JP2008206315A - Coupling/decoupling device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a coupling/decoupling device that enhances a resonance frequency while preventing a lightning-surge overvoltage, applied to a device to be tested, from being applied to a counter device being communication equipment such as IT equipment not as a test target. <P>SOLUTION: The coupling/decoupling device is provided with a common mode choke coil 310 composed by serially connecting a plurality of air-cored cylindrical coils (3061-3091) for allowing an xDSL communication signal to pass therethrough. Capacitance occurring between windings is maximally suppressed so as to improve a resonance frequency. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an overvoltage of an IT device or the like when a lightning surge overvoltage is applied to a communication device such as an IT (Information Technology) device connected to an xDSL (x Digital Subscriber Line) high-speed always-on communication network. The present invention relates to a coupling / decoupling device used in a lightning surge test circuit for evaluating a proof stress characteristic.

  Under the rapid increase in Internet usage accompanying broadband networks, the use of high-speed digital transmission signals such as xDSL is always connected to metal subscriber lines compared to conventional voice transmission signals. ing.

  With the spread of always-on communication, there is a demand for improved reliability against lightning surges in xDSL IT equipment and the like. These IT devices tend to have a reduced proof strength against lightning surge overvoltage because electronic devices to be used are driven at a low voltage and mounted with high density as the communication speed increases and the bandwidth increases. In addition to this, the number of constantly connected communication conditions has increased rapidly, and the probability of being exposed to lightning has increased.

  In order to improve this, it is necessary to evaluate the strength characteristics against lightning surge overvoltage of IT equipment and the like.

  As described in the test conditions of the overvoltage test method (hereinafter referred to as ITU-T k.44) of the International Telecommunication Union Telecommunication Standardization Sector for lightning surge testing of IT equipment for xDSL, It is necessary to implement IT equipment in an operating state.

  However, when performing a lightning surge test, a decoupling circuit for protecting the opposing device from an applied lightning surge overvoltage is necessary, and the ITU-T k. 44 also uses a decoupling circuit in principle.

  As prior art document information related to the invention of this application, there is Patent Document 1.

Non-patent document 1 discloses the implementation of the test in the above operating state and the principle usage of the decoupling circuit.
JP 2006-352698 A “ITU-T K.44“ Resistibility tests for telecommunication equipment exposed to overvoltages and overcurrents-Basic Recommendation ”02/2000”

  In view of the above situation, the decoupling circuit is accommodated in one housing as a decoupling circuit portion, and the coupling circuit portion and the primary protection element portion used together with the decoupling circuit portion are also accommodated in the housing. Therefore, there is a need for a coupling / decoupling device that can perform a lightning surge test on an IT device for xDSL, etc., without touching the high voltage portion as much as possible by the measurer.

  It is further preferable that this coupling / decoupling device can be used for a lightning surge test on an analog communication device.

  In a lightning surge test, it is necessary not only to ensure the safety of the human body against a high lightning surge voltage, but also to prevent a measurement device from being short-circuited and to speed up the measurement.

  For this purpose, it is preferable that the coupling circuit unit, the decoupling circuit unit, and the primary protection element unit are collectively accommodated in one casing which is an insulator.

  Conventionally, Patent Document 1 discloses a decoupling circuit capable of transmitting a high-speed digital communication signal such as xDSL in a lightning surge test. The decoupling circuit is used for testing at a maximum lightning surge test voltage of 30 kV as defined in Technical Recommendation TR189001 regarding overvoltage tolerance of communication equipment of Nippon Telegraph and Telephone Corporation established on January 31, 2003. Has been applied.

  However, since the resonance frequency of this decoupling circuit is about 50 kHz, a lightning surge test using a waveform having a wave front length of 10 us and a wave tail length of 700 us (abbreviated as “10/700 us waveform”), which is a test waveform of a communication device. In the case of implementing the above, for example, with respect to the voltage of the frequency component of 50 kHz, the voltage flowing into the opposing device can be blocked by about 30 dB (1/32), and there is a possibility that the opposing device may be adversely affected.

  In order to reduce the voltage of the frequency component of the 10/700 us waveform to 60 dB (1/1000), it is desirable to improve the resonance frequency to at least close to 200 kHz.

  If the decoupling circuit unit can realize this resonance frequency of 200 kHz, it is estimated that when the maximum lightning surge voltage of 30 kV is applied in the lightning surge test, the voltage flowing into the opposing device can be suppressed to several tens of volts. In order to achieve the target value of the resonance frequency, it is at least necessary that the coupling / decoupling device has a withstand voltage of 30 kV or more, but there are various other conditions.

  In xDSL, ADSL (Asymmetric DSL) and VDSL (Very high bit-rate DSL) are mainly used. The frequency band of ADSL is 26 kHz to 3.75 MHz, and the frequency band of VDSL is 26 kHz to 16.2 MHz. Therefore, in these frequency bands, it is necessary that the high-speed transmission signal is not attenuated as much as possible by matching the impedance between the decoupling circuit unit and the communication line. For this purpose, the decoupling circuit section is required to have a normal impedance of about 110Ω.

  Some xDSL IT devices have four communication line connection terminals, and four of them may be used, so the decoupling circuit unit needs to have at least four windings.

  On the other hand, some xDSL IT devices have two communication line connection terminals. In this case, only two of them are used, so two of the four windings of the decoupling circuit section are used. Need to be able to use.

  In the decoupling circuit of Patent Document 1, an air-core multilayer cylindrical coil is formed, and a common mode choke coil having four windings is used. In each of the four windings, the inductance value is 20 mH based on the surge immunity test standard IEC61000-4-5 in the electromagnetic compatibility of the International Electrotechnical Commission.

  The present invention has been made in view of the above, and an object of the present invention is to prevent lightning surge overvoltage applied to a device under test from being applied to a counter device that is a communication device such as an IT device not subject to testing. And it is providing the coupling / decoupling device which can raise a resonant frequency.

  In order to solve the above-described problem, a coupling / decoupling device according to claim 1 is a device under test of a lightning surge test circuit in which a device under test and a counter device are connected to an xDSL communication line using a metal subscriber line, and A coupling / decoupling device installed between opposing devices, provided between a lightning surge generator for generating a lightning surge voltage and a point of application of the lightning surge voltage to the communication line, A coupling circuit unit that applies a voltage to the application point; a decoupling circuit unit that is provided closer to the opposing device than the application point and prevents the applied lightning surge voltage from being applied to the opposing device; Provided on the device under test side from the application point, and provided between the primary protection element unit capable of attenuating the applied lightning surge voltage, and between the primary protection element unit and the device under test, The device under test A communication line connection terminal connected to the communication line in a one-to-one manner when four communication lines are connected, and the communication line when two communication lines are connected to the device under test is An input unit that is connected to two adjacent communication line connection terminals among the communication line connection terminals on a one-to-one basis, and is installed between the decoupling circuit unit and the counter device. When four communication lines are connected to the communication line, the communication line connection terminal is connected to the communication line on a one-to-one basis, and the two communication lines are connected to the opposite device, And an output unit configured to be connected to two adjacent communication line connection terminals among the communication line connection terminals on a one-to-one basis.

  The coupling / decoupling device according to claim 2 is the coupling / decoupling device according to claim 1, wherein the coupling circuit unit applies the lightning surge voltage between a communication line of the device under test and a ground. A vertical application coupling circuit unit, a horizontal application coupling circuit unit for applying the lightning surge voltage between communication lines of the device under test, one of the vertical application coupling circuit unit and the horizontal application coupling circuit unit. The vertical application coupling circuit section is selected in the initial setting.

  The coupling / decoupling device according to claim 3 is the coupling / decoupling device according to claim 1 or 2, wherein the coupling circuit section is configured to receive a positive or negative lightning surge voltage generated by the lightning surge generator. A triode gas surge arrester that is an applied lightning surge input terminal, a 0 V terminal that serves as a reference for the lightning surge voltage, and an automatic return switch function element that passes the lightning surge voltage without adversely affecting the communication signal of xDSL. The two electrodes other than the ground electrode of the triode gas surge arrester are connected to the application point, respectively, and the lightning surge voltage is applied to the ground electrode.

  The coupling / decoupling device according to claim 4 is the coupling / decoupling device according to any one of claims 1 to 3, wherein the coupling circuit unit includes a coupling circuit unit for xDSL and a coupling circuit unit for analog. And a function for selecting one of the xDSL coupling circuit section and the analog coupling circuit section, and the xDSL coupling circuit section is selected in the initial setting.

  The coupling / decoupling device according to claim 5 is the coupling / decoupling device according to any one of claims 1 to 4, wherein the decoupling circuit unit includes a plurality of air-core cylindrical coils that allow xDSL communication signals to pass therethrough. A common mode choke coil configured to be connected in series is provided.

  The coupling / decoupling device according to claim 6 is the coupling / decoupling device according to claim 5, wherein the common mode choke coil is configured by winding an electric wire coated with an insulating material in two parallel windings on a cylindrical bobbin, or four parallel windings. A cylindrical casing made of an insulating resin having an outer diameter that can be inserted without looseness in the inner diameter of the bobbin is inserted inside the plurality of cylindrical coils, and the cylindrical coil and the cylindrical casing are inserted. By having a coaxial structure with the body, the center axis of the magnetic flux generated between each cylindrical coil can be made to coincide with the plurality of cylindrical coils arranged in the axial direction. Features.

  The coupling / decoupling device according to claim 7 is the coupling / decoupling device according to any one of claims 1 to 6, wherein the primary protection element unit is a subscriber between the application point and the input unit. When carrying out a lightning surge test with a protector and disabling the primary protection element part, it has a function of selecting a route without the subscriber protector, and in the initial setting, the subscriber protector A certain route is selected.

