KR102046908B1 - LED Patch Panel Analyzer - Google Patents

Abstract

The present invention relates to an LED patch panel analyzer capable of monitoring a connection state as well as a transmission and reception state between a switch hub and a terminal device. The LED patch panel analyzer provided between the switch hub and the terminal device to check the communication connection between the switch hub and the terminal device through an LED comprises: a plurality of input ports connected to the switch hub; a plurality of output ports electrically connected to the plurality of input ports, respectively; a first communication driving circuit unit connected between the input port and the output port and driven by receiving a communication signal between the switch hub and the terminal device; a signal conversion circuit unit converting an output signal of the first communication driving circuit unit into a comparison target signal; a comparison circuit unit comparing an output of the signal conversion circuit unit with a reference signal; and an RX communication display unit lighting up a communication confirmation LED by the output of the comparison circuit unit. According to the present invention, the connection state of a line can be displayed without affecting a main communication line by using the communication driving circuit driven by being connected in parallel with a communication line between the switch hub and the terminal device, and an uninterrupted line transfer work without interruption of an existing communication line can be possible even in the case of a line transfer work.

Description

LED Patch Panel Analyzer {LED Patch Panel Analyzer}

The present invention relates to an LED patch panel analyzer, and more particularly, it is possible to monitor not only the connection state between the switch hub and the terminal device but also the transmission and reception state so that the operation can be performed without interrupting the communication environment even during a line transfer operation. It's about a new LED patch panel analyzer.

In general, a local area network (LAN) cable is connected to a terminal device such as a computer device or a key phone. Typically, UTP (Unshielded Twisted Pair) cable, which is a standard signal line used in a LAN card, is connected, and a connector of the RJ-45 standard is coupled to the terminal of the cable.

UTP cable is a kind of signal line connecting general telephone line or LAN environment. It is mainly used to connect a keyphone or computer device to a switch hub. A switch hub is a device that supports multiple LAN ports for connecting to a host and is equipped with an exchange function that transmits input data from multiple ports at the same time. It is used.

1 is a block diagram illustrating a connection relationship between a general LED patch panel. As shown in FIG. 1, an LED patch panel 20 is installed between the switch hub 10 and the terminal devices 40 and 50. The LED patch panel 20 includes an input port corresponding to each port of the switch hub 10 and an output port corresponding to the terminal devices 40 and 50. Each of the output ports is electrically connected to a terminal port 30 for connection with the terminal devices 40 and 50, embedded in a wall near the terminal device, or a port for connecting other terminal devices.

LED patch panel 20 is installed with an LED connected to each port. This LED is turned on when the terminal device 40 or 50 is connected to the terminal port 30, when the switch hub 10 is disconnected and the transmitter is operated when the terminal device 40 or 50 is connected to the terminal port 30. The LED is displayed to indicate whether the terminal devices 40 and 50 are connected.

However, the conventional LED patch panel 20 passes only a communication signal in a state in which the switch hub 10 and the terminal devices 40 and 50 are normally connected, and there is a problem in that the connection state of the terminal devices 40 and 50 cannot be displayed. . That is, when there is a communication signal, the function of detecting a connection state and the communication signal cannot be separated, so that the operation of checking whether the terminal is connected to the correct port for each of the terminal devices 40 and 50 is performed. There is a problem that must be accompanied.

In addition, the conventional LED patch panel is only to check the electrical connection state and disconnection of the line, there is a need to use a separate LAN tester when looking for a UTP cable connected to the terminal device. For example, since the terminal device and the LED patch panel are remote from each other, there is a need to perform a task of confirming a match by transmitting and receiving a signal by connecting a pair of LAN testers to spaced ports.

Republic of Korea Patent Registration No. 10-1769607

The present invention provides an LED patch panel analyzer of a new structure that can display a connection state of a line even when a communication line between a switch hub and a terminal device is connected by including a separate communication driving circuit, thereby enabling non-stop line switching. There is a purpose.

