JP4969404B2 - Mechanism for preventing malfunction of wire concentrator having anti-theft function, wire concentrator and anti-theft system - Google Patents

Description

  BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a malfunction-preventing mechanism for a line concentrator having a theft prevention function, a line concentrator, and an antitheft system, and particularly useful when applied to accurately detect theft of an information communication terminal connected to the line concentrator It is.

  In recent years, information communication terminals such as personal computers have come to be used in close relation to business with the improvement of processing capability, and play an important role in the performance of business in companies and the like. On the other hand, management of information communication terminals becomes complicated as information communication terminals are highly developed, and the burden on management work such as maintenance and operation of hardware and software and troubleshooting is increasing.

  Furthermore, in recent years, theft of expensive information communication terminals themselves and information communication terminals for the purpose of obtaining information stored in them has occurred, and it is also managed to take measures to prevent this theft. Is increasing the burden on people. Especially in organizations with large networks such as companies, academic institutions, hospitals, etc., many information communication terminals may be installed in physically dispersed locations, and the administrator can connect these information communication terminals directly. Since it is difficult to monitor, efficient anti-theft measures are required.

  The technology for preventing or detecting theft of the information communication terminal includes a restraining tool (see Patent Document 1) that prevents the information communication terminal from being taken out by attaching the information communication terminal to a desk or wall, and various sensors to detect the inclination of the information communication apparatus. An anti-theft device that prevents theft by issuing an alarm (see Patent Document 2), a personal computer monitoring system that monitors the location of the information communication terminal via wireless communication means and prevents the theft of the information communication terminal ( An anti-theft device for preventing theft by issuing an alarm on the condition that a dedicated cable is connected to the information communication terminal and the removal of the dedicated cable is electrically detected (see Patent Document 3) )

  However, in the restraint tool disclosed in Patent Document 1, when the restraint tool is cut and stolen, the administrator cannot immediately notice that the information communication terminal has been stolen, and promptly responds after the theft. Can not do. In the anti-theft device disclosed in Patent Document 2, since it is necessary to attach various sensors for detecting inclination or the like to individual information communication terminals, the cost and the burden of installation work increase in proportion to the number of information communication terminals. There's a problem. In addition, in the personal computer monitoring device disclosed in Patent Document 3, it is necessary to attach a wireless device to be attached to each information communication terminal. However, since the wireless device does not function unless the information communication terminal is turned on, thorough theft It does not provide a prevention function.

  Furthermore, in the anti-theft device disclosed in Patent Document 4, not only is the beauty of the information communication terminal attached separately to the information communication terminal, but also the information communication terminal is clearly informed that anti-theft measures are taken. It will be. As a result, there is a possibility that a clever trick to avoid such anti-theft measures may be taken. For example, by providing an electrical bypass circuit in the dedicated cable, the information communication terminal can be stolen without causing the anti-theft device to detect the removal of the dedicated cable.

  In order to solve such a problem, a concentrator such as a switch provided with a theft prevention function may be employed. For example, among the signal lines constituting the communication cable connecting the information communication terminal and the line concentrator, a line concentrator that uses unused signal lines for theft monitoring of the information communication terminal can be mentioned. Specifically, when the information communication terminal and the line concentrator are connected by a communication cable, a monitoring voltage is always applied to an unused signal line. When the communication cable is pulled out from the information communication terminal due to theft, the voltage applied to the monitoring signal line changes. Thereby, the concentrator can detect that the information communication terminal has been stolen based on the change in the voltage, and can issue an alarm or the like.

  However, the communication cable is not pulled out from the information communication terminal only in the case of theft. For example, when changing the installation location of an information communication terminal, or when taking it temporarily to another place with the permission of the administrator, the communication cable may be temporarily pulled out from the information communication terminal. . As described above, the conventional line concentrator having the anti-theft function has a problem that it cannot issue an alarm by distinguishing whether the communication cable is pulled out or not.

Japanese Patent Laid-Open No. 11-148262 Registered Utility Model No. 3096865 JP-A-5-176374 JP-A-9-27087

  In view of such circumstances, the present invention provides a malfunction prevention mechanism, a line concentrator, and a theft prevention system for a line concentrator having a theft prevention function capable of accurately detecting theft of an information communication terminal connected to the line concentrator. Objective.

