JP5751622B2 - Network equipment - Google Patents

Description

  The present invention relates to a network device connected to a network, and more particularly to a power saving control method for reducing power consumption.

  At present, network devices connected to the network are becoming more and more important for the environment-friendly design of each company, and energy-saving design is a selling point even when selling products to users. Element. In addition, portable network devices have appeared on the market, and it is necessary to reduce the power consumption as much as possible considering the battery life of the product.

  Therefore, it is possible to control the lighting / extinguishing of the LED display unit for notifying the operation state and communication state of the network device provided in the network device, or to control the power saving of the LCD display. Has been done. For example, a technique for turning off an LED lamp of a LAN port of a network device by a user operating a switch has been considered (for example, see Patent Document 1). In addition, other techniques for realizing power saving by the user operating the switch in this way are also considered (see, for example, Patent Document 2).

  In addition to using the physical switch provided in the network device as described above, the setting using the software pre-installed in the network device (setting the function on / off on the software screen) is performed. Thus, it is also considered to reduce the power consumption by turning off the power of the LED display unit and the LCD display unit.

JP 2010-28448 A JP 2004-274102 A

  However, as described above, when power saving is realized by setting using a switch or software, if the LED display unit or LCD display unit is turned OFF by the user's operation, the network device becomes abnormal and does not operate normally. If it does not start normally, the communication status will be disabled, and it will be in the state of being turned off despite the abnormal communication status, and the user will not know what the abnormal status is just by looking at the network device It will be. When the network device is turned on, or when the client device such as a personal computer is turned on and connected to the network device from now on, all the LED indications on the network device side are turned off, so it is possible to determine the operating state. However, there is a problem that the user operability is very bad.

  Here, the network device is connected to a device such as a personal computer in a state where LED display is possible, and after the personal computer is normally connected to the network device and enters a normal operating state, the LED display is turned off. There is also a means. However, it is very troublesome to operate a switch or button mounted on a network device for power saving control. Since the use of wireless LAN is increasing at home, it is only necessary to have an environment where a network device is installed next to a device such as a personal computer. For example, a network device is installed on the first floor and a personal computer is installed on the third floor. When using devices such as network devices and personal computers in different rooms in the home, such as using them, it is very inconvenient to perform a shift operation to power saving by a user operation.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a network device that can efficiently save power without requiring user operability.

In order to achieve the above object, the present invention provides:
In a network device that has a display interface to the user and is connected to the network,
Display control means for monitoring a communication state on the network and setting a display on the display interface in a power saving mode with less power consumption than in a normal operation according to the communication state.

In addition, a power saving control method in a network device having a display interface to a user and connected to a network,
The communication state on the network is monitored, and the display on the display interface is set to a power saving mode in which the power consumption is lower than that during normal operation according to the communication state.

In addition, the program has a display interface to the user and is executed by a network device connected to the network,
A communication state on the network is monitored, and a procedure for setting a display on the display interface to a power saving mode in which the power consumption is lower than that in a normal operation is executed according to the communication state.

  As described above, in the present invention, the display on the display interface is set in the power saving mode in which the power consumption is lower than that in the normal operation according to the communication state on the network, so that the operability by the user is unnecessary. Power saving can be achieved efficiently.

It is a figure which shows an example of the environment where the network apparatus of this invention was connected. It is a block diagram which shows one Embodiment of the network device shown in FIG. 3 is a flowchart for explaining the operation of the network device shown in FIGS. 1 and 2. 3 is a flowchart for explaining an operation of shifting to power saving when the CPU is re-linked up in the network device shown in FIGS. 1 and 2. 3 is a flowchart for explaining an operation of returning from a power saving mode to a normal state due to a communication state abnormality in the network device shown in FIGS. 1 and 2. 3 is a flowchart for explaining a method for confirming the stability of a communication state in the network device shown in FIGS. 1 and 2. It is a figure which shows the structure of the network apparatus shown in FIG. 1, (a) is a figure which shows the structure which performs control of several LAN ports and LED display collectively, (b) is control of several LAN ports and LED display. It is a figure which shows the structure which performs individually. FIG. 3 is a diagram illustrating a circuit configuration for realizing power saving by lowering the luminance of an LED display unit in the network device illustrated in FIGS. 1 and 2.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is a diagram showing an example of an environment in which network devices of the present invention are connected.

