JP2001352333A - Network connection device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a network connection device which allows a user to easily and visually confirm operating state information and whose operation can be managed with a network terminal. SOLUTION: The network connection device is provided with: a 1st network interface section 104 consisting of at least a kind of physical layer connected to an external network such as the Internet; 2nd network interface sections 101-103 consisting of at least a kind of physical layer connected to an internal network such as a LAN; a communication control section 105 that controls input output communications of the 1st and 2nd network interface sections; a memory 106 that stores communication history information such as fault information and statistic information; a management section 107 that diagnoses a fault in the device itself and informs a user about the occurrence of a fault; a display section to which display devices are placed; and a display control section 108 that controls the indication of the display devices. The display control section 108 lights/blinks the display devices to inform the user about the operating state.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a network connection device for aggregating a plurality of network terminal devices existing in a home or a small office to connect to an external network such as the Internet.

[0002]

2. Description of the Related Art In recent years, with the explosive spread of the Internet, a plurality of personal computers (hereinafter, referred to as "PCs") in homes and small offices have been proposed.
There is a rapidly growing demand for consolidating and connecting to the Internet. Hereinafter, a conventional network connection device will be described.

FIG. 5 is a block diagram showing a network system having a conventional network connection device.

In FIG. 5, reference numeral 1 denotes a wide area network such as the Internet (hereinafter, referred to as “WAN”), and 2 denotes a W
A gateway device 3 serving as a network connection device used to connect to the AN 1; a local area network 3 (hereinafter referred to as “LAN”) such as Ethernet (registered trademark) constituting a closed network;
PCs 5 and 6 are network terminal devices connected by the LAN 3.

The operation of such a conventional network system will be described.

Network terminal devices 4 to 6 on LAN 3
Is connected to the WAN 1 such as the Internet, the communication is always performed via the network connection device 2. Therefore, when a failure occurs in the network connection device 2 itself, or when a failure occurs in the network to which the network connection device 2 connects (that is, WAN1 or LAN3), the network terminal devices 4 to 6 on the LAN3 connect to the WAN1. Can not do it. In the LAN 3 that is usually constructed, the network connection device 2 is installed in a place that is invisible to the user, and the network administrator often goes to the network connection device 2 and sets the device when necessary.

[0007]

However, in the above-described conventional network connection device, if a failure occurs in the network connection device 2 itself, the network terminal devices 4 to 6 on the LAN 3 cannot connect to the WAN 1.
There is a problem that it is not possible to visually confirm which part of the network connection device 2 has failed. Also, in order to identify and recover from the faulty part, the network administrator goes to the network connection device 2, connects the network terminal devices 4 to 6 to the network connection device 2, and browses a huge amount of communication history information. There has been a problem that a normal Internet user needs to perform a highly difficult operation, such as specifying a failure site and a cause of the failure.

In this network connection device, a plurality of LEDs and a plurality of buttons are attached to an LED display section and a button operation section, and operating status information such as a failure site and a degree of a failure is determined by turning on / off the LEDs. It is demanded that a user can easily confirm it visually and enable operation management from a PC (network terminal device) connected via a LAN.

The present invention satisfies such a demand,
It is an object of the present invention to provide a network connection device that can easily and visually confirm operation status information and that enables operation management from a network terminal device.

[0010]

In order to achieve this object, a network connection device of the present invention comprises a first network interface unit comprising at least one kind of physical layer connected to an external network such as the Internet;
A second network interface unit comprising at least one kind of physical layer connected to an internal network such as an AN, a communication control unit for controlling input / output communication in the first and second network interface units, failure information, and statistical information Memory for storing communication history information such as, a management unit for diagnosing faults in the equipment itself and notifying faults, a display unit with a plurality of displays, and a display for controlling the display of the displays The display control unit has a configuration in which a display unit is turned on and blinks to notify an operation status.

