Energy-saving optical fiber interface circuit for Ethernet management switch

Abstract

The utility model relates to the technical field of switches, in particular to an energy-saving optical fiber interface circuit for an Ethernet management type switch, which comprises a module interface functional circuit and a module light source transmitter power supply circuit connected with the module interface functional circuit. The module interface function circuit comprises an interface chip U1 used for being connected with an optical module. The interface chip is provided with a TXDISABLE pin, an MODABS pin, an RXLOS pin, a module RD signal exchange pin, a module TD signal exchange pin, a VCCR pin and a VCCT pin. The module light source transmitter power supply circuit comprises a triode Q2, a switch tube Q1 and a resistor R9. A power supply of a light source power supply pin of the light module is automatically controlled to be turned on or off by judging whether a light signal exists in a light receiving direction, so that energy-saving design is realized; module power supply time is reduced and module service life is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of switches, in particular to an energy-saving optical fiber interface circuit for an Ethernet management switch. Background Art

[0002] With the rapid development of Ethernet technology, the performance and energy efficiency of managed switches, as core devices in network architecture, are increasingly attracting attention. In switches, the fiber optic interface circuit is a key component for connecting to fiber optic networks, and its design is directly related to the reliability of data transmission and the overall energy efficiency of the device.

[0003] Traditional fiber optic interface circuits are relatively simple in terms of optical module management and control, and usually only have basic connection and signal transmission functions. However, in practical applications, the working status of the optical module (such as whether it receives an optical signal) often directly affects its energy consumption and life. If the optical module continues to operate at full power when it does not receive an optical signal for a long time, it will not only waste a lot of energy, but also accelerate the aging of the optical module and shorten its service life. Summary of the invention

[0004] The utility model aims at solving the problems of the prior art and provides an energy-saving optical fiber interface circuit for an Ethernet management switch. The circuit automatically controls the power on or off of the light source power supply pin of the optical module by judging whether there is an optical signal in the light receiving direction, so as to realize energy-saving design; reduce the power supply time of the module and extend the service life of the module; further, the temperature rise of the module can be reduced when the module enters the standby mode, thereby reducing the temperature rise of the whole machine, saving energy and being environmentally friendly.

[0005] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0006] The utility model provides an energy-saving optical fiber interface circuit for an Ethernet management switch, which comprises a module interface function circuit and a module light source transmitter power supply circuit connected to the module interface function circuit;

[0007] The module interface function circuit includes an interface chip U1 for connecting the optical module, and the interface chip U1 is provided with a TX_DISABLE pin, a MOD_ABS pin, a RX_LOS pin, a module RD signal exchange pin, a module TD signal exchange pin, a VCCR pin and a VCCT pin;

[0008] The module RD signal exchange pins include RD-pin and RD+ pin, and the module TD signal exchange pins include TD-pin and TD+ pin;

[0009] The module light source transmitter power supply circuit includes a transistor Q2, a switch tube Q1 and a resistor R19, the RX_LOS pin is connected to the base of the transistor Q2, the emitter of the transistor Q2 is connected to one end of the resistor R19, the other end of the resistor R19 is connected to the gate of the switch tube Q1, the collector of the transistor Q2 is connected to the source of the switch tube Q1, the VCCT pin is connected to the drain of the switch tube Q1, and the VCCR pin is connected to the source of the switch tube Q1;

[0010] The module interface function circuit further includes a resistor R1 , and the interface chip U1 is provided with a TX_DISABLE pin, the TX_DISABLE pin is connected to one end of the resistor R1 , and the other end of the resistor R1 is grounded.

[0011] Among them, the module light source transmitter power supply circuit also includes a resistor R16, a resistor R18, a resistor R20, a resistor R21, a capacitor C7 and a capacitor C8, the RX_LOS pin is connected to the base of the transistor Q2 through the resistor R18, the emitter of the transistor Q2 is respectively connected to one end of the resistor R19 and one end of the resistor R20, the other end of the resistor R20 is grounded, the gate of the switch tube Q1 is respectively connected to the other end of the resistor R19, one end of the capacitor C8, one end of the capacitor C7 and one end of the resistor R21, the other end of the capacitor C8 is grounded, the source of the switch tube Q1 is respectively connected to the other end of the resistor R21, the other end of the capacitor C7 and the collector of the transistor Q2, and the two ends of the resistor R16 are respectively connected to the source and drain of the switch tube Q1.

