CN101656555A - ADSL2+ access system and velocity pre-estimating method thereof - Google Patents
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Abstract
The invention provides an ADSL2+ access system and a velocity pre-estimating method thereof and relates to the broadband access process. The velocity pre-estimating method of the ADSL2+ access systemcomprises the following steps: establishing the linkage of user line access equipment and user equipment; recording initial maximal reachable velocity reported by the user equipment before the user line access equipment carries out power adjustment, wherein the power adjustment is based on a training result of the user line access equipment and the user equipment; and carrying out the velocity pre-estimation according to the initial maximal reachable velocity. The practical communication capability of a user line can be more accurately acquired on the basis of the ADSL2+ access system and thevelocity pre-estimating method thereof.
Description
Technical field
The present invention relates to broadband access technology, particularly relate to a kind of ADSL2+ (asymmetric digital subscriber line-extended bandwidth, ADSL (Asymmetric Digital Subscriber Line) extending bandwidth second generation mode) connecting system and speed predictor method thereof.
Background technology
At present, ADSL and ADSL2+ are mainly adopted in broadband access, account for about 80% of total number of users, and especially the ADSL2+ technology is progressively replacing ADSL with downstream rate advantage under its short-distance and medium-distance and price advantage.Along with the high bandwidth business demand (as high definition IPTV (Internetprotocol television, the needs of continuous increase Web TV)) and line upkeep row barrier, how can open to the maximum of subscriber's line that speed estimates exactly is operation department problem demanding prompt solution always.
Estimate the method that extensively adopts at present for the DSL line speed and be based on speed compliance rate system, promptly by DSLAM (digital subscriber line access multiplexer, Digital Subscriber Line Access Multiplexer) network management system is gathered and is analyzed the link setup parameter of DSLAM equipment and MODEM (modulator-demodulator, modulator-demodulator) equipment.Because the speed template overwhelming majority that existing network is opened is speed limit template (being that the up-downgoing rate limit is a certain value), therefore " maximum achievable rate " parameter is mainly passed through in the assessment of line capacity.
The ADSL2+ standard consider reduce copper cable to cross talk effects and power consumption needs that reduce local side apparatus, defined PCB (Power Cutback, back-off), L2 (low-power consumption mode 2), L3 (low-power consumption mode 3) constant power is adjusted machine-processed.Particularly the application of PCB in the ADSL2+ standard compared the ADSL standard and had bigger adjusting range, and its extensive use in existing network equipment.Dispose at local side apparatus under the situations such as lower speed limit template (as less than 3Mbit/s) or free of data transmitting-receiving, if local side apparatus can suitably reduce downlink transmission power when training the signal to noise ratio remaining that draws surpassed the thresholding of setting behind link setup, or in conjunction with training the feasible speed that can satisfy the link setup template can guarantee that again current noise redundancy still satisfies the target noise remaining value requirement of setting, and is of value to the dynamic range that adapts to remote receiver again.Existence just because of PCB, and the situation that each manufacturer's chipset is supported inconsistent (different DSL nest plates, software and the design of local side ustomer premises access equipment have than big difference), during short-distance and medium-distance under a lot of situations local side be not full power transmissions, the descending achievable rate that this moment, user side MODEM calculated might not be the maximum capacity of circuit, the actual measurement maximum can 8～10Mbit/s on the low side, referring to Fig. 1.Among Fig. 1,
Situation during for descending maximum achievable rate speed limit 512Kbps (enabling PCB);
Situation during for descending maximum achievable rate speed limit 12Mbps (enabling PCB);
Situation during for descending actual link building rate (not speed limit).The parameter that is supported under the data-transmission mode owing to present most MODEM dynamically updates simultaneously, therefore the descending maximum achievable rate that causes providing has significantly decline when sending than total power, thereby the speed that the data analysis that DSLAM webmaster rate analysis system is obtained according to collection is estimated significantly is lower than the speed that reality can be opened, under the situation of the general speed limit of current speed limit template lower (descending speed limit is lower than 3Mbit/s), influenced the assessment of subscriber's line being opened the high bandwidth professional ability, the subscriber's line that causes part to have the ability to open the high bandwidth business is underestimated, waste the resource of telecommunications to a certain extent, also be unfavorable for safeguarding and arranging simultaneously the needs of barrier.
