CN113162872A - Self-detection ARINC818 switch capable of dynamically switching and monitoring - Google Patents
Self-detection ARINC818 switch capable of dynamically switching and monitoring Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L49/00—Packet switching elements
- H04L49/10—Packet switching elements characterised by the switching fabric construction
- H04L49/101—Packet switching elements characterised by the switching fabric construction using crossbar or matrix
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L43/00—Arrangements for monitoring or testing data switching networks
- H04L43/08—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters
- H04L43/0805—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters by checking availability
- H04L43/0817—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters by checking availability by checking functioning
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L43/00—Arrangements for monitoring or testing data switching networks
- H04L43/08—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters
- H04L43/0823—Errors, e.g. transmission errors
- H04L43/0847—Transmission error
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L49/00—Packet switching elements
- H04L49/55—Prevention, detection or correction of errors
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Abstract
The invention belongs to the computer communication technology, and discloses a self-detection dynamically switchable monitorable ARINC818 switch design method, wherein a switch is designed by adopting an FPGA (field programmable gate array), the switching logic is designed based on a crossbar architecture, a channel selection controller realizes port data format matching based on ICD (interface control device) and routing selection and control based on crossbar, an input/output monitoring selector realizes data monitoring of a specified input port or output port, a test sequence generator realizes the test function of the switch port, and a test data comparator realizes the comparison of different input and output port data Self-detection of output ports and forwarding channels.
Description
Technical Field
The invention belongs to the computer communication technology, and relates to a self-detection ARINC818 switch capable of dynamically switching and monitoring.
Background
The ARINC818 avionics environment digital video bus protocol is an interface and standard specification established to meet high bandwidth, low latency, uncompressed digital video transport, supporting point-to-point and switch switching topologies. The traditional ARINC818 switch adopts a circuit switching mode to transmit data, and establishes a special link channel between a specific input port and an output port to transmit ARINC818 digital video data, the switch only simply integrates the ARINC818 receiving and transmitting nodes in a video image transmission system, if the channels need to be changed, the channels can be changed only in a static switching mode, the switching mode is very inflexible, the selection of the switching channels is limited, and the adaptability of corresponding ICD files is poor; the switch does not provide a monitoring port, does not support the real-time monitoring of the specified channel data, and is inconvenient for debugging, testing and troubleshooting; in addition, in the specific use process of the airborne environment, if a specific input port, an output port or a specific channel of the switch has a data forwarding error, the switch usually needs to be removed and fault detection and troubleshooting are performed through external special test equipment, which brings much invariance to problem positioning and processing.
Disclosure of Invention
The invention aims to provide a design method of a dynamic switching monitorable ARINC818 switch with a self-detection function, which realizes the basic architecture, the dynamic switching function and the channel data monitoring function of the ARINC818 switch, realizes the self-detection function of a specific input port, an output port and a forwarding channel of the switch, changes the static circuit switching mode of the traditional ARINC818 switch, and provides a switched data monitoring means and a self-detection means, thereby improving the flexible adaptation characteristic of the ARINC818 switch to different application modes and the convenience in the comprehensive debugging test and fault troubleshooting process of a system.
The technical solution of the invention is that ARINC818 exchanger adopts FPGA to design, realizes n input ports and n output ports of the exchanger by MGT high-speed transceiver integrated by FPGA, realizes the analysis and encapsulation of data frames based on ARINC818-IP, designs the exchange logic based on crossbar architecture, designs a channel selection controller to realize the port data format matching based on ICD and the routing selection and control based on crossbar, designs an input/output monitoring selector to realize the ARINC818 data monitoring of the appointed input port or output port, designs an ARINC818 test sequence generator to realize the test function of the exchanger port, realizes the reading of ICD files and the control of channel selection, input/output monitoring selector and ARINC818 test sequence generator by an internal controller, designs a test data comparator to realize the comparison of different input and output port data by controlling the routing selection and monitoring scheme, the detection function of specific faults is realized by implementing different test schemes and comparing, and meanwhile, the instruction sending to the controller can be realized through an I2C interface.