As a result, there can be obtained a network connection device capable of easily visually confirming the operation status information.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A network connection device according to a first aspect of the present invention comprises a first network interface unit comprising at least one kind of physical layer connected to an external network such as the Internet, and an internal network such as a LAN. A second network interface unit composed of at least one kind of physical layer connected to the communication network, a communication control unit for controlling input / output communication in the first and second network interface units, and communication history information such as fault information and statistical information A memory for storing information, a management unit for diagnosing a failure of the device itself and notifying the failure, a display unit provided with a plurality of displays, and a display control unit for controlling display of the displays. The display control unit turns on and blinks the display to notify the operation status.

With this configuration, the faulty part can be easily visually checked by selecting one of the plurality of displays to be turned on or blinking, and the number of times of the blinking can be controlled according to the degree of the trouble. This has the effect that the degree of the obstacle is easily confirmed visually.

According to a second aspect of the present invention, there is provided a network connection device according to the first aspect,
When a failure occurs in the device itself or in a network connected to the device, the display unit blinks the corresponding display among the plurality of displays by linking the degree of the failure and the blinking frequency. It was decided to let it.

[0015] With this configuration, the failure site can be easily visually confirmed by the corresponding display, and the degree of the failure can be easily visually confirmed by linking the blinking frequency to the failure level.

According to a third aspect of the present invention, there is provided a network connection device according to the first aspect,
The management unit displays the display unit on the screen of the network terminal device connected via the second network interface unit, including the lighting / flashing display of the display.

According to this configuration, the operation status is displayed on the network terminal device, and the operation status of the network connection device can be easily visually checked from a remote network terminal device without directly going to the installation location of the network connection device. Has an action.

According to a fourth aspect of the present invention, there is provided the network connection device according to the first aspect,
The management unit displays the display unit on the screen of the network terminal device connected via the second network interface unit, including the lighting / flashing display of the display unit, and displays a plurality of input devices such as a mouse of the network terminal device from an input device such as a mouse. By specifying any one of the display units, communication history information such as fault information and statistical information of the device itself and the network interface unit corresponding to the specified display unit among the first and second network interface units can be transmitted to the network. This is to be displayed on a display unit on the screen of the terminal device.

With this configuration, the communication history information is displayed on the network terminal device, and there is no need to directly check the communication history information of the network connection device on the network connection device. This has the effect that information can be easily visually confirmed.

According to a fifth aspect of the present invention, there is provided a network connection device comprising: a first network interface unit comprising at least one physical layer connected to an external network such as the Internet; and at least one type connected to an internal network such as a LAN. A second network interface unit comprising a physical layer, a communication control unit for controlling input / output communication in the first and second network interface units, and a memory for storing communication history information such as fault information and statistical information. Has a management unit for diagnosing a failure of the device itself and notifying the failure, and a button operation unit provided with a plurality of buttons, and the management unit is configured to press any one of the plurality of buttons. It is intended to restart the device and perform all initialization.

According to this configuration, the device can be easily restarted and all-initialized, and the operation of managing the device can be directly and explicitly performed without passing through the communication interface.

According to a sixth aspect of the present invention, there is provided a network connection device according to the fifth aspect, wherein
The management unit causes the button operation unit including the plurality of buttons to be displayed on the screen of the network terminal device connected via the second network interface unit, and displays the screen of the network terminal device from an input device such as a mouse of the network terminal device. By designating any one of the above buttons, the same restarting and initializing operations as when the designated button is pressed are performed.

According to this configuration, there is an effect that the restart of the network connection device and the entire initialization can be easily performed from the network terminal device located at a place remote from the network connection device.

Hereinafter, an embodiment of the present invention will be described with reference to FIG.
This will be described using FIGS.

(First Embodiment) FIG. 1 is a block diagram showing a network connection device according to a first embodiment of the present invention. The network system including the network connection devices according to the present embodiment has the same configuration as that of FIG. That is, the network system according to the present embodiment is obtained by replacing the gateway device 2 as the network connection device in FIG. 5 with the network connection device in FIG.

