CN110572295A - A test method for verifying SSM response rules - Google Patents

Abstract

The present application provides a test method for verifying the SSM response rules, the method comprising: the test device sends a synchronous Ethernet signal through the first port; when the device under test receives the synchronous Ethernet signal sent by the test device through the fourth port, press the configured The SSM response rule sends the corresponding synchronous Ethernet signal to the test equipment through the fourth port and the fifth port, and sends the corresponding framed 2Mb/s external timing signal to the test equipment through the sixth port; the test equipment receives the synchronization sent by the device under test When the Ethernet signal and the framing 2Mb/s external timing signal are used, determine whether the received SSM value is the same as the configured SSM value; and record the comparison result; when the test equipment determines that any of the recorded comparison results are different, determine the tested The SSM response rule of the device is incorrect, and the SSM value corresponding to the records with different comparison results is displayed. This method can improve testing efficiency and reduce human errors.

Description

A test method for verifying SSM response rules

technical field

The invention relates to the technical field of communications, in particular to a test method for verifying SSM response rules.

Background technique

A Synchronous Status Message (SSM) is a code used by a synchronization network to indicate a clock quality level. At present, ITU-T stipulates that four bits are used for encoding, and these four bits are Synchronization Status Message Byte (SSMB).

As shown in Table 1, the SSM codes and their usage priorities defined by the ITU-T applicable to my country are used to distinguish information of different clock quality levels.

Table 1

In BITS equipment, SSM is transmitted through a certain bit of the first time slot (TS0) of the 2Mb/s clock signal; in SDH transmission network, SSM is transmitted through the lower four bits of the S1 byte in the SDH section overhead In synchronous Ethernet, the SSM is transmitted through a special slow protocol message (Ethernet Synchronization Messaging Channel, ESMC) message. The transmission device will determine the clock distribution and tracking path according to the SSM information it receives at different clock ports and the port's preset priority, and prevent the occurrence of timing loops.

YD/T 2551-2013 "Technical Requirements for Frequency Synchronization Networks Based on Packet Networks" has two requirements for the SSM support capability of transmission equipment: clock source optimization order and response rules.

There are two specific requirements in terms of clock source preference order:

(1), in the priority order of the timing reference signal, no matter what the priority of the clock receiving port of the transmission device is preset, the timing signal with a high SSM quality level is preferred, and its order is as shown in Table 1;

(2) When different reference source signals have the same SSM quality level, select the timing signal received at the clock port with a preset high priority.

In terms of SSM response rules, YD/T 2551-2013 has 5 specific regulations on transmission equipment:

(1) Rules for forwarding SSM quality level in hold state

In the event that the SEC/EEC loses the input timing reference signal and no other timing reference signal is available, the SEC/EEC will enter the hold state, synchronous Ethernet lines or STM-N lines/branches and external timing output signals in all directions (except direct derived ones) ) shall send SSM information at SEC/EEC clock level.

(2) Rules for forwarding SSM in non-switching state

When the SSM quality level of the timing reference signal selected by SEC/EEC changes and does not cause reference switching, synchronous Ethernet lines or STM-N lines/branches in all directions (except for reverse sending DNU) and external timing output signals (Except for direct export) The changed SSM quality level information should be sent.

(3) Rules for forwarding SSM in switching state

When a new timing reference signal is selected by SEC/EEC, synchronous Ethernet lines or STM-N lines/branches in all directions (except those transmitting DNU in the reverse direction) and external timing output signals (except those directly derived) shall transmit the newly selected The SSM quality level information of the timing reference signal.

(4) Rules for sending DNU in reverse

When SEC/EEC selects a synchronous Ethernet line or STM-N line/branch as the timing reference signal, the corresponding reverse synchronous Ethernet line or STM-N line/branch signal should send the SSM quality level information of QL_DNU .

When the external timing output signal is selected to be derived from the STM-N line/branch and the SEC/EEC selects the external timing input signal as the timing reference signal, and the SSM quality level of the two is the same, the corresponding reverse STM-N line/branch The tributary signal shall transmit the SSM quality level information of QL_DNU.