In addition, the present invention can easily check the matching state between each port of the patch panel and the port of the switch hub, or the matching state between each port of the patch panel and the terminal port using the communication between the separate tester unit and the patch panel, In addition, another object of the present invention is to provide an LED patch panel analyzer for checking whether a terminal device is connected to a terminal port.

The LED patch panel analyzer according to an embodiment of the present invention is installed between the switch hub and the terminal device, the LED patch panel analyzer that can confirm the communication connection between the switch hub and the terminal device through the LED, which is connected to the switch hub A plurality of input ports; A plurality of output ports electrically connected to each of the plurality of input ports; A first communication driving circuit unit connected between the input port and the output port to receive and drive a communication signal between the switch hub and the terminal device; A signal conversion circuit unit converting an output signal of the first communication driving circuit unit into a comparison target signal; A comparison circuit unit for comparing an output of the signal conversion circuit unit with a reference signal; And an RX communication display unit which lights and drives the communication confirmation LED by the output of the comparison circuit unit.

In an LED patch panel analyzer according to another embodiment of the present invention, the first communication driving circuit unit receives a half-duplex communication chip connected in parallel with a communication line between the switch hub and the terminal device in parallel. It is applied to.

In the LED patch panel analyzer according to another embodiment of the present invention, the half-duplex communication chip is a communication chip of RS-485 series.

In the LED patch panel analyzer according to another embodiment of the present invention, the signal conversion circuit unit is connected to the receiving signal output terminal (RO) of the parallel communication chip in series and the DC of the signal output at the TTL (Transistor-Transistor Logic) level A filter capacitor C2 for removing a component and an integration capacitor C3 connected in parallel between the filter capacitor C2 and a ground terminal to integrate an AC component of the signal to generate the comparison target signal, The comparison circuit unit may include an OP-AMP receiving the comparison target signal through an inverting terminal and receiving the reference signal through a non-inverting terminal to generate a driving signal of the communication confirmation LED.

According to another embodiment of the present invention, an LED patch panel analyzer may include: a first state of shutting off power, a second state of generating a VCC power supply for a LAN test for checking a port connection state between the output port and the terminal device; A tester switch circuit unit for switching between third states of grounding a portion of the VCC power line; A first oscillation circuit unit receiving the VCC power and generating a first oscillation signal; A second oscillation circuit unit receiving the VCC power and generating a second oscillation signal having a higher frequency than that of the first oscillation signal; A clock generation circuit unit configured to synthesize the first oscillation signal and the second oscillation signal to generate a clock for a LAN test; A second communication driving circuit unit configured to receive the LAN test clock as a driving signal, and to transmit a test clock to the first communication driving circuit unit to blink and drive the communication confirmation LED of the RX communication display unit; And a tester unit including a terminal connection display unit which is triggered when the tester switch circuit unit is switched to the third state to turn on the terminal connection confirmation LED when the terminal device is connected to the terminal port.

In the LED patch panel analyzer according to another embodiment of the present invention, the first oscillation signal has a frequency of 1Hz, the second oscillation signal has a frequency of 60Hz or more.

The LED patch panel analyzer according to another embodiment of the present invention further includes a tester unit operation display unit for driving the LED for displaying the tester unit operation by flashing by the first oscillation signal.

In the LED patch panel analyzer according to another embodiment of the present invention, the second communication driving circuit unit applies a half-duplex communication chip of the RS-485 series as a transmission circuit.

According to another embodiment of the present invention, an LED patch panel analyzer may include a first NAND gate U103: A for receiving the second oscillation signal as two inputs and outputting an inverted clock, and the first oscillation. A signal is received as one input and the other input is connected to the VCC power supply when the tester switch circuit portion is switched to the second state and to the ground side when the tester switch circuit portion is switched to the third state. And two NAND gates U103: B.