  As shown in FIG. 1, in this embodiment, a network device 1 such as a wireless LAN router or a hub used in a general home, and personal computers 2 and 3 are connected via a network. The network device 1 and the personal computer 2 are connected via a wireless LAN, and the network device 1 and the personal computer 3 are connected via a LAN cable 4 via a wired LAN. The network device 1 is connected to a higher-level network device (not shown) via a cable 5. The network device 1 is provided with LED units 6 and 7 serving as a display interface of the present invention. The LED unit 6 displays various states unique to the device, such as a POWER LED lamp indicating the power ON state, an LED lamp indicating the communication state with the host network device, and an LED lamp indicating the wireless communication state of the wireless LAN. The LED lamp notifies the user of the operating state, and the LED display can be arbitrarily designed according to the device specifications of the network device 1. The LED unit 7 is a link LED lamp that is generally arranged in a wired LAN port, and an LED that displays a communication state such as when the LAN port is linked up or data communication is arranged below the LED lamp. Become a lamp. Temporarily, the network device 1 has four LED lamps in the LED unit 6, and the LED unit 7 has five LAN LED lamps including a LAN port × 4 and a WAN port × 1. Similarly, the number of LED lamps and the like can be arbitrarily designed according to the device specifications of the network device 1. Although the LCD display unit is not described in the configuration of FIG. 1, it is possible to display the operation state using characters, icons, etc. on the LCD panel instead of the operation state display of the LEDs 6 and 7.

  FIG. 2 is a block diagram showing an embodiment of the network device 1 shown in FIG.

  As shown in FIG. 2, the network device 1 in this embodiment includes a CPU 10 serving as a display control unit of the present invention, an RF device 11, a MAC (Media Access Control) 12, a PHY 13, a LAN port 14, and a storage unit 15. The LCD control unit 16, the LCD display unit 17, the LED control unit 18, and the LED display unit 19 serving as the LED units 6 and 7 shown in FIG. The configurations of the CPU 10, the RF device 11, the MAC 12, the PHY 13, the LCD control unit 16, and the LED control unit 18 depend on the device (chip) specifications to be used, and thus are determined by the device such as a one-chip configuration or a two-chip configuration. Although the LAN port 14, the LCD display unit 17, and the LED display unit 19 are collectively described, any number can be provided depending on the specifications of the network device 1. The storage unit 15 can be used for storing image data to be displayed on the LCD display unit 17. Various programs including a startup program can be stored as necessary.

  In the network device 1 configured as described above, when power is turned on, power is supplied to each unit illustrated in FIG. Then, the CPU 10 is activated, and a necessary program is read from the storage unit 5 and executed. In addition, the CPU 10 controls the LED control unit 16 in order to reduce the current consumption of the network device 1, thereby performing ON / OFF control of the LED units 6 and 7 serving as the LED display unit 19 to realize power saving control. To do.

  Below, operation | movement of the network apparatus 1 mentioned above is demonstrated.

  FIG. 3 is a flowchart for explaining the operation of the network device 1 shown in FIGS. 1 and 2.

  First, when the network device 1 is powered on, the system is activated (step A1).

  Next, the CPU 10 turns on the LED display according to the operation state at that time according to the specification of the network device 1 via the LED control unit 16 according to the specification of the network device 1 (each LED according to the device specification). The lamp is turned on, blinked, and turned off) (step A2). For example, in the case of a POWER LED lamp, the LED lamp is turned on when the power is turned on. In addition, an LED lamp that displays a communication state with a higher-level network device, an LED lamp that displays a wireless LAN wireless communication state, and the like are lit or blinked depending on the device state. In addition, there is a case where the LED control unit 16 is not provided separately from the CPU 10 and is built in the CPU 10.