(5) Rules for direct derivation of external timing output signals

When the external timing output signal is selected to be derived from a synchronous Ethernet line or STM-N line/branch, the SSM quality level information of the selected synchronous Ethernet line or STM-N line/branch signal should be sent; when the selected synchronous Ethernet When the SSM quality level of network line or STM-N line/branch signal is lower than the set threshold value or LOS/AIS/OOF (LOF) alarm occurs, for 2Mb/s interface, it shall have the ability to insert AIS into the external timing output signal Information or blocking function; for 2MHz interface, it should have the function of blocking external timing output signal.

YD/T 2551-2013 "Technical Requirements for Frequency Synchronization Networks Based on Packet Networks" only puts forward the requirements of clock source optimization sequence and response rules for the SSM support capability of transmission equipment, does not specify test methods, and currently there are no other standards for This is standardized.

Generally, in the actual test, the testers will manually set external clocks with different priorities or SSM levels to the transmission equipment according to their personal understanding, and check the priority order of the clock sources of the equipment; and then set the SSM levels of the clock sources tracked by the transmission equipment. To verify the SSM response rules of the device, check the response changes of the transmission device at its different clock output ports. This requires testers to compare the requirements one by one, and flexibly build different test environments according to the instrument capabilities, equipment and instrument interface conditions, and test one by one. There is no unified test method.

The manual testing method has the following disadvantages: the test is carried out based on the tester's understanding of the standard, and the testing method is not uniform.

Corresponding to the 7 requirements to test one by one, it is necessary to set up multiple different test environments. In each test environment, sometimes it is necessary to traverse different SSM quality levels and perform multiple settings on the instrument. The connection is complicated, the settings are cumbersome, time-consuming, and easy error.

Each test result needs to be manually interpreted by the tester based on the data returned by the instrument and the device under test, and the tester must have extensive testing experience.

Contents of the invention

In view of this, the present application provides a test method for verifying SSM response rules, which can improve test efficiency and reduce human errors.

In order to solve the problems of the technologies described above, the technical solution of the present application is achieved in the following way:

A test method for verifying an SSM response rule, the method comprising:

Configure the first configuration information: send the SSM value of the synchronous Ethernet signal, the SSM value received by the first port, the SSM value received by the second port, and the SSM value received by the third port;

Performing a verification test for each SSM value configured in the first configuration information to send synchronous Ethernet signals includes:

The testing device sends a synchronous Ethernet signal through the first port, and carries an SSM value for sending the synchronous Ethernet signal;

When the device under test receives the synchronous Ethernet signal sent by the test device through the fourth port, it sends the corresponding synchronous Ethernet signal to the test device through the fourth port and the fifth port according to the configured SSM response rules, and sends the corresponding synchronous Ethernet signal to the test device through the sixth port. Frame 2Mb/s external timing signal to test equipment;

When the test device receives the synchronous Ethernet signal sent by the device under test through the first port, it determines whether the SSM value carried is the same as the SSM value received by the configured first port; the synchronous Ethernet signal sent by the device under test is received through the second port When receiving the signal, determine whether the value of the SSM carried is the same as the SSM value received by the configured second port; when receiving the framed 2Mb/s external timing signal sent by the device under test through the third port, determine whether the value of the SSM carried is the same as the SSM value received by the configured second port; Whether the SSM value received by the configured third port is the same; and record the comparison result;

When the test device determines that any comparison result of the records is different, it determines that the SSM response rule of the device under test is wrong, and displays the SSM values corresponding to the records with different comparison results.

As can be seen from the above technical solution, in this application, the SSM response is automatically verified by setting up a test environment for all possible rule requirements, configuring test input values, and expected output values, and comparing whether the actual test values are the same as the expected output values Are the rules correct. This solution can realize a standardized test process, improve test efficiency, and reduce human errors.

Description of drawings

Fig. 1 is the test schematic diagram of the first step verification SSM response rule in the embodiment of the present application;

Fig. 2 is a schematic diagram of the test flow for verifying the SSM response rule in the first step in the embodiment of the present application;

Fig. 3 is the test schematic diagram of the second step verification SSM response rule in the embodiment of the present application;

Fig. 4 is a schematic diagram of the test flow of the second step of verifying the SSM response rule in the embodiment of the present application;

Fig. 5 is the test schematic diagram of the third step verification SSM response rule in the embodiment of the present application;

FIG. 6 is a schematic diagram of the test flow of the third step of verifying the SSM response rule in the embodiment of the present application.

