Network transmitting apparatus and power saving method thereof

The present invention relates to a network transmission device in general, and more particularly to a network transmission device and a power saving method applied to the network transmission device.

With the rapid development of electronic technology, computers and various information digitization facilities are becoming more and more dominant. To share resources, networks play an essential role in exchanging information. Among various network arrangements, Ethernet (Ethernet registered trademark) has advantages such as easy access, convenient startup, and high transmission speed, and Ethernet-related equipment is rapidly developing and its transmission speed is high. It is increasing from 10Mbps to 100Mbps or 1000Mbps.

In Ethernet network transmission equipment, the current network transmission speed can be divided into 10M, 100M and 1000M. During the transmission of network signals, the transmission voltage of the network transmission device differs depending on the network transmission. For example, when the network transmission speed is 10 Mbps, the transmission voltage of the network transmission device is, for example, about ± 2.5 volts (V). When the network transmission speed is 100 Mbps, the transmission voltage of the network transmission device is, for example, about ± 1 V. When the network transmission speed is 1000 Mbps, the transmission voltage of the network transmission device is, for example, about ± 1 V, and its reception voltage is about ± 1 V with a shorter cable length, and its maximum. The voltage can reach about ± 2V.

<p> However, network transmission devices do not always maintain the same network transmission rate during data transmission. Maximum of three levels (network transmission speeds of 10Mbps, 100Mbps and 1000Mbps) to maintain normal operation of network transmission equipment, that is, to allow network transmission equipment to transmit data at different network transmission speeds. A voltage value, or ± 2.5 V, must be provided, which results in excessive power consumption of the network transmission device.</p><p> Therefore, an object of the present invention is to provide a network transmission device and a power saving method thereof that achieve the object of power saving.</p>

