JPH077248U - Switching tester - Google Patents

Abstract

(57) [Abstract] [Purpose] The present invention improves the efficiency of busy confirmation, line disconnection, and recovery work in a test ammunition during cable switching work, and prevents contact with other lines and accidental disconnection. The purpose is to provide a switching tester. [Construction] The present invention relates to a line input unit 1 to which lines L1 and L2 on the exchange side and lines L1 and L2 on the cable side are connected, and a line on the exchange side and a line on the cable side in series via the line input unit 1. A plurality of line disconnecting units 2 for disconnecting the line on the exchange side, a disconnection completion determining unit 12 for determining whether the disconnection by the line disconnecting unit 2 is completed, and a notification for disconnecting the line on the exchange side. For switching, which includes a melody generating circuit 13 and a core wire contrast section 19 for forming a predetermined loop circuit after switching and detecting a flowing reference current to confirm that the core wire is connected to the corresponding core wire. It is a tester.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a switching tester that automates busy confirmation and circuit cutting work performed by an in-station test ammunition during telephone cable switching work.

[0002]

[Prior art]

 In general, in the partial replacement work of telephone cables, various works are performed at the same time in the station where other exchanges are installed to switch and connect the old and new cables.

[0003] Switching work involves disconnecting the currently used cable once, so confirming that it is not busy before switching and disconnecting the line on the exchange side so as not to affect the exchange. . Furthermore, after switching, the continuity is tested to confirm that there is no switching error.

FIGS. 10 (a) and 10 (b) are a front view and a side view showing the appearance of the test ammunition installed at the demarcation point between the exchange and the cable equipment. Further, FIG. 5 is a cross-sectional view of the test bullet at II of FIG. 10 (a).

This test ammunition is composed of terminal portions A and B and a window portion, and both terminal portions are arranged above and below the test ammunition so as to connect the lines on the cable side and the exchange side. The window portion is configured as shown in FIG. 11, is located in the middle of both terminal portions, and has a built-in disconnection contact corresponding to each terminal.

By inserting the cutting plug of the insulator shown in FIG. 12 into the window, the cable side and the exchange side can be separated.

Several types of test ammunition are used with different arrangements of windows, and FIG. 10 (a) shows an example of the 258 type test ammunition in which four vertical lines are arranged in 25 rows. It has a capacity of 100 lines. FIGS. 13 (a) to 13 (e) show the wire number arrangement of the plug blocks of the 256 type test ammunition (three lines are arranged in 25 rows to accommodate 75 circuits) and the corresponding image with the test ammunition. . 13 (f) and 13 (g) show a 200-inch test ammunition machine (10 vertical lines arranged in 10 rows to accommodate 100 lines), which are used as standard.

Then, in order to confirm that the user is not busy before switching, a device (not shown) is connected to the terminal of the test ammunition, and it is checked whether it is busy or not while monitoring with high impedance.

When not in use, the disconnection plug is inserted into the window corresponding to the terminal, and the exchange side is temporarily disconnected. Normally, when the disconnection of up to 10 circuits is completed, the switching connection operator is instructed to execute the switching operation, and after receiving the report of the completion of the switching operation, another device (not shown) is used to switch the connection point from the test ammunition terminal Conduct wire number confirmation work to confirm that there is continuity.

This wire number confirmation work involves connecting one core wire L1 (L2) of the line to which the worker in the station and the switching connection worker contrast to each other to ground, and after confirming that a loop circuit is formed, On the other hand, the core wire L2 (L1) is again connected to the ground at both ends, and it is confirmed that a loop circuit is formed and a comparison is made. This check is carried out for 10 lines. If the control result is good, pull out the disconnection plug from the test ammunition, connect it to the line on the exchange side, and finish the switching connection work for 10 lines.

[0011]

[Problems to be solved by the device]

 However, in the switching connection work using the test ammunition described above, the work is complicated because one line is checked, and if it is busy when checking, connection and check are repeated many times until the end is confirmed. Need to be repeated. Also, it is troublesome to attach and detach the disconnection plug, and proper management of the plug is also required.

[0012] Furthermore, since a tester clip or the like is applied to the terminal portion, there is a risk of contact with an adjacent terminal, and when inserting a disconnection plug, there is a risk of incorrect insertion due to a wrong wire number. It depends on the skill level of the person, and sufficient reliability cannot be obtained. Therefore, the present invention aims to improve the efficiency of busy confirmation, line disconnection, and recovery work of test ammunition during cable switching work, and provides a switching tester that prevents contact with other lines and accidental disconnection. The purpose is to do.

