WO2015196754A1

WO2015196754A1 - Method, device and client terminal device for improving reliability of device having plurality of modules

Info

Publication number: WO2015196754A1
Application number: PCT/CN2014/094129
Authority: WO
Inventors: 张路
Original assignee: 中兴通讯股份有限公司
Priority date: 2014-06-27
Filing date: 2014-12-17
Publication date: 2015-12-30
Also published as: CN105306289A

Abstract

A method, device and client terminal device for improving the reliability of a device having a plurality of modules. The method comprises: a first module, according to the condition of control command interaction with a second module, determines whether a control link between the first module and the second module is abnormal; the first module sends a ping request packet to the second module, so that the second module sends a ping response packet to the first module according to the ping request packet sent by the first module; according to the condition of the received ping response packet, the first module determines whether a data link between the first module and the second module is abnormal; when it is determined that the control link and/or the data link are abnormal, the first module restarts. The described technical solution combines operating features of a device having a plurality of modules, monitors the communication reliability of the control link and the data link between the modules, not only determines problems caused by the modules themselves being abnormal, but also determines problems between the modules caused by synchronisation being abnormal, and performs recovery in a timely manner.

Description

Method, device and client terminal device for improving reliability of multi-module equipment

Technical field

The invention relates to the field of modules, in particular to a method, a device and a client terminal device for improving the reliability of a multi-module device.

Background technique

With the advancement of the times and the development of technology, today's intelligent systems are often composed of multiple modules. Single-chip single modules are difficult to handle today's highly complex product requirements. As big as smart home, the concept of "module" such as TV, refrigerator, water heater, small to mobile phone, wireless router, "module" concept is like big control board, wireless modem. It can be said that the module is the "cell" in the current intelligent system, completing a specific function, and the communication between the modules is the lifeblood of the system. From this perspective, the reliability of intelligent systems needs to be guaranteed in at least two aspects. One is the stability of "cells" and the other is the patency of "lifeline". From the point of view of smart home, both TV and refrigerator have been developed for many years. As a cell component, they have their own stability; from small wireless CPE (Customer-premises Equipment, customer terminal equipment) From the perspective, the control board for the control module and the Modem module for wireless data transmission are also relatively mature products, and the stability is also guaranteed by the respective manufacturers or chip providers. The real problem is that the reliability of "cells" is not equal to the reliability of the system. Reliableness is not equal to the combination is still reliable. The development of modern electronic products is becoming more and more complex, and more and more products are in the form of multi-module collaborative work. The reliability and synergy of the overall system are presented as a new and important issue.

Summary of the invention

The technical problem to be solved by the embodiments of the present invention is to provide a method, a device, and a client terminal device for improving the reliability of a multi-module device, which can determine the problem caused by the abnormality of the module itself, and can also determine the problem caused by the synchronization abnormality between the modules. And resume in time.

To solve the above technical problem, an embodiment of the present invention provides an improvement of reliability of a multi-module device. The multi-module device includes a first module and a second module, and the first module works in cooperation with the second module, the method includes:

Determining, by the first module, whether a control link between the first module and the second module is abnormal according to a status of interaction with a control command of the second module;

The first module sends a PING request message to the second module, so that the second module sends a PING response message to the first module according to the PING request message sent by the first module;

Determining, by the first module, whether the data link between the first module and the second module is abnormal according to the received status of the PING response packet;

The first module performs a restart when it is determined that the control link and/or the data link is abnormal.

Optionally, the method further includes:

The first module receives the PING request message sent by the second module, and sends a PING response message to the second module according to the PING request message sent by the second module.

Optionally,

The step of determining, by the first module, whether the control link between the first module and the second module is abnormal according to the interaction status with the control command of the second module includes:

During the preset time period, the first module receives the number of control commands sent from the second module that does not reach the corresponding preset experience value and/or the number of the first module sends the control command to the second module does not reach the corresponding pre-predetermined If the experience value is set, the first module determines that the control link is abnormal.

Optionally,

The step of the first module sending a PING request message to the second module includes:

The first module sends a PING request message to the second module according to a preset period;

The step of determining, by the first module, whether the data link between the first module and the second module is abnormal according to the received status of the PING response message includes:

If the first module fails to receive the PING response message corresponding to the second module, the first module determines that the data link is abnormal.