[0012] The model of the chip U1 is SPF_CAGE.

[0013] Among them, the module interface functional circuit also includes inductor L1, capacitor C1, capacitor C2, capacitor C3 and anti-static TVS tube ESD1, the VCCR pin is connected to one end of the inductor L1, one end of the capacitor C2, one end of the capacitor C3, and one end of the anti-static TVS tube ESD1, the other end of the inductor L1 is connected to one end of the capacitor C1 and the source of the switch tube Q1, and the other end of the capacitor C1, the other end of the capacitor C2, the other end of the capacitor C3 and the other end of the anti-static TVS tube ESD1 are grounded respectively.

[0014] Among them, the module interface functional circuit also includes inductor L2, capacitor C4, capacitor C5, capacitor C6 and anti-static TVS tube ESD2, the VCCT pin is connected to one end of the inductor L2, one end of the capacitor C5, one end of the capacitor C6, and one end of the anti-static TVS tube ESD2, the other end of the inductor L2 is connected to one end of the capacitor C4 and the drain of the switch tube Q1, and the other end of the capacitor C4, the other end of the capacitor C5, the other end of the capacitor C6 and the other end of the anti-static TVS tube ESD2 are grounded respectively.

[0015] Beneficial effects of the utility model:

[0016] The module interface function circuit in the utility model is used for the connection between the optical module and the switch device, and is required for the normal operation of the optical module; after the optical module is inserted into the module interface function circuit, when the optical module receives a sufficiently strong optical signal, the module interface RX_LOS pin of the interface chip U1 outputs a low level, driving the transistor Q2 to be cut off, at which time the emitter of the transistor Q2 is at a low level, the switch tube Q1 will be turned on, and the optical module light source power supply pin VCCT pin will be powered; the low level signal of the RX_LOS pin is connected to the interface chip U1 at the same time, and after the interface chip U1 detects this signal, it outputs a TX_DISABLE low level signal to control the optical module to turn on the transmitter, and the optical module starts to work normally to send optical signals outward to achieve two-way communication; when the optical module does not receive the optical signal When the RX_LOS pin of the interface chip U1 outputs a high level, driving the transistor Q2 to turn on. At this time, the emitter of the transistor Q2 is at a high level, the switch tube Q1 will be turned off, and the VCCT pin of the optical module light source power supply pin will stop supplying power; after the interface chip U1 detects this high level, it outputs a TX_DISABLE high level signal to control the optical module to turn off the transmitter, and the optical module stops sending optical signals to the outside. At this time, the optical module begins to enter a low-power standby mode; therefore, the utility model automatically controls the power supply pin of the optical module light source to turn on or off by judging whether there is an optical signal in the light receiving direction, so as to realize energy-saving design; reduce the power supply time of the module and extend the service life of the module; further, the module entering the standby mode can reduce the temperature rise of the module, thereby reducing the temperature rise of the whole machine, saving energy and being environmentally friendly. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The utility model is a circuit diagram of an energy-saving optical fiber interface circuit for an Ethernet management switch. DETAILED DESCRIPTION

[0018] In order to facilitate the understanding of those skilled in the art, the present invention is further described below in conjunction with the embodiments and drawings, and the contents mentioned in the implementation modes are not intended to limit the present invention. The present invention is described in detail below in conjunction with the drawings.

[0019] An energy-saving optical fiber interface circuit for an Ethernet managed switch, such as Figure 1 As shown, it includes a module interface function circuit and a module light source transmitter power supply circuit connected to the module interface function circuit; the module interface function circuit includes an interface chip U1 for connecting the optical module, and the interface chip U1 is provided with a TX_DISABLE pin, a MOD_ABS pin, a RX_LOS pin, a module RD signal exchange pin, a module TD signal exchange pin, a VCCR pin and a VCCT pin;

[0020] The module RD signal exchange pin includes an RD-pin and an RD+ pin, and the module TD signal exchange pin includes a TD-pin and a TD+ pin;

[0021] The module light source transmitter power supply circuit includes a transistor Q2, a switch tube Q1 and a resistor R19, the RX_LOS pin is connected to the base of the transistor Q2, the emitter of the transistor Q2 is connected to one end of the resistor R19, the other end of the resistor R19 is connected to the gate of the switch tube Q1, the collector of the transistor Q2 is connected to the source of the switch tube Q1, the VCCT pin is connected to the drain of the switch tube Q1, and the VCCR pin is connected to the source of the switch tube Q1; wherein the model of the chip U1 is SPF_CAGE.

