Optical splitter, slave gateway, master gateway and electrical signal transmission method

Abstract

The embodiment of the present application discloses an optical splitter, a slave gateway, a master gateway and an electrical signal transmission method. The optical splitter and the slave gateway are connected by an optoelectronic composite cable. In this way, in addition to the normal transmission of optical signals between the optical splitter and the slave gateway through the optical fiber in the optoelectronic composite cable, the optical splitter and the slave gateway can also interact with each other through the electrical cable in the optoelectronic composite cable. In other words, without affecting the normal transmission of optical signals, it is equivalent to adding a new channel for interactive information between the optical splitter and the slave gateway, so that the optical splitter can obtain the current topology structure in real time according to the information interacted with the slave gateway, thereby effectively managing and maintaining the FTTR network. In addition, this solution can be implemented using the existing optoelectronic composite cables that have been laid, without the need to remodel the optoelectronic composite cables, thus saving the laying cost.

Description

Technical Field

[0001] The present application relates to the FTTR field, and in particular to an optical splitter, a slave gateway, a master gateway and an electrical signal transmission method. Background Art

[0002] With the popularization of fixed access broadband and the emergence of various smart terminals, in order to solve the problem of home network WiFi coverage, fiber to the room (FTTR) technology has been proposed and received widespread attention. The main idea of ​​FTTR is to extend the optical fiber further to the residents' rooms on the basis of fiber to the home (FTTH). The current FTTH network construction mode is to introduce the optical fiber into the weak current information box in the residents' room, and the user's WiFi access device is installed in the information box. Since the information box is usually located near the entrance door and far away from the user's daily activity area, the WiFi signal loss is large, resulting in limited user terminal access bandwidth. The main idea of ​​FTTR is to extend the optical fiber further downward to the residents' room and install the WiFi access device inside the room, which shortens the distance between the user terminal device and the WiFi device, ensures the quality of the WiFi signal, and solves the problem of poor user terminal equipment caused by unstable WiFi access.

[0003] The FTTR network mainly includes a master gateway, at least one optical splitter and at least one slave gateway. The master gateway is connected to at least one optical splitter in a cascade manner, and each slave gateway is connected to a branch port of the corresponding optical splitter. Currently, the current topology is mainly identified manually, which is inefficient and prone to errors, and is not conducive to the management and maintenance of the FTTR network. Summary of the invention

[0004] The embodiments of the present application provide an optical splitter, a slave gateway, a master gateway and an electrical signal transmission method. The optical splitter and the slave gateway can also interact with each other through the cables in the optoelectronic composite cable, so that the optical splitter can obtain the current topology structure in real time based on the information interacted with the slave gateway, thereby effectively managing and maintaining the FTTR network.

[0005] In a first aspect, an embodiment of the present application provides an optical splitter. The optical splitter includes: a control unit, a sending unit, a receiving unit, and N first ports, wherein the N first ports are respectively connected to N slave gateways through first optoelectronic composite cables, and N is an integer greater than 1. Specifically, the receiving unit is used to receive N first electrical signals input from the N first ports, respectively, and transmit the N first electrical signals to the control unit, wherein the N first electrical signals come from the N slave gateways, respectively. The control unit is used to generate a second electrical signal. The sending unit is used to transmit the second electrical signal to the N first ports, so that the second electrical signal is output from the N first ports to the N slave gateways, respectively.

[0006] In this implementation, the optical splitter and the slave gateway are connected through an optoelectronic composite cable. In this way, in addition to the normal transmission of optical signals between the optical splitter and the slave gateway through the optical fiber in the optoelectronic composite cable, the optical splitter and the slave gateway can also interact with each other through the electrical cable in the optoelectronic composite cable. In other words, without affecting the normal transmission of optical signals, it is equivalent to adding a new channel for interactive information between the optical splitter and the slave gateway, so that the optical splitter can obtain the current topology structure in real time based on the information interacted with the slave gateway, thereby effectively managing and maintaining the FTTR network. In addition, this solution can be implemented using the existing optoelectronic composite cables that have been laid, without the need to remodel the optoelectronic composite cables, saving laying costs.

[0007] In some possible implementations, the first electrical signal is a differential signal, and / or the second electrical signal is a differential signal. It should be understood that, compared with single-ended signals, differential signals have stronger anti-interference capabilities, can effectively suppress electromagnetic interference (EMI), and have the advantage of precise timing positioning.

[0008] In some possible implementations, the optical splitter further includes a power supply, which is used to output a power supply voltage, and the power supply voltage is transmitted to the N slave gateways through the first optoelectronic composite cable. In other words, in addition to realizing the electrical signal interaction between the optical splitter and the slave gateway, the solution provided by the present application can also be compatible with the optical splitter to power each slave gateway through the optoelectronic composite cable, which has a better practical effect.

[0009] In some possible implementations, the optical splitter further includes an isolation unit, which is connected to the transmitting unit, the receiving unit, the power supply, and the first port, respectively. The isolation unit is used to: isolate the power supply voltage to prevent the power supply voltage from being transmitted to the control unit through the receiving unit; and isolate the first electrical signal and the second electrical signal to prevent the first electrical signal and the second electrical signal from being transmitted to the power supply. In this implementation, the power supply voltage and the interacting electrical signal are isolated by the isolation unit, so that the power supply and the electrical signal transmission do not interfere with each other.

[0010] In some possible implementations, the isolation unit includes a coupling capacitor module and an isolation inductor module. The coupling capacitor module is used to isolate the power supply voltage to prevent the power supply voltage from being transmitted to the control unit through the receiving unit. The isolation inductor module is used to isolate the first electrical signal and the second electrical signal to prevent the first electrical signal and the second electrical signal from being transmitted to the power supply. In this implementation, a specific implementation method of the isolation unit is provided to enhance the feasibility of the present solution.

[0011] In some possible implementations, each first electrical signal carries status information of a slave gateway, so that the optical splitter can understand the status of each slave gateway connected thereto.

[0012] In some possible implementations, the optical splitter further includes N indicator lights, and the control unit is further used to control the working modes of the N indicator lights respectively according to the status information of the N slave gateways. The working modes of the indicator lights are used to reflect the status information of the gateways, thereby realizing the visualization of the status of the slave gateways, which is convenient for management and maintenance.

[0013] In some possible implementations, the control unit is specifically configured to generate a second electrical signal based on the status information of the N slave gateways, and the second electrical signal carries the topology information between the optical splitter and the N slave gateways. In other words, the optical splitter can aggregate the status information of each slave gateway to generate topology information, so as to facilitate real-time updating of the topology information.