  In order to achieve the above object, a first aspect of the present invention is a communication cable plug including a monitoring signal line that forms a closed circuit and a signal line that transmits communication data via a contact of a connector of an information communication terminal. A mechanism for preventing malfunction of a wire concentrator having an anti-theft function configured to detect by an alarm means that the closed circuit is opened by being pulled out of the connector, wherein the plug is inserted into the connector. In order to maintain the mounted state, the plug having a lever portion that is an elastic body that can be engaged with the locking projection provided on the connector, and the engagement between the lever portion and the locking projection are released. A short-circuit means attached to the lever portion so as to maintain the closed circuit state by short-circuiting the monitoring signal line, and the short-circuit hand when the plug is inserted and attached. In malfunction preventing mechanism concentrator having antitheft function, characterized by comprising a plug cover configured to maintain a short-circuit of the monitoring signal line by.

  In the first aspect, even if the communication cable is pulled out from the connector of the information communication terminal, the monitoring signal line is kept short-circuited by the short-circuit means, so the line concentrator does not issue an alarm. Even if the communication cable is attached to the plug cover, the short-circuit of the monitoring signal line is maintained. Even in this case, the concentrator does not issue an alarm. On the other hand, a person who intends to steal the information communication terminal pulls out the information communication terminal and leaves the communication cable, and the monitoring signal line does not form a closed circuit, and the concentrator issues an alarm. In this way, it is possible to distinguish between whether or not the communication cable is pulled out from the information communication terminal due to theft and to issue an alarm accurately.

  According to a second aspect of the present invention, in the malfunction prevention mechanism for the wire concentrator having the anti-theft function described in the first aspect, the plug cover is provided with a short-circuit portion for short-circuiting the monitoring signal line. There is a malfunction prevention mechanism for a concentrator having a theft prevention function.

  In the second aspect, the monitoring signal line can be reliably short-circuited by providing the plug cover with the short-circuit portion.

  According to a third aspect of the present invention, in the malfunction prevention mechanism for a wire concentrator having the anti-theft function described in the first or second aspect, the lever portion has a distal end centered on the base end portion. The tip portion is configured to be urged in a direction away from the plug while rotating, and the short-circuit means is configured to rotate the tip portion of the lever portion in a direction approaching the plug side. It is in the malfunction prevention mechanism of the concentrator which has the anti-theft function characterized by being short-circuited to the monitoring signal line.

  In this third aspect, when the plug is pulled out from the connector of the information communication terminal, the lever can be turned to release the engagement, and at the same time, the monitoring signal line can be short-circuited. Thereby, the operation | work which pulls out a plug from the connector of an information communication terminal can be performed smoothly.

  According to a fourth aspect of the present invention, there is provided a concentrator comprising the malfunction prevention mechanism for the concentrator having the anti-theft function described in any one of the first to third aspects.

  In the fourth aspect, there is provided a line concentrator that accurately distinguishes whether or not it is due to theft that the communication cable is pulled out from the information communication terminal.

  According to a fifth aspect of the present invention, there is provided a theft prevention system comprising the concentrator described in the fourth aspect and an information communication terminal having a connector provided with a contact for short-circuiting the monitoring signal line. It is in.

  In the fifth aspect, there is provided an anti-theft system including a line concentrator that distinguishes whether or not it is due to theft that the communication cable is pulled out from the information communication terminal.

  According to a sixth aspect of the present invention, in the anti-theft system according to the fifth aspect, the information processing terminal management server is connected so as to be communicable with the line concentrator, and the line concentrator is connected to the communication by the alarm means. When it is detected that the cable has been pulled out from the connector, the information communication terminal management server has pull-out information transmitting means for sending out pull-out information including the identifier of the connector to which the pulled-out communication cable is connected. The communication terminal management server determines whether the information communication terminal connected to the connector specified by the identifier is pulled out from the line concentrator based on the identifier included in the extraction information received from the line concentrator. An anti-theft system having terminal management means for managing.

  In the sixth aspect, it is possible to intensively grasp the connection status between the information communication terminal and the line concentrator installed in each place, and it is possible to quickly cope with theft.

  According to the present invention, when a communication cable is pulled out from an information communication terminal, an alarm can be issued only for pulling out when it is theft, and no alarm can be issued when pulling out when it is not theft.

  Hereinafter, the best mode for carrying out the present invention will be described. The description of the present embodiment is an exemplification, and the present invention is not limited to the following description.

<Embodiment 1>
First, prior to a malfunction prevention mechanism for a line concentrator having a theft prevention function according to the present embodiment, a theft prevention system including the line concentrator will be described.

  FIG. 1 is a schematic diagram showing an external appearance of a line concentrator and an information communication terminal having an anti-theft function according to Embodiment 1, and FIG. 2 is a schematic diagram showing a configuration of a communication cable including a surplus communication line and a terminal-side connector. 3 is a block diagram of the concentrator having the anti-theft function according to the first embodiment, and FIG. 4 is a circuit diagram of the concentrator having the anti-theft function according to the first embodiment.

