CN111131087A - Transmission system and signal transmission method for Ethernet physical layer signal - Google Patents
Transmission system and signal transmission method for Ethernet physical layer signal Download PDFInfo
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- CN111131087A CN111131087A CN201911284081.1A CN201911284081A CN111131087A CN 111131087 A CN111131087 A CN 111131087A CN 201911284081 A CN201911284081 A CN 201911284081A CN 111131087 A CN111131087 A CN 111131087A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L49/00—Packet switching elements
- H04L49/40—Constructional details, e.g. power supply, mechanical construction or backplane
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L49/00—Packet switching elements
- H04L49/10—Packet switching elements characterised by the switching fabric construction
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L49/00—Packet switching elements
- H04L49/35—Switches specially adapted for specific applications
- H04L49/351—Switches specially adapted for specific applications for local area network [LAN], e.g. Ethernet switches
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Abstract
The embodiment of the invention relates to the technical field of Ethernet, in particular to a transmission system and a signal transmission method of Ethernet physical layer signals, wherein a physical layer chip of a source terminal board is used for sending the physical layer signals to a switch circuit; when judging that the source terminal board is connected to the system backboard through the first inter-board connector, the switch circuit forwards the received physical layer signal to the system backboard through the first inter-board connector; the system back board transmits the received physical layer signal to the second inter-board connector so as to transmit the physical layer information to the physical layer chip of the terminal board through the second inter-board connector; and the physical layer chip of the terminal board transmits the received physical layer signal to the target service daughter board so as to debug the target service daughter board according to the physical layer signal. The embodiment of the invention can reduce the implementation cost of the system architecture of the Ethernet.
Description
Technical Field
The present invention relates to the field of ethernet technologies, and in particular, to a transmission system and a signal transmission method for ethernet physical layer signals
Background
In the system architecture of the ethernet, in order to debug the service daughter board, generally, a mac (media access control) media access control link layer in the system architecture is connected to a dedicated network switch chip and a corresponding module circuit, so as to transmit a signal of a physical layer to the service daughter board to be debugged through the dedicated network switch chip and the corresponding module circuit, thereby debugging the service daughter board.
In practice, it is found that the dedicated network switch chip and the corresponding module circuit are expensive, and adding one dedicated network switch chip and corresponding module circuit in the system architecture not only increases the device cost, but also occupies more motherboard layout and routing space, and has a lower cost performance; therefore, a transmission system of ethernet physical layer signals without using a dedicated network switch chip and a corresponding module circuit is needed to reduce the implementation cost of the system architecture of the ethernet.
Disclosure of Invention
The invention aims to overcome the defect that a special network switching chip is required to be added to transmit a physical layer signal to debug a service daughter board in the prior art, and provides a transmission system and a signal transmission method of an Ethernet physical layer signal, which are used for solving the problem that the existing Ethernet system architecture needs to be added with the special network switching chip to transmit the physical layer signal to debug the service daughter board, so that the device cost is increased.
The technical scheme adopted by the invention is as follows: disclosed is a transmission system of Ethernet physical layer signals, which comprises: the physical layer chip of source terminal board, switch circuit, first inter-board connector, system backplate, second inter-board connector, the physical layer chip and the target service daughter board of terminal board, wherein:
the physical layer chip of the source terminal board is used for sending a physical layer signal to the switch circuit;
the switch circuit is used for forwarding the received physical layer signal to the system backplane through the first inter-board connector when the source terminal board is judged to be connected to the system backplane through the first inter-board connector;
the system back board is used for forwarding the received physical layer signal to the second inter-board connector so as to forward the physical layer information to a physical layer chip of the terminal board through the second inter-board connector;
and the physical layer chip of the terminal board is used for forwarding the received physical layer signal to the target service daughter board so as to debug the target service daughter board according to the physical layer signal.
The invention also discloses a signal transmission method, which is applied to a transmission system of Ethernet physical layer signals, and the system comprises: the physical layer chip of a source terminal board, a switch circuit, a first inter-board connector, a system backplane, a second inter-board connector, the physical layer chip of a terminal board and a target service daughter board, wherein the method comprises the following steps:
a physical layer chip of the source terminal board sends a physical layer signal to the switch circuit;
when the switch circuit judges that the source terminal board is connected to the system backboard through the first inter-board connector, the switch circuit forwards the received physical layer signal to the system backboard through the first inter-board connector;
the system backplane forwards the received physical layer signal to the second inter-board connector to forward the physical layer information to a physical layer chip of the terminal board through the second inter-board connector;
and the physical layer chip of the terminal board forwards the received physical layer signal to the target service daughter board so as to debug the target service daughter board according to the physical layer signal.