Detailed ways

In order to make the object, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described in detail below with reference to the accompanying drawings and examples.

In the embodiment of the present application, a test method for verifying the SSM response rules is provided. By building a test environment for all possible rule requirements and configuring test input values and expected output values, it is compared whether the actual test values are the same as the expected output values. , to automatically verify whether the SSM response rule is correct. This solution can realize a standardized test process, improve test efficiency, and reduce human errors.

When testing this application, first set up a test environment. In the specific implementation of this application, you can use a test device and a device under test to build three connection methods for three-step sequential testing, that is, after testing one connection method, then Test one connection method, and the execution sequence of these three steps is not limited; or build a test environment for three connection methods at the same time, and execute the three-step test in parallel.

In the embodiment of the present application, a test device and a device under test are taken as an example, that is, three-step tests are performed in sequence.

The test equipment in the embodiment of the present application can be a synchronous test instrument, which needs a built-in rubidium clock, or can track an external reference clock.

The process of verifying the SSM response rules in the three connection modes will be described in detail below with reference to the accompanying drawings.

For the first step of the test: only set the Ethernet signal as the synchronization reference source of the device under test, and check the SSM byte forwarding information of other synchronization ports.

Referring to FIG. 1, FIG. 1 is a schematic diagram of the first step of verifying the SSM response rule in the embodiment of the present application. The test equipment in Fig. 1 has two synchronous Ethernet ports (the first port and the second port), and a framing 2Mb/s external timer input port (the third port). The device under test has two synchronous Ethernet ports (the fourth port and the fifth port), and a framed 2Mb/s external timer output port (the sixth port).

The synchronous Ethernet ports mentioned here are all logical ports, which are actually physical ports that send and receive pairs.

Before testing, you need to configure the first configuration information, specifically including: the SSM value for sending synchronous Ethernet signals, the SSM value for receiving at the first port, the SSM value for receiving at the second port, and the SSM value for receiving at the third port. Among them, the SSM value received by the first port, the SSM value received by the second port, and the SSM value received by the third port are expected values, that is, the SSM value that should be responded when the SSM response rule on the device under test is correct.

Referring to Table 2, Table 2 shows relevant content configured for the first configuration information in the embodiment of the present application. The SSM value corresponding to the first column is the SSM value for sending synchronous Ethernet signals; the SSM value corresponding to the second column is the SSM value received by the first port; the SSM value corresponding to the third column is the SSM value received by the second port; The SSM value corresponding to the column is the SSM value received by the third port.

As shown in Table 2, when the SSM value of sending a synchronous Ethernet signal is 2, the SSM value received by the first port is F, the SSM value received by the second port is 2, and the SSM value received by the third port is 2;

When the SSM value of the synchronous Ethernet signal sent is 4, the SSM value received by the first port is F, the SSM value received by the second port is 4, and the SSM value received by the third port is 4;

When the SSM value of the synchronous Ethernet signal sent is 8, the SSM value received by the first port is F, the SSM value received by the second port is 8, and the SSM value received by the third port is 8;

When the SSM value of the synchronous Ethernet signal sent is B, the SSM value received by the first port is F, the SSM value received by the second port is B, and the SSM value received by the third port is B;

When the SSM value of the synchronous Ethernet signal sent is F, the SSM value received by the first port is B, the SSM value received by the second port is B, and the SSM value received by the third port is B;

When the SSM value of the synchronous Ethernet signal sent is 1, 3, 5, 6, 7, 9, A, C, D or E, the SSM value received by the first port is B, and the SSM value received by the second port is B, The SSM value received by the third port is B.

Table 2

The verification test process for each SSM value for sending synchronous Ethernet signals configured in the first configuration information is the same, and the process for using any SSM value for sending synchronous Ethernet signals for verification testing is given below, as shown in Figure 2 for details.

Referring to FIG. 2 , FIG. 2 is a schematic diagram of the test flow for the first step of verifying the SSM response rule in the embodiment of the present application. The specific steps are:

In step 201, the testing device sends a synchronous Ethernet signal through a first port, and carries an SSM value for sending the synchronous Ethernet signal.