<p> As described specifically and broadly herein, the present invention provides a network transmission device, including a chip, a transformer, and a power regulating unit. The chip includes a detection and control unit, analog and digital circuits. The detection and control unit receives the received signal, detects the received signal and the state of the chip, and generates the first control signal. The transformer has a primary side and a secondary side, and the primary side is connected to the chip. The power adjustment unit is connected to the detection and control unit, and the center tap on the primary side of the transformer to receive the voltage, generate the first adjustment voltage according to the first control signal, and set the first adjustment voltage to the transformer. It is used for transmission to the center tap on the primary side, analog circuit and digital circuit.</p><p> In one embodiment of the invention, the detection and control unit detects that the received signal is carrying information about network transmission speed, direct current-wander, transmission amplitude and cable length. 1 When generating a control signal, the first adjustment voltage generated by the power adjustment unit is transmitted to the center tap on the primary side of the transformer.</p><p> In one embodiment of the invention, when the detection and control unit detects a received signal processed by a signal-to-noise rate (SNR) and generates a first control signal, the power adjustment unit The generated first adjustment voltage is transmitted to the analog circuit.</p><p> In one embodiment of the present invention, when the detection and control unit detects the magnitude of the internal delay of the chip and generates a first control signal, the first adjustment voltage generated by the power adjustment unit is transmitted to the digital circuit. Be transmitted.</p><p> In one embodiment of the present invention, the detection and control unit further detects the received signal to generate a second control signal, and the power adjustment unit further generates a second adjustment voltage according to the second control signal, and the first The regulated voltage and the second regulated voltage are transmitted to two units selected from the center tap, analog circuit and digital circuit on the primary side of the transformer, respectively.</p><p> In one embodiment of the invention, when the detection and control unit detects a received signal carrying information on network transmission speed, DC-voltage, transmission amplitude, cable length and generates a first control signal, the power adjustment unit. When the first adjustment voltage generated by is transmitted to the center tap on the primary side of the transformer and the detection and control unit detects the received signal processed by the SNR and generates the second control signal, the power adjustment unit The second adjustment voltage generated by is transmitted to the analog circuit.</p><p> In one embodiment of the invention, when the detection and control unit detects the magnitude of the internal delay of the chip and generates a first control signal, the first adjustment voltage generated by the power adjustment unit is transmitted to the digital circuit. At the same time, when the detection and control unit detects the received signal carrying information on the network transmission speed, DC-voltage, transmission amplitude, and cable length and generates the second control signal, the power adjustment unit generates the second control signal. 2 The regulated voltage is transmitted to the center tap on the primary side of the transformer.</p><p> In one embodiment of the invention, when the detection and control unit detects the magnitude of the internal delay of the chip and generates a first control signal, the first adjustment voltage generated by the power adjustment unit is transmitted to the digital circuit. At the same time, when the detection and control unit detects the received signal processed by the SNR and generates the second control signal, the second adjustment voltage generated by the power adjustment unit is transmitted to the analog circuit.</p><p> In one embodiment of the present invention, when the detection and control unit detects the received signal and generates the first control signal, the detection and control unit further detects the state of the chip and generates the third control signal. The power adjustment unit further generates a third adjustment voltage according to the third control signal, and the first adjustment voltage, the second adjustment voltage, and the third adjustment voltage are applied to the center tap on the primary side of the transformer, the analog circuit, and the third adjustment voltage, respectively. Transmit to a digital circuit.</p><p> In one embodiment of the present invention, when the detection and control unit detects a received signal carrying information on network transmission speed, DC-voltage, transmission amplitude, and cable length to generate a first control signal, the power adjustment unit. When the first adjustment voltage generated by is transmitted to the center tap on the primary side of the transformer and the detection and control unit detects the received signal processed by SNR and generates the second control signal, the power adjustment unit When the generated second adjustment voltage is transmitted to the analog circuit and the detection and control unit detects the magnitude of the internal delay of the chip and generates the third control signal, the third generated by the power adjustment unit. The adjustment voltage is transmitted to the digital circuit.</p><p> In one embodiment of the invention, the network transmission device further includes a first resistor and a second resistor. The first end of the first resistor is connected to the first end on the primary side of the transformer. The first end of the second resistor is connected to the second end of the first resistor, and the second end of the second resistor is connected to the second end on the primary side of the transformer.</p><p> In one embodiment of the invention, the voltage is the operating voltage.</p><p> The present invention further provides a power saving method for a network transmission device. The network transmission device includes a chip and a transformer, and the chip includes an analog circuit and a digital circuit. The power saving method includes the following steps. First, the received signal is received. Next, the received signal or the state of the chip is detected to generate the first control signal. Then, the first adjustment voltage is generated so as to correspond according to the first control signal. Next, the first adjustment voltage is transmitted to the center tap on the primary side of the transformer, the analog circuit, and the digital circuit.</p><p> In one embodiment of the invention, the first regulated voltage is the transformer when it detects that the received signal is carrying information about network transmission speed, direct current wander, transmission amplitude, and cable length. It is transmitted to the center tap on the primary side.</p><p> In one embodiment of the present invention, when it is detected that the received signal is signal-noise rate (SNR) processed, the first adjustment voltage is transmitted to the analog circuit.</p><p> In one embodiment of the present invention, when the magnitude of the internal delay of the chip is detected, the first adjustment voltage is transmitted to the digital circuit.</p><p> In one embodiment of the present invention, the power saving method of the network transmission device further includes the following steps. First, the received signal is detected and a second control signal is generated. Then, the second adjustment voltage is generated so as to correspond according to the second control signal. Next, the first adjustment voltage and the second adjustment voltage are transmitted to two units selected from the center tap on the primary side of the transformer, the analog circuit, and the digital circuit, respectively.</p><p> In one embodiment of the present invention, when it is detected that the received signal is carrying information on the network transmission speed, DC-voltage, transmission amplitude, and cable length, the first control signal is generated and the first control signal is generated. When the adjustment voltage is transmitted to the center tap on the primary side of the transformer and it is detected that the received signal is SNR processed, the second control signal is generated and the second adjustment voltage is transmitted to the analog circuit. ..</p><p> In one embodiment of the present invention, when the magnitude of the internal delay of the chip is detected, the first control signal is generated, the first adjustment voltage is transmitted to the digital circuit, and the received signal is the network transmission speed, DC-Wonder. When it is detected that information on the transmission amplitude and cable length is being carried, a second control signal is generated and the second adjustment voltage is transmitted to the center tap on the primary side of the transformer.</p><p> In one embodiment of the present invention, when the magnitude of the internal delay of the chip is detected, the first control signal is generated, the first adjustment voltage is transmitted to the digital circuit, and the received signal is SNR processed. Is detected, a second control signal is generated and the second adjustment voltage is transmitted to the analog circuit.</p><p> In one embodiment of the present invention, when the received signal is detected and the first control signal is generated, the power saving method further includes the following steps. First, the state of the chip is detected and a third control signal is generated. Then, a third adjustment voltage is generated so as to correspond according to the third control signal. Next, the first adjustment voltage, the second adjustment voltage, and the third adjustment voltage are transmitted to the center tap on the primary side of the transformer, the analog circuit, and the digital circuit, respectively.</p><p> In one embodiment of the present invention, when it is detected that the received signal is carrying information on the network transmission speed, DC-wander, transmission amplitude, and cable length, the first control signal is generated and the first control signal is generated. When the adjustment voltage is transmitted to the center tap on the primary side of the transformer and it is detected that the received signal is SNR processed, the second control signal is generated and the second adjustment voltage is transmitted to the analog circuit, and the chip. When the magnitude of the internal delay is detected, the third control signal is generated and the third adjustment voltage is transmitted to the digital circuit.</p><p> In the present invention, the detection and control unit detects and responds to the information carried by the received signal (that is, the network transmission speed, the SNR of the DC-wander and the received signal) and the state of the chip (the magnitude of the internal delay of the chip). As described above, the first control signal, the second control signal, and the third control signal are generated. Then, the power adjustment unit generates the first adjustment voltage, the second adjustment voltage, and the third adjustment voltage according to the first control signal, the second control signal, and the third control signal, and the first adjustment voltage, the second adjustment voltage, and the third adjustment voltage. The third adjustment voltage is transmitted to the center tap on the primary side of the transformer, the analog circuit, and the digital circuit, respectively. Thus, the present invention can save power consumption of network transmission equipment by dynamically adjusting the voltage of the center tap, analog circuit and digital circuit on the primary side of the transformer. Although three regulated voltages are described in the present invention, they are independent of each other and can exist independently.</p>

