WO2008061413A1

WO2008061413A1 - A method, device and system for recognizing a cable type and a switching cable

Info

Publication number: WO2008061413A1
Application number: PCT/CN2007/001833
Authority: WO
Inventors: Huayu Chang
Original assignee: Huawei Technologies Co., Ltd.
Priority date: 2006-11-24
Filing date: 2007-06-11
Publication date: 2008-05-29
Also published as: CN1963547A; CN100495053C

Abstract

A method for recognizing a cable type includes the step of outputting parallelly multiplex identification signals as one analog signal through the cable wherein the multiplex identification signals are used to identify the cable type (401); converting the analog signal into a digital signal (402); matching the signal value of the digital signal with the corresponding relation between the preset digital signal value and the cable type, and recognizing the cable type or whether or not under a nonconnecting condition (403).

Description

Method, device and system for identifying cable type and adapter cable device

The present application claims priority to Chinese Patent Application No. 200610145265.6, entitled "Method, Apparatus and System for Identifying Cable Types and Adapter Cable Device", filed on November 24, 2006, the entire contents of which are hereby incorporated by reference. This is incorporated herein by reference.

Technical field

The present invention relates to cable access device technology, and more particularly to a method, apparatus and system for identifying cable types and adapter cable devices.

Background technique

In data communication products, it is often the case that a single board hardware interface is used to support different interface standards. For example, a Synchronous/Asynchronous serial interface can support RS-232, RS-449, EIA-530, The level of the serial communication interface standard such as EIA-530-A, V.35 and X.21 is suitable for the corresponding transmission rate and transmission distance. In order to simplify the interface design, it is common to set the TTL (Transistor-Transistor Logic) level to the corresponding interface level by identifying different types of cables during level shifting of the interface. TTL logic levels are converted between levels including, but not limited to, the above serial communication interface standards.

An existing technique for identifying a cable is to select four pins in the cable plug, and the four pins identify the ID signal by four signals, and the four signals are respectively named: ID-3, ID-2, ID- 1 and ID — 0, the signals of the four pins are connected to the power supply through the pull-up resistors on the board. When there is a cable connection, different cables are grounded or suspended by the four identification ID signals, thus identifying the ID signal. Different levels are combined. One level combination corresponds to one type of cable. The corresponding relationship between the specific ID signal and cable type is shown in Table 1, where EIA-530, EIA-530A, RS-232, RS-449 V.35 and V.21 are interface standards for serial communication; DCE (Data Communicate Equipment) is a data communication device, and DTE (Data Terminal Equipment) is a data terminal device.

Table 1, cable model and ID - X relationship table

Serial Number ID— 3 ID— 2 ID— 1 ID— 0 Corresponding cable type

1 0 0 0 0 not used

2 0 0 0 1 EIA-530A DTE mode cable

3 0 0 1 0 EIA-530 DTE mode cable 4 0 0 1 1 X.21 DTE mode cable

5 0 1 0 0 V.35 DTE mode cable

6 0 1 0 1 RS-449 DTE mode cable

7 0 1 1 0 RS-232 DTE mode cable

8 0 1 1 1 No cable

9 1 0 0 0 not used

10 1 0 0 1 EIA-530A DCE mode cable

11 1 0 1 0 EIA-530 DCE mode cable

12 1 0 1 1 X.21 DCE mode cable

13 1 1 0 0 V.35 DCE mode cable

14 1 1 0 1 RS-449 DCE mode cable

15 1 1 1 0 RS-232 DCE mode cable

16 1 1 1 1 No cable

As can be seen from Table 1, 12 cables can be identified when occupying four pins, and there are four cases of no cable and no use. However, the number of pins (pins) of a connector connected to a cable on a single board is limited, and the standard signal for serial communication cannot be lacking. When four or eight such interfaces appear on a single board, the cable is identified. When the number of pins required on the board is 16 or 32, it is difficult to implement on the limited single-board cable connector pins, which may result in insufficient pins of the cable connector on the board. Only four identification signals are listed. If there are more identification signals and one identification signal occupies one pin, it will lead to more cable connector pins.