[0022] Specifically, the module interface function circuit in the utility model is used for the connection between the optical module and the switch device, and is required for the normal operation of the optical module; after the optical module is inserted into the module interface function circuit, when the optical module receives a sufficiently strong optical signal, the module interface RX_LOS pin of the interface chip U1 outputs a low level, driving the transistor Q2 to be cut off. At this time, the emitter of the transistor Q2 is at a low level, so that the Vgs (gate-source voltage) of the switch tube Q1 is approximately equal to 3V and greater than Vgsth (threshold voltage 0.9V), and the switch tube Q1 (PMOS) will be turned on, and the VCCT pin of the optical module light source power supply pin is powered; the low level signal of the RX_LOS pin is simultaneously connected to the interface chip The interface chip U1 has a GPIO port. After the interface chip U1 detects this signal, it outputs a TX_DISABLE low-level signal from another GPIO port to control the optical module to turn on the transmitter. The optical module starts to work normally and sends optical signals to the outside to achieve two-way communication. When the optical module does not receive the optical signal, the RX_LOS pin of the interface chip U1 outputs a high level to drive the transistor Q2 to turn on. At this time, the emitter of the transistor Q2 is at a high level, making the Vgs (gate-source voltage) of the switch tube Q1 (PMOS) approximately equal to 0V and less than Vgsth (threshold voltage 0.9V). The switch tube Q1 (PMOS) will be turned off, and the VCCT pin of the optical module light source power supply will stop supplying power. After the interface chip U1 detects this high level, the GPIO port outputs the TX_DISABLE high level signal to control the optical module to turn off the transmitter, and the optical module stops sending optical signals to the outside. At this time, the optical module begins to enter the low-power standby mode; therefore, the utility model automatically controls the power supply pin of the optical module light source to turn on or off by judging whether there is an optical signal in the light receiving direction, so as to realize energy-saving design; reduce the power supply time of the module and extend the service life of the module; further, the module entering the standby mode can reduce the temperature rise of the module, thereby reducing the temperature rise of the whole machine, saving energy and being environmentally friendly.

[0023] In an embodiment of the present application, the module light source transmitter power supply circuit also includes a resistor R16, a resistor R18, a resistor R20, a resistor R21, a capacitor C7 and a capacitor C8. The RX_LOS pin is connected to the base of the transistor Q2 through the resistor R18, and the emitter of the transistor Q2 is respectively connected to one end of the resistor R19 and one end of the resistor R20, and the other end of the resistor R20 is grounded. The gate of the switch tube Q1 is respectively connected to the other end of the resistor R19, one end of the capacitor C8, one end of the capacitor C7 and one end of the resistor R21, and the other end of the capacitor C8 is grounded. The source of the switch tube Q1 is respectively connected to the other end of the resistor R21, the other end of the capacitor C7 and the collector of the transistor Q2, and the two ends of the resistor R16 are respectively connected to the source and drain of the switch tube Q1.

[0024] Specifically, the interface chip U1 is an optical module interface socket, which is used to connect the optical module; the 3rd pin is the TX_DISABLE pin, which is used to control the optical module to turn on or off the transmitter laser output; the 6th pin is the MOD_ABS pin, which is used to detect whether the optical module is connected and determine whether the interface has been inserted into the optical module; the 8th pin is the RX_LOS pin, which is the module laser signal detection output; the 12th, 13th, 18th, and 19th pins are used for module RD and TD signal exchange; the 15th pin is the module VCCR power supply pin, and the 16th pin is the module VCCT laser transmitter power supply pin.

[0025] When the module is inserted into the interface, the MOD_ABS pin is at a low level, and this low level is transmitted to the GPIO port of the interface chip U1, and the interface chip U1 determines that the module has been inserted; conversely, when the module is removed or not inserted, the MOD_ABS pin is at a high level, and this high level is transmitted to the GPIO port of the interface chip U1, and the interface chip U1 determines that the module has been removed or not inserted.