In order to solve the above technical problem, the embodiment of the present invention further provides an improved multi-module device. The first module of the multi-module device, wherein the first module cooperates with the second module of the multi-module device, the device comprises:

a first determining unit, configured to determine, according to a control command interaction status of the first module and the second module, whether a control link between the first module and the second module is abnormal;

The first sending unit is configured to send a PING request message to the second module by using the first module, so that the second module sends a PING response message to the first module according to the PING request message sent by the first module;

The first receiving unit is configured to receive, by using the first module, a PING response message sent by the second module;

a second determining unit, configured to determine, according to a status of the PING response message received by the first module, whether a data link between the first module and the second module is abnormal;

And the restarting unit is configured to restart the first module when the first determining unit determines that the control link is abnormal and/or the second determining unit determines that the data link is abnormal.

Optionally, the device further includes:

a second receiving unit, configured to receive, by using the first module, a PING request message sent by the second module;

The second sending unit is configured to: after the first module receives the PING request message sent by the second module, send the PING response message to the second module by using the first module according to the PING request message sent by the second module.

Optionally, the first determining unit is configured to:

During the preset time period, if the number of control commands sent by the first module from the second module does not reach the corresponding preset experience value and/or the number of control commands sent by the first module to the second module does not reach the corresponding The preset experience value determines that the control link is abnormal.

Optionally, the first sending unit is configured to send, by using the first module, a PING request message to the second module according to a preset period;

The second determining unit is configured to:

If the first module fails to receive the PING corresponding to the second module for a preset number of cycles In response to the message, it is determined that the data link is abnormal.

In order to solve the above technical problem, an embodiment of the present invention further provides a client terminal device, including: a control board and a debug demodulator module; the control board and the debug demodulator module each include the apparatus as described above.

The beneficial effects of the above technical solutions of the embodiments of the present invention are as follows:

The solution of the embodiment of the present invention combines the working characteristics of the multi-module device, monitors the control link between the modules, and the communication reliability of the data link, and can not only determine the problem caused by the abnormality of the module itself, but also effectively determine the inter-module relationship. Synchronization caused by anomalies and timely recovery. In addition, the method of the embodiment of the present invention uses the relevant control command to detect the control link, and since it is not necessary to introduce a new command, the implementation is more convenient.

BRIEF abstract

1 is a schematic diagram of steps of a method for improving reliability of a multi-module device according to an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of an apparatus for improving reliability of a multi-module device according to an embodiment of the present invention.

Preferred embodiment of the invention

The technical problems, the technical solutions, and the advantages of the embodiments of the present invention will be more clearly described in the following description.

A method for improving the reliability of a multi-module device, the multi-module device includes a first module and a second module, and the first module and the second module work together, as shown in FIG. 1 , the method includes:

Step 11: The first module determines, according to the interaction status with the control command of the second module, whether the control link between the first module and the second module is abnormal.

Step 12: The first module sends a PING request message to the second module, so that the second module sends a PING response message to the first module according to the PING request message sent by the first module.

Step 13: The first module determines, according to the received status of the PING response message, whether the data link between the first module and the second module is abnormal.

Step 14: When it is determined that the control link and/or the data link is abnormal, the first module performs a restart.

The method of the embodiment of the invention combines the working characteristics of the multi-module device, monitors the control link between the modules and the communication reliability of the data link, and timely repairs the problem caused by the abnormality of the module itself or the synchronization abnormality between the modules. . After the first module in the above embodiment is restarted, the control link is restarted, the data link is reset, and the link abnormality is also repaired. In addition, the method of the embodiment of the present invention uses the relevant control command to detect the control link, and since it is not necessary to introduce a new command, the implementation is more convenient.

In addition, based on the foregoing embodiment, the method of the embodiment of the present invention further includes:

Step 15: The first module receives the PING request message sent by the second module, and sends a PING response message to the second module according to the PING request message sent by the second module.

It can be known from the description of the step 15 that the first module and the second module of the embodiment of the present invention have the same function, that is, a two-way detection mechanism is implemented between the first module and the second module, and Restart immediately to ensure stability between modules and recovery of abnormal conditions.

Optionally, in the foregoing step 11, in the preset time period, the first module receives the number of control commands sent from the second module does not reach the corresponding preset experience value, and/or the first module sends the second module to the second module. If the number of control commands does not reach the corresponding preset experience value, the first module determines that the control link is abnormal.