  The coupling / decoupling device according to claim 8 is the coupling / decoupling device according to claim 7, wherein, when the primary protection element unit selects a route with the subscriber protector, the subscriber protector One end of a grounding resistor imitating a grounding resistance is connected to the grounding terminal, and the other end of the grounding resistance is connected to the grounding port of the primary protective element connected to the grounding connecting terminal of the input unit, When a route without a subscriber protector is selected, the ground resistor is not connected, and the subscriber protector has a function of establishing a state of being insulated from the ground.

  The coupling / decoupling device according to claim 9 is the coupling / decoupling device according to any one of claims 1 to 8, wherein the input unit includes four communication lines for connecting communication lines of the device under test. A connection terminal; an earth connection terminal for connecting an earth port of the device under test; and an earth terminal for holding the coupling / decoupling device at a zero potential. The earth terminal, the earth connection terminal, and the primary The earth port of the protection element section and the 0V terminal of the coupling circuit section are connected, and the device under test corresponds to communication between the opposite device by connecting two communication lines. In this case, only two communication line connection terminals among the four communication line connection terminals can be used.

  The coupling / decoupling device according to claim 10 is the coupling / decoupling device according to any one of claims 1 to 9, wherein the output unit connects four communication lines for connecting the communication lines of the opposing device. A terminal, and the opposite device connects two communication lines to communicate with the device under test, two communication among the four communication line connection terminals The present invention is characterized in that only the line connection terminal can be used.

  The coupling / decoupling device according to claim 11 is the coupling / decoupling device according to any one of claims 1 to 10, wherein the input unit, the coupling circuit unit, and the primary protection element unit are coupled / decoupled. It is provided on one of the four side surfaces of the housing of the coupling device, and the output unit is provided on a side surface facing the one side surface.

  According to the first aspect of the present invention, in a lightning surge test for an xDSL IT device or the like, the coupling circuit portion to which a high voltage is applied, the decoupling circuit portion, and the primary protection element portion are accommodated in one casing. This makes it possible to perform the test safely and promptly because the measurer does not touch the high voltage portion as much as possible. This device can also be applied to lightning surge tests of conventional analog communication equipment. By having a common mode choke coil in which a plurality of split air core coils for passing xDSL communication signals are connected in series, the capacitance generated between the windings of the air core coil is suppressed as much as possible, Performance to prevent the lightning surge overvoltage applied to the device under test from flowing into the opposite device that is not the subject of the test compared to the conventional common mode choke coil due to the effect of improving the resonance frequency. It is possible to improve the lightning surge test in the operating state of communication equipment such as IT equipment.

  According to the second aspect of the present invention, the coupling circuit section is provided with a longitudinal application and a lateral application, and either one can be selected by using the switching function, so that the wiring can be removed at each test. This saves testing time because it can save time and effort. Further, since the high voltage portion is not touched, the safety of the worker is improved.

  According to the third aspect of the present invention, even when a lightning surge voltage is applied to the device under test when the communication device is in the communication state between the device under test and the opposite device and there are two communication lines, Since the capacitance between the electrodes of a certain triode gas arrester is as small as 1 to 2 pF, there is almost no adverse effect such as attenuation on the communication signal of xDSL. In addition, although a coupling circuit unit can be configured by using a bipolar gas surge arrester, not only two are required, but also there is a difference in the discharge start time between the two bipolar gas surge arresters. As a result, a lateral voltage is generated between the two communication lines, which may adversely affect the device under test. For this reason, it is advantageous to use a triode gas surge arrester for the coupling circuit portion.

  According to the fourth aspect of the present invention, the analog coupling circuit unit different from that for xDSL is provided so as to be applicable to a lightning surge test of a conventional low-speed analog communication device. The analog coupling circuit unit employs a circuit configuration described in IEC61000-4-5. For this reason, since this coupling / decoupling device has two types of coupling circuit units, it is more economically advantageous than using a device in which xDSL and analog coupling circuit units are separately mounted.

  According to the fifth aspect of the present invention, since it is a common mode choke coil that operates by connecting a plurality of divided air-core cylindrical coils that allow communication of xDSL communication signals in series, the capacitance between the windings is reduced. Thus, the resonance frequency of the common mode choke coil can be improved.

  According to the sixth aspect of the present invention, there is no backlash with respect to the inner diameter of a plurality of cylindrical coils formed by winding a winding wire coated with a high insulation material on a cylindrical bobbin in two parallel windings or four parallel windings. By having a structure for inserting a cylindrical casing having an overall length exceeding the total length of all of a plurality of cylindrical coils made of an insulating resin having an outer diameter that can be inserted, A coaxial structure is configured between the plurality of cylindrical coils and the cylindrical casing. With this coaxial structure, the central axis of the magnetic flux generated between each cylindrical coil can be uniquely matched in a state where a plurality of cylindrical coils are arranged in the axial direction.

  According to the invention described in claim 7, for example, by using a predetermined subscriber protector used for a metal subscriber line of Nippon Telegraph and Telephone Corporation as a primary protection element part of a device under test, A lightning surge test can be performed considering the environment in which the subscriber protector is used. In addition, when conducting a lightning surge test that does not use the primary protective element, it is possible to switch to a route without a subscriber protector, so that it is not necessary to remove or attach the subscriber protector at each test. Since it can be omitted, the test time can be saved and the high voltage portion can be prevented from being touched, so that the safety of workers can be improved.

  According to the eighth aspect of the present invention, when the presence of the primary protection element portion is selected, an arbitrary resistance value simulating the ground resistance, for example, 300Ω, is formed between the grounds at the ground terminal of the subscriber protector. The lightning surge test can be performed quickly. When no primary protection element portion is selected, the subscriber protector can be disconnected from the communication line, so that the lightning surge test can be performed with a single coupling / decoupling device.

  According to the ninth aspect of the invention, the procedure for installing the device under test having four communication lines in the coupling / decoupling device is that the four communication lines are connected to the four communication line connection terminals of the input unit. The line can be set by connecting the ground port of the device under test to the ground connection terminal of the input unit, and connecting the ground terminal of the input unit to the ground of the test room. In the case of a device under test having two communication lines, line setting can be performed by connecting the communication lines to predetermined two communication line connection terminals among the four communication line connection terminals of the input unit.

  According to the tenth aspect of the present invention, the procedure for installing the opposing device having four communication lines in the coupling / decoupling device is to connect the four communication lines to the four communication line connection terminals of the output unit. You can set up the line just by doing. In the case of an opposing apparatus having two communication lines, the line can be set by connecting the communication line to two predetermined communication line connection terminals among the four communication line connection terminals of the output unit.

  According to the eleventh aspect of the present invention, the input portion of the coupling / decoupling device is installed on one side surface of the four in the housing height direction, and the output portion is placed on the surface of the housing facing the input portion. By installing and configuring, the separation distance between the device under test and the opposing device can be increased, so that electromagnetic interference given to the xDSL communication signal between both devices can be suppressed as much as possible. In addition, by installing the input unit, the coupling circuit unit, and the primary protection element unit on the same side, it is possible to improve operability, convenience, and safety in conducting the lightning surge test.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a circuit diagram showing a lightning surge test circuit to which a coupling / decoupling device according to an embodiment of the present invention is applied. The coupling / decoupling device 100 shown in FIG. 1 shows an example applied to a lightning surge test circuit of an IT device for xDSL, which is a high-speed digital transmission method using a metal subscriber line, and the number of communication lines. Is four.

  The coupling / decoupling device 100 is similar to the device under test 300, the input unit 1 connected to the device under test 300, which is an IT device for xDSL, the coupling circuit unit 2 connected to the lightning surge generator 400, and the like. A decoupling circuit unit 3 that protects the opposing device 200 that is an IT device for xDSL, a primary protection element unit 4 that protects the device under test 300, and an output unit 5 that is connected to the opposing device 200 are provided in the housing 101. Is housed in.

FIG. 2 is a perspective view in which a part of the coupling / decoupling device 100 is cut away.
The outer dimensions of the coupling / decoupling device 100 are 105 cm wide × 105 cm deep × 175 cm high. The housing 101 is composed of a frame material and four side plates of a bakelite plate, a ceiling plate, and a bottom plate, and also includes communication line connection terminals 11 to 14, a ground connection terminal 19, a 0V terminal 20, a lightning surge input terminal 21, The primary protective element section 4 and the communication line connection terminals 51 to 54 (not shown, but provided so as to face the communication line connection terminals 55 to 58 shown in the figure) and the earth connection terminal 50 are respectively protective covers made of acrylic plates (not shown). The connecting wire is drawn out from the lower part of the protective lid. Each of the protective lids is attached to the side surfaces 1011 and 1012 with hinges at one end of the upper surface, and each of the protective lids is configured to open the protective lid upward when connecting a wire to a predetermined connection terminal. ing.

  The input unit 1, the coupling circuit unit 2, and the primary protection element unit 4 are provided on the side surface 1011 of the housing 101, and the output unit 5 is provided on the side surface 1012 facing the side surface 1011. The decoupling circuit unit 3 is accommodated in the housing 101.

  In the input unit 1, the communication line connection terminals 11 to 14 and the ground connection terminal 19 are accommodated in the protective cover, and the ground terminal 10 is exposed to the outside. The communication line connection terminals 11 and 12 used in the set are arranged adjacent to each other. The communication line connection terminals 13 and 14 used in the set are arranged adjacent to each other.

  In the output unit 5, the communication line connection terminals 55 to 58 are exposed to the inside, and the communication line connection terminals 55 to 58 are connected to the decoupling circuit unit 3 via the communication line. Further, the communication line connection terminals 51 to 54 and the ground connection terminal 50 are accommodated in the protective cover.

  In the coupling circuit unit 2, the 0V terminal 20 and the lightning surge input terminal 21 are accommodated in the protective cover. The lightning surge input terminal 21 is a terminal having high dielectric strength.

  In the coupling / decoupling device 100, a high voltage is handled, but the circuit other than the ground terminal 10 exposed to the outside is included in the casing 101 and the protective lid, so that the measurer is placed in the high voltage portion. Touching can be avoided as much as possible, and therefore the test can be performed safely and quickly.