In FIG. 1, reference numeral 100 denotes a group of network terminals (PCs) 4 to 6 (see FIG. 5),
Network connection devices 101, 102, and 103 used to connect to AN1 are LAN interface units (second network interface units) for connecting to LAN3 (see FIG. 5) as an internal network;
104 is a WAN interface unit (first network interface unit) for connecting to an external network such as the Internet, 105 is a communication control unit having a routing function for networks 1 and 3 to which the network connection device 100 connects, and 106 is connection information , Memory for storing communication history information such as fault information, statistical information,
Reference numeral 107 denotes a management unit for diagnosing a failure of the apparatus and performing a failure notification or the like; 108, an LED display control unit for lighting / flashing an LED as a display installed on an LED display unit (described later) of the network connection device 100; An input processing unit 110 installed in a button operation unit (described later) that performs processing by pressing a button is a bus that connects the communication control unit 105, the memory 106, the management unit 107, the LED display unit 108, and the input processing unit 109. LAN interface units 101 to 10
The interface between the LAN interface 3 and the WAN interface unit 104 is selected as a physical layer from communication interfaces such as Ethernet, telephone line, optical fiber, coaxial cable, power line, and wireless.

FIG. 2 shows the LE of the network connection device of FIG.
It is a top view which shows D display part and a button operation part.

In FIG. 2, reference numerals 101 to 103 denote LAN interface units similar to those in FIG. 1, and 104 denotes a W interface similar to that in FIG.
AN interface units 111 to 113 are L as display devices corresponding to the LAN interface units 101 to 103.
ED, 114 is an LED corresponding to the WAN interface unit 104, 115 is a power switch of the network connection device 100, 116 is an LED as a display corresponding to the power switch 115, 117 is pressed to restart the network connection device 100 when pressed. Button 118 for forcibly resetting the information setting values of the network-connected devices to the factory setting values by pressing the button (hereinafter referred to as “all initialization”).
Button 119 for performing LED)
LED display unit consisting of 4, 116, 120 is button 11
This is a button operation unit composed of 7, 118.

The operation of the thus-configured network connection device 100 will be described.

First, the operation when the power switch 115 is pressed and the subsequent control operation of the network connection device 100 will be described.

When the power switch 115 of the network connection device 100 is turned on, the corresponding LED 116 is turned on, and the network connection device 100 starts operating.
After the network connection device 100 is started, the LED 116
Also plays the role of displaying the operation status of the network-connected device 100. When the management unit 107 detects an abnormality in the operation of the network-connected device 100, the failure information is transmitted through the bus 110 and stored in the memory 106,
In addition, the LED display control unit 108 changes the lighting color of the corresponding LED or blinks the LED to display an operation failure of the network connection device 100.

Next, the operation when the network interface is connected and the subsequent control operation of the first and second network interface units 101 to 104 will be described with reference to the drawings.

When a communication medium conforming to the interface is connected to the LAN interface unit 101 with the power switch 115 turned on, the corresponding LED 111 is turned on to indicate that the network connection device 100 has been connected to the network 3 through the LAN interface unit 101. Show. After the LED is turned on, the LED 111 also plays a role of visualizing the operation status of the LAN interface unit 101.
When the management unit 107 detects an abnormality in the operation of the LAN interface unit 101, the failure information is transmitted through the bus 110 and stored in the memory 106, and the LED display control unit 108 changes the lighting color of the corresponding LED 111 or the like. , The LED 111 is blinked, and the operation failure of the LAN interface unit 101 is displayed. Similarly, in FIG. 2, LEDs 112 and 103 are provided for the LAN interface units 102 and 103 and the WAN interface unit 104, respectively.
113 and 114 correspond to each other, and the LEDs 112 to 114 are turned on together with the connection of the network interface units 102 to 104, and thereafter, the color of the light is changed or blinking to visualize the operation status of the network interface units 102 to 104 (that is, LED). (Visualization by lighting and blinking).

Next, the control operation when the button is pressed will be described.