Compared with the prior art, the invention has the beneficial effects that:
the invention constructs a simple transmission system of Ethernet physical layer signals and a signal transmission method thereof by using common passive devices to realize the function of transmitting the Ethernet physical layer signals, and then the physical layer signals can be transmitted to a service daughter board to debug a service mainboard; therefore, compared with the traditional implementation mode, the implementation of the invention saves a special network chip containing port switching and serial transceiving functions and a matched module circuit, reduces the layout and routing space of the mainboard, and effectively reduces the implementation cost of the system architecture of the Ethernet; in addition, the transmission system of the ethernet physical layer signal disclosed in the embodiment of the present invention does not use a transformer coupling manner to connect the daughter board and the backplane, and conforms to the atca (advanced telecommunications Computing architecture) standard, i.e., the design specification of the advanced telecommunications Computing platform.
Drawings
Fig. 1 is a schematic structural diagram of a transmission system of ethernet physical layer signals disclosed in this embodiment.
Fig. 2 is a schematic structural diagram of another ethernet physical layer signal transmission system disclosed in this embodiment.
Fig. 3 is a schematic flow chart of a signal transmission method according to an embodiment of the present invention.
Fig. 4 is a schematic flow chart of another signal transmission method according to the embodiment of the present invention.
Detailed Description
The drawings are only for purposes of illustration and are not to be construed as limiting the invention. For a better understanding of the following embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
Example 1
As shown in fig. 1, fig. 1 is a schematic structural diagram of a transmission system of ethernet physical layer signals disclosed in this embodiment, and the system may include: a physical layer chip 101 of a source terminal board, a switch circuit 102, a first inter-board connector 103, a system backplane 104, a second inter-board connector 105, a physical layer chip 106 of a terminal board, and a target service daughter board 107, wherein:
a physical layer chip 101 of a source terminal board for transmitting a physical layer signal to the switch circuit 102.
In the embodiment of the present invention, the source terminal board may be any ethernet development motherboard for sending physical layer signals, and the ethernet development motherboard may be configured with components such as a physical layer chip; the physical layer chip may be a physical layer device operating an Open System Interconnection Reference Model (OSI), and the physical layer chip may be configured to send and receive data frames of an ethernet network.
In the embodiment of the present invention, the physical layer signal may be a signal sent by a physical layer of the source terminal board, and the signal may include contents such as a debugging instruction and debugging data for debugging the target service motherboard, which is not limited in the embodiment of the present invention; in addition, by transmitting the physical layer signal to the switch circuit 102 by the physical layer chip 101 of the source terminal board, it is also possible to ensure stable transmission of various instructions and data included in the physical layer signal over various physical media.
In the embodiment of the present invention, since the physical layer signal is transmitted in the transmission system of the ethernet physical layer signal disclosed in the embodiment of the present invention, that is, in the same network communication system, since it is not required to be compatible with an external unknown network device, the communication rate of the signal can be set to 10Mbps/100Mbps/100010Mbps, etc. as required, the embodiment of the present invention is not limited; in addition, in order to simplify the auto-negotiation process, the transmission mode of the signal may be a cross transmission mode.
As an optional implementation manner, the transmission system of ethernet signals may further include: a predetermined tamper-proof device, and:
the physical layer chip 101 of the source terminal board may be further configured to determine whether the model of the physical layer chip 101 of the source terminal board is a model without the built-in terminal matching resistor according to the obtained specification information of the physical layer chip 101 of the source terminal board before the physical layer chip 101 of the source terminal board sends a physical layer signal to the switch circuit 102;
and the physical layer chip 101 of the source terminal board can also be used for accessing a preset interference preventing device to prevent a physical layer signal sent by the physical layer chip 101 of the source terminal board from being interfered when the physical layer chip 101 of the source terminal board judges that the model of the physical layer chip 101 of the source terminal board is a model without the built-in terminal matching resistor.