  Using these figures, when the information communication terminal 40 connected to the line concentrator 10 via the LAN cable 20 is stolen, the line concentrator 10 detects the pulling of the LAN cable 20 due to the theft, and the information communication A case where the terminal 40 is prevented from being stolen will be described.

  As shown in FIG. 1, the anti-theft system 1 transmits communication data between a line concentrator 10 that relays transmission of communication data of an information communication terminal 40 and another information communication terminal 40 via the line concentrator 10. And an information communication terminal 40 for transmitting and receiving.

  Further, plugs 21 are provided at both ends of the LAN cable 20, and the plugs 21 can be detachably attached to the connector 11 of the line concentrator 10 and the connector 41 of the information communication terminal 40. Hereinafter, “device-side connector 11 of concentrator 10” is referred to as “device-side connector 11”, and “connector 41 of information communication terminal 40” is referred to as “terminal-side connector 41”.

  In FIG. 1, only one information communication terminal 40 is connected to the line concentrator 10, but the line concentrator 10 is provided with a plurality of device-side connectors 11, and a plurality of information communication terminals 40 are connected. The terminal 40 may be connected, or other devices such as the line concentrator 10 and a router may be connected.

  FIG. 2 shows a schematic configuration of the LAN cable 20 and the terminal-side connector 41. As shown in the figure, the LAN cable 20 is a UTP (Unshielded Twist Pair) cable (straight). In this LAN cable 20, signal wires 101, 102, 103, 104, 105, 106, 107, 108 which are eight conductors are inserted inside the sheath 23. One end of each signal line 101 to 108 is crimped to each of the plurality of metal contacts 22 of the plug 21. Although not shown, the other ends of the signal lines 101 to 108 are also crimped to the contact 22 of the plug 21 on the opposite side. For the sake of simplicity, each signal line in the figure is given only the reference numerals “101, 108”, and the reference numerals 102 to 107 are not shown.

  Further, a protrusion 24 is provided at the tip of the plug 21, and a lever 25 is provided on the plug 21 via the protrusion 24. The lever portion 25 is an elastic body in which the distal end portion rotates up and down with the base end portion as a rotation center, and the distal end portion is urged upward (in a direction away from the plug 21).

  When the plug 21 is connected to the terminal-side connector 41, the stepped portion 26, which is an engaging portion provided at the base end portion of the lever portion 25, engages with the locking projection 45 of the terminal-side connector 41. As a result, the plug 21 is prevented from dropping from the terminal-side connector 41. On the other hand, when the lever portion 25 is pushed down (in the direction approaching the plug 21) in a state where the step portion 26 and the locking projection portion 45 are engaged, the engagement between the step portion 26 and the locking projection portion 45 is achieved. And the plug 21 can be removed from the terminal-side connector 41.

  Further, the plug 21 is provided with a short-circuit member 50 as a short-circuit means for preventing malfunction of the device-side connector 11 of the concentrator 10. Details of the short-circuit means will be described later.

  On the other hand, the terminal-side connector 41 is provided with a total of eight metal contacts 42 corresponding to the respective contacts 22 of the plug 21. Each of these contacts 42 is connected to a predetermined circuit inside the information communication terminal 40. Although not shown, the device side connector 11 of the concentrator 10 is also provided with a total of eight metal contacts 12 (see FIG. 3) corresponding to each contact 22 of the plug 21, as with the terminal side connector 41. ing. Each of these contacts 12 is connected to a predetermined circuit inside the concentrator 10.

  When the plug 21 is attached to each device-side connector 11 or the terminal-side connector 41, the contact 12 and the contact 22, and the contact 22 and the contact 42 are brought into contact with each other, so that the concentrator 10 and A predetermined circuit of the information communication terminal 40 is electrically connected.

  Hereinafter, “contact 12 of device-side connector 11” is “device-side contact 12”, “contact 42 of terminal-side connector 41” is “terminal-side contact 42”, and “contact 22 of plug 21” is “LAN cable contact 22”. Called.

  Here, each of these signal lines 101 to 108 is numbered 1 to 8 based on a standard (TIA / EIA 568-A or 568-B) defined by the American Electronics Industry Association / Telecommunications Industry Association. Has been. On the other hand, in the Ethernet (registered trademark) standard (IEEE802.3 (10Base-T) or IEEE802.3u (100Base-TX)) using the LAN cable 20 as a signal transmission medium, the number “1, 2, 3, 6” is used. It is stipulated that the signal lines 101 to 103 and 106 corresponding to are used for transmission / reception of electric signals.

  Therefore, the signal lines 104, 105, 107, and 108 corresponding to the remaining numbers “4, 5, 7, and 8” physically connect the line concentrator 10 and the information communication terminal 40, but are electrically connected. In this state, no signal is transmitted.

