JP2000310659A - Device for testing connection of twisted pair of cable - Google Patents

Abstract

PROBLEM TO BE SOLVED: To verify the connection of twisted pairs of cables for every pair and to detect the breaking of wires in the pair, and a short circuit to another pair, etc. SOLUTION: When a rotary switch 11 is connected to pairs to be inspected, pairs of wires are connected to each other by a clamp connector 15 on the far end sides of the twisted pairs of cables 14, and the pairs of wires are grounded through the LEDs L1-L8 of an LED display part 12 on the near end sides to form closed circuits to pass current to light up the LED L1-L8 corresponding to each wire.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a twisted pair cable connection test apparatus for checking connection, disconnection, and short circuit of a twisted pair cable.

[0002]

2. Description of the Related Art Twisted pair cable connection test equipment
It is used to check the connection, disconnection, and short circuit of twisted pair cables. An example of a conventional device for testing a twisted pair cable is described in Japanese Patent Application Laid-Open No. 09-096656. The LAN tester described in this publication is
A disconnection test, a polarity test, and a simple operation test can be performed. The disconnection test is to test whether each of the transmission pair and the reception pair is disconnected. The polarity test is to test whether the transmission pair and the reception pair have the same polarity. In the simple operation test, a pseudo test of a hub, a PC, or the like is performed by folding a pulse of a transmission pair back to a reception pair.

[0003]

However, the above-described twisted pair cable connection test apparatus has the following problems.

[0004] The first problem is that since a pair for transmission and a pair for reception are separately tested, a short circuit between the pair for transmission and the pair for reception cannot be tested.

A second problem is that the transmission pair and the reception pair are tested, but there is no method for inspecting the wiring of a twisted pair cable in which the wiring is incorrectly wired.

An object of the present invention is to provide a twisted pair cable connection test apparatus which solves the above problems.

[0007]

In the twisted pair cable connection test apparatus according to the present invention, a closed circuit for each test pair is selected by a rotary switch to check the connection of the twisted pair cable for each pair, and at the same time, a disconnection for each test pair. , Detecting a short circuit with another pair.

Further, the present invention forms the closed circuit for each test pair by connecting the paired wires at the far end of the twisted pair cable with a clamp connector and grounding the near end through the LED of the LED display unit. It is characterized by doing.

Further, the present invention is characterized in that an LED blinking drive circuit is provided in the clamp connector, and the LED blinks.

Further, the present invention is characterized in that the LED blinking drive circuit is set so that the blinking intervals of the LED are different.

[0011]

Next, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of a twisted pair cable connection test apparatus according to the present invention.

The twisted pair cable connection test apparatus shown in FIG. 1 is composed of a rotary switch 11, an LED display section 12, an 8-pin modular connector 13, and a clamp connector 15, and a connection between the 8-pin modular connector 13 and the clamp connector 15. A twisted pair cable 14, which is a cable under test, is connected between them.

The twisted pair cable 14 includes eight covered copper wires from a first wire to an eighth wire. The eight copper wires are twisted two by two to form a pair.
The first line and the second line are the first pair, the third line and the sixth line are the second pair, the fourth line and the fifth line are the third pair, and the seventh line and the eighth line are the fourth pair.
Make a pair.

There are two types of commonly used twisted pair cables. One is a straight connection, which connects the same pins such as a first pin to a first pin and a second pin to a second pin of an 8-pin modular connector as shown in FIG. This connection
This is a wiring method used when connecting a PC and a hub.

The other connection is called a cross connection, which is obtained by exchanging the connection between the first pair and the second pair used for communication, and connects the first pin to the third pin, the second pin and the sixth pin. The fourth to eighth pins are the same as the straight connection. This connection is a connection used when connecting a PC to a PC and a hub to a hub.

The rotary switch 11 rotates a portion to be a switch and makes one end of each pair come into contact, so that a current flows from the power supply 16 to the pair.

The LED display unit 12 is equipped with eight LEDs, each of which is connected to the first to eighth twisted pair cables during measurement. The pair of LEDs through which the current has flowed is lit.

The 8-pin modular connector 13 is an ordinary commercially available connector used in a LAN, and is adapted to be fitted with a twisted pair cable 14. The 8-pin modular connector 13 has a contact at a position corresponding to the first to eighth wires of the twisted pair cable 14.
2 and a twisted pair cable 14.

When the clamp connector 15 is fitted to the twisted pair cable 14, a current flows through each pair as a closed circuit.