According to the LED patch panel analyzer of the present invention, it is possible to display the connection state of the line without affecting the main communication line by using a communication driving circuit driven in parallel with the communication line between the switch hub and the terminal device, Even when the work of switching the line is in progress, there is an effect of enabling an uninterrupted line switching operation without interrupting the existing communication line.

In addition, the present invention is to switch the tester switch circuit unit provided in the separate tester unit to the second state by using the communication between the patch panel, the matching state between each port of the patch panel and the port of the switch hub, or each port of the patch panel It is easy to check the matching state between the terminal and the terminal port, and furthermore, by switching the tester switch circuit unit to the third state to check whether the terminal device is connected to the terminal port, without using a separate LAN tester equipment. There is an effect that it is easy to check whether the matching and access of the terminal device.

1 is a block diagram illustrating a connection relationship of a general LED patch panel,
2 is a block diagram illustrating an LED patch panel analyzer according to the present invention;
3 is a circuit diagram illustrating a patch panel detection circuit for checking a communication line connection state between a switch hub and a terminal device in the present invention;
FIG. 4 is a circuit diagram illustrating a circuit of a tester unit for checking a matching state between ports and whether a terminal device is connected in the present invention.

Hereinafter, with reference to the accompanying drawings will be described a specific embodiment according to the present invention. However, this is not intended to limit the present invention to the specific embodiments, it should be understood to include all modifications, equivalents, and substitutes included in the spirit and scope of the present invention.

The same reference numerals are used for parts having similar configurations and operations throughout the specification. And the drawings attached to the present invention is for convenience of description, the shape and relative measures may be exaggerated or omitted.

In describing the embodiments in detail, overlapping descriptions or descriptions of obvious technology in the art are omitted. In addition, in the following description, when a portion "includes" another component, it means that the component can be further included in addition to the described component unless otherwise stated.

 In addition, the terms "~ unit", "~ base", "~ module" described in the specification means a unit for processing at least one function or operation, which may be implemented by hardware or software or a combination of hardware and software. Can be. In addition, when a part is electrically connected to another part, this includes not only the case where it is directly connected, but also the case where it is connected through the other structure in the middle.

Terms including ordinal numbers such as first and second may be used to describe various components, but the components are not limited by the terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the second component may be referred to as the first component, and similarly, the first component may also be referred to as the second component.

2 is a block diagram illustrating an LED patch panel analyzer according to the present invention. 2, the LED patch panel analyzer of the present invention is a device connected between the switch hub and the terminal device, and is separate from the reception detection circuits 110, 120, 130, and 140 provided in the LED patch panel 100. Transmission detection circuits 210, 220, 230, 240, 250, 260, and 270 provided in the tester unit 200 are included.

As described with reference to FIG. 1 in the background art, the LED patch panel 100 includes a plurality of input ports corresponding to each port of the switch hub 10 and a plurality of output ports connected corresponding to each of the input ports. Equipped. Each output port is electrically connected to a terminal port 30 located at a long distance (a distance of about several m to several hundred m) and a UTP cable. The terminal port 30 is connected to a terminal device such as a computer device 40 or a key phone 50.

2, the reception detection circuit of the LED patch panel 100 includes a first communication driving circuit unit 110, a signal conversion circuit unit 120, a comparison circuit unit 130, and an RX communication display unit 140. do.

The first communication driving circuit unit 110 is a circuit unit connected between the input port and the output port of the LED patch panel 100 to receive and drive a communication signal between the switch hub and the terminal device. In this case, the LED patch panel analyzer of the present invention is used for communication confirmation. On the other hand, when the LED patch panel analyzer of the present invention is used for LAN test and terminal connection confirmation, the second communication drive circuit unit 260 of the tester unit 200 to TX, and the first communication of the LED patch panel 100 The driving circuit unit 110 communicates with the RX to perform a test operation.

Preferably, the first communication driving circuit unit is a circuit in which a half-duplex communication chip operating in parallel with a communication line between the switch hub and the terminal device is applied as a receiving circuit.

