CN101198190A - Calibration method for Gigabit passive optical network packaging mode frame user data - Google Patents
Calibration method for Gigabit passive optical network packaging mode frame user data Download PDFInfo
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- CN101198190A CN101198190A CNA2008100559782A CN200810055978A CN101198190A CN 101198190 A CN101198190 A CN 101198190A CN A2008100559782 A CNA2008100559782 A CN A2008100559782A CN 200810055978 A CN200810055978 A CN 200810055978A CN 101198190 A CN101198190 A CN 101198190A
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Abstract
The invention discloses a check method for user data of gigabit passive optical network (PON) packaging mode frame, wherein the method includes the following steps: user data CRC check is set in a GEM frame and the GEM frame is transmitted; a CRC check code of the received user data is generated and is compared with the CRC check bit in the received GEM frame; if the CRC check code is identical to the CRC check bit, the receiving is correct; otherwise, the receiving is wrong. The invention completes the extension of the GEM frame format on the basis of the ITU-T G.984.3 and increases a user data check code in the GEM frame; moreover, a receiving end generates a check code of the user data according to the algorithm specified by the ITU-T Rec. I.363.5 and compares the check code with the check code generated by a transmitting end. The invention realizes user data check in the GEM frame to improve the error detection capability and transmission reliability of the GEM frame.
Description
Technical field
The present invention relates to gigabit passive optical network (GPON, Gigabit Passive Optical Network) field, the method for calibration of particularly a kind of G-PON Encapsulation Mode (GEM, GPON Encapsulation Method) frame user data.
Background technology
GPON is based on the G.984.x comprehensive access technology of new generation broadband passive light of standard of ITU-T, system is usually by OLT (the Optical Line Terminal of office's side, optical line terminal), the ONU of user side (OpticalNetwork Unit, optical network unit)/ONT (Optical Network Termination, Optical Network Terminal) and ODN (Optical Distribution Network, Optical Distribution Network) form.ODN is made up of Passive Optical Components such as monomode fiber and optical branching device, optical connectors, for the physical connection between OLT and the ONU provides light-transmitting medium.ODN is generally and a little arrives multipoint configuration, and promptly an OLT connects a plurality of ONU.The data that OLT mails to ONU are called downlink data, and the data that ONU mails to OLT are called upstream data.
The payload part of GPON system uplink/downlink frames has two types: asynchronous transfer mode (ATM, Asynchronous Transfer Mode) cell and G-PON Encapsulation Mode (GEM, GPONEncapsulation Method) frame.
Concrete, the GEM frame format as shown in Figure 1, comprise GEM frame head and payload section, wherein, the GEM frame head is by the payload length indication (PLI of 12bit, Payload Length Indicator), four fields of the header error of the payload type of the payload of 12bit sign (Port ID), 3bit indication (PTI, Payload Type Identifier) and 13bit control (HEC, Header Error Control) are formed.The PLI field is the payload section length L of unit indication frame head back with the byte; The Port id field is used to provide 4096 different traffic stream identifier among the PON, and is multiplexing to realize Business Stream; Pti field is used to the content type and the corresponding processing mode of the section of indication payload, and general payload mainly contains two types of user data and GEM OAM; The HEC field is used to provide the EDC error detection and correction function of frame head.
The GEM frame provides verification to frame head by the HEC field, but the verification means to payload section especially user data are not provided, and can make troubles under some occasion.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of method of calibration of GEM frame user data, can strengthen the error detecing capability of GEM frame.
For achieving the above object, technical scheme of the present invention is achieved in that
A kind of method of calibration of Gigabit passive optical network packaging mode frame user data, this method comprises:
A, transmitting terminal are provided with CRC check to the user data that needs verification, send the GEM frame;
B, receiving terminal carry out verification to the user data in the receiving GEM frame when receiving the GEM frame of band CRC check sign indicating number.
Steps A further comprises:
A1, transmitting terminal are provided with in the frame head pti field two to the GEM frame that needs the user data verification and reserve coding and be used to indicate the user data mode of extension;
A2, transmitting terminal generate the CRC check sign indicating number of user data;
A3, transmission have the GEM frame of CRC check sign indicating number.
Be provided with described in the steps A 1 and be specially:
PTI is set is encoded to 010, the user data segment of expression tape verifying sign indicating number is not a postamble; PTI is set is encoded to 011, the user data segment of expression tape verifying sign indicating number is a postamble.