  Further, since the input unit 1 is provided on the side surface 1011 and the output unit 5 is provided on the opposite side surface 1012, the distance between the device under test 300 and the opposing device 200 can be increased. Therefore, electromagnetic interference given to the device under test 300 and the counter device 200 can be suppressed as much as possible.

  Returning to FIG. 1, the coupling circuit unit 2 includes switches 201 to 206, analog coupling circuit units 207 and 208, triode gas surge arresters 209 to 212, 0 V terminal 20, lightning surge input terminal 21, and output terminals 23 to 26. Prepare.

  The triode gas arrester 209 to 212 is used by being an automatic return switch function element that allows a lightning surge voltage to pass through without adversely affecting the xDSL communication signal. As the triode gas surge arresters 209 to 212, those having an interelectrode capacitance of 1 to 2 pF are used. As described above, the 0V terminal 20 and the lightning surge input terminal 21 are accommodated in the protective cover and are not exposed to the outside of the housing 101.

  The triode gas surge arresters 209 and 211 constitute a so-called vertical application coupling circuit portion, and the triode gas surge arresters 209 to 212 constitute a so-called lateral application coupling circuit portion.

  The tripolar gas surge arresters 209 to 212 and the switches 202 and 204 constitute an xDSL coupling circuit unit, and the analog coupling circuit units 207 and 208 constitute an analog coupling circuit unit.

  The analog coupling circuit units 207 and 208 are provided so that a lightning surge test can be performed on a low-speed analog communication device, and is shown in the IEC61000-4-5 surge immunity test standard for electromagnetic compatibility of the International Electrotechnical Commission. It consists of a parallel connection of a bipolar gas arrester and capacitor. This bipolar gas arrester is used because it is an automatic return switch functional element.

  The 0V terminal 20 and the lightning surge input terminal 21 are connected to the ground port 4002 and the high voltage port 4001 of the lightning surge generator 400, respectively.

  The lightning surge input terminal 21 is connected to the terminal 2011 of the switch 201. The lightning surge input terminal 21 is connected to the terminal 2031 of the switch 203 via the switch 205. Each terminal of the switch 205 is normally floating.

A terminal 2012 of the switch 201 is connected to the ground electrode of the triode gas arrester 209.
One communication line electrode of the triode gas arrester 209 is connected to the output terminal 23.

  A terminal 2013 of the switch 201 is connected to an input terminal of the analog coupling circuit unit 207. The two output terminals of the analog coupling circuit unit 207 are connected to the output terminals 23 and 24, respectively.

  The 0V terminal 20 is connected to the ground electrode of the triode gas arrester 210. The 0V terminal 20 is connected to the ground electrode of the triode gas arrester 212 via the switch 206. Each terminal of the switch 206 is normally floating.

One communication line electrode of the triode gas surge arrester 210 is connected to a terminal 2021 of the switch 202. The other communication line electrode of the triode gas arrester 210 is made floating.
The other communication line electrode of the triode gas arrester 209 is connected to the terminal 2022 of the switch 202.

A terminal 2023 of the switch 202 is connected to the output terminal 24.
In the switch 201, the terminals 2011 and 2012 are connected, and the terminal 2013 is in a floating state.
In the switch 202, the terminals 2022 and 2023 are connected, and the terminal 2021 is in a floating state.
A terminal 2032 of the switch 203 is connected to the ground electrode of the triode gas arrester 211. One communication line electrode of the triode gas arrester 211 is connected to the output terminal 26.
A terminal 2033 of the switch 203 is connected to an input terminal of the analog coupling circuit unit 208.

The two output terminals of the analog coupling circuit unit 208 are connected to the output terminals 25 and 26, respectively.
One communication line electrode of the triode gas arrester 212 is connected to the terminal 2041 of the switch 204. The other communication line electrode of the triode gas arrester 212 is set in a floating state.
The other communication line electrode of the triode gas arrester 211 is connected to the terminal 2042 of the switch 204.
A terminal 2043 of the switch 204 is connected to the output terminal 25.
In the switch 203, the terminals 2031 and 2032 are connected, and the terminal 2033 is in a floating state.
In the switch 204, the terminals 2042 and 2043 are connected, and the terminal 2041 is in a floating state.

  In the coupling circuit unit 2, a bipolar gas arrester may be used instead of the triode gas arrester. However, in this case, two bipolar gas arresters are required for one triode gas arrester. In addition, a difference occurs in the discharge start time between the two bipolar gas arresters, and a lateral voltage is generated between the communication lines to which the bipolar gas arrester is connected. There is a risk of adverse effects. Therefore, it is preferable to use a triode gas surge arrester for the coupling circuit unit 2.

  Further, in the coupling circuit unit 2, not only the circuit for xDSL, that is, the switches 202 and 204, the triode gas surge arresters 209 to 212, but also the circuit for analog, that is, the coupling circuit units 207 and 208 for analog, and xDSL Switch 201 and 203 for switching between a circuit for analog and a circuit for analog, a coupling / decoupling device including a coupling circuit unit including only a circuit for xDSL and a coupling circuit unit including only a circuit for analog are included. It is more economical than using a coupling / decoupling device.

  The input unit 1 includes communication line connection terminals 11 to 18, ground connection terminals 19 and 1 </ b> A, and a ground terminal 10. As described above, the communication line connection terminals 11 to 14 and the ground connection terminal 19 are accommodated in the protective cover, and the ground terminal 10 is exposed to the outside of the housing 101.

  The communication line connection terminals 11 to 14 are connected to the communication line connection terminals 3001 to 3004 of the device under test 300 via the communication line (balanced line) 3100, respectively.

  Although not shown, when the apparatus under test 300 does not include the communication line connection terminals 3003 and 3004, the communication line connection terminals 11 and 12 are connected to the communication line connection terminals 3001 and 3002 via two communication lines (balanced lines). Connected to each.

  The ground connection terminal 19 is connected to the ground port 3005 of the device under test 300 via a ground wire.

  Communication line connection terminals 11 and 15, 12 and 16, 13 and 17, 14 and 18, and ground connection terminals 19 and 1A are respectively connected.

  The output unit 5 includes communication line connection terminals 51 to 58 and a ground connection terminal 50. The communication line connection terminals 51 to 54 and the ground connection terminal 50 are accommodated in the protective cover. The communication line connection terminals 51 and 52 used in the set are arranged adjacent to each other. Further, the communication line connection terminals 53 and 54 used in the set are arranged adjacent to each other.

  The communication line connection terminals 51 to 54 are connected to the communication line connection terminals 2001 to 2004 of the opposite apparatus 200 via the communication line (balanced line) 2100, respectively.

  The ground port 2005 of the opposing device 200 is made floating.

  Although not shown, when the opposite apparatus 200 does not include the communication line connection terminals 2003 and 2004, the communication line connection terminals 51 and 52 are connected to the communication line connection terminals 2001 and 2002 via two communication lines (balanced lines). Each is connected.

  Communication line connection terminals 51 and 55, 52 and 56, 53 and 57, and 54 and 58 are connected, respectively.

  The primary protection element unit 4 includes subscriber protectors 401 and 402, switches 403 to 408, ground resistors 409 and 410, a ground port 40, and communication line connection terminals 41 to 48. As the subscriber protectors 401 and 402, those installed in the user's home can be used. As the subscriber protectors 401 and 402, for example, a predetermined one used for a metal subscriber line of Nippon Telegraph and Telephone Corporation can be used. The grounding resistors 409 and 410 imitate such an earth resistance in an actual subscriber protector, and for example, the value thereof is 300Ω. In this way, a lightning surge test according to the actual communication environment can be performed by using a subscriber protector that is actually used or a model that simulates an actual ground resistance. In that case, the lightning surge voltage can be attenuated to a predetermined voltage.

  The communication line connection terminal 41 is connected to one terminal for one communication line of the subscriber protector 401. The communication line connection terminal 45 is connected to the other terminal for one communication line of the subscriber protector 401. The communication line connection terminals 41 and 45 are connected to each other via the switch 403.

  The communication line connection terminal 42 is connected to one terminal for the other communication line of the subscriber protector 401. The communication line connection terminal 46 is connected to the other terminal for the other communication line of the subscriber protector 401. The communication line connection terminals 42 and 46 are connected to each other via the switch 404.

  The communication line connection terminal 43 is connected to one terminal for one communication line of the subscriber protector 402. The communication line connection terminal 47 is connected to the other terminal for one communication line of the subscriber protector 402. The communication line connection terminals 43 and 47 are connected to each other via the switch 405.

  The communication line connection terminal 44 is connected to one terminal for the other communication line of the subscriber protector 402. The communication line connection terminal 48 is connected to the other terminal for the other communication line of the subscriber protector 402. The communication line connection terminals 44 and 48 are connected to each other via the switch 406.

  A ground terminal (not shown) of the subscriber protector 401 is connected to the ground port 40 via a ground resistor 409 and a switch 407.

  A ground terminal (not shown) of the subscriber protector 402 is connected to the ground port 40 via a ground resistor 410 and a switch 408.

In the switches 403 to 406, each terminal is in a floating state.
In each of the switches 407 and 408, each terminal is connected.

  The decoupling circuit unit 3 includes a common mode choke coil 310 and wire connection terminals 31 to 38.

One end of the winding 301 of the common mode choke coil 310 is connected to the wire connection terminal 31, and the other end of the winding 301 is connected to the wire connection terminal 35.
One end of the winding 302 of the common mode choke coil 310 is connected to the wire connection terminal 32, and the other end of the winding 302 is connected to the wire connection terminal 36.
One end of the winding 303 of the common mode choke coil 310 is connected to the wire connection terminal 33, and the other end of the winding 303 is connected to the wire connection terminal 37.
One end of the winding 304 of the common mode choke coil 310 is connected to the wire connection terminal 34, and the other end of the winding 304 is connected to the wire connection terminal 38.

