JP3001196B2 - Communication line checker and communication line identification method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to disconnection of a communication line,
Polarity, analog line and digital (hereinafter referred to as ISDN)
By displaying the line identification or the like, and relates to the identification how the checker and communication lines of the communication line the user has to be able to easily discover failure or the like.

[0002]

2. Description of the Related Art Conventionally, this type of line checker can check only the normality and polarity of a communication jack, and there is no simple device for distinguishing between an analog line and an ISDN line.

[0003]

Therefore, there are the following problems.

(A) The normality and polarity up to the modular jack side of the communication line can be confirmed, but the presence / absence and polarity of the disconnection of the communication device cord connected to the communication device terminal cannot be confirmed.

(B) The test equipment for the analog line and the test equipment for the ISDN line are different, and the equipment used differs depending on the line type, which is complicated. Also, the test equipment for the ISDN line was complicated.

[0006] (c) When only one of the devices for the analog line and the ISDN line is provided, the line type cannot be determined only by the device having the device, and a test request is sent to the center of the communication company. It took a lot of time and operation.

An object of the present invention, the above problems were solved, it is to provide identification how the checker and communication lines of the communication line can also easily operated without an expert.

[0008]

SUMMARY OF THE INVENTION A communication line checker according to the present invention comprises a modular cord having two cores connected to a communication line to be tested, and an anti-parallel connection between the two cores. A polarity identification and an analog line identification having two light emitting elements (e.g., light emitting diodes) that emit light of different colors upon application of a first DC voltage that is constantly applied to the analog line. A display unit and a different color when energized by applying a second DC voltage higher than the first DC voltage that is connected in anti-parallel between the two core wires and is constantly applied to the ISDN line. And a display unit for ISDN line identification having two light emitting elements that emit light.

The light-emitting element of the display unit for ISDN line identification may be any element that can emit light when the second DC voltage is applied.

The display unit for ISDN line identification is as follows:
This is connected to two core wires via two zener diodes which exhibit zener characteristics at a voltage higher than the analog line voltage and which are connected in series with opposite polarities .

The modular cord further includes a modular plug at one end for detachably connecting to a modular jack to which a communication line is connected, and a modular cord at the other end for connecting a communication equipment cord for performing a disconnection test. It has a jack.

Further, in the method for identifying a communication line according to the present invention, there is provided an analog line to which a predetermined first DC voltage is applied in normal times, and a second DC voltage higher than the first voltage in normal times. And an analog line light emitting diode that emits light when the first DC voltage is applied, and a second light emitting diode that does not emit light when the first DC voltage is applied. And a light emitting diode for an ISDN line that emits light when a DC voltage is applied. If the light emitting diode for the ISDN line does not emit light when the line under test is connected and the light emitting diode for the analog line emits light, a test is performed. Recognizes that the target is an analog line,
When both the analog line light emitting diode and the ISDN line light emitting diode emit light when the line under test is connected, the test object is identified as the ISDN line.

[0013]

[0014]

FIG. 1 is an external perspective view showing an embodiment of the present invention. In this figure, reference numeral 1 denotes an entire communication line checker, 2 denotes a modular cord, a modular plug 3 is attached to one end, and a modular jack 4 is attached to the other end. Reference numeral 5 denotes a display for polarity identification and analog line identification. Red and green light emitting diodes are connected in anti-parallel. Reference numeral 6 denotes a display for ISDN line identification, in which red and green light emitting diodes are connected in anti-parallel.

FIG. 2 is a circuit diagram showing one embodiment of the present invention, and the same parts as those in FIG. 1 are denoted by the same reference numerals. 2A,
2B is a cord constituting the modular cord 2. The display unit 5 is composed of light emitting diodes 5A and 5B that are connected to each other in opposite polarities and emit light of different colors, for example, red and green when each is energized. The display unit 6 is also composed of light emitting diodes 6A and 6B which are connected in reverse and emit light of different colors. 7
A and 7B are zener diodes which are connected in series with opposite polarities and conduct in the opposite direction when a voltage having a reverse polarity of 50V to 58V is applied.

