CN100391179C - Network line error detection system and method - Google Patents

Abstract

The present invention relates to a detecting system and a detecting method for error codes on the lines of a network. The detecting system of the present invention comprises a testing code stream generating and sending assembly, a code stream receiving and synchronizing assembly, an error code rate statistic assembly and an interface assembly, wherein the testing code stream generating and sending assembly is used for generating and continuously sending the original testing code stream for detecting the error codes; the receiving and the synchronization treatment of the testing code stream is completed by the testing code stream receiving and synchronizing assembly, and a correct starting position of the data in the testing code stream is found. The error code rate statistic assembly is used for comparing the synchronous testing code stream received by the testing code stream receiving and synchronizing assembly with the original testing code stream generated by the testing code stream generating and sending assembly, and the number of error bits is counted and the error code rate of the lines of the network is calculated; the interface assembly is used for sending the data on the lines of the network to the testing code stream receiving and synchronizing assembly, and sending the data generated by the testing code stream generating and sending assembly to the lines of the network simultaneously. The assemblies are arranged on network devices on the end nodes of the lines of the detected network for the detection; correspondingly, the present invention also comprises the method for detecting the error codes on the lines of the network.

Description

Network line error detection system and method

technical field

The invention relates to the technical field of communication networks, in particular to a network line error code detection system and method of an integrated service digital network (ISDN).

Background technique

ISDN (Integrated Services Digital Network) evolved from Integrated Digital Network (IDN, Integrated Digital Network) and provides two user interfaces: Basic Rate Interface (BRI, BasicRate Interface) and Primary Rate Interface (PRI, Primary Rate Interface).

At present, the domestic ISDN network lines are generally in the 2B+D mode, that is, two basic digital channels (B channels), and one control digital channel (D channel). That is to say, BRI-ISDN provides two B channels and one D channel on a twisted pair. The B channel is used to transmit voice, data, etc., and the bandwidth of each B channel is 64Kbps. The D channel is used to transmit instructions, and the bandwidth of each D channel is 16Kbps. Therefore, a 2B+D connection can provide a transmission rate of up to 144Kbps, of which the pure data rate can reach 128Kbps. The main rate interface PRI (30B+D) has a rate of 2.048Mbps, of which the pure data rate can reach 1920Kbps, so it is generally used for applications that need to transmit a large amount of data.

BRI uses Digital Subscribe Line (DSL, Digital Subscribe Line) technology to implement digital access to subscriber lines, and PRI uses Pulse Code Modulation (PCM, Pulse Code Modulation) to access. In this way, ISDN provides an end-to-end digital connection, so a single network can be used to transmit various information and realize the integrated access of all services, which can be traditional voice services, data services, and video and audio services. Multimedia services within the network, etc.

Conference TV provides a virtual "face-to-face" communication method, using the existing network to transmit video/audio and data information to achieve real-time interactive process. ISDN has become one of the most widely used network line interfaces due to its high transmission rate (BRI interface provides 128Kbps data channel, PRI interface provides 1920Kbps data channel), convenient access, and wide coverage area. Polycom, Tandberg, Vcon, PictureTel Well-known manufacturers of video conference equipment such as China Telecom provide video conference equipment that supports ISDN network line interfaces.

Most of the ISDN network is built on the previous IDN network. In many places, the quality of network line transmission cannot meet the higher transmission requirements of video and audio data transmission of conference TV equipment. When using it, it is often necessary to check the network line error status. At the same time, when some problems occur, such as: poor sound and image quality, etc., it is necessary to detect the error status of the network line to help locate and solve the problem.

However, at present, the conference TV equipment with ISDN interface does not have the ability to detect network line errors, and the detection of network line errors can only be completed with the help of other professional testing instruments: such as SUNSET, COBRA, etc. support ISDN network line error detection function tester. Such testers, as professional test equipment, exist independently of network equipment and are relatively expensive. At the same time, it is difficult for non-professional general users to operate and use, and general users do not need or have such equipment, which brings inconvenience to the maintenance and problem location of conference TV equipment with ISDN network line interface.

Contents of the invention

The problem to be solved by the present invention is to provide a network line error code detection system and method, so that end-to-end network line error code detection can be completed between network nodes without using professional testing instruments.

In order to solve the above problems, the network line error detection system of the present invention includes:

Test code stream generation and sending component, used for the generation and continuous transmission of the original test code stream for bit error testing;

The test code stream receiving and synchronization component completes the receiving and synchronization processing of the test code stream, finds the correct starting position of the data in the test code stream, and ensures that the received data is aligned with the data sent by the peer;

The bit error rate statistical component compares the synchronous test bit stream received from the test bit stream receiving and synchronizing component with the original test bit stream generated by the test bit stream generating and sending component, and counts the number of erroneous bits and calculates the network line bit error rate;

The interface component sends the data on the network line to the test code stream receiving and synchronizing component, and at the same time sends the data generated by the test code stream generating and sending component to the network line.