The signal conversion circuit unit 120 converts the output signal of the first communication driving circuit unit 110 into a comparison target signal. The comparison circuit unit 130 compares the output of the signal conversion circuit unit 120 with the reference signal.

The RX communication display unit 140 lights up and drives the communication confirmation LED LD1 by the output of the comparison circuit unit 130. In addition, the RX communication display unit 140 performs a LAN test display function, and in this case, the communication confirmation LED LD1 is driven by blinking. A detailed description of the operation of the RX communication display unit 140 in parallel for the communication confirmation and LAN test will be described later.

Referring to FIG. 2, the transmission detection circuit of the tester unit 200 includes a first oscillation circuit unit 210, a second oscillation circuit unit 220, a clock generation circuit unit 230, a LAN test display unit 240, And a terminal connection display unit 250, a second communication driving circuit unit 260, and a tester switch circuit unit 270.

The tester switch circuit unit 270 may include a first state of disconnecting power, a second state of generating a VCC power supply for a LAN test to confirm a matching state between an output port of a patch panel and a switch hub or a terminal port, and a part of the VCC power line. It comprises a three-stage switch to switch between the third state to check whether the terminal device is connected to the terminal port by grounding.

The first oscillator circuit 210 and the second oscillator circuit 220 operate by being supplied with VCC power and generate different oscillation signals. The first oscillation signal is a signal for generating a blinking signal for the human eye to confirm. For example, the first oscillation signal has a frequency of 1 Hz and is used for checking whether the tester unit 200 is normally operated. The second oscillation signal is an oscillation signal having a higher frequency than the first oscillation signal, and is a signal for providing a driving clock for confirming the communication connection to the second communication driving circuit unit 260, for example, having a frequency of 60 Hz or more.

The clock generation circuit unit 230 generates a clock for a LAN test by combining the first oscillation signal and the second oscillation signal.

Although the LAN test display unit 240 is illustrated as being included in the tester unit 200, in practice, the RX communication display unit 140 provided in the LED patch panel 100 also functions as a LAN test display. It is illustrated as a separate configuration to help.

The LAN test display unit 240 has a matching state between the input port of the LED patch panel 100 and the port of the switch hub when the tester switch circuit unit 270 is switched to the second state, or the output of the LED patch panel 100. As a means for confirming a matching state between the port and the terminal port, when the LAN test clock of the second communication driver circuit unit 260 is transmitted to the first communication driver circuit unit 110, the communication confirmation LED LD1 blinks. It is a means to drive.

 The terminal connection display unit 250 includes a switching element Q101 which is triggered when the tester switch circuit unit 270 is switched to the third state, and when the terminal device is connected to the terminal port, the LED for confirming the terminal connection (D102). Drive lights up.

The second communication driving circuit unit 260 operates by receiving a communication connection checking clock as a driving signal and transmits a LAN test clock to the first communication driving circuit unit 110 of the LED patch panel 100. For example, when the tester unit 200 is connected to any port of the switch hub, the first communication driving circuit unit 110 assigned to the input port on the LED patch panel 100 connected to the corresponding port of the switch hub is used for LAN test. Receive the clock. In addition, as the communication test LED LD1 of the LAN test display unit 240 blinks and operates, a matching state between the port of the switch hub and the input port of the LED patch panel 100 may be checked. As another example, when the tester unit 200 is connected to the terminal port, the LAN communication clock is received by the first communication driving circuit unit 110 assigned to the output port on the LED patch panel 100 connected to the terminal port. In addition, while the communication check LED LD1 of the LAN test display unit 240 blinks and operates, a matching state between the terminal port and the output port of the LED patch panel 100 may be checked.

Like the first communication driving circuit unit 110, the second communication driving circuit unit 260 includes a half-duplex communication chip, and unlike the reception detection circuit, the second communication driving circuit unit 260 is configured of a circuit in which the half-duplex communication chip is applied as a transmission circuit. A specific circuit configuration and operation relationship of the transmission detection circuit will be described later with reference to FIG. 4.