[0014] In some possible implementations, the optical splitter further includes a first N-to-one switch and a second N-to-one switch, the sending unit is connected to the first N-to-one switch, the receiving unit is connected to the second N-to-one switch, and the control unit is used to control the on and off of the first N-to-one switch and the second N-to-one switch. It should be understood that the use of the N-to-one switch can effectively simplify the structure of the optical splitter and reduce the space occupied by the switch.

[0015] In some possible implementations, the optical splitter further includes a second port, the second port is connected to the main gateway or the first optical splitter through a second optoelectronic composite cable, and the optical splitter and the main gateway or the first optical splitter are connected through the second optoelectronic composite cable to transmit electrical signals. In this implementation, the optical splitter can also transmit electrical signals to the main gateway or the upper-level cascaded optical splitter through the optoelectronic composite cable, thereby improving the scalability of the solution.

[0016] In some possible implementations, the optical splitter further includes a third port, the third port is connected to the second optical splitter through a third optoelectronic composite cable, and electrical signals are transmitted between the optical splitter and the second optical splitter through the third optoelectronic composite cable. In this implementation, the optical splitter can also transmit electrical signals to the optical splitter of the next cascade through the optoelectronic composite cable, thereby improving the scalability of the solution.

[0017] In a second aspect, an embodiment of the present application provides a slave gateway, which includes: a control unit, a sending unit, a receiving unit and a port, wherein the port is connected to a branch port of an optical splitter through an optoelectronic composite cable. Specifically, the control unit is used to generate a first electrical signal. The sending unit is used to transmit the first electrical signal to the port so that the first electrical signal is transmitted from the port to the optical splitter. The receiving unit is used to receive a second electrical signal input from the port and transmit the second electrical signal to the control unit, wherein the second electrical signal comes from the optical splitter.

[0018] In some possible implementations, the first electrical signal is a differential signal, and / or the second electrical signal is a differential signal. It should be understood that, compared with single-ended signals, differential signals have stronger anti-interference capabilities, can effectively suppress EMI, and have the advantage of precise timing positioning.

[0019] In some possible implementations, the slave gateway further includes a power supply, and the power supply voltage from the optoelectronic composite cable is input into the power supply through a port.

[0020] In some possible implementations, the slave gateway further includes an isolation unit, which is connected to the sending unit, the receiving unit, the power supply, and the port, respectively. The isolation unit is used to: isolate the power supply voltage to prevent the power supply voltage from being transmitted to the control unit through the receiving unit; isolate the first electrical signal and the second electrical signal to prevent the first electrical signal and the second electrical signal from being transmitted to the power supply. In this implementation, the power supply voltage and the interacting electrical signal are isolated by the isolation unit, so that the power supply and the electrical signal transmission do not interfere with each other.

[0021] In some possible implementations, the isolation unit includes a coupling capacitor module and an isolation inductor module. The coupling capacitor module is used to isolate the power supply voltage to prevent the power supply voltage from being transmitted to the control unit through the receiving unit. The isolation inductor module is used to isolate the first electrical signal and the second electrical signal to prevent the first electrical signal and the second electrical signal from being transmitted to the power supply.

[0022] In some possible implementations, the first electrical signal carries status information of the slave gateway.

[0023] In some possible implementations, the second electrical signal carries topology information between the optical splitter and the slave gateway.

[0024] In a third aspect, an embodiment of the present application provides a main gateway, which includes: a control unit, a sending unit, a receiving unit and a port, wherein the port is connected to the cascade port of the optical splitter through an optoelectronic composite cable. Specifically, the control unit is used to generate a first electrical signal. The sending unit is used to transmit the first electrical signal to the port so that the first electrical signal is transmitted from the port to the optical splitter. The receiving unit is used to receive a second electrical signal input from the port and transmit the second electrical signal to the control unit, wherein the second electrical signal comes from the optical splitter.

[0025] In some possible implementations, the first electrical signal is a differential signal, and / or the second electrical signal is a differential signal. It should be understood that, compared with single-ended signals, differential signals have stronger anti-interference capabilities, can effectively suppress EMI, and have the advantage of precise timing positioning.

[0026] In some possible implementations, the main gateway further includes a power supply, and the power supply is used to output a power supply voltage, and the power supply voltage is transmitted to the optical splitter through the optical-electrical composite cable.

[0027] In some possible implementations, the main gateway further includes an isolation unit, which is respectively connected to the sending unit, the receiving unit, the power supply, and the port. The isolation unit is used to: isolate the power supply voltage to prevent the power supply voltage from being transmitted to the control unit through the receiving unit. Isolate the first electrical signal and the second electrical signal to prevent the first electrical signal and the second electrical signal from being transmitted to the power supply. In this implementation, the power supply voltage and the interacting electrical signal are isolated by the isolation unit, so that the power supply and the electrical signal transmission do not interfere with each other.

[0028] In some possible implementations, the isolation unit includes a coupling capacitor module and an isolation inductor module. The coupling capacitor module is used to isolate the power supply voltage to prevent the power supply voltage from being transmitted to the control unit through the receiving unit. The isolation inductor module is used to isolate the first electrical signal and the second electrical signal to prevent the first electrical signal and the second electrical signal from being transmitted to the power supply.

[0029] In a fourth aspect, an embodiment of the present application provides a method for transmitting an electrical signal, which is applied to an optical splitter. The optical splitter includes: a control unit, a sending unit, a receiving unit, and N first ports, wherein the N first ports are respectively connected to N slave gateways through a first optoelectronic composite cable, and N is an integer greater than 1. The method includes the following steps: receiving N first electrical signals input from the N first ports respectively through the receiving unit, and transmitting the N first electrical signals to the control unit, wherein the N first electrical signals come from the N slave gateways respectively. Generate a second electrical signal through the control unit. Transmit the second electrical signal to the N first ports through the sending unit, so that the second electrical signals are output from the N first ports to the N slave gateways respectively.

[0030] In some possible implementations, the first electrical signal is a differential signal, and / or the second electrical signal is a differential signal.

[0031] In some possible implementations, the optical splitter further includes a power supply, and the method further includes: outputting a power supply voltage through the power supply, and transmitting the power supply voltage to the N slave gateways through the first optoelectronic composite cable.

[0032] In some possible implementations, the optical splitter further includes an isolation unit, which is respectively connected to the transmitting unit, the receiving unit, the power supply, and the first port, and the method further includes: isolating the power supply voltage through the isolation unit to prevent the power supply voltage from being transmitted to the control unit through the receiving unit. Isolating the first electrical signal and the second electrical signal through the isolation unit to prevent the first electrical signal and the second electrical signal from being transmitted to the power supply.