<p> That is, the present invention allows the detection and control unit to detect the information carried by the received signal (ie, network transmission speed, DC-Wander and SNR of the received signal) and the state of the chip (the magnitude of the internal delay of the chip). The first control signal, the second control signal, and the third control signal are generated so as to correspond to each other. Then, the power adjustment unit generates the first adjustment voltage, the second adjustment voltage, and the third adjustment voltage based on the first control signal, the second control signal, and the third control signal, and the first adjustment voltage and the second adjustment voltage. The voltage and the third adjustment voltage are transmitted to the center tap on the primary side of the transformer, the analog circuit, and the digital circuit, respectively. In this way, the present invention can save the power consumption of the network transmission device by dynamically adjusting the voltage of the center tap, the analog circuit and the digital circuit on the primary side of the transformer. In the present invention, three regulated voltages are described, but they are independent of each other and can exist independently.</p>

<figref num="1">It is a circuit block diagram which shows the network transmission apparatus which concerns on embodiment of this invention.</figref><figref num="2">It is a flow chart which shows the power saving method of the network transmission apparatus which concerns on embodiment of this invention.</figref><figref num="3">It is a flow chart which shows the power saving method of the network transmission apparatus which concerns on another Embodiment of this invention.</figref><figref num="4">It is a flow chart which shows the power saving method of the network transmission apparatus which concerns on still another Embodiment of this invention.</figref>

Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.