  Next, the CPU 10 starts a power saving function flow (step A3).

  The CPU 10 monitors the communication state of the network device 1 on the network, and first detects whether the network device 1 is connected to the personal computers 2 and 3 and is being linked up (step A4). If there is no link-up during an arbitrarily determined time, the CPU 10 shifts to a power saving mode in which the power consumption is lower than that during normal operation, and the LEDs of the LED units 6 and 7 are lit. If it is blinking, all the LED lamps are turned off via the LED control unit 18 (step A7).

  On the other hand, if the network device 1 is linked up, the CPU 10 does not immediately shift to the power saving setting, and then detects whether there is data transmission / reception on the linked LAN port (step A5). ). When there is data transmission / reception as well as link-up (the CPU 10 or the CPU 10 can count the number of data packets in communication by using the MAC 12 and PHY 13 blocks and determine whether data transmission / reception is in progress) Is using the network using the personal computer 2 or the personal computer 3. In that case, the user may see the LED units 6 and 7 in order to confirm the communication state of the network, and it is necessary to turn on the LED display unit 19 and the LCD display unit 17 so that the operation state can be confirmed. Specifically, when there is no data transmission / reception, the CPU 10 determines that the network device 1 and the personal computer 2 or the personal computer 3 are only linked up, and that the user is not performing data communication. If the mode is shifted to the power saving mode and the LEDs of the LED units 6 and 7 are lit and blinking, all the LED lamps are turned off. When determining that there is data transmission / reception, the CPU 10 confirms the data communication state (step A6).

  If the communication state is not stable and it is determined that the communication state is a predetermined abnormal state, the CPU 10 sets a waiting time for an arbitrary fixed period and performs the processing in step A6 until the communication state is stabilized. If it is determined that the communication state is stable and the communication state is not abnormal, the process proceeds to the power saving mode in step A7. A method for determining the stability of the communication state will be described later. Also, when determining the communication state in step A6, if the communication state is determined to be stable for an arbitrary fixed time or an arbitrary number of times and if the process proceeds to step A7, the stability tends to increase.

  In the power saving mode in step A7, the CPU 10 turns off all the LED lamps of the LED units 6 and 7 via the LED control unit 18 to reduce power consumption. When shifting to the power saving mode in step 7, the purpose is to turn off the LED display unit 19 and the LCD display unit 17 of the network device 1, and the user cannot easily check the state of the network device 1 in the turned off state. Therefore, it is necessary to make a determination in steps A4 to A6 with certainty and use a means capable of sufficient determination so that the flow proceeds to step A7.

  The processing from the power-on to the transition to the power saving setting has been described above. Next, the operation at the time of re-linking up from a state where all ports are linked down will be described. Specifically, the network device 1 is always on for 24 hours, and the description will be made when the user connects a device such as a personal computer to the network device 1. Since the user connects the personal computer to the network device 1, it can be assumed that the operation state of the network device 1 is confirmed by LED display. Therefore, the user does not shift to power saving until the data transmission / reception is stabilized. As described above, in the operation when the power is turned on, the power saving mode is entered under the following three conditions, and all the LED lamps are turned off.

(1) When link up is not established in step A4 (when there is no connection to the network device 1)
(2) When link-up is established at step A5 but no data transmission / reception is performed (3) When data transmission / reception is stable at step A6 FIG. 4 shows the network device 1 shown in FIG. 1 and FIG. It is a flowchart for demonstrating the transfer operation | movement to the power saving at the time of re-linking up of CPU10.

  When re-link up occurs in the network device 1 (step B1), the CPU 10 performs processing for returning from the power saving mode to the normal state (step B2).