[0033] In some possible implementations, the isolation unit includes a coupling capacitor module and an isolation inductor module, and the method further includes: isolating the power supply voltage through the coupling capacitor module to prevent the power supply voltage from being transmitted to the control unit through the receiving unit. Isolating the first electrical signal and the second electrical signal through the isolation inductor module to prevent the first electrical signal and the second electrical signal from being transmitted to the power supply.

[0034] In some possible implementations, each first electrical signal carries status information of the slave gateway.

[0035] In some possible implementations, the optical splitter further includes N indicator lights, and the method further includes: controlling the working modes of the N indicator lights respectively according to the status information of the N slave gateways through the control unit, wherein the working modes of the indicator lights are used to reflect the status information of the gateway.

[0036] In some possible implementations, generating the second electrical signal through the control unit includes: generating the second electrical signal through the control unit according to status information of the N slave gateways, wherein the second electrical signal carries topology information between the optical splitter and the N slave gateways.

[0037] In some possible implementations, the optical splitter further includes a first N-to-one switch and a second N-to-one switch, the sending unit is connected to the first N-to-one switch, and the receiving unit is connected to the second N-to-one switch, and the method further includes: controlling the on and off of the first N-to-one switch and the second N-to-one switch by a control unit.

[0038] In some possible implementations, the optical splitter further includes a second port, which is connected to the main gateway or the first optical splitter via a second optoelectronic composite cable, and electrical signals are transmitted between the optical splitter and the main gateway or the first optical splitter via the second optoelectronic composite cable.

[0039] In some possible implementations, the optical splitter further includes a third port, the third port is connected to the second optical splitter via a third optoelectronic composite cable, and electrical signals are transmitted between the optical splitter and the second optical splitter via the third optoelectronic composite cable.

[0040] In a fifth aspect, an embodiment of the present application provides an electrical signal transmission method, which is applied to a slave gateway. The slave gateway includes: a control unit, a sending unit, a receiving unit and a port, wherein the port is connected to a branch port of an optical splitter through an optoelectronic composite cable. The method includes the following steps: generating a first electrical signal by a control unit. Transmitting the first electrical signal to the port through the sending unit so that the first electrical signal is transmitted from the port to the optical splitter. Receive a second electrical signal input from the port through the receiving unit, and transmit the second electrical signal to the control unit, wherein the second electrical signal comes from the optical splitter.

[0041] In some possible implementations, the first electrical signal is a differential signal, and / or the second electrical signal is a differential signal.

[0042] In some possible implementations, the slave gateway further includes a power supply, and the power supply voltage from the optoelectronic composite cable is input into the power supply through a port.

[0043] In some possible implementations, the slave gateway further includes an isolation unit, which is respectively connected to the sending unit, the receiving unit, the power supply, and the port, and the method further includes: isolating the power supply voltage through the isolation unit to prevent the power supply voltage from being transmitted to the control unit through the receiving unit. Isolating the first electrical signal and the second electrical signal through the isolation unit to prevent the first electrical signal and the second electrical signal from being transmitted to the power supply.

[0044] In some possible implementations, the isolation unit includes a coupling capacitor module and an isolation inductor module, and the method further includes: isolating the power supply voltage through the coupling capacitor module to prevent the power supply voltage from being transmitted to the control unit through the receiving unit. Isolating the first electrical signal and the second electrical signal through the isolation inductor module to prevent the first electrical signal and the second electrical signal from being transmitted to the power supply.

[0045] In some possible implementations, the first electrical signal carries status information of the slave gateway.

[0046] In some possible implementations, the second electrical signal carries topology information between the optical splitter and the slave gateway.

[0047] In a sixth aspect, an embodiment of the present application provides an electrical signal transmission method, which is applied to a main gateway. The main gateway includes: a control unit, a sending unit, a receiving unit, and a port, wherein the port is connected to a cascade port of an optical splitter through an optoelectronic composite cable. The method includes the following steps: generating a first electrical signal by a control unit. Transmitting the first electrical signal to the port through the sending unit so that the first electrical signal is transmitted from the port to the optical splitter. Receive a second electrical signal input from the port through the receiving unit, and transmit the second electrical signal to the control unit, wherein the second electrical signal comes from the optical splitter.

[0048] In some possible implementations, the first electrical signal is a differential signal, and / or the second electrical signal is a differential signal.

[0049] In some possible implementations, the main gateway further includes a power supply, and the method further includes: outputting a power supply voltage through the power supply, and transmitting the power supply voltage to the optical splitter through the optoelectronic composite cable.

[0050] In some possible implementations, the main gateway further includes an isolation unit, which is respectively connected to the sending unit, the receiving unit, the power supply, and the port, and the method further includes: isolating the power supply voltage by the isolation unit to prevent the power supply voltage from being transmitted to the control unit through the receiving unit. Isolating the first electrical signal and the second electrical signal by the isolation unit to prevent the first electrical signal and the second electrical signal from being transmitted to the power supply.

[0051] In some possible implementations, the isolation unit includes a coupling capacitor module and an isolation inductor module, and the method further includes: isolating the power supply voltage through the coupling capacitor module to prevent the power supply voltage from being transmitted to the control unit through the receiving unit. Isolating the first electrical signal and the second electrical signal through the isolation inductor module to prevent the first electrical signal and the second electrical signal from being transmitted to the power supply.

[0052] In the embodiment of the present application, the optical splitter and the slave gateway are connected through an optoelectronic composite cable. In this way, in addition to the normal transmission of optical signals between the optical splitter and the slave gateway through the optical fiber in the optoelectronic composite cable, the optical splitter and the slave gateway can also exchange electrical signals through the electrical cable in the optoelectronic composite cable. In other words, without affecting the normal transmission of optical signals, it is equivalent to adding a new channel for interactive information between the optical splitter and the slave gateway, which makes it easier for the optical splitter to obtain the current topology structure in real time based on the information interacted with the slave gateway, thereby effectively managing and maintaining the FTTR network. In addition, this solution can be implemented using the existing optoelectronic composite cables that have been laid, without the need to remodel the optoelectronic composite cables, saving laying costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] Figure 1 This is a schematic diagram of the FTTH system architecture;

[0054] Figure 2 This is a schematic diagram of the system architecture of FTTR;

[0055] Figure 3 This is a schematic diagram of the structure of an optoelectronic composite cable in an embodiment of the present application;

[0056] Figure 4 This is a schematic diagram of a first network structure including an optical splitter and a slave gateway in an embodiment of the present application;

[0057] Figure 5 This is a schematic diagram of a second network structure including an optical splitter and a slave gateway in an embodiment of the present application;