Each component is configured to detect on the end node network device of the detected network line.

Correspondingly, the network line error code detection method of the present invention performs the following steps on the detected network line end node device:

1) Determine the bit error detection mode, test code group or code stream generation rules;

2) The end node of the detected network line establishes a B channel connection through a network call;

3) The data sending end forms the original test code stream by repeating the test code group or generates the original test code stream according to the rules and sends it continuously;

4) The data receiving end performs a synchronous search of the test code stream;

5) The data receiving end compares the value of the received test code stream and the original test code stream, counts the number of different bits, and calculates the bit error rate.

The error detection modes include:

In the detected network line, an end node network device is equipped with at least a test bit stream generation and sending component and an interface component, and an end node network device is equipped with a test bit stream receiving and synchronization component, a bit error rate statistics component and an interface at least component to detect a bit error condition in the receiving direction of a B channel in the network line; or

An end node network device is equipped with a test code stream generation and sending component, a test code stream receiving and synchronization component, a bit error rate statistics component and an interface component, while the opposite end node network device has data loopback capability to detect Aggregate bit error conditions in transmit and receive directions for a B-channel; or

An end node network device is equipped with a test bit stream generation and sending component, a test bit stream receiving and synchronizing component, a bit error rate statistics component and an interface component, while the opposite end node network device is a switch, which is used to detect a B channel sending and another One B channel receives the total error status in both directions.

Compared with the prior art, the present invention has the following advantages:

1. Because the network line error detection system of the present invention is set on the network equipment, it is convenient to maintain network equipment and network lines;

2. Provide ISDN network line detection capability comparable to that of professional testers;

3. Because ordinary users do not need to use professional testing equipment, it brings convenience in operation.

Description of drawings

FIG. 1 is a schematic diagram of a network line error detection system of the present invention.

2 and 3 are schematic diagrams of test networking of the network line error detection system of the present invention.

4-6 are schematic diagrams of detection modes of the network line error detection system and method of the present invention.

7 and 8 are flow charts of the network line error detection method of the present invention.

Detailed ways

Please refer to Fig. 1, the network line error detection system of the present invention is used in the integrated service digital network in this embodiment, including:

Test code stream generation and sending component 1, used for the generation and continuous transmission of the original test code stream for bit error testing;

The test code stream receiving and synchronization component 2 completes receiving the test code stream and synchronizing processing, and finds the correct starting position of the data in the test code stream, so as to ensure that the received data is the data sent by the peer end, no more and no less. ahead and not behind;

Bit error rate statistical component 3 compares the synchronous test code stream received from the test code stream receiving and synchronous component 2 with the original test code stream generated by the test code stream generation and sending component 1, and counts the number of erroneous bits and Calculate the bit error rate of the network line;

The interface component 4 sends the data on the network line to the test code stream receiving and synchronizing component 2, and at the same time sends the data generated by the test code stream generating and sending component 1 to the network line.

Each of the above-mentioned components is configured on an end node network device of a network line to be detected for detection.

The original test code stream is composed of repeated occurrences of fixed test code groups or generated according to certain generation rules, such as repeatedly generating 0xABCDABCD... from code group 0xABCD (hexadecimal notation), or as Euler sequence, by a certain Sequences generated by polynomials, etc. Regardless of the method, the test code stream receiving and synchronizing component 2 must know and support the test code group or generation rule, so as to generate the same code stream as the sending end for comparison.

The process of bit error testing is: the sending end sends a continuous code stream composed of repeated occurrences of a fixed test code group or a continuous code stream that meets a certain generation rule. After receiving the test code stream, the receiving end compares it with the original test code stream generated by the sending end Compare the code streams with the same stream, and count the number of different bits (caused by network line errors, if there is no network line error, they should all be the same), then the bit error rate can be calculated.

The bit error rate statistical component 3 calculates the bit error rate of the network line according to the following formula:

Cumulative bit error rate = total number of errored bits / total number of received bits

Burst bit error rate = the total number of error bits within a certain period of time / the total number of received bits within this period of time.

The bit error detection in the network line of the ISDN requires end-to-end cooperation, where one end node is the sending end and the opposite end node is the receiving end. Sometimes the same end node is both a sender and a receiver.

Please refer to FIG. 2 and FIG. 3 , in this embodiment, the video conferencing device 21 is used as the network device at the sending end, and the video conferencing device has an ISDN interface. When performing a bit error test, in addition to the network equipment at the sending end and the receiving end, other network equipment (ISDN switch 22, ISDN tester 24, etc.) are required to cooperate with each other.