  First, the CPU 10 turns on and blinks the LED lamps of the LED units 6 and 7 so as to display the current operation state of the network device 1, and the operation state of the network device 1 at the time of re-linking up to the user. (Step B3). As a result, the normal state before shifting to the power saving mode is restored.

  Next, the CPU 10 starts the power saving function flow again (step B4).

  The CPU 10 detects whether there is data transmission / reception at the LAN port that is linked up (step B5). When there is no data transmission / reception, the CPU 10 determines that the network device 1 and the personal computer 2 or the personal computer 3 are only linked up and the user is not performing data communication, and shifts to the power saving mode. If the LEDs of the units 6 and 7 are lit and blinking, all the LED lamps are turned off (step B7).

  On the other hand, if the CPU 10 determines that there is data transmission / reception, the CPU 10 checks the data communication state (step B6). If it is determined that the communication state is not stable, a waiting time of an arbitrary fixed period is provided, and the process in step B6 is repeated until the communication state is stable. If it is determined that the communication state is stable, step B7 The power saving mode is entered, and all LED lamps of the LED units 6 and 7 are turned off. After the shift to the power saving mode, the network device 1 used by the user operates with reduced power consumption.

  Next, when the user operation is finished and the link with the personal computers 2 and 3 is disconnected, or when there is no user operation but an abnormal situation occurs and the link is disconnected (step B8), the CPU 10 restarts. It is detected whether there is a link up (step B9).

  If link-up is not performed again, the CPU 10 maintains the power saving mode without changing anything after a waiting time of an arbitrary fixed time (step B10). On the other hand, when the link-up is performed again, the process proceeds to step B1, and the CPU 10 performs a series of processes from step B1 described above.

  As described above, it is assumed that after the user transmits and receives data stably for a while, the mode is changed to the power saving mode in the flowchart shown in FIG. 3 or 4 and all LED display and LCD display are turned off. In that case, the user can use the network apparatus 1 without having to worry about the state of the LED lamps while comfortably using the network. Therefore, even if all the LED lamps are turned off, the user's operability is not inconvenient, but if the communication operation becomes unstable due to some reason, the current operation status of the network device 1 is confirmed. Therefore, the user confirms the state of LED display and LCD display. For example, it is necessary to check the operation state of the network device 1 by checking the LED lamp, such as whether the power is turned on or the LAN port is linked. At that time, it is necessary to turn on the LED display and LCD display of the network device 1 in order not to inconvenience the user's operability. The process will be described below. When the communication state is stable, the following processing is not necessary.

  FIG. 5 is a flowchart for explaining an operation of returning from the power saving mode to the normal state due to a communication state abnormality in the network device 1 shown in FIGS. 1 and 2.

  When the CPU 10 detects an unstable operation of communication in the network device 1 (step C1), the CPU 10 returns from the power saving mode to the normal state, and the LED display and the LCD display are turned on and blinking according to the operation state of the network device 1 ( Step C2).

  Next, the CPU 10 confirms whether there is data transmission / reception (step C3). In this flow, since it operates by detecting that the data communication state is unstable, it may be considered that there is almost data transmission / reception. If data transmission / reception is lost, the CPU 10 shifts to the power saving mode again (step C5). On the other hand, if there is data transmission / reception, the CPU 10 checks whether the communication state is stable (step C4). If the CPU 10 determines that the communication state is not stable, the CPU 10 provides a waiting time for an arbitrary fixed period, repeats the processing in step C4 until the communication state is stable, and determines that the communication state is stable. The process shifts to the power saving mode in step C5. If the communication state is determined in step C4, a waiting time of an arbitrary fixed time is provided, and if the communication state is determined to be stable for an arbitrary number of times and the process proceeds to step C5, the stability increases. Become a trend. The return conditions from power saving are as follows.