[0058] Figure 6 A schematic diagram of a network structure including a master gateway, an optical splitter and a slave gateway in an embodiment of the present application;

[0059] Figure 7 A schematic diagram of an embodiment of the electrical signal transmission method in the present application. DETAILED DESCRIPTION

[0060] The embodiment of the present application provides an optical splitter, a slave gateway, a master gateway and an electrical signal transmission method. The optical splitter and the slave gateway can also interact with each other through the cable in the optoelectronic composite cable, so that the optical splitter can learn the current topology in real time based on the information interacted with the slave gateway, thereby effectively managing and maintaining the FTTR network. It should be noted that the terms "first", "second", etc. in the specification and claims of this application and the above-mentioned drawings are used to distinguish similar objects, rather than to limit a specific order or sequence. It should be understood that the above terms can be interchangeable where appropriate, so that the embodiments described in this application can be implemented in an order other than the content described in this application. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0061] Passive optical network (PON) is an implementation technology of optical access network. PON is an optical access technology for point-to-multipoint transmission. The current PON system is mainly used in fiber to the home (FTTH) scenarios, and each home user will only have one ONU.

[0062] Figure 1This is a schematic diagram of the system architecture of FTTH. The OLT is connected to the upper network side equipment (such as switches, routers, etc.), and the lower layer is connected to one or more optical distribution networks (ODN). The ODN includes a passive optical splitter for optical power distribution, a trunk optical fiber connected between the passive optical splitter and the OLT, and a branch optical fiber connected between the passive optical splitter and the ONU. When transmitting data downstream, the ODN transmits the downstream data from the OLT to each ONU through the splitter, and the ONU selectively receives the downstream data carrying its own identification. When transmitting data upstream, the ODN combines the optical signals sent by N ONUs into one optical signal and transmits it to the OLT. The ONU provides a user-side interface for the OAN and is connected to the ODN at the same time. If the ONU also provides a user port function, such as the ONU provides an Ethernet user port or a plain old telephone service (POTS) user port, it is called an optical network terminal (ONT).

[0063] On the basis of FTTH, in order to solve the problem of home network WIFI coverage, optical fiber can be further extended to the residents' rooms. ONU is installed inside the room, which shortens the distance between the user terminal and ONU and improves the signal quality. This application scenario is called fiber to the room (FTTR).

[0064] Figure 2 Figure 1 is a schematic diagram of the system architecture of FTTR. The FTTR network and the FTTH network can be regarded as two-level PON systems. The OLT in the first-level PON system (FTTH) is deployed in the central machine room, and the ONU is deployed in the information box of the home. The master gateway in the second-level PON system (FTTR) can replace the ONU in FTTH and be deployed in the information box of the home. The master gateway has similar functions to the OLT in the FTTH scenario in the FTTR scenario, and the master gateway can also have similar functions to the ONU in the FTTH scenario. In other words, the master gateway in the FTTR is a device that has both OLT and ONU functions, and can serve as a network device that connects FTTH and FTTR. The slave gateway in the FTTR can be deployed in each room of the home to connect with the user terminal. The slave gateway and the ONU in the FTTH are essentially the same type of network devices. The difference is that the ONU in the FTTH is generally deployed in the information box, and there is usually an access point (AP) between the user terminal. In FTTR, each room is accessed from a gateway, which also has the function of an AP and can directly establish a WiFi connection with the user terminal.

[0065] It should be understood that multiple slave gateways can be deployed in the FTTR, and each slave gateway is connected to the branch port of the corresponding optical splitter. In addition, the present application does not limit the number of optical splitters in the FTTR, and the master gateway is connected to each optical splitter in a cascade manner. The master gateway can achieve unified management and configuration of all slave gateways. For example, as the control center of the home network, the master gateway can configure the WiFi hotspots of the whole house into a unified network, optimize the channels to avoid interference, and control the roaming and switching of user terminals, reduce network switching time, and improve user experience.

[0066] It should be noted that in the present application, the branch port of the optical splitter is connected to the slave gateway via an optoelectronic composite cable. Optionally, the master gateway and each cascade optical splitter may be connected via an optical cable or an optoelectronic composite cable.

[0067] Figure 3 Schematic diagram of the structure of an optoelectronic composite cable in the embodiment of the present application. Figure 3 As shown, the outer sheath of the optoelectronic composite cable contains an optical cable, cable 1 and cable 2. Among them, the optical cable is used to transmit optical signals, and cable 1 and cable 2 are usually used for power supply. For example, cable 1 and cable 2 are respectively connected to the positive and negative poles of the power supply. It should be noted that in the present application, without affecting the existing power supply function of the optoelectronic composite cable, electrical signals can also be transmitted through the cables in the optoelectronic composite cable. In other words, the optoelectronic composite cable can transmit both optical signals and electrical signals, which is equivalent to adding a new channel for information exchange. The optical splitter, master gateway and slave gateway in the FTTR system are introduced in detail below.

[0068] Figure 4 Schematic diagram of the first network structure including an optical splitter and a slave gateway in the embodiment of the present application. Figure 4 As shown, the optical splitter includes a control unit 101, a sending unit 102, a receiving unit 103 and a branch port 104, for example, the branch port 104 includes port 1-port N. It should be understood that each slave gateway has a similar structure, taking the slave gateway 1 as an example, the slave gateway 1 includes a control unit 201, a sending unit 202, a receiving unit 203 and a port 204. Among them, the N branch ports 104 of the optical splitter are respectively connected to the ports 204 of the N slave gateways through optical-electrical composite cables, for example, the port 1 of the optical splitter is connected to the port of the slave gateway 1 through the optical-electrical composite cable, ..., the port N of the optical splitter is connected to the port of the slave gateway N through the optical-electrical composite cable.

[0069] Specifically, taking slave gateway 1 as an example, the control unit 201 is used to generate a first electrical signal, and the sending unit 202 is used to transmit the first electrical signal to port 204. The first electrical signal is transmitted to port 1 of the optical splitter via the optical-electrical composite cable, and the receiving unit 103 of the optical splitter is used to transmit the first electrical signal input from port 1 to the control unit 101. The control unit 101 of the optical splitter is also used to generate a second electrical signal, and the sending unit 102 is used to transmit the second electrical signal to port 1. The second electrical signal is transmitted to port 204 of slave gateway 1 via the optical-electrical composite cable, and the receiving unit 203 of slave gateway 1 is used to transmit the second electrical signal input from port 204 to the control unit 201.