Next, the operation will be described first with reference to FIGS. In FIG. 3, reference numeral 100 denotes a communication line of an analog line or an ISDN line, and a modular jack 101 to which a modular plug of another device can be inserted / removed is connected to an end.

<In the case of an analog line> A modular plug 3 is inserted into a modular jack 101 connected to a communication line 100 for which normality or polarity is to be determined. When the communication line 100 is an analog line, a voltage of 48 V DC (first DC voltage) is normally applied. Therefore, if the modular jack 101 is normal, the light emitting diode 5A or 5B connected in reverse parallel is connected. DC current flows, and one of the light emitting diodes is turned on.

Since the light emitting diodes 5A and 5B use different light emitting colors such as red and green, the correspondence between the polarity of the communication line 100 and the light emitting colors of the light emitting diodes 5A and 5B is determined in advance. Line 100
Can be determined.

If neither of the light emitting diodes 5A and 5B is turned on, it is determined that an abnormality such as a disconnection has occurred in either the communication line 100 or the modular jack 101.

<In the case of ISDN line> The modular plug 3 is inserted into the modular jack 101 connected to the communication line 100 whose normality or polarity is to be determined. When the communication line 100 is an ISDN line, a voltage of 60 V DC (second DC voltage) is normally applied. The conduction voltage of the Zener diodes 7A and 7B is set to 50V to 58V higher than the applied voltage 48V of the analog line.
In the case of an ISDN line, a current flows through the Zener diode 7A or 7B, and one of the light emitting diodes 6A and 6B is turned on.

Since the light emitting diodes 6A and 6B use different light emitting colors such as red and green, the correspondence between the polarity of the communication line 100 and the light emitting colors of the light emitting diodes 6A and 6B is determined in advance as in the case of the analog line. By determining this, the polarity of the communication line 100 can be determined.

When neither of the light emitting diodes 6A and 6B is turned on, it is determined that an abnormality such as a disconnection has occurred in either the communication line 100 or the modular jack 101.

In the case of an ISDN line, the display unit 5
Operates, but the light emitting diodes 6A and 6B of the display unit 6 determine as described above.

Further, since the polarity can be determined in the display unit 5, whether the light emitting diodes of the display unit 6 have the same color or not.
Alternatively, a non-polar light emitting element with low power consumption may be changed to a simple identification display of the ISDN line.

Next, since the present invention can be used even when the test object is a communication device code, such a case will be described with reference to FIGS. 2 and 4 for reference.

In FIG. 4, reference numeral 200 denotes a communication device code to be checked for disconnection.
01 and 202 are connected.

<In the case of a communication equipment code>
The normality up to the modular jack 101 connected to 0 and the lighting color of the light emitting diodes 5A, 5B or 6A, 6B are confirmed.

The modular plug 3 inserted in the modular jack 101 is removed, and the communication equipment cord whose disconnection or polarity is to be determined between the modular jack 101 connected to the communication line 100 and the modular jack 4 of the checker 1 for the communication line. 200 is a modular plug 201,
02 and connect.

When the communication device code 200 is not broken and the polarity is not inverted, the light emitting diode of the same color as the light emitting color of the light emitting diode 5A, 5B or 6A, 6B confirmed above is lit and confirmed. it can.

When the communication device code 200 has no disconnection and the polarity is inverted, the light emitting diode of a color different from the lighting color of the light emitting diode confirmed above can be confirmed because it is lit.

When the communication device code 200 is disconnected, the light emitting diode is not turned on and it can be determined that the communication device is disconnected.

[0032]

Since the present invention has the above-described configuration,
It has the following advantages.

(A) Not only can the normality and polarity of the modular jack side of the communication line be confirmed, but also the disconnection of the communication device code and the connection status (polarity) between both terminals of the communication device code.
Can be confirmed, the range of the cause of the failure search can be expanded from the modular jack to the communication device code, and the time required for recovery from the failure can be shortened.