Summary of the invention
The objective of the invention is to propose a kind of speed predictor method of the ADSL2+ of being used for connecting system, to obtain maximum more accurately achievable rate parameter.
For achieving the above object, the invention provides a kind of speed predictor method of the ADSL2+ of being used for connecting system, comprising: the subscribers feeder access device is set up with subscriber equipment and is linked; The initial maximum achievable rate of described subscribers feeder access device described user equipment to report of record before carrying out the power adjustment, the foundation of wherein said power adjustment is the training result of described subscribers feeder access device and described subscriber equipment; With carry out described speed according to described initial maximum achievable rate and estimate.
In one embodiment, the speed predictor method comprises that also described subscribers feeder access device writes down the current maximum achievable rate of described user equipment to report after carrying out described power adjustment; With carry out described speed according to described initial maximum achievable rate and described current maximum achievable rate and estimate.
In one embodiment, the speed predictor method also is included in the predetermined period and by described subscribers feeder access device described initial maximum achievable rate and described current maximum achievable rate is repeatedly gathered; When the minimum value in the current maximum achievable rate of repeatedly gathering greater than described speed estimate as a result the time, the result who estimates with described speed is as the final discreet value of described subscriber's line rate capacity; With when the minimum value in a plurality of described current maximum achievable rates less than described speed estimate as a result the time, the result who estimates with described speed is the final discreet value of described subscriber's line rate capacity, and the minimum value in a plurality of described current maximum achievable rates is as the lower limit reference value of described subscriber's line rate capacity.
In one embodiment, the speed predictor method also comprises when because during the disconnection reconnecting of the described subscriber equipment that causes except described power adjustment, described subscribers feeder access device described subscriber equipment and described subscribers feeder access device rebulid link after, the initial maximum achievable rate that reports of recording user equipment again before carrying out described power adjustment.
Network management system the objective of the invention is to propose a kind of ADSL2+ connecting system, so that can be obtained maximum more accurately achievable rate parameter.
For achieving the above object, the present invention also provides a kind of ADSL2+ connecting system, it is characterized in that, comprise: the subscribers feeder access device, be used for linking with subscriber equipment foundation, described subscribers feeder access device comprises: initial maximum achievable rate record cell, be used for the initial maximum achievable rate that recording user equipment reports before carrying out the power adjustment, and the foundation of wherein said power adjustment is the training result of described subscribers feeder access device and described subscriber equipment; Estimate analytical equipment with speed, be used for carrying out speed and estimate according to described initial maximum achievable rate.
In one embodiment, described subscribers feeder access device also comprises: current maximum achievable rate record cell is used for writing down the current maximum achievable rate of described user equipment to report after carrying out described power adjustment; Described speed is estimated analytical equipment and is used for carrying out described speed according to described initial maximum achievable rate and described current maximum achievable rate and estimates.
Further, when the minimum value in the described current maximum achievable rate of repeatedly gathering greater than described speed estimate as a result the time, described speed is estimated result that analytical equipment estimates with the described speed final discreet value as described subscriber's line rate capacity.When the minimum value in a plurality of described current maximum achievable rates less than described speed estimate as a result the time, described speed is estimated result that analytical equipment estimates with the described speed final discreet value for described subscriber's line rate capacity, and the minimum value in a plurality of described current maximum achievable rates is the lower limit reference value of described subscriber's line rate capacity.