Steps

11 and 14 are described in detail below in conjunction with an exemplary implementation.

In this implementation manner, by setting a soft watchdog to monitor a control command between the first module and the second module, the abnormal detection of the control link by the first module is implemented, and the steps are as follows:

Step 201: After the system of the multi-module device is started, the first module first checks the running environment (ie, Runtime Validation, runtime verification). Optionally, in this step, the version information of the first module and whether the first module is in an abnormal working state (such as update, maintenance) are checked. The result will determine if the watchdog of the first module is up. Step 202 is performed after the test passes (latest version, normal working state).

Step 202: Create a soft watchdog timer; the timer time can be set according to experience, such as 5 Minutes, or 10 minutes.

Step 203: The first module sends a control command to the second module, and the watchdog variable S1 is incremented by one;

Step 204: The first module receives a control command from the second module, and the watchdog variable S2 is incremented by one;

Step 205: After the timer expires, the first module performs a validity check of the S1 and S2 variables; this step is to prevent an event similar to the update and upgrade of the first module during the execution of the step 202 to the step 205, resulting in an event The detection of the control link is meaningless.

Step 206: Determine the two variables S1 and S2, if both are greater than 0 (0 is the empirical value), step 207 is performed; if there is a variable equal to 0, step 208 is performed;

Step 207: Clear the S1 and S2 variables, and then return to step 203;

Step 208: The first module takes an action such as restarting.

Optionally, in the foregoing step 12, the first module sends a PING request message to the second module according to the preset period; and in step 13, if the first module fails to receive the second consecutive number of cycles The module corresponds to the sent PING response message, and the first module determines that the data link is abnormal.

Steps 12 through 14 are described in detail below in conjunction with an exemplary implementation.

In this implementation manner, by setting a soft watchdog to monitor the PING message between the first module and the second module, the abnormal detection of the data link by the first module is implemented, and the steps are as follows:

Step 301: The first module starts the soft watchdog timer T1, and the timer timeout time is 30 seconds; when the timer is turned on, it enters a preset period of 30 seconds.

Step 302: The first module sends a PING request message.

Step 303: Determine the condition. If T1 times out and does not receive the ping response packet sent by the second module, execute 304. If the ping response packet sent by the second module is received in T1, go to step 308.

Step 304: The PING response packet is not received in the current cycle, the variable M1 is accumulated, the T1 is reset, the following period is entered, and the ping request message is continuously sent, and step 303 is performed; if the step 308 is received, if the T1 is timed out, the packet is still not received. Go to the ping response packet sent by the second module, and go to step 305.

Step 305: reset T1, accumulate variable M1; variable M1 records the number of occurrences of the abnormality, In the data link detection, the PING packet is not detected every 30 seconds, which is regarded as an exception.

Step 306: Determine whether the variable M1 is greater than or equal to 3; if the value is greater than 3, the tolerance value is reached, and step 307 is performed; less than or equal to 3, and the next step 303 is continued to the next timer timeout processing.

Step 307: The first module initiates a restart.

Step 308: Reset T1 and variable M1, and then return to step 302.

Of course, as an alternative, the preset cycle time T1 can be dynamically set according to the degree of channel congestion of the data link. If the load between the two modules is high, the value of T1 will be set higher, and the frequency of sending PING request messages will be reduced appropriately. In addition, the embodiment can be further extended. For example, the number of times that the PING packet is not detected can be modified, and the response of the data link is determined according to the time when the first module receives the PING response packet, thereby determining the congestion degree of the link. The system load of the second module is reflected to some extent.

In summary, the solution simultaneously diagnoses both the control link and the data link. And there are diagnostic mechanisms on both sides of the module, any module runs away, the system can be normally perceived, and the system reliability can be improved to a very high degree.

In addition, an embodiment of the present invention further provides an apparatus for improving reliability of a multi-module device, where the first module cooperates with a second module of the multi-module device, As shown in FIG. 2, the device includes:

Restarting the unit, configured to: when the first determining unit determines that the control link is abnormal and/or second When the determining unit determines that the data link is abnormal, the first module is restarted.