Step B further comprises:
After B1, receiving terminal are received the GEM frame, judge whether pti field is 010 or 011 in this frame, if, then enter step B2, otherwise, do not carry out the user data CRC check, finish current handling process;
B2, receiving terminal generate the CRC check sign indicating number to user data in the GEM frame that receives, and with the GEM frame of being received in the CRC check sign indicating number relatively, if identical, then receive correctly, otherwise receive mistake.
G.984.3, the present invention expands the GEM frame format on the basis at ITU-T, in the GEM frame, increase the user data check code, by ITU-T Rec.I.363.5 regulation algorithm user data is generated check code by receiving terminal, and compare with check code that transmitting terminal generates, realized verification to user data in the GEM frame, and then strengthened the error detecing capability of GEM frame, improved the reliability of GEM frame transmission.Be to keep the compatibility with existing equipment, the present invention uses in the GEM frame head pti field two to reserve the CRC check sign indicating number that coding is indicated GEM frame band user data, realizes simplyr, changes littler.
Description of drawings
G.984.3, the GEM frame format schematic diagram that Fig. 1 stipulates for existing ITU-T;
Fig. 2 is the flow chart of the inventive method;
Fig. 3 is the GEM frame format schematic diagram after the present invention expansion.
Embodiment
The present invention realizes the verification to the GEM frame user data by the GEM frame format is expanded, thereby guarantees the correctness of the user data of reception.
Below in conjunction with specific embodiment GEM frame user data method of calibration of the present invention is described, as shown in Figure 2, may further comprise the steps:
Step 1: the user data CRC check is set, sends the GEM frame.
Transmitting terminal is used to indicate the user data mode of extension with the coding (010,011) of two reservations in the GEM frame head pti field, wherein:
PTI is encoded at 010 o'clock, and the user data segment of expression tape verifying sign indicating number is not a postamble;
PTI is encoded at 011 o'clock, and the user data segment of expression tape verifying sign indicating number is a postamble.
When GEM frame head pti field is encoded to 010 or 011, G.984.3, GEM frame head form is stipulated with ITU-T, payload part form in the GEM frame as shown in Figure 3, cyclic redundancy bit check (the CRC that comprises user data and 32bit, Cycle Redundancy Check) field, crc field is pressed ITU-TRec.I.363.5 regulation algorithm by transmitting terminal user data is calculated generation.
Setting is finished, and transmitting terminal sends to receiving terminal with the GEM frame of expansion.
Step 2: receiving terminal generates the CRC check sign indicating number to the user data that receives, and with the CRC check bit comparison that receives, if identical, then receive correctly, otherwise receive mistake.
Receiving terminal is to the user data in the GEM frame that receives, the same ITU-T Rec.I.363.5 regulation algorithm of press generates the CRC check sign indicating number, compares with this and the crc field that receives and realizes verification to user data, if identical, then receive correctly, otherwise receive mistake.
In addition, the implication of PTI coding 010 and 011 also can be changed.The present invention can also increase the option of compatible existing verification mode when transmitting terminal is provided with, when promptly not needing to use the verification of GEM frame user data, and GEM frame format and pti field coding that transmitting terminal uses ITU-T G.984.3 to stipulate; Like this, when receiving terminal is received the GEM frame, judge at first whether the pti field coded format is 010 or 011, if, adopt the mode checking data of step 1 to 2, otherwise, only by the existing mode checking data.
The above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention.
Claims (4)
1. the method for calibration of a Gigabit passive optical network packaging mode frame user data is characterized in that, this method comprises:
A, transmitting terminal are provided with CRC check to the user data that needs verification, send the GEM frame;
B, receiving terminal carry out verification to the user data in the receiving GEM frame when receiving the GEM frame of band CRC check sign indicating number.
2. the method for calibration of Gigabit passive optical network packaging mode frame user data according to claim 1 is characterized in that, steps A further comprises:
A1, transmitting terminal are provided with in the frame head pti field two to the GEM frame that needs the user data verification and reserve coding and be used to indicate the user data mode of extension;
A2, transmitting terminal generate the CRC check sign indicating number of user data;
A3, transmission have the GEM frame of CRC check sign indicating number.
3. the method for calibration of Gigabit passive optical network packaging mode frame user data according to claim 2 is characterized in that, is provided with described in the steps A 1 to be specially:
PTI is set is encoded to 010, the user data segment of expression tape verifying sign indicating number is not a postamble; PTI is set is encoded to 011, the user data segment of expression tape verifying sign indicating number is a postamble.
