CN1719847A - Line grabbing method for testing digital user line and its apparatus - Google Patents
Line grabbing method for testing digital user line and its apparatus Download PDFInfo
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- CN1719847A CN1719847A CN 200410071513 CN200410071513A CN1719847A CN 1719847 A CN1719847 A CN 1719847A CN 200410071513 CN200410071513 CN 200410071513 CN 200410071513 A CN200410071513 A CN 200410071513A CN 1719847 A CN1719847 A CN 1719847A
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Abstract
This invention relates to a grasping-line method and its device of digital user line for testing, which separates traditional phone service signals with digital user line signals in the transmission line of DSLAM with s low pass filter module, then connects the circuits carrying the traditional phone call service signals and/or digital user line signals into a test circuit to realize related grasping line operation.
Description
Technical field
The present invention relates to electronic technology field, relate in particular to a kind of line grabbing method for testing digital user line and device thereof.
Background technology
Since xDSL (Digital Subscriber Line) technology is come out, because it utilizes existing copper cash resource that the business of high bandwidth is provided, can protect the investment of operator effectively, for the client provides broadband services, therefore obtain flourish in all parts of the world.Wherein towards personal user's ADSL (ADSL (Asymmetric Digital Subscriber Line)) because be fit to very much the asymmetrical characteristics of individual wideband switch-in business data traffic,, thereby treat with leniency the personal user and to insert application facet and occupy absolute predominance to the data volume of CPE (family end) (being called down direction) quantity from CO (local side) much larger than up (from CPE to CO).At present, multimedia services such as the high speed Internet access that ADSL provides, video traffic have been widely used, and ADSL business and POTS (plain old telephone service) become the important service that PSTN (public switched telephone network (PSTN)) network provides jointly.And, along with the user to inserting the further increase of bandwidth demand, can provide higher bandwidth and more the access technology VDSL of flexible allocation upstream and downstream bandwidth (Very-high-speed Digital Subscriber Line) will be applied.
ADSL and VDSL use than the higher frequency of black phone signal band (3.4KHz is following), wherein the frequency band range of ADSL is 25.875KHz～1104KHz, ADSL2+ then uses 25.875KHz～2208KHz, and VDSL might use the frequency band from 25KHz～30MHz.Because xDSL and the different frequency band of the professional use of POTS, therefore can be defeated same phone line, transceiver at two ends uses simple filter just the two can be separated, this filter is called separator (Splitter) again in ADSL and VDSL, separator is isolated to be the POTS service signal, and the output that promptly separates 0 device links to each other with PSTN.Concentrating in communication network provides the equipment of multi-channel A SL, VDSL business to be called DSL couple in multiplexer (being DSLAM, Digital Subscriber Line Access Multiplexer).Corresponding ADSL and VDSL system reference model are as shown in Figure 1, the output of DSLAM can be respectively and plain old telephone and xTU-R (xDSL far-end unit), then be provided with xTU-C (xDSL local side unit) among the DSLAM, described DSLAM also links to each other with NMS (network management system).
Along with the rapid expansion that xDSL uses scale, system maintenance become more and more come important.Because xDLS uses the frequency range higher than POTS business, thereby higher than POTS for the requirement of circuit; And the original design of twisted-pair feeder is to be used for the POTS business, and therefore, not all circuit of telephone service that can provide is fit to operation xDSL.DSLAM and xDSL terminal make that also the relevant device of PSTN is more complicated in addition.Therefore, test is provided for the accident analysis and the location of xDSL equipment automatically, provides the system maintenance means to seem extremely important.
