CN112423334A - Emergency command communication link testing method and device - Google Patents
Emergency command communication link testing method and device Download PDFInfo
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Abstract
The application discloses a method and a device for testing an emergency command communication link. The method comprises the steps of carrying out physical layer link test on an emergency command communication link, and calculating the anti-interference capability of the emergency command communication link to obtain a physical layer link test result; carrying out communication layer link test on the emergency command communication link, and calculating the throughput rate, the packet loss rate and the time delay of the emergency command communication link to obtain a communication layer link test result; different weights are set for a physical layer link test and a communication layer link test of the emergency command communication link in advance, a test score of the emergency command communication link is obtained through calculation according to a physical layer link test result, a communication layer link test result and a corresponding set weight value, and the communication performance of the emergency command communication link is determined according to the test score. By adopting the technical scheme, the communication capacity of the communication link can be evaluated from the physical layer and the communication layer together, the normal communication of the emergency command communication can be ensured, and the emergency communication efficiency is improved.
Description
Technical Field
The application relates to the field of emergency communication, in particular to a method and a device for testing an emergency command communication link.
Background
The internet of things, as a typical representative of a new generation of information communication technology, has become a key basis and an important engine for the core drive of a new scientific and technological revolution and industrial revolution around the world and the green, intelligent and sustainable development of the economic society. Currently, the internet of things accelerates penetration and multidimensional fusion to each link of upstream and downstream of the traditional industry in the form of a ubiquitous sensing, lean control, data decision and other capability element sets, promotes industry upgrading and structure optimization, and promotes emerging industry states to emerge continuously. The method aims at realizing comprehensive integrated application of the technology of the Internet of things by taking automatic perception as a basis, taking data acquisition as a means and intelligent control as a core and carrying out fine management and service promotion, and the global Internet of things is wholly entering a new stage of substantial promotion and large-scale development.
In many fields of application of the internet of things, most of deployment implementation main bodies of the fields are government and public service departments and have high safety level requirements in multiple fields of national defense construction, emergency command and communication guarantee, national security, environmental data acquisition, forest fire prevention, geological disaster detection and the like. Therefore, the technology of the special communication internet of things is applied to intelligent information management systems such as emergency command communication systems and data link systems, and the development trend of the current technology is to provide services such as special equipment management, resource allocation, information perception and transmission, emergency communication, real-time decision, early warning and emergency management schemes.
Therefore, after the emergency communication architecture is set up, the emergency command communication link must be tested to ensure that the emergency command communication can realize good communication.
Disclosure of Invention
The application provides an emergency command communication link testing method, which comprises the following steps:
carrying out physical layer link test on the emergency command communication link, and calculating the anti-interference capability of the emergency command communication link to obtain a physical layer link test result;
carrying out communication layer link test on the emergency command communication link, and calculating the throughput rate, the packet loss rate and the time delay of the emergency command communication link to obtain a communication layer link test result;
different weights are set for a physical layer link test and a communication layer link test of the emergency command communication link in advance, a test score of the emergency command communication link is obtained through calculation according to a physical layer link test result, a communication layer link test result and a corresponding set weight value, and the communication performance of the emergency command communication link is determined according to the test score.
The method for testing the emergency command communication link, wherein the anti-interference capability of the emergency command communication link is calculated to obtain the physical layer link test result, specifically comprises the following substeps:
evaluating an idle channel of the emergency command communication link, scoring according to the idle channel grade to obtain a first anti-interference score, setting channel table parameters according to the idle channel after evaluation is passed, and performing dynamic channel selection;
testing the dynamic channel selection capability of the emergency command communication link, and grading according to the level of the dynamic channel selection capability to obtain a second anti-interference score;
testing the direct sequence spread spectrum capability and the frequency quick change capability of the emergency command communication link, and grading according to the direct sequence spread spectrum capability and the frequency quick change capability grades to obtain a third anti-interference score;
testing the response retransmission effect and the frame buffer amount of the emergency command communication link, and scoring according to the response retransmission effect and the frame buffer amount to obtain a fourth anti-interference score;
and calculating the average anti-interference score of the emergency command communication link to obtain a physical layer link test result.