Step 202, when the device under test receives the synchronous Ethernet signal sent by the test device through the fourth port, it sends the corresponding synchronous Ethernet signal to the test device through the fourth port and the fifth port according to the configured SSM response rule, and sends it through the sixth port Response framed 2Mb/s external timing signal to test equipment.

Step 203, when the test device receives the synchronous Ethernet signal sent by the device under test through the first port, determine whether the SSM value carried is the same as the SSM value received by the configured first port; When the synchronous Ethernet signal is used, determine whether the SSM value carried is the same as the SSM value received by the configured second port; when the framed 2Mb/s external timing signal sent by the device under test is received through the third port, determine the carried SSM value Whether the value is the same as the configured SSM value received by the third port, and record the comparison result.

Step 204, when the test device determines that any comparison result of the records is different, determine that the SSM response rule of the device under test is wrong, and display the SSM values corresponding to the records with different comparison results.

For the second step of the test: only set the frame 2Mb/s external timing signal as the synchronization reference source of the device under test, and check the SSM byte forwarding information of other synchronization ports.

Refer to FIG. 3 , which is a schematic diagram of the second step of verifying the SSM response rule in the embodiment of the present application. The test equipment in Fig. 3 has a synchronous Ethernet port (eighth port), a framing 2Mb/s external timer input port (ninth port), and a framing 2Mb/s external timer output port. The device under test has a synchronous Ethernet port (the eleventh port), a framed 2Mb/s external timer output port (the twelfth port) and a framed 2Mb/s external timer input port (the tenth port) .

The synchronous Ethernet ports mentioned here are all logical ports, which are actually physical ports that send and receive pairs.

Before testing, you need to configure the second configuration information, which specifically includes: the SSM value of the framed 2Mb/s external timing signal sent, the SSM value received by the eighth port, and the SSM value received by the ninth port; among them, the eighth port The received SSM value and the expected value of the SSM value received by the ninth port, that is, the SSM value that should be responded when the SSM response rule on the device under test is correct.

Referring to Table 3, Table 3 is related content configured for the second configuration information in the embodiment of the present application. The SSM value corresponding to the first column is the SSM value sent by the 2Mb/s external timing signal port of the test equipment; the SSM value corresponding to the second column is the expected SSM value received by the eighth port (the expected corresponding returned synchronous Ethernet signal is sent) SSM value), the SSM value corresponding to the third column is the expected SSM value received by the ninth port (the SSM value output by the expected 2Mb/s external timing port of the device under test).

table 3

As shown in Table 3, when the SSM value of the framed 2Mb/s external timing signal is 2, the SSM value received by the eighth port is 2, and the SSM value received by the ninth port is 2;

When the SSM value of the framed 2Mb/s external timing signal is 4, the SSM value received by the eighth port is 4, and the SSM value received by the ninth port is 4;

When the SSM value of the framed 2Mb/s external timing signal is 8, the SSM value received by the eighth port is 8, and the SSM value received by the ninth port is 8;

When the SSM value of the framed 2Mb/s external timing signal is B, the SSM value received by the eighth port is B, and the SSM value received by the ninth port is B;

When the SSM value of the framed 2Mb/s external timing signal is F, the SSM value received by the eighth port is B, and the SSM value received by the ninth port is B;

When the SSM value of the framed 2Mb/s external timing signal is 1, 3, 5, 6, 7, 9, A, C, D, or E, the SSM value received by the eighth port is B, and the received by the ninth port has an SSM value of B.

The verification test process is the same for the SSM value of each framed 2Mb/s external timing signal configured in the second configuration information. The following is the verification test process using any SSM value of the framed 2Mb/s external timing signal. , see Figure 4 for details.

Referring to FIG. 4 , FIG. 4 is a schematic diagram of the test flow of the second step of verifying the SSM response rule in the embodiment of the present application. The specific steps are:

In step 401, the testing device sends a framed 2Mb/s external timing signal through the seventh port, and carries the SSM value of sending the framed 2Mb/s external timing signal.