[0026] When the optical module is inserted, if the optical module receives a strong enough optical signal, the RX_LOS pin of the interface chip U1 outputs a low level. At this time, the B pole of the NPN transistor Q2 is at a low level, and the transistor is cut off. At this time, the E pole of the transistor is at a low level, so that the Vgs (gate-source voltage) of the PMOS tube Q1 is approximately equal to 3V and greater than Vgsth (threshold voltage 0.9V), and the PMOS tube Q1 will be turned on, and the optical module light source power supply pin VCCT will be powered; the signal of the RX_LOS pin is connected to the chip GPIO port at the same time. After the interface chip U1 detects this signal, it outputs a low-level signal of the TX_DISABLE pin from another GPIO port to control the optical module to turn on the transmitter to emit laser; the optical module starts to work normally and sends optical signals to the outside to achieve two-way communication. On the contrary, when the optical module does not receive the optical signal, the RX_LOS pin of the interface chip U1 outputs a high level. At this time, the B pole of the NPN transistor Q2 will also turn to a high level, and the transistor is turned on. At this time, the E pole of the transistor is a high level, making the Vgs (gate-source voltage) of the PMOS tube Q1 approximately equal to 0V and less than Vgsth (threshold voltage 0.9V), and the PMOS tube Q1 will be turned off, and the optical module light source power supply pin VCCT stops supplying power. After the interface chip U1 detects that the RX_LOS signal is high, it controls the TX_DISABLE pin of the optical module to output a high level to turn off the transmitter. The optical module transmitter will stop sending optical signals outward, and the optical module begins to enter low-power standby mode.

[0027] The circuit of the embodiment of the present application controls the conduction or stopping of the transistor Q2 by judging the level state of the RX_LOS pin signal, and indirectly controls the conduction or stopping of the switch tube Q1 to control the power supply of the optical module laser transmitter. When no light source is received and no signal exchange is performed, the laser transmitter is turned off and enters the standby mode, thereby achieving the effect of energy saving and environmental protection, and at the same time, the power supply time of the laser transmitter can be significantly reduced, the service life of the module laser transmitter can be extended, and the temperature rise of the whole machine can be appropriately reduced.

[0028] Among them, capacitor C7 is a gate-source capacitor, which is used to cooperate with the switch tube Q2 (PMOS) to stabilize its state. Its charging and discharging process will help the switch tube Q2 (PMOS) to achieve fast shutdown and conduction. Capacitor C8 is used to improve the rise time of the G pole power supply of the switch tube Q2 (PMOS) to prevent the sudden change of the power supply from affecting the MOS tube.

[0029] In the embodiment of the present application, the module interface function circuit further includes a resistor R1, and the interface chip U1 is provided with a TX_DISABLE pin, the TX_DISABLE pin is connected to one end of the resistor R1, and the other end of the resistor R1 is grounded. Specifically, under the above settings, the resistor R1 and the resistor R16 are standby resistors. When the optical module does not need to be managed, the resistor R1 forces the TX_DISABLE pin to a low level, and the optical module laser transmitter will always be in a working state; and the resistor R16 will keep the VCCT pin of the optical module laser transmitter in a power supply state.

[0030] In the embodiment of the present application, the module interface functional circuit also includes an inductor L1, a capacitor C1, a capacitor C2, a capacitor C3 and an anti-static TVS tube ESD1, the VCCR pin is connected to one end of the inductor L1, one end of the capacitor C2, one end of the capacitor C3, and one end of the anti-static TVS tube ESD1, the other end of the inductor L1 is connected to one end of the capacitor C1 and the source of the switch tube Q1, the other end of the capacitor C1, the other end of the capacitor C2, the other end of the capacitor C3 and the other end of the anti-static TVS tube ESD1 are respectively Grounding; wherein the module interface functional circuit also includes inductor L2, capacitor C4, capacitor C5, capacitor C6 and anti-static TVS tube ESD2, the VCCT pin is connected to one end of inductor L2, one end of capacitor C5, one end of capacitor C6, and one end of anti-static TVS tube ESD2, the other end of inductor L2 is connected to one end of capacitor C4 and the drain of switch tube Q1, and the other end of capacitor C4, the other end of capacitor C5, the other end of capacitor C6 and the other end of anti-static TVS tube ESD2 are grounded respectively. Specifically, capacitor C1, capacitor C2, capacitor C3, inductor L1 and capacitor C4, capacitor C5, capacitor C6, inductor L2 are two groups of LC filter circuits respectively, and anti-static TVS tube ESD1 and anti-static TVS tube ESD2 play an anti-static effect.