XDSL system Auto-Test System mainly comprises line grabbing device and test circuit.Usually xDSL system Auto-Test System mainly provides following function: to the test of local side (being xTU-C), to the test of terminal (being xTU-R) and to the test of circuit.In order to realize described each test function, need local side, circuit and terminal to be switched to respectively on the test macro (being test circuit) respectively, the process of this switching promptly is called grabs line, is reference with the local side unit, interior survey is also named in test to local side, cries outer the survey again to circuit and terminal test; Also having a kind of test in addition is monitoring to the xDSL circuit of normal operation, does not influence the professional normal operation with the POTS business of xDSL when requiring test.As shown in Figure 2, usually the Auto-Test System inside of DSLAM has two cover buses to be used for test, and a cover is interior survey bus, and a cover is the outer bus of surveying, and in fact what is called is grabbed line is exactly that port to be measured is transferred to process on the inside and outside test bus.Owing to also carry the POTS business on the xDSL circuit, therefore test is grabbed line and should be tried one's best and do not influence arrowband POTS business.Consider that in addition (circuit that CLEC rents ILEC provides broadband services for the circuit relation of renting between some national ILEC (traditional local exchange company) and the CLEC (all kinds of private networks outside the telecommunications), ILEC also provides the POTS business on the same line road), some ILEC also has the narrowband test equipment of oneself, therefore also require when ILEC carries out line test, the broadband part can not had any impact by bypass.
Realize that above-mentioned test grabs the functional module of line and be called for short and grab wire module, realize by relay matrix usually.Currently usedly a kind ofly grab wire module as shown in Figure 2, what provide among the figure as can be seen grabs wire module or claims line grabbing device only can provide the line of grabbing of partial test function to operate, and grabbing the line operation and also may have influence on the business of normally carrying out in the communication network for partial test function wherein, therefore, can't satisfy the needs of broadband test (being testing digital user line) well.
Summary of the invention
In view of above-mentioned existing in prior technology problem, the purpose of this invention is to provide a kind of line grabbing method for testing digital user line and device thereof, thereby use less relay just can realize testing needed every line operation of grabbing, and can guarantee that the Plain Old Telephone Service of normally carrying out in the communication network do not grabbed the influence of line operation.
The objective of the invention is to be achieved through the following technical solutions:
The invention provides a kind of line grabbing method for testing digital user line, comprising:
Plain Old Telephone Service Signal Separation in the transmission line of DSLAM (Digital Subscriber Line Access Multiplexer) is come out;
Needs according to test will only carry the Plain Old Telephone Service signal respectively, and the transmission line that carries digital subscriber line signal and Plain Old Telephone Service signal is connected in the test circuit.
The present invention also provides a kind of testing digital user line line grabbing device based on said method, comprising:
Low-pass filtering module: be connected in the transmission line of DSLAM, be used for the Plain Old Telephone Service Signal Separation of transmission line is come out, obtain only to have the circuit that carries the Plain Old Telephone Service signal;
Relay: be arranged at transmission line respectively, and the circuit that carries the Plain Old Telephone Service signal is only arranged, the signal line that need grasp by the on off state control figure subscriber line test of each relay.
Described testing digital user line also comprises with line grabbing device:
Busy not busy detection module: be used for the circuit that carries the Plain Old Telephone Service signal when grasping, and when this signal monitored or test, whether have the Plain Old Telephone Service signal that is transmitting in the detection line, and the output testing result.
Described busy not busy detection module and described low-pass filtering module can make up and be set to a module and be connected in the transmission line, also can independently separately be provided with to be connected in the transmission line.
Described relay has three, relay one is connected between local side transmission line and the test circuit, relay two is connected in test circuit and terminal transmission circuit, relay three is connected between the circuit and the circuit between relay two and test circuit between relay one and test circuit, and described low-pass filtering module is connected with relay three.
Described relay one and relay two are dpdt relay, and described relay one and two on relay are provided with direct-connected path.
Described testing digital user line is with in the line grabbing device:
In needs carry out, survey when grabbing line:
Described relay one switched to test circuit be communicated with the position, described relay two remains on the terminal transmission circuit and is communicated with the position;
Outside needs carry out, survey when grabbing line:
Relay three is connected, and relay two switches to respectively with test circuit and is communicated with the position;
When needs carry out inside and outside survey and grab line:
Survey is grabbed line and is grabbed the line operation with outer the survey in carrying out simultaneously;
When needs carry out the test of outside line arrowband low-frequency parameter and grab line:
Relay one and relay two switch to respectively with test circuit and are communicated with the position, and relay three is connected, and simultaneously, described busy not busy detection module starts, if line be busy, accident low-frequency parameter then, otherwise, carry out the test of low-frequency parameter.
Described testing digital user line is with in the line grabbing device, if be provided with the separator that links to each other with PSTN (public switched telephone network (PSTN)) in the transmission line of described DSLAM, then this device also comprises relay four, and described relay four is connected between described separator and the terminal transmission circuit.