  In the present invention, the remaining four signal lines are used as monitoring signal lines. That is, it is detected that the LAN cable 20 is pulled out from the information communication terminal 40 using these monitoring signal lines. A case where two monitoring signal lines 104 and 105 corresponding to the numbers “4 and 5” are used will be described.

  FIG. 3 shows each circuit included in the line concentrator 10 and the information communication terminal 40 and the connection of the LAN cable 20 that connects these circuits.

  As shown in the figure, a LAN cable 20 is attached between the device-side connector 11 and the terminal-side connector 41, and the device-side contact 12 and the LAN cable contact 22, and the opposite LAN cable contact 22 and the terminal-side contact 42. And are in contact.

  By contact of each of these contacts 12, 22, 42, the signal lines 101 to 108 included in the LAN cable 20 connect predetermined circuits of the line concentrator 10 and the information communication terminal 40 so as to be conductive. Specifically, each of the signal lines 101 to 103 and 106 connects the communication data relay circuit 30 and the communication data transmission / reception circuit 44 so as to be conductive.

  Further, the terminal-side contacts 42 corresponding to the monitoring signal lines 104 and 105 are provided in advance with a short-circuit conductor 43 that is a conductor that short-circuits the monitoring signal lines 104 and 105 when the plug 21 is attached. On the other hand, the device side contact 12 corresponding to the monitoring signal line 104 is connected in advance to a detection circuit 31 for detecting the pull-out of the LAN cable 20, and the device side contact 12 corresponding to the monitoring signal line 105 is grounded in advance. ing.

  Accordingly, when the LAN cable 20 is attached to each device-side connector 11 and terminal-side connector 41, the closed circuit consisting of the detection circuit 31, the monitoring signal wires 104 and 105, and the short-circuit conductor 43 is connected via the contacts 12, 22, and 42. A circuit is formed. On the contrary, when the LAN cable 20 is pulled out from each device-side connector 11 and the terminal-side connector 41, this closed circuit is opened. That is, since the attachment / detachment of the LAN cable 20 corresponds to the formation / opening of the closed circuit, it is possible to determine the attachment / detachment of the LAN cable 20 by detecting that the closed circuit is formed / open. Yes.

  Of course, the closed circuit is opened not only when the LAN cable 20 is pulled out but also when the LAN cable 20 is disconnected. Therefore, the antitheft system 1 can also be used when the information communication terminal 40 is stolen by cutting the LAN cable 20. Can respond.

  The information communication terminal 40 has a general computer function, and includes a communication data transmission / reception circuit 44 that transmits / receives communication data of the information communication terminal 40 as an electrical signal conforming to the Ethernet (registered trademark) standard, and two monitors. And a terminal-side connector 41 provided with a terminal-side contact 42 for short-circuiting the signal lines 104 and 105 for use.

  The communication data transmission / reception circuit 44 converts communication data into an electrical signal conforming to the Ethernet (registered trademark) standard, and the communication data relay circuit of the line concentrator 10 via the signal lines 101 to 103 and 106 included in the LAN cable 20. 30 is used to convert the electrical signal received from the communication data relay circuit 30 and acquire communication data. This communication data is not particularly limited, and any data can be used as long as it can be handled by the information communication terminal 40.

  On the other hand, the line concentrator 10 is applied to the monitoring signal line 104 included in a closed circuit formed between the communication data relay circuit 30 that relays transmission of communication data of the information communication terminal 40 and the information communication terminal 40. A detection circuit 31 for detecting the pull-out of the LAN cable 20 based on the voltage to be detected, and an alarm circuit 32 for warning that the information communication terminal 40 has been stolen when the detection circuit 31 detects the pull-out of the LAN cable 20. It has.

  The communication data relay circuit 30 is used for relaying transmission of communication data of the information communication terminal 40 connected to the device-side connector 11. Specifically, the communication data relay circuit 30 is based on an address identifying the information communication terminal 40 included in communication data transmitted / received to / from the information communication terminal 40 via the signal lines 101 to 103, 106. The communication data is transmitted to the information communication terminal 40 having the address according to the Ethernet (registered trademark) standard. The target of the communication data to be relayed is not limited to the information communication terminal 40, but may be communication data relayed by another concentrator 10 or a relay device such as a router.

  The detection circuit 31 applies a monitoring voltage to the closed-circuit monitoring signal line 104 formed when the LAN cable 20 is attached to each device-side connector 11 and the terminal-side connector 41 (hereinafter, this voltage is referred to as “ The LAN cable 20 is connected to each device-side connector 11 and the terminal-side connector 41 based on the monitoring voltage when the LAN cable 20 is attached to each device-side connector 11 and the terminal-side connector 41 and pulled out. It is detected whether or not the terminal-side connector 41 is pulled out.