[0013]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention incorporates a plurality of telephone lines through the test ammunition in a device connected to a test ammunition provided at the demarcation points of the exchange side line and the subscriber side line of the telephone line. The line input unit and the line disconnecting unit that disconnects the exchange side line and the subscriber side line when the telephone line is not busy, and at the same time short-circuits the subscriber side line for a predetermined time, and the subscriber side line. There is provided a switching tester including a disconnection completion determining unit that monitors a line voltage and a core wire comparing unit that sends a reference signal to the telephone line.

[0014]

[Action]

 The switching tester with the above configuration is connected to the test ammunition provided at the demarcation point of the exchange side line and the subscriber side line of the telephone line, and the line input unit allows multiple test ammunition via the test ammunition. The telephone line is taken in and the line disconnecting unit automatically determines whether the call is in progress.If the telephone line is not busy, the exchange side line and the subscriber side line are disconnected, and at the same time, the subscriber side line is short-circuited for a predetermined time. It Then, the disconnection completion judgment unit monitors the line voltage of the subscriber side line, and the core wire comparison unit sends a reference signal to the telephone line, whereby the switching core wires are sequentially selected and the comparison confirmation is performed.

[0015]

【Example】

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

FIG. 1 shows and describes the configuration of a switching tester as an embodiment according to the present invention. This switching tester is roughly divided into a line input unit 1 to which the lines L1 and L2 on the exchange side and the lines L1 and L2 on the cable side are connected, and the line and cable on the exchange side via the line input unit 1. Side disconnection unit 2 which is connected in series to the exchange side line to disconnect the exchange side line, disconnection completion determination unit 12 which determines whether or not disconnection by the line disconnection unit 2 is completed, and exchange side line Melody generating circuit 13 for notifying completion of disconnection of the core, and a core wire contrast unit for detecting a reference current flowing by forming a predetermined loop circuit after switching and confirming that the core wire is connected to the corresponding core wire. And 19.

In the line input section 1, A blocks and B blocks shown in FIGS. 6 and 7 and C, D, and E shown in FIG. 13 corresponding to 258, 256, and 200 type test ammunition. , F, G blocks such as plug blocks are used. However, the F plug block that inputs one line is also used to input the line that has not been switched afterwards due to reasons such as busy during switching.

FIG. 9 shows the configuration of the plug used in this embodiment.

At the tip of this plug, a terminal 41 that comes into contact with the line on the exchange side and a terminal 42 that comes into contact with the line on the cable side are provided. By inserting the tip of the plug into the ammunition window part, the line on the exchange side is inserted. And can be connected in series to the cable side line.

The terminals 41 and 42 are provided with conducting pieces on both sides of the insulator portion, and the conducting pieces at both ends are electrically insulated.

With the inserted plug, a cable core 2 wires (OUT side L1, L2) and a station inner core wire 2 (IN side L1, L2) are measured for each line through the contacts inside the ammunition. Pull the 4-core wire toward the device.

Next, the line disconnecting unit 2 will be described.

Through the line input unit 1, the line on the exchange side and the line on the cable side are connected in series. Switches (photomos relays) 3a and 3b are connected in series with the line to disconnect the line on the exchange side.

Further, a switch (photomos relay) 4 is connected in parallel to the cable side of the switches 3a and 3b to short-circuit the cable side line. Each of the switches 3a, 3b, 4 is connected to the input side of the high input resistance amplifier circuit 5.

Then, the voltage comparison circuit 6 has a voltage between L 1 and L 2 of the line amplified by the high input resistance amplification circuit 5 of the preceding stage and a reference voltage (the voltage when not in use is set: −43 V). And are compared with each other to output an L level (0 V) or H level (12 V) signal.

When the voltage between the lines L1 and L2 becomes lower than −43V (ON hook state of the handset), the output of the voltage comparison circuit 6 becomes an H level signal and the latch circuit (NOR RS / Latch). Set 7.

The output Q of the latch circuit 7 is inverted by the inverter 11 to operate the switches 3a 1 and 3b. When the switches 3a and 3b are operated, the supply of the power supply voltage (-48V) from the exchange is stopped.

At this time, if the terminal system of the telephone or the like has an electrostatic capacity (telephone bell circuit or the like), the exchange side is disconnected in the charging state, and the elastic force of the cable side line passes through the resistors r _{1 to} r _4. Is discharged. Since the discharge route by the resistances r _{1 to} r ₄ has a very high resistance (about 5 MΩ), it takes time to complete the discharge.