In the specific implementation process, the physical layer chip can be divided into two types of integrated terminal matching resistors and non-built-in terminal matching resistors; because the terminal matching resistor can prevent the signal of the system from being interfered, for the type of the physical layer chip without the built-in terminal matching resistor, the four pairs of differential signals of the physical layer chip of the source terminal board can be accessed into a preset interference preventing device to prevent the physical layer signal sent by the physical layer chip 101 of the source terminal board from being interfered; and for the physical layer chip with the model of the integrated terminal matching resistor, the preset anti-interference device can not be accessed.
It needs to be further explained that: the preset interference preventing device may be a device selected by a developer according to a large amount of development data, and is used for preventing the physical layer signal from being interfered, and the embodiment of the present invention is not limited.
By implementing the method, when the type of the physical layer chip of the source terminal board is judged to be the type without the built-in terminal matching resistor, a preset interference preventing device is accessed to replace the terminal matching resistor which can prevent the system signal from being interfered, so that the physical layer signal sent by the physical layer chip of the source terminal board is prevented from being interfered.
The switch circuit 102 is configured to forward the received physical layer signal to the system backplane 104 through the first inter-board connector 103 when it is determined that the source terminal board is connected to the system backplane 104 through the first inter-board connector 103.
In the embodiment of the present invention, the switch circuit 102 may be a logic circuit designed by a developer, and may be connected to the physical layer chip 101 of the source terminal board; the switching circuit 102 may include, but is not limited to: a logic circuit that determines whether or not the source terminal board is connected to the system backplane 104 through the first inter-board connector 103; further, when the switch circuit 102 determines that the source terminal board is connected to the system backplane 104 through the first inter-board connector 103 through the logic circuit, the switch circuit may forward the received physical layer signal to the system backplane 104 through the first inter-board connector 103.
In a specific implementation process, the first board-to-board connector 103 may be a connecting device with signal transmission capability, which is used to connect different motherboards, so that the different motherboards can perform signal transmission with each other.
A system backplane 104 for forwarding the received physical layer signal to the second inter-board connector 105 to forward the physical layer information to the physical layer chip 106 of the terminal board through the second inter-board connector 105.
In the embodiment of the present invention, the system backplane 104 may be used to connect daughter boards (i.e., the source terminal board and the terminal daughter board, etc.), and may form a system with the connected daughter boards, so as to transmit signals between the daughter boards. The system backplane 104 may forward physical layer signals received from the physical layer chips of the source terminal board to the second inter-board connector 105 to forward physical layer information to the physical layer chips 106 of the terminal board through the second inter-board connector 105.
In a specific implementation, the second board-to-board connector 105 and the first board-to-board connector 103 may be two connectors of the same type; the first inter-board connector 103 is used to connect the source terminal board and the system backplane 104, and the second inter-board connector 105 is used to connect the system backplane 104 and the terminal board. Obviously, the second inter-board connector 105 also has signal transmission capability, and the system backplane 104 may forward the physical layer information to the physical layer chip 106 of the terminal board through the second inter-board connector 105.
As an optional implementation manner, the transmission system of the ethernet physical layer signal may further include a coupling capacitor, and the system backplane 104 is configured to forward the received physical layer signal to the second inter-board connector 105, and a manner of forwarding the physical layer information to the physical layer chip 106 of the terminal board through the second inter-board connector 105 may specifically be: a system backplane 104 for forwarding the received physical layer signal to a second inter-board connector 105; and a second inter-board connector 105 for forwarding the received physical layer signal to the physical layer chip 106 of the terminal board through the coupling capacitance.
In a specific implementation process, for the case of interconnection between boards (i.e. insertion into a system backplane), in order to isolate direct current and support hot plugging, coupling capacitors can be connected to the daughter boards at both ends of a link; for the case that the source end and the terminal are on the same circuit board (i.e. the system back plate is not inserted), only one pair of coupling capacitors can be accessed; in addition, the coupling capacitor can be connected at the symmetrical positions of the positive electrode and the negative electrode of the same group of differential pairs, the wiring lengths are consistent, and the distance between the wiring lengths and the physical layer chip can be equal.
It needs to be further explained that: the coupling capacitor may be an ac coupling capacitor; further, to match the device parameters of the network, dc isolation and ac coupling may use non-polar 0.1 μ F ceramic capacitors; 27pF can be selected for a load capacitor connected across the differential positive and negative single-ended signals, and two capacitors of 49.9 omega can be selected to be connected in series for a terminal resistor.