In one embodiment, described subscribers feeder access device comprises: the record updating block, be used for when because during the disconnection reconnecting of the described subscriber equipment that causes except described power adjustment, described subscriber equipment and described subscribers feeder access device rebulid link after, the initial maximum achievable rate that reports of recording user equipment again before carrying out described power adjustment.
In one embodiment, described speed is estimated analytical equipment and is integrated in the network management system that is connected with described subscribers feeder access device, or is connected with described network management system by interface.
Based on technique scheme, according to embodiments of the invention, ADSL2+ connecting system and speed predictor method can obtain the actual ability of opening of subscriber's line more accurately, reducing different DSL nest plates or device software provides the difference of parameter, the significantly reduced situation of descending maximum achievable rate acquired data values that shielding causes because of the adjustment of local side apparatus power, improve the accuracy that ADSL2+ speed is estimated, satisfy the open-minded of high bandwidth business.In addition, the present invention implements comparatively simple, flexible, and less to the modification of existing system.
Description of drawings
Accompanying drawing described herein is used to provide further explanation of the present invention, constitutes a part of the present invention.Illustrative examples of the present invention and explanation thereof only are used to explain the present invention, but do not constitute improper qualification of the present invention.In the accompanying drawings:
Fig. 1 adjusts the influence schematic diagram of mechanism to descending maximum achievable rate for PCB power.
Fig. 2 is the structural representation according to the ADSL2+ connecting system of the embodiment of the invention.
Fig. 3 is the flow chart according to the speed predictor method of the embodiment of the invention.
Fig. 4 is the flow chart of speed predictor method according to another embodiment of the present invention.
Fig. 5 is the structural representation of ADSL2+ connecting system according to another embodiment of the present invention.
Fig. 6 is the structural representation according to the ADSL2+ connecting system of further embodiment of this invention.
Embodiment
With reference to the accompanying drawings the present invention is described in more detail, exemplary embodiment of the present invention wherein is described.
Fig. 2 is the structural representation according to the ADSL2+ connecting system 200 of the embodiment of the invention.ADSL2+ connecting system 200 comprises user side MODEM 202, ADSL2+DSLAM equipment 204 and DSLAM network management system 206.
ADSL2+DSLAM equipment 204 can be finished converging of many subscriber's lines, inserts the upper strata convergence device.Send simultaneously querying command according to demand, daily record or MIB (management information base, management information bank) by ADSL2+DSLAM equipment 204 call information such as maximum achievable rate.
DSLAM network management system 206 can be connected with ADSL2+DSLAM equipment 204 by aggregation networks or dedicated network.DSLAM network management system 206 be used for to ADSL2+DSLAM equipment 204 be managed for configuration, performance management, statistic and fault management etc.In one embodiment, DSLAM network management system 206 can integrated speed be estimated analytical equipment 12, and link setup parameters such as the present rate of timing acquiring DSLAM equipment user line port and maximum achievable rate are carried out statistical analysis, finish speed and estimate function.In another embodiment, speed is estimated analytical equipment 12 and also be can be used as third party's device and link to each other with DSLAM network management system 206 by interface and call data for DSLAM network management system 206.
Fig. 3 is the flow chart according to the speed predictor method 300 of the embodiment of the invention.In step 302, the subscribers feeder access device is set up with subscriber equipment and is linked.Subscribers feeder access device (as ADSL2+DSLAM equipment) can receive the link setup requirement that subscriber equipment (as user side MODEM) is initiated, and links with subscriber equipment foundation.
In step 304, the initial maximum achievable rate that subscribers feeder access device recording user equipment before carrying out the power adjustment reports, wherein the foundation of power adjustment is the training result of subscribers feeder access device and subscriber equipment.
In step 306, carry out speed according to initial maximum achievable rate and estimate.In one embodiment, can in predetermined period, repeatedly gather initial maximum achievable rate, with the minimum value of initial maximum achievable rate or mean value as the rate capacity estimation results.When the line speed ability is estimated in analysis, can be main foundation with initial maximum achievable rate, to the initial maximum achievable rate of repeatedly gathering average, the processing of minimum value scheduling algorithm, with it as the parameter of estimating the speed statistical calculation.
