adjusted TDM business datum is 224Bit, wherein filling in idle bit S is 36Bit, test bit T is 1Bit, decision bits C1 and C2 and C3 are 3Bit, adjusting bit V is 1Bit, and valid data bit D is 183Bit.
The form of Frame F is as shown in the table:
| Byte sequence | The bit explanation | |
| 1 | Fill in bit S[0:7] | |
| 2 | Data bit D[0:7] | |
| 3 | ||
| 4 | ||
| 5 | ||
| 6 | ||
| 7 | Fill in bit S[0:6] | Decision bits C1 |
| 8 | Data b it D[0:7] | |
| 9 | ||
| 10 | ||
| 11 | ||
| 12 | ||
| 13 | Fill in bit S[0:6] | Decision bits C2 |
| 14 | Data b it D[0:7] | |
| 15 | ||
| 16 | ||
| 17 | ||
| 18 | ||
| 19 | Fill in bit S[0:6] | Decision bits C3 |
| 20 | Data b it D[0:7] | |
| 21 | ||
| 22 | ||
| 23 | ||
| 24 | ||
| 25 | Fill in bit S[0:6] | Test bit T |
| 26 | Data b it D[0:7] | |
| 27 | ||
| 28 | Data b it D[0:6] | Adjust bit V |
Among the Frame F after the above-mentioned justification, adjust bit V and can be used for transmitting the valid data bit, and whether it transmits data bit controlled by the value of decision bits C1, C2, C3, when the value of decision bits C1 and C2 and C3 is 1, what adjust bit V transmission is the valid data bits, when the value of decision bits C1 and C2 and C3 was 0, what adjust bit V transmission was idle bit.
The permission speed range that can accommodate the effective information load so is:
Tdm data max=(183+1)/224 * 2500000=2.0535Mbit/s;
Tdm data min=(183+0)/224 * 2500000=2.0424Mbit/s.
Per two justification Frame F are encapsulated as an ethernet frame E during described data envelope.Two-way carries out multiplexing through TDM business data frame F after the justification, multiplexing mode by byte-interleaved is carried out, and the formed multi-frame MF stream rate in multiplexing back is 5Mb/S.The frame structure of multi-frame MF is as shown in the table:
| Byte sequence | The bit explanation | ||
| 1～2 | T1, T2 fill in bit S[0:7] | ||
| 3～12 | T1, T2 data bit D[0:7] | ||
| 13～14 | T1, T2 fill in bit S[0:6] | T1, T2 decision bits C1 | |
| 15～24 | T1, T2 data b it D[0:7] | ||
| 25～26 | T1, T2 fill in bit S[0:6] | T1, T2 decision bits C2 | |
| 27～36 | T1, T2 data b it D[0:7] | ||
| 37～38 | T1, T2 fill in bit S[0:6] | T1, T2 decision bits C3 | |
| 39～48 | T1, T2 data b it D[0:7] | ||
| 49～50 | T1, T2 fill in bit S[0:6] | T1, T2 test bit T | |
| 51～56 | T1, T2 data b it D[0:7] | ||
| T1, T2 data b it D[0:6] | T1, T2 adjust bit V | ||
Per two justification multiplexed frame MF are encapsulated as an Ethernet frame E during data envelope.Because the Ethernet frame must comprise 18Byte such as destination address, source address, frame length, verification, be 144Bit, and MF contains and fills in idle bit 72bit in each multi-frame, 2 total 144bit of multi-frame, be 18Byte, in order to improve efficiency of transmission, the frame structure of multi-frame MF is adjusted, reconfigure and form 94 byte Ethernet frame E.It is as shown in the table to adjust back Ethernet frame structure:
Wherein F0T1 represents first multi-frame of TDM branch road 1; F0T2 represents first multi-frame of TDM branch road 2; F1T1 represents second multi-frame of TDM branch road 1; F1T2 represents second multi-frame of TDM branch road 2.
Destination address DA in the Ethernet frame is the MAC Address of the professional opposite end of TDM by default; Source address is the local terminal MAC Address by default.
Described ethernet frame transmits by Layer 2 switch and EPON system.
Through justification, multiplexing, encapsulation process, two-way TDM business datum successfully is fitted in the Ethernet frame, and data in the Ethernet frame and EPON system clock are synchronous.
The present invention is by EPON agreement IEEE802.3ah, make in the professional transport process of TDM, the clock synchronization of OLT and ONU, satisfied the TDM business to strict demand regularly, realized that the TDM business fits on the EPON, used method provided by the invention that the TDM business can be provided in the EPON system very easily.
Description of drawings
Accompanying drawing 1 is a theory diagram of the present invention;
Accompanying drawing 2 is the justification logic diagram of circuit;
Accompanying drawing 3 is for going the justification logic diagram of circuit;
Accompanying drawing 4 is the data envelope frame structure.
