KR19990016131A - Cable connection status measuring device and method - Google Patents

Abstract

end. The technical field to which the invention described in the claims belongs

Technique for measuring cable connection

I. The technical problem to be solved by the invention

The present invention provides an apparatus and method for measuring and connecting a connection state between a modem and a connecting cable.

All. Summary of Solution of the Invention

It is provided at the connection part of the cable and modem to cut off or turn on the application of the predetermined power when the modem and the cable are normally connected, and measure the connection state of the modem and the cable by measuring the cut-off or conduction state. .

la. Important uses of the invention

It can be important for measuring cable connections.

Description

Cable connection status measuring device and method

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cable connection device, and more particularly, to an apparatus and method for measuring a cable connection state in a device for receiving data transmitted from an external network such as a cable modem through a cable. .

The information path from a host such as a high end to a modem such as a home terminal is called downstream (for example, from 54 to 750 MHz band), and the information path from the modem to the high end is upstream. (For example, 5 to 42 MHz band). There are many types of media for information path between the terminal and the network, but coaxial cables are generally used.

1 is a schematic configuration diagram of data communication of a typical cable television network. Referring to FIG. 1, the headend 10, the bidirectional amplifier 12, and the cable modem 14 use coaxial cables as media for transmitting data to each other.

FIG. 2 is a diagram illustrating a cable connection method between a coaxial line and a modem in FIG. 1. Referring to Figure 2, when connecting the cable modem 14 and the coaxial wire is generally used for the F-type connector. In this case, the modem connector 16 of the cable modem 14 is generally connected to the male connector, and the coaxial connector 20 of the coaxial cable is connected to the female connector. This connection makes it difficult for the installer to reliably measure its connection when the modem 14 is first installed, and even if the connection is made correctly, the user may later loosen the connection if he or she touches the connection.

In a typical cable television (CAble TeleVision: CATV) network, there is no effect of ingress noise in the downstream, while noise is likely to occur in the upstream. This means that each terminal, namely modems 14, transmits to high-end 10 with a different frequency spectrum, and noise of 5 ~ 42MHz band among noises generated from home appliances such as dryers, washing machines, and vacuum cleaners used in subscribers' homes. This is because the cable connection between the cable modem 14 and the coaxial cable is loosened. The attenuated noise is amplified by the bidirectional amplifier 12. At this time, when the amplified noise is also introduced from different modems, intermodulation occurs due to different noise signals, and the signal-to-noise ratio is significantly reduced in the headend 10. This interferes with communication between the headend 10 and the cable modem 14.

It is therefore an object of the present invention to provide an apparatus and method for measuring the connection state of a modem and a connection cable.

Another object of the present invention is to provide an apparatus and method for measuring and connecting a connection state of a modem and a connection cable.

In order to achieve the above object, the present invention provides a connection portion between a cable and a modem to block or conduct the application of a predetermined power when the modem and the cable are normally connected, and measure the predetermined power interruption or conduction state. It measures the connection state of the modem and the cable.

1 is a schematic configuration diagram of data communication in a typical cable television network

FIG. 2 is a diagram illustrating a cable connection method between a coaxial line and a modem in FIG. 1.

3 is a configuration circuit diagram of a modem and a cable connection state measurement device according to an embodiment of the present invention;

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description, specific details such as specific components are shown, which are provided to help a more general understanding of the present invention, and it is understood that these specific details may be changed or changed within the scope of the present invention. It is self-evident to those of ordinary knowledge in Esau.

3 is a configuration circuit diagram of a modem and a cable connection state measurement apparatus according to an embodiment of the present invention. 3 includes a control unit 22, a downstream unit 24 for demodulating and processing all information transmitted from the headend 10, an upstream unit 26 for preprocessing for transmitting information from the cable modem 14 to the headend 10, and an upstream frequency band. A diplexer 28 for transmitting or receiving a signal and downstream, a state detector 30 for detecting a connection state between the modem 14 and a coaxial line, a lamp driver 32 for indicating a connection state by an indication of a lamp, The buzzer driving part 34 which informs the connection state by the buzzer sound is shown.

The downstream unit 24 demodulates data of a conventional Quadrature Amplitude Modulation (QAM) method transmitted from the head end 10, extracts only the original signal, and transmits the original signal to the control unit 22, and the upstream unit 26 transmits data from the cable modem 14 to the head end 10. It modulates the function. Diplexer 28 combines a type of high-pass filter and low-pass filter that allow only the frequencies in each band to pass because the downstream and upstream frequency bands are different. to be. The state detector 30 detects a connection state between the cable modem 14 and the coaxial cable. In more detail, the magnetic sensor 21a is provided on the modem connector 16, the magnetic sensor 21b is provided on the coaxial connector 20, and the two magnetic sensors 21a and 21b may contact each other when the two connectors 16 and 20 are missing. Is provided on location. When the two magnetic sensors 21a and 21b come into contact with each other, a predetermined power source Vcc is applied to the state detection unit 30 by magnetic action. The state detector 30 includes a light emitting diode LED1 emitting light when the power is applied, a phototransistor Q1 which is a photoconductor, and a resistor R1 connected between the emitter terminal and the ground terminal of the phototransistor Q1. When the light emitting diode LED1 emits light when a predetermined power is applied, the port transistor Q1 which receives a predetermined DC power to the collector stage conducts the DC power to the ground terminal through the resistor R1. Thus, the output voltage of the emitter terminal of the phototransistor Q1 is It becomes a high level. The controller 22 receives the output voltage of the emitter terminal of the phototransistor Q1 through the port A to detect a connection state between the modem 14 and the coaxial line. If the connection between the modem 14 and the coaxial line is loose and the two magnetic sensors 21a and 21b are separated from each other, the application of the predetermined power supply Vcc to the state detection unit 30 is blocked. Accordingly, light emission of the light emitting diode LED1 that emits light when the power of the state detector 30 is applied is stopped, and the port power transistor Q1 that receives a predetermined DC power to the collector stage is turned off and discharged to the ground terminal through the resistor R1. Will be blocked. Therefore, the output voltage of the emitter terminal of the phototransistor Q1 is at a low level. The controller 22 receives the output voltage of the emitter terminal of the phototransistor Q1 through the port A. When the output voltage is high, the controller 22 determines that the connection is correct, and determines that the connection is incorrect when the output voltage is low. Meanwhile, the light emitting diode LED1 and the phototransistor Q1 may be configured by using a photocoupler in the state detector 30.