Summary of the invention

An embodiment of the present invention provides a method, device, and system for identifying a cable type to reduce the occupation of a cable connector pin on a single board when the cable is identified.

Another aspect of an embodiment of the present invention further provides an adapter cable device,

The embodiments of the present invention provide the following technical solutions:

A method of identifying a cable type, including:

Parallel output of the multi-channel identification signal output by the cable for identifying the cable type as an analog signal Converting the analog signal to a digital signal;

A matching of the signal value of the digital signal with a preset digital signal value and a cable type is performed to identify the cable type.

The method of the embodiment of the present invention converts the multi-channel identification signal into a single-board analog signal through a parallel circuit, so that only one pin needs to be occupied on the single board, and only one pin needs to be occupied regardless of several identification signals. It not only reduces the use of a limited number of pins on the cable connectors on the board, but also identifies more cable types without occupying the pins, and also recognizes the connectionless state, which can further satisfy the customer. Need.

An adapter cable device for connecting a standard cable and cable identification device, including:

a first cable interface for connecting to a standard cable, receiving a multi-channel identification signal transmitted by the standard cable for identifying a cable type;

a first adapter cable, configured to synthesize the multi-channel identification signal into an analog signal;

And a first cable identification device interface for transmitting the analog signal output by the first adapter cable to the cable identification device.

With the adapter cable device provided by the embodiment of the present invention, a standard cable can be connected to the cable identification device, so that the cable identification device recognizes the type of the standard cable. The adapter cable device only needs to combine the multi-channel identification signals of the identification cable type, and does not need to change the original cable plug or the socket, and the adapter cable device does not change the data service signal, so the data transmission and reception will not be affected. Signal transmission.

A device for identifying a cable type, comprising:

a pull-up resistor connected to the pull-up power source for obtaining an analog signal outputted by the adapter cable device; an analog-to-digital converter unit for converting the analog signal into a digital signal and obtaining a signal value of the digital signal The signal value uniquely corresponds to a cable type.

A system for identifying cable types, including:

a patch cable device for connecting to a standard cable, and synthesizing the multi-channel identification signal of the standard cable type uniquely sent by the standard cable into an analog signal;

A device for identifying a cable type for converting an analog signal transmitted by the adapter cable device into a digital signal corresponding to a cable type.

The above technical solution shows that the device and the system of the embodiment of the present invention input the analog signal of the multi-channel identification signal into the single board through the parallel circuit, so that only the single-board cable connector is needed. It occupies one pin, and only needs to occupy one pin for several identification signals, which not only reduces the occupation of a limited number of pins of the cable connector on the single board, but also recognizes the pin without occupying the pin. More cable types, as well as a connection-free status, can further meet customer needs.

DRAWINGS

1 is a structural view of an adapter cable device according to an embodiment of the present invention;

2 is a structural diagram of an apparatus for identifying a cable type according to an embodiment of the present invention;

Figure 3 is a structural diagram of a system for identifying a cable type according to an embodiment of the present invention;

4 is a flow chart of a method in accordance with an embodiment of the present invention.

detailed description

The embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

Referring to FIG. 1, FIG. 1 is a structural diagram of an adapter cable device according to an embodiment of the present invention. As shown in FIG. 1, the adapter cable device is mainly composed of three parts:

a first cable interface 101, configured to be connected to a standard cable (not shown) for receiving a multi-channel identification signal for identifying a cable type transmitted by the standard cable;

The signal is not changed by the cable interface. The cable interface can be a socket, a plug, or other connection interface. The specific interface is different depending on the specific usage environment. The specific type is defined as long as the complete reception of the signal of the standard cable is within the scope of the present invention. Even when there is no cable connection, there is no signal transmitted by the standard cable, but in fact there is still a signal in the circuit. For example, one end of the standard cable is grounded through a switch, and the other end is connected to a power supply through a pull-up resistor. When the switch is off, it means that there is no cable connection. At this time, the signal obtained on the first cable interface is the power signal (that is, the voltage value of the power source is obtained).