  The communication line connection terminals 15 to 18 of the input unit 1 are connected to the communication line connection terminals 41 to 44 of the primary protective element unit 4 via four communication lines (balanced lines) 49, respectively.

  Communication line connection terminals 55 to 58 of the output unit 5 are connected to one ends of the resistors 61 to 64 via four communication lines (balanced lines) 59. The other ends of the resistors 61 to 64 are connected to the wire connection terminals 31 to 34 of the decoupling circuit unit 3, respectively. Switches 65 to 68 are connected to the resistors 61 to 64, respectively. Each terminal is connected in the switches 65-68.

  The wire connection terminals 35 to 38 of the decoupling circuit unit 3 are connected to the communication line connection terminals 45 to 48 of the primary protective element unit 4 through four communication lines (balanced lines) 39, respectively.

  A lightning surge application point T1 is set for the communication line connecting the wire connection terminal 35 and the communication line connection terminal 45, and a lightning surge application point T2 is set for the communication line connecting the wire connection terminal 36 and the communication line connection terminal 46. Is set. The output terminals 24 and 23 of the coupling circuit unit 2 are connected to lightning surge application points T1 and T2 via unbalanced lines 27, respectively.

  A lightning surge application point T3 is set for the communication line connecting the wire connection terminal 37 and the communication line connection terminal 47, and a lightning surge application point T4 is set for the communication line connecting the wire connection terminal 38 and the communication line connection terminal 48. Is set. The output terminals 25 and 26 of the coupling circuit unit 2 are connected to lightning surge application points T3 and T4 via unbalanced lines 28, respectively.

  The ground connection terminal 1A, the ground terminal 10, the ground connection terminal 19, the 0V terminal 20 of the coupling circuit unit 2, the ground port 40 of the primary protective element unit 4, and the ground connection terminal 50 of the output unit 5 are connected to each other. The

  The ground terminal 10 of the input unit 1 is connected to a ground G installed outside the coupling / decoupling device 100 and is held at zero potential.

  FIG. 3 is a circuit diagram of the common mode choke coil 310. FIG. 4 is a side view in which one portion of the common mode choke coil 310 is cut away.

  The decoupling circuit unit 3 includes a common mode choke coil 310 and wire connection terminals 31 to 38.

  The common mode choke coil 310 includes windings 301 to 304, a cylindrical casing 305, and bobbins 306 to 309. The cylindrical housing 305 is a cylindrical housing made of an insulating resin, for example, made of vinyl chloride. Each of the bobbins 306 to 309 has, for example, a flange-shaped stopper made of an acrylic disc at both ends in the longitudinal direction of a cylinder made of vinyl chloride pipe.

In one embodiment of the common mode choke coil 310, the windings 301 to 304 are coated with an insulating material having high insulating properties, for example, a 7.5 kV polyethylene insulated vinyl sheathed electric wire. 5.4 mm and ² mm ² respectively. In this embodiment, the insulation performance and the economy are considered in this way. In this embodiment, the normal impedance of the common mode choke coil 310 is about 110Ω. Therefore, in the frequency bands of ADSL and VDSL, impedance matching between the decoupling circuit unit 3 and the communication line can be performed so that the high-speed transmission signal is not attenuated as much as possible.

  In the embodiment, each of the bobbins 306 to 309 has a length of 198 mm, an outer diameter of 410 mm, an inner diameter of 370 mm, and a flange outer diameter of 640 mm.

  In this embodiment, the cylindrical housing 305 has a length of 1180 mm, an outer diameter of 370 mm, and an inner diameter of 347 mm.

  The bobbins 306 to 309 have the same inner diameter, and the outer diameter of the cylindrical housing 305 is slightly smaller than the inner diameter. In the bobbins 306 to 309, a gap 380 is provided between adjacent bobbins. And the cylindrical housing | casing 305 is inserted inside the bobbins 306-309 without backlash.

  The common mode choke coil 310 has an air core structure in this way. That is, the common mode choke coil 310 is prevented from being magnetically saturated even by such a lightning surge voltage as an air-core structure so that a lightning surge test can be performed with a lightning surge voltage of several hundred V to 30 kV or more.

  The axial length of the cylindrical housing 305 includes the total length of the bobbins 306 to 309, the total length of the gap 380, the length of the portion 3051 to which the wire connection terminals 31 to 34 are attached, and the wire connection terminals. 35-38 is the sum total of the length of the part 3052 to which it is attached.

  The portions of the windings 301 to 304 that are closest to the wire connection terminals 35 to 38 are wound in multiple layers in parallel on the bobbin 306, thus forming the split coil 3061 that is an air-core cylindrical coil.

  The portion next to the wire connection terminals 35 to 38 next to the windings 301 to 304 is wound in multiple layers on the bobbin 307 in parallel, and thus a split coil 3071 which is an air-core cylindrical coil is configured.

  The portion next to the wire connection terminals 35 to 38 next to the windings 301 to 304 is wound in parallel on the bobbin 308 in multiple layers, thus forming the split coil 3081 that is an air-core cylindrical coil.

  The portions of the windings 301 to 304 that are farthest from the wire connection terminals 35 to 38 are wound in multiple layers on the bobbin 309 in parallel to form a split coil 3091 that is an air-core cylindrical coil.

  The winding start of the windings 301 to 304 in the split coil 3061 is connected to the wire connection terminals 35 to 38, respectively.

  Ends of windings 301 to 304 in divided coil 3061 are connected to the beginnings of windings 301 to 304 in divided coil 3071, respectively.

  Ends of windings 301 to 304 in divided coil 3071 are connected to the beginnings of windings 301 to 304 in divided coil 3081, respectively.

  Ends of windings 301 to 304 in divided coil 3081 are connected to the beginnings of windings 301 to 304 in divided coil 3091, respectively.

  The winding ends of the windings 301 to 304 in the split coil 3091 are connected to the wire connection terminals 31 to 34, respectively.

  In FIG. 3, a black circle mark is attached at the beginning of winding, and a black circle mark is not added at the end of winding.

  In xDSL, ADSL (Asymmetric DSL) and VDSL (Very high bit-rate DSL) are mainly used. The frequency band of ADSL is 26 kHz to 3.75 MHz, and the frequency band of VDSL is 26 kHz to 16.2 MHz.

  In one embodiment of the common mode choke coil 310, signals are allowed to pass in these frequency bands, and signals are allowed to pass even in the frequency band of audio signals.

  In the embodiment, in each of the divided coils 3061 to 3091, the number of turns of each of the windings 301 to 304 is 90 turns (= 6 turns × 15 layers), and the inductance value thereof is 5 mH. Since the divided coils 3061 to 3091 are connected in series, the inductance values of the windings 301 to 304 are 20 mH (= 5 mH × 4 (divided coils 3061 to 601) shown in the surge immunity test standard IEC61000-4-5. 3091))).

  FIG. 5 is a diagram showing an example of common mode impedance characteristics in the common mode choke coil 310. The resonance frequency of the common mode choke coil 310 is 155.03 kHz. The inductance value obtained from the impedance value at that time is 20.8 mH.

  In addition, by making the length of the bobbins 306 to 309 longer, it is possible to reduce the number of layers of the windings and reduce the capacitance between the wires, and thereby to increase the resonance frequency.

  In this embodiment, the common mode choke coil 310, the wire connection terminals 31 to 38, and the cylindrical housing 305 are provided with a dielectric strength of 50 kV or more so as not to break down even by a lightning surge voltage of 30 kV or more.

  Since the cylindrical housing 305 is inserted inside the bobbins 306 to 309, the central axes of the divided coils 3061 to 3091 coincide with each other, and a coaxial structure is configured between each divided coil and the cylindrical housing 305. Moreover, the central axes of the magnetic fluxes in the axial direction generated by the split coils 3061 to 3091 coincide with each other, and the inductance of the common mode choke coil 310 can be generated efficiently.

  Further, since the center axes of the split coils 3061 to 3091 and the cylindrical housing 305 coincide with each other, the axial length of the gap 380 can be easily adjusted, and the common mode choke coil 310 can be easily adjusted to maximize the inductance. It can be done.

(1) Test Method for Device Under Test 300 including Two Communication Line Connection Terminals A test method when the device under test 300 includes two communication line connection terminals will be described.

(1-1) First, a test method when a lightning surge voltage is applied between the communication line connection terminals 3001 and 3002 and the earth port 3005 will be described. Such application is referred to as “longitudinal application”.

The ground terminal 10 of the input unit 1 is connected to the ground G.
The communication line connection terminals 11 and 12 of the input unit 1 are connected to the communication line connection terminals 3001 and 3002 of the device under test 300 via communication lines, respectively.

The ground connection terminal 19 of the input unit 1 is connected to the ground port 3005 of the device under test 300.
The communication line connection terminals 51 and 52 of the output unit 5 are connected to the communication line connection terminals 2001 and 2002 of the opposite apparatus 200 via communication lines, respectively.

The ground port 2005 of the opposing device 200 is made floating.
The 0V terminal 20 and the lightning surge input terminal 21 of the coupling circuit unit 2 are connected to the ground port 4002 and the high voltage port 4001 of the lightning surge generator 400, respectively.

  In this embodiment, the input unit 1, the coupling circuit unit 2, and the output unit 5 are operated, not limited to the test in this case. As shown in FIG. 2, since the input unit 1, the coupling circuit unit 2, and the primary protection element unit 4 that are such operation targets are provided on the same side surface 1011, operability is improved. In addition, this improvement in convenience leads to an improvement in safety.

In the switch 201, the terminals 2011 and 2012 are connected, and the terminal 2013 is floated. That is, the initial setting is maintained.
In the switch 202, the terminals 2022 and 2023 are connected, and the terminal 2021 is put in a floating state. That is, the initial setting is maintained.
In each of the switches 205 and 206, each terminal is made floating. That is, the initial setting is maintained.
When the primary protection element unit 4 is disabled, the terminals are connected by the switches 403 and 404, respectively. That is, the initial setting is changed. In the switch 407, each terminal is floated. That is, the initial setting is changed.