Meanwhile, the controller 22 may blink a lamp to inform the installer or the user of the connection state detected through the port A. FIG. In more detail, the controller 22 may output a high or low level signal to the port B when the connection state sensed through the port A is correct. Port B is connected to the input of the lamp driver 32. The lamp driver 32 is connected to the light emitting diode LED2 receiving a predetermined DC power through the resistor R2, the light emitting diode LED2 to the collector stage, the emitter stage is grounded, and the base stage receives the signal applied from the port B through the resistor R3. Receiving transistor Q2. If the signal output from the port B of the controller 22 is in a high level state, the transistor Q2 is turned on so that the light emitting diode LED2 emits light. On the other hand, the capacitor C1 may be formed between the base end and the ground end of the transistor Q2 for noise removal to prevent the light emitting diode LED2 from emitting light due to unwanted noise or the like. Resistor R2 is a brightness adjusting resistor of light emitting diode LED2, and resistor R3 is a base current adjusting resistor of transistor Q2. On the other hand, when the connection is correct, that is, when the high level signal is applied to the port A, the controller 22 controls the high level signal to be applied to the port B so that the user knows that the connection is correct when the LED LED2 emits light. It becomes possible. Alternatively, when the connection is not correct, that is, when the low level signal is applied to the port A, the controller 22 controls the high level signal to be applied to the port B so that the user indicates that the connection is incorrect when the LED LED2 emits light. You can also make it known.

In addition, when the controller 22 detects that the modem 14 and the coaxial cable are incorrectly connected through the port A, the controller 22 may transmit a signal to the high end 10 so that the CATV supplier or the like can know.

In addition, in one embodiment of the present invention, the output signal of the state measuring unit 30 is configured to be output to the port A of the control unit 22. In another embodiment of the present invention, the output signal of the state measuring unit 30 is the input signal of the lamp driver 32. It can also be configured to be applied.

Meanwhile, the controller 22 may use a buzzer sound to inform the installer or the user of the connection state detected through the port A. FIG. In more detail, the controller 22 may output a high or low level signal to the port C when the connection state detected by the port A is correct. Port C is connected to the input of the buzzer driver 34. The buzzer driver 34 is composed of a buzzer 36 which receives a predetermined DC power, a buzzer 36 connected to the collector stage, an emitter stage is grounded, and a base stage of the transistor Q3 which receives a signal applied from the port C through the resistor R4. . If the signal output from the port C of the controller 22 is in a high level state, the transistor Q3 is turned on to drive the buzzer 36 to generate a buzzer sound. On the other hand, the capacitor C2 may be formed between the base end and the ground end of the transistor Q3 for noise removal to prevent the buzzer 36 from being driven by unwanted noise or the like. The resistor R4 is a resistor for adjusting the base current of the transistor Q3. On the other hand, when the connection is not correct, that is, when the low level signal is applied to the port A, the controller 22 controls the high level signal to be applied to the port C so that the user knows that the connection is wrong when a buzzer sounds. It becomes possible.

As described above, the present invention provides a connection portion between a cable and a modem to block or turn on the application of a predetermined power when the modem and the cable are normally connected, and measure the cut-off or conduction state as described above. Since the cable connection is measured, the cable connection can be known.

Claims (8)

In the method for measuring the connection state of the cable of the data transmitting and receiving device for transmitting and receiving data through a cable, Conducting or disconnecting a predetermined power source from the data transmission / reception device and the cable at a connection part of the cable by the presence or absence of normal connection with the transmission / reception device of the cable; Measuring the conduction or disconnection state of the predetermined power source to measure a connection state between the transceiver and the cable. The method of claim 1, The method of measuring the connection state further comprises the step of emitting a predetermined light emitting device when any one of the conduction or cut-off state of the predetermined power source to display the connection state to the outside. The method of claim 1, And generating a predetermined buzzer sound when the predetermined power is cut off to display the connection state to the outside. An apparatus for measuring a connection state of the cable of a modem device for transmitting and receiving data with a network through a predetermined cable, A state measuring unit which conducts or cuts a predetermined power supply at a connection portion between the data transmitting and receiving device and the cable by the presence or absence of normal connection with the transmitting and receiving device of the cable; And a light emitting device driver for emitting a predetermined light emitting device by receiving a predetermined control signal based on one of a state of conducting or blocking a predetermined power source that is turned on or off in the state measuring unit to display the connection state to the outside. Condition measuring device. The method of claim 4, wherein And a control unit configured to receive a predetermined signal according to a conduction or blocking state of a predetermined power source that is turned on or off in the state measuring unit to know the connection state. 6. The state measuring device of claim 5, wherein the control unit applies a predetermined control signal to the light emitting device driving unit in accordance with the conduction or blocking state of the predetermined power source. The apparatus of claim 5, wherein the controller transmits predetermined data according to the connection state to the network. The method of claim 4, wherein And a buzzer generator configured to generate a predetermined buzzer sound when the predetermined power is cut off to display the connection state to the outside.