FIG. 1 is a circuit block diagram showing a network transmission device according to an embodiment of the present invention. The network transmission device 100 provided in the present invention can be applied to, but is not limited to, Gigabit Ethernet. In FIG. 1, the network transmission device 100 includes a chip 110, a transformer 120, and a power adjustment unit 130.

The chip 110 includes a detection and control unit 111, an analog circuit 112, and a digital circuit 113. The detection and control unit 111 receives the received signal RS, detects the state of the received signal RS and the chip 110, and generates the first control signal CS1, the second control signal CS2, and the third control signal CS3 accordingly. Let me. In this embodiment, the detection and control unit 111 indicates that the received signal RS carries the network transmission rate, direct current wander, Transmit Amplitude and Cable Length. When it is detected, the first control signal CS1 is generated.

Generally speaking, the network transmission speed of the network transmission device 100 is classified into 10 Mbps, 100 Mbps and 1000 Mbps. The operating voltage of the network transmission device 100 changes depending on the network transmission speed. For example, when the network transmission speed is 10 Mbps, the transmission voltage of the network transmission device 100 is, for example, about ± 2.5 V. When the network transmission speed is 100 Mbps, the transmission voltage of the network transmission device 100 is, for example, about ± 1 V. When the network transmission speed is 1000 Mbps, the transmission voltage of the network transmission device 100 is, for example, about ± 1 V, its reception voltage is, for example, about ± 1 V, and its maximum voltage reaches about ± 2 V. To do.

Also, after the network transmission device receives the received signal RS, a DC-wander phenomenon may occur in the received signal RS due to the DC loss of the transformer 120, resulting in the received signal. The DC voltage of RS is attenuated. In the network transmission device 100, the transmission amplitude performance (Performance) of the received signal RS can also be used as a basis for adjusting the first adjustment voltage RV1. The cable length is determined based on the amplitude of the received signal RS, i.e., at shorter cable lengths, the amplitude of the transmitted signal can be reduced without sacrificing performance.

Therefore, when receiving the received signal RS, the detection and control unit 111 detects that the received signal RS is carrying the network transmission speed, DC-voltage, transmission amplitude and cable length, and the first control signal. It is used as the basis for generating CS1 and adjusting the reception voltage V1 of the power adjustment unit 130 to generate the first adjustment voltage RV1.

For example, when it detects that the network transmission speed is 10 Mbps, the detection and control unit 111 further calculates the DC-wander value in this state, detects the transmission amplitude and the cable length, and outputs the first control signal CS1_1. generate. When it detects that the network transmission speed is 100 Mbps, the detection and control unit 111 calculates the DC-wander value in this state, detects the transmission amplitude and the cable length, and generates the second control signal CS1_2. When it detects that the network transmission speed is 1000 Mbps, the detection and control unit 111 calculates the DC-wander value in this state, detects the transmission amplitude and the cable length, and generates the third control signal CS1_3. In this embodiment, when the network transmission speed is 10 Mbps, the received signal RS has no DC-Wonder phenomenon and the DC-Wonder value becomes zero.

Further, the detection and control unit 111 detects the received signal RS processed by the signal-to-noise rate (SNR) and generates the second control signal CS2. For example, when detecting that the SNR of the received signal RS is high, the detection and control unit 111 generates the second control signal CS2_1, which reduces the received voltage V1 of the voltage adjusting unit 130 to obtain the second adjusted voltage RV2_1. It is the basis for generating it. When it detects that the SNR of the received signal RS is low, the detection and control unit 111 generates the second control signal CS2_2, which increases the received voltage V1 of the voltage regulating unit 130 to generate the second regulated voltage RV2_2. It becomes the basis. In this embodiment, the second regulated voltages RV2_1 and RV2_2 can be analog voltages.