3 is a circuit diagram illustrating a patch panel detection circuit for checking a communication line connection state between a switch hub and a terminal device in the present invention.

Referring to FIG. 3, the first communication driving circuit unit 110 is a communication chip of the RS-485 series, and is implemented as a MAX 485 chip U1 in this example. As illustrated, a pair of ports NO_3 and NO_6 on the LED patch panel analyzer are connected to the data terminals A and B. In order to use the communication chip as a receiving circuit, the RE terminal and the DE terminal are connected to ground to apply a low level. If a port is electrically connected to both the switch hub and the terminal device, a signal of a TTL (transistor-transistor logic) level is output from a received signal output terminal (RO) by a signal flowing between the two ports. .

The signal conversion circuit unit 120 is connected in series with the reception signal output terminal RO of the U1 chip to remove the DC component of the signal output at the TTL level, the filter capacitor C2, the filter capacitor C2, and the ground terminal. An integrated capacitor C3 is connected in parallel to integrate an AC component of the signal to generate a signal to be compared.

The comparison circuit unit 130 includes an OP-AMP that receives a comparison target signal through an inverting terminal and receives a reference signal through a non-inverting terminal to generate a driving signal of the communication confirmation LED.

RX communication display unit 140 includes a communication confirmation LED (LD1) connected between the VCC terminal and the output terminal of the OP-AMP.

When the TTL level output signal is generated in the first communication driving circuit unit 110, that is, when the switch hub and the terminal device are normally connected, the TTL level output signal is generated at the RO terminal of the U1 chip. After the time set in step 120, a signal having a level higher than or equal to the reference signal is output to the inverting terminal of the OP-AMP. As the output terminal of the OP-AMP drops to a low level, the communication confirmation LED (LD1) lights up.

At this time, since the first communication driving circuit unit 110 is a parallel communication chip of the RS-485 series, the communication between the switch hub and the terminal device is not affected even in an environment in which the switch hub and the terminal device exchange data. Therefore, even when the work of switching the line proceeds, it is possible to perform a non-stop line switching operation without interrupting the existing communication line.

FIG. 4 is a circuit diagram illustrating a circuit of a tester unit for checking a matching state between ports and whether a terminal device is connected in the present invention.

First, the tester switch circuit unit 270 illustrated in the lower part of FIG. 4 will be described. The tester switch circuit unit 270 includes a three-stage switch SW101 and a constant voltage regulator U105 for generating a VCC power supply DC 5V, which is an operating power source of the ICs constituting the circuit. As shown, the three-stage switch is an interlocked switch, where the first state is an OFF state which does not generate VCC power, and the second state and the third state are ON states where power is supplied to the constant voltage regulator U105. When the three-stage switch SW101 is placed in the second state or the third state, the VCC power is supplied to the entire circuit. On the other hand, when the three-stage switch SW101 is placed in the second state, the CHECK terminal is floated, and when it is in the third state, the CHECK terminal is connected to the ground side. In a second state, a LAN test operation for checking an electrical matching state between an input / output port of the LED patch panel 100 and a port or a terminal port of the switch hub is performed, and confirming whether the terminal device is connected to the terminal port in the third state. CHECK operation is performed.

Referring to FIG. 4, the first oscillator circuit 210 and the second oscillator circuit 220 each include an oscillator (eg, NE 555 chips U102 and U101) that generate an oscillation signal. The first oscillation circuit unit 210 generates a first oscillation signal having a low frequency, for example, 1 Hz, which can visually confirm that the LED is turned on, and the second oscillation circuit unit 220 controls the second communication driving circuit unit 260. A second oscillation signal, for example, a second oscillation signal of 60 Hz, is generated to drive the MAX 485 chip (U104), which is a communication chip of the RS-485 series.