The device of the embodiment of the invention combines the working characteristics of the multi-module device, monitors the control link between the modules and the communication reliability of the data link, and can not only determine the problem caused by the abnormality of the module itself, but also effectively determine the inter-module relationship. Synchronous problems caused by synchronization and recovery in a timely manner. In addition, the method of the embodiment of the present invention uses the relevant control command to detect the control link, and since it is not necessary to introduce a new command, the implementation is more convenient.

Optionally, on the basis of the foregoing embodiment, the apparatus of the embodiment of the present invention further includes:

The first module of the embodiment of the present invention is the same as the second module, and can detect the data link and the control link in both directions.

Optionally, based on the foregoing embodiment, the first determining unit is configured to:

Optionally, on the basis of the foregoing embodiment, the first sending unit sends a PING request message to the second module by using the first module according to a preset period;

The second determining unit is configured to:

If the first module fails to receive the PING response packet sent by the second module for a preset number of cycles, the data link is determined to be abnormal.

The device of this embodiment corresponds to the method for improving the reliability of the multi-module device according to the embodiment of the present invention, and the device can achieve the technical effect achieved by the method.

In addition, another embodiment of the present invention further provides a client terminal device CPE, including: a control board and a debug demodulator Modem module; wherein the control board and the debug demodulator module are both included The above apparatus for improving the reliability of a multi-module device is included.

CPE's control board (CPE Board) mainly contains components such as graphical user interface (GUI), router (Router), wifi, etc. It plays the control function and is also the most closely connected part of CPE machine and user. Regardless of whether the network is disconnected from the network, the control board notifies the Modem module to initiate. The Modem module plays the role of a traditional data card. It mainly contains components such as a wireless protocol stack, interacts with the network, and transparently transmits IP packets between the control board and the network. Between the control board and the Modem module, there will be a control link and a data link, the former transmitting control messages, such as signal strength, networking parameter setting information, etc.; the data link transmits the user IP packet.

Since the control board and the Modem module are equipped with the device for improving the reliability of the multi-module device according to the embodiment of the present invention, both the control board and the Modem module can detect the control link and the data link anomaly.

Optionally, for the features of the CPE, the embodiment of the present invention improves on the restart strategy:

Controlling the debug demodulator module to restart when the control board determines that the control link between the demodulator module and the debug demodulator module is abnormal;

After the debug demodulator module is restarted, if the control board still determines that the control link is abnormal, the control board first controls the debug demodulator module to restart, and then the control board restarts;

When the control board determines that the data link between it and the debug demodulator module is abnormal, the control board re- dials;

After the redialing, if the control board determines that the data link is abnormal, the control board first controls the debug demodulator module to restart, and then the control board restarts.

The client terminal device CPE will be described in detail below with reference to the embodiments.

In the first embodiment, the CPE control board interacts with the Modem module through the AT command, and the control board controls the control link detection sub-process, including the following steps:

Step 401: After the CPE system is started, the control board first checks the running environment (ie, Runtime Validation, runtime verification). In this step, check the version information of the control board and whether the control board and the Modem module are in an abnormal working state (for example, the Modem module is in the process of restarting. For abnormal working conditions). The result will determine if the AT watchdog of the control board is activated. Step 402 is performed after the verification passes (latest version, normal working state).

Step 402: Create a timer for the AT watchdog.

Step 403: The control board sends an AT command to the Modem module, and the watchdog variable S1 is incremented by one.

Step 404: Each time the control board receives an AT command from the Modem module, the watchdog variable S2 is incremented by one.

Step 405: After the timer expires, the first module performs a validity check of the S1 and S2 variables.

Step 406: Determine the S1 and S2 variables, if both are greater than zero, proceed to step 407; if there is a variable equal to 0, proceed to step 408.

Step 407: Clear the accumulated variables S1 and S2, and then return to step 403.

Step 408: Determine whether the variable S3 is 1; the variable S3 is used to determine whether the control panel is restarted; if yes, proceed to step 409; otherwise, proceed to step 410.

Step 409: The control board sends a restart notification to the Modem module to restart the Modem module, and then the control board restarts.

Step 410: The control board sends a restart notification to the Modem module to restart the Modem module, and adds 1 to the variable S3 to make S3=1, and then returns to step 401.

In the first embodiment, the control board of the CPE has a cooperative working relationship with multiple modules. Therefore, in order to not affect the user experience, after the control board determines that the control link is abnormal, the Modem module is controlled to restart, and if the problem still cannot be solved. Then, the control board and the Modem module are restarted at the same time.