Embodiment
The present invention is described further below in conjunction with accompanying drawing.
Principle of the invention block diagram as shown in Figure 1.Mainly in OLT and ONU, be provided with justification/go adjustment, multiplex/demultiplex and data envelope/separate and module such as seal.The course of work of these modules adopts the clock source of IEEE802.3ah agreement defined.
The present invention includes the process of transmitting and the receiving course of TDM business datum;
In the process of transmitting, described optical line terminal and optical network unit all carry out justification to the TDM business datum before sending the TDM business datum, more adjusted two paths of data are multiplexed into one the tunnel, and the The data ethernet frame format after multiplexing carries out data envelope;
Receiving course is then separated data earlier and is sealed, and will unpack the data that the data of being honored as a queen carry out behind demultiplexing, the demultiplexing again and go to adjust again, and forms original TDM business datum;
Justification modular circuit logic diagram is the fifo circuit of a first in first out as shown in Figure 2.The corresponding write address of the data of input FIFO; Corresponding one of the data of output FIFO are read the address.Writing the address increases in proper order according to the clock signal of TDM business, and reading the address increases according to the system clock order, prescribes a time limit greater than control gate when the difference that writes the address and read the address, and read address counter is extra to be increased once.Adjustment bit V in the corresponding frame structure of sense data puts 1 with the control bit C in the frame structure simultaneously.
Input data: form by serial data signal, data useful signal.Write Buffer as the tdm data signal.
Dateout: form by serial data signal, data useful signal.Read from Buffer as adjusting the back signal.
Write pointer: produce by write address counter, be used for the input data are write certain address of Buffer.
Read pointer: produce by read address counter, be used for certain address read-outing data from Buffer.
Reading the address counting enables: produced by the address comparison module, be used to control read address counter.Enable effective hour counter operate as normal, the technology device increases in proper order; Enable invalid hour counter and quit work, count value keeps initial value.
Line clock: the TDM line clock that from tdm data, extracts.
System clock: for OLT is local clock; For ONU is the line clock that PON recovers.
Removing justification modular circuit logic diagram as shown in Figure 3, also is the fifo circuit of a first in first out.Form by Buffer, digital phase-locked loop, C sign indicating number testing circuit, write address counter and read address counter.The corresponding write address of the data of input FIFO; Corresponding one of the data of output FIFO are read the address.Whether C sign indicating number testing circuit is complete 1 to discern the validity of adjusting bit (V) according to control bit C, and bit V or data bit D read the address enable signal when effective and the system clock enable signal is effective when adjusting.Read the address enable signal when effective read address counter increase in proper order.Digital phase-locked loop is recovered the clock of tdm data according to the system clock enable signal.Recover the back clock read address counter is counted, count value increases in proper order.
Input data: form by serial data signal, data useful signal.Write Buffer as the tdm data signal.
Dateout: form by serial data signal, data useful signal.Read from Buffer as read data signal.
Write pointer: produce by write address counter, be used for the input data are write certain address of Buffer.
Read pointer: produce by read address counter, be used for certain address read-outing data from Buffer.
The write address counting enables: produced by C sign indicating number testing circuit, be used to control read address counter.When control bit C is 1 or data bit D when effective entirely, enable signal is effective; The counter operate as normal, counter increases in proper order; Enable invalid hour counter and quit work, count value keeps initial value.
Line clock: from the TDM line clock of digital phase-locked loop recovery.
System clock: for OLT is local clock; For ONU is the line clock that PON recovers.
Multiplexing and demultiplexing module is the multiplexing and decomposable process of two-way tdm data, and the mode by byte-interleaved when multiplexing is carried out multiplexing.
Data envelope is sealed the tdm data after multiplexing by the Ethernet data packet format, increase destination address, source address, length/type byte and CRC check byte, sealing the back data packet format sees shown in the accompanying drawing 4, comprise destination address DA, take 6 bytes altogether, source address SA also takies 6 bytes, the expression data length is or/and the Length/Type of data type, take 2 bytes, and the tdm data Payload that takies 94 bytes, at last for taking the check (CRC) of 4 bytes.
Separate when sealing, the destination address that is received equals the Frame of this machine MAC Address, and extracts the Payload field from the Frame that receives, and valid data is sent to demultiplexing module carry out demultiplexing.
Claims (9)
1, a kind of TDM service implementation method based on Ethernet passive optical network comprises the passive optical network formed by interconnective optical line terminal of passive fiber splitter and optical network unit process of transmitting and the receiving course to the TDM business datum;
It is characterized in that in the described process of transmitting, described optical line terminal and optical network unit all carry out justification to the TDM business datum before sending the TDM business datum, again adjusted two paths of data is multiplexed into one the tunnel, the The data ethernet frame format after multiplexing carries out data envelope;
Described receiving course is then separated data earlier and is sealed, and will unpack the data that the data of being honored as a queen carry out behind demultiplexing, the demultiplexing again and go to adjust again, and forms original TDM business datum;
Pass through from the system clock synchronizable optical line terminal of EPON and the clock of optical network unit in the transmission of described TDM business datum and the receiving course.