[0070] It should be noted that if Figure 3 As shown, since two cables are wrapped in the optoelectronic composite cable, the first electrical signal and the second electrical signal interacting between the optical splitter and the slave gateway can be transmitted in the form of differential signals. Of course, in some scenarios, the first electrical signal and the second electrical signal interacting between the optical splitter and the slave gateway can also be in the form of single-ended signals, which are not limited here. It should be understood that differential signals have stronger anti-interference capabilities than single-ended signals, can effectively suppress electromagnetic interference (EMI), and have the advantage of precise timing positioning.

[0071] In some possible implementations, the optical splitter further includes a switch unit 105, wherein the switch unit 105 is used to control the on / off of the electrical signal interaction between the optical splitter and each slave gateway. As an example, the switch unit 105 includes N switches connected to the sending unit 102 and N switches connected to the receiving unit, and the on / off state of each switch is controlled by the control unit 101. As another example, the switch unit 105 includes an N-to-one switch connected to the sending unit 102 and an N-to-one switch connected to the receiving unit 103, and the on / off state of each N-to-one switch is controlled by the control unit 101. It should be understood that the use of an N-to-one switch can effectively simplify the structure of the switch unit 105 and reduce the space occupied by the switch unit 105.

[0072] In a possible scenario, the first electrical signal sent by each slave gateway to the optical splitter carries the status information of the slave gateway, for example, the status information includes but is not limited to the optical power of the slave gateway, the port status of the slave gateway, and the device serial number of the slave gateway, etc. The optical splitter can determine the topology information between the optical splitter and each slave gateway according to the first electrical signal reported by each slave gateway, thereby generating a second electrical signal carrying the topology information.

[0073] It should be noted that, in addition to realizing electrical signal interaction between the optical splitter and the slave gateway, the solution provided in the present application can also be compatible with the optical splitter to power each slave gateway through the optoelectronic composite cable, which is further introduced below.

[0074] Figure 5 FIG. 1 is a schematic diagram of a second network structure including an optical splitter and a slave gateway in an embodiment of the present application. Figure 5 As shown, the optical splitter also includes a power supply 106, an isolation unit 107 and a safety unit 108. Taking the slave gateway 1 as an example, the slave gateway 1 also includes a power supply 205, an isolation unit 206 and a safety unit 207. Specifically, the power supply 106 of the optical splitter is used to output the power supply voltage, and the power supply voltage is output from each branch port 104 to the corresponding slave gateway after passing through the isolation unit 107 and the safety unit 108. Taking the slave gateway 1 as an example, the power supply voltage from the optical splitter is input from the port 204 and transmitted to the power supply 205 through the safety unit 207 and the isolation unit 206. In other words, the optical splitter can be powered locally, and each slave gateway is powered from the optical splitter through an optoelectronic composite cable.

[0075] It should be noted that the safety unit 108 of the optical splitter and the safety unit of the slave gateway both play a role in safety protection. The isolation unit 107 of the optical splitter and the isolation unit 206 of the slave gateway are both used to isolate the power supply voltage and the interacting electrical signal, so as to achieve non-interference between power supply and electrical signal transmission. Specifically, the isolation unit 107 isolates the power supply voltage to prevent the power supply voltage from being transmitted to the control unit 101 through the receiving unit 103; the isolation unit 107 isolates the first electrical signal and the second electrical signal to prevent the first electrical signal and the second electrical signal from being transmitted to the power supply 106. Similarly, the isolation unit 206 isolates the power supply voltage to prevent the power supply voltage from being transmitted to the control unit 201 through the receiving unit 203; the isolation unit 206 isolates the first electrical signal and the second electrical signal to prevent the first electrical signal and the second electrical signal from being transmitted to the power supply 205.

[0076] In a possible implementation, the isolation unit 107 includes a coupling capacitor module and an isolation inductor module, the coupling capacitor module is used to isolate the power supply voltage to prevent the power supply voltage from being transmitted to the control unit 101 through the receiving unit 103; the isolation inductor module is used to isolate the first electrical signal and the second electrical signal to prevent the first electrical signal and the second electrical signal from being transmitted to the power supply 106. Similarly, the isolation unit 206 includes a coupling capacitor module and an isolation inductor module, the coupling capacitor module is used to isolate the power supply voltage to prevent the power supply voltage from being transmitted to the control unit 201 through the receiving unit 203; the isolation inductor module is used to isolate the first electrical signal and the second electrical signal to prevent the first electrical signal and the second electrical signal from being transmitted to the power supply 205.

[0077] In a possible implementation, the optical splitter may further include N indicator lights 109, and the working modes of the N indicator lights 109 are all controlled by the control unit 101. Each indicator light is used to reflect the state of the corresponding slave gateway, for example, indicator light 1 is used to reflect the state of slave gateway 1, and indicator light N is used to reflect the state of slave gateway N. It should be understood that the working modes of the indicator lights include but are not limited to the on and off of the indicator lights, the light color of the indicator lights, and the flashing state of the indicator lights, etc., which are not specifically limited here.

[0078] It should be noted that, in addition to the above-mentioned electrical signal exchange between the optical splitter and the slave gateway, the optical splitter and the master gateway can also transmit electrical signals through the optical-electrical composite cable, and the cascaded optical splitters can also transmit electrical signals through the optical-electrical composite cable. This is further described below.

[0079] Figure 6 FIG. 1 is a schematic diagram of a network structure including a master gateway, an optical splitter and a slave gateway in an embodiment of the present application. Figure 6 As shown, the main gateway includes: a control unit 301, a sending unit 302, a receiving unit 303 and a port 304. Among them, the port 304 of the main gateway is connected to the port 110 of the optical splitter 1 through an optical-electrical composite cable, and the port 111 of the optical splitter 1 is connected to the port 110 of the optical splitter 2 through an optical-electrical composite cable, that is, the main gateway, the optical splitter 1 and the optical splitter 2 are connected in a cascade manner.

[0080] Specifically, the receiving unit 303 of the main gateway is used to transmit the electrical signal from the optical splitter 1 input at the port 304 to the control unit 301, and the sending unit 302 of the main gateway is used to transmit the electrical signal generated by the control unit 301 to the port 304 and output it to the optical splitter 1. The receiving unit 103 of the optical splitter 1 is used to transmit the electrical signal from the main gateway input at the port 110 to the control unit 101, and the sending unit 102 of the optical splitter 1 is used to transmit the electrical signal generated by the control unit 101 to the port 110 and output it to the main gateway. The receiving unit 103 of the optical splitter is also used to transmit the electrical signal from the optical splitter 2 input at the port 111 to the control unit 101, and the sending unit 102 of the optical splitter 1 is also used to transmit the electrical signal generated by the control unit 101 to the port 111 and output it to the optical splitter 2. The receiving unit 103 of the optical splitter 2 is used to transmit the electrical signal input from the optical splitter 1 at the port 110 to the control unit 101 , and the sending unit 102 of the optical splitter 1 is used to transmit the electrical signal generated by the control unit 101 to the port 110 and output it to the optical splitter 1 .