4. the method for calibration of Gigabit passive optical network packaging mode frame user data according to claim 3 is characterized in that, step B further comprises:
After B1, receiving terminal are received the GEM frame, judge whether pti field is 010 or 011 in this frame, if, then enter step B2, otherwise, do not carry out the user data CRC check, finish current handling process;
B2, receiving terminal generate the CRC check sign indicating number to user data in the GEM frame that receives, and with the GEM frame of being received in the CRC check sign indicating number relatively, if identical, then receive correctly, otherwise receive mistake.
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| Application Number | Priority Date | Filing Date | Title |
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| CNA2008100559782A CN101198190A (en) | 2008-01-03 | 2008-01-03 | Calibration method for Gigabit passive optical network packaging mode frame user data |
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| CNA2008100559782A CN101198190A (en) | 2008-01-03 | 2008-01-03 | Calibration method for Gigabit passive optical network packaging mode frame user data |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101867849A (en) * | 2009-04-18 | 2010-10-20 | 中兴通讯股份有限公司 | Gigabit passive optical network system multiple protocols bearing method and encapsulation mode frame thereof |
| CN102055727A (en) * | 2009-10-30 | 2011-05-11 | 华为技术有限公司 | Data encapsulation method, encapsulation equipment and branch unit in multi-service transport network |
| CN102439874A (en) * | 2009-10-30 | 2012-05-02 | 华为技术有限公司 | Method for transmitting downlink frames in optical network and related apparatus thereof |
| CN103430471A (en) * | 2011-03-30 | 2013-12-04 | 瑞典爱立信有限公司 | Error handling in passive optical network |
| CN108353190A (en) * | 2015-11-02 | 2018-07-31 | 杜比实验室特许公司 | The layer representation containing CRC code of high dynamic range video and transmission |
| CN110224887A (en) * | 2019-06-04 | 2019-09-10 | 北京挚友科技有限公司 | A kind of method and apparatus of Ethernet Y.1564 test frame automatic identification |
| CN114337929A (en) * | 2022-01-05 | 2022-04-12 | 深圳市泛海三江科技发展有限公司 | High-reliability communication verification method |
-
2008
- 2008-01-03 CN CNA2008100559782A patent/CN101198190A/en active Pending
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101867849A (en) * | 2009-04-18 | 2010-10-20 | 中兴通讯股份有限公司 | Gigabit passive optical network system multiple protocols bearing method and encapsulation mode frame thereof |
| CN102055727A (en) * | 2009-10-30 | 2011-05-11 | 华为技术有限公司 | Data encapsulation method, encapsulation equipment and branch unit in multi-service transport network |
| CN102439874A (en) * | 2009-10-30 | 2012-05-02 | 华为技术有限公司 | Method for transmitting downlink frames in optical network and related apparatus thereof |
| CN102055727B (en) * | 2009-10-30 | 2013-06-26 | 华为技术有限公司 | Data encapsulation method, encapsulation equipment and branch unit in multi-service transport network |
| CN102439874B (en) * | 2009-10-30 | 2015-03-25 | 华为技术有限公司 | Method for transmitting downlink frames in optical network and related apparatus thereof |
| CN103430471A (en) * | 2011-03-30 | 2013-12-04 | 瑞典爱立信有限公司 | Error handling in passive optical network |
| CN103430471B (en) * | 2011-03-30 | 2016-12-21 | 瑞典爱立信有限公司 | Fault processing in EPON |
| CN108353190A (en) * | 2015-11-02 | 2018-07-31 | 杜比实验室特许公司 | The layer representation containing CRC code of high dynamic range video and transmission |
| US10701399B2 (en) | 2015-11-02 | 2020-06-30 | Dolby Laboratories Licensing Corporation | Layered representation and delivery of high dynamic range video |
| CN108353190B (en) * | 2015-11-02 | 2021-01-12 | 杜比实验室特许公司 | Apparatus, method, and computer-readable storage medium for generating video data |
| CN110224887A (en) * | 2019-06-04 | 2019-09-10 | 北京挚友科技有限公司 | A kind of method and apparatus of Ethernet Y.1564 test frame automatic identification |
| CN114337929A (en) * | 2022-01-05 | 2022-04-12 | 深圳市泛海三江科技发展有限公司 | High-reliability communication verification method |
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