Step 402, when the device under test receives the framed 2Mb/s external timing signal sent by the test device through the tenth port, it sends a corresponding synchronous Ethernet signal to the test device through the eleventh port according to the configured SSM response rule; Twelve ports send responsive framed 2Mb/s external timing signals to test equipment.

Step 403, when the test device receives the synchronous Ethernet signal sent by the device under test through the eighth port, determine whether the SSM value carried is the same as the configured SSM value received by the eighth port; When framing a 2Mb/s external timing signal, determine whether the SSM value carried is the same as the SSM value received by the configured ninth port; and record the comparison result.

Step 404, when the test device determines that any comparison result of the records is different, it determines that the SSM response rule of the device under test is wrong, and displays the SSM values corresponding to the records with different comparison results.

For the second step test, the eighth port of the test equipment can use one of the first port and the second port in the first step test, and the ninth port can use the third port in the first step test; the device under test The eleventh port can use one of the fourth port and the fifth port in the first step test, and the twelfth port can use the sixth port in the first step test.

For the third step of the test: set the framed 2Mb/s external timing signal and synchronous Ethernet signal as the synchronization reference source of the device under test, and check the expected input reference.

Refer to FIG. 5 , which is a schematic diagram of the test of the third step of verifying the SSM response rule in the embodiment of the present application. The test equipment in Fig. 5 has a synchronous Ethernet port (the thirteenth port), and a framing 2Mb/s external timing output port (the fourteenth port). The device under test has a synchronous Ethernet port (the sixteenth port) and a framed 2Mb/s external timing input port (the fifteenth port).

The synchronous Ethernet ports mentioned here are all logical ports, which are actually physical ports that send and receive pairs.

Before testing, it is necessary to configure the third configuration information on the test equipment, specifically including: sending the SSM value of the framed 2Mb/s external timing signal, the SSM value of sending the synchronization signal, and the SSM value received by the thirteenth port; , the SSM value received by the thirteenth port is the expected value, that is, the SSM value that should be responded when the SSM response rule on the device under test is correct.

Set on the device under test that the SSM value received through the fifteenth port corresponds to a high priority; the SSM value received through the sixteenth port corresponds to a low priority.

Referring to Table 4, Table 4 shows relevant content configured for the third configuration information in the embodiment of the present application. The SSM value corresponding to the first column is the SSM value of sending a framed 2Mb/s external timing signal; the second column corresponds to the SSM value of sending a synchronous Ethernet signal, and the corresponding SSM value of the third column is the SSM value received by the thirteenth port. Column 4 is the comment item corresponding to column 3.

As shown in Table 4, when the SSM value of sending a framed 2Mb/s external timing signal is 2, the priority is high, and the SSM value of sending a synchronous Ethernet signal is 2, and the priority is low, the SSM received by the thirteenth port The value is 2;

When the SSM value of sending a framed 2Mb/s external timing signal is 4, the priority is high, and the SSM value of sending a synchronous Ethernet signal is 2, and the priority is low, the SSM value received by the thirteenth port is F;

When the SSM value of sending a framed 2Mb/s external timing signal is 4, the priority is high, and the SSM value of sending a synchronous Ethernet signal is 4, and the priority is low, the SSM value received by the thirteenth port is 4;

When the SSM value of sending a framed 2Mb/s external timing signal is 8, the priority is high, and the SSM value of sending a synchronous Ethernet signal is 4, and the priority is low, the SSM value received by the thirteenth port is F;

When the SSM value of sending a framed 2Mb/s external timing signal is 8, the priority is high, and the SSM value of sending a synchronous Ethernet signal is 8, and the priority is low, the SSM value received by the thirteenth port is 8;

When the SSM value of sending a framed 2Mb/s external timing signal is B, the priority is high, and the SSM value of sending a synchronous Ethernet signal is 8, and the priority is low, the SSM value received by the thirteenth port is F;

When the SSM value of sending a framed 2Mb/s external timing signal is B, the priority is high, and the SSM value of sending a synchronous Ethernet signal is B, and the priority is low, the SSM value received by the thirteenth port is B;

When the SSM value of sending a framed 2Mb/s external timing signal is F, the priority is high, and the SSM value of sending a synchronous Ethernet signal is B, and the priority is low, the SSM value received by the thirteenth port is F;

When the SSM value of sending a framed 2Mb/s external timing signal is F and the priority is high, and the SSM value of sending a synchronous Ethernet signal is F and its priority is low, the SSM value received by the thirteenth port is B.