By implementing the method, the coupling capacitor can be accessed between the second inter-board connector and the terminal sub-board, so that the effects of isolating direct current and supporting hot plug are achieved; and according to the Ethernet standard of 10BASE-T/100BASE-T/1000BASE-T, the circuit is applied to a communication scene between a back plate and a daughter board (belonging to the same electrical system, signals have common reference potential), a reasonable signal electrical matching design is carried out, and a common isolation transformer or a shunt coil can be effectively replaced by using a capacitive alternating current coupling circuit.
And the physical layer chip 106 of the terminal board is used for forwarding the received physical layer signal to the target service daughter board 107 so as to debug the target service daughter board 107 according to the physical layer signal.
In the embodiment of the invention, the terminal daughter board can be any Ethernet development mainboard for receiving physical layer signals, and the Ethernet development mainboard can also be configured with components such as a physical layer chip and the like; the embodiments of the present invention are not limited.
In the embodiment of the present invention, the target service daughter board 107 may be a circuit board connected to a terminal daughter board and used for executing different services, and after receiving the physical layer signal, the terminal board may forward the physical layer signal to the target service daughter board 107, and debug the target service daughter board 107 according to a debug instruction and debug data included in the physical layer signal.
In the embodiment of the invention, the differential line pair can keep the characteristic impedance (100 omega +/-10%) consistent in the whole transmission path (the source terminal board, the first inter-board connector, the system backboard, the second inter-board connector and the terminal board) to reduce the reflection of signals; and adjacent differential pairs of different groups can maintain a differential pair intra-group spacing greater than 3 times to reduce signal crosstalk and improve signal quality; and the reference ground continuity of the differential signals can be kept, and the signal wiring is prevented from crossing different power division planes and being far away from a noise interference source.
In the embodiment of the invention, in the layout of the device, the RC matching circuit can be close to a network transceiver chip (physical layer chip) of a source terminal board or a terminal board, and meanwhile, the network transceiver chip can be close to an inter-board connector. And on the routing of the circuit board, the stub wire head of the circuit bifurcation point can be shortened to reduce the signal reflection and the antenna effect
It can be seen that, the system described in fig. 1 is implemented, that is, a simple transmission system for ethernet physical layer signals is constructed by using a common passive device, so as to implement the function of transmitting ethernet physical layer signals, and then the service daughter board is debugged according to the physical layer signals; therefore, compared with the traditional implementation mode, the implementation of the embodiment of the invention saves a special network chip containing port switching and serial transceiving functions and a matched module circuit, reduces the layout and routing space of a mainboard, and effectively reduces the implementation cost of the system architecture of the Ethernet; in addition, the transmission system of the ethernet physical layer signal disclosed in the embodiment of the present invention does not use a transformer coupling manner to connect the daughter board and the backplane, and conforms to the atca (advanced telecom computing architecture) standard, i.e., the design specification of the advanced telecom computing platform.
Example 2
As shown in fig. 2, fig. 2 is a schematic structural diagram of another ethernet physical layer signal transmission system disclosed in this embodiment, the system shown in fig. 2 is obtained by optimizing the system shown in fig. 1, and compared with the system shown in fig. 1, the system shown in fig. 2 further includes: transformer 108, first connection portal 109, net twine 110 and second connection portal 111, wherein:
the switch circuit 102 is further configured to forward the physical layer signal to the transformer 108 when it is determined that the source terminal board is not connected to the system backplane 104 through the first inter-board connector 103.
In the embodiment of the present invention, the switch circuit 102 may further forward the physical layer signal to the transformer 108 when it is determined through the logic circuit that the source terminal board is not connected to the system backplane 104 through the first inter-board connector 103.
And a transformer 108 for forwarding the received physical layer signal to the first connection port 109.
In the embodiment of the present invention, the transformer 108 may forward the received physical layer signal to the first connection port 109 by converting a voltage.
The first connection port 109 is configured to forward the received physical layer signal to the second connection port 111 through the network cable 110.