Further, the detection and control unit 111 generates the third control signal CS3 based on the state of the chip 110, that is, the magnitude of the internal delay of the chip 110. For example, when detecting that the internal delay of the chip 110 is large, the detection and control unit 111 generates the third control signal CS3_1, which increases the received voltage V1 of the voltage adjusting unit 130 to generate the third adjusting voltage RV3_1. It is the basis for generating it. When detecting that the internal delay of the chip 110 is small, the detection and control unit 111 generates the third control signal CS3_2, which reduces the received voltage V1 of the voltage regulating unit 130 to generate the third regulated voltage RV3_2. It becomes the basis. In this embodiment, the third regulated voltages RV3_1 and RV3_2 can be digital voltages.

In this embodiment, the internal delay of the chip 110 is detected by the Configuring Counters A and B in the detection and control unit 11. Counter A is, for example, a counter having a fixed clock (Fixed Clock), and the clock of counter B is provided by, for example, a Ring Oscillator and can be changed in size. Therefore, once chip 110 begins to be manipulated, both counter A and counter B start counting, and counter A and counter B are calculated once per cycle by statistical values. If the value of counter A is larger than that of counter B, it indicates that the internal delay of chip 110 is large. If the value of counter A is smaller than that of counter B, it indicates that the internal delay of chip 110 is small.

In FIG. 1, the transformer 120 has a primary side and a secondary side, and the primary side of the transformer 120 is connected to the detection and control unit 111. The power regulation unit 130 and the transformer 120 connected to the detection and control unit 111 receive a voltage (for example, an operating voltage of 3.3 V) V1 and receive a first control signal CS1, a second control signal CS2 and a third control signal CS3. According to, the first adjustment voltage RV1, the second adjustment voltage RV2 and the third adjustment voltage RV3 are used to generate the first adjustment voltage RV1, the second adjustment voltage RV2 and the third adjustment voltage RV3, respectively. It transmits to the center tap (Center Tap) on the primary side of 120, the analog circuit 112, and the digital circuit 113.

For example, according to the first control signal CS1 generated at the transmission speed of 10 Mbps, 100 Mbps or 1000 Mbps at that time, the power adjustment unit 130 generates the first adjustment voltage RV1 to connect to the center tap on the primary side of the transformer 120. .. In this way, the voltage of the center tap on the primary side of the transformer 120 is maintained at the minimum level, and at the same time, the normal operation of the network transmission device is maintained, so that the power consumption of the network transmission device is effectively reduced.

In the following, for example, which is the minimum voltage Vct of the center tap on the primary side of the transformer 120 according to the network transmission speed, transmission voltage, cable length and DC-wonder at different network transmission speeds (10 Mbps, 100 Mbps and 1000 Mbps)? Explain how to select.

When the network transmission speed is 10 Mbps, the minimum voltage Vct is calculated as "Vct-transmission voltage / 2 chip internal minimum operating voltage". If the transmission voltage is 2.5V and the internal minimum operating voltage of the transformer 120 is 0.6V, then "Vct-2.5 / 2 0.6", that is, "Vct 1.85V".

When the network transmission speed is 100 Mbps, the minimum voltage Vct is calculated as "Vct-transmission voltage / 2-DC-wonda / 2 chip internal minimum operating voltage". If the transmission voltage is 1V and the internal minimum operating voltage of the transformer 120 is 0.6V, then "Vct-1 / 2-DC-Wonder / 2 0.6", that is, "Vct 1.1 + DC-Wonder / 2" ". Here, assuming DC-wonda &lt;0.8, Vct = 1.1 to 1.5V.

When the network transmission speed is 1000 Mbps, the minimum voltage Vct is calculated as "Vct-transmission voltage / 2-received voltage / 2-DC-wonder / 2 chip internal minimum operating voltage". Suppose that the internal minimum operating voltage of the transformer 120 is 0.6V, the transmission voltage can be reduced to 0.8V with a shorter cable length, and the reception voltage is 1V. At longer cable lengths, the transmission voltage is 1V and the reception voltage is 0.8V. Here, assuming a DC-wonda value &lt;0.6 and applying the above equation, Vct = 1.5 to 1.8V is obtained.