  On the other hand, when the primary protective element unit 4 is made effective, the terminals are floated by the switches 403 and 404, respectively. That is, the initial setting is maintained. In the switch 407, each terminal is connected. That is, the initial setting is maintained.

  In addition, each of the switches 65 and 66 is connected to each terminal. That is, the initial setting is maintained.

  Next, the device under test 300 and the opposite device 200 communicate with each other. The configuration of the common mode choke coil 310 described with reference to FIGS. 3 and 4 blocks the communication signal of 26 kHz to 3.75 MHz in the case of ADSL and the communication signal of 26 kHz to 16.2 MHz in the case of VDSL. Can communicate.

  Further, this communication signal passes through the lightning surge application points T1 and T2, and the triode gas arrester 209 is connected to these lightning surge application points T1 and T2. Since it is as small as 1 to 2 pF, adverse effects such as attenuation of the communication signal here can be almost eliminated. In addition, since the interelectrode capacitance of the triode gas arrester 210 to 212 is very small as 1 to 2 pF, not limited to the triode gas arrester 209, the communication of xDSL communication signals to be described hereinafter is also the communication. Adverse effects such as signal attenuation can be almost eliminated.

  Next, a positive or negative lightning surge voltage is generated at the high voltage port 4001 with respect to the ground port 4002 of the lightning surge generator 400.

  This lightning surge voltage is applied to the lightning surge application point T1 via the switch 201, the triode gas arrester 209, the switch 202, and the output terminal 24.

  The lightning surge voltage is applied to the lightning surge application point T2 via the switch 201, the triode gas arrester 209, and the output terminal 23.

  When the primary protection element unit 4 is disabled, the lightning surge voltage applied to the lightning surge application points T1 and T2 is not attenuated by the primary protection element unit 4, and the lightning surge voltage applied to the lightning surge application point T1 is The lightning surge voltage applied between the communication line connection terminal 3001 of the device under test 300 and the earth port 3005 and applied to the lightning surge application point T2 is between the communication line connection terminal 3002 of the device under test 300 and the earth port 3005. Applied.

  When the primary protection element unit 4 is activated, the lightning surge voltage applied to the lightning surge application points T1 and T2 is attenuated by the operation of the subscriber protector 401 of the primary protection element unit 4.

  The operating current output from the ground terminal of the subscriber protector 401 returns to the earth port 4002 of the lightning surge generator 400 via the ground resistor 409 and the 0V terminal 20. Since the earth port 40 is connected to the earth G through the earth terminal 10 of the input unit 1, it is held at zero potential. However, the ground terminal of the subscriber protector 401 is the product of the residual voltage after operation of the subscriber protector 401 (which is several tens of volts), the resistance value of the ground resistor 409, and the operating current of the subscriber protector 401. The potential is higher than the zero potential by a voltage obtained by adding the expressed voltage (referred to as ground resistance voltage). However, since the residual voltage is very small compared to the ground resistance voltage, it can be ignored. That is, when the primary protection element unit 4 is enabled, there is no problem considering that the voltage after the lightning surge voltage is attenuated is equal to the ground resistance voltage.

  When the primary protective element unit 4 is enabled, the potential of the grounding terminal of the subscriber protector 401 and the subscriber protector 402 is increased by the ground resistance voltage from the zero potential in the same manner in the subsequent tests. Yes.

  The lightning surge voltage applied to the lightning surge application point T1 or the voltage after attenuation thereof is applied between the communication line connection terminal 3001 of the device under test 300 and the earth port 3005, and the lightning surge applied to the lightning surge application point T2. The voltage or the voltage after the attenuation is applied between the communication line connection terminal 3002 of the device under test 300 and the earth port 3005.

  On the other hand, the lightning surge voltage applied to the lightning surge application points T 1 and T 2 is attenuated by the decoupling circuit unit 3. Therefore, it is possible to prevent the lightning surge voltage applied to the lightning surge application points T1 and T2 from being applied to the opposing device 200 without being attenuated. Therefore, the lightning surge test can be performed with high accuracy while the opposing device 200 is operated.

(1-2) Next, a test method when a lightning surge voltage is applied between the communication line connection terminal 3001 and the communication line connection terminal 3002 will be described. Such application is referred to as “lateral application”.

The ground terminal 10 of the input unit 1 is connected to the ground G.
The connection between the facing device 200, the device under test 300, the lightning surge generator 400 and the coupling / decoupling device 100 is the same as the connection in (1-1). The setting of the switch in the coupling / decoupling device 100 differs from the setting in (1-1) in the following points.

  In the switch 202, the terminals 2021 and 2023 are connected, and the terminal 2022 is floated. That is, the initial setting is changed.

  Thus, since the switch 202 is provided and the vertical application and the horizontal application are switched by changing the setting, the switching can be performed without removing or attaching the wiring. Therefore, the trouble of attaching / detaching the wiring can be saved. In addition, safety is improved because an operator does not touch the high voltage portion when the wiring is removed.

  In addition, each of the switches 65 and 66 causes each terminal to float. That is, the initial setting is changed.

  In addition, similarly to (1-1), the device under test 300 and the opposite device 200 communicate with each other.

  Next, a positive or negative lightning surge voltage is generated at the high voltage port 4001 with respect to the ground port 4002 of the lightning surge generator 400.

  This lightning surge voltage is applied to the lightning surge application point T2 via the switch 201, the triode gas arrester 209, and the output terminal 23.

  When the primary protection element unit 4 is disabled, the lightning surge voltage applied to the lightning surge application point T2 is not attenuated by the primary protection element unit 4 and is applied to the communication line connection terminal 3002 of the device under test 300.

  When the primary protective element unit 4 is enabled, the lightning surge voltage applied to the lightning surge application point T2 is attenuated by the primary protective element unit 4 and applied to the communication line connection terminal 3002 of the device under test 300.

  In addition, the earth port 4002 of the lightning surge generator 400, the triode gas arrester 210 of the coupling circuit unit 2, the switch 202, the output terminal 24, the lightning surge application point T1, and the communication line connection terminals 45 and 41 of the primary protection element unit 4 A path connecting the communication line connections 15 and 11 of the input unit 1 and the communication line connection terminal 3001 is formed. Through this path, the lightning surge voltage or the attenuated voltage is applied between the communication line connection terminal 3001 and the communication line connection terminal 3002.

  On the other hand, high voltage port 4001, switch 201, triode gas arrester 209, output terminal 23, lightning surge application point T2, winding 302, resistor 62, communication line connection terminal 2002, internal circuit of counter device 200, communication line connection A path connecting the terminal 2001, the resistor 61, the winding 301, the lightning surge application point T1, the output terminal 24, the switch 202, the triode gas arrester 210, and the earth port 4002 of the lightning surge generator 400 is formed. The lightning surge voltage is attenuated by the resistors 61 and 62. Therefore, it is possible to prevent the lightning surge voltage from being applied to the opposing device 200 without being attenuated. Therefore, the lightning surge test can be performed with high accuracy while the opposing device 200 is operated.

(2) Method for testing an analog device under test having two communication line connection terminals Next, a method for testing an analog device under test (not shown) having two communication line connection terminals will be described.

(2-1) First, a test method for applying a lightning surge voltage between two communication line connection terminals (referred to as communication line connection terminals A1 and A2) and an earth port (referred to as an earth port AG) of the device under test Will be explained. Such application is referred to as “longitudinal application”.

The ground terminal 10 of the input unit 1 is connected to the ground G.
The communication line connection terminals 11 and 12 of the input unit 1 are connected to the communication line connection terminals A1 and A2 via the communication lines, respectively.

The ground connection terminal 19 of the input unit 1 is connected to the ground port AG.
The communication line connection terminals 51 and 52 of the output unit 5 are respectively connected to two communication line connection terminals (referred to as communication line connection terminals B1 and B2) of the analog counter device via the communication line.

The ground port (referred to as the ground port BG) of the opposing device 200 is made floating.
The 0V terminal 20 and the lightning surge input terminal 21 of the coupling circuit unit 2 are connected to the ground port 4002 and the high voltage port 4001 of the lightning surge generator 400, respectively.

In the switch 201, the terminals 2011 and 2013 are connected, and the terminal 2012 is floated. That is, the initial setting is changed.
In the switch 205, each terminal is brought into a floating state. That is, the initial setting is maintained.

  When the primary protection element unit 4 is disabled, the terminals are connected by the switches 403 and 404, respectively. That is, the initial setting is changed. In the switch 407, each terminal is floated. That is, the initial setting is changed.

  On the other hand, when the primary protective element unit 4 is made effective, the terminals are floated by the switches 403 and 404, respectively. That is, the initial setting is maintained. In the switch 407, each terminal is connected. That is, the initial setting is maintained.

  In addition, each of the switches 65 and 66 is connected to each terminal. That is, the initial setting is maintained.

Next, the analog device under test and the opposite device communicate with each other.
Next, a positive or negative lightning surge voltage is generated at the high voltage port 4001 with respect to the ground port 4002 of the lightning surge generator 400.

  The lightning surge voltage is applied to the lightning surge application points T1 and T2 via the switch 201, the analog coupling circuit unit 207, and the output terminals 23 and 24.

  When the primary protection element unit 4 is disabled, the lightning surge voltage applied to the lightning surge application point T1 is not attenuated by the primary protection element unit 4 and is applied between the communication line connection terminal A1 and the earth port AG. . In addition, the lightning surge voltage applied to the lightning surge application point T2 is not attenuated by the primary protective element unit 4, but is applied between the communication line connection terminal A2 and the earth port AG.

