CN1571521A - A testing system of digital subscriber line and testing method - Google Patents

Abstract

The invention discloses a test system and a test method for a digital subscriber line, wherein the test system includes: a line grabbing matrix device and a test module, and the line grabbing matrix device is connected between a distribution frame and a local end broadband device for grabbing The specified subscriber lines are tested by the test module, which is built into the broadband equipment at the central office and connected with the main control module of the broadband equipment at the central office and the line grabbing matrix equipment through an interface. The invention greatly simplifies the test system and reduces the complexity and cost of the test by building the test module in the central office broadband equipment.

Description

A test system and test method for a digital subscriber line

technical field

The invention relates to broadband service testing technology, in particular to a digital subscriber line testing system and testing method.

Background technique

In the field of telecommunication services, operators provide users with broadband telecommunication services and narrowband telecommunication services at the same time through a pair of twisted pairs, such as adding ADSL (ADSL over POTS) to ordinary phones, adding ADSL (ADSL over ISDN) to ISDN, and adding ADSL (ADSL over ISDN) to ordinary phones. Increase VDSL (VDSL over POTS), ISDN increases services such as VDSL (VDSL over ISDN), the application of this class is quite general (in the present invention, ADSL, VDSL are collectively referred to as xDSL, i.e. X digital subscriber line).

As shown in Figure 1, xDSL signals and POTS/ISDN signals coexist in a user's outside line. Send it to the broadband service board (xDSL service board) and narrowband service board (POTS/ISDN service board) for processing, and on the user side, the splitter (SPL) sends the separated broadband and narrowband services to the remote user unit ( RTU) and phone.

During the operation and maintenance of such services, for example, when users report faults, it is often necessary to measure user line parameters (such as: line voltage parameters, line resistance parameters, line capacitance parameters, line background noise, line-to-ground balance, etc.) . Based on these parameter data, the quality and fault conditions of the line can be judged, and what kind of labor is needed to repair the fault can be determined. However, the digital subscriber line access multiplexer (DSLAM, also known as central office broadband equipment) manufactured in the early stage does not support the line capture function (capture the subscriber line to internal or external test equipment), so these DSLAM equipment cannot support automatic line testing . How to solve this problem and design a good automatic line measurement system will greatly affect the operator's operation and maintenance costs and service quality.

At present, there are mainly two technical solutions for user line testing:

Technical solution one:

As shown in Figure 2, a test device is inserted between the original distribution frame (MDF) and the DSLAM equipment at the central office. The test equipment is composed of two parts: the line grab matrix module and the test module. The line grab matrix module grabs a specified user line and sends it to the test module. The test module performs the line resistance, capacitance, voltage test, line background noise, vertical balance, etc. Line parameter test. However, this scheme has the following disadvantages:

(1) The test equipment needs to complete functions such as power acquisition, communication with DSLAM, line capture/line release, line test, etc. The test equipment is relatively complicated;

(2) The test equipment includes a large number of ports (each user occupies a pair of ports). Therefore, the test equipment is bulky and expensive, and the cost per user is relatively high.

Technical solution two:

As shown in Figure 3, a line grabbing matrix device is inserted between the original distribution frame (MDF) and the local end DSLAM equipment, and a test instrument (or test equipment) is configured outside the line grabbing matrix device. The line grabbing matrix device captures a specified user line to the test equipment, and the test equipment performs line resistance, capacitance, and voltage tests, as well as line parameter tests such as line background noise and longitudinal balance. This kind of scheme also has the following deficiencies:

(1) Line grasping matrix equipment and test equipment need power supply respectively; line grasping equipment and test equipment need to communicate with DSLAM respectively. The complexity of the whole system is further increased;

(2) The number of ports included in the wire grabbing device is huge (each user occupies a pair of ports), therefore, the test device is bulky and expensive. In addition, special test equipment (test instrument) is required, and special test equipment is generally expensive, so the cost per user is high.

Contents of the invention

The object of the present invention is to provide a test system and test method for digital subscriber lines, so as to solve the problems of complex test system and high cost in the prior art.