Further, after receiving the second control signal CS2_1 (the SNR of the received signal RS is high), the power adjustment unit 130 generates the second adjustment voltage RV2_1 (that is, reduces the voltage of the analog circuit 112) and the second. The adjustment voltage RV2_1 is transmitted to the analog circuit 112 of the chip 110. After receiving the second control signal CS2_2 (the SNR of the received signal RS is low), the power adjustment unit 130 generates the second adjustment voltage RV2_2 (that is, increases the voltage of the analog circuit 112) and the second adjustment voltage. RV2_2 is transmitted to the analog circuit 112 of the chip 110. With this method, the power consumption of the network transmission device can be effectively reduced.

Further, after receiving the third control signal CS3_1 (the internal delay of the chip 110 is small), the power adjustment unit 130 generates the third adjustment voltage RV3_1 (that is, reduces the voltage of the digital circuit 113) and the third. The adjustment voltage RV3_1 is transmitted to the digital circuit 113 in the chip 110. After receiving the third control signal CS3_2 (the internal delay of the chip 110 is large), the power adjustment unit 130 generates the third adjustment voltage RV3_2 (that is, increases the voltage of the digital circuit 113) and the third adjustment voltage. RV3_2 is transmitted to the digital circuit 113 in the chip 110.

In FIG. 1, the network transmission device 100 further includes a resistor R1 and a resistor R2. The first end of the resistor R1 is connected to the first end on the primary side of the transformer 120. The first end of the resistor R2 is connected to the second end of the resistor R1 and the second end of the resistor R2 is connected to the second end on the primary side of the transformer 120. In this embodiment, the resistance values of resistors R1 and R2 are, for example, 50 ohms (Ω), without limitation.

It should be noted that in the above embodiment, the detection and control unit 111 simultaneously generates the first control signal CS1, the second control signal CS2, and the third control signal CS3, and the first adjustment voltage RV1 and the second adjustment. Since the voltage RV2 or the third adjustment voltage RV3 is generated respectively, the network transmission device 100 is powered saving. efficacy) can be achieved. However, the present invention is not limited to simultaneously generating the first control signal CS1, the second control signal CS2, and the third control signal CS3. Instead, the detection and control unit 111 further generates one control signal according to the network transmission speed, DC-wander, transmission amplitude and cable length in the received signal RS to generate the regulated voltage, the transformer 120. It can be transmitted to the center tap on the primary side to save the power consumption of the network transmission device. Alternatively, the detection and control unit 111 further generates one control signal according to the SNR of the received signal RS, generates an adjustment voltage, and transmits it to the analog circuit 112 of the chip 110 to reduce the power consumption of the network transmission device. You can save. Alternatively, one control signal can be generated according to the internal delay of the chip 110 to generate an adjustment voltage and transmitted to the digital circuit 113 in the chip 110 to save the power consumption of the network transmission device.

The power saving method of the network transmission device is determined by the above description of the embodiment. FIG. 2 is a flow chart showing a power saving method of the network transmission device according to the embodiment of the present invention. In this embodiment, the network transmission device includes a detection and control unit, a chip, and a transformer, of which the chip has an analog circuit and a digital circuit. In FIG. 2, the received signal is received during step S201. For example, the received signal is received by the detection and control unit. During step S202, the first control signal is generated by detecting the received signal or the state of the chip. In this embodiment, the detection and control unit detects a received signal carrying information on network transmission speed, DC-wander, transmission amplitude and cable length, thereby generating a first control signal. Alternatively, in this embodiment, the detection and control unit detects the SNR-processed received signal, thereby generating the first control signal. Alternatively, the detection and control unit detects the magnitude of the internal delay of the chip, thereby generating the first control signal.

