CN102447510A - Adjusting method of uplink sending time window in EPON system - Google Patents
Adjusting method of uplink sending time window in EPON system Download PDFInfo
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- CN102447510A CN102447510A CN2010105030077A CN201010503007A CN102447510A CN 102447510 A CN102447510 A CN 102447510A CN 2010105030077 A CN2010105030077 A CN 2010105030077A CN 201010503007 A CN201010503007 A CN 201010503007A CN 102447510 A CN102447510 A CN 102447510A
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- onu
- time
- adjusting method
- laser
- time window
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Abstract
The invention discloses an adjusting method of an uplink sending time window in an Ethernet optical network (EPON) system. An ONU in the EPON system is an IEEE 802.3 standard state machine. According to the adjusting method, a time label of sending data to an OLT by the ONU local is set as a result obtained by the following formula: original sending time (t1) of an ONU local MPCP clock + starting time of a laser + synchronizing time, so that normal data can be sent delayedly by the ONU. According to the adjusting method provided in the invention, an ONU can delayedly send normal data; it can be ensured that the ONU sends data in a correct time window; and a conflict between adjacent ONUs can be avoided.
Description
Technical field
The present invention relates to the method for adjustment of up transmitting time window in a kind of EPON system.
Background technology
In the Ethernet passive optical network (EPON, Ethernet Optical Network), OLT adopts the uplink communication of a plurality of ONU of TDM mode control and management to OLT.OLT is that the ONU of each registration distributes ascending time slot, and sends common mandate frame (Normal GATE) to ONU, and ONU can only open laser and send data with burst mode to OLT in the time slot of the common mandate frame appointment that receives.In not one's own time slot, ONU will close laser, in order to avoid other ONU on the same link is produced interference.
OLT distributes ascending time slot for every ONU based on grade of service configuration and ONU flow situation reporting information.ONU opens laser when time slot begins, after laser was opened, the code word to OLT transmission appointment so that OLT does synchronously, began to send normal data afterwards, closes sharp device afterwards.Must guarantee that laser can cut out fully before time slot finishes.Otherwise the possibility that has conflict between the adjacent ONU.
Clock with OLT is a coordinate; In order to guarantee that data can arrive at correct time slot; And with between adjacent ONU do not produce and conflict; The moment that OLT requires ONU to deduct loop time delay in its time slot time started is opened laser, passes through loop time delay (uplink time delay and descending time delay sum) so afterwards, can be identical with the time point of opening laser of OLT expection.With the ONU1 among Fig. 1 is example, and ONU1 need be at (the t of ONU1
0-RTT1) moment is opened laser, when passing to OLT, looks like at t at OLT like this
0The laser of constantly opening.But in the standard state machine of IEEE 802.3, ONU begins to send normal data at " expecting that initial moment-RTT constantly ", can cause holding before the time point of laser prominent to time window outside like this, causes the whole reach of time window.If the laser of all ONU is opened, the pass time is all the same, all whole reach laser of all ONU transmitting time windows opening time+lock in time, at this moment face mutually can not produce between the ONU dash empty.If the laser between the ONU is opened, the pass time is all different, just has the possibility of conflict.
Summary of the invention
The technical problem that the present invention will solve provides the method for adjustment of up transmitting time window in a kind of EPON system, and its standard state machine that can be used for IEEE 802.3 is avoided producing conflict before the adjacent ONU.
For solving the problems of the technologies described above; The method of adjustment of up transmitting time window in the EPON of the present invention system; ONU in this EPON system is the standard state machine of IEEE 802.3, and it is: said ONU this locality is set to the time tag that OLT sends data: the original transmitting time (t of the local MPCP clock of ONU
1)+laser time started+lock in time, make the ONU time-delay send normal data.
Method of adjustment of the present invention; Through ONU is added a side-play amount to the time tag that OLT sends data: laser opening time+lock in time; Make ONU time-delay send normal data, guarantee that ONU sends data in correct time window, avoid producing conflict between the adjacent ONU.