The first adapter cable 102 includes a parallel circuit having the same number of lines as the number of signals of the multiple identification signals, and is configured to synthesize the multiple identification signals by using parallel resistors preset on respective lines of the parallel circuit. One way analog signal;

The parallel circuit consists of n signal lines, each of which has a corresponding resistance. For the convenience of description, the parallel resistance on line one is, and the parallel resistance on line 2 is R ₂ , ..., the line The parallel resistance on N is R _n , and each identification signal is synthesized into one analog signal after passing through each parallel resistance; The number of signal lines is also determined by the specific use environment, which is determined by the number of cable types that need to be identified. For example, in the prior art, it is necessary to identify 12 types of cables, and four signal lines are required; the value of the resistance on the signal lines You can take the value at will. Of course, the higher the accuracy of the resistor, the better. In practice, for the convenience, the scheme of the relevant multiple is generally adopted, such as =2*=4*=8*, etc. Of course, this is just an example. Any value does not affect the implementation of the embodiment of the present invention. Therefore, the embodiment of the present invention does not limit the value of each resistor. a first cable identification device interface 103, configured to be connected to the cable identification device, to transmit the one analog signal processed by the adapter cable to a device for identifying the cable type (not shown);

As with the cable interface, the cable identification device interface can also be any of a socket, plug or other interface;

The first cable identification device interface 103 is different from the first cable interface 101 in that only one of the identification signals needs to be input to the cable identification device after the first identification cable 102 synthesizes the multiple identification signals, so that the adapter cable device The identification signal is synthesized and input to the cable identification device. Since the original multi-channel identification signal has only one way, the identification signal only occupies one pin on the board, and no matter how many pins are occupied by the original identification signal, After the cable unit is connected, there is only one board pin, which greatly improves the utilization of the pins on the board and saves the pins on the board.

Of course, in order to ensure the smooth running of the communication, the functional entities of the adapter cable device can also add the following functional units:

a second cable interface for receiving a service data signal transmitted by the standard cable; the second cable interface may be integrated with the first cable interface or may be separated;

a second adapter cable for receiving and transmitting the service data signal to the second cable identification device interface; likewise, the second adapter cable may be integrated or separated from the first adapter cable;

A second cable identification device interface for transmitting the service data signal to a device identifying the cable type.

The second cable identification device interface can also be integrated with the first cable identification device interface or can be separated.

Because the patch cable device does not require any changes to the business data, it only plays a role in forwarding the traffic data. Further, in order to ensure the accuracy of the cable type identification, the resistance values of the parallel resistors on the respective lines of the parallel circuit built in the adapter cable are different from each other, so that the equivalent resistance of the parallel circuit can be ensured under different conditions. It is unique; of course, the resistance values of the parallel resistors are not the same or different, which is determined by the number of cable types to be identified; for example, two identification signals are combined to form an analog signal, if two identification signals need to be identified 4 For different types of cables, the resistance values need to be different from each other; but if only three, or two, or one type of cables need to be identified, the resistances of the resistors on the two lines of the parallel circuit can be the same. Since there are four combinations of states in which two resistors are connected in parallel, if the resistance values of the resistors are the same, only two of the combinations are the same, and actually there are three equivalent resistance values, so when identifying no more than 3 cables When the resistance values of the individual resistors do not need to be different, the same resistance value can correctly identify the cable type; The resistance value of the parallel resistance different from each other using a case will be described. Because the identification of the board is changed, in order to correctly identify the cable, some improvements are required to the board. First, the interface on the board is modified, and then the cable can be identified. The following describes the embodiment of the present invention. A device for identifying a cable type, as shown in FIG. 2, mainly includes: a pull-up resistor 201, an analog-to-digital converter unit 202, and a signal value matching unit 203.