2, the TDM service implementation method based on Ethernet passive optical network according to claim 1, the system clock that it is characterized in that described EPON is 125MHz, and the local clock that system clock adopts crystal oscillator to produce at optical line terminal then is to adopt the optical link clock that extracts from EPON at optical network unit.
3, the TDM service implementation method based on Ethernet passive optical network according to claim 1 and 2 is characterized in that the original sign indicating number speed of described TDM business datum for 2.048Mb/S, is 2.5Mb/S after the justification.
4, the TDM service implementation method based on Ethernet passive optical network according to claim 3 is characterized in that two-way TDM business datum undertaken multiplexing by byte multiplexer mode.
5, the TDM service implementation method based on Ethernet passive optical network according to claim 3 is characterized in that described system clock produces 2.5MHz, 5MHz respectively by frequency divider and gives justification and multiplexing use.
6, the TDM service implementation method based on Ethernet passive optical network according to claim 5, when it is characterized in that sign indicating number speed is adjusted to 2.5Mb/S for the TDM business datum of 2.048Mb/S, Frame F length is 224Bit, wherein filling in idle bit S is 36Bit, test bit T is 1Bit, decision bits C1 and C2 and C3 are 3Bit, and adjusting bit V is 1Bit, and valid data bit D is 183Bit; Adjust bit V and can be used for transmitting data bit, whether it transmits data bit by decision bits C1 and C2 and C3 decision.
7, the TDM service implementation method based on Ethernet passive optical network according to claim 6, it is characterized in that among the Frame F after the justification, when the value of decision bits C1 and C2 and C3 is 1, what adjust bit V transmission is the valid data bits, when the value of decision bits C1 and C2 and C3 was 0, what adjust bit V transmission was idle bit.
8, the TDM service implementation method based on Ethernet passive optical network according to claim 7, per two justification Frame F are encapsulated as an ethernet frame E when it is characterized in that described data envelope.
9, the TDM service implementation method based on Ethernet passive optical network according to claim 8 is characterized in that described ethernet frame transmits by Layer 2 switch and EPON system.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010006522A1 (en) * | 2008-07-14 | 2010-01-21 | 华为技术有限公司 | Method, device and system for transferring synchronous clocks |
| WO2016074152A1 (en) * | 2014-11-11 | 2016-05-19 | 华为技术有限公司 | Method and apparatus for processing differential clock recovery |
| CN111726166A (en) * | 2020-07-03 | 2020-09-29 | 北京航天发射技术研究所 | A kind of EPA star networking optical communication network switch and forwarding method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100421151B1 (en) * | 2002-01-17 | 2004-03-04 | 삼성전자주식회사 | Method for implementation procedure in giga bit ethernet passive optical network and ethernet frame structure thereof |
| KR100550004B1 (en) * | 2003-07-26 | 2006-02-08 | 한국전자통신연구원 | Method of accepting ONN, OLT and TMD dedicated lines in passive optical networks to accommodate TMD dedicated lines |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010006522A1 (en) * | 2008-07-14 | 2010-01-21 | 华为技术有限公司 | Method, device and system for transferring synchronous clocks |
| CN101631014B (en) * | 2008-07-14 | 2012-04-04 | 华为技术有限公司 | Method, device and system for transmitting synchronous clock |
| WO2016074152A1 (en) * | 2014-11-11 | 2016-05-19 | 华为技术有限公司 | Method and apparatus for processing differential clock recovery |
| CN106664233A (en) * | 2014-11-11 | 2017-05-10 | 华为技术有限公司 | Method and apparatus for processing differential clock recovery |
| CN111726166A (en) * | 2020-07-03 | 2020-09-29 | 北京航天发射技术研究所 | A kind of EPA star networking optical communication network switch and forwarding method |
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Inventor after: Zhang Xiande Inventor after: Zhou Zhaorong Inventor after: Chen Yanwen Inventor after: Xiong Guohui Inventor after: Xu Yong Inventor after: Zhu Yunchuan Inventor after: Jin Chaoying Inventor before: Zhang Xiande Inventor before: Zhou Zhaorong |
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Address after: 510520 Guangdong city of Guangzhou province Tianhe District high Cape Road No. 168 Patentee after: Gaoke Communication Technology Co., Ltd., Guangzhou City Address before: 510660 No. 398, Zhongshan Avenue, Guangzhou, Guangdong Patentee before: Gaoke Communication Technology Co., Ltd., Guangzhou City |
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