The network line error detection system (method) of the present invention is configured (detected) according to the following detection modes:

1. In the network line that needs to be detected, an end node network device is equipped with a test code stream generation and sending component 1, a test code stream receiving and synchronization component 2, a bit error rate statistics component 3 and an interface component 4, and the opposite node The network equipment is an integrated service digital network switch 22, which is used to detect the total bit error conditions in two directions of one B-channel sending and the other B-channel receiving.

2. In the network line that needs to be detected, one end node network device is equipped with at least test code stream generation and transmission component 1 and interface component 4, and the opposite end node network device is equipped with at least test code stream reception and synchronization component 2, error The code rate statistical component 3 and the interface component 4 are used to detect the bit error condition in the receiving direction of a B channel in the network line.

3. In the network line that needs to be detected, an end node network device is equipped with a test code stream generation and sending component 1, a test code stream receiving and synchronization component 2, a bit error rate statistics component 3 and an interface component 4, and the opposite node The network equipment has the data loopback capability to detect the total bit error condition in the sending and receiving direction of a B channel in the network line.

Please combine Fig. 2 and Fig. 4 (case 3) to show, the specific configuration of the detection system of the first detection mode: the video conferencing equipment 21 is equipped with a test code stream generating and sending component 1, a test code stream receiving and synchronizing component 2, an error Code rate statistics component 3 and interface component 4, and the peer node network device is ISDN switch 22, which is used to detect the total bit error situation in two directions of one B channel sending and another B channel receiving. In this detection mode, the video conferencing device 21 is both the sending end and the receiving end, which is equivalent to calling the video conference device 21 itself to establish a network line through the ISDN switch 22 through the ISDN subscriber line, so the ISDN switch 22 does not need special configuration.

In the detection system of the second detection mode, the video conference device 21 establishes a call network line through the ISDN switching network through the ISDN subscriber line. There are many kinds of specific configurations of the network devices, which are described below with examples.

Please combine with Fig. 3 and Fig. 4 (case 1) to show that the video conference equipment 21 is both a sending end and a receiving end, and is equipped with a test code stream generating and sending component 1, a test code stream receiving and synchronizing component 2, and a bit error rate statistics component 3 and interface component 4, the peer network device supports data loopback capability, receives data from the B channel, and at the same time sends the received data to the B channel intact, and can detect the sending and receiving direction of the B channel overall error status. It can also be considered that if a network device at one end supports the data loopback capability, then all four components of the network device at the other end need to be configured.

Please refer to Fig. 3 and Fig. 4 (case 2), as shown in Fig. 3 and Fig. 4 (case 2), the video conferencing equipment 21 is both a sending end and a receiving end, and is equipped with a test code stream generating and sending component 1, a test code stream receiving and synchronizing component 2, and a bit error rate statistics component 3 and interface component 4, the peer network device can only be configured with the test code stream receiving and synchronization component 2, the bit error rate statistics component 3 and the interface component 4 to detect the bit error status in the receiving direction of the B channel. Certainly, it is also acceptable if the peer network device is further configured with the test bit stream generating and sending component 1 .

Please refer to Figures 5 and 6, if one end of the network device is only equipped with test bit stream receiving and synchronization component 2, bit error rate statistics component 3 and interface component 4, the opposite end network device is equipped with at least test bit stream generation and sending components 1 and the interface component 4 to detect the bit error condition in the receiving direction of the B channel. Similarly, if one end of the network device is only equipped with a test code stream generation and sending component 1 and an interface component 4, then the peer network device is at least equipped with a test code stream receiving and synchronization component 2, a bit error rate statistics component 3 and an interface component 4, Or it has the ability to support data loopback to detect bit errors in the receiving direction of the B channel.

Please refer to FIGS. 7 and 8 for details. Correspondingly, the network line error detection method generally includes the following steps:

1) Determine the required error detection mode and test code group or generation rule of the integrated service digital network;

2) The end node of the network line to be detected establishes a B-channel connection through an ISDN call, see steps 801 and 901;

3) The data sending end generates the original test code stream and sends it continuously by repeating the test code group or generating the original test code stream according to the rules, see step 802;

4) The data receiving end performs a synchronous search of the test code stream, and this step further includes: performing step 902, receiving B channel data;

Execute step 903, judge whether data is synchronous (synchronous judgment is prior art, do not repeat), if not synchronous, then perform step 904, carry out synchronous search until synchronous back to step 902;

If it is synchronous, calculate the bit error rate;

5) The data receiving end compares the value of the received test code stream and the original test code stream, counts the number of bits that are not the same, and calculates the bit error rate. This step further includes

Execute step 905 to calculate the cumulative bit error rate;

Execute step 906 to determine whether the time interval of a certain time period has arrived, and if the time interval has arrived, then perform step 907 to calculate the burst bit error rate, and the time interval can be set repeatedly to calculate the burst bit error rate in different time periods ; If the time interval is not up, go to step 902.