The invention has the advantages that:
1) flexible routing channel design: the switching channel is non-statically fixed, the design is carried out based on a crossbar (cross switch matrix) architecture, a cross switch matrix channel is established between a single input port and all output ports, and the communication of a specific channel can be realized by closing a specific cross point;
2) switching channel switchable function: the ICD-based port data format matching and the dynamic routing selection and switching control of the switching channel are realized through the channel selection controller;
3) providing a data monitoring function: an input/output monitoring selector is designed to realize ARINC818 data monitoring of a specified input port or output port, and convenience and easiness in the comprehensive debugging test and troubleshooting process of the system are improved;
4) providing a test data generation function: the ARINC818 test sequence generator is designed to realize the test function of the port of the switch, so that the testability of the switch is improved;
5) possess the self-checking function: the self-detection of the specific input port, the specific output port and the specific forwarding channel of the switch can be realized without depending on external test equipment.
Drawings
Fig. 1 is a functional block diagram of a switch equipped with an ARINC818 self-test function.
Detailed Description
The following describes an n-port ARINC818 switch (n-way input port and n-way output port) implementation in detail with reference to the drawings.
ARINC818 switch functional architecture as shown in fig. 1:
ARINC818-IP for receiving, sending and analyzing ARINC818 frame data; realizing ARINC818 receiving state machine, receiving data signal from MGT, maintaining synchronous state, detecting 8b/10b decoded effective data, generating 32 bit signal output; realizing ARINC818 framing, analyzing received data and an ordered set, wherein the ordered set comprises SOFi1, SOFi3, SOFn1, SOFn3, EOFn, EOFt and Idle, and other ordered sets except the ordered sets are treated as Idle; monitoring the state of the ARINC818 channel link is realized; and the ARINC818 frame CRC check and error statistics functions are realized.
The MGT high-speed transceiver adopts the high-speed transceiver carried by the FPGA to realize the functions of link synchronization, serial-parallel conversion, 8B/10B coding and a physical layer specified by a protocol.
The configuration register stores a power-on default point-point routing table, a multicast routing table, a monitoring scheme and an ICD file with a default corresponding input port; wherein the point-point routing table defines which specific output port the current ARINC818 input port communicates with, the multicast routing table defines which specific output port the current ARINC818 input port communicates with and implements multicast transmission of data on these channels, and the content of the ICD file includes video format, pixel information, output scanning mode, link rate, frame rate, synchronization characteristics, etc.;
the channel selection controller is used for realizing the routing selection and switching from the current ARINC818 input port to any output port or any group of ports according to the power-on configuration information in the configuration register or controlled by the controller; when the power is on, the current channel selection controller receives initial information related to a corresponding ARINC818 input port, which is sent by the controller and acquired by reading a configuration register of the current channel selection controller, and judges and realizes channel gating of a specified output port or a group of output ports; in the working process, the current channel selection controller receives a control instruction sent by the controller, so that the switching of a routing channel from a current input port routing channel to another output port or another group of output ports is realized, in order to prevent the integrity of a video frame in exchange transmission from being damaged, the channel selection controller analyzes an ICD file corresponding to the video data of the current port, judges the exchange switching time according to the video format defined by the ICD and the end time of the last image (namely the finish time of the last frame of the last video container), and controls the switching to be carried out among 2 video containers defined by an ARINC818 protocol, namely controls the channel switching time to occur in the vertical blanking period of the video frame so as to ensure the integrity of the video in the channel switching process;
the crossbar matrix adopts a crossbar structure to realize a minimum delay design, provides n input ports and n output ports to be randomly interconnected, and can transmit data simultaneously as long as a plurality of different ports of a plurality of cross nodes are closed simultaneously, thereby providing a flexible and unobstructed routing path for the ARINC818 switch to ensure the minimization of transmission delay, and controlling the routing gating corresponding to the input ports of the ARINC818 switch by a channel selection controller at present;
the ARINC818 test sequence generator is used for generating test video data meeting the ARINC818 protocol and ICD definition requirements and used for testing an output port of the switch; the ARINC818 switch is controlled by the controller to run in a test mode or a normal working mode, the ARINC818 test sequence generator starts to run in the test mode, the controller performs test port gating control to generate standard test video data and output the standard test video data from a specific port according to a test scheme, and self-detection of the specific input port, the specific output port and the forwarding channel of the ARINC818 switch is realized by combining a self-detection method and a test data comparator comparison conclusion;
the ARINC818 switch provides 2-way ARINC818 data monitoring ports, and can realize the data monitoring function of any input port or any output port; all input ports and all output port channels of the ARINC818 switch are connected with an input/output monitoring selector, the input/output monitoring selector provides 2 paths of output ports to realize monitoring data output, and the controller controls the input/output monitoring selector according to a monitoring scheme in the configuration register to realize data output gating from any ARINC818 input port or output port data to a specific monitoring port;
the controller realizes the functions of ICD configuration, communication configuration, monitoring configuration, multicast configuration, channel switching, test control, channel health state inquiry and recording and the like; when an input port frequently detects error frames (such as CRC errors, frame format errors and the like) in unit time, closing the input port, and not forwarding data frames received by the input interface to a corresponding output port any more, wherein the faults are recorded and output by a controller;
the serial port controller is used as an external interface of the controller, realizes command response and information output, provides an external communication serial port for the controller, can realize a routing forwarding function, a multicast mapping function and a dynamic switching output function among ARINC818 specific channels through external control, and simultaneously supports the external control of the controller to realize ARINC818 test starting and monitoring scheme switching functions;
the test data comparator receives original test data input by the ARINC818 test sequence generator, receives monitoring data information input by the monitoring port 0 and the monitoring port 1, compares the monitoring information with the original test data respectively and outputs a result to the controller; the gating control of the port corresponding to the original data output is realized by the ARINC818 test sequence generator under the control of the controller, and the monitoring of the specific input port or output port is realized by the input/output monitoring selector under the control of the controller.