[0081] It should be noted that the present application does not limit the information content of the electrical signal exchange between the master gateway and the optical splitter, nor does it limit the information content of the electrical signal exchange between the cascaded optical splitters. For example, each optical splitter can report the status information of the slave gateway connected to it to the master gateway through an electrical signal. The master gateway generates topology information based on the status information of each slave gateway and sends the topology information to each optical splitter, and each optical splitter then sends the topology information to the corresponding slave gateway. In addition, the electrical signal transmitted between the master gateway and the optical splitter can be in the form of a single-ended signal or a differential signal, which is not specifically limited here.

[0082] In some possible implementations, the solution provided by the present application can not only realize the electrical signal interaction between the main gateway and the optical splitter, but also be compatible with the main gateway to power each optical splitter through an optoelectronic composite cable. For example, the main gateway also includes a power supply 305, an isolation unit 306 and a safety unit 307. The power supply 305 is used to output the power supply voltage, and the power supply voltage is output from the port 304 to the corresponding slave gateway after passing through the isolation unit 306 and the safety unit 307. Among them, the safety unit 307 plays a role in safety protection. The isolation unit 306 is used to isolate the power supply voltage and the interacting electrical signals, so as to achieve non-interference between power supply and electrical signal transmission. It should be understood that in this implementation, the structure of each optical splitter can refer to the above Figure 5 The relevant introduction of the illustrated embodiment will not be repeated here.

[0083] Specifically, the isolation unit 306 isolates the supply voltage to prevent the supply voltage from being transmitted to the control unit 301 through the receiving unit 303; the isolation unit 306 isolates the interactive electrical signals to prevent the interactive electrical signals from being transmitted to the power supply 305. In a possible implementation, the isolation unit 306 includes a coupling capacitor module and an isolation inductor module, the coupling capacitor module is used to isolate the supply voltage to prevent the supply voltage from being transmitted to the control unit 301 through the receiving unit 303; the isolation inductor module is used to isolate the interactive electrical signals to prevent the interactive electrical signals from being transmitted to the power supply 305.

[0084] Based on the above introduction, in the embodiment of the present application, the optical splitter and the slave gateway are connected through an optoelectronic composite cable. In this way, in addition to the normal transmission of optical signals between the optical splitter and the slave gateway through the optical fiber in the optoelectronic composite cable, the optical splitter and the slave gateway can also interact with each other through the electrical cable in the optoelectronic composite cable. In other words, without affecting the normal transmission of optical signals, it is equivalent to adding a new channel for interactive information between the optical splitter and the slave gateway, so that the optical splitter can obtain the current topology structure in real time according to the information interacted with the slave gateway, thereby effectively managing and maintaining the FTTR network. In addition, this solution can be implemented using the existing optoelectronic composite cables that have been laid, without the need to remodel the optoelectronic composite cables, thus saving the laying cost.

[0085] The following is an introduction to the electrical signal transmission method provided in the embodiments of the present application.

[0086] Figure 7 This is a schematic diagram of an embodiment of the electrical signal transmission method in the present application. It should be noted that the electrical signal transmission method can be implemented based on the master gateway, optical splitter or slave gateway introduced above. For the introduction of the master gateway, optical splitter and slave gateway, please refer to the relevant description of the above embodiments, which will not be repeated here. In this example, the electrical signal transmission method includes the following steps.

[0087] 701. Receive a first electrical signal input from a port through a receiving unit, and transmit the electrical signal to a control unit.

[0088] In one possible implementation, the master gateway may receive a first electrical signal from an optical splitter input from a port through a receiving unit. In another possible implementation, the optical splitter may receive a first electrical signal from a master gateway, a slave gateway, or an optical splitter cascaded therewith input from a port through a receiving unit. In yet another possible implementation, the slave gateway may receive a first electrical signal from an optical splitter input from a port through a receiving unit. It should be understood that the present application does not limit the information carried by the interactive electrical signals between the master gateway and the optical splitter, nor does it limit the information carried by the interactive electrical signals between the optical splitter and the slave gateway.

[0089] 702. Generate a second electrical signal by a control unit.

[0090] In one possible implementation, the control unit of the master gateway generates a second electrical signal based on the received first electrical signal, for example, the first electrical signal carries the status information of each slave gateway, and the second electrical signal carries the topology information. In another possible implementation, the control unit of the optical splitter generates a second electrical signal based on the received first electrical signal, for example, the first electrical signal carries the status information of each slave gateway, and the second electrical signal carries the topology information. In yet another possible implementation, the control unit of the slave gateway generates a second electrical signal based on its own status information. It should be understood that the status information of the slave gateway includes, but is not limited to, the optical power of the slave gateway, the port status of the slave gateway, and the device serial number of the slave gateway.

[0091] 703. Transmit the second electrical signal to the port through the sending unit.

[0092] In one possible implementation, the second electrical signal sent by the master gateway is transmitted to the optical splitter through a port. In another possible implementation, the second electrical signal sent by the optical splitter is transmitted to the slave gateway, the master gateway, or an optical splitter cascaded therewith through a port. In yet another possible implementation, the second electrical signal sent by the slave gateway is transmitted to the optical splitter through a port.

[0093] It should be noted that the power supply voltage output by the power supply of the main gateway can be used to power the optical splitter through an optoelectronic composite cable. Similarly, the power supply voltage output by the power supply of the optical splitter can be used to power the slave gateway through an optoelectronic composite cable. In addition, an isolation unit is also provided in the main gateway, the optical splitter and the slave gateway, and the power supply voltage and the interacting electrical signal are isolated by the isolation unit, so as to achieve non-interference between power supply and electrical signal transmission. For the introduction of the isolation unit, please refer to the relevant introduction of the above embodiment, which will not be repeated here.

[0094] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application is described in detail with reference to the above embodiments, a person skilled in the art should understand that the technical solutions described in the above embodiments can still be modified, or some of the technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. An optical splitter, characterized in that: include: A control unit, a sending unit, a receiving unit and N first ports, wherein the N first ports are respectively connected to N slave gateways through first optoelectronic composite cables, and N is an integer greater than 1; The receiving unit is used to receive N first electrical signals input from the N first ports respectively, and transmit the N first electrical signals to the control unit, wherein the N first electrical signals come from the N slave gateways respectively; The control unit is used to generate a second electrical signal, where the second electrical signal carries topology information between the optical splitter and the N slave gateways; The sending unit is used to transmit the second electrical signal to the N first ports, so that the second electrical signal is output from the N first ports to the N slave gateways respectively.