In the embodiment of the present invention, the first connection port 109 may be an RJ-45 connector; the RJ-45 connector is one of information socket (communication outlet) connectors in a wiring system, and consists of a plug (connector, crystal head) and a socket (module), wherein the plug is provided with 8 grooves and 8 contacts; it needs to be further explained that: RJ is the interface that describes the public telecommunication network and RJ-45 of the computer network is the common name for the standard 8-bit modular interface.
Because the first connection port 109 has a network connection function, the first connection port 109 can forward the received physical layer signal to the second connection port 111 through the network cable 110; wherein the network cable 110 may include: a category 5 Unshielded Twisted Pair (UTP) (i.e., a common network cable), differential traces of a Printed Circuit Board (PCB) backplane, and optical fibers, which are not limited in the embodiments of the present invention.
As an optional implementation, the ethernet physical layer signal transmission system may further include a device magnetic bead, not shown in the figure, and:
the first connection port 109 is further configured to determine whether the driving mode of the physical layer chip of the source terminal board is the current driving mode according to the obtained specification information of the physical layer chip of the source terminal board before the first connection port 109 forwards the received physical layer signal to the second connection port 111 through the network cable 110; and the first connection port 109 is also configured to connect the magnetic beads to receive the driving current and the bias voltage output by the magnetic beads when it is determined that the driving mode of the physical layer chip of the source terminal board is the current driving mode.
In a specific implementation process, the physical layer chip can be divided into two specifications of a current driving mode and a voltage driving mode, and a magnetic bead needs to be externally connected to the physical layer chip with the driving mode being the current driving mode so as to provide a driving current and a bias voltage for a signal link; on the contrary, for the physical layer chip with the driving mode being the voltage driving mode, the external access of the magnetic beads is not required. The magnetic bead is a passive electronic component, which is used to suppress high-frequency noise and spike interference on a signal line and a power line, and has the ability to absorb electrostatic pulses.
It needs to be further explained that: because the magnetic beads are connected to provide a driving current and a bias voltage for the signal link, when the first connection port 109 determines that the driving mode of the physical layer chip of the source terminal board is the current driving mode according to the obtained specification information of the physical layer chip of the source terminal board, the first connection port 109 may be connected to the magnetic beads to receive the driving current and the bias voltage output by the magnetic beads, so as to provide the driving current and the bias voltage for the transmission of the physical layer signal, thereby ensuring the normal transmission of the signal.
By implementing the method, when the driving mode of the physical layer chip is judged to be the current driving mode, the magnetic beads are connected to the connecting network port to receive the driving current and the bias voltage output by the magnetic beads, and further the normal transmission of the physical layer signal is ensured.
And the second connection port 111 is configured to forward the received physical layer signal to the target service daughter board 107, so as to debug the target service daughter board 107 according to the physical layer signal.
In the embodiment of the present invention, the second connection port 111 may also be an RJ-45 connector, and because it has a function of connecting a network, the second connection port 111 may forward the received physical layer signal to the target service daughter board 107, so as to debug the target service daughter board 107 according to the physical layer signal.
In the embodiment of the invention, a general FR-4PCB plate is used, and a transmission system of the Ethernet physical layer signal is designed according to the specification that a differential signal runs through a strip line and the maximum total length of a path is 96 inches; measuring by an oscilloscope to obtain an equivalent calculation to obtain a signal attenuation value smaller than-2 dB; and network communication can work normally under two scenes that a daughter board connected with an unshielded twisted pair is debugged independently and a system backboard is inserted to carry out system combined debugging through PCB wiring of an inter-board connector.
In addition, the transmission system of the Ethernet physical layer signal disclosed by the embodiment of the invention can be switched between two scenes of independently debugging the target service daughter board and jointly debugging other daughter boards connected with the plug-in backplane, thereby improving the flexibility and convenience of debugging. Wherein: when the service daughter board is independently debugged, an Alternating Current (AC) coupling capacitor can be attached in an empty mode, and a CON1 pin of the RJ-45 network port connector is welded; when a system back plate is inserted and connected with other service daughter boards for joint communication, an RJ-45 network port connector CON1 pin can be attached in an empty mode, and an alternating current AC coupling capacitor is welded to achieve switching of two debugging scenes.