In the device of the present invention:
When needs carry out PSTN (public switched telephone network (PSTN)) test and grab line:
Relay two switches to test circuit and is communicated with the position, relay four closed connections;
And, in carrying out, survey by needs when grabbing line, and described relay four all needs closed the connection; Survey outside needs carry out and grab line and carry out the low-frequency parameter test of outside line arrowband when grabbing line, described relay four fundamental rules need to disconnect.
Described testing digital user line also comprises with line grabbing device:
Relay seven is connected between the circuit and the circuit between relay two and test circuit between relay one and test circuit;
When needs are monitored when grabbing line:
Relay seven is connected, and relay four disconnects, and relay one and relay two switch to respectively with test circuit and be communicated with the position.
Described testing digital user line is with in the line grabbing device, if be connected with a plurality of digital subscriber test line grabbing devices in the described transmission line simultaneously, circuit between then described relay one and test circuit, and also need to be provided with relay five and relay six in the circuit between described relay two and test circuit, and relay five and relay six that in running order digital subscriber is tested with line grabbing device are in closed on-state.
Described testing digital user line is with in the line grabbing device, if be connected with a plurality of digital subscriber test line grabbing devices in the described transmission line simultaneously, then described low-pass filtering module, busy not busy detection module and relay three can be built in the test circuit.
As seen from the above technical solution provided by the invention, among the present invention, every port only needs to use less relay, cooperates test board, promptly can realize needed various test function project; And, because the relay that uses is less, the cost of product is reduced greatly; Simultaneously, the area that relay takies is very big, uses less relay, and the port density of DSLAM is also promoted.In addition, in the present invention, the relay that plays buffer action between plate build-in test bus and system testing bus can be isolated influencing each other between veneer, makes the veneer that is in test mode not be subjected to the influence of other normal operation veneers, has guaranteed reliably carrying out of test effectively.
Description of drawings
Fig. 1 is the model schematic diagram of xDSL system;
Fig. 2 is a testing digital user line line grabbing device schematic diagram in the prior art;
Fig. 3 is testing digital user line line grabbing device schematic diagram among the present invention.
Embodiment
Method of the present invention is that the Plain Old Telephone Service Signal Separation in the transmission line of DSLAM is come out; Then, the transmission line that will carry the circuit of Plain Old Telephone Service signal respectively and carry Plain Old Telephone Service signal and digital subscriber line signal according to the needs of test is connected in the test circuit.The present invention utilizes the characteristics of xDSL signal cleverly, adopt low pass filter to isolate broadband xDSL signal, having guaranteed does not influence normally carrying out of POTS business to the test of xDSL, making only uses a small amount of relay just can realize carrying out the needed various line needs of grabbing of testing digital user line, comprise: line is grabbed in inside and outside survey, line is grabbed in low-frequency parameter test in arrowband, monitoring grab that line, PSTN test are grabbed the line function and when PSTN initiates test to the bypass functionality of Splitter.
Based on method provided by the invention, the present invention also provides a kind of testing digital user line line grabbing device, and as shown in Figure 3, described device comprises:
Low-pass filtering module LPF: be connected in the transmission line of DSLAM, be used for the Plain Old Telephone Service Signal Separation of transmission line is come out, obtain only to have the circuit that carries the Plain Old Telephone Service signal, so that grasp the detection line that needs according to actual needs neatly, and the signal that carries in the circuit is tested.
Relay: be arranged at transmission line respectively, and only carry in the circuit of Plain Old Telephone Service signal, the signal line that the position of the switch State Control testing digital user line by each relay need grasp;
Described relay mainly contains three, relay one A is connected between local side transmission line and the test circuit, survey in being used to carry out and grab line, so that xTU-C is received in the test circuit, relay two B are connected in test circuit and terminal transmission circuit, be used to carry out outer the survey and grab line, so that xTU-R is received in the test circuit, relay three D are connected between line relay two B and the circuit between test circuit between relay one A and test circuit, and described low-pass filtering module is connected with relay three D, be used for when carrying out broadband test for the POTS service signal provides path, guarantee that POTS is not subjected to the influence of broadband test;
Described relay one A and relay two B are dpdt relay, between described relay one A and relay two B direct-connected path is set also, do not need to grab line when operation, promptly during operate as normal, the position of the switch of relay one A and relay two B is for connecting mutual direct-connected path.