ARINC818 switch self-detection scheme is as follows:
1-to-1 interconnection is realized between output ports [0-n ] and input ports [0-n ] of an ARINC818 switch through optical fibers and a coupler, and an outer loop path between an output port 0- > input port 0 and an output port 1- > input port 1 … and an output port n- > input port n is formed; the monitoring port 0 and the test input port 0 are interconnected through an optical fiber, and the monitoring port 1 and the test input port 1 are interconnected through an optical fiber.
The "controller" controls "the channel selection controller", "ARINC 818 test sequence generator", "input/output monitor selector", and "test data comparator" to develop the route traversal strobe test.
The ARINC818 test sequence generator respectively sends test video data to each output port [0-n ], the input/output monitoring selector correspondingly tests different port data each time, the test data comparator outputs a comparison result of monitoring port 0 data and monitoring port 1 data each time to the controller, and the routing traversal gating test is changed according to the following rules:
the first round of testing:
sending for the first time: ARINC818 test sequencer- > output port 0- > input port 0 (monitor port 0 monitors input port 0, monitor port 1 monitors output port 0);
and (3) sending for the second time: ARINC818 test sequence generator- > output port 0- > input port 0- > output port 1- > input port 1 (monitor port 0 monitors input port 1, monitor port 1 monitors output port 1);
……
and (3) sending for the nth time: a ARINC818 test sequencer- > output port 0- > input port 0- > output port n- > input port n (monitor port 0 monitors input port n, monitor port 1 monitors output port n).
In the first round each time the test data comparator outputs a test result to the controller.
And (3) testing in a second round:
sending for the first time: ARINC818 test sequencer- > output port 1- > input port 1- > output port 0- > input port 0 (monitor port 0 monitors input port 0, monitor port 1 monitors output port 0);
and (3) sending for the second time: ARINC818 test sequence generator- > output port 1- > input port 1 (monitor port 0 monitors input port 1, monitor port 1 monitors output port 1);
……
and (3) sending for the nth time: a ARINC818 test sequencer- > output port 1- > input port 1- > output port n- > input port n (monitor port 0 monitors input port n, monitor port 1 monitors output port n).
In the second round the test data comparator outputs the test result to the controller each time.
……
And (3) testing in the nth round:
sending for the first time: ARINC818 test sequencer- > output port n- > input port n- > output port 0 (monitor port 0 monitors input port 0, monitor port 1 monitors output port 0);
and (3) sending for the second time: ARINC818 test sequencer- > output port n- > input port n- > output port 1 (monitor port 0 monitors input port 1, monitor port 1 monitors output port 1);
……
and (3) sending for the nth time: a ARINC818 tests the sequencer- > output port n- > input port n- > output port n (monitor port 0 monitors input port n, monitor port 1 monitors output port n).
In the nth round, the data comparator outputs the test result to the controller each time.