Button 1 with power switch 115 on
17 is pressed, the normal network connection device 10
0 Forcibly restart the device without going through the management operation of the main unit. Similarly, when the button 118 is pressed while the power switch 115 is turned on, all the setting information of the device is forcibly initialized and restarted without going through the normal management operation of the network-connected device 100.

As described above, according to the present embodiment, the first network interface unit 104 composed of at least one kind of physical layer connected to the external network 1 such as the Internet and the internal network 3 such as a LAN are connected. Second network interface units 101 to 103 including at least one kind of physical layer;
A communication control unit 105 for controlling input / output communication in the network interface units 101 to 104, a memory 106 for storing communication history information such as fault information and statistical information, and a fault notification for diagnosing faults of the equipment itself. Managing unit 107 and a plurality of LEDs 111 to 114, 116
Is provided, and an LED display control unit 108 for controlling the display of the LED is provided. The LED display control unit 108 turns on and blinks the LED to notify the operation status. By selecting an LED to be turned on or blinking from among a plurality of LEDs, the failure site can be easily visually checked, and if the number of blinks is controlled in accordance with the degree of the failure, the degree of the failure can be easily controlled. Can be confirmed visually. Also, multiple buttons 1
It has a button operation unit 120 provided with 17, 118,
The management unit 107 restarts the device or initializes all devices by pressing one of the plurality of buttons 117 and 118, so that the device can be easily restarted or initialized. Can be.

(Embodiment 2) The configuration of a network connection device according to Embodiment 2 of the present invention is the same as that of FIG.
The description is omitted. This embodiment is different from the first embodiment in the operation of the management unit 107.

In this embodiment, the degree of operation failure / communication failure and the operation corresponding thereto are registered in the management unit 107 in advance. A specific example will be described with reference to (Table 1).

[0039]

[Table 1]

As shown in (Table 1), the degree of the failure is divided into three levels: mild, moderate, and severe. Then, as shown in (Table 1), the LED blinks once every 5 seconds for a minor failure, and blinks twice every 5 seconds for a moderate failure, and for a severe failure. The blinking is assumed to be three blinks at 5-second intervals. Here, the minor failure is a problem that can be resolved over time without taking any action on the network connection device 100, and specifically includes a frame collision (collision) in Ethernet. The medium fault is a case where a fault has actually occurred and is caused by a user error such as an error in information setting of the network connection device 100, and the information setting needs to be performed again. The severe failure is a case in which forced control means such as a restart of the network connection device 100 is required due to a communication disabled state.

First, a case where a failure occurs in the main body of the network connection device 100 will be described. Management unit 107
Instructs the LED display control unit 108 to blink the LED according to the degree of the failure when the failure of the network-connected device 100 is detected. The LED display control unit 108
The LED 116 for displaying the operation status of the main body of the network connection device 100 blinks, and the network connection device 100
Visualize and notify the user how much trouble has occurred in the main unit.

Next, a case where a communication failure occurs will be described. LAN interface units 101, 102, 10
The communication control unit 105 detects a failure that has occurred in the WAN interface unit 3 or the WAN interface unit 104, and the communication control unit 105 notifies the management unit 107 of the communication interface in which the failure has occurred and its contents. The management unit 107 includes the LED display control unit 10
8 instructs the LED to blink according to the degree of the failure. L
The ED display control unit 108 blinks an LED (any one of the LEDs 111 to 114) corresponding to the communication interface in which the failure has occurred, and visualizes to the user how much failure has occurred in the communication interface. Notice.

By flashing the LED and visualizing and notifying the user of the specific fault location and the degree of the fault in the network-connected device 100, it is possible to suggest appropriate recovery processing to the user.

As described above, according to the present embodiment, the LE
When a failure occurs in the device itself or a failure occurs in a network connected to the device, the D display unit 119 links a plurality of L levels by linking the degree of the failure and the frequency of blinking.
By blinking the corresponding LED among the EDs 111 to 114 and 116, the failure site can be easily visually checked by the corresponding LED. Can be easily visually checked.