It can be seen that, compared with the system described in fig. 1, the system described in fig. 2 can be implemented, and another simple transmission system for ethernet physical layer signals can be built by using another common passive device, so as to implement the function of transmitting ethernet physical layer signals, and further debug the service daughter board according to the physical layer signals; compared with the traditional implementation mode, the special network chip with the port switching and serial transceiving functions and the matched module circuit are saved, the layout and routing space of the mainboard are reduced, and the implementation cost of the system architecture of the Ethernet is effectively reduced; in addition, the system can also support two debugging modes of inter-board debugging (namely debugging by inserting a system backboard) and independent debugging (namely debugging without inserting the system backboard), so that the use experience of a user is improved.
Example 3
As shown in fig. 3, fig. 3 is a schematic flowchart of a signal transmission method disclosed in the embodiment of the present invention, where the signal transmission method is applied to the transmission system of ethernet physical layer signals shown in fig. 1, and the system may include: the signal transmission method comprises the following steps of:
301. the physical layer chip of the source terminal board sends a physical layer signal to the switching circuit.
As an optional implementation manner, the transmission system of the ethernet physical layer signal may further include a preset interference prevention device, and before the physical layer chip of the source terminal board sends the physical layer signal to the off-circuit, the physical layer chip of the source terminal board may further determine, according to the obtained specification information of the physical layer chip of the source terminal board, whether the model of the physical layer chip of the source terminal board is a model without the built-in terminal matching resistor; and when the physical layer chip of the source terminal board judges that the model of the physical layer chip of the source terminal board is the model without the built-in terminal matching resistor, a preset anti-interference device can be accessed to prevent the physical layer signal sent by the physical layer chip of the source terminal board from being interfered.
By implementing the method, when the type of the physical layer chip of the source terminal board is judged to be the type without the built-in terminal matching resistor, a preset interference preventing device is accessed to replace the terminal matching resistor which can prevent the system signal from being interfered, so that the physical layer signal sent by the physical layer chip of the source terminal board is prevented from being interfered.
302. When the switch circuit judges that the source terminal board is connected to the system backboard through the first inter-board connector, the switch circuit forwards the received physical layer signal to the system backboard through the first inter-board connector.
303. The system backplane forwards the received physical layer signal to the second inter-board connector to forward the physical layer information to the physical layer chip of the terminal board through the second inter-board connector.
As an optional implementation, the transmission system of the ethernet physical layer signal may further include a coupling capacitor, and the system backplane forwards the received physical layer signal to the second inter-board connector, so as to forward the physical layer information to the physical layer chip of the terminal board through the second inter-board connector, which may be: the system backboard forwards the received physical layer signal to the second inter-board connector; and the second inter-board connector forwards the received physical layer signal to the physical layer chip of the terminal board through the coupling capacitance.
By implementing the method, the coupling capacitor can be connected between the second inter-board connector and the terminal sub-board, so that the effects of isolating direct current and supporting hot plug are achieved.
304. And the physical layer chip of the terminal board transmits the received physical layer signal to the target service daughter board so as to debug the target service daughter board according to the physical layer signal.
It can be seen that, the signal transmission method described in fig. 3 can be implemented in a simple ethernet physical layer signal transmission system constructed by using a common passive device, so as to implement the function of transmitting ethernet physical layer signals, and further debug the service daughter board according to the physical layer signals; therefore, compared with the traditional implementation mode, the implementation of the embodiment of the invention saves a special network chip containing port switching and serial transceiving functions and a matched module circuit, reduces the layout and routing space of a mainboard, and effectively reduces the implementation cost of the system architecture of the Ethernet; in addition, the transmission system of the ethernet physical layer signal disclosed in the embodiment of the present invention does not use a transformer coupling manner to connect the daughter board and the backplane, and conforms to the atca (advanced Telecom Computing architecture) standard, i.e., the design specification of the advanced Telecom Computing platform.
Example 4
As shown in fig. 4, fig. 4 is a schematic flowchart of another signal transmission method disclosed in the embodiment of the present invention, where the signal transmission method is applied to the transmission system of ethernet physical layer signals shown in fig. 2, and the system may include: the signal transmission method comprises the following steps of:
401. the physical layer chip of the source terminal board sends a physical layer signal to the switching circuit.
402. And the switch circuit forwards the physical layer signal to the transformer when judging that the source terminal board is not connected to the system backboard through the first inter-board connector.
403. The transformer forwards the received physical layer signal to the first connection port.
404. The first connection port forwards the received physical layer signal to the second connection port through the network cable.