The emergency command communication link testing method described above, wherein the idle channel assessment specifically includes: judging the signal energy of the signal, and if the signal energy is lower than a certain threshold amount, considering that the channel is idle; or judging the channel characteristics of the spread spectrum signal and the carrier frequency of the wireless channel; or the former two evaluation modes are integrated, the signal intensity and the signal characteristic are detected simultaneously, and the channel idle judgment is given.
The method for testing the emergency command communication link comprises the steps of testing dynamic channel selection capacity, specifically scanning all channels, confirming and adding a preset micron panchromatic band, reducing the number of same-frequency-band micron panchromatic bands, and reducing potential interference, wherein if an interference source appears on an overlapped channel, a software application channel algorithm on the upper layer of a coordinator selects a new channel.
The emergency command communication link testing method comprises the steps of testing a direct sequence spread spectrum technology, specifically testing whether a transmission distance is greater than a frequency hopping technology under the same other conditions; the ability to rapidly change frequency is tested, specifically by changing the frequency to avoid the effects of a known interferer or signal source.
The emergency command communication link testing method includes the following specific steps:
calculating the maximum available continuous subcarrier number of each subframe and the bit number which can be carried by each subframe;
selecting a proper transmission block set according to the number of continuous subcarriers and the number of carried bits;
and accumulating the transmission block sets and the corresponding check values of all the subframes according to the frame ratio and the special subframe ratio, calculating the final throughput, and calculating the throughput by dividing the throughput by the number of the subframes.
The emergency command communication link testing method described above, wherein the packet loss rate of the emergency command communication link is calculated, specifically, the percentage of the packets that cannot be forwarded due to lack of resources is calculated, and the calculation formula is D ═ L (L-L)1) % wherein L is the total number of packets, L1D is the packet loss rate, which is the number of received packets.
The method for testing the emergency command communication link includes calculating a time delay of the emergency command communication link, specifically, sending a predetermined number of data packets, recording a time when an intermediate data packet is sent and a time when the intermediate data packet arrives at a receiving port after being forwarded by the testing device, and calculating a speed at which the tested device processes the data packet, specifically, according to the following formula: latency ═ T2-T1(ii) a Wherein, T2Time of arrival of the first bit of the output frame at the output port, T1The time when the last bit of the input frame arrives at the input port.
The method for testing the emergency command communication link includes calculating a test score of the emergency command communication link, specifically calculating a physical layer link test result, i.e., a physical layer link test weight, and a communication layer link test result, i.e., a communication layer link test weight.
The application also provides an emergency command communication link testing arrangement, includes: the device executes the emergency command communication link testing method of any one of the above.
The beneficial effect that this application realized is as follows: by the adoption of the emergency command communication link testing method, the communication capacity of the communication link can be evaluated from the physical layer and the communication layer together, normal communication of emergency command communication can be guaranteed, and emergency communication efficiency is improved.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present invention, and other drawings can be obtained by those skilled in the art according to the drawings.
Fig. 1 is a flowchart of a method for testing an emergency command communication link according to an embodiment of the present disclosure;
FIG. 2 is a flow chart of a method of calculating the immunity of an emergency command communication link;
fig. 3 is a schematic diagram of an emergency command communication link testing apparatus according to a second embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The embodiment of the application provides an emergency command communication link testing method, which is applied to an emergency command communication system, wherein the emergency command communication system comprises a platform which organically integrates a communication system and an information system with rapid response, can synthesize various emergency service resources, uniformly command and jointly act, provides rapid and timely emergency rescue service for citizens, provides powerful guarantee for social public safety, and is widely applied to the industries of civil defense, army, bank, weather, earthquake and the like.
The emergency maneuvering command communication system comprises a fixed command center and an emergency maneuvering command communication vehicle; the emergency mobile command communication vehicle is an extension of a fixed command center, can quickly feed back the situation of an incident scene to the fixed command center, can be used as a scene emergency command communication center of an emergency, forms a scene command platform near the incident scene, provides support for various professional groups on the scene, provides support for leadership emergency decision and command of all levels of governments, and further improves the capability of all levels of governments for dealing with the emergency.