FIG. 2 is a diagram showing the structure of the rotary switch. The front view shows a state where the switch is connected to one end of each pair of the twisted pair cable. The back view shows that the contacts 1 to 8 are the first of the twisted pair cable.
This shows a state where all the lines from the line to the eighth line are connected.

Next, the operation of the embodiment of the present invention shown in FIG. 1 will be described in detail with reference to FIG.

FIG. 3 is a specific circuit configuration diagram of the twisted pair cable connection test apparatus shown in FIG. The LED display unit 12 is equipped with eight LEDs (L1 to L8), and each of the L1 to L8 has a twisted pair cable 14.
Are connected to the first to eighth lines. The LED blinking drive circuits 19 to 22 are included in the clamp connector 15. The LED blinking drive circuits 19 to 22 are circuits for intermittently flowing the flowing current, and are provided in the same closed circuit.
ED (L1 to L8) blinks.

When the rotary switch 11 is connected to the first wire of the first pair of the twisted pair cable 14, the ground 1
A closed circuit is formed by the 7-rotary switch No. 1 terminal-L1-ground 18, and L1 is turned on.

Further, the first pair of twisted pair cables 14
If the pair is connected properly, ground 17-power supply 16
-Rotary switch No. 1 terminal-8-pin modular connector No. 1 terminal-Twisted pair cable 14-Clamp connector No. 1 terminal-LED blinking drive circuit 19-Clamp connector No. 2 terminal-Twisted pair cable 14-8 pin modular connector No. 2 terminal-L2 L2 illuminates to form a closed circuit with ground 18;

When the first pair and the second pair are short-circuited,
Since the current flows through both the first pair and the second pair, the LED
Will light up four times.

The LED blinking driving circuits 19 to 22 have the function of blinking the LEDs in the closed circuit. Since the LED blinking driving circuits 19 to 22 are set so that the blinking intervals are different, the blinking speed of the LED differs depending on which pair of the far end side the current flows.

When the twisted pair cable 14 is connected straight and is normal without disconnection or short circuit, when the rotary switch 11 is switched to the first pair, L2 blinks because L2 is in the closed circuit. Similarly, when switching to the second pair, L6 flashes, when switching to the third pair, L5 flashes, and when switching to the fourth pair, L8 flashes.

Here, if the first pair and the second pair are completely replaced (when the straight and the cross are wrong), the LED pair blinking circuit 10 is included in the closed circuit when the first pair is tested. , The original second pair blink speed can be found, and it can be found that the flashing speed has been changed.

[0030]

As described above, according to the present invention, a test can be performed for each pair by short-circuiting each pair of twisted pair cables using the clamp connector. Since the combination of twisted pair cables is standardized, a test according to the standard can be performed effectively.

Also, the present invention provides an LE
D The blinking interval is changed, and short-circuiting and incorrect connection can be easily displayed by LED. This is because the LED blinking drive circuits are individually changed and provided.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing an embodiment of a twisted pair cable connection test apparatus according to the present invention.

FIG. 2 is a diagram showing a structure of a rotary switch.

FIG. 3 is a specific circuit configuration diagram of a twisted pair cable connection test device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Rotary switch 12 LED display part 13 8-pin modular connector 14 Twisted pair cable 15 Clamp connector 16 Power supply 17, 18 Ground 19-22 LED blinking drive circuit L1-L8 LED

Claims (6)

[Claims] 1. A closed circuit for each test pair is selected by a rotary switch to check a twisted pair cable connection for each pair, and at the same time, a disconnection for each test pair and a short circuit with another pair are detected. Twisted pair cable connection tester. 2. A pair of twisted pair cables on the far end side are connected to each other by a clamp connector, and
The twisted pair cable connection test device according to claim 1, wherein the closed circuit is formed for each test pair by grounding through an LED of an ED display unit. 3. The twisted pair cable connection test apparatus according to claim 2, wherein an LED blinking drive circuit is provided in the clamp connector, and the LED blinks. 4. The twisted pair cable connection test apparatus according to claim 3, wherein the LED blinking drive circuit is set so that blinking intervals of the LEDs are different. 5. The closed circuit is formed for each test pair by connecting the pair wires at the far end of the twisted pair cable and grounding through the LED at the near end, and the closed circuit is selected by a rotary switch. A twisted pair cable connection test method, wherein the connection of a twisted pair cable is checked for each pair, and the disconnection of each test pair and the short circuit with another pair are detected. 6. The twisted pair cable connection test method according to claim 5, wherein said LED blinks at different intervals for each test pair.