In the line disconnection completion determination, which will be described later, a change in line voltage is detected. When all the circuits become 0V (-15V <νab <+ 15V), a chime sound is generated to notify the completion of disconnection, so that the voltage on the cable side becomes 0V instantly in the latch circuit 7. Using the output as a trigger, the monostable multivibrator 10 is operated, the switch 4 is operated, and the lines L1 and L2 are short-circuited for about 5 to 10 ms.

Next, the cutting completion determining unit 12 will be described.

The disconnection completion determination unit 12 is a voltage comparison circuit that proportions the output voltage from the high input resistance amplifier circuit 5 in the line disconnection unit 2 to all the lines of the line input unit 1.

When the line on the exchange side is disconnected by the line disconnecting unit 2, the output voltage of the high input resistance amplifier circuit 5 becomes 0 V (actually within ± 15 V in consideration of noise). If all the lines of 0 become 0V, it can be determined that no line is busy. Then, the melody generating circuit 13 is driven, its output is amplified by the amplifier 14, and the speaker 15 notifies the completion of disconnection of the line on the exchange side.

Since the idle line is not connected to the exchange side, the output of the line disconnecting unit is 0V. Furthermore, since the data line and the dedicated line have been evacuated to other cables in advance, they are free lines, and the output of the line disconnection unit is 0V.

The output of the melody generating circuit 13 is connected to the primary side of a transformer 18 via a monitor level adjusting section 15 and a monitor amplifier 17. The secondary side of this transformer is connected via a capacitor to the terminals of the switches S1 and S2 of the core wire comparison unit 19 and FIG. 2 shows the configuration of the core wire comparison unit.

The core wire comparison unit 19 is connected in parallel to the cable side terminal of the line input unit 1, and the lines S1 to S10 can be selected by the switches S1 and S2. Here, the case where the line 1 is selected is shown.

In this core wire contrast section, switches S1 and S2 for switching each of the lines 1 to 10 to the transformer 18 and the core wire contrast current supply circuit 21, and a core wire for transmitting a reference signal to the reference core wire. A current supply circuit 21 for comparison, a high input resistance amplification circuit 22 for detecting a line empty voltage, and a voltage for comparing the line voltage of the line detected by the high input resistance amplification circuit 22 with a reference voltage (± 15 V). According to the comparison result of the comparison circuit 23 and the voltage comparison circuit 23, when the line voltage is in the disconnection state (± 15 V or less), the power supply control circuit 24 for driving the core wire comparison current supply circuit 21 The core wire reference current supply circuit 21 is connected to the speaker 15 via a reference loop current detection circuit 25 and a buzzer sound generation circuit 26.

The control core wire is grounded by the core wire selection switches L1 and L2.

As described in the prior art, a switching connection operator outside the station connects the corresponding core wire to the earth to select “ground → core wire selection switch → core wire contrast current supply circuit → contrast core. A reference current flows in the loop circuit of "line → ground of the control core wire outside the station". This current is detected by the control loop current detection circuit 25, the buzzer sound generation circuit 26 is driven, and the control completion sound is output from the speaker 18. The operator knows that the switching connection is good by the contrast completion sound.

Further, a power supply circuit (not shown) is provided, and AC100V is converted into direct current of 12V and supplied to each circuit, and the remaining amount of the battery power supply is checked and an alarm is issued.

A switching operation (operation) using the switching tester configured as described above will be described with reference to FIG.

As shown in FIG. 3, usually, when performing a partial switching work of telephone cables, it is necessary to perform a switching connection work of the old and new cables at both ends of the section. Workers are also placed in the test ammunition 33 in the station 31 where the exchange 32 is installed, in addition to the two connection points 34 and 35 in the manholes (or on the utility pole) at both ends of the switching cable. Before switching, the current cable is cut off, so it is necessary to confirm in advance that it is not busy. In addition, it is necessary to disconnect the inside of the line office so that the exchange side will not be affected by cable replacement work. These operations are carried out with test ammunition in the station.

The switching tester of the present embodiment is intended to improve the work efficiency of the test ammunition 33 and prevent contact with other lines and erroneous disconnection, and will be described in accordance with the switching work process. It

First, description will be made with reference to the flowchart of FIG. In order to perform the switching work, the switching tester of this example is installed at the relevant ammunition of the cable to be switched. Then, the adapter cord is set in the ammunition window of the switching core unit (step S1).

As the first step, “busy confirmation” will be described.