The clock generation circuit unit 230 may be composed of a chip U103 including four NAND gates. Specifically, the clock generation circuit unit 230 receives the second oscillation signal as two inputs and outputs a first NAND gate U103: A for outputting an inverted clock, and the first oscillation signal as one input, and the other input is input. When the tester switch circuit unit 270 is switched to the second state, it is connected to the VCC power supply, and when the tester switch circuit unit 270 is switched to the third state, the second NAND gate U103: B connected to the ground side is connected. Include.

When the tester switch circuit 270 is in the second state, VCC power is connected to terminal 5 of the second NAND gate U103: B, and the second NAND gate U103: B is an inverted signal of the first oscillation signal. The clock corresponding to is outputted.

The tester unit operation display unit 290 is connected to an output terminal of the second NAND gate U103: B. The tester unit operation check LED D101 included in the tester unit operation display unit 290 blinks at a period of 1 Hz, indicating that the LAN test operation is performed.

Since the CHECK terminal is connected to the ground side when the tester switch circuit unit 270 is in the third state, the low level is always applied to the fifth terminal of the second NAND gate U103: B. Therefore, the second NAND gate U103: B generates a constant level of output irrespective of the first oscillation signal, the LAN test function is cut off, and the tester unit operation check LED D101 is turned off.

Referring to FIG. 4, the clock generation circuit unit 230 further includes a third NAND gate U103: C and a fourth NAND gate U103: D. As illustrated, the fourth NAND gate U103: D receives an output of the first NAND gate U103: A (ie, an inverted waveform of the second oscillation signal) and a first oscillation signal to output an inverted clock. The third NAND gate U103: C receives the output of the fourth NAND gate U103: D as two inputs and outputs an inverted clock.

Like the first driving circuit unit 110, the second communication driving circuit unit 260 is composed of a MAX 485 chip (U104), which is a communication chip of the RS-485 series, except that only the U104 chip is used as a transmission circuit. As such, by applying the first communication driving circuit unit 110 and the second communication driving circuit unit 260 to the same communication chip, product design can be simplified, manufacturing cost can be reduced, and maintenance can be facilitated.

As illustrated, a pair of ports NO_3 and NO_6 on the LED patch panel analyzer are connected to the data terminals A and B. In order to use the communication chip as a transmission circuit, the RE terminal and the DE terminal were connected to the VCC terminal to apply a high level. The output terminal of the third NAND gate U103: C is connected to a drive input terminal DI of the U104 chip. Therefore, when the tester switch circuit unit 270 is switched to the second state, the second communication circuit unit 260 and the first communication circuit unit 110 communicate with each other, and when the tester switch circuit unit 270 is switched to the third state, the RE terminal and the DE terminal are grounded. The second communication circuit unit 260 and the first communication circuit unit 110 are switched to a state in which they do not communicate with each other. In this third state, it may be checked whether the terminal device is connected to the terminal port.

Referring to FIG. 4, the sixth terminal No_6 among the terminals of the output port is grounded through the resistor R108, and the cathode terminal of the terminal connection confirmation LED D102 is connected to the third terminal No_3. The terminal connection display unit 250 includes a switching device Q101 which is triggered when the tester switch circuit unit 270 is switched to the third state. As shown in FIG. When the terminal No_3 and the sixth terminal No_6 are connected, the terminal connection confirmation LED D102 is turned on.

That is, after checking the matching of the output port and the terminal port of the patch panel by switching the tester switch circuit unit 270 to the second state, when the tester switch circuit unit 270 is switched to the third state, the terminal 3 of the output port and It is possible to check whether the terminal 6 is connected (ie, whether the terminal is connected to the terminal port). For example, if the terminal port is empty, the connection between the terminals is floated so that the terminal connection confirmation LED 102 is turned off. If the terminal device is connected to the terminal port, a closed circuit is configured so that the terminal connection confirmation LED 102 is located. ) Lights up.

Various modifications are possible in the invention disclosed above without departing from the basic idea. That is, the above embodiments should all be interpreted as illustrative and not restrictive. Therefore, the protection scope of the present invention should be determined according to the appended claims rather than the above-described embodiments, and if the components defined in the appended claims are replaced by equivalents, they should be regarded as belonging to the protection scope of the present invention.