As an optional implementation manner, the transmission system of the ethernet physical layer signal may further include a magnetic bead, and before the first connection port forwards the received physical layer signal to the second connection port through the network cable, the first connection port may further determine, according to the obtained specification information of the physical layer chip of the source terminal board, whether the driving mode of the physical layer chip of the source terminal board is the current driving mode; and the first connection network port can also be used for connecting the magnetic beads to receive the driving current and the bias voltage output by the magnetic beads when the driving mode of the physical layer chip of the source terminal board is judged to be the current driving mode.
By implementing the method, when the driving mode of the physical layer chip is judged to be the current driving mode, the magnetic beads are connected to the connecting network port to receive the driving current and the bias voltage output by the magnetic beads, and further the normal transmission of the physical layer signal is ensured.
405. And the second connection network port forwards the received physical layer signal to the target service daughter board so as to debug the target service daughter board according to the physical layer signal.
It can be seen that, compared with the method described in fig. 3, the method described in fig. 4 can be implemented on another simple ethernet physical layer signal transmission system built by using other common passive devices to implement the function of transmitting ethernet physical layer signals, so as to debug the service daughter board according to the physical layer signals; compared with the traditional implementation mode, the special network chip with the port switching and serial transceiving functions and the matched module circuit are saved, the layout and routing space of the mainboard are reduced, and the implementation cost of the system architecture of the Ethernet is effectively reduced; in addition, the system can also support two debugging modes of inter-board debugging (namely debugging by inserting a system backboard) and independent debugging (namely debugging without inserting the system backboard), so that the use experience of a user is improved.
It should be understood that the above-mentioned embodiments of the present invention are only examples for clearly illustrating the technical solutions of the present invention, and are not intended to limit the specific embodiments of the present invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention claims should be included in the protection scope of the present invention claims.
Claims (10)
1. A system for transmitting ethernet physical layer signals, the system comprising: the physical layer chip of source terminal board, switch circuit, first inter-board connector, system backplate, second inter-board connector, the physical layer chip and the target service daughter board of terminal board, wherein:
the physical layer chip of the source terminal board is used for sending a physical layer signal to the switch circuit;
the switch circuit is used for forwarding the received physical layer signal to the system backplane through the first inter-board connector when the source terminal board is judged to be connected to the system backplane through the first inter-board connector;
the system back board is used for forwarding the received physical layer signal to the second inter-board connector so as to forward the physical layer information to a physical layer chip of the terminal board through the second inter-board connector;
and the physical layer chip of the terminal board is used for forwarding the received physical layer signal to the target service daughter board so as to debug the target service daughter board according to the physical layer signal.
2. The ethernet physical layer signal transmission system according to claim 1, further comprising: transformer, first net gape of connecting, net twine and second connect the net gape, wherein:
the switch circuit is further configured to forward the physical layer signal to the transformer when it is determined that the source terminal board is not connected to the system backplane through the first inter-board connector;
the transformer is used for forwarding the received physical layer signal to the first connection port;
the first connection port is configured to forward the received physical layer signal to the second connection port through the network cable;
and the second connection network port is used for forwarding the received physical layer signal to the target service daughter board so as to debug the target service daughter board according to the physical layer signal.
3. The ethernet physical layer signal transmission system according to claim 2, further comprising a magnetic bead, wherein:
the first connection port is further configured to determine whether a driving mode of a physical layer chip of the source terminal board is a current driving mode according to the obtained specification information of the physical layer chip of the source terminal board before the first connection port forwards the received physical layer signal to the second connection port through the network cable;
the first connection network port is further configured to connect the magnetic beads to receive the driving current and the bias voltage output by the magnetic beads when the first connection network port determines that the driving mode of the physical layer chip of the source terminal board is the current driving mode.
4. The transmission system of ethernet physical layer signals according to claim 1, further comprising a coupling capacitor; the system backplane forwards the received physical layer signal to the second inter-board connector, and the way of forwarding the physical layer information to the physical layer chip of the terminal board through the second inter-board connector is specifically:
the system backplane is configured to forward the received physical layer signal to the second inter-board connector;
and the second inter-board connector is used for forwarding the received physical layer signal to a physical layer chip of the terminal board through the coupling capacitor.