2. The optical splitter according to claim 1, characterized in that: The first electrical signal is a differential signal, and / or the second electrical signal is a differential signal.

3. The optical splitter according to claim 1, characterized in that: The optical splitter also includes a power supply, which is used to output a power supply voltage. The power supply voltage is transmitted to the N slave gateways through the first optoelectronic composite cable.

4. The optical splitter according to claim 3, characterized in that: The optical splitter further includes an isolation unit, which is connected to the sending unit, the receiving unit, the power supply and the first port respectively, and is used for: isolating the supply voltage to prevent the supply voltage from being transmitted to the control unit through the receiving unit; The first electrical signal and the second electrical signal are isolated to prevent the first electrical signal and the second electrical signal from being transmitted to the power supply.

5. The optical splitter according to claim 4, characterized in that: The isolation unit includes a coupling capacitor module and an isolation inductor module; The coupling capacitor module is used to isolate the supply voltage to prevent the supply voltage from being transmitted to the control unit through the receiving unit; The isolation inductor module is used to isolate the first electrical signal and the second electrical signal to prevent the first electrical signal and the second electrical signal from being transmitted to the power supply.

6. The optical splitter according to any one of claims 1 to 5, characterized in that: Each of the first electrical signals carries status information of the slave gateway.

7. The optical splitter according to claim 6, characterized in that: The optical splitter also includes N indicator lights, and the control unit is further used to control the working modes of the N indicator lights respectively according to the status information of the N slave gateways, wherein the working modes of the indicator lights are used to reflect the status information of the gateway.

8. The optical splitter according to claim 6, characterized in that: The control unit is specifically configured to generate the second electrical signal according to the status information of the N slave gateways.

9. The optical splitter according to any one of claims 1 to 5, characterized in that: The optical splitter also includes a first N-to-one switch and a second N-to-one switch, the sending unit is connected to the first N-to-one switch, the receiving unit is connected to the second N-to-one switch, and the control unit is used to control the on and off of the first N-to-one switch and the second N-to-one switch.

10. The optical splitter according to any one of claims 1 to 5, characterized in that: The optical splitter also includes a second port, which is connected to the main gateway or the first optical splitter through a second optoelectronic composite cable, and electrical signals are transmitted between the optical splitter and the main gateway or the first optical splitter through the second optoelectronic composite cable.

11. The optical splitter according to any one of claims 1 to 5, characterized in that: The optical splitter further comprises a third port, the third port is connected to the second optical splitter via a third optoelectronic composite cable, and electrical signals are transmitted between the optical splitter and the second optical splitter via the third optoelectronic composite cable.

12. A slave gateway, characterized in that: include: A control unit, a sending unit, a receiving unit and a port, wherein the port is connected to a branch port of an optical splitter via an optoelectronic composite cable; The control unit is used to generate a first electrical signal; The sending unit is used to transmit the first electrical signal to the port, so that the first electrical signal is transmitted from the port to the optical splitter; The receiving unit is used to receive a second electrical signal input from the port and transmit the second electrical signal to the control unit, wherein the second electrical signal comes from the optical splitter and carries topology information between the optical splitter and the slave gateway.

13. The slave gateway according to claim 12, characterized in that: The first electrical signal is a differential signal, and / or the second electrical signal is a differential signal.

14. The slave gateway according to claim 12, characterized in that: The slave gateway further includes a power supply, and the power supply voltage from the optoelectronic composite cable is input into the power supply through the port.

15. The slave gateway according to claim 14, characterized in that: The slave gateway further includes an isolation unit, which is connected to the sending unit, the receiving unit, the power supply and the port respectively, and is used for: isolating the supply voltage to prevent the supply voltage from being transmitted to the control unit through the receiving unit; The first electrical signal and the second electrical signal are isolated to prevent the first electrical signal and the second electrical signal from being transmitted to the power supply.

16. The slave gateway according to claim 15, characterized in that: The isolation unit includes a coupling capacitor module and an isolation inductor module; The coupling capacitor module is used to isolate the supply voltage to prevent the supply voltage from being transmitted to the control unit through the receiving unit; The isolation inductor module is used to isolate the first electrical signal and the second electrical signal to prevent the first electrical signal and the second electrical signal from being transmitted to the power supply.

17. The slave gateway according to any one of claims 12 to 16, characterized in that: The first electrical signal carries status information of the slave gateway.

18. A main gateway, characterized in that: include: A control unit, a sending unit, a receiving unit and a port, wherein the port is connected to a cascade port of an optical splitter via an optoelectronic composite cable; The control unit is used to generate a first electrical signal; The sending unit is used to transmit the first electrical signal to the port, so that the first electrical signal is transmitted from the port to the optical splitter; The receiving unit is used to receive a second electrical signal input from the port and transmit the second electrical signal to the control unit, wherein the second electrical signal comes from the optical splitter and carries topology information between the optical splitter and N slave gateways.

19. The master gateway according to claim 18, characterized in that: The first electrical signal is a differential signal, and / or the second electrical signal is a differential signal.

20. The master gateway according to claim 18 or 19, characterized in that: The main gateway also includes a power supply, which is used to output a power supply voltage, and the power supply voltage is transmitted to the optical splitter through the optoelectronic composite cable.

21. The master gateway according to claim 20, characterized in that: The main gateway further includes an isolation unit, which is connected to the sending unit, the receiving unit, the power supply and the port respectively, and is used for: isolating the supply voltage to prevent the supply voltage from being transmitted to the control unit through the receiving unit; The first electrical signal and the second electrical signal are isolated to prevent the first electrical signal and the second electrical signal from being transmitted to the power supply.

22. The master gateway according to claim 21, characterized in that: The isolation unit includes a coupling capacitor module and an isolation inductor module; The coupling capacitor module is used to isolate the supply voltage to prevent the supply voltage from being transmitted to the control unit through the receiving unit; The isolation inductor module is used to isolate the first electrical signal and the second electrical signal to prevent the first electrical signal and the second electrical signal from being transmitted to the power supply.