The pull-up resistor 201 is configured to pull up the parallel circuit in the adapter cable device to the pull-up power source to obtain an analog signal output by the parallel circuit;

The pull-up resistor 201 is connected with a pull-up power supply, and an analog signal transmitted by the adapter cable reaches the board, and is pulled up to the power source through the pull-up resistor 201. At this time, the pull-up resistor 201 and the parallel resistor in the adapter cable are formed. a series resistor; the resistance value of the pull-up resistor 201, the voltage value of the pull-up power supply, and the resistance value r of each parallel resistor in FIG. 1 are known, so that the voltage value of the analog signal is measured. It can be calculated which lines of the identification signal are disconnected, that is, which lines are not signaled; and the voltages corresponding to the combination of each identification signal are different, so that the relationship of the identification signal combination corresponding to a signal value is preset. The table can know the corresponding identification signal combination by the signal value, and the cable type corresponding to each identification signal combination is also known, so the cable type corresponding to the signal value can be easily obtained;

The analog to digital converter unit 202 is configured to convert the analog signal into a digital signal to obtain a signal value of the digital signal, the signal value uniquely corresponding to a cable type.

Because the interval between the individual analog signal values obtained above is not very large, as described above, _r / The value of (R+r) is greater than 0 and less than or equal to 1, and each circuit component itself is also errory. In order to ensure the correctness of the identification, the above signal value can be amplified by the A/D converter. For example, using an 8-bit A/D converter, the value will be between 0 and 255. Similarly, if a 10 bit A/D converter is used, the value will be between 0 and 1023, so that between the values of the analog signals The interval is increased to separate the individual signal values to ensure accuracy in cable type identification.

Further, since the board is a digital signal, the device part for identifying the cable type provided by the embodiment of the present invention can only recognize the digital signal, so the analog signal is converted into a digital signal, so that the signal values are not overlapped. , also makes the signal easy to recognize, thereby performing the corresponding operation.

Based on the signal value of the digital signal output from the analog-to-digital converter unit 202, the cable type corresponding to the signal value can be determined. For example, a correspondence table of digital signal values and cable types is set in advance, and the cable type is obtained by manually finding the relationship table.

Of course, the signal value matching unit 203 may be further disposed in the device, configured to match the signal value of the digital signal with a preset digital signal value and a correspondence table of the cable, and identify the cable type or the connectionless state. Thus, the cable type is automatically obtained by the device.

As mentioned above, the final digital signal values obtained are different according to different combinations of resistors and different A/D converters, but in the case where the combination of resistors is determined and the A/D converter determines the signal value. It is indeed finalized, so it is possible to determine the corresponding identification signal combination based on the obtained digital signal value, thereby determining the cable type.

It can be seen from the above that the adapter cable device and the device for identifying the cable type provided by the embodiments of the present invention can make the identification signal occupy only one pin on the single board to accurately identify the type of the cable or be connected. The state reduces the occupation of a limited number of pins on the board and improves the utilization of the board pins.

As shown in FIG. 3, it is a structural diagram of a system for identifying a cable type according to an embodiment of the present invention, and the system mainly includes:

The adapter cable device 301 is configured to be connected to a standard cable (not shown), and synthesize the multi-channel identification signal sent by the standard cable to identify the standard cable type into an analog signal; wherein 11, 12 In represents an n-way identification signal line, and each identification signal line corresponds to one identification signal; The device 302 for identifying a cable is configured to convert an analog signal sent by the adapter cable device 301 into a digital signal, and match the signal value of the digital signal with a preset digital signal value and a correspondence table of the cable to identify The cable type is either disconnected.

The multi-channel identification signal is synthesized into the analog signal by a parallel circuit built in the adapter cable device 301;

The number of branches of the parallel circuit is the same as the number of signals of the multi-channel identification signal, and one identification signal corresponds to a shunt of a parallel circuit;

Of course, the multi-channel identification signals cannot be directly combined, so that parallel resistors having different resistance values are preset on each line of the parallel circuit;

After the resistors are connected in parallel, the voltage drop occurs in each signal, and the resistance values are different from each other. When different resistance values are combined, the equivalent resistance of each combination is different, and different combinations correspond to different cable types. Therefore, the correct identification of the cable type or the connectionless state is ensured; in the case of the same resistance value, as described above, although the resistance values may be the same, the equivalent resistance of each cable type is actually The value is not the same, so when the resistance value is the same, the cable type can be determined according to the last equivalent resistance of the parallel circuit or in the no connection state;

Wherein the analog signal is converted to the digital signal by an analog to digital converter;

In practical applications, in order to make the signal values of the respective digital signals different, generally adopting an analog-to-digital converter with sufficient bit width to ensure a large space between the signal values of the respective digital signals, so that each signal value There is no overlap, so that each signal value has a unique cable type.