Table 4

For the SSM value of each framed 2Mb/s external timing signal configured in the third configuration information, and the SSM value of the corresponding synchronization signal, the verification test process is the same. The SSM value of the signal and the process of verifying the SSM value of the corresponding synchronization signal are shown in Figure 6.

Referring to FIG. 6 , FIG. 6 is a schematic diagram of the test flow of the third step of verifying the SSM response rule in the embodiment of the present application. The specific steps are:

Step 601, the test equipment sends a synchronous Ethernet signal through the thirteenth port, and carries the SSM value of the synchronous Ethernet signal; sends a framed 2Mb/s external timing signal through the fourteenth port, and carries a framed 2Mb/s external timing signal The SSM value of the signal.

Step 602, when the device under test receives the framed 2Mb/s external timing signal sent by the test device through the fifteenth port, and receives the synchronous Ethernet signal sent by the test device through the sixteenth port, follow the configured SSM response rules Send the corresponding synchronous Ethernet signal to the test equipment through the sixteenth port.

Step 603: When the test device receives the synchronous Ethernet signal sent by the device under test through the thirteenth port, it determines whether the carried SSM value is the same as the configured SSM value received by the thirteenth port, and records the comparison result.

Step 604, when the test device determines that any comparison result of the records is different, determine that the SSM response rule of the device under test is wrong, and display the SSM values corresponding to the records with different comparison results.

For the third step test, the thirteenth port can use any one of the first port and the second port in the first step test; the sixteenth port can use the fourth port and the fifth port in the first step test Any of the ports.

It can be seen that when the application is actually implemented, both the test equipment and the equipment under test are equipped with two synchronous Ethernet ports and two framing 2Mb/s external timing ports to complete the test.

In the embodiment of the present application, the tests for the first step, the second step and the third step can be tested in parallel according to the actual test environment, or can be executed sequentially, but when executing, the execution of the first step, the second step and the third step The order is not limited.

When the verification test is performed on the first configuration information, the second configuration information and the third configuration information, when the test device determines that the recorded comparison results are the same, it is determined that the SSM response rule of the device under test is correct. That is, in the tests of the first step, the second step, and the third step, each test result is the same as the expected value configured in the corresponding Table 2, Table 3, and Table 4, indicating that the SSM response rule of the device under test is correct; Otherwise, it is determined that the SSM response rule of the device under test is wrong, and the SSM values corresponding to the records with different comparison results are displayed.

When the verification test is performed on the third configuration information, when the test device determines that any of the recorded comparison results are different, it is determined that the clock source preference sequence of the device under test is wrong. That is, when it is determined that the SSM response rule is wrong due to the third configuration information test, it is determined that the preferred clock source is also wrong.

When implementing the present application, a test environment is built manually, a corresponding test program is selected and run on the test equipment, and the test result is waited for by the test equipment. Convert test cases until all three test cases are run. The test efficiency is improved and human error is reduced through the automated test procedure; the automatic interpretation of the results makes the test simpler, especially suitable for centralized comparative tests where time is tight, there are many test equipment, and uniform test standards are required.

To sum up, this application automatically verifies whether the SSM response rules are correct by setting up a test environment for all possible rule requirements, configuring test input values, and expected output values, and comparing whether the actual test values are the same as the expected output values. . This solution can realize a standardized test process, improve test efficiency, and reduce human errors.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the present invention. within the scope of protection.