(B) For the person who confirms the failure of the communication line, the type of the analog line and the ISDN line can be determined and the failure can be confirmed with one checker, so that the convenience is remarkably improved.

(C) Because of the simple circuit configuration, a small and lightweight design is possible, and anyone can easily carry it.
Excellent portability. Also, no power supply or battery is required.

(D) In the modular system, even a general person who does not have the qualification of a construction supervisor can easily check the line, reduce dispatch of a communication company, and shorten the time required for recovery from a failure.

(E) The explosive demand for ISDN lines is expected to increase in the future, and early failure confirmation can be handled.

[Brief description of the drawings]

FIG. 1 is an external perspective view showing an embodiment of the present invention.

FIG. 2 is a circuit diagram showing one embodiment of the present invention.

FIG. 3 is a diagram for explaining an operation in one embodiment of the present invention.

FIG. 4 is a diagram for explaining another operation in the embodiment of the present invention.

[Description of Signs] 1 Communication line checker 2 Modular code 2A, 2B core wire 3 Modular plug 4 Modular jack 5 Display unit 5A, 5B Light emitting diode 6 Display unit 6A, 6B Light emitting diode 7A, 7B Zener diode 100 Communication line 101 Modular Jack 200 Communication equipment cord 201, 202 Modular plug

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Toshihiko Miyamoto 3-19-2 Nishi-Shinjuku, Shinjuku-ku, Tokyo Within Nippon Telegraph and Telephone Corporation (56) References JP-A-8-125733 (JP, A) 62-103349 (JP, U) 1-91361 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) H04M 1/24 G01R 19/14 G01R 31/02 G01R 31/08 H04L 29/14

Claims (5)

(57) [Claims] 1. A modular cord having two cores connected to a communication line to be tested, and a first cord connected in anti-parallel between the two cores and constantly applied to an analog line. And a display section for polarity identification and analog line identification having two light emitting elements that emit light of different colors when each is energized by applying a DC voltage, and an anti-parallel connection between the two core wires and a digital line. A digital line identification display unit having two light-emitting elements that emit light of different colors when each is energized by applying a second DC voltage higher than the first DC voltage that is constantly applied. A communication line checker characterized by comprising: 2. A modular cord having two cores connected to a communication line to be tested, and a first cord connected in antiparallel between the two cores and constantly applied to an analog line. And a display unit for polarity identification and analog line identification having two light emitting elements that emit light of different colors when each is energized by application of a DC voltage, and a digital line connected to the two core wires and constantly connected to the digital line. The first being applied
A communication line checker comprising: a display unit for identifying a digital line having a light emitting element which emits light when energized by application of a second DC voltage higher than the DC voltage. 3. The display section for digital line identification is connected to two core wires via two zener diodes connected in series with opposite polarities and exhibiting zener characteristics at a voltage higher than the analog line voltage. The communication line checker according to claim 1 or 2, wherein the checker is connected. 4. The modular cord according to claim 1, further comprising a modular plug at one end for detachably connecting to a modular jack to which a communication line is connected, and another end for connecting a communication equipment cord for conducting a disconnection test. 3. The communication line checker according to claim 1, further comprising a modular jack. 5. A method for distinguishing between an analog line to which a predetermined first DC voltage is applied in normal times and a digital line to which a second DC voltage higher than said first voltage is applied in normal times. A light emitting element for an analog line that emits light when the first DC voltage is applied, and a digital light that emits light when a second DC voltage is applied without emitting light when the first DC voltage is applied Using a light emitting element for the line, when the light emitting element for the digital line does not emit light when the circuit under test is connected and the light emitting element for the analog line emits light, it is recognized that the test target is an analog line, and A method for identifying a communication line, wherein when a light-emitting element for an analog line and a light-emitting element for a digital line both emit light when a line under test is connected, the test object is identified as a digital line.