Description of drawings
Below in conjunction with accompanying drawing and embodiment the present invention is done further detailed explanation:
Fig. 1 is the sketch map of uplink data sending in the EPON system;
Fig. 2 is the sketch map of change time tag among the ONU.
Embodiment
In the EPON system for the ONU standard state machine that solves above-mentioned employing IEEE 802.3, there is the problem of conflict between the adjacent ONU, following solution is arranged.
Solution provided by the invention is the time tag of change ONU.ONU is through the technology of change time tag, and ONU this locality is set to the time tag that OLT sends data: the local MPCP clock of ONU t
1(the local original moment of sending data of ONU)+laser time started+lock in time.This time tag is set in the time tag territory of the local MPCP frame of ONU.Through above-mentioned setting, make the loop time delay RTT of actual measurement
Actual measurementLoop time delay RTT less than reality
Actual, RTT wherein
ActualFor the loop that does not have change is delayed time, and RTT
Real SurveyBe the time-delay of the loop after the change, RTT
Actual measurement+ laser opening time+lock in time=RTT
ActualMake ONU in that " ONU expects initial moment t
0-RTT
Actual measurement" constantly send normal data, so just can reach the effect that normal data is sent in time-delay.And in the way of existing standard, the local MPCP clock of time tag=ONU t
1
Fig. 2 is a sketch map, in the way of existing standard, and loop time delay RTT=t
2-t
Label=t
2-t
1And in the method for the invention, behind the time tag of modification ONU side, loop time delay RTT=t
2-t
Label=t
2-t
1-laser time started-lock in time.Make RTT like this
Actual measurementLess than RTT
ActualThereby, play the effect that time-delay is sent.Since with control laser switch and the time-delay FIFO that sends synchronous code in up path, so laser opening time+lock in time is smaller or equal to the up path time delay.Therefore, the RTT behind the modification time label
Actual measurementIt can not negative.
Claims (2)
1. the method for adjustment of up transmitting time window in the EPON system; ONU in this EPON system is the standard state machine of IEEE 802.3, it is characterized in that: said ONU this locality is set to the time tag that OLT sends data: the original transmitting time (t of the local MPCP clock of ONU
1)+laser time started+lock in time, make said ONU time-delay send normal data.
2. according to the described method of adjustment of claim 1, it is characterized in that: said time tag is set in the time tag territory of the local MPCP frame of said ONU.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010105030077A CN102447510A (en) | 2010-10-11 | 2010-10-11 | Adjusting method of uplink sending time window in EPON system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105030077A CN102447510A (en) | 2010-10-11 | 2010-10-11 | Adjusting method of uplink sending time window in EPON system |
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| CN102447510A true CN102447510A (en) | 2012-05-09 |
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| CN2010105030077A Pending CN102447510A (en) | 2010-10-11 | 2010-10-11 | Adjusting method of uplink sending time window in EPON system |
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Cited By (3)
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| CN104335541A (en) * | 2013-05-28 | 2015-02-04 | 华为技术有限公司 | Method for adjusting physical frame boundary, related device, and system |
| CN109257243A (en) * | 2017-07-14 | 2019-01-22 | 深圳市中兴微电子技术有限公司 | A kind of round-trip delay determines method, apparatus and computer readable storage medium |
| CN111866621A (en) * | 2019-04-25 | 2020-10-30 | 上海诺基亚贝尔股份有限公司 | Clock circuit management method, apparatus and computer readable medium |
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| CN104335541A (en) * | 2013-05-28 | 2015-02-04 | 华为技术有限公司 | Method for adjusting physical frame boundary, related device, and system |
| CN109257243A (en) * | 2017-07-14 | 2019-01-22 | 深圳市中兴微电子技术有限公司 | A kind of round-trip delay determines method, apparatus and computer readable storage medium |
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| US11294335B2 (en) | 2019-04-25 | 2022-04-05 | Nokia Solutions And Networks Oy | Method, device and computer-readable medium of managing a clock circuit |
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Application publication date: 20120509 |