Claims (9)

1. a test method for verifying SSM response rules of synchronization status messages is characterized in that the method comprises the following steps:

Configuring first configuration information: sending an SSM value of the synchronous Ethernet signal, an SSM value received by the first port, an SSM value received by the second port and an SSM value received by the third port;

The performing the verification test for the SSM value of each of the transmission synchronous ethernet signals configured in the first configuration information includes:

the test equipment sends a synchronous Ethernet signal through a first port and carries an SSM value for sending the synchronous Ethernet signal;

When the tested device receives the synchronous Ethernet signal sent by the testing device through the fourth port, the tested device sends a response synchronous Ethernet signal to the testing device through the fourth port and the fifth port according to the configured SSM response rule, and sends a response framing 2Mb/s external timing signal to the testing device through the sixth port;

When the test equipment receives a synchronous Ethernet signal sent by the tested equipment through the first port, determining whether the carried SSM value is the same as the SSM value received by the configured first port; when receiving a synchronous Ethernet signal sent by the tested equipment through the second port, determining whether the carried SSM value is the same as the SSM value received by the configured second port; when a framing 2Mb/s external timing signal sent by the tested equipment is received through the third port, whether the carried SSM value is the same as the SSM value received by the configured third port is determined; and recording the comparison result;

And when the test equipment determines that any one of the comparison results of the records is different, determining that the SSM response rule of the tested equipment is wrong, and displaying the SSM value corresponding to the record with different comparison results.

2. The method of claim 1,

for the first configuration information, when the SSM value of the synchronous ethernet signal is 2, the SSM value received by the first port is F, the SSM value received by the second port is 2, and the SSM value received by the third port is 2;

When the SSM value of the transmitted synchronous ethernet signal is 4, the SSM value received by the first port is F, the SSM value received by the second port is 4, and the SSM value received by the third port is 4;

when the SSM value of the transmitted synchronous ethernet signal is 8, the SSM value received by the first port is F, the SSM value received by the second port is 8, and the SSM value received by the third port is 8;

when the SSM value of the sending synchronous Ethernet signal is B, the SSM value received by the first port is F, the SSM value received by the second port is B, and the SSM value received by the third port is B;

When the SSM value of the sending synchronous Ethernet signal is F, the SSM value received by the first port is B, the SSM value received by the second port is B, and the SSM value received by the third port is B;

when the SSM value of the transmitted synchronous ethernet signal is 1, 3, 5, 6, 7, 9, A, C, D or E, the SSM value received by the first port is B, the SSM value received by the second port is B, and the SSM value received by the third port is B.

3. The method of claim 1, further comprising:

Configuring second configuration information: sending an SSM value of a framing 2Mb/s external timing signal, an SSM value received by an eighth port and an SSM value received by a ninth port;

the performing verification tests on each SSM value configured in the second configuration information and used for sending the framing 2Mb/s external timing signal comprises the following steps:

The test equipment sends a framing 2Mb/s external timing signal through the seventh port and carries an SSM value of the framing 2Mb/s external timing signal;

When the tested device receives a framed 2Mb/s external timing signal sent by the testing device through the tenth port, sending a responsive synchronous Ethernet signal to the testing device through the eleventh port according to the configured SSM response rule; sending the corresponding framed 2Mb/s external timing signal to the test equipment through the twelfth port;

When the testing equipment receives the synchronous Ethernet signal sent by the tested equipment through the eighth port, determining whether the carried SSM value is the same as the SSM value received by the configured eighth port; when a framing 2Mb/s external timing signal sent by the tested device is received through the ninth port, whether the carried SSM value is the same as the SSM value received by the configured ninth port is determined; and recording the comparison result;

And when the test equipment determines that any one of the comparison results of the records is different, determining that the SSM response rule of the tested equipment is wrong, and displaying the SSM value corresponding to the record with different comparison results.

4. the method of claim 3,

for configuring the second configuration information, when the SSM value of the external timing signal sent into the frame 2Mb/s is 2, the SSM value received by the eighth port is 2, and the SSM value received by the ninth port is 2;

when the SSM value of the external timing signal which is sent into the frame 2Mb/s is 4, the SSM value received by the eighth port is 4, and the SSM value received by the ninth port is 4;

When the SSM value of the external timing signal which is sent into the frame 2Mb/s is 8, the SSM value received by the eighth port is 8, and the SSM value received by the ninth port is 8;

When the SSM value of the external timing signal sent into the frame 2Mb/s is B, the SSM value received by the eighth port is B, and the SSM value received by the ninth port is B;

When the SSM value of the external timing signal sent into the frame 2Mb/s is F, the SSM value received by the eighth port is B, and the SSM value received by the ninth port is B;

when the SSM value of the transmitted framed 2Mb/s external timing signal is 1, 3, 5, 6, 7, 9, A, C, D, or E, the SSM value received by the eighth port is B and the SSM value received by the ninth port is B.