5. The system according to claim 1, further comprising a predetermined interference preventing device, wherein:
the physical layer chip of the source terminal board is also used for judging whether the model of the physical layer chip of the source terminal board is the model without the built-in terminal matching resistor or not according to the obtained specification information of the physical layer chip of the source terminal board before the physical layer chip of the source terminal board sends a physical layer signal to the switch circuit;
the physical layer chip of the source terminal board is further used for accessing the preset anti-interference device to prevent a physical layer signal sent by the physical layer chip of the source terminal board from being interfered when the physical layer chip of the source terminal board judges that the model of the physical layer chip of the source terminal board is a model without a built-in terminal matching resistor.
6. A signal transmission method, which is applied to a transmission system of ethernet physical layer signals, the system comprising: the physical layer chip of a source terminal board, a switch circuit, a first inter-board connector, a system backplane, a second inter-board connector, the physical layer chip of a terminal board and a target service daughter board, wherein the method comprises the following steps:
a physical layer chip of the source terminal board sends a physical layer signal to the switch circuit;
when the switch circuit judges that the source terminal board is connected to the system backboard through the first inter-board connector, the switch circuit forwards the received physical layer signal to the system backboard through the first inter-board connector;
the system backplane forwards the received physical layer signal to the second inter-board connector to forward the physical layer information to a physical layer chip of the terminal board through the second inter-board connector;
and the physical layer chip of the terminal board forwards the received physical layer signal to the target service daughter board so as to debug the target service daughter board according to the physical layer signal.
7. The signal transmission method according to claim 6, wherein the system further comprises: the system comprises a transformer, a first connecting net port, a net wire and a second connecting net port; after the physical layer chip of the source terminal board sends a physical layer signal to the switching circuit, the method further comprises:
the switch circuit forwards the physical layer signal to the transformer when judging that the source terminal board is not connected to the system backboard through the first inter-board connector;
the transformer forwards the received physical layer signal to the first connection port;
the first connection port forwards the received physical layer signal to the second connection port through the network cable;
and the second connection network port forwards the received physical layer signal to the target service daughter board so as to debug the target service daughter board according to the physical layer signal.
8. A signal transmission method according to claim 7, wherein the system further comprises magnetic beads; before the first connection portal forwards the received physical layer signal to the second connection portal through the network cable, the method further comprises:
the first connection port judges whether the driving mode of the physical layer chip of the source terminal board is a current driving mode according to the obtained specification information of the physical layer chip of the source terminal board;
and when judging that the driving mode of the physical layer chip of the source terminal board is a current driving mode, the first connection network port is connected with the magnetic beads to receive the driving current and the bias voltage output by the magnetic beads.
9. The signal transmission method according to claim 6, wherein the system further comprises a coupling capacitor; the system backplane forwards the received physical layer signal to the second inter-board connector to forward the physical layer information to a physical layer chip of the terminal board through the second inter-board connector, including:
the system backplane forwards the received physical layer signal to the second inter-board connector;
the second inter-board connector forwards the received physical layer signal to a physical layer chip of the terminal board through the coupling capacitance.
10. The signal transmission method according to claim 6, wherein the system further comprises a preset interference preventing device; before the physical layer chip of the source terminal board sends a physical layer signal to the switching circuit, the method further comprises:
judging whether the type of the physical layer chip of the source terminal board is the type without the built-in terminal matching resistor or not by the physical layer chip of the source terminal board according to the obtained specification information of the physical layer chip of the source terminal board;
and when the physical layer chip of the source terminal board judges that the model of the physical layer chip of the source terminal board is the model without the built-in terminal matching resistor, accessing the preset anti-interference device to prevent the physical layer signal sent by the physical layer chip of the source terminal board from being interfered.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
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| CN201911284081.1A CN111131087B (en) | 2019-12-13 | 2019-12-13 | Transmission system and signal transmission method for Ethernet physical layer signal |
| PCT/CN2020/141935 WO2021115492A1 (en) | 2019-12-13 | 2020-12-31 | Transmission system for ethernet physical layer signal, and signal transmission method |
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| CN201911284081.1A CN111131087B (en) | 2019-12-13 | 2019-12-13 | Transmission system and signal transmission method for Ethernet physical layer signal |
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| CN111131087B CN111131087B (en) | 2021-07-16 |
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| WO2021115492A1 (en) | 2021-06-17 |
| CN111131087B (en) | 2021-07-16 |
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