The emergency command communication system is used as a core function of the emergency communication command vehicle, and whether normal communication can be performed or not in emergency use is important. The performance of a link formed by connecting various short jumpers, connectors and communication equipment in the communication command car is directly related to the communication quality of a communication system, and a testing link is important in the emergency network construction process; the test of the emergency command communication link comprises a physical layer link test and a communication layer link test, communication problems caused by unqualified components, poor installation, equipment faults and the like can be found in time through the test, and the emergency communication capability of the emergency communication vehicle is guaranteed.
Example one
An embodiment of the present application provides an emergency command communication link testing method, as shown in fig. 1, the method specifically includes:
110, performing physical layer link test on the emergency command communication link, and calculating the anti-interference capability of the emergency command communication link to obtain a physical layer link test result;
in order to ensure the continuity, stability and reliability of data transmission of a physical layer link, the physical layer link needs to perform authentication tests on all links such as short jumper wires, connectors and the like in an emergency communication command vehicle before being put into use, namely, a copper cable link in the emergency communication command vehicle is tested;
in the copper cable link test, because the environment in the emergency communication command vehicle is complex, a generator power supply system and a communication system are in the same space, the power supply system can generate electromagnetic radiation to cause interference to cables, and the TIA 1005 standard is preferably adopted for detection according to the cable standard and MICE research; in TIA 1005-A, the anti-electromagnetic interference capability is divided into three grades of E1/E2/E3, corresponding fractional values are set for the three grades, and if a cable passes the grade test of E3, the anti-interference capability of a physical layer link is considered to be strong;
in the embodiment of the present application, the anti-interference capability of the emergency command communication link is calculated to obtain the physical layer link test result, as shown in fig. 2, the method specifically includes the following sub-steps:
the idle channel assessment specifically includes: judging the signal energy of the signal, and if the signal energy is lower than a certain threshold amount, considering that the channel is idle; or judging the channel characteristics of the spread spectrum signal and the carrier frequency of the wireless channel; or the former two evaluation modes are integrated, the signal intensity and the signal characteristics are detected simultaneously, and the channel idle judgment is given; and if the spatial channel evaluation meets the anti-interference standard index, determining that the anti-interference capability of the emergency command communication link on the idle channel evaluation is stronger, and continuing to perform the next test.
when the network is initialized or responds to the interrupt, the emergency communication link firstly scans a series of channels listed in the channel list parameters so as to carry out dynamic channel selection, and the channel list parameters are set according to the idle channels so as to enhance the coexistence performance of the network; during severe interference, the channel is not changed, but rather a low duty cycle, collision-free algorithm is relied upon to reduce data loss due to transmission collisions;
therefore, the dynamic channel selection capability is tested, specifically, all channels are scanned, then a proper PAN (micron panchromatic band) is confirmed and added, the number of the PANs in the same frequency band is reduced, potential interference is reduced, and if an interference source appears on the overlapped channels, software on the upper layer of the coordinator applies a channel algorithm to select a new channel;
for a communication link with strong anti-interference capability, a physical layer conforming to the IEEE 802.15.4 standard needs to have the capability of providing emulation in a collision avoidance mechanism, that is, if a channel is occupied by other devices, transmission exit is allowed without considering a communication protocol adopting the channel; therefore, if the channel with the interference signal lower than the preset signal can be selected, the anti-interference capability of the emergency command communication link is considered to be strong in dynamic channel selection, and the next test is continued.
specifically, whether a direct sequence spread spectrum technology is used in the emergency command communication link to achieve an anti-interference effect is tested, namely whether the transmission distance is greater than a frequency hopping technology under the same other conditions is tested, for example, the transmission distance can reach an action range of 30-50 m under the condition that the transmitting power is 0 dBm; in addition, the frequency fast-changing capability is tested, namely the frequency is changed to avoid the influence of a known interference source or signal source; and if the direct sequence spread spectrum capability and the frequency quick change capability of the emergency command communication link are tested to be stronger, confirming that the anti-interference capability of the emergency command communication link is stronger, and continuing to perform the next test.
specifically, the emergency command communication link needs to have the functions of automatic repeat request ARQ and frame buffer; when transmitting a data frame to a device, if the receiving device is in a busy or dormant state and cannot receive the frame, the main coordinating device of the network temporarily buffers the frame until the receiving end receives the frame; if the emergency command communication link has multiple response retransmissions or the frame buffer amount is large due to the low transmission speed, the anti-interference capability of the emergency command communication link is determined to be weak, otherwise, the anti-interference capability is determined to be strong.
in the embodiment of the application, for the plurality of test modes, a score level is set for the anti-interference capability of each test mode in advance, and when the score average value of the plurality of test modes reaches a preset score value, it is determined that the emergency command communication link has strong anti-interference capability.