Fig. 4 is the flow chart of speed predictor method 400 according to another embodiment of the present invention.The description of speed predictor method 400 combines the ADSL2+ connecting system 200 among Fig. 2, but is not limited to the form of ADSL2+ connecting system 200.
In step 402, subscriber equipment is initiated the link setup request.Can initiate to set up the request of link to ADSL2+DSLAM equipment 204 (subscribers feeder access device) such as user side MODEM 202.
In step 404, it is mutual that subscriber equipment and subscribers feeder access device are finished training parameter, the link setup success.Such as, it is mutual that user side MODEM 202 and ADSL2+DSLAM equipment 204 are finished training parameter, and successful foundation link.
In step 406, subscriber equipment calculates descending achievable rate according to training parameter.Such as, generally, user side MODEM 202 can calculate descending achievable rate, and it is according to being training interaction results with ADSL2+DSLAM equipment 204.The accuracy of the descending achievable rate that user side MODEM 202 obtains depends on the transmitted power etc. of line condition, noise circumstance and the ADSL2+DSLAM equipment 204 of training stage.
In step 408, the descending achievable rate of user equipment to report.Such as, the descending achievable rate that MODEM 202 can obtain it reports ADSL2+DSLAM equipment 204.
In step 410, the initial maximum achievable rate that subscribers feeder access device record recording user equipment reports.Such as, ADSL2+DSLAM equipment 204 is recorded in it in initial maximum achievable rate field with the descending achievable rate that daily record or MIB storehouse form storage user side MODEM 202 report.
In step 412, the subscribers feeder access device carries out the power adjustment, and wherein the foundation of power adjustment is the training result of subscribers feeder access device and subscriber equipment.Such as, ADSL2+DSLAM equipment 204 can adopt PCB, L2, L3 constant power to adjust mechanism according to training result, and transmitted power is adjusted.
In step 414, subscriber equipment recomputates descending achievable rate according to new transmitted power, and dynamically updates the descending achievable rate of subscriber equipment record.Such as, user side MODEM 202 finds that received power reduces, and can recomputate descending achievable rate, and the descending achievable rate of user side MODEM 202 records is dynamically updated.In one embodiment, user side MODEM 202 can upload descending achievable rate automatically.In another embodiment, user side MODEM 202 also can wait for after speed is estimated analytical equipment 12 initiation querying commands and upload descending achievable rate again.
In step 416, when because during the disconnection reconnecting of the subscriber equipment that causes except the power adjustment, the subscribers feeder access device subscriber equipment and subscribers feeder access device rebulid link after, the initial maximum achievable rate that reports of recording user equipment again before carrying out the power adjustment.Such as, if the disconnection reconnecting that the adjustment of non-PCB power causes takes place, ADSL2+DSLAM equipment 204 can write down initial maximum achievable rate again.(and maximum achievable rate) and the in close relations of factors such as (other nearby lines are disturbed) of crosstalking because DSL circuit link building rate wait the maximum achievable rate that causes to descend to be normal, to be to need consideration when speed is estimated if crosstalk.But the maximum achievable rate that the adjustment of PCB constant power causes descends and is equivalent to deliberately reduce maximum achievable rate, is inaccurate for estimating.Therefore, for non-PCB constant power adjustment causing disconnection reconnecting (as close on many to line to activating simultaneously, crosstalk noise enlarges markedly, perhaps user's shutdown re-powers activation etc.), can repeating step 402-416, and ADSL2+DSLAM equipment 204 can write down initial maximum achievable rate again.
In step 418, speed is estimated analytical equipment and is sent descending achievable rate acquisition.Such as, speed is estimated analytical equipment 12 can send the downstream rate acquisition to ADSL2+DSLAM equipment 204.