Busy not busy detection module: be used for before the low frequency dc parameter of measurement circuit, whether there is transmission telephone service signal in the detection line, and the output testing result, so that test circuit carries out the monitoring and the test of Plain Old Telephone Service signal according to the busy-idle condition of circuit, realize meeting busy accident; Described busy not busy detection module and described low-pass filtering module can make up and be set to a module and be connected in the transmission line, also can independently separately be provided with to be connected in the transmission line; Promptly as shown in Figure 3, busy not busy testing circuit both can be cascaded with low-pass filtering module LPF, also can independently be cascaded with relay seven E.
In the device of the present invention, if be provided with the separator SPL that links to each other with PSTN (public switched telephone network (PSTN)) in the transmission line of described DSLAM, then this device also comprises relay four C, and described relay four is connected between described separator and the terminal transmission circuit.Certainly, if there is not the requirement of bypass separator SPL in the transmission line, then relay four C also can omit, because pull up time is several ms, and the hooking time of switch is hundreds of more than ms to a second, so the switching of relay four C should be unable to cause erroneous judgement to be hooking.
In the device of the present invention, realize that if desired monitoring function then also needs to be provided with relay seven E, when needs carry out that digital subscriber line signal and POTS service signal are monitored in the transmission line, this relay closes;
As shown in Figure 3, in the device of the present invention, relay one A, relay two B are dpdt relay, and wherein slightly black solid line is represented normally closed situation, and the state when also being operate as normal, fine dotted line are represented the Chang Kai situation; The normal operation that the normally off of each relay makes up the every business except that grabbing line that can guarantee when grabbing wire module because of certain reason outage like this; Relay four C, relay three D, relay seven E are the double-pole single-throw (D.P.S.T.) relay, and business disconnects when normally moving; Relay one A is that line relay is grabbed in interior survey, and relay two B are that outer the survey grabbed line relay, and relay four C are the bypass relay.
The front is illustrated the structure of device of the present invention, the course of work of device of the present invention is described below again.
Survey in needs carry out when grabbing line: described relay one need be switched to test circuit and be communicated with the position, described relay two remains on the terminal transmission circuit and is communicated with the position;
Referring to Fig. 3, grab line if survey in carrying out, actuating of relay order as be the closed POTS that connects of relay four C at first then, relay one A forwards normally opened contact to then, in xTU-C (xDSL local side unit) port is switched on the survey bus; Though SPL and PSTN also hang on the port,, add the low-pass effect of SPL, so PSTN can not exert an influence to test because interior survey is high-frequency signal certainly.
Survey is grabbed line and also can be surveyed realization when grabbing line outside in addition, sees also hereinafter outer the survey and grabs line.
Survey when grabbing line outside needs carry out: described relay three D connect, and relay one A and relay two B switch to respectively with test circuit and are communicated with the position;
Referring to Fig. 3, carry out the high-frequency signal test if grab outside line, actuating of relay order as be the closed connection of relay four C POTS at first then, relay one A, relay two B forward normally opened contact to then, circuit and xTU-R (xDSL far-end unit) are switched to outer the survey on the bus, the closed other path of connecting PSTN of relay three D, last relay four C disconnect again; Because relay three D have connected PSTN, so arrowband PSTN business is unaffected; And because the existence of the low-pass filtering module LPF of relay three D polyphone, though this moment, PSTN hung on the circuit, the outer high-frequency signal of surveying is not subjected to the influence of PSTN; Among the present invention, this design is particularly important for the test circuit that employing TDR (Time Domain Reflectometry) or FDR (frequency domain reflection) etc. are subject to the SPL influence, because LPF can be designed to present very high impedance for the above frequency band of POTS, and can its influence of calibration in advance to TDR and FDR, to guarantee the measuring accuracy of TDR and FDR.