Referring back to fig. 1, step 120, performing a communication layer link test on the emergency command communication link, and calculating a throughput rate, a packet loss rate and a time delay of the emergency command communication link to obtain a communication layer link test result;
in an emergency command communication link, the communication capability is the core technology of a communication network, the performance of the communication capability directly affects the communication stability, the reliability of corresponding equipment in the network is very important, and the test is the key guarantee of the quality; the method comprises the following steps of testing parameters such as throughput rate, packet loss rate, time delay, jitter, back-to-back and the like of a communication link of an emergency command vehicle, wherein the parameters need to be tested in a mode of testing two communication ends for testing the performance of the communication link:
(1) throughput rate: the maximum data flow which can be forwarded by the tested communication equipment under the condition of not losing packets. Usually measured in terms of the maximum number of packets or bytes passed per second (MB/s), and specifically includes the following sub-steps:
calculating the maximum available continuous subcarrier number of each subframe and the bit number which can be carried by each subframe;
selecting a proper transmission block set according to the number of continuous subcarriers and the number of carried bits;
accumulating the transmission block sets and the corresponding check values of all the subframes according to the frame ratio and the special subframe ratio, calculating the final throughput, and calculating the throughput rate by dividing the throughput by the number of the subframes;
and scoring according to the throughput rate grade to obtain a first communication layer test score.
(2) Packet loss rate: under a certain load, the percentage of the packets which cannot be forwarded due to lack of resources to the number of the packets which should be forwarded is specifically according to the following formula: d ═ L-L1) % wherein L is the total number of packets, L1D is a packet loss rate which reflects the capability of the tested equipment for bearing a specific load; and then, scoring according to the packet loss rate grade to obtain a second communication layer test score.
(3) Time delay: sending a certain amount of data packets, recording the sending time of the middle data packets and the time of the middle data packets arriving at a receiving port after being forwarded by the testing equipment, reflecting the speed of the tested equipment for processing the data packets, and specifically calculating according to the following formula: latency ═ T2-T1(ii) a Wherein, T2Time of arrival of the first bit of the output frame at the output port, T1The time at which the last bit of the input frame arrives at the input port; and then, scoring is carried out according to the time delay grade to obtain a third communication layer test score.
In this embodiment, the calculated communication layer test result is (the first communication layer test score + the second communication layer test score + the third communication layer test score)/3.
in the embodiment of the application, the total weight of the physical layer link test and the communication layer link test is 100%, the physical layer link test weight is preset to be 30%, the communication layer link test weight is 70%, the physical layer link test result plus 30% + 70% of the communication layer link test result is used for obtaining a final test score, if the final test score is higher than a preset value (such as 80 points), the transmission performance of the emergency command communication link is considered to be superior, otherwise, the link needs to be modified.
Example two
The second embodiment of the present application provides an emergency command communication link testing apparatus, as shown in fig. 3, including a physical layer link testing module 31, a communication layer link testing module 32, and a communication performance evaluating module 33;
firstly, a physical layer link test module 31 carries out physical layer link test on an emergency command communication link, and calculates the anti-interference capability of the emergency command communication link to obtain a physical layer link test result;
the physical layer link testing module 31 specifically includes an idle channel evaluation sub-module 311, a dynamic channel selection capability evaluation sub-module 312, a direct sequence spread spectrum capability and frequency fast change capability evaluation sub-module 313, and a response retransmission effect and frame buffer storage amount evaluation sub-module 314;
the idle channel evaluation sub-module 311 evaluates an idle channel of the emergency command communication link, performs scoring according to the idle channel grade to obtain a first anti-interference score, and sets channel table parameters according to the idle channel after evaluation is passed, and performs dynamic channel selection;
the dynamic channel selection capability evaluation sub-module 312 tests the dynamic channel selection capability of the emergency command communication link, and scores the dynamic channel selection capability according to the level of the dynamic channel selection capability to obtain a second anti-interference score;
the direct sequence spread spectrum capability and frequency quick change capability evaluation sub-module 313 tests the direct sequence spread spectrum capability and frequency quick change capability of the emergency command communication link, and scores are carried out according to the grades of the direct sequence spread spectrum capability and the frequency quick change capability to obtain a third anti-interference score;
the response retransmission effect and frame buffer amount evaluation submodule 314 tests the response retransmission effect and the frame buffer amount of the emergency command communication link, and performs scoring according to the response retransmission effect and the frame buffer amount to obtain a fourth anti-interference score.