[0031] The above is only a preferred embodiment of the utility model, and does not limit the utility model in any form. Although the utility model is disclosed as a preferred embodiment as above, it is not used to limit the utility model. Any technician familiar with this profession can make some changes or modifications to equivalent embodiments of equivalent changes by using the technical content disclosed above without departing from the scope of the technical solution of the utility model. However, any simple modification, equivalent change and modification made to the above embodiments according to the technology of the utility model, which does not depart from the content of the technical solution of the utility model, belongs to the scope of the technical solution of the utility model.

Claims

1. An energy-saving optical fiber interface circuit for an Ethernet managed switch, characterized in that: It includes a module interface functional circuit and a module light source transmitter power supply circuit connected to the module interface functional circuit; The module interface function circuit includes an interface chip U1 for connecting the optical module, and the interface chip U1 is provided with a TX_DISABLE pin, a MOD_ABS pin, a RX_LOS pin, a module RD signal exchange pin, a module TD signal exchange pin, a VCCR pin and a VCCT pin; The module RD signal exchange pins include RD-pin and RD+ pin, and the module TD signal exchange pins include TD-pin and TD+ pin; The module light source transmitter power supply circuit includes a transistor Q2, a switch tube Q1 and a resistor R19, the RX_LOS pin is connected to the base of the transistor Q2, the emitter of the transistor Q2 is connected to one end of the resistor R19, the other end of the resistor R19 is connected to the gate of the switch tube Q1, the collector of the transistor Q2 is connected to the source of the switch tube Q1, the VCCT pin is connected to the drain of the switch tube Q1, and the VCCR pin is connected to the source of the switch tube Q1; The module interface function circuit further includes a resistor R1 , and the interface chip U1 is provided with a TX_DISABLE pin, the TX_DISABLE pin is connected to one end of the resistor R1 , and the other end of the resistor R1 is grounded.

2. The energy-saving optical fiber interface circuit for an Ethernet managed switch according to claim 1, characterized in that: The module light source transmitter power supply circuit also includes a resistor R16, a resistor R18, a resistor R20, a resistor R21, a capacitor C7 and a capacitor C8. The RX_LOS pin is connected to the base of the transistor Q2 through the resistor R18. The emitter of the transistor Q2 is respectively connected to one end of the resistor R19 and one end of the resistor R20, and the other end of the resistor R20 is grounded. The gate of the switch tube Q1 is respectively connected to the other end of the resistor R19, one end of the capacitor C8, one end of the capacitor C7 and one end of the resistor R21, and the other end of the capacitor C8 is grounded. The source of the switch tube Q1 is respectively connected to the other end of the resistor R21, the other end of the capacitor C7 and the collector of the transistor Q2, and the two ends of the resistor R16 are respectively connected to the source and drain of the switch tube Q1.

3. The energy-saving optical fiber interface circuit for an Ethernet managed switch according to claim 1, characterized in that: The model of the chip U1 is SPF_CAGE.

4. The energy-saving optical fiber interface circuit for an Ethernet managed switch according to claim 1, characterized in that: The module interface functional circuit also includes an inductor L1, a capacitor C1, a capacitor C2, a capacitor C3 and an anti-static TVS tube ESD1. The VCCR pin is connected to one end of the inductor L1, one end of the capacitor C2, one end of the capacitor C3, and one end of the anti-static TVS tube ESD1. The other end of the inductor L1 is connected to one end of the capacitor C1 and the source of the switch tube Q1. The other end of the capacitor C1, the other end of the capacitor C2, the other end of the capacitor C3 and the other end of the anti-static TVS tube ESD1 are grounded respectively.

5. The energy-saving optical fiber interface circuit for an Ethernet managed switch according to claim 1, characterized in that: The module interface functional circuit also includes an inductor L2, a capacitor C4, a capacitor C5, a capacitor C6 and an anti-static TVS tube ESD2. The VCCT pin is connected to one end of the inductor L2, one end of the capacitor C5, one end of the capacitor C6, and one end of the anti-static TVS tube ESD2. The other end of the inductor L2 is connected to one end of the capacitor C4 and the drain of the switch tube Q1. The other end of the capacitor C4, the other end of the capacitor C5, the other end of the capacitor C6, and the other end of the anti-static TVS tube ESD2 are grounded respectively.

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