CN116647478A - Vehicle-mounted Ethernet test system - Google Patents
Vehicle-mounted Ethernet test system Download PDFInfo
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- CN116647478A CN116647478A CN202310719414.9A CN202310719414A CN116647478A CN 116647478 A CN116647478 A CN 116647478A CN 202310719414 A CN202310719414 A CN 202310719414A CN 116647478 A CN116647478 A CN 116647478A
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- connector
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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
- H04L43/50—Testing arrangements
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Environmental & Geological Engineering (AREA)
- Small-Scale Networks (AREA)
Abstract
The invention provides a vehicle-mounted Ethernet test system, wherein a first connector is connected with an Ethernet interface of test equipment; a plurality of second connectors with different types are connected with Ethernet interfaces of the corresponding tested equipment; the first conversion module converts the differential signal transmitted by the first connector into a single-ended signal; a second conversion module; the single-ended signal is converted into a differential signal and then transmitted to the second connector; the link selection module selects one of the second connectors to be conducted with the first connector so as to realize single-ended signal transmission; the signal attenuation module sets the attenuation of the single-ended signal converted by the first conversion module. The compatibility problem among different types of equipment is solved, and meanwhile, the signal attenuation module realizes network performance test under different scenes by setting attenuation.
Description
Technical Field
The invention relates to the technical field of vehicle-mounted network testing, in particular to a vehicle-mounted Ethernet testing system.
Background
Compared with the traditional Ethernet, the vehicle-mounted Ethernet needs to use 1 pair of twisted pair wires, while the traditional Ethernet needs a plurality of pairs of twisted pair wires, and the wire harness is more. Meanwhile, the conventional Ethernet is generally connected by using an RJ45 connector, the vehicle-mounted Ethernet is not assigned with a specific connector, the connection mode is flexible and small, and the weight of a wire harness can be reduced. While increasing design flexibility, serious compatibility issues between the on-board ethernet interfaces arise. For chip development test and chip suppliers, the compatibility and matching problems between Ethernet interfaces of different devices must be solved effectively, signal transmission is unobstructed, signal transmission quality between different cable manufacturers is ensured, and performance indexes between different devices meet design expectations.
Disclosure of Invention
Based on the problems, the invention provides a vehicle-mounted Ethernet test system which can solve the problems of communication and compatibility matching of different vehicle-mounted network interfaces.
An in-vehicle ethernet testing system, comprising:
a first connector for connecting to an ethernet interface of the test device;
the second connectors are of different types and are used for being respectively connected with the Ethernet interfaces of the corresponding tested equipment;
the first conversion module is connected with the first connector through a differential signal wire and is used for converting differential signals transmitted by the first connector into single-ended signals;
a second conversion module; the single-ended signals are converted into differential signals and then transmitted to the second connectors;
the link selection module is arranged between the first conversion module and the second conversion module and is used for selecting one of the second connectors to be conducted with the first connector so as to realize single-ended signal transmission;
the signal attenuation module is connected between the first conversion module and the link selection module and is used for setting the attenuation of the single-ended signal converted by the first conversion module.
Further, the method further comprises the following steps:
a signal generator for generating an interference signal;
the power synthesizer is connected with the signal generator and is arranged between the first conversion module and the signal attenuation module, and is used for superposing the interference signal on the single-ended signal converted by the first conversion module.
Further, the method further comprises the following steps:
the first conversion module is a balance to unbalance generator.
Further, the method further comprises the following steps:
the second conversion module is a balance to unbalance generator.
Further, the link selection module is a single pole, multi throw switch.
Further, the single-pole multi-throw switch is a single-pole multi-throw radio frequency switch.
Further, the first connector is of the type H-MTD connector.
Further, the type of second connector includes at least two of the following: H-MTD connector, mini50 connector, mateNet connector, TBD connector.
The beneficial technical effects of the invention are as follows: one of the tested Ethernet interfaces is communicated with the test equipment through the link selection module to perform Ethernet performance test, differential signals are converted into single-ended signal transmission through the first conversion module and the second conversion module and then restored into differential information, the intercommunication among different equipment is realized, the compatibility problem among different types of equipment is solved, and meanwhile, the signal attenuation module realizes network performance test under different scenes by setting attenuation.