(1) Re-link up (when disconnected once and linked up again)
(2) When the communication state becomes unstable A method for confirming the stability of the communication state will be described below. As described above, when link down, which is one of the symptoms of communication instability, automatically returns from the power saving mode to the normal state. The following describes how to determine when the link is up due to another symptom but the communication status is unstable.

  FIG. 6 is a flowchart for explaining a method for confirming the stability of the communication state in the network device 1 shown in FIGS. 1 and 2.

  When the CPU 10 starts to determine the communication stability (step D1). First, it is determined whether it is wired LAN communication or wireless LAN communication (step D2). In the case of wired LAN communication such as a wired LAN connection between the network device 1 and the personal computer 3 or between the network device 1 and a higher-level network device, the CPU 10 determines the link rate of the port to which the wired LAN is connected. Confirmation is made to determine the stability based on the magnitude of an arbitrary threshold of the link rate set in advance (step D3). If the link rate is greater than an arbitrary threshold value, the CPU 10 determines that the communication state is stable (step D5). On the other hand, when the link rate is smaller than the threshold, the CPU 10 determines that the communication state is unstable (step D6).

  Further, in the case of wireless LAN communication such as the state of wireless connection between the network device 1 and the personal computer 2, the CPU 10 sets a threshold for the received radio wave intensity (RSSI value) that is arbitrarily set in advance, and the magnitude of the threshold is small or large. Stability determination is performed (step D4). If the RSSI value of the wireless LAN communication is larger than the threshold value, the CPU 10 proceeds to step D5 and determines that the communication state is stable. On the other hand, when the RSSI value of the wireless LAN communication is smaller than the threshold value, the CPU 10 proceeds to step D6 and determines that the communication state is unstable.

  In this embodiment, the control of the LED display unit 19 by the CPU 10 via the LED control unit 18 has been described as an example. However, the LCD display unit (liquid crystal) 17 via the LCD control unit 16 may also be used. Similarly, the LCD can be controlled, and the LCD control will be briefly described.

  As shown in the block diagram of FIG. 2, the apparatus configuration is a part where the CPU 10, the LCD control unit 16, and the LCD display unit 17 replace the control of the LED lamp. A device configuration in which both the LED display unit 19 and the LCD display unit 17 are mounted can be designed, and the power saving control of each of the LED control unit 18 and the LCD control unit 16 can be performed independently.

  Regarding the power saving control of the LCD, a plurality of configurations can be considered unlike the control of the LED.

  First, when the mode is shifted to the power saving mode, the CPU 10 controls the LCD display unit 17 and the LCD control unit 16 to turn off the blocks related to the LCD control. In that case, since most of the power supply for the LCD control block is cut off, the power saving effect is great, but when returning from power saving and displaying on the LCD screen, it is necessary to initialize the LCD block again. There is a possibility that it takes time to display the LCD panel.

  Second, the LCD control unit 16 is a method for controlling the LCD display unit 17 with the power on. There is a method of realizing power saving by turning on / off the power of the LCD display unit 17 or turning on / off the backlight of the LCD display unit 17. The speed of re-display on the LCD, such as when switching to power saving mode by detecting the communication stability of the network device 1 and switching to power saving step by step by combining backlight control and power ON / OFF control Control that takes power saving into consideration becomes possible. Regarding backlight control, not only ON / OFF control but also brightness of the backlight can be controlled to save power. Similar to the above, a method of realizing power saving by adjusting the luminance of the LED can be considered, which will be described later.

(Other embodiment 1)
In this embodiment, a network device having many LAN ports such as a hub will be described instead of a network device such as an access point used in a general home.

  In general, the access point described in the above-described embodiment is provided with LED displays having a plurality of functions for displaying the power state, the wireless state, and the like as well as the LED for the LAN port. The hub described in this embodiment is an example of realizing power saving by efficiently controlling the hub, since a product having a plurality of LAN ports is generally not provided with a multifunctional LED display.