During step S203, the first adjustment voltage is generated correspondingly according to the first control signal. During step S204, the first regulated voltage is transmitted to the center tap, analog and digital circuits on the primary side of the transformer. In this embodiment, if the first regulated voltage is generated according to the information of network transmission rate, DC-wonder, transmission amplitude and cable length carried by the received signal, the first regulated voltage is on the primary side of the transformer. It is transmitted to the center tap of. If the first adjustment voltage is generated according to the SNR carried by the received signal, the first adjustment voltage is transmitted to the analog circuit. Alternatively, if the first adjustment voltage is generated according to the magnitude of the internal delay of the chip, the first adjustment voltage is transmitted to the digital circuit. Thus, the power consumption of the network transmission device can be reduced by dynamically adjusting the voltage transmitted to the center tap on the primary side of the transformer, the analog circuit or the digital circuit.

FIG. 3 is a flow chart showing a power saving method of the network transmission device according to another embodiment of the present invention. In FIG. 3, first, the received signal is received during step S301. For example, the received signal is received by the detection and control unit. During step S302, the received signal or the state of the chip is detected, and the first control signal and the second control signal are generated. In this embodiment, the first control signal is generated when the detection and control unit detects information on the network transmission speed, DC-wander, transmission amplitude and cable length carried by the received signal, and the second control. The signal is generated when the detection and control unit detects the SNR processed received signal. Alternatively, the first control signal is generated when the detection and control unit detects the magnitude of the internal delay of the chip, and the second control signal is the network transmission speed, DC, that the detection and control unit carries the received signal. -Occurs when detecting information on wand, transmission amplitude and cable length. Alternatively, the first control signal is generated when the detection and control unit detects the magnitude of the internal delay of the chip, and the second control signal is generated when the detection and control unit detects the received signal processed by SNR. , Occurs.

During step S303, the first adjustment voltage and the second adjustment voltage are generated so as to correspond according to the first control signal and the second control signal. During step S304, the first and second regulated voltages are transmitted to two units selected from the transformer's primary center tap, analog and digital circuits, respectively. Therefore, the power consumption of the network transmission device is effectively reduced by simultaneously adjusting the voltage transmitted to the two units selected from the center tap on the primary side of the transformer, the analog circuit and the digital circuit.

FIG. 4 is a flow chart showing a power saving method of the network transmission device according to still another embodiment of the present invention. In FIG. 4, first, the received signal is received during step 401. For example, the received signal is received by the detection and control unit. During step S402, the received signal or the state of the chip is detected, and the first control signal, the second control signal, and the third control signal are generated. In this embodiment, the first control signal is generated when the detection and control unit detects information on the network transmission speed, DC-wander, transmission amplitude and cable length carried by the received signal; the second control signal. Is generated when the detection and control unit detects the SNR processed received signal; and the third control signal is generated when the detection and control unit detects the magnitude of the internal delay of the chip.

During step S403, the first adjustment voltage, the second adjustment voltage, and the third adjustment voltage are generated so as to correspond according to the first control signal, the second control signal, and the third control signal. During step S404, the first adjustment voltage, the second adjustment voltage, and the third adjustment voltage are transmitted to the center tap, the analog circuit, and the digital circuit on the primary side of the transformer, respectively. Therefore, the power consumption of the network transmission device is effectively reduced by simultaneously adjusting the voltage transmitted to the center tap on the primary side of the transformer, the analog circuit, and the digital circuit.

As described above, the present invention has been disclosed by an embodiment, but of course, it is not intended to limit the present invention, and is suitable within the scope of the technical idea of the present invention so that those skilled in the art can easily understand it. Since various changes and amendments can be made as a matter of course, the scope of the patent protection must be determined based on the scope of claims and the area equivalent thereto.

100 network transmission equipment 110 chips 111 Detection and control unit 112 analog circuit 113 Digital circuit 120 transformer 130 power adjustment unit R1, R2 resistors RS received signal CS1 1st control signal CS2 2nd control signal CS3 3rd control signal RV1 1st adjustment voltage RV2 2nd adjustment voltage RV3 3rd adjustment voltage V1 voltage S201 to S204 Each step showing a power saving method of the network transmission device according to a certain embodiment. S301 to S304 Each step showing a power saving method of the network transmission device according to another embodiment. S401 to S404 Each step showing a power saving method of the network transmission device according to another embodiment.