In the self-detection process, the test data comparator in each round of test compares original test data received by the A port and generated by the ARINC818 test sequence generator with corresponding input port data monitoring received by the B port, and the comparison result is sent to the controller; the test data comparator compares the original test data generated by the ARINC818 test sequence generator received by the A port with the corresponding output port monitoring data received by the C port, and the comparison result is sent to the controller:
if the comparison result of each round of test is correct, the detection of the input port, the output port and the forwarding channel is correct;
if the data of the monitoring port 1 is correct but the data of the monitoring port 0 is wrong by the test data comparator in the ARINC818 test sequence generator- > output port M- > input port M- > output port N- > input port N (monitoring port 0 monitors input port N, monitoring port 1 monitors output port N)' test, the output port N or the input port N has faults; if the data comparison result of the monitoring port 0 data and the monitoring port 1 data by the test data comparator is wrong, the forwarding channels possibly having faults at the output port M, the input port M, the output port N, the input port N and the input port M- > output port N are detected through the steps (3), (4) and (5) respectively;
comparing test results of 'ARINC 818 test sequence generator- > output port X- > input port X- > output port M- > input port M (monitoring port 0 monitors input port M, monitoring port 1 monitors output port M)' in other test rounds, if data comparison of the data comparator to the monitoring port 0 is correct, the forwarding channel of the input port M- > output port N has faults, and fault information is output by the controller through a serial interface;
comparing test results of 'ARINC 818 test sequence generator- > output port X- > input port X- > output port M- > input port M (monitor port 0 monitors input port M, monitor port 1 monitors output port M)' in other test rounds, if the data comparator compares the data of monitor port 1 correctly but the data of monitor port 0 incorrectly, the input port M or the output port M has a fault; connecting an output port M optical fiber with any correct test input port Y, executing a test, wherein the ARINC818 test sequence generator- > output port M- > input port Y (monitor port 0 monitor input port Y) ", if a data comparator compares the data of the monitor port 0 correctly, the output port M is correct, the input port M fails, and the failure information is output by a controller through a serial interface; otherwise, the output port M fails, and the failure information is output by the controller through the serial interface;
comparing test results of 'ARINC 818 test sequence generator- > output port X- > input port X- > output port N- > input port N (monitor port 0 monitors input port N, monitor port 1 monitors output port N)' in other rounds of tests, if the data comparator compares the data of monitor port 1 correctly but the data of monitor port 0 incorrectly, the input port N or the output port N has a fault, and the fault information is output by the controller through a serial interface; connecting an optical fiber of an output port N with any input port Y with correct test, and executing test "" ARINC818 test sequence generator- > output port N- > input port Y (monitoring port 0 monitoring input port Y) ", wherein if the data comparator compares the data of the monitoring port 0 correctly, the output port N is correct, the input port N fails, and the failure information is output by the controller through a serial interface; otherwise, the output port N has faults, and fault information is output by the controller through the serial interface.
The technical scheme of the invention is directed at the defects that the ARINC818 switch in the traditional architecture does not support dynamic switching and monitoring functions, innovatively provides a design method and a self-detection scheme of a switchable and monitorable ARINC818 switch, realizes the dynamic switching function and the channel data monitoring function of the ARINC818 switch, realizes the self-detection function of a specific input port, an output port and a forwarding channel of the switch, improves multi-scenario support in the using process of the switch, and enhances the fault testing method and the testing efficiency in the debugging and using processes.
The invention realizes the basic architecture and dynamic switching function of the ARINC818 switch, the channel data monitoring function and the switch self-detection function, changes the static circuit switching mode of the traditional ARINC818 switch, provides a switched data monitoring means, improves the flexible adaptation characteristic of the ARINC818 switch to different application modes and the convenience and the easiness in the comprehensive debugging test and troubleshooting process of the system, and provides a convenient switch self-detection test method. The ARINC818 switch is characterized in that the ARINC818 switch is designed by adopting FPGA, switching logic is designed based on crossbar architecture, a design channel selection controller realizes port data format matching based on ICD and routing selection and control based on crossbar, a design input/output monitoring selector realizes ARINC818 data monitoring of a designated input port or output port, an ARINC818 test sequence generator realizes the test function of the switch port, ICD file reading and channel selection control, an input/output monitoring selector and the ARINC818 test sequence generator are realized by an internal controller, a design test data comparator realizes the comparison of different input and output port data by controlling routing selection and monitoring schemes, the detection function of specific faults is realized by implementing different test schemes and comparing, meanwhile, the instruction transmission to the controller can be realized through the serial interface. The invention has flexible route channel design, the exchange channel can realize dynamic route selection and switching control, can realize ARINC818 data monitoring of the appointed input port or output port, simultaneously provides a test data generating function to improve the testability of the exchanger, and can realize the intersection without depending on external test equipment.