  7 is a diagram showing the configuration of the network device 1 shown in FIG. 1, in which (a) is a diagram showing a configuration for collectively controlling a plurality of LAN ports and LED displays, and (b) is a diagram showing a plurality of LAN ports. It is a figure which shows the structure which controls LED display separately.

  In the above-described embodiment, the communication state of the wired LAN or wireless LAN is confirmed, and the LED display or LCD display of the network device 1 is controlled to realize power saving. At this time, as shown in FIG. 7A, when there are a plurality of LAN ports 1 to n in the LAN port block 20 (imagine a hub), the CPU 10 checks the communication state of the LAN port block 20. The power saving control unit 21 collectively performs ON / OFF (lighting / extinguishing) control of all the LEDs 1 to LEDn of the LED block 22.

  On the other hand, in this embodiment, as shown in FIG. 7B, when there are a plurality of LAN ports 1 to n in the LAN port block 23, the CPU 10 changes the communication state of the LAN port block 23. Then, in the block 24 of the power saving control unit, ON / OFF control of all the LEDs 1 to LEDn of the LED block 25 is individually performed. Unlike the power saving block 21 shown in FIG. 7A, the power saving control block 24 is individually present in each LAN port, so that the power saving control of LED display can also be performed individually.

  In this embodiment, a large number of personal computers can be connected to the network device, and a personal computer or network device can be connected to each wired LAN port. In the configuration shown in FIG. 7A, in the connection of the wireless LAN or the wired LAN, the display unit of the LED or the LCD can display until the respective connection is stabilized, and after the stable communication state is established, Each display unit is turned off all at once and shifts to power saving. In contrast, the configuration shown in FIG. 7B assumes a network device such as a hub, and assumes that link-up / link-down to the wired LAN port frequently occurs. When link up / down occurs many times, the display state of the LED display or the LCD display increases, and the power saving effect may be reduced. Therefore, if the LED display of the wired LAN port is individually controlled, and link-up of a new port is detected in a state where link-up with a personal computer is established in multiple ports, only the LED of the linked-up LAN port is detected. It is possible to realize power saving by displaying blinking / lighting. This is realized by maintaining the display state of the LAN port without change in the connection state and the operation state, and performing power saving control only for the LAN port with the change.

(Other embodiment 2)
In the two embodiments described above, the means for performing power saving by controlling ON (lighting) and OFF (lighting off) of the LED display has been described. However, in this embodiment, power saving can be achieved by lowering the luminance of the LED. A configuration to be realized will be described. In the above description, the brightness adjustment of the LCD is mentioned, but the same effect as the brightness adjustment of the LED can be obtained.

  FIG. 8 is a diagram illustrating a circuit configuration for realizing power saving by reducing the luminance of the LED display unit 19 in the network device 1 illustrated in FIGS. 1 and 2.

  As shown in FIG. 8, the circuit configuration in this embodiment includes an LED control unit 30, three resistors 32 to 34 having different resistance values connected in parallel to each other, an LED 35 connected to the resistors 32 to 34, and a power source 36, and a switch 31 that switches connection between the resistors 32 to 34 and the LED control unit 30.

  In the network device having the circuit configuration as described above, when adjusting the brightness of the LED display unit 19, the current flowing through the LED 35 is controlled by selecting the resistor connected to the LED control unit 30, thereby The power consumption can be reduced by adjusting the brightness of the LED 35. For example, when the resistance value is resistance 32 <resistor 33 <resistor 34, the resistance value of the resistor 32 is the smallest, so that the most current can be passed through the LED 35 and the luminance is the brightest. And the reduction effect of power consumption is large in the reverse order of the resistance value (power consumption reduction effect: resistance R3> resistance R2> resistance R1). Here, three types of resistance values are described, but any design is possible. By adjusting the brightness of the LEDs in stages according to the operating state of the network device 1, it is possible to reduce the power consumption corresponding to the lowered brightness.