Of course, for the Modem module side detection control link, multiple threads can be used to implement. Exemplarily, a thread starts the AT watchdog timer and performs runtime judgment; a thread mainly performs an operation after a timer expires, determines a cumulative number of ATs, performs a restart, and the like, and the like; Above the function, only the statistics function. The three threads cooperate with each other to record and judge the number of AT commands simply and effectively. It should be noted that the principle of the detection control link of the Modem module side is the same as that of the control board, and therefore will not be described again.

In the second embodiment, the control board periodically sends a PING request message, and sends a PING V4 or PING V6 command according to the dial profile status. Its destination address is a dedicated IP address. example For example, the destination address of the PING V4 instruction is 169.254.xx.xx, and the destination address of the PING V6 instruction is 2090::xxxx. After receiving the message, the Modem module will not attempt to send to the network, but directly assemble a PING response message to the control board. Optionally, the Modem module exchanges its source and destination IPV4 addresses for the PING V4 request message, recalculates the IP header checksum, and sets the ICMP Type (Control Message Protocol Type) to the RSP response to obtain the PING response message. For the PING V6 request packet, the Modem module exchanges its source and destination IPV6 addresses, recalculates the ICMPv6 checksum, and sets the ICMP Type to 0x81 (that is, sets the RSP response).

Optionally, the control board detects the sub-flow of the data link, and includes the following steps:

Step 501: The control board initiates dialing, and after the dialing succeeds, the record N1 is connected.

Step 502: The control board starts the timer T1, and the timer timeout time is 30 seconds.

Step 503: The control board sends a PING request message to the Modem module.

Step 504: Determine the condition. If T1 is timed out, the networked state N1 is still connected, then step 505 is performed; if T1 is timed out, the networked state N1 is not connected, and step 510 is performed. Where N1 is used to determine validity.

Step 505: If the control board does not receive the PING response packet sent by the Modem module, reset T1, accumulate M1, perform step 506; if yes, proceed to step 510;

Step 506: Determine whether the variable M1 is greater than or equal to 3, greater than 3, that is, reach the tolerance value, if yes, proceed to step 507; if less than or equal to 3, proceed to step 504 to continue the next timer timeout processing;

Step 507: Determine whether the variable S4 is 1, the variable records whether the dialing should be re-initiated or restarted; if S4 is not 1, then go to step 509 to initiate redialing; if S4 is 1, proceed to step 508.

Step 508: The control board restarts, returning to step 502;

In step 509, the control panel redials and adds 1 to S4 to make S4=1, and then returns to step 502.

Step 510, resetting T1 and M1, and then returning to step 503.

In the second embodiment, the control board sends a PING request message to the module after the networking is successful. If it is IPv4 dialing, there will be a destination address such as PING169.254.11.11. If it is IPv6, there will be a destination address such as PING2090::1111. Both destination addresses are agreed with the Modem module. The control panel allows three times to receive PING response messages. If more than 3 times The data link is considered abnormal. After the exception, it will try to initiate a redial. If it still does not recover, it will initiate a restart. Since the data link anomaly does not affect the control link, dialing can be re-initiated. The purpose of this design is to minimize user perception.

The process of detecting the data link on the Modem module side is triggered by receiving the first PING request message. The PING request packet detected by the data link can be filtered according to the length of the PING packet and the agreed destination address. If it is a regular PING package, it will be directly transmitted to the network. If the PING packet is detected by the data link, the source and destination IP addresses of the PING packet are exchanged, and the IPv4 packet first check (for ICMPv6 checksum for IPv6) is recalculated, and then sent back to the control board. .

As an alternative, the PING request message sent by the control board can be directly regarded as the PING response message sent by the modem from the control board. On one hand, the modem module sends back a response. On one hand, it counts the number of received PING request packets. If no PING request packet is received within the period, it determines that the cycle is abnormal. When the number of abnormalities reaches the threshold, a restart will be triggered. It should be noted that the principle of detecting the data link on the side of the modem module is basically the same as that of the control board, and is not described herein again.

One of ordinary skill in the art will appreciate that all or a portion of the steps of the above-described embodiments can be implemented using a computer program flow, which can be stored in a computer readable storage medium, such as on a corresponding hardware platform (eg, The system, device, device, device, etc. are executed, and when executed, include one or a combination of the steps of the method embodiments.