Claims (8)
1. A self-test dynamically switchable monitorable ARINC818 switch implemented based on an FPGA controller, said switch comprising: the cross switch matrix unit is respectively connected with n channel selection controllers of n input ends of the cross switch matrix unit in a one-to-one correspondence mode, the input end of each channel selection controller is connected with one ARINC818-IP, the input end of each ARINC818-IP is connected with one MGT high-speed transceiver, the input ends of the n MGT high-speed transceivers are connected with an external data input end, and the n MGT high-speed transceivers are numbered from 1 to n in sequence;
the n ARINC 818-IPs are respectively connected with the n output ends of the cross switch matrix unit in a one-to-one correspondence mode, the output end of each ARINC818-IP is connected with one MGT high-speed transceiver, the output ends of the n MGT high-speed transceivers are used as final data output ports, and the n MGT high-speed transceivers are numbered from 1 to n in sequence;
the MGT high-speed transceiver adopts a high-speed transceiver carried by the FPGA to realize the functions of link synchronization, serial-parallel conversion, 8B/10B coding and a physical layer specified by a protocol;
the ARINC818-IP realizes the analysis and encapsulation of the input data frame;
the channel selection controller realizes the routing selection and control based on the crossbar unit;
the crossbar unit adopts a crossbar structure to realize a minimum delay design, provides arbitrary interconnection of n input ports and n output ports, and can transmit data simultaneously when a plurality of different ports of a plurality of cross nodes are closed simultaneously;
the switch further comprises: an internal controller and a serial port controller;
the internal controller realizes reading ICD files, communication configuration and channel switching of the channel selection controller, monitoring configuration of the input/output monitoring selector and test control of the test sequence generator, and realizes instruction receiving and sending of the serial interface to the internal controller through the control of the serial port controller;
the serial port controller is used as an external interface of the internal controller, realizes command response and information output, provides an external communication serial port for the internal controller, realizes a routing forwarding function, a multicast mapping function and a dynamic switching output function among ARINC818 specific channels through external control, and realizes the switching of a test function and a monitoring function through external control;
the switch further comprises: a configuration register;
the configuration register stores a power-on default point-point routing table, a multicast routing table, a monitoring scheme and an ICD file with a default corresponding input port; wherein the point-to-point routing table defines which specific output port the current ARINC818 input port communicates with, the multicast routing table defines which specific set of output ports the current ARINC818 input port communicates with and enables multicast transmission of data over these channels, and the content of the ICD file includes at least video format, pixel information, output scan mode, link rate, frame rate, synchronization characteristics.
2. The self-test dynamically switchable monitorable ARINC818 switch according to claim 1 and further comprising: an input/output monitor selector; the input and output monitoring selector is provided with a first input end, a second input end, a first monitoring output end and a second monitoring output end;
the output end of each ARINC818-IP of the input ends is respectively connected with the first input end of the input-output monitoring selector, and each output end of the cross switch matrix unit is respectively connected with the second input end of the input-output monitoring selector;
the input and output monitoring selector realizes data monitoring of the designated input port or output port.
3. The self-test dynamically switchable monitorable ARINC818 switch according to claim 2 and further comprising: a test sequence generator;
the test sequence generator is used for generating test video data meeting the ARINC818 protocol and ICD definition requirements and testing an output port of the switch; the ARINC818 switch is controlled by the controller to run in a test mode or a normal working mode, in the test mode, the ARINC818 test sequence generator starts to run, the controller carries out test port gating control, standard test video data are generated and output from a specific port according to a test scheme.
4. The self-test dynamically switchable monitorable ARINC818 switch according to claim 3 and further comprising: the test data comparator receives original test data input by the ARINC818 test sequence generator, receives monitoring data information input by the first monitoring output end and the second monitoring output end, compares the monitoring data information with the original test data respectively and outputs the result to the controller;
the gating control of the port corresponding to the original data output is realized by the test sequence generator under the control of the controller, and the monitoring of the specific input port or output port is realized by the input/output monitoring selector under the control of the controller.