  The alarm circuit 32 is used to notify an administrator or the like that the LAN cable 20 of the information communication terminal 40 has been removed and stolen based on the monitoring voltage applied to the monitoring signal lines 104 and 105. . For example, a siren is sounded or a warning sound is emitted to notify. Moreover, you may use these notifications as a warning with respect to a thief. Thereby, the thief who notices the siren can abandon the theft of the information communication terminal 40.

  Next, a specific example of the circuit configuration of the line concentrator 10 and the information communication terminal 40 will be described with reference to FIG. As shown in the figure, the LAN cable 20 is connected to the device-side connector 11 of the line concentrator 10 and the terminal-side connector 41 of the information communication terminal 40, and the signal lines 101 to 103, 106 (signals) included in the LAN cable 20 are shown. (The lines 103 and 106 are not shown.) The communication data relay circuit 30 and the communication data transmission / reception circuit 44 are connected to each other via the contacts 12, 22, and 42 provided on the device-side connector 11 and the terminal-side connector 41. Connected so that conduction is possible.

  Similarly, the monitoring signal lines 104 and 105 included in the LAN cable 20 form a closed circuit from the line concentrator 10 to the information communication terminal 40 via the contacts 12, 22 and 42. Specifically, it is a closed circuit including a power supply 311 for applying a monitoring voltage, a monitoring signal line 104, a short-circuit conductor 43, a monitoring signal line 105, and a ground 312.

A monitoring voltage (a voltage value of this power supply is expressed as “V ₀ ”) is constantly applied to the monitoring signal line 104 from the power supply 311, and the potential at point A is from the terminal-side connector 41 of the LAN cable 20. It changes according to attachment and detachment.

Specifically, when the LAN cable 20 is attached to the terminal-side connector 41, the potential at the point A becomes equal to the potential at the ground 312. On the other hand, when the LAN cable 20 is pulled out from the terminal-side connector 41, the potential at the point A becomes equal to the monitoring voltage V _0.

  Therefore, the ringing of the siren 322 is controlled via the siren control circuit 321 by using the potential at the point A that changes as the LAN cable 20 is attached / detached as the input voltage of the gate electrode of the transistor 313.

More specifically, the transistor 313 functions as a switch element, and is turned on when the monitoring voltage V ₀ is applied to the gate electrode to drive the siren control circuit 321.

  As a result, the line concentrator 10 does not ring the siren 322 when the LAN cable 20 is connected to each device-side connector 11 and the terminal-side connector 41, while the LAN cable 20 is connected to each device-side connector 11 and the terminal. When it is pulled out from the side connector 41, the siren 322 is sounded. It is possible to notify an administrator or the like that the information communication terminal 40 has been pulled out by the ringing of the siren 322, and to prevent the information communication terminal 40 from being stolen.

  As described above, the terminal-side connector 41 is provided with the short-circuit lead wire 43 for short-circuiting the two monitoring signal lines to form a closed circuit. However, the present invention is not limited to this. For example, when the terminal side contact 42 of the terminal side connector 41 is provided with a grounding conductor so that one monitoring signal line is grounded, and the LAN cable 20 is attached to each device side connector 11 and the terminal side connector 41, The monitoring signal line may be configured to form a closed circuit via the terminal side contact 42. At this time, one end of the monitoring signal line is connected to the gate electrode of the transistor, a voltage for monitoring is always applied, and the voltage value is monitored by the transistor, whereby the LAN cable 20 is pulled out from the information communication terminal 40. Can be detected.

  As described above, when the information communication terminal 40 is stolen, the LAN cable 20 is pulled out. At this time, since the closed circuit is always opened, the voltage value of the monitoring voltage that accompanies the opening of the closed circuit. This pull-out can be detected based on the change in. The line concentrator 10 having the anti-theft function can notify or prevent the information communication terminal from being stolen by causing the siren to ring based on the detection of the withdrawal.

  Here, the malfunction prevention mechanism of the concentrator 10 having the anti-theft function according to the present embodiment will be described. FIG. 5A is a schematic perspective view of a LAN cable and a plug cover constituting the malfunction prevention mechanism according to the present embodiment, and FIGS. 5B and 5C are cross-sectional views illustrating a short-circuit means of the LAN cable. It is.

  The malfunction prevention mechanism according to the present embodiment includes a short-circuit member 50 provided on the LAN cable 20 and a plug cover 60. As shown in FIG. 5A, a short-circuit member 50 that is an example of a short-circuit unit is provided on the plug 21. Specifically, the short-circuit member 50 is composed of a conductive member that short-circuits the monitoring signal lines 104 and 105, and the base end portion of the short-circuit member 50 is connected to the lever portion 25. The short-circuit member 50 moves up and down in conjunction with the rotation of the lever portion 25.