In step 420, the subscribers feeder access device sends descending achievable rate querying command.Can send descending achievable rate querying command to user side MODEM 202 such as ADSL2+DSLAM equipment 204.
In step 422, ustomer premises access equipment reports current descending achievable rate.Such as, user side MODEM 202 can report current descending achievable rate to ADSL2+DSLAM equipment 204.
In step 424, the current maximum achievable rate that subscribers feeder access device recording user equipment reports.Such as, ADSL2+DSLAM equipment 204 can be recorded in the data that user side MODEM 202 reports in the current maximum achievable rate field.
In step 426, the subscribers feeder access device reports initial maximum achievable rate and current maximum achievable rate.Initial maximum achievable rate and current maximum achievable rate can be reported speed such as, ADSL2+DSLAM equipment 204 and estimate analytical equipment 12.
In step 428, speed is estimated analytical equipment and is carried out speed according to initial maximum achievable rate and current maximum achievable rate and estimate.Such as, speed is estimated analytical equipment 12 and can repeatedly be gathered initial maximum achievable rate and current maximum achievable rate in predetermined period, more comprehensively to estimate the basic link setup ability of subscriber's line.On the one hand, when the line speed ability is estimated in analysis, with initial maximum achievable rate is main foundation, initial maximum achievable rate to repeatedly collection is averaged, the processing of minimum value scheduling algorithm, with it as the parameter of estimating the speed statistical calculation, with the minimum value of initial maximum achievable rate or mean value as the rate capacity estimation results.On the other hand, to estimate analytical equipment 12 be reference value with current maximum achievable rate to speed.Wherein, when the minimum value in the current maximum achievable rate of repeatedly gathering greater than speed estimate as a result the time, the result who estimates with speed is as the final discreet value of subscriber's line rate capacity; When the minimum value in a plurality of current maximum achievable rates less than speed estimate as a result the time, the result who estimates with speed is as the final discreet value of subscriber's line rate capacity, minimum value in a plurality of current maximum achievable rates is as the lower limit reference value of subscriber's line rate capacity, and result who estimates with speed and the minimum value in this current maximum achievable rate are as the rate capacity scope of subscriber's line.
Fig. 5 is the structural representation of ADSL2+ connecting system 500 according to another embodiment of the present invention.ADSL2+ connecting system 500 comprises that subscribers feeder access device 502 and speed estimates analytical equipment 504.
Subscribers feeder access device 502 is used for linking with subscriber equipment foundation.Subscribers feeder access device 502 comprises initial maximum achievable rate record cell 22, be used for the initial maximum achievable rate that recording user equipment reports before carrying out the power adjustment, wherein the foundation of power adjustment is the training result of subscribers feeder access device 502 and subscriber equipment.
Speed is estimated analytical equipment 504 and is used for carrying out speed according to initial maximum achievable rate and estimates.In one embodiment, speed is estimated analytical equipment 504 and can repeatedly be gathered initial maximum achievable rate in predetermined period.When the line speed ability is estimated in analysis, it can be main foundation with initial maximum achievable rate that speed is estimated analytical equipment 504, to the initial maximum achievable rate of repeatedly gathering average, the processing of minimum value scheduling algorithm, with it as the parameter of estimating the speed statistical calculation.
Fig. 6 is the structural representation according to the ADSL2+ connecting system 600 of further embodiment of this invention.ADSL2+ connecting system 600 comprises that subscribers feeder access device 602, speed estimates analytical equipment 604.