Referring to the background art, an example of practical application is given. Four identification signals, the parallel resistances on the respective identification signal lines are respectively corresponding to IDJ ID-1, ID-2 and ID-3 in the background art, so that the ID__x is suspended. When the corresponding resistance is also suspended, the relationship between the ID_x and the cable type described in Table 1 becomes the correspondence table of the resistance Rx and the cable type described in Table 2, wherein the signal is suspended by the existing one. The corresponding switch in the cable plug determines that when a certain identification signal is empty, the corresponding switch is disconnected, and one end of the switch is grounded.

Table 2. Correspondence table between resistance combination and cable type

Serial number ID— 3 ID— 2 ID—l ID—0 Corresponding cable type

1 4 R ₃ R ₂ Ri Not used 2 R4 R ₃ R ₂ EIA-530A DTE mode cable

3 R4 R ₃ Ri EIA-530 DTE Mode Cable

4 R4 R ₃ X.21 DTE mode cable

5 R4 R ₂ Ri V.35 DTE mode cable

6 R4 R ₂ RS-449 DTE mode cable

7 R4 Ri RS-232 DTE Mode Cable

8 R4 without cable

9 R ₃ R ₂ Ri not used

10 R ₃ R ₂ EIA-530ADCE mode cable

11 R ₃ Ri EIA-530 DCE mode cable

12 R ₃ X.21 DCE mode cable

13 R ₂ Ri V.35 DCE mode cable

14 R ₂ RS-449 DCE mode cable

15 Ri RS-232 DCE mode cable

16 no cable

As can be seen from Table 2, the cable type can be determined by a combination of different parallel resistors; assuming that the resistance of the pull-up resistor is R, the resistance of the parallel circuit composed of the parallel resistor is r, according to the characteristics of the parallel circuit, in four When the resistors are connected, the resistance r of the parallel circuit is:

r = 1/((1/ R4) + (1/ R3) + (1/ R2) + (1/ R1));

In this way, according to the principle of the parallel circuit, the voltage value V of the analog signal input to the board of the adapter cable can be obtained as follows:

V=Vcc * r / ( R + r ), where Vcc is the voltage value of the pull-up power supply;

In addition, regarding the value of Rx (x=l, 2, 3, 4), in general, the values of the respective resistors are preferably different, so that each identification signal can be determined according to different situations, if there are two parallel connections If the values of the resistors are the same, there will be multiple signal values, and the true identification signal will not be recognized. This example uses the following resistance value scheme:

R4=1*R; R3=2*R; R2=4*R; R1=8*R;

Where R is the resistance value of the pull-up resistor. Of course, this is only the value scheme adopted in this example. In practical applications, their values can be arbitrary, and it is better that the resistance values of the resistors are different; Improve the accuracy of the identification cable, the accuracy of each component including the resistor and the power supply should be as high as possible, that is, the difference between the nominal value of the component and its actual value should not be too large, and the accuracy is preferably 1%. And above.

According to the value of the above parallel resistor and the signal of the 8 bit A/D converter, the combination of each parallel resistor and its corresponding cable type, and the value converted by the A/D converter and the value The corresponding hexadecimal values are shown in Table 3:

Table 3, parallel resistance combination and its signal value converted to digital signal worth correspondence table

Then, according to the converted signal value, the corresponding cable type is found in the corresponding relationship between the converted conversion result and the cable, thereby identifying the corresponding cable type. A correspondence between a preset signal value and a cable type is shown in Table 4:

Table 4, Correspondence between signal values and cable types Cable type corresponding to the serial number A/D conversion result