  Also in this embodiment, the CPU 10 monitors the communication state of the network device and performs power saving control as in the above-described embodiment, but is not the ON / OFF control of the LED display unit 19. The point which adjusts the brightness | luminance of LED differs from what was shown in embodiment mentioned above.

  Further, by combining the above-described three embodiments, it is possible to realize power saving by controlling the LED ON / OFF and stepwise adjustment of the LED brightness.

  As shown in the above-described embodiments, the present invention can reduce power consumption by performing power ON / OFF control of an LED display unit and an LCD display unit of a network device connected to a network. . By controlling while monitoring the communication state of the network, no user operation is required, and power can be saved efficiently.

  In addition, the communication state of the network can be monitored, and a transition to the power saving mode can be automatically made and a return from the power saving mode to the normal state can be performed. As a result, the user can easily reduce power consumption without intentionally turning off the operation of the LED display or the LCD display in consideration of power saving. It also monitors the operating status and communication status of network devices used by the user, automatically switches to the power saving mode, and returns to the normal status from the power saving mode in abnormal conditions that need to be notified to the user. The LED display unit and the LCD display unit can be returned to the display state.

  Recently, a plurality of personal computers, printers, and facsimiles are also connected to a home network via a wired LAN or a wireless LAN. For this reason, the network devices proposed in the present invention often operate for 24 hours without being turned off. Therefore, even when the network device is turned on, if it is not used for a while, it automatically shifts to the power saving mode. For example, the network device LED display and LCD display are intentionally turned off and darkened. When the user wants to work, all LED display and LCD display can be turned off in a state where data communication is not performed and a state where data communication is stable, so that it can be used in an intentionally dark state. At that time, there is no need to bother to turn off the power of the network device and to turn off the LED display and the LCD display.

  In the present invention, the processing in the network device 1 is recorded on a recording medium readable by the network device 1 in addition to the above-described dedicated hardware. The program recorded on the recording medium may be read by the network device 1 and executed. The recording medium readable by the network device 1 includes an IC card, a memory card, a floppy disk (registered trademark), a magneto-optical disk, a DVD, a CD, and the like, and a built-in network device 1. Refers to the HDD or the like. The program recorded on this recording medium is read by a control block, for example, and the same processing as described above is performed under the control of the control block.

1 Network device 2, 3 PC 4, 5 LAN cable 6, 7 LED unit 10 CPU
11 RF device 12 MAC
13 PHY
14 LAN port 15 Storage unit 16 LCD control unit 17 LCD display unit 18, 30 LED control unit 19 LED display unit 20, 23 LAN port block 21, 24 Power saving control unit 22, 25 LAN LED block 31 Switch 32-34 Resistance 35 LED element 36 Power supply

Claims (3)

In a network device that has a display interface to the user and is connected to the network,
Monitors the communication state on the network, the display on the display interface according to the communication state, have a display control means for setting the low power consumption saving mode than during normal operation,
If the communication state on the network is not a predetermined abnormal state, the display control means sets the display on the display interface to the power saving mode, and the communication state on the network is set in the power saving mode. A network device that returns to the normal state from the power saving mode when the device enters the abnormal state . A power saving control method in a network device having a display interface to a user and connected to a network,
When the communication state on the network is monitored, and the communication state is not a predetermined abnormal state, the display on the display interface is set to a power saving mode that consumes less power than during normal operation , and the power saving A power saving control method in a network device that returns from the power saving mode to a normal state when a communication state on the network becomes the abnormal state in the state set to the mode . Network devices that have a display interface for users and are connected to the network.
When the communication state on the network is monitored, and the communication state is not a predetermined abnormal state, the display on the display interface is set to a power saving mode that consumes less power than during normal operation , and the power saving A program for executing a procedure for returning from the power saving mode to the normal state when the communication state on the network becomes the abnormal state in the state set to the mode .

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