  When the primary protection element unit 4 is enabled, the lightning surge voltage applied to the lightning surge application point T1 is attenuated by the primary protection element unit 4 and applied between the communication line connection terminal A1 and the earth port AG. . Further, the lightning surge voltage applied to the lightning surge application point T2 is attenuated by the primary protection element unit 4 and applied between the communication line connection terminal A2 and the earth port AG.

  On the other hand, the lightning surge voltage applied to the lightning surge application points T 1 and T 2 is attenuated by the decoupling circuit unit 3. Therefore, it is possible to prevent the lightning surge voltage applied to the lightning surge application points T1 and T2 from being applied to the opposing device without being attenuated. Therefore, the lightning surge test can be performed with high accuracy while the opposite device is operating.

(2-2) Next, a test method when a lightning surge voltage is applied between the communication line connection terminal A1 and the communication line connection terminal A2 will be described. Such application is referred to as “lateral application”.

The ground terminal 10 of the input unit 1 is connected to the ground G.
The connection between the facing device, the device under test, the lightning surge generator 400 and the coupling / decoupling device 100 is the same as the connection in (2-1). In the coupling / decoupling device 100, each of the switches 65 and 66 causes each terminal to float. That is, the initial setting is changed. Other switch settings are the same as the settings in (2-1).

  On this basis, similarly to (2-1), the device under test and the counter device communicate with each other.

  Next, a positive or negative lightning surge voltage is generated at the high voltage port 4001 with respect to the ground port 4002 of the lightning surge generator 400.

  The lightning surge voltage is applied to the lightning surge application point T2 via the switch 201, the analog coupling circuit unit 207, and the output terminal 23.

  When the primary protection element unit 4 is disabled, the lightning surge voltage applied to the lightning surge application point T2 is not attenuated by the primary protection element unit 4 and is applied to the communication line connection terminal A2.

  When the primary protection element unit 4 is enabled, the lightning surge voltage applied to the lightning surge application point T2 is attenuated by the primary protection element unit 4 and applied to the communication line connection terminal A2.

  Further, the ground port 4002 of the lightning surge generator 400, the ground port (not shown) of the analog coupling circuit unit 207, the output terminal 24, the lightning surge application point T1, and the communication line connection terminals 45 and 41 of the primary protective element unit 4 A path connecting the communication line connections 15 and 11 of the input unit 1 and the communication line connection terminal 3001 is formed. Through this path, the lightning surge voltage or the attenuated voltage is applied between the communication line connection terminal A1 and the communication line connection terminal A2.

  On the other hand, similarly to (1-2), it is possible to prevent the lightning surge voltage from being applied to the opposing device 200 without being attenuated. Therefore, the lightning surge test can be performed with high accuracy while the opposing device 200 is operated.

(3) Test Method for Device Under Test 300 with Four Communication Line Connection Terminals Next, a test method when the device under test 300 includes four communication line connection terminals will be described.

(3-1) First, a test method when a lightning surge voltage is applied between the communication line connection terminals 3001 to 3004 and the earth port 3005 will be described. Such application is referred to as “longitudinal application”.

The ground terminal 10 of the input unit 1 is connected to the ground G.
The communication line connection terminals 11 to 14 of the input unit 1 are connected to the communication line connection terminals 3001 to 3004 of the device under test 300 via the communication line 3100, respectively. Communication line connection terminals 3001 and 3002 used in pairs are connected to communication line connection terminals 11 and 12, respectively. Communication line connection terminals 3003 and 3004 used in the set are connected to communication line connection terminals 13 and 14, respectively.
The ground connection terminal 19 of the input unit 1 is connected to the ground port 3005 of the device under test 300.

  The communication line connection terminals 51 to 54 of the output unit 5 are connected to the communication line connection terminals 2001 to 2004 of the opposite apparatus 200 via the communication line 2100, respectively. Communication line connection terminals 2001 and 2002 used in pairs are connected to communication line connection terminals 51 and 52, respectively. Communication line connection terminals 2003 and 2004 used in the set are connected to communication line connection terminals 53 and 54, respectively.

The ground port 2005 of the opposing device 200 is made floating.
The 0V terminal 20 and the lightning surge input terminal 21 of the coupling circuit unit 2 are connected to the ground port 4002 and the high voltage port 4001 of the lightning surge generator 400, respectively.

In the switch 201, the terminals 2011 and 2012 are connected, and the terminal 2013 is floated. That is, the initial setting is maintained.
In the switch 202, the terminals 2022 and 2023 are connected, and the terminal 2021 is put in a floating state. That is, the initial setting is maintained.
In the switch 203, the terminals 2031 and 2032 are connected, and the terminal 2033 is floated. That is, the initial setting is maintained.
In the switch 204, the terminals 2042 and 2043 are connected, and the terminal 2041 is put in a floating state. That is, the initial setting is maintained.
In each of the switches 205 and 206, each terminal is connected. That is, the initial setting is changed.

  When disabling the primary protection element unit 4, the terminals are connected to each of the switches 403 to 406. That is, the initial setting is changed. In each of the switches 407 and 408, each terminal is set in a floating state. That is, the initial setting is changed.

  On the other hand, when the primary protection element unit 4 is made effective, each of the switches 403 to 406 causes each terminal to float. That is, the initial setting is maintained. In addition, each of the switches 407 and 408 is connected to each terminal. That is, the initial setting is maintained.

  In addition, each of the switches 65 to 68 is connected to each terminal. That is, the initial setting is maintained.

  Next, the device under test 300 and the opposite device 200 communicate with each other. The configuration of the common mode choke coil 310 described with reference to FIGS. 3 and 4 blocks the communication signal of 26 kHz to 3.75 MHz in the case of ADSL and the communication signal of 26 kHz to 16.2 MHz in the case of VDSL. Can communicate.

  Next, a positive or negative lightning surge voltage is generated at the high voltage port 4001 with respect to the ground port 4002 of the lightning surge generator 400.

  This lightning surge voltage is applied to the lightning surge application point T1 via the switch 201, the triode gas arrester 209, the switch 202, and the output terminal 24.

  The lightning surge voltage is applied to the lightning surge application point T2 via the switch 201, the triode gas arrester 209, and the output terminal 23.

  The lightning surge voltage is connected to the lightning surge application point T3 via the switches 205 and 203, the triode gas arrester 211, the switch 204, and the output terminal 25.

  The lightning surge voltage is applied to the lightning surge application point T4 via the switches 205 and 203, the triode gas arrester 211, and the output terminal 26.

  When the primary protection element unit 4 is disabled, the lightning surge voltage applied to the lightning surge application points T1 to T4 is not attenuated by the primary protection element unit 4, and the lightning surge voltage applied to the lightning surge application point T1 is The lightning surge voltage applied between the communication line connection terminal 3001 of the device under test 300 and the earth port 3005 and applied to the lightning surge application point T2 is between the communication line connection terminal 3002 of the device under test 300 and the earth port 3005. The lightning surge voltage applied to the lightning surge application point T3 is applied between the communication line connection terminal 3003 of the device under test 300 and the earth port 3005, and the lightning surge voltage applied to the lightning surge application point T4 is applied. The voltage is applied between the communication line connection terminal 3004 and the earth port 3005 of the test apparatus 300.

  When the primary protection element unit 4 is enabled, the lightning surge voltage applied to the lightning surge application points T1 to T4 is attenuated by the primary protection element unit 4 and the lightning surge voltage applied to the lightning surge application point T1. The attenuated voltage is applied between the communication line connection terminal 3001 of the device under test 300 and the earth port 3005, and the voltage after attenuation of the lightning surge voltage applied to the lightning surge application point T2 is the communication line of the device under test 300. A voltage after attenuation of the lightning surge voltage applied between the connection terminal 3002 and the earth port 3005 and applied to the lightning surge application point T3 is applied between the communication line connection terminal 3003 of the device under test 300 and the earth port 3005. The voltage after attenuation of the lightning surge voltage applied to the lightning surge application point T4 is applied between the communication line connection terminal 3004 and the earth port 3005 of the device under test 300.

  On the other hand, the lightning surge voltage applied to the lightning surge application points T <b> 1 to T <b> 4 is attenuated by the decoupling circuit unit 3. Therefore, the lightning surge voltage applied to the lightning surge application points T1 to T4 can be prevented from being applied to the opposing device 200 without being attenuated. Therefore, the lightning surge test can be performed with high accuracy while the opposing device 200 is operated.

(3-2) Next, a test method when lightning surge voltage is applied between the communication line connection terminal 3001 and the communication line connection terminal 3002 and between the communication line connection terminal 3003 and the communication line connection terminal 3004 will be described. To do. Such application is referred to as “lateral application”.

The ground terminal 10 of the input unit 1 is connected to the ground G.
The connection between the facing device 200, the device under test 300, the lightning surge generator 400 and the coupling / decoupling device 100 is the same as the connection in (3-1). The switch setting in the coupling / decoupling device 100 differs from the setting in (3-1) in the following points.

In the switch 202, the terminals 2021 and 2023 are connected, and the terminal 2022 is floated. That is, the initial setting is changed.
In the switch 204, the terminals 2041 and 2043 are connected, and the terminal 2042 is set in a floating state. That is, the initial setting is changed.
In this way, the switches 202 and 204 are provided, and the vertical application and the horizontal application are switched by changing the setting, so that the switching can be performed without removing or attaching the wiring. Therefore, the trouble of attaching / detaching the wiring can be saved. In addition, safety is improved because an operator does not touch the high voltage portion when the wiring is removed.

  In addition, each of the switches 65 to 68 causes each terminal to float. That is, the initial setting is changed.

  On this basis, similarly to (3-1), the device under test 300 and the opposite device 200 communicate with each other.

  Next, a positive or negative lightning surge voltage is generated at the high voltage port 4001 with respect to the ground port 4002 of the lightning surge generator 400.

  This lightning surge voltage is applied to the lightning surge application point T2 via the switch 201, the triode gas arrester 209, and the output terminal 23.