Subscribers feeder access device 602 is used for linking with subscriber equipment foundation.Subscribers feeder access device 602 comprises initial maximum achievable rate record cell 32, current maximum achievable rate record cell 34 and record updating block 36.Initial maximum achievable rate record cell 32 is used for the initial maximum achievable rate that recording user equipment reports before carrying out the power adjustment, and wherein the foundation of power adjustment is the training result of subscribers feeder access device 602 and subscriber equipment.Current maximum achievable rate record cell 34 is used for the current maximum achievable rate that recording user equipment reports after carrying out the power adjustment.Record updating block 36 is used for when owing to the disconnection reconnecting of the subscriber equipment that causes except the power adjustment, subscriber equipment and subscribers feeder access device 602 rebulid link after, the initial maximum achievable rate that reports of recording user equipment again before carrying out the power adjustment.
Speed is estimated analytical equipment 604 and is used for carrying out speed according to initial maximum achievable rate and current maximum achievable rate and estimates.When the minimum value in the current maximum achievable rate of repeatedly gathering greater than speed estimate as a result the time, speed is estimated result that analytical equipment estimates with the speed final discreet value as the subscriber's line rate capacity; When the minimum value in a plurality of current maximum achievable rates less than speed estimate as a result the time, speed is estimated result that analytical equipment estimates with the speed final discreet value as the subscriber's line rate capacity, minimum value in a plurality of current maximum achievable rates is as the lower limit reference value of subscriber's line rate capacity, and result who estimates with speed and the minimum value in this current maximum achievable rate are as the rate capacity scope of subscriber's line.Speed is estimated analytical equipment 604 and can be integrated in the network management system that is connected with subscribers feeder access device 602, or is connected with network management system by interface.
According to embodiments of the invention, ADSL2+ connecting system and speed predictor method can obtain the actual ability of opening of subscriber's line more accurately, reducing different DSL nest plates or device software provides the difference of parameter, the significantly reduced situation of descending maximum achievable rate acquired data values that shielding causes because of the adjustment of local side apparatus power, improve the accuracy that ADSL2+ speed is estimated, satisfy the open-minded of high bandwidth business.In addition, the present invention implements comparatively simple, flexible, and less to the modification of existing system.
Description of the invention provides for example with for the purpose of describing, and is not exhaustively or limit the invention to disclosed form.Such as, above the embodiment of Miao Shuing is mainly used in the ADSL2+ connecting system, and is suitable for too for the present invention of ADSL connecting system.Many modifications and variations are obvious for the ordinary skill in the art.Selecting and describing embodiment is for better explanation principle of the present invention and practical application, thereby and makes those of ordinary skill in the art can understand the various embodiment that have various modifications that the present invention's design is suitable for special-purpose.
Claims (9)
1. a speed predictor method that is used for the ADSL2+ connecting system is characterized in that, comprising:
The subscribers feeder access device is set up with subscriber equipment and is linked;
The initial maximum achievable rate of described subscribers feeder access device described user equipment to report of record before carrying out the power adjustment, the foundation of wherein said power adjustment is the training result of described subscribers feeder access device and described subscriber equipment; With
Carrying out described speed according to described initial maximum achievable rate estimates.
2. speed predictor method according to claim 1 is characterized in that, also comprises:
Described subscribers feeder access device writes down the current maximum achievable rate of described user equipment to report after carrying out described power adjustment; With
Carrying out described speed according to described initial maximum achievable rate and described current maximum achievable rate estimates.
3. speed predictor method according to claim 2 is characterized in that, also comprises:
In predetermined period, described initial maximum achievable rate and described current maximum achievable rate are repeatedly gathered by described subscribers feeder access device;
When the minimum value in the current maximum achievable rate of repeatedly gathering greater than described speed estimate as a result the time, the result who estimates with described speed is as the final discreet value of subscriber's line rate capacity; With
When the minimum value in a plurality of described current maximum achievable rates less than described speed estimate as a result the time, the result who estimates with described speed is as the final discreet value of subscriber's line rate capacity, with the lower limit reference value of the minimum value in a plurality of described current maximum achievable rates as described subscriber's line rate capacity.