  As shown in FIG. 5B, when the distal end portion of the lever portion 25 is positioned on the upper side, the short-circuit member 50 is separated from the monitoring signal lines 104 and 105 in conjunction with this, and monitoring is performed. The signal lines 104 and 105 are not short-circuited. On the other hand, as shown in FIG. 5C, when the distal end portion of the lever portion 25 is rotated and positioned on the lower side, the short-circuit member 50 is interlocked with this, and the distal end portion thereof is a monitoring signal. The monitoring signal lines 104 and 105 are short-circuited in contact with the lines 104 and 105.

  As described above, since the lever portion 25 is biased in the direction in which the tip end portion is separated from the plug 21, the monitoring signal lines 104 and 105 are normally connected to the short-circuit member 50 as shown in FIG. The state that is not short-circuited is maintained. Further, when the plug 21 is pulled out from the terminal-side connector 41 of the information communication terminal 40, the lever portion 25 is pushed down with a finger to release these engagements, and simultaneously with this depression, the monitoring signal lines 104, 105 are The short-circuit member 50 is short-circuited. That is, if the state in which the lever portion 25 is pushed down with the finger is continuously maintained, the short circuit of the monitoring signal lines 104 and 105 is maintained.

  Similar to the terminal-side connector 41, the plug cover 60 includes a connector 61 to which the plug 21 can be attached. The plug cover 60 includes a locking projection 65 that engages with the step portion 26 of the lever portion 25. When the plug 21 is attached to the plug cover 60, the locking projection 65 and the step portion are provided. 26 is engaged. As a result, the plug 21 does not fall off the connector 61. On the other hand, when the leading end portion of the lever portion 25 is pushed downward (in the direction approaching the plug 21) in a state where the locking projection portion 65 and the step portion 26 are engaged, the step portion 26 and the locking projection portion 65 Is disengaged, and the plug 21 can be removed from the connector 61.

  Further, the connector 61 of the plug cover 60 is provided with a short-circuit portion 62 that is a conductive member. The short-circuit portion 62 is formed in a U shape so that when the plug 21 is attached to the connector 61 of the plug cover 60, the contact 22 corresponding to the monitoring signal lines 104 and 105 is simultaneously contacted.

  FIG. 6 is a cross-sectional view when the LAN cable is attached to the plug cover. As shown in the figure, when the plug 21 is attached to the plug cover 60, the stepped portion 26 of the lever portion 25 and the locking projection 65 of the plug cover 60 are engaged, and the plug 21 does not come off the plug cover 60. It is in a state. At this time, since the contact 22 corresponding to the monitoring signal lines 104 and 105 is in contact with the short-circuit portion 62, the monitoring signal lines 104 and 105 can be kept short-circuited. Even if the lever portion 25 is urged upward by the short-circuit portion 62 and the short-circuit member 50 is separated from the monitoring signal lines 104 and 105, the monitoring signal wires 104 and 105 can be reliably short-circuited. It has become.

  As described above, the monitoring signal lines 104 and 105 are in contact with the short-circuit member 50 to the short-circuit portion 62 when (1) the lever portion 25 is pushed down and (2) when the plug cover 60 is attached. Are shorted. That is, in the cases (1) and (2), the monitoring signal lines 104 and 105 always form a closed circuit, so that the line concentrator 10 does not issue an alarm.

  For example, when the LAN cable 20 is removed from the information communication terminal 40 and the installation location is changed, the lever portion 25 is pushed down to engage the locking projection 45 of the terminal-side connector 41 and the step portion 26 of the plug 21. Unplug the plug 21 from the terminal-side connector 41. At this time, since the lever portion 25 is pushed down, the monitoring signal lines 104 and 105 are short-circuited, so that the line concentrator 10 does not issue an alarm.

  Then, the plug cover 60 is attached to the plug 21 while the lever portion 25 is kept pressed down. Thereby, since the short circuit of the monitoring signal lines 104 and 105 is maintained via the short circuit part 62 of the plug cover 60, the concentrator 10 does not emit an alarm.

  On the other hand, since the person who intends to steal the information communication terminal 40 does not have the plug cover 60, the LAN cable 20 is removed from the information communication terminal 40 and then the lever part 25 is released. The short circuit of the signal lines 104 and 105 is released, and the line concentrator 10 issues an alarm.

  According to the malfunction prevention mechanism of the concentrator having the anti-theft function described above, when the LAN cable 20 is pulled out from the information communication terminal 40, an alarm is issued from the concentrator only when the LAN cable 20 is stolen, and it is not theft. It is possible to prevent an alarm from being issued in case of withdrawal.