A test system for digital subscriber lines, including a line grabbing matrix device and a test module, the line grabbing matrix device is connected between the distribution frame and the broadband equipment at the local end, and is used to grab a designated subscriber line and test it for the test module. The test module is built into the broadband equipment at the central office, and is connected with the main control module of the broadband equipment at the central office and the line grabbing matrix equipment through an interface.

According to the above test system:

The interface between the test module and the wire-grabbing matrix equipment includes:

Communication interface, through which the central office broadband equipment communicates with the line grabbing matrix equipment;

Power supply interface, through which the central office broadband equipment provides power to the line grabbing matrix equipment;

The test bus interface, through which the test module tests the user's outside lines captured by the line capture matrix device.

The test module is connected to the main control module through a connector, and the three-way signals of the communication interface, the power supply interface and the test bus interface are combined on the connector on the side of the main control module.

A method for testing a digital subscriber line, wherein a line-grabbing matrix device between a distribution frame and a central broadband device grabs a specified subscriber line to a test module for testing, and the method includes steps:

The main control module of the broadband equipment at the central office initiates a test command;

The test module notifies the action of the wire grabbing matrix device through the interface;

The line grabbing matrix device grabs the specified user's outside line to the test bus;

The line test module tests the user's outside line through the test bus, and reports the test result to the main control module.

According to the above test method:

The test result is reported to the main control module, and the main control module processes it.

The test results are reported to the centralized maintenance system through the main control module, and processed by the system.

The power supply of the line grabbing matrix device is provided by the central office broadband device.

On the side of the main control module, the communication, power supply and test signals of the test module side are combined on one physical connector.

The present invention has the following beneficial effects:

(1) The central office broadband equipment simplifies the complexity of the test system through the built-in test module;

(2) The broadband equipment at the central office provides power supply and communication interface for the line grabbing matrix in the computer room, which simplifies the complexity of the line grabbing matrix equipment;

(3) The test data can be processed by the DSLM network management or reported to the 112 centralized maintenance desk for processing;

(4) The present invention achieves both cost and function.

Description of drawings

FIG. 1 is a network diagram for simultaneously providing broadband services and narrowband services to users in the prior art;

Fig. 2 is a schematic diagram of testing a pair of subscriber lines in Fig. 1 in the prior art;

Fig. 3 is a schematic diagram of testing the subscriber line in Fig. 1 in the second prior art;

Fig. 4 is the principle diagram that the present invention tests subscriber line;

Fig. 5 is a structural diagram of a connector used in the present invention;

Figure 6 is a test flow chart.

Detailed ways

Referring to Fig. 4, the test system of the present invention includes a wire grabbing matrix device and a test module. The wire grabbing matrix device is connected between the distribution frame and the broadband equipment at the central office, and is used to grab specified subscriber lines and send them to the test module for testing. The test module is set in the broadband equipment at the local end, and the test module is connected with the line grabbing matrix device through the communication interface, the power supply interface and the test bus interface, and the line grabbing matrix device is connected with the main control module of the broadband equipment at the central office through the interface.

The broadband device at the local end provides power to the line grab matrix device through the power supply interface, so as to reduce the cost and complexity of the line grab matrix device.

The broadband device at the central office communicates with the line grabbing matrix through the communication interface to control the line grabbing matrix to grab a certain line and test it with the built-in line test module. The communication interface can use RS232 or RS485/422 and so on.

The broadband equipment at the central office obtains a certain line captured by the line capture matrix through the test bus, and then tests the outdoor line of this line.

As shown in Figure 5, the test module and the main control module are connected by a DB15 connector. On the side of the main control module, the three groups of signals of the power supply interface, communication interface and test bus interface are combined on the physical connector. The signal arrangement is shown in the table below: foot Signal foot Signal 1 RAU_RX-, RS485 differential serial port receiving- 2 +15V, DSLAM is positive for the 15V power supply of the wire grabbing matrix equipment 3 +15V, DSLAM is positive for the 15V power supply of the wire grabbing matrix equipment 4 GND, DSLAM is negative for the 15V power supply of the wire grabbing matrix device 5 TA, user test bus TIP 6 RAU_RX+, RS485 differential serial port receiving+ 7 RAU_TX-, RS485 differential serial port transmission- 8 +15V, DSLAM is positive for the 15V power supply of the wire grabbing matrix equipment 9 GND, DSLAM is negative for the 15V power supply of the wire grabbing matrix device 10 GND 11 RAU_TX+, RS485 differential serial port transmission+ 12 +15V, DSLAM is positive for the 15V power supply of the wire grabbing matrix equipment 13 GND, DSLAM is negative for the 15V power supply of the wire grabbing matrix device 14 GND, DSLAM is negative for the 15V power supply of the wire grabbing matrix device 15 TB, user test bus RING

Referring to Figure 6, the specific test process is as follows:

Step 10: The main control module of the broadband device at the central office initiates a test command.