When needs carry out outside line arrowband low-frequency parameter (being POTS service signal parameter) test grab line the time: relay one A and relay two B switch to respectively with test circuit and are communicated with the position, relay three D connection, simultaneously, described busy not busy detection module is started working;
If transmission line is carried out the test of arrowband low-frequency parameter, and such as direct voltage, resistance, electric current, electric capacity etc. are because can influence normally carrying out of PSTN business, so require at first detection line whether busy (be whether the PSTN service operation is arranged in the transmission line, as conversation etc.); Still,, need outside described carrying out, survey and grab on the basis of line, start described busy not busy detection module for realizing carrying out the line of grabbing of outside line arrowband low-frequency parameter test referring to Fig. 3; Described busy not busy detection module can for independently with the continue busy not busy detection module of polyphone of relay seven E, this moment relay seven E closures, relay three D disconnect; Described busy not busy detection module also can be the busy not busy detection module of connecting with low-pass filtering module, this moment relay three D closures, relay seven E disconnect; After starting, busy not busy detection module then carries out relevant detection, if line be busy, accident low-frequency parameter then, otherwise relay one A switches to normally opened contact, relay four C keep disconnecting, and relay two B remain on normally opened contact, thereby outer the survey on the bus received in outside line, just can carry out the test of low-frequency parameter this moment, and the test result of this moment is not subjected to the influence of DSLAM and PSTN fully.
When needs are monitored when grabbing line: relay seven E connect, and relay one A and relay two B switch to respectively with test circuit and are communicated with the position;
Specifically referring to shown in Figure 3, when monitoring when grabbing line, at first relay 3C closure is connected POTS, relay one A, relay two B all get to normally opened contact then, relay seven E closures are crossed the inside and outside bus of surveying with link tester and are connected, last relay 3C disconnects, like this, and the information such as frequency spectrum of test circuit on just can Monitoring Line.
When needs when PSTN (public switched telephone network (PSTN)) initiates test: then relay two B switch to test circuit and are communicated with the position, the closed connection of relay four C, the SPL module is not influenced test result by bypass.
Do not comprise the process that test bus discharges in the above embodiment introduction, in fact grab the release flow process that the line project is easy to just can infer its correspondence from each test.Described release flow process promptly is that each relay recovery is arrived normal operating conditions, and the busy not busy detection module of order quits work.
In the device of the present invention, because may a lot of again piece interface integrated circuit board Line card or separator board splitter card among the DSLAM, like this, the test bus of each piece plate all needs to hang on the test bus of whole system, form a lot of bridge joint heads (Bridge Tap), for fear of forming a lot of bridge joint heads, then need on line card or splitter card plate build-in test bus, add two relay five F, relay six G near the place that links to each other with test module bus (system testing bus); Described relay five F and relay six G are arranged at the circuit between described relay one A and test circuit, and in the circuit between described relay two B and test circuit, and the test of in running order digital subscriber is in closed on-state with relay five F and relay six G of line grabbing device, corresponding plate build-in test bus links to each other with system testing, and other plate build-in test buses are thrown off.And, at this moment, described low-pass filtering module LPF, busy not busy detection module and relay three D can be built in the test circuit, to further save relay like this, be that this situation need be equipped with the special-purpose test circuit that includes low-pass filtering module LPF, busy not busy detection module and relay three D.
The above; only for the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, and anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claims.
Claims (12)
1, a kind of line grabbing method for testing digital user line is characterized in that, comprising:
Plain Old Telephone Service Signal Separation in the transmission line of DSLAM (Digital Subscriber Line Access Multiplexer) is come out;
Needs according to test will only carry the Plain Old Telephone Service signal respectively, and the transmission line that carries digital subscriber line signal and Plain Old Telephone Service signal is connected in the test circuit.
2, a kind of testing digital user line line grabbing device of realizing based on said method is characterized in that, comprising:
Low-pass filtering module: be connected in the transmission line of DSLAM, be used for the Plain Old Telephone Service Signal Separation of transmission line is come out, obtain only to have the circuit that carries the Plain Old Telephone Service signal;
Relay: be arranged at transmission line respectively, and the circuit that carries the Plain Old Telephone Service signal is only arranged, the signal line that need grasp by the on off state control figure subscriber line test of each relay.
3, testing digital user line line grabbing device according to claim 2 is characterized in that, described device also comprises:
Busy not busy detection module: be used for the circuit that carries the Plain Old Telephone Service signal when grasping, and when this signal monitored or test, whether have the Plain Old Telephone Service signal that is transmitting in the detection line, and the output testing result.