Drawings
Fig. 1 is a schematic structural diagram of a vehicle-mounted ethernet testing system according to the present invention.
Wherein,,
1-a first connector;
2-a first conversion module;
3-a second connector;
4-a second conversion module;
a 5-link selection module;
a 6-signal attenuation module;
7-a signal generator;
8-power combiner.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other.
The invention is further described below with reference to the drawings and specific examples, which are not intended to be limiting.
Referring to fig. 1, the present invention provides a vehicle-mounted ethernet testing system, comprising:
a first connector (1) for connecting an ethernet interface of the test device;
a plurality of second connectors (3) with different types, which are used for respectively connecting the Ethernet interfaces of the corresponding tested devices;
the first conversion module (2) is connected with the first connector through a differential signal wire and is used for converting differential signals transmitted by the first connector into single-ended signals;
a second conversion module (4); the single-ended signals are converted into differential signals and then transmitted to the second connectors;
the link selection module (5) is arranged between the first conversion module and the second conversion module and is used for selecting one of the second connectors to be conducted with the first connector so as to realize single-ended signal transmission;
and the signal attenuation module (6) is connected between the first conversion module and the link selection module and is used for setting the attenuation of the single-ended signal converted by the first conversion module.
When different vehicle-mounted Ethernet interfaces are interconnected, the corresponding vehicle-mounted Ethernet interfaces are required to be connected at the designated positions, and then the intercommunication operation between the different interfaces is realized through operation setting. One of the tested Ethernet interfaces is communicated with the test equipment through the link selection module to perform Ethernet performance test, differential signals are converted into single-ended signal transmission through the first conversion module and the second conversion module and then restored into differential information, the intercommunication among different equipment is realized, the compatibility problem among different types of equipment is solved, and meanwhile, the signal attenuation module realizes network performance test under different scenes by setting attenuation. The invention has lower hardware technical difficulty and basically has no software workload.
The signal attenuation module is an adjustable attenuator. By changing different attenuation amounts of the single-ended signal, the method can be used for simulating network performance under different cable lengths and evaluating the long-line transmission distance of a network product. The signal attenuation module controls attenuation loss on the radio frequency channel and simulates attenuation under different cable lengths. The attenuation characteristics of the network cable at different frequencies are different, but the basic rule is that the higher the frequency is, the greater the attenuation is. The relationship between the attenuation and the signal transmission frequency, the cable length can be obtained through simulation or other empirical formulas.
By setting fixed attenuation and replacing different tested devices DUT, network throughput performance of different devices under the same environment can be compared. According to the set performance index criterion, the method can be used for screening defective products and guaranteeing the product testing yield.
Specifically, the differential signal impedance is 100 ohms and the single-ended signal impedance is 50 ohms.
Further, the method further comprises the following steps:
a signal generator (7) for generating an interference signal;
and the power synthesizer (8) is connected with the signal generator, is arranged between the first conversion module and the signal attenuation module, and is used for superposing the interference signal on the single-ended signal converted by the first conversion module.
By superimposing noise sources on the transmission channel, for example by generating noise-like interference signals with signal generators, it is possible to test and evaluate the anti-interference capabilities of different devices under test under specific conditions.
Variable 1 for a particular condition: the cable length is modeled by the signal attenuation module.
Variable 2 for a particular condition: the amount of noise energy is simulated by the signal generator.
The first connector (1) is connected with a test signal generating device, namely a test device Gloden device, at a transmitting end.
The signal generator is used for generating an interference signal, and the signal amplitude or the signal type of the interference source can be set according to the test requirement. Specifically, the signal generator (7) is connected with the power synthesizer (8) through an SMA cable.
Further, the method further comprises the following steps:
the first conversion module is a balance to unbalance generator.
Further, the method further comprises the following steps:
the second conversion module is a balance to unbalance generator.
The BALUN may be referred to as BALUN (BALUN). One balun for each differential signal line (differential pair) is required. The operating frequency band of balun meets the transmission quality index requirement of the vehicle-mounted Ethernet signal. For the 1000T1 interface of the gigabit vehicle-mounted network, the operating bandwidth of the balun meets the 750MHz bandwidth, and the balun with the bandwidth of more than 1GHz can meet the index requirement. The single-ended signal of the balun is connected to a link selection module (5). The link selection module (5) is a high-speed low-loss multi-way switch.