(Embodiment 3) The configuration of a network connection device according to Embodiment 3 of the present invention is the same as that of FIG.
The description is omitted. This embodiment is different from the first embodiment in the operation of the management unit 107.

FIG. 3 is a configuration diagram showing a network system including the network connection device 100 according to the third embodiment of the present invention. In FIG. 3, WAN1, LAN
3, network terminal device 4, network connection device 1
Since 00 is the same as FIG. 5 and FIG. 1, the same reference numerals are given and the description is omitted.

The operation of the network system thus configured will be described with reference to FIG. FIG. 4 is an enlarged view of a screen 4a of the network terminal device 4 as the network terminal device.

In FIG. 4, on the screen 4a of the network terminal device 4, the LED display section 119 and the button operation section 120 (see FIG. 2) of the network connection device 100 are located at the same positions as the actual ones, and the functions such as LEDs and buttons are provided. Is enlarged and displayed so that the user can understand. That is, the management unit 107 of the network connection device 100 includes the LEDs 111 to 11
4, 116 and buttons 117 and 118 (see FIG. 2) and the display information and position information are transmitted to the network terminal device 4 via the LAN 3, and the network terminal device 4 displays the LEDs and buttons based on the received information. And place it.
Then, the operation status visualized by blinking of each LED or the like is also displayed on the screen 4a in the same manner as that occurring in the actual network connection device 100. This allows
Even if the user does not go to the place where the network connection device 100 is directly arranged, the operation status of the device can be confirmed from a remote place.

As described above, according to the present embodiment, the management unit 107 includes the second network interface unit 10
By displaying the LED display unit 119 on the screen of the network terminal device 4 connected via 1, 102 or 103, including the lighting / flashing display of the LED,
The operation status is displayed on the network terminal device 4, and the operation status of the network connection device 100 can be easily visually checked from the remote network terminal device 4 without directly going to the installation location of the network connection device 100.

(Embodiment 4) The configuration of a network connection device according to Embodiment 4 of the present invention is the same as that of FIG.
The description is omitted. This embodiment is different from the first embodiment in the operation of the management unit 107. Further, the network system according to the present embodiment has the same configuration as that of FIG. 3, and the network terminal device 4 performs a screen display as shown in FIG.

The operation of the network system configured as described above will be described.

In the present embodiment, as described above, the screen 4a of the network terminal device 4 has the L shown in FIG.
ED is displayed and the network terminal device 4 such as a mouse
Using the input device provided by the user, the LED on the screen 4a is designated by clicking with a mouse or the like. Then, screen 4a
A pop-up appears on the top,
Communication history information such as failure information and statistical information of the network interface corresponding to the designated LED is displayed. That is, in response to an instruction from the network terminal device 4 by an input device such as a mouse, the management unit 107 of the network connection device 100 reads communication history information of the network interface units 101 to 104 corresponding to the designated LED from the memory 106, The communication history information is transmitted to the network terminal device 4 via the LAN 3,
The network terminal device 4 displays the received communication history information in a pop-up on the screen 4a. Thereby, the user can visually confirm detailed operation status information classified for each communication interface of the network connection device 100 from a remote place.

As described above, in this embodiment, the management unit 1
07 is a second network interface unit 101,
The LED display unit 119 is displayed on the screen of the network terminal device 4 connected via the interface 102 or 103, including the lighting / blinking display of the LED. By specifying one of them, communication history information such as fault information and statistical information of the device itself and the network interface unit corresponding to the specified LED among the first and second network interface units 101 to 104 is transmitted to the network terminal device 4. The communication history information is displayed on the network terminal device 4 by displaying the information on the LED display unit on the screen 4a of the network connection device 10.
It is not necessary to confirm the communication history information of the network connection device 100 at 0, and the communication history information of the network connection device 100 can be easily visually checked from the remote network terminal device 4.