In summary, the network line error code detection system and method of the present invention provide an ISDN network line error code detection method with the same function and comparable accuracy as a professional tester in a network device (such as a video conference device) with an ISDN network line interface. The user does not need to use other testers, as long as the relevant parameters are set in the network equipment of the end node of the network line to be tested, the error detection of the ISDN network line can be completed conveniently and accurately, so as to facilitate maintenance work and network line The location of the problem is solved.

Claims (9)

1. A network line error detection system, characterized in that the error detection system comprises: Test code stream generation and sending component, used for the generation and continuous transmission of the original test code stream for bit error testing; The test code stream receiving and synchronization component completes the receiving and synchronization processing of the test code stream, finds the correct starting position of the data in the test code stream, and ensures that the received data is aligned with the data sent by the peer; The bit error rate statistical component compares the synchronous test bit stream received from the test bit stream receiving and synchronizing component with the original test bit stream generated by the test bit stream generating and sending component, and counts the number of erroneous bits and calculates the network line bit error rate; The interface component sends the data on the network line to the test stream receiving and synchronizing component, and at the same time sends the data generated by the test stream generating and sending component to the network line; Each component is configured to detect on the end node network device of the detected network line. 2. The network line error code detection system as claimed in claim 1, characterized in that, each component of the detection system is configured on the end node network equipment of the network line according to the following modes: In the network line to be detected, an end node network device is at least equipped with a test bit stream generation and sending component and an interface component, while the opposite end node network device is equipped with at least a test bit stream receiving and synchronization component, and a bit error rate statistics component and an interface component to detect a bit error condition in the receiving direction of a B channel in the network line. 3. The network line error code detection system as claimed in claim 1, characterized in that, each component of the detection system is configured on the end node network equipment of the network line according to the following modes: In the network line to be tested, an end node network device is equipped with a test stream generation and sending component, a test stream receiving and synchronization component, a bit error rate statistics component and an interface component, while the opposite end node network device has a data loopback Ability to detect the overall bit error condition in the transmit and receive directions of a B channel in the network line. 4. The network line error code detection system as claimed in claim 1, characterized in that, each component of the detection system is configured on the end node network equipment of the network line according to the following modes: In the network line to be tested, an end-node network device is equipped with a test bit stream generation and sending component, a test bit stream receiving and synchronization component, a bit error rate statistics component, and an interface component, while the opposite end-node network device is a switch. To detect the total bit error condition in both directions of one B-channel sending and another B-channel receiving. 5. The network line error code detection system according to any one of claims 1 to 4, wherein the code error rate is: cumulative bit error rate, the ratio of the total number of errored bits to the total number of received bits; or Burst error rate, the ratio of the total number of errored bits in a certain period of time to the total number of received bits in that period of time. 6. The network line error detection system according to claim 5, wherein the test code stream generated by the test code stream generating and sending component is composed of a fixed test code group or generated according to a predetermined generation rule. 7. A network line error code detection method is characterized in that the method performs the following steps on the detected network line end node equipment: 1) Determine the bit error detection mode, test code group or code stream generation rules; 2) The detected network line end node establishes a B channel connection through a network call; 3) The data sending end generates the original test code stream by repeating the test code group or generates the original test code stream according to the predetermined generation rule and sends it continuously; 4) The data receiving end performs a synchronous search of the test code stream; 5) The data receiving end compares the value of the received test code stream and the original test code stream, counts the number of different bits, and calculates the bit error rate. 8. the network line error code detection method as claimed in claim 7, is characterized in that, in the detected network line, the code error detection mode in step 1) is: In the detected network line, an end node network device is equipped with at least a test bit stream generation and sending component and an interface component, and an end node network device is equipped with a test bit stream receiving and synchronization component, a bit error rate statistics component and an interface at least component to detect a bit error condition in the receiving direction of a B channel in the network line; or An end node network device is equipped with a test code stream generation and sending component, a test code stream receiving and synchronization component, a bit error rate statistics component and an interface component, while the opposite end node network device has data loopback capability to detect Aggregate bit error conditions in transmit and receive directions for a B-channel; or An end node network device is equipped with a test bit stream generation and sending component, a test bit stream receiving and synchronizing component, a bit error rate statistics component and an interface component, while the opposite end node network device is a switch, which is used to detect a B channel sending and another One B channel receives the total error status in both directions. 9. the network line error detection method as claimed in claim 7, it is characterized in that, in step 5), bit error rate is divided into accumulative bit error rate and burst bit error rate, and described accumulative bit error rate refers to total erroneous bit sum The ratio of the target to the total number of received bits, and the burst error rate refers to the ratio of the total number of errored bits to the total number of received bits within a certain period of time.

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