4. speed predictor method according to claim 1 is characterized in that, comprising:
When because during the disconnection reconnecting of the described subscriber equipment that causes except described power adjustment, described subscribers feeder access device described subscriber equipment and described subscribers feeder access device rebulid link after, the initial maximum achievable rate that reports of recording user equipment again before carrying out described power adjustment.
5. an ADSL2+ connecting system is characterized in that, comprising:
The subscribers feeder access device is used for linking with subscriber equipment foundation, and described subscribers feeder access device comprises:
Initial maximum achievable rate record cell is used for the initial maximum achievable rate that recording user equipment reports before carrying out the power adjustment, and the foundation of wherein said power adjustment is the training result of described subscribers feeder access device and described subscriber equipment; With
Speed is estimated analytical equipment, is used for carrying out speed according to described initial maximum achievable rate and estimates.
6. ADSL2+ connecting system according to claim 5 is characterized in that, described subscribers feeder access device also comprises:
Current maximum achievable rate record cell is used for writing down the current maximum achievable rate of described user equipment to report after carrying out described power adjustment;
Described speed is estimated analytical equipment and is used for carrying out described speed according to described initial maximum achievable rate and described current maximum achievable rate and estimates.
7. ADSL2+ connecting system according to claim 6 is characterized in that,
When the minimum value in the described current maximum achievable rate of repeatedly gathering greater than speed estimate as a result the time, described speed is estimated result that analytical equipment estimates with the described speed final discreet value as the subscriber's line rate capacity;
When the minimum value in a plurality of described current maximum achievable rates less than described speed estimate as a result the time, described speed is estimated result that analytical equipment estimates with the described speed final discreet value as described subscriber's line rate capacity, with the lower limit reference value of the minimum value in a plurality of described current maximum achievable rates as described subscriber's line rate capacity.
8. ADSL2+ connecting system according to claim 5 is characterized in that, described subscribers feeder access device comprises:
The record updating block, be used for when because during the disconnection reconnecting of the described subscriber equipment that causes except described power adjustment, described subscriber equipment and described subscribers feeder access device rebulid link after, the initial maximum achievable rate that reports of recording user equipment again before carrying out described power adjustment.
9. ADSL2+ connecting system according to claim 5 is characterized in that, described speed is estimated analytical equipment and is integrated in the network management system that is connected with described subscribers feeder access device, or is connected with described network management system by interface.
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| CN104219172A (en) * | 2013-05-29 | 2014-12-17 | 中国电信股份有限公司 | Method and system of acquiring maximum service data rate of digital subscriber loop |
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| CA2359305A1 (en) * | 2001-10-19 | 2003-04-19 | Andrew Deczky | A method and system for l2 power saving mode for adsl |
| US6826258B2 (en) * | 2002-06-20 | 2004-11-30 | Teradyne, Inc. | System and method for pre-qualification of telephone lines for DSL service using an average loop loss |
| US8406135B2 (en) * | 2005-07-29 | 2013-03-26 | British Telecommunications Public Limited Company | Method and apparatus for communicating data over a data network |
| CN101047459B (en) * | 2006-05-19 | 2011-05-04 | 华为技术有限公司 | Method for dynamic managing xDSL specturm and its device |
| CN101072047B (en) * | 2007-06-11 | 2010-07-28 | 江苏省电信有限公司南京分公司 | DSLAN port fast detecting device |
| CN101141358B (en) * | 2007-10-26 | 2010-06-09 | 中国电信股份有限公司 | Method and system of preestimating DSL maximum linking velocity |
| CN101465672B (en) * | 2007-12-21 | 2012-11-21 | 华为技术有限公司 | Method, device and system for reducing crossfire of digital customer line |
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| CN104219172A (en) * | 2013-05-29 | 2014-12-17 | 中国电信股份有限公司 | Method and system of acquiring maximum service data rate of digital subscriber loop |
| CN104219172B (en) * | 2013-05-29 | 2017-11-03 | 中国电信股份有限公司 | The acquisition methods and system of DSL maximum traffic data rate |
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