23. A method for transmitting an electrical signal, characterized in that: The method is applied to an optical splitter, which includes: a control unit, a sending unit, a receiving unit and N first ports, wherein the N first ports are respectively connected to N slave gateways through first optoelectronic composite cables, and N is an integer greater than 1; the method includes: Receiving, by the receiving unit, N first electrical signals respectively input from the N first ports, and transmitting the N first electrical signals to the control unit, wherein the N first electrical signals respectively come from the N slave gateways; Generate a second electrical signal by the control unit, wherein the second electrical signal carries topology information between the optical splitter and the N slave gateways; The second electrical signal is transmitted to the N first ports through the sending unit, so that the second electrical signal is output from the N first ports to the N slave gateways respectively.

24. The method according to claim 23, characterized in that The first electrical signal is a differential signal, and / or the second electrical signal is a differential signal.

25. The method according to claim 23, characterized in that The optical splitter further includes a power supply, and the method further includes: The power supply outputs a power supply voltage, and the power supply voltage is transmitted to the N slave gateways through the first optoelectronic composite cable.

26. The method according to claim 25, characterized in that The optical splitter further includes an isolation unit, and the isolation unit is respectively connected to the sending unit, the receiving unit, the power supply and the first port. The method further includes: isolating the supply voltage by the isolation unit to prevent the supply voltage from being transmitted to the control unit through the receiving unit; The first electrical signal and the second electrical signal are isolated by the isolation unit to prevent the first electrical signal and the second electrical signal from being transmitted to the power supply.

27. The method according to claim 26, characterized in that The isolation unit includes a coupling capacitor module and an isolation inductor module, and the method further includes: The power supply voltage is isolated by the coupling capacitor module to prevent the power supply voltage from being transmitted to the control unit through the receiving unit; The first electrical signal and the second electrical signal are isolated by the isolation inductor module to prevent the first electrical signal and the second electrical signal from being transmitted to the power supply.

28. The method according to any one of claims 23 to 27, characterized in that Each of the first electrical signals carries status information of the slave gateway.

29. The method according to claim 28, characterized in that The optical splitter further includes N indicator lights, and the method further includes: The working modes of the N indicator lights are respectively controlled by the control unit according to the status information of the N slave gateways, wherein the working modes of the indicator lights are used to reflect the status information of the gateway.

30. The method according to claim 28, characterized in that Generating the second electrical signal by the control unit includes: The second electrical signal is generated by the control unit according to the status information of the N slave gateways.

31. The method according to any one of claims 23 to 27, characterized in that The optical splitter further includes a first N-to-one switch and a second N-to-one switch, the sending unit is connected to the first N-to-one switch, and the receiving unit is connected to the second N-to-one switch, and the method further includes: The first N-to-one switch and the second N-to-one switch are controlled to be turned on and off by the control unit.

32. The method according to any one of claims 23 to 27, characterized in that The optical splitter also includes a second port, which is connected to the main gateway or the first optical splitter through a second optoelectronic composite cable, and electrical signals are transmitted between the optical splitter and the main gateway or the first optical splitter through the second optoelectronic composite cable.

33. The method according to any one of claims 23 to 27, characterized in that The optical splitter further comprises a third port, the third port is connected to the second optical splitter via a third optoelectronic composite cable, and electrical signals are transmitted between the optical splitter and the second optical splitter via the third optoelectronic composite cable.

34. A method for transmitting an electrical signal, characterized in that: The method is applied to a slave gateway, the slave gateway comprising: a control unit, a sending unit, a receiving unit and a port, wherein the port is connected to a branch port of an optical splitter through an optoelectronic composite cable; the method comprises: generating a first electrical signal by the control unit; Transmitting the first electrical signal to the port through the sending unit, so that the first electrical signal is transmitted from the port to the optical splitter; A second electrical signal input from the port is received by the receiving unit, and the second electrical signal is transmitted to the control unit, wherein the second electrical signal comes from the optical splitter and carries topology information between the optical splitter and the slave gateway.

35. The method according to claim 34, characterized in that The first electrical signal is a differential signal, and / or the second electrical signal is a differential signal.

36. The method according to claim 34, characterized in that The slave gateway further includes a power supply, and the power supply voltage from the optoelectronic composite cable is input into the power supply through the port.

37. The method according to claim 36, characterized in that The slave gateway further includes an isolation unit, and the isolation unit is respectively connected to the sending unit, the receiving unit, the power supply, and the port. The method further includes: isolating the supply voltage by the isolation unit to prevent the supply voltage from being transmitted to the control unit through the receiving unit; The first electrical signal and the second electrical signal are isolated by the isolation unit to prevent the first electrical signal and the second electrical signal from being transmitted to the power supply.

38. The method according to claim 37, characterized in that The isolation unit includes a coupling capacitor module and an isolation inductor module, and the method further includes: The power supply voltage is isolated by the coupling capacitor module to prevent the power supply voltage from being transmitted to the control unit through the receiving unit; The first electrical signal and the second electrical signal are isolated by the isolation inductor module to prevent the first electrical signal and the second electrical signal from being transmitted to the power supply.

39. The method according to any one of claims 34 to 38, characterized in that The first electrical signal carries status information of the slave gateway.

40. An electrical signal transmission method, characterized in that: The method is applied to a main gateway, which includes: a control unit, a sending unit, a receiving unit and a port, wherein the port is connected to a cascade port of an optical splitter through an optoelectronic composite cable; the method includes: generating a first electrical signal by the control unit; Transmitting the first electrical signal to the port through the sending unit, so that the first electrical signal is transmitted from the port to the optical splitter; A second electrical signal input from the port is received by the receiving unit, and the second electrical signal is transmitted to the control unit, wherein the second electrical signal comes from the optical splitter and carries topology information between the optical splitter and N slave gateways.

41. The method according to claim 40, characterized in that The first electrical signal is a differential signal, and / or the second electrical signal is a differential signal.

42. The method according to claim 40 or 41, characterized in that The master gateway further includes a power supply, and the method further includes: The power supply outputs a supply voltage, and the supply voltage is transmitted to the optical splitter through the optoelectronic composite cable.

43. The method according to claim 42, characterized in that The main gateway further includes an isolation unit, and the isolation unit is respectively connected to the sending unit, the receiving unit, the power supply, and the port. The method further includes: isolating the supply voltage by the isolation unit to prevent the supply voltage from being transmitted to the control unit through the receiving unit; The first electrical signal and the second electrical signal are isolated by the isolation unit to prevent the first electrical signal and the second electrical signal from being transmitted to the power supply.

44. The method according to claim 43, characterized in that The isolation unit includes a coupling capacitor module and an isolation inductor module, and the method further includes: The power supply voltage is isolated by the coupling capacitor module to prevent the power supply voltage from being transmitted to the control unit through the receiving unit; The first electrical signal and the second electrical signal are isolated by the isolation inductor module to prevent the first electrical signal and the second electrical signal from being transmitted to the power supply.

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