Further, the first connector is of the type H-MTD connector.
Currently, the types of vehicle connectors are various, and preferably, the type of the first connector is a rosenberg H-MTD connector. As another embodiment, the first connector may also be a Mini50 connector of Molex, a matanet connector of tavac, or a custom interface of some manufacturers such as a TBD series connector. Further, the type of second connector includes at least two of the following: H-MTD connector, mini50 connector, mateNet connector, TBD connector.
The vehicle connectors, such as the H-MTD connector, the Mini50 connector, the MateNet connector and the TBD connector, comprise a pair of differential signal wires, and for convenient control operation, the first connector and the second connector need to be soldered on a PCB comprising the differential signal wires due to the need for conversion between differential signals and single-ended signals.
Specifically, during gating, the second converter is connected with the link selection module through the SMA cable.
Further, the link selection module is a single pole, multi throw switch.
Further, the single-pole multi-throw switch is a single-pole multi-throw radio frequency switch.
Only one switch is selected at each time, when the type of the Ethernet interface of the tested equipment is determined in a normal working state, the corresponding signal link is conducted, and other switches are in an off state. The disconnected single-ended signal terminals are grounded through a 50 ohm load.
In the invention, the first connector needs one balun, and the tested end is provided with four Ethernet connectors, namely an H-MTD connector, a Mini50 connector, a MateNet connector and a TBD connector, so that 4 balun are needed, and one Ethernet connector of the tested end is selected through a single-pole four-throw switch to perform performance test.
The foregoing is merely illustrative of the preferred embodiments of the present invention and is not intended to limit the embodiments and scope of the present invention, and it should be appreciated by those skilled in the art that equivalent substitutions and obvious variations may be made using the description and illustrations of the present invention, and are intended to be included in the scope of the present invention.
Claims (8)
1. A vehicle-mounted ethernet testing system, comprising:
a first connector for connecting to an ethernet interface of the test device;
the second connectors are of different types and are used for being respectively connected with the Ethernet interfaces of the corresponding tested equipment;
the first conversion module is connected with the first connector through a differential signal wire and is used for converting differential signals transmitted by the first connector into single-ended signals;
a second conversion module; the single-ended signals are converted into differential signals and then transmitted to the second connectors;
the link selection module is arranged between the first conversion module and the second conversion module and is used for selecting one of the second connectors to be conducted with the first connector so as to realize single-ended signal transmission;
the signal attenuation module is connected between the first conversion module and the link selection module and is used for setting the attenuation of the single-ended signal converted by the first conversion module.
2. The in-vehicle ethernet testing system of claim 1, further comprising:
a signal generator for generating an interference signal;
and the power synthesizer is connected with the signal generator, is connected between the first conversion module and the signal attenuation module and is used for superposing the interference signal on the single-ended signal converted by the first conversion module.
3. The in-vehicle ethernet testing system of claim 1, further comprising:
the first conversion module is a balance-to-unbalance generator.
4. The in-vehicle ethernet testing system of claim 1, further comprising:
the second conversion module is a balance-to-unbalance generator.
5. The in-vehicle ethernet testing system of claim 1, wherein said link selection module is a single pole, multi throw switch.
6. The on-board ethernet testing system of claim 5, wherein said single pole, multi-throw switch is a single pole, multi-throw radio frequency switch.
7. An in-vehicle ethernet testing system according to claim 1, wherein said first connector is of the type H-MTD connector.
8. The in-vehicle ethernet testing system of claim 1, wherein said second connector type comprises at least two of: H-MTD connector, mini50 connector, mateNet connector, TBD connector.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310719414.9A CN116647478A (en) | 2023-06-16 | 2023-06-16 | Vehicle-mounted Ethernet test system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310719414.9A CN116647478A (en) | 2023-06-16 | 2023-06-16 | Vehicle-mounted Ethernet test system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116647478A true CN116647478A (en) | 2023-08-25 |
Family
ID=87624741
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310719414.9A Pending CN116647478A (en) | 2023-06-16 | 2023-06-16 | Vehicle-mounted Ethernet test system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116647478A (en) |
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2023
- 2023-06-16 CN CN202310719414.9A patent/CN116647478A/en active Pending
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