Specifically, the idle channel estimation sub-module 311 is specifically configured to determine signal energy of the signal, and if the signal energy is lower than a certain threshold amount, the channel is considered idle; or judging the channel characteristics of the spread spectrum signal and the carrier frequency of the wireless channel; or the former two evaluation modes are integrated, the signal intensity and the signal characteristic are detected simultaneously, and the channel idle judgment is given.
The dynamic channel selection capability evaluation sub-module 312 is specifically configured to test the dynamic channel selection capability, specifically to scan all channels, then determine and add a suitable micron panchromatic band, reduce the number of PANs in the same frequency band, and reduce potential interference, and if an interference source appears on an overlapping channel, a software application channel algorithm on the upper layer of the coordinator selects a new channel.
The direct sequence spread spectrum capability and frequency quick change capability evaluation submodule 313 is specifically used for testing a direct sequence spread spectrum technology, specifically for testing whether the transmission distance is greater than a frequency hopping technology under the same other conditions; the ability to rapidly change frequency is tested, specifically by changing the frequency to avoid the effects of a known interferer or signal source.
The communication layer link test module 32 performs communication layer link test on the emergency command communication link, and calculates the throughput rate, the packet loss rate and the time delay of the emergency command communication link to obtain a communication layer link test result;
specifically, the communication layer link testing module 32 specifically includes a throughput testing submodule 321, a packet loss testing submodule 322, and a delay testing submodule 323;
the throughput rate testing sub-module 321 is specifically configured to calculate the maximum available number of continuous subcarriers per subframe and the number of bits that can be carried by each subframe; selecting a proper transmission block set according to the number of continuous subcarriers and the number of carried bits; and accumulating the transmission block sets and the corresponding check values of all the subframes according to the frame ratio and the special subframe ratio, calculating the final throughput, and calculating the throughput by dividing the throughput by the number of the subframes.
The packet loss rate testing sub-module 322 is specifically configured to calculate a percentage of the packets that cannot be forwarded due to lack of resources to the number of packets that should be forwarded, where the calculation formula is D ═ L (L-L)1) % wherein L is the total number of packets, L1D is the packet loss rate, which is the number of received packets.
The delay test submodule 323 is specifically configured to send a predetermined number of data packets, record time of sending an intermediate data packet, and time of arrival at a receiving port after forwarding through the test device, and calculate a speed at which the test device processes the data packet, specifically according to the following formula: latency ═ T2-T1(ii) a Wherein, T2Time of arrival of the first bit of the output frame at the output port, T1The time when the last bit of the input frame arrives at the input port.
The communication performance evaluation module 33 sets different weights for the physical layer link test and the communication layer link test of the emergency command communication link in advance, calculates a test score of the emergency command communication link according to the physical layer link test result, the communication layer link test result and the corresponding set weight value, and determines the communication performance of the emergency command communication link according to the test score;
specifically, the communication performance evaluation module 33 is specifically configured to calculate a physical layer link test result, a physical layer link test weight, a communication layer link test result, and a communication layer link test weight, so as to obtain a test score of the emergency command communication link.
The above-mentioned embodiments are only specific embodiments of the present application, and are used for illustrating the technical solutions of the present application, but not limiting the same, and the scope of the present application is not limited thereto, and although the present application is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: any person skilled in the art can modify or easily conceive the technical solutions described in the foregoing embodiments or equivalent substitutes for some technical features within the technical scope disclosed in the present application; such modifications, changes or substitutions do not depart from the spirit and scope of the present disclosure, which should be construed in light of the above teachings. Are intended to be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (10)
1. An emergency command communication link testing method is characterized by comprising the following steps:
carrying out physical layer link test on the emergency command communication link, and calculating the anti-interference capability of the emergency command communication link to obtain a physical layer link test result;
carrying out communication layer link test on the emergency command communication link, and calculating the throughput rate, the packet loss rate and the time delay of the emergency command communication link to obtain a communication layer link test result;
different weights are set for a physical layer link test and a communication layer link test of the emergency command communication link in advance, a test score of the emergency command communication link is obtained through calculation according to a physical layer link test result, a communication layer link test result and a corresponding set weight value, and the communication performance of the emergency command communication link is determined according to the test score.