5. The method of claim 3, further comprising:

The test equipment configures third configuration information: sending an SSM value of a framing 2Mb/s external timing signal, sending an SSM value of a synchronous Ethernet signal and receiving an SSM value by a thirteenth port;

the tested device sets the SSM value received through the fifteenth port to correspond to the high priority; the SSM value received by the sixteenth port corresponds to a low priority;

The performing verification tests on each SSM value of the sending synchronous Ethernet signals configured in the third configuration information and the corresponding SSM value of the sending framing 2Mb/s external timing signal comprises:

the test equipment sends the synchronous Ethernet signal through the thirteenth port and carries the SSM value of the sent synchronous Ethernet signal; sending a framed 2Mb/s external timing signal through a fourteenth port, and carrying an SSM value of the framed 2Mb/s external timing signal;

the tested device receives the framed 2Mb/s external timing signal sent by the testing device through the fifteenth port, and sends a response synchronous Ethernet signal to the testing device through the sixteenth port according to the configured SSM response rule when receiving the synchronous Ethernet signal sent by the testing device through the sixteenth port;

when the testing equipment receives the synchronous Ethernet signal sent by the tested equipment through the thirteenth port, determining whether the carried SSM value is the same as the SSM value received by the configured thirteenth port; and recording the comparison result;

and when the test equipment determines that any one of the comparison results of the records is different, determining that the SSM response rule of the tested equipment is wrong, and displaying the SSM value corresponding to the record with different comparison results.

6. The method of claim 5,

for the configured third configuration information, when the SSM value of the external timing signal sent into the frame 2Mb/s is 2, the priority is high, the SSM value of the synchronous ethernet signal sent into the frame is 2, and the priority is low, the SSM value received by the thirteenth port is 2;

when the SSM value of the external timing signal which is sent into the frame 2Mb/s is 4, the priority is high, the SSM value of the synchronous Ethernet signal is 2, and the priority is low, the SSM value received by the thirteenth port is F;

When the SSM value of the external timing signal which is sent into the frame 2Mb/s is 4, the priority is high, the SSM value of the synchronous Ethernet signal is 4, and the priority is low, the SSM value received by the thirteenth port is 4;

when the SSM value of the external timing signal which is sent into the frame 2Mb/s is 8, the priority is high, the SSM value of the synchronous Ethernet signal is 4, and the priority is low, the SSM value received by the thirteenth port is F;

When the SSM value of the external timing signal which is sent into the frame 2Mb/s is 8, the priority is high, the SSM value of the synchronous Ethernet signal is 8, and the priority is low, the SSM value received by the thirteenth port is 8;

When the SSM value of the external timing signal of 2Mb/s is B, the priority is high, the SSM value of the synchronous Ethernet signal is 8, and the priority is low, the SSM value received by the thirteenth port is F;

When the SSM value of the external timing signal which is sent into the frame 2Mb/s is B, the priority is high, the SSM value of the synchronous Ethernet signal is B, and the priority is low, the SSM value received by the thirteenth port is B;

when the SSM value of the external timing signal which is sent into the frame 2Mb/s is F, the priority is high, the SSM value of the synchronous Ethernet signal is B, and the priority is low, the SSM value received by the thirteenth port is F;

and when the SSM value of the external timing signal with the framing 2Mb/s is F, the priority is high, the SSM value of the synchronous Ethernet signal is F, and the priority is low, the SSM value received by the thirteenth port is B.

7. The method of claim 5, further comprising:

when the verification test is performed on the first configuration information, the second configuration information and the third configuration information, and when the test equipment determines that the recorded comparison results are the same, it is determined that the SSM response rule of the tested equipment is correct.

8. The method of claim 7, further comprising:

And when the test equipment determines that any recorded comparison result is different, determining that the clock source preference sequence of the tested equipment is wrong when the verification test is carried out on the third configuration information.

9. the method according to any one of claims 1 to 8,

the test equipment has a rubidium clock built-in, or can track an external reference clock.