<Embodiment 2>
In the second embodiment, similarly to the first embodiment, the theft of the information communication terminal 40 is detected and prevented, and the theft in the case where the information communication terminal management server 80 centrally manages whether or not the information communication terminal 40 has been stolen. An embodiment of the prevention system 100 will be described.

  FIG. 7 is a block diagram of the anti-theft system according to the second embodiment. Of the configuration of the antitheft system 100 according to the second embodiment, the description of the components denoted by the same reference numerals as those of the line concentrator 10 described in the first embodiment is omitted.

  The anti-theft system 100 differs from the anti-theft system 1 in that it includes an information communication terminal management server 80 that centrally manages whether or not the information communication terminal 40 has been stolen, and the line concentrator 10A prevents the information communication terminal 40 from being stolen. This is to notify the information communication terminal management server 80 of the detection.

  Each information communication terminal 40 is connected to the line concentrator 10A via the LAN cable 20, and the line concentrator 10A is communicably connected to the information communication terminal management server 80 via the LAN 70. For example, a unique IP address (IP: Internet Protocol) is assigned to each of the line concentrator 10A and the information communication terminal management server 80, and communication destinations are specified using the IP address and a predetermined TCP or UDP port number. Arbitrary data can be transmitted and received between the line concentrator 10A and the information communication terminal management server 80.

  Although only one concentrator 10A is illustrated in FIG. 7, a plurality of concentrators 10A may be connected to the information communication terminal management server 80 via the LAN 70 or other concentrator 10A.

  The line concentrator 10 </ b> A is further provided with a drawing information transmission unit 33 in addition to the line concentrator 10 of the first embodiment.

  The pull-out information transmitting means 33 receives the pull-out information including the identifier of the device-side connector 11 to which the pulled-out LAN cable 20 is connected when detecting that the LAN cable 20 has been pulled out from the concentrator 10A. Transmit to the management server 80. Here, the identifier of the device-side connector 11 is a numerical value that uniquely identifies each of the plurality of device-side connectors 11 included in the concentrator 10.

  Specifically, a packet including a header part including the IP address of the line concentrator 10A and a predetermined port number and an identifier of the apparatus-side connector 11 is created and transmitted to the information communication terminal management server 80 via the LAN 70. .

  The information communication terminal management server 80 has a general computer function, and the information communication terminal 40 connected to the connector is connected to the LAN cable 20 according to the withdrawal information received from the line concentrator 10A via the LAN 70. The terminal management means 81 which outputs to the output device, such as a display, and notifies an administrator that it was removed from the terminal is provided.

  The terminal management means 81 stores the received extraction information in a database, and appropriately searches for and outputs the extraction information in response to a request from the administrator. Thereby, the manager can limit the installation location, for example, and can confirm the connection status of the information communication terminal 40 with the line concentrator 10A at the installation location.

  In the antitheft system 100 having the configuration described above, the line concentrator 10A detects the pulling of the LAN cable 20 from the information communication terminal 40 and transmits the pulling information, and the information communication terminal management server 80 manages this pulling information. . As a result, the administrator can intensively grasp the connection status between the information communication terminal 40 installed at each location and the line concentrator 10A, and can quickly cope with theft. Further, since the line concentrator 10A includes the malfunction prevention mechanism described in the first embodiment, it is possible to accurately detect the theft of the information communication terminal 40.

  It should be noted that SNMP (Simple Network Management Protocol), which is an existing communication protocol for network management, may be used for exchanging this extraction information. That is, generally installed software or the like that implements SNMP is introduced into the information communication terminal management server 80 so as to function as a so-called “SNMP manager”. The management information base is provided with an “SNMP agent” function to be transmitted to the SNMP manager, and is configured to exchange the extraction information according to SNMP.

  By providing an SNMP agent function in the line concentrator 10A, the information communication terminal management server 80 can add the line concentrator 10A to the management target of the network management system using the existing SNMP. As a result, there is no cost for separately installing special software / equipment, etc., and the administrator efficiently grasps the drawing of the LAN cable 20 from the information communication terminal 40 by the line concentrator 10A using a mastered network management system. can do.

<Other embodiments>
In the first embodiment, when the plug 21 is attached to the plug cover 60, the short-circuit unit 62 short-circuits the monitoring signal lines 104 and 105. However, the present invention is not limited to this. FIG. 8 is a cross-sectional view of a plug cover and a short-circuit means that constitute a malfunction prevention mechanism according to another embodiment. In addition, the same code | symbol is attached | subjected to the same thing as Embodiment 1, and the overlapping description is abbreviate | omitted.