Alternatively, all or part of the steps of the above embodiments may also be implemented by using an integrated circuit. These steps may be separately fabricated into individual integrated circuit modules, or multiple modules or steps may be fabricated into a single integrated circuit module. achieve. Thus, the invention is not limited to any specific combination of hardware and software.

The devices/function modules/functional units in the above embodiments may be implemented by a general-purpose computing device, which may be centralized on a single computing device or distributed over a network of multiple computing devices.

When each device/function module/functional unit in the above embodiment is implemented in the form of a software function module and sold or used as a stand-alone product, it can be stored in a computer readable storage medium. The above mentioned computer readable storage medium may be a read only memory, a magnetic disk or an optical disk or the like.

Industrial applicability

The above technical solution combines the working characteristics of the multi-module device, monitors the control link between the modules and the communication reliability of the data link, and can not only determine the problem caused by the abnormality of the module itself, but also effectively determine the synchronization problem between the modules. Anomalies and timely recovery. In addition, the above technical solution uses the relevant control commands to detect the control link, and since it is not necessary to introduce a new command, it is more convenient to implement.

Claims

A method for improving the reliability of a multi-module device, the multi-module device comprising a first module and a second module, and the first module and the second module work together, the method comprising:

Determining, by the first module, whether a control link between the first module and the second module is abnormal according to a status of interaction with a control command of the second module;

The first module sends a PING request message to the second module, so that the second module sends a PING response message to the first module according to the PING request message sent by the first module;

Determining, by the first module, whether the data link between the first module and the second module is abnormal according to the received status of the PING response packet;

The first module performs a restart when it is determined that the control link and/or the data link is abnormal.
The method of claim 1 further comprising:

The first module receives the PING request message sent by the second module, and sends a PING response message to the second module according to the PING request message sent by the second module.
The method of claim 1 wherein

The step of determining, by the first module, whether the control link between the first module and the second module is abnormal according to the interaction status with the control command of the second module includes:

During the preset time period, the first module receives the number of control commands sent from the second module that does not reach the corresponding preset experience value and/or the number of the first module sends the control command to the second module does not reach the corresponding pre-predetermined If the experience value is set, the first module determines that the control link is abnormal.
The method of claim 1 wherein

The step of the first module sending a PING request message to the second module includes:

The first module sends a PING request message to the second module according to a preset period;

The step of determining, by the first module, whether the data link between the first module and the second module is abnormal according to the received status of the PING response message includes:

If the first module fails to receive the PING response message corresponding to the second module, the first module determines that the data link is abnormal.
An apparatus for improving the reliability of a multi-module device is applied to a first module of a multi-module device, wherein the first module cooperates with a second module of the multi-module device, and the device includes:

a first determining unit, configured to determine, according to a control command interaction status of the first module and the second module, whether a control link between the first module and the second module is abnormal;

The first sending unit is configured to send a PING request message to the second module by using the first module, so that the second module sends a PING response message to the first module according to the PING request message sent by the first module;

The first receiving unit is configured to receive, by using the first module, a PING response message sent by the second module;

a second determining unit, configured to determine, according to a status of the PING response message received by the first module, whether a data link between the first module and the second module is abnormal;

And the restarting unit is configured to restart the first module when the first determining unit determines that the control link is abnormal and/or the second determining unit determines that the data link is abnormal.
The apparatus of claim 5 further comprising:

a second receiving unit, configured to receive, by using the first module, a PING request message sent by the second module;

The second sending unit is configured to: after the first module receives the PING request message sent by the second module, send the PING response message to the second module by using the first module according to the PING request message sent by the second module.
The apparatus according to claim 5, wherein said first determining unit is configured to:

During the preset time period, if the number of control commands sent by the first module from the second module does not reach the corresponding preset experience value and/or the number of control commands sent by the first module to the second module does not reach the corresponding The preset experience value determines that the control link is abnormal.
The device according to claim 5, wherein the first sending unit is configured to send a PING request message to the second module by using the first module according to a preset period;

The second determining unit is configured to:

If the first module fails to receive the PING response packet sent by the second module for a preset number of cycles, the data link is determined to be abnormal.
A client terminal device comprising: a control board and a debug demodulator module; the control board and the debug demodulator module each comprising the apparatus of any of claims 5-8.