1 0x59±2 not used

2 0x5D±2 EIA-530A DTE mode cable

3 0x61±2 EIA-530 DTE mode cable

4 0x66士 2 X.21 DTE mode cable

5 0x6B±2 V.35 DTE mode cable

6 0x71±2 RS-449 DTE mode cable

7 0x78=1=2 RS-232 DTE mode cable

8 0x80±2 no cable

9 0x88±2 not used

10 0x92±2 EIA-530A DCE mode cable

11 0x9D±2 EIA-530 DCE mode cable

12 0xAA±2 X.21 DCE mode cable

13 0xBA±2 V.35 DCE mode cable

14 OxCC 2 RS-449 DCE mode cable

15 0xE3士 2 RS-232 DCE mode cable

16 OxFF-2 without cable

In Table 4, each signal value has a floating value of ± 2 because there is an error between the nominal value of the resistor and its actual value in practical applications, and the AD converter is also error-prone. The floating value of ± 2 can ensure the correct identification of the cable. The floating value of only the - 2 of the serial number 16 is because the maximum value converted by the 8-bit A/D converter is only OxFF, so only the floating value of - 2; The determination of the floating value is determined by the accuracy of each device. It can also be up and down. It can also be floated up and down. Of course, it can be determined by the specific use environment. Here is just a practical example. It is not true. The range of up and down float is limited.

The above is only a description of the conversion result of the 8-bit A/D converter. In practical applications, if higher precision is required, an A/D converter of 10 Bit or higher can be used. Of course, if the accuracy is high enough, an A/D converter of less than 8 bits can be used. The selection of the A/D converter is also determined according to the specific use environment, and the present invention does not have the bit of the A/D converter. The width is limited. The device and the system provided by the embodiments of the present invention are described above. The following describes the method for identifying the cable type provided by the present invention. Referring to FIG. 4, FIG. 4 is a specific flowchart of the method according to the embodiment of the present invention: Step 401: Output the cable The multi-channel identification signal for identifying the cable type is output in parallel as one analog signal;

Because there are many different cables to be identified, different cables are distinguished by different combinations of identification signals. Generally, it is necessary to identify the number of cable types according to the number of cable types to be identified. For example, to identify 10 cables, four identifiers are required. Signal, if only six types of cables need to be identified, only three identification signals are needed; specifically, how many identification signals are determined by the number of cable types that need to be identified.

Each identification signal has its own communication line. A parallel resistor is added to each communication line to form a parallel circuit, and then each signal through the parallel resistance is combined into one signal; because different cable corresponding identification signals Differently, in fact, when the cable is output, it is determined according to the identification signal which communication lines are open and which communication lines are unreachable, so that the total resistance value of the parallel combination of various parallel resistances according to the communication line is turned on and off. It will be different, so that the synthesized analog signal will vary depending on the combination of the parallel resistors.

In order to determine the resistance value of the parallel circuit, the analog signal is pulled up to the pull-up power supply through the pull-up resistor, and the pull-up resistor and the resistor of the parallel circuit form a series circuit, and the resistance value of the pull-up resistor and the voltage value of the pull-up power source It is known that, according to the characteristics of the series circuit, the voltage value or current value of the analog signal can be obtained, thereby determining the resistance value of the parallel circuit, and the resistance values of the respective parallel resistors are also known, so according to the characteristics of the parallel circuit, According to the resistance value of the parallel circuit, it can be known which parallel resistances are effective in the parallel circuit, so that it can be known which identification signals are valid.

Step 402: Convert the analog signal into a digital signal.

The difference between the signal values of the respective analog signals after step 401 is not so great, and the ratio of the resistance value of the parallel circuit above and the sum of the resistance values of the pull-up resistor and the parallel circuit ranges from 0 to 1. Therefore, it needs to be converted into a digital signal by an A/D (Analog/Digital) converter. The AI converter with different bit widths can make the free space between the analog signals larger, for example, a 6-bit A/D converter. The converted value range becomes from 0 to 63, so that different signals can be identified more accurately, ensuring the accuracy of cable type identification.