  When the primary protection element unit 4 is disabled, the lightning surge voltage applied to the lightning surge application point T2 is not attenuated by the primary protection element unit 4 and is applied to the communication line connection terminal 3002 of the device under test 300.

  When the primary protective element unit 4 is enabled, the lightning surge voltage applied to the lightning surge application point T2 is attenuated by the primary protective element unit 4 and applied to the communication line connection terminal 3002 of the device under test 300.

  In addition, the earth port 4002 of the lightning surge generator 400, the triode gas arrester 210 of the coupling circuit unit 2, the switch 202, the output terminal 24, the lightning surge application point T1, and the communication line connection terminals 45 and 41 of the primary protection element unit 4 A path connecting the communication line connections 15 and 11 of the input unit 1 and the communication line connection terminal 3001 is formed. Through this path, the lightning surge voltage or the attenuated voltage is applied between the communication line connection terminal 3001 and the communication line connection terminal 3002.

  The lightning surge voltage is applied to the lightning surge application point T4 via the switches 205 and 203, the triode gas arrester 211, and the output terminal 26.

  When the primary protection element unit 4 is disabled, the lightning surge voltage applied to the lightning surge application point T4 is not attenuated by the primary protection element unit 4 and is applied to the communication line connection terminal 3004 of the device under test 300.

  When the primary protection element unit 4 is validated, the lightning surge voltage applied to the lightning surge application point T4 is attenuated by the primary protection element unit 4 and applied to the communication line connection terminal 3004 of the device under test 300.

  Further, the earth port 4002 of the lightning surge generator 400, the switch 206 of the coupling circuit unit 2, the tripolar gas surge arrester 212, the switch 204, the output terminal 25, the lightning surge application point T3, and the communication line connection terminal of the primary protective element unit 4 47, 43, the communication line connection 17, 13 of the input unit 1, and the communication line connection terminal 3003 are formed. Through this path, the lightning surge voltage or the attenuated voltage is applied between the communication line connection terminal 3003 and the communication line connection terminal 3004.

  On the other hand, the lightning surge voltage is attenuated by the resistors 61 and 62 in the same manner as (1-2).

  Also, the high voltage port 4001, the switch 205, the switch 203, the triode gas arrester 211, the output terminal 26, the lightning surge application point T4, the winding 304, the resistor 64, the communication line connection terminal 2004, the internal circuit of the opposing device 200, A path connecting the communication line connection terminal 2003, the resistor 63, the winding 303, the lightning surge application point T3, the output terminal 25, the switch 204, the triode gas arrester 212, the switch 206, and the earth port 4002 of the lightning surge generator 400 is formed. Is done. The lightning surge voltage is attenuated by the resistors 63 and 64.

  Therefore, it is possible to prevent the lightning surge voltage from being applied to the opposing device 200 without being attenuated. Therefore, the lightning surge test can be performed with high accuracy while the opposing device 200 is operated.

(4) Method for testing an analog device under test having four communication line connection terminals Next, a method for testing an analog device under test (not shown) having four communication line connection terminals will be described.

(4-1) First, a test for applying a lightning surge voltage between four communication line connection terminals (referred to as communication line connection terminals A1 to A4) and an earth port (referred to as an earth port AG) of an analog device under test. A method will be described. Such application is referred to as “longitudinal application”.

The ground terminal 10 of the input unit 1 is connected to the ground G.
The communication line connection terminals 11 to 14 of the input unit 1 are connected to the communication line connection terminals A1 to A4 via the communication lines, respectively. The communication line connection terminals A1 and A2 used in the set are connected to the communication line connection terminals 11 and 12, respectively. Communication line connection terminals A3 and A4 used in the set are connected to communication line connection terminals 13 and 14, respectively.

The ground connection terminal 19 of the input unit 1 is connected to the ground port AG.
The communication line connection terminals 51 to 54 of the output unit 5 are respectively connected to four communication line connection terminals (referred to as communication line connection terminals B1 to B4) of the analog counter device via communication lines. The communication line connection terminals B1 and B2 used in the set are connected to the communication line connection terminals 51 and 52, respectively. Communication line connection terminals B3 and B4 used in the set are connected to communication line connection terminals 53 and 54, respectively.

The ground port (referred to as the ground port BG) of the opposing device 200 is made floating.
The 0V terminal 20 and the lightning surge input terminal 21 of the coupling circuit unit 2 are connected to the ground port 4002 and the high voltage port 4001 of the lightning surge generator 400, respectively.

In the switch 201, the terminals 2011 and 2013 are connected, and the terminal 2012 is floated. That is, the initial setting is changed.
In the switch 203, the terminals 2031 and 2033 are connected, and the terminal 2032 is floated. That is, the initial setting is changed.
In the switch 205, each terminal is connected. That is, the initial setting is changed.

  When the primary protection element unit 4 is disabled, the terminals are connected by the switches 403 and 404, respectively. That is, the initial setting is changed. In the switch 407, each terminal is floated. That is, the initial setting is changed.

  On the other hand, when the primary protective element unit 4 is made effective, the terminals are floated by the switches 403 and 404, respectively. That is, the initial setting is maintained. In the switch 407, each terminal is connected. That is, the initial setting is maintained.

Next, the analog device under test and the opposite device communicate with each other.
Next, a positive or negative lightning surge voltage is generated at the high voltage port 4001 with respect to the ground port 4002 of the lightning surge generator 400.

The lightning surge voltage is applied to the lightning surge application points T1 and T2 via the switch 201, the analog coupling circuit unit 207, and the output terminals 23 and 24.
The lightning surge voltage is applied to the lightning surge application points T3 and T4 via the switches 205 and 203, the analog coupling circuit unit 208, and the output terminals 25 and 26.

  When the primary protection element unit 4 is disabled, the lightning surge voltage applied to the lightning surge application points T1 to T4 is not attenuated by the primary protection element unit 4, and the lightning surge voltage applied to the lightning surge application point T1 is The lightning surge voltage applied between the communication line connection terminal A1 and the earth port AG and applied to the lightning surge application point T2 is applied between the communication line connection terminal A2 and the earth port AG and applied to the lightning surge application point T3. The lightning surge voltage thus applied is applied between the communication line connection terminal A3 and the earth port AG, and the lightning surge voltage applied to the lightning surge application point T4 is applied between the communication line connection terminal A4 and the earth port AG.

  When the primary protection element unit 4 is enabled, the lightning surge voltage applied to the lightning surge application points T1 to T4 is attenuated by the primary protection element unit 4 and the lightning surge voltage applied to the lightning surge application point T1. The attenuated voltage is applied between the communication line connection terminal A1 and the earth port AG, and the attenuated voltage of the lightning surge voltage applied to the lightning surge application point T2 is between the communication line connection terminal A2 and the earth port AG. The voltage after attenuation of the lightning surge voltage applied to the lightning surge application point T3 is applied between the communication line connection terminal A3 and the earth port AG, and the lightning surge voltage applied to the lightning surge application point T4 is attenuated. The later voltage is applied between the communication line connection terminal A4 and the earth port AG.

  On the other hand, the lightning surge voltage applied to the lightning surge application points T <b> 1 to T <b> 4 is attenuated by the decoupling circuit unit 3. Therefore, it is possible to prevent the lightning surge voltage applied to the lightning surge application points T1 to T4 from being applied to the opposing device without being attenuated. Therefore, the lightning surge test can be performed with high accuracy while the opposite device is operating.

(4-2) Next, a lightning surge voltage is applied between the communication line connection terminal A1 and the communication line connection terminal A2 of the analog device under test and between the communication line connection terminal A3 and the communication line connection terminal A4. The test method for the case will be described. Such application is referred to as “lateral application”.

The ground terminal 10 of the input unit 1 is connected to the ground G.
The connection between the facing device, the device under test, the lightning surge generator 400 and the coupling / decoupling device 100 is the same as the connection in (4-1). In the coupling / decoupling device 100, each of the switches 65 to 68 causes each terminal to float. That is, the initial setting is changed. Other switch settings are the same as the settings in (4-1).

  On this basis, similarly to (4-1), the device under test and the opposite device communicate with each other.

  Next, a positive or negative lightning surge voltage is generated at the high voltage port 4001 with respect to the ground port 4002 of the lightning surge generator 400.

  The lightning surge voltage is applied to the lightning surge application point T2 via the switch 201, the analog coupling circuit unit 207, and the output terminal 23.

  When the primary protection element unit 4 is disabled, the lightning surge voltage applied to the lightning surge application point T2 is not attenuated by the primary protection element unit 4 and is applied to the communication line connection terminal A2.

  When the primary protection element unit 4 is enabled, the lightning surge voltage applied to the lightning surge application point T2 is attenuated by the primary protection element unit 4 and applied to the communication line connection terminal A2.

  Also, the ground port 4002 of the lightning surge generator 400, the analog coupling circuit unit 207, the output terminal 24, the lightning surge application point T1, the communication line connection terminals 45 and 41 of the primary protective element unit 4, and the communication line connection of the input unit 1 15, 11 and a path connecting the communication line connection terminals 3001 is formed. Through this path, the lightning surge voltage or the attenuated voltage is applied between the communication line connection terminal A1 and the communication line connection terminal A2.

  The lightning surge voltage is applied to the lightning surge application point T4 via the switches 205 and 203, the analog coupling circuit unit 208, and the output terminal 26.

  When the primary protection element unit 4 is disabled, the lightning surge voltage applied to the lightning surge application point T4 is not attenuated by the primary protection element unit 4 and is applied to the communication line connection terminal A4.

  When the primary protection element unit 4 is enabled, the lightning surge voltage applied to the lightning surge application point T4 is attenuated by the primary protection element unit 4 and applied to the communication line connection terminal A4.

  Also, the ground port 4002 of the lightning surge generator 400, the ground port (not shown) of the analog coupling circuit unit 208, the output terminal 25, the lightning surge application point T3, and the communication line connection terminals 47 and 43 of the primary protective element unit 4 A path connecting the communication line connections 17 and 13 of the input unit 1 and the communication line connection terminal A3 is formed. Through this path, the lightning surge voltage or the attenuated voltage is applied between the communication line connection terminal A3 and the communication line connection terminal A4.