  Unlike the plug cover 60 according to the first embodiment, the plug cover 60 </ b> A illustrated in FIG. 8A is not provided with the short-circuit portion 62. However, the opening of the plug cover 60 is adjusted so that the short-circuit member 50 contacts the monitoring signal lines 104 and 105 even when the plug 21 is attached. Therefore, it is possible to maintain the state in which the monitoring signal lines 104 and 105 are short-circuited. Further, as shown in FIG. 8B, the plug cover 60B has the short-circuit member 50 in contact with the monitoring signal lines 104 and 105 and the short-circuit portion 62 even when the plug 21 is attached. Also good. In short, the plug cover only needs to be formed so that the monitoring signal lines 104 and 105 are short-circuited.

  INDUSTRIAL APPLICABILITY The present invention can be used in the industrial field in which products / systems that prevent theft of distributed information communication terminals are manufactured, sold, or used.

It is the schematic which shows the external appearance of the line | wire concentration apparatus and information communication terminal which have the antitheft function which concern on Embodiment 1. FIG. It is the schematic which shows the structure of the communication cable containing a surplus communication line, and a terminal side connector. It is a block block diagram of the concentrator which has a theft prevention function which concerns on Embodiment 1. FIG. 1 is a circuit diagram of a line concentrator having a theft prevention function according to Embodiment 1. FIG. FIG. 3 is a schematic perspective view of a LAN cable and a plug cover constituting the malfunction prevention mechanism according to Embodiment 1, and a cross-sectional view for explaining a LAN cable short-circuit means. It is sectional drawing when a LAN cable is attached to a plug cover. It is a block block diagram of the antitheft system which concerns on Embodiment 2. It is sectional drawing of the plug cover and short circuit means which comprise the malfunction prevention mechanism which concerns on other embodiment.

Explanation of symbols

10, 10A Concentrator 11 Device-side connector 12 Concentrator-side contact 20 LAN cable 21 Plug 22 LAN cable contact 23 Cover 30 Communication data relay circuit 31 Detection circuit 32 Alarm circuit 40 Information communication terminal 41 Terminal-side connector 42 Terminal-side contact 43 Short circuit Conductor 44 Communication data transmission / reception circuit 45 Locking projection 50 Short-circuit member 60, 60A, 60B Plug cover 61 Connector 62 Short-circuit 65 Locking projection 70 LAN
80 Information communication terminal management server 81 Terminal management means 100 Anti-theft system 101, 102, 103, 106 Signal line 104, 105, 107, 108 Monitoring signal line

Claims (6)

The closed circuit is opened when the plug of the communication cable including the signal line for monitoring forming a closed circuit and the signal line for transmitting communication data through the contact of the connector of the information communication terminal is pulled out from the connector. Is a malfunction prevention mechanism of a concentrator having an anti-theft function configured to detect an alarm means,
A plug having a lever portion that is an elastic body that can be engaged with a locking projection provided on the connector in order to maintain the plug inserted and attached to the connector;
Short-circuit means attached to the lever portion so as to maintain the closed circuit state by short-circuiting the monitoring signal line when the lever portion and the locking projection portion are disengaged;
And a plug cover configured to maintain a short-circuit of the monitoring signal line by the short-circuit means when the plug is inserted and attached, and a malfunction of the concentrator having an anti-theft function Prevention mechanism. In the malfunction prevention mechanism of the concentrator having the anti-theft function according to claim 1,
A malfunction prevention mechanism for a wire concentrator having a theft prevention function, wherein the plug cover is provided with a short-circuit portion for short-circuiting the monitoring signal line. In the malfunction prevention mechanism of the concentrator having the anti-theft function according to claim 1 or claim 2,
The lever portion is configured such that a distal end portion thereof is rotated about a proximal end portion as a rotation center and the distal end portion is biased in a direction away from the plug,
The concentrator having an anti-theft function, wherein the short-circuit means is configured to short-circuit to the monitoring signal line when the tip of the lever portion rotates in a direction approaching the plug side. Malfunction prevention mechanism.   A line concentrator comprising the malfunction prevention mechanism for the line concentrator having the antitheft function according to any one of claims 1 to 3. A line concentrator according to claim 4;
An anti-theft system comprising an information communication terminal having a connector provided with a contact for short-circuiting the monitoring signal line. In the anti-theft system according to claim 5,
Comprising an information communication terminal management server communicably connected to the line concentrator,
When the concentrator detects that the communication cable has been pulled out from the connector by the alarm means, pulls out information including an identifier of the connector to which the pulled out communication cable is connected to the information communication terminal management server. It has extraction information transmission means for transmitting,
The information communication terminal management server determines whether the information communication terminal connected to the connector specified by the identifier is pulled out from the line concentrator based on the identifier included in the extraction information received from the line concentrator. An anti-theft system comprising terminal management means for managing

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