100: LED patch panel 110: first communication drive circuit portion
120: signal conversion circuit section 130: comparison circuit section
140: RX communication display unit 200: tester unit
210: first oscillation circuit portion 220: second oscillation circuit portion
230: clock generation circuit section 240: LAN test display section
250: terminal connection display unit 260: second communication drive circuit unit
270: tester switch circuit portion 290: tester unit operation display portion

Claims (9)

In the LED patch panel analyzer installed between the switch hub and the terminal device to check the communication connection between the switch hub and the terminal device through the LED,
A plurality of input ports connected to the switch hub;
A plurality of output ports electrically connected to each of the plurality of input ports;
A first communication driving circuit unit connected between the input port and the output port to receive and drive a communication signal between the switch hub and the terminal device;
A signal conversion circuit unit converting an output signal of the first communication driving circuit unit into a comparison target signal;
A comparison circuit unit for comparing an output of the signal conversion circuit unit with a reference signal;
An RX communication display unit lighting and driving a communication confirmation LED by an output of the comparison circuit unit; And
Tester unit
Including;
The tester unit,
Switching between a first state of shutting off power, a second state of generating a VCC power supply for a LAN test for confirming a port connection state between the output port and the terminal device, and a third state of grounding a part of the VCC power lines A tester switch circuit portion;
A first oscillation circuit unit receiving the VCC power and generating a first oscillation signal;
A second oscillation circuit unit receiving the VCC power and generating a second oscillation signal having a higher frequency than that of the first oscillation signal;
A clock generation circuit unit configured to synthesize the first oscillation signal and the second oscillation signal to generate a clock for a LAN test;
A second communication driving circuit unit configured to receive the LAN test clock as a driving signal, and to transmit a test clock to the first communication driving circuit unit in order to blink and drive the communication confirmation LED of the RX communication display unit; And
The terminal connection display unit which is triggered when the tester switch circuit unit is switched to the third state to turn on the terminal connection confirmation LED when the terminal device is connected to the terminal port.
LED patch panel analyzer including a.
The method of claim 1,
And the first communication driving circuit unit applies a half-duplex communication chip connected in parallel with a communication line between the switch hub and the terminal device as a receiving circuit.
The method of claim 2,
The half-duplex communication chip is an LED patch panel analyzer which is a communication chip of the RS-485 series.
The method according to claim 2 or 3,
The signal conversion circuit unit is connected in series with the reception signal output terminal (RO) of the parallel communication chip and a filter capacitor (C2) for removing the DC component of the signal output at the TTL (Transistor-Transistor Logic) level, and for the filter An integration capacitor C3 connected in parallel between the capacitor C2 and the ground terminal to integrate the AC component of the signal to generate the signal to be compared;
And the comparison circuit unit includes an OP-AMP receiving the comparison target signal through an inverting terminal and receiving the reference signal through a non-inverting terminal to generate a driving signal of the communication confirmation LED.
delete The method of claim 1,
The first oscillation signal has a frequency of 1Hz, the second oscillation signal has a frequency of 60Hz or more LED patch panel analyzer.
The method of claim 6,
LED patch panel analyzer further comprises a tester unit operation display unit for driving the LED for the tester unit operation display flashing by the first oscillation signal.
The method of claim 1,
The second communication driving circuit unit is an LED patch panel analyzer applying a half-duplex communication chip of the RS-485 series as a transmission circuit.
The method of claim 1,
The clock generation circuit unit receives the second oscillation signal as the second input and outputs an inverted clock to the first NAND gate U103: A, and receives the first oscillation signal as one input and the other input is the tester switch. LED patch panel analyzer including a second NAND gate (U103: B) connected to the VCC power supply when the circuit portion is switched to the second state and connected to the ground side when the tester switch circuit portion is switched to the third state. .

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