5. The switch of claim 1, wherein the channel selection controller is further configured to implement routing and switching from a current ARINC818 input port to any output port or any group of ports according to power-on configuration information in a configuration register or controlled by an internal controller;
when the power is on, the current channel selection controller receives initial information related to a corresponding ARINC818 input port sent by an internal controller or obtained by reading a configuration register, and judges and realizes channel gating of a specified output port or a group of output ports;
in the working process, the current channel selection controller receives a control instruction sent by the internal controller to realize the switching of the routing channel from the current input port routing channel to another output port or another group of output ports, and the channel selection controller judges the channel switching time according to the video format defined by the ICD and the ending time of the previous image.
6. The self-detection dynamically-switchable monitorable ARINC818 switch according to claim 4 and wherein 1-to-1 interconnection between output ports [0-n ] and input ports [0-n ] of ARINC818 switch is realized by optical fiber and coupler to form outer loop path between output port 0- > input port 0, output port 1- > input port 1 … and output port n- > input port n; the monitoring port 0 and the test input port 0 are interconnected through optical fibers, and the monitoring port 1 and the test input port 1 are interconnected through optical fibers;
the "controller" controls "the channel selection controller", "ARINC 818 test sequence generator", "input/output monitor selector", and "test data comparator" to develop the route traversal strobe test.
7. The self-test dynamically-switchable monitorable ARINC818 switch according to claim 6 and wherein the route traversal gating test rules are as follows:
a total of N runs, N ═ 0-N, were performed, with each run as follows:
sending for the first time: ARINC818 test sequencer- > output port N- > input port N- > output port 0 (monitor port 0 monitors input port 0, monitor port 1 monitors output port 0);
and (3) sending for the second time: ARINC818 test sequencer- > output port N- > input port N- > output port 1 (monitor port 0 monitors input port 1, monitor port 1 monitors output port 1);
……
and (3) sending for the nth time: ARINC818 test sequencer- > output port N- > input port N- > output port N (monitor port 0 monitors input port N, monitor port 1 monitors output port N);
in each round of test, the comparator outputs the test result to the controller.
8. The switch of claim 7, wherein the following self-test procedures are performed according to the test result:
(1) if the comparison result of each round of test is correct, the detection of the input port, the output port and the forwarding channel is correct;
(2) if the data of the monitor port 1 is correct but the data of the monitor port 0 is wrong by the test data comparator in the test of 'ARINC 818 test sequence generator- > output port M- > input port M- > output port N- > input port N (monitor port 0 monitors input port N, monitor port 1 monitors output port N)', the output port N or the input port N has a fault; if the data comparison result of the monitoring port 0 data and the monitoring port 1 data by the test data comparator is wrong, a fault may exist in the forwarding channels of the output port M, the input port M, the output port N, the input port M- > and the output port N, and the detection is performed through the steps (3), (4) and (5) respectively;
(3) comparing test results of the ARINC818 test sequence generator- > output port X- > input port X- > output port M- > input port M (monitoring port 0 monitors input port M, monitoring port 1 monitors output port M) in other test rounds, if the data comparator compares the data of the monitoring port 0 correctly, the forwarding channel of the input port M- > output port N has a fault, and the fault information is output by the controller through the serial interface;
(4) comparing test results of the ARINC818 test sequence generator- > output port X- > input port X- > output port M- > input port M (monitor port 0 monitors input port M, monitor port 1 monitors output port M) "in other rounds of tests, and if the data comparator compares the monitor port 1 data correctly but the monitor port 0 data incorrectly, the input port M or the output port M has a fault; connecting an output port M optical fiber with any input port Y with correct test, executing test "" ARINC818 test sequence generator- > output port M- > input port Y (monitor port 0 monitor input port Y) ", if the data comparator compares the data of the monitor port 0 correctly, the output port M is correct, the input port M fails, and the failure information is output by the controller through a serial interface; otherwise, the output port M fails, and the failure information is output by the controller through the serial interface;
(5) comparing test results of the ARINC818 test sequence generator- > output port X- > input port X- > output port N- > input port N (monitor port 0 monitors input port N, monitor port 1 monitors output port N) in other test rounds, if the data comparator compares the monitor port 1 data correctly but the monitor port 0 data incorrectly, the input port N or the output port N has a fault, and the fault information is output by the controller through a serial interface; connecting an optical fiber of an output port N with any input port Y with correct test, and executing test "" ARINC818 test sequence generator- > output port N- > input port Y (monitoring port 0 monitoring input port Y) ", wherein if the data comparator compares the data of the monitoring port 0 correctly, the output port N is correct, the input port N fails, and the failure information is output by the controller through a serial interface; otherwise, the output port N has faults, and fault information is output by the controller through the serial interface.
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