(Embodiment 5) The configuration of a network connection device according to Embodiment 5 of the present invention is the same as that of FIG.
The description is omitted. This embodiment is different from the first embodiment in the operation of the management unit 107. Further, the network system according to the present embodiment has the same configuration as that of FIG. 3, and the network terminal device 4 performs a screen display as shown in FIG.

The operation of the network system configured as described above will be described.

In this embodiment, as described above, the buttons shown in FIG. 4 are displayed on the screen 4a of the network terminal device 4, and the network terminal device 4 such as a mouse is displayed.
A button on the screen 4a is designated by clicking with a mouse or the like using the input device of the user. Then, the management unit 1
07 actually performs operations such as restarting the network connection device 100 assigned to the button and performing all initialization. As a result, the user can forcibly perform the management operation on the network-connected device 100 from a remote location without going to the location of the actual network-connected device 100.

As described above, in this embodiment, the management unit 1
07 is a second network interface unit 101,
The button operation unit 120 including a plurality of buttons is displayed on the screen of the network terminal device 4 connected via 102 or 103, and an input device such as a mouse of the network terminal device 4 is displayed on the screen 4a of the network terminal device 4. By specifying any one of the plurality of buttons, the same restart and all initialization operations as when the specified button is pressed are performed, so that the device is located at a location remote from the network connection device 100. The network terminal device 4 can easily restart the network connection device 100 or perform all initialization.

[0058]

As described above, according to the network connection device of the first aspect of the present invention, a first network interface unit comprising at least one kind of physical layer connected to an external network such as the Internet,
A second network interface unit comprising at least one kind of physical layer connected to an internal network such as a LAN, a communication control unit for controlling input / output communication in the first and second network interface units, failure information, and statistical information A memory for storing communication history information such as
A management unit for diagnosing a failure of the device itself and notifying the failure, a display unit provided with a plurality of displays, and a display control unit for controlling display of the display units, wherein the display control unit is a display unit. Lights up
By flashing and notifying the operating status, the user can easily visually check the fault site by selecting a display to be turned on or flashing from among a plurality of displays. In this case, there is an advantageous effect that the degree of the obstacle can be easily visually checked.

According to the network connection device of the second aspect, in the network connection device of the first aspect, the display unit is configured such that when a failure occurs in the device itself or a failure occurs in a network connected to the device. At times, by linking the degree of failure and the frequency of blinking and blinking the corresponding one of the plurality of displays, the failure site can be easily visually checked by the corresponding display, By linking the frequency to the level of the failure, the advantageous effect that the degree of the failure can be easily visually checked can be obtained.

According to the third aspect of the present invention, in the first aspect of the present invention, the management unit displays on the screen of the network terminal device connected via the second network interface unit. The operation status is displayed on the network terminal device by displaying the part including the lighting and blinking display of the display, so that the network connection can be made from a remote network terminal device without going directly to the installation location of the network connection device. An advantageous effect is obtained in that the operation status of the device can be easily visually checked.

According to the network connection device of the fourth aspect, in the network connection device of the first aspect, the management unit displays on the screen of the network terminal device connected via the second network interface unit. The device itself and the first and second networks are displayed by displaying the display unit including the lighting / flashing display of the display device and specifying one of the plurality of display devices from an input device such as a mouse of a network terminal device. By displaying communication history information such as fault information and statistical information of the network interface unit corresponding to the specified display unit of the interface unit on the display unit on the screen of the network terminal device, the communication history information is displayed on the network terminal device So that
It is not necessary to directly check the communication history information of the network connection device with the network connection device, and the advantageous effect that the communication history information of the network connection device can be easily visually checked from a remote network terminal device is obtained.