The test command includes parameters such as which subscriber line to test and what kind of test to perform on the subscriber line. Such as DMM test or line length test.

Step 20: After the line test module receives the test command from the main control module, it forwards the command through the communication interface between the line test module and the line grabbing matrix device, and notifies the line grabbing matrix device to act;

Step 30: The line grabbing matrix device grabs the specified user's outside line, and makes this specified outside line physically short-circuited to the test bus.

After the line grabbing matrix device has finished grabbing the user's outside lines, it will report the completion of line grabbing to the line test module through the communication interface.

Step 40: The line test module starts to test the subscriber line through the bus. The signal processing of the subscriber line by the test module is the same as that of the prior art.

Step 50: After the line test module finishes testing the user line, it reports the result to the main control module for processing.

According to the test requirements, the main control module may also report the test results to the 112 centralized maintenance system for processing.

The line test module generally includes the following functions:

Digital multimeter (DMM) test: line DC voltage, AC voltage, line resistance, line capacitance test;

Frequency response (FR) and line openable rate test: for the frequency range of ADSL, the frequency response of the line can be measured; the line openable rate can be estimated;

Line background noise test: It can identify the noise type of the line, such as E1 type crosstalk noise or ADSL type crosstalk noise, etc.;

Load Coil Test: It can detect the number of inductances connected in series in the line and determine the position of the first series inductance;

Longitudinal balance test: can measure the longitudinal balance of the line;

Line length test: can measure line length;

Impulse noise test: Impulse noise in the line can be detected.

Claims (9)

1, a kind of test macro of digital subscriber line, comprise line capture module equipment and test module, this line capture module equipment is connected between distributing frame and local side broadband device, the subscriber's line that is used to grasp appointment is tested to test module, it is characterized in that, described test module is built in the described local side broadband device, and is connected with described line capture module equipment with the main control module of local side broadband device by interface.

2, test macro as claimed in claim 1 is characterized in that, the interface between described test module and the line capture module equipment comprises:

Communication interface, the local side broadband device is by this interface and line capture module device talk;

Power supply interface, the local side broadband device provides power supply by this interface to line capture module equipment;

The test bus interface, test module is tested the user outline that line capture module equipment grasps by this interface.

3, test macro as claimed in claim 1 or 2, it is characterized in that, be connected by connector between described test module and the described main control module, be incorporated on this connector at three road signals of main control module side with communication interface, power supply interface and test bus interface.

4, a kind of method of testing of digital subscriber line is grasped the subscriber's line of appointment and tests to test module by the line capture module equipment between distributing frame and local side broadband device, the method comprising the steps of:

The main control module of local side broadband device is initiated test command;

Test module is by the action of interface notice line capture module equipment;

Line capture module equipment grasps the user outline of appointment to test bus;

Line test module tests and obtains test result by test bus to user outline.

5, method of testing as claimed in claim 4 is characterized in that, described test result is reported main control module, is handled by main control module.

6, require 4 described method of testings as the right profit, it is characterized in that, described test result reports Centralized Maintenance System For by main control module, is handled by this system.

7, method of testing as claimed in claim 4 is characterized in that, the power supply of described line capture module equipment is provided by the local side broadband device.

8, method of testing as claimed in claim 7 is characterized in that, is incorporated on the physical connector in communication, power supply and the test signal of main control module side with the test module side.

9, as the arbitrary described method of testing of claim 4 to 8, it is characterized in that the test item of test module comprises:

Digital multimeter (DMM) test, frequency response (FR) and circuit can be opened rate test, the test of circuit background noise, circuit loading coil (Load Coil) test, longitudinal balance degree test, line length test and impulsive noise test.

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