  On the other hand, similarly to (3-2), it is possible to prevent the lightning surge voltage from being applied to the opposing device 200 without being attenuated.

  An example of the results of the test method described in (1) and (3) above will be described.

  In this test, a VDSL modem having a transmission rate of 50 Mbps was used as the device under test 300 and the opposite device 200. The communication speed could be set to 25.7 Mbps for downlink and 7.9 Mbps for uplink. .

  The waveform of the lightning surge voltage was a waveform having a wave front length of 10 us and a wave tail length of 700 us. The current limiting resistance was 25Ω. The charging voltage of the lightning surge generator 400 was 15 kV.

  No abnormality occurred in both the device under test 300 and the opposing device 200 after application of the lightning surge voltage.

  The configuration of the coupling / decoupling device 100 that can be used for the tests (1) to (4) and the test methods have been described above. When only the tests (1) and (2) need to be performed, The following may be used.

  In the input unit 1, the communication line connection terminals 13, 14, 17, and 18 may not be provided.

  In the coupling circuit unit 2, the switches 203, 204, 205 and 206, the triode gas arrester 211 and 212, and the output terminals 25 and 25 may not be provided.

  In the decoupling circuit unit 3, the windings 303 and 304 and the wire connection terminals 33, 34, 37, and 38 need not be provided. In this case, the windings 301 and 302 may be wound in parallel.

  In the primary protection element unit 4, the subscriber protector 402, the switches 405, 406, and 408, the grounding resistor 410, and the communication line connection terminals 43, 44, 47, and 48 need not be provided.

  In the output unit 5, the communication line connection terminals 53, 54, 57, and 58 need not be provided.

  Further, the unbalanced line 28 may not be provided.

  Also, the communication line (balanced line) 49 is not provided, and the communication line connection terminals 15 and 16 of the input unit 1 are connected to the communication line connection terminal 41 of the primary protective element unit 4 via two communication lines (balanced lines). To 44 respectively.

  Further, the communication line (balanced line) 59 is not provided, and the communication line connection terminals 55 and 56 of the output unit 5 are connected to the wire connection terminal 31 of the decoupling circuit unit 3 via the two communication lines (balanced lines). 32 may be connected to each other.

  Further, the communication line (balanced line) 39 is not provided, and the wire connection terminals 35 and 36 of the decoupling circuit unit 3 are connected to the communication line connection terminal of the primary protective element unit 4 via two communication lines (balanced lines). What is necessary is just to connect to 45 and 46, respectively.

  In the tests of (1) and (2), each of the device under test and the counter device has been described as including two communication line connection terminals, but each of the device under test and the counter device has four communication lines. Even when two connection terminals are provided, the same operation may be performed.

  In this embodiment, the VDSL modem is used as the device under test 300 and the opposite device 200. However, the present invention is not limited to this, and can be applied to communication devices such as other IT devices. .

It is a circuit diagram which shows the lightning surge test circuit to which the coupling / decoupling device concerning one Embodiment of this invention is applied. FIG. 3 is a perspective view in which a part of the coupling / decoupling device 100 is cut away. 3 is a circuit diagram of a common mode choke coil 310. FIG. It is a side view of the common mode choke coil 310 with a part cut away. 5 is a diagram illustrating an example of common mode impedance characteristics in a common mode choke coil 310. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Input part 1A, 19 ... Ground connection terminal 2 ... Coupling circuit part 3 ... Decoupling circuit part 4 ... Primary protection element part 5 ... Output part 10 ... Ground terminal 11-18, 41-48, 51-58, 2001 2004, 3001-3004 ... Communication line connection terminal 20 ... 0V terminal 21 ... Lightning surge input terminal 23-26 ... Output terminal 27, 28 ... Unbalanced line 31-38 ... Wire connection terminal 39, 49, 59, 2100, 3100 ... Communication line 40, 2005, 3005, 4002 ... Earth port 50 ... Earth connection terminal 61-64 ... Resistance 100 ... Coupling / decoupling device 101 ... Housing 200 ... Opposing device 65-68, 201-206, 403-408 ... Switch 207, 208 ... Analog coupling circuit section 209-212 ... Tripolar gas surge arrester 300 ... Device under test 301-304 ... Winding 305 ... Yen Tube housing 306 to 309 ... Bobbin 310 ... Common mode choke coil 380 ... Air gap 400 ... Lightning surge generator 401, 402 ... Subscriber protector 409, 410 ... Ground resistance 1011, 1012 ... Side surface 3061-3091 ... Split coil 4001 ... High voltage port G ... Ground T1-T4 ... Lightning surge application point

Claims (11)

A coupling / decoupling device installed between the device under test and the counter device of the lightning surge test circuit in which the device under test and the counter device are connected to an xDSL communication line using a metal subscriber line,
A coupling circuit unit provided between a lightning surge generator for generating a lightning surge voltage and an application point of the lightning surge voltage to the communication line, and applying the lightning surge voltage to the application point;
A decoupling circuit portion provided on the opposite device side from the application point and preventing the applied lightning surge voltage from being applied to the opposite device;
A primary protection element portion that is provided on the device under test side from the application point and capable of attenuating the applied lightning surge voltage;
A communication line connection terminal provided between the primary protection element unit and the device under test and connected to the communication line in a one-to-one relationship when four communication lines are connected to the device under test; In the case where two communication lines are connected to the device under test, the communication line is connected to the two adjacent communication line connection terminals among the communication line connection terminals in a one-to-one relationship. And
A communication line connecting terminal that is installed between the decoupling circuit unit and the opposing device and is connected to the communication line on a one-to-one basis when four communication lines are connected to the opposing device; An output unit in which the communication line when two communication lines are connected to the opposite device is connected to the two adjacent communication line connection terminals of the communication line connection terminals on a one-to-one basis; A coupling / decoupling device characterized by comprising: The coupling circuit unit is
A longitudinal application coupling circuit for applying the lightning surge voltage between the communication line of the device under test and the ground;
A lateral application coupling circuit for applying the lightning surge voltage between the communication lines of the device under test;
A function of selecting one of the vertical application coupling circuit section and the horizontal application coupling circuit section,
The coupling / decoupling device according to claim 1, wherein the vertical application coupling circuit unit is selected in an initial setting. The coupling circuit unit is
A lightning surge input terminal to which a positive or negative lightning surge voltage generated by the lightning surge generator is applied,
A 0V terminal that serves as a reference for the lightning surge voltage;
A triode gas arrester that is an automatic return switch function element that allows the lightning surge voltage to pass through without adversely affecting the communication signal of xDSL;
Two electrodes other than the ground electrode of the triode gas surge arrester are each connected to the application point,
Configured to apply the lightning surge voltage to the ground electrode,
The coupling / decoupling device according to claim 1 or 2, wherein The coupling circuit unit is
a coupling circuit section for xDSL,
An analog coupling circuit,
A function of selecting one of the coupling circuit unit for xDSL and the coupling circuit unit for analog;
4. The coupling / decoupling device according to claim 1, wherein the xDSL coupling circuit unit is selected in an initial setting. 5. The decoupling circuit unit includes:
The coupling / decoupling device according to any one of claims 1 to 4, further comprising a common mode choke coil configured by connecting a plurality of air-core cylindrical coils that allow xDSL communication signals to pass in series. The common mode choke coil is
An insulator having an outer diameter that can be inserted into the inner diameter of the bobbin without looseness inside a plurality of cylindrical coils formed by winding an electric wire coated with an insulating material in two or four parallel windings around a cylindrical bobbin By inserting a cylindrical casing made of resin and forming a coaxial structure between the cylindrical coil and the cylindrical casing, the plurality of cylindrical coils are arranged in the axial direction between the cylindrical coils. The coupling / decoupling device according to claim 5, wherein the coupling / decoupling device has a structure capable of matching the central axis of the magnetic flux generated in step 1. The primary protective element portion is
A subscriber protector is provided between the application point and the input unit,
When performing a lightning surge test in which the primary protection element portion is invalid, it has a function of selecting a route without the subscriber protector,
The coupling / decoupling device according to any one of claims 1 to 6, wherein a route having the subscriber protector is selected in an initial setting. The primary protective element portion is
When a route with the subscriber protector is selected, one end of a ground resistor simulating a ground resistor is connected to the ground terminal of the subscriber protector, and the primary connected to the ground connection terminal of the input unit The other end of the grounding resistor is connected to the earth port of the protective element,
When a route without the subscriber protector is selected, the ground resistor is not connected, and the subscriber protector is provided with a function of establishing a state of being insulated from the ground. Item 8. The coupling / decoupling device according to Item 7. The input unit is
Four communication line connection terminals for connecting the communication lines of the device under test;
An earth connection terminal for connecting an earth port of the device under test;
A ground terminal for holding the coupling / decoupling device at a zero potential;
The earth terminal, the earth connection terminal, the earth port of the primary protection element part, and the 0V terminal of the coupling circuit part are connected,
When the device under test corresponds to connecting two communication lines and communicating with the opposite device, only two communication line connection terminals among the four communication line connection terminals The coupling / decoupling device according to claim 1, wherein the coupling / decoupling device is configured to be used. The output unit is
Comprising four communication line connection terminals for connecting the communication lines of the opposing device;
In the case where the opposite device supports two communication lines connected to communicate with the device under test, only two communication line connection terminals among the four communication line connection terminals are used. The coupling / decoupling device according to claim 1, wherein the coupling / decoupling device is configured to be usable. The input unit, the coupling circuit unit, and the primary protection element unit are:
Provided on one of the four side surfaces of the housing of the coupling / decoupling device;
The output unit is
The coupling / decoupling device according to any one of claims 1 to 10, wherein the coupling / decoupling device is provided on a side surface facing the one side surface.

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