According to the network connection device of the fifth aspect, the first network interface unit composed of at least one kind of physical layer connected to an external network such as the Internet and the at least one network interface unit connected to an internal network such as a LAN. A second network interface unit composed of different types of physical layers, a communication control unit for controlling input / output communication in the first and second network interface units, and a communication unit for storing communication history information such as fault information and statistical information. It has a memory, a management unit for diagnosing a failure of the device itself and notifying the failure, and a button operation unit provided with a plurality of buttons, and the management unit presses any one of the plurality of buttons. By restarting the device and performing all initialization, the device can be restarted and all initialization can be performed easily. Advantageous effect can be carried out directly and explicitly without passing through the communication interface the management operation is obtained.

According to the network connection device of the sixth aspect, in the network connection device of the fifth aspect, the management unit includes a button on a screen of the network terminal device connected via the second network interface unit. When the operation unit is displayed including a plurality of buttons, and the specified button is pressed by specifying one of the plurality of buttons on the screen of the network terminal device from an input device such as a mouse of the network terminal device. The same restart and all-initialization operations as described above can be performed, and the network-connected device can be easily restarted and fully initialized from a network terminal device located at a location remote from the network-connected device. Effects can be obtained.

[Brief description of the drawings]

FIG. 1 is a block diagram showing network connection devices according to Embodiments 1, 2, 3, 4, and 5 of the present invention.

FIG. 2 is a plan view showing an LED display unit and a button operation unit of the network connection device of FIG. 1;

FIG. 3 is a configuration diagram showing a network system including a network connection device according to a third embodiment of the present invention;

FIG. 4 is an enlarged view of a screen of a PC as a network terminal device.

FIG. 5 is a block diagram showing a network system having a conventional network connection device.

[Explanation of symbols]

101, 102, 103 LAN interface unit (second network interface unit) 104 WAN interface unit (first network interface unit) 105 communication control unit 106 memory 107 management unit 108 LED display unit (display unit) 109 input processing unit 110 bus

Claims (6)

[Claims] 1. A first network interface unit comprising at least one kind of physical layer connected to an external network such as the Internet, and a second network interface consisting of at least one kind of physical layer connected to an internal network such as a LAN. Unit, a communication control unit for controlling input / output communication in the first and second network interface units, a memory for storing communication history information such as fault information and statistical information, and diagnosing a fault in the device itself. And a display unit provided with a plurality of indicators, and a display controller for controlling the display of the indicators, wherein the display controller turns on and blinks the indicators. A network connection device for notifying an operation status by letting the user know the operation status. 2. The display unit according to claim 1, wherein when a failure occurs in the device itself or when a failure occurs in a network connected to the device, the degree of the failure and the frequency of blinking are linked to each other to display the plurality of displays. 2. The network connection device according to claim 1, wherein the corresponding display blinks. 3. The management unit displays the display unit on a screen of a network terminal device connected via the second network interface unit, including a lighting / flashing display of the display unit. The network connection device according to claim 1. 4. The network terminal according to claim 1, wherein the management unit displays the display unit on a screen of the network terminal device connected via the second network interface unit, including a lighting / flashing display of the display unit. By specifying one of the plurality of displays from an input device such as a mouse of the device, a network interface unit corresponding to the specified display device among the device itself and the first and second network interface units Fault information,
The network connection device according to claim 1, wherein communication history information such as statistical information is displayed on a display unit on a screen of the network terminal device. 5. A first network interface unit composed of at least one physical layer connected to an external network such as the Internet, and a second network interface composed of at least one physical layer connected to an internal network such as a LAN. Unit, a communication control unit for controlling input / output communication in the first and second network interface units, a memory for storing communication history information such as fault information and statistical information, and diagnosing a fault in the device itself. And a button operation unit provided with a plurality of buttons. The management unit is configured to restart or restart the device by pressing one of the plurality of buttons. A network connection device characterized by performing initialization. 6. The management unit displays the button operation unit including the plurality of buttons on a screen of a network terminal device connected via the second network interface unit, and controls a mouse of the network terminal device. By specifying any one of a plurality of buttons on the screen of the network terminal device from an input device such as the above, the same restart and all initialization operations as when the specified button is pressed are performed. The network connection device according to claim 5, wherein