4, testing digital user line line grabbing device according to claim 3, it is characterized in that, described busy not busy detection module and described low-pass filtering module can make up and be set to a module and be connected in the transmission line, also can independently separately be provided with to be connected in the transmission line.
5, according to claim 2,3 or 4 described testing digital user line line grabbing devices, it is characterized in that, described relay has three, relay one is connected between local side transmission line and the test circuit, relay two is connected in test circuit and terminal transmission circuit, relay three is connected between the circuit and the circuit between relay two and test circuit between relay one and test circuit, and described low-pass filtering module is connected with relay three.
6, testing digital user line line grabbing device according to claim 5 is characterized in that, described relay one and relay two are dpdt relay, and described relay one and two on relay are provided with direct-connected path.
7, testing digital user line line grabbing device according to claim 6 is characterized in that:
In needs carry out, survey when grabbing line:
Described relay one switched to test circuit be communicated with the position, described relay two remains on the terminal transmission circuit and is communicated with the position;
Outside needs carry out, survey when grabbing line:
Relay three is connected, and relay two switches to respectively with test circuit and is communicated with the position;
When needs carry out inside and outside survey and grab line:
Survey is grabbed line and is grabbed the line operation with outer the survey in carrying out simultaneously;
When needs carry out the test of outside line arrowband low-frequency parameter and grab line:
Relay one and relay two switch to respectively with test circuit and are communicated with the position, and relay three is connected, and simultaneously, described busy not busy detection module starts, if line be busy, accident low-frequency parameter then, otherwise, carry out the test of low-frequency parameter.
8, testing digital user line line grabbing device according to claim 5, it is characterized in that, if be provided with the separator that links to each other with PSTN (public switched telephone network (PSTN)) in the transmission line of described DSLAM, then this device also comprises relay four, and described relay four is connected between described separator and the terminal transmission circuit.
9, testing digital user line line grabbing device according to claim 8 is characterised in that altogether,
When needs carry out PSTN (public switched telephone network (PSTN)) test and grab line:
Relay two switches to test circuit and is communicated with the position, relay four closed connections;
And, in carrying out, survey by needs when grabbing line, and described relay four all needs closed the connection; Survey outside needs carry out and grab line and carry out the low-frequency parameter test of outside line arrowband when grabbing line, described relay four fundamental rules need to disconnect.
10, testing digital user line line grabbing device according to claim 5 is characterized in that, this device also comprises:
Relay seven is connected between the circuit and the circuit between relay two and test circuit between relay one and test circuit;
When needs are monitored when grabbing line:
Relay seven is connected, and relay four disconnects, and relay one and relay two switch to respectively with test circuit and be communicated with the position.
11, testing digital user line line grabbing device according to claim 5, it is characterized in that, if be connected with a plurality of digital subscriber test line grabbing devices in the described transmission line simultaneously, circuit between then described relay one and test circuit, and also need to be provided with relay five and relay six in the circuit between described relay two and test circuit, and relay five and relay six that in running order digital subscriber is tested with line grabbing device are in closed on-state.
12, testing digital user line line grabbing device according to claim 11, it is characterized in that, if be connected with a plurality of digital subscriber test line grabbing devices in the described transmission line simultaneously, then described low-pass filtering module, busy not busy detection module and relay three can be built in the test circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410071513 CN1719847A (en) | 2004-07-07 | 2004-07-07 | Line grabbing method for testing digital user line and its apparatus |
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| CN 200410071513 CN1719847A (en) | 2004-07-07 | 2004-07-07 | Line grabbing method for testing digital user line and its apparatus |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101042420B (en) * | 2007-04-24 | 2010-05-26 | 华为技术有限公司 | Method, system and device for line detection |
| CN101227518B (en) * | 2007-04-11 | 2011-02-16 | 河海大学常州校区 | ADSL/VDSL segregator multi module automatic detection system |
-
2004
- 2004-07-07 CN CN 200410071513 patent/CN1719847A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101227518B (en) * | 2007-04-11 | 2011-02-16 | 河海大学常州校区 | ADSL/VDSL segregator multi module automatic detection system |
| CN101042420B (en) * | 2007-04-24 | 2010-05-26 | 华为技术有限公司 | Method, system and device for line detection |
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Open date: 20060111 |