Step 403: Match a signal value of the digital signal with a preset digital signal value and a cable type to identify the cable type. Since the values of the respective circuit components are known, the signal values of the corresponding digital signals after the combination of the above processes can be predetermined according to the combination of the various parallel resistances, so that the digital signal values and cable types can be preset. In the corresponding relationship table, in the actual application, the corresponding cable type can be found in the corresponding relationship table according to the actually obtained value, thereby performing other operations; of course, in order to improve the identified quasi-nitrification rate, generally the digital signal value is The corresponding relationship between the value range and the cable type. The specific operations are described above and will not be described here.

As can be seen from the above, since only one analog signal is sent to the board, only one pin on the board needs to be occupied, which reduces the occupation of a limited number of pins on the board, especially when there are many types of cables to be identified. At this time, there are many identification signals. According to the prior art, there are several ways to use several pins for the identification signal, which is a waste of a limited number of pins on the board, and after using the method of the embodiment of the present invention, no matter how many The road identification signal only needs to occupy one pin on the board.

Of course, the method is not only applied to identify the cable type on the single board, and any technical solution that is provided by the embodiment of the present invention can be used in any solution that uses a multi-way identification signal to identify the type of the cable or even the type of the access line. The type is identified, and the specific similarity is not described in detail here.

In actual use, when the system supports a large number of cable types, for example, the number of supported cable types is the same as or close to the number of combinations of parallel resistors on the parallel circuit, each parallel resistor can take a different value, which ensures The signal value of each of the parallel resistors combined to the last digital signal is unique.

The method, the device and the system for identifying the cable type and the adapter cable device provided by the embodiments of the present invention are described in detail. The principles and implementation manners of the present invention are described in the following, and the description of the above embodiments is described. It is only used to help understand the method of the present invention and its core ideas; at the same time, for those skilled in the art, according to the idea of the present invention, there will be changes in specific embodiments and application scopes. The contents of this specification are not to be construed as limiting the invention.

Claims

Rights request

A method for identifying a cable type, comprising:

Outputting the multi-channel identification signal of the cable output for identifying the cable type in parallel as one analog signal;

Converting the analog signal to a digital signal;

2. The method of identifying a cable type according to claim 1, wherein the voltage drops of the respective lines of the multi-way identification signal are different from each other when the parallel output is an analog signal.

3. An adapter cable device for connecting a standard cable and cable identification device, comprising:

The adapter cable device according to claim 3, wherein the first adapter cable comprises: a parallel circuit composed of a plurality of parallel resistors, the number of the resistors being more than the type of the identification cable The number of road identification signals is the same.

The adapter cable device according to claim 4, wherein the resistance values of the parallel resistors are different from each other.

6. The adapter cable device of claim 3 or 4 or 5, wherein the device further comprises:

a second cable interface, configured to receive a service data signal transmitted by the standard cable;

a second adapter cable for receiving and transmitting the service data signal to the second cable identification device interface;

A second identification cable type device interface for transmitting the service data signal to a device identifying the cable type.

7. A device for identifying a cable type, comprising: a pull-up resistor connected to the pull-up power supply for obtaining an analog signal outputted by the adapter cable device; an analog-to-digital converter unit for converting the analog signal into a digital signal and obtaining a signal value of the digital signal The signal value uniquely corresponds to a cable type.

8. The device for identifying a cable type according to claim 7, wherein the device further comprises:

And a signal value matching unit configured to match a signal value of the digital signal with a preset relationship between the preset digital signal value and the cable, and identify a cable type corresponding to the signal value.

9. A system for identifying a cable type, comprising:

A system for identifying a cable type according to claim 9, wherein said switching cable device is provided with a parallel circuit, and said multi-channel identification signal is synthesized as said analog signal by said parallel circuit.

A system for identifying a cable type according to claim 10, wherein each of said parallel circuits is provided with a resistor having mutually different resistance values.

A system for identifying a cable type according to claim 9, wherein said means for identifying a cable type comprises: an analog to digital converter for converting said analog signal into said digital signal.