2. The emergency command communication link testing method according to claim 1, wherein the step of calculating the anti-interference capability of the emergency command communication link to obtain the physical layer link testing result specifically comprises the following substeps:
evaluating an idle channel of the emergency command communication link, scoring according to the idle channel grade to obtain a first anti-interference score, setting channel table parameters according to the idle channel after evaluation is passed, and performing dynamic channel selection;
testing the dynamic channel selection capability of the emergency command communication link, and grading according to the level of the dynamic channel selection capability to obtain a second anti-interference score;
testing the direct sequence spread spectrum capability and the frequency quick change capability of the emergency command communication link, and grading according to the direct sequence spread spectrum capability and the frequency quick change capability grades to obtain a third anti-interference score;
testing the response retransmission effect and the frame buffer amount of the emergency command communication link, and scoring according to the response retransmission effect and the frame buffer amount to obtain a fourth anti-interference score;
and calculating the average anti-interference score of the emergency command communication link to obtain a physical layer link test result.
3. The emergency command communication link testing method of claim 2, wherein the clear channel assessment specifically comprises: judging the signal energy of the signal, and if the signal energy is lower than a certain threshold amount, considering that the channel is idle; or judging the channel characteristics of the spread spectrum signal and the carrier frequency of the wireless channel; or the former two evaluation modes are integrated, the signal intensity and the signal characteristic are detected simultaneously, and the channel idle judgment is given.
4. The emergency command communication link testing method of claim 2, wherein the dynamic channel selection capability is tested by scanning all channels, then confirming and adding a preset micron panchromatic band, reducing the number of same-frequency band micron panchromatic bands and reducing potential interference, and if an interference source appears on an overlapping channel, a software application channel algorithm on the upper layer of the coordinator selects a new channel.
5. The emergency command communication link testing method of claim 2, wherein a direct sequence spread spectrum technique is tested, specifically to test whether a transmission distance is greater than a frequency hopping technique under otherwise identical conditions; the ability to rapidly change frequency is tested, specifically by changing the frequency to avoid the effects of a known interferer or signal source.
6. The emergency command communication link testing method of claim 1, wherein calculating the throughput rate of the emergency command communication link comprises the following sub-steps:
calculating the maximum available continuous subcarrier number of each subframe and the bit number which can be carried by each subframe;
selecting a proper transmission block set according to the number of continuous subcarriers and the number of carried bits;
and accumulating the transmission block sets and the corresponding check values of all the subframes according to the frame ratio and the special subframe ratio, calculating the final throughput, and calculating the throughput by dividing the throughput by the number of the subframes.
7. The emergency command communication link testing method according to claim 1, wherein the packet loss rate of the emergency command communication link is calculated, specifically, the percentage of the packets that cannot be forwarded due to lack of resources is calculated, and the calculation formula is D ═ L (L-L)1) % wherein L is the total number of packets, L1D is the packet loss rate, which is the number of received packets.
8. The emergency command communication link testing method according to claim 1, wherein the time delay of the emergency command communication link is calculated, specifically, a predetermined number of data packets are sent, the time of sending the intermediate data packet and the time of arrival at the receiving port after being forwarded by the testing device are recorded, and the speed of processing the data packet by the tested device is calculated, specifically, according to the following formula: latency ═ T2-T1(ii) a Wherein, T2Time of arrival of the first bit of the output frame at the output port, T1The time when the last bit of the input frame arrives at the input port.
9. The method according to claim 1, wherein the test scores of the emergency command communication links are calculated, specifically, the physical layer link test result is calculated as the physical layer link test weight and the communication layer link test result is calculated as the communication layer link test weight.
10. An emergency command communication link testing device, comprising: the apparatus performs the emergency command communication link testing method of any of claims 1-9.
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