First, the AUTO button and the LINE button of the switching tester (not shown) are turned on to start the busy confirmation.

The red lamp is turned on for the 10 drawn lines (step S2). The line voltage of each line is sequentially measured automatically at high impedance (step S3). Then, the line state is judged by comparing the reference voltage (43V) (step S4).

In this determination, if the line voltage is equal to or higher than the reference voltage (NO), the non-busy line detects the voltage of 48 V supplied from the exchange as it is. In this case, it is judged as a non-busy circuit. However, when the voltage is lower than the reference voltage (YES), the busy line has a voltage drop, and when the detected voltage value is 43 V or lower, it is determined that the busy line. In addition, no voltage is detected because open lines and dedicated lines are not connected to the exchange. The line where this voltage is not detected is judged as an idle line.

To check the busy state, a line can be selected with a dial and monitored by a speaker.

“Line disconnection” will be described as the second step.

The switching tester automatically confirms busy and disconnects the line, and waits for the completion chime sound. If necessary, check the monitor speaker.

Next, with respect to the non-busy line having a voltage higher than the reference voltage, the line is automatically disconnected by the semiconductor switch. As a result, the line voltage becomes zero, the red lamp goes out, and the green lamp goes on (step S5). However, line disconnection processing will not be performed for originally unused lines.

Then, in order to discharge the capacitor charging voltage of the terminal, a short circuit is temporarily inserted on the cable side simultaneously with disconnection.

The “completion process” will be described as the third step.

1. It is judged whether the line voltage has become 0V for all lines (step S6). When the line voltage has become 0V for all lines (YES), it is judged as "no busy line" and the chime of completion Sound is emitted (step S7). After confirming the completion, the operator on the manhole side is instructed to switch the cable core wire (step S8). However, if there is a busy line (NO), the operator is instructed to switch the cable core wire except for the busy line (step S9).

As the fourth step, “cord contrast” will be described.

First, after the cable switching is completed, the wire number of the connection core wire is checked (step S10). Next, select the wire number with the CHECK LINE dial and press the L1 button. By operating this button, a DC signal is sent to the ground for each specified core number.

Next, the manhole worker attaches the ground to the L1 core wire of the designated wire number. If the wire numbers on the ammunition side and the manhole side match, the corresponding lamp will light and the confirmation buzzer will sound, and the corresponding lamp will light. Then, press the L2 button and make a similar comparison. Select the switching cores one after another and check the contrast. This buzzer sound is different on lines L1 and L2.

However, if there is a line for which the above-mentioned line disconnection has not been completed because the line is busy, the voltage of the line selected so that the reference signal is not mixed into the line is measured. If the measured voltage is 0 V (approximately ± 10 V or less), the core wire control signal can be transmitted.

Next, the actual switching operation of the switching tester of this embodiment will be described with reference to the flow chart of FIG.

The voltage comparison circuit 23 shown in FIG. 2 compares the line voltage of the line 1 with the reference voltage (± 15 V) (step S11), and determines whether the line voltage of 0 V is disconnected (actually ± 15 V or less). In the case (YES), the power feeding control circuit 24 drives the core wire contrast current supply circuit 21 to send a reference signal to the reference core wire (step S12).

The control core wire is grounded by the core wire selection switches L1 and L2.

As described above, the switching connection worker outside the station connects the corresponding core wire to the ground, and thereby ground → core wire selection switch → core wire contrast current supply circuit → contrast core wire → outside core A ground loop circuit of the control core wire is formed, and a control current flows.

This current is detected by the reference loop current detection circuit 25 (step S 13), and if it is detected (YES), the buzzer sound generation circuit 26 is driven, and the control completion sound is output from the speaker 18 (step S 14). The operator knows that the switching connection is good by this contrast completion sound. However, if the reference current is not detected (NO), a failure can be assumed, and the search operation is performed (step S15).

Then, the comparison is performed for all the lines (step S16), and in this embodiment, the process ends by switching 10 lines.

Next, “line restoration” will be described as the fifth step.

When the LINE button on the main body is turned off, the disconnection is released. Then remove the plug from the ammunition and insert it into the next switching unit.

The telephone cable is switched by the work process described above.

By switching using the switching tester of the present embodiment, as compared with the conventional one-line busy confirmation and line disconnection method by hand, the lines are supplemented automatically by 10 lines and automatically. It is efficient because busy checking and disconnection are performed. Also, since complicated work on the ammunition terminal part is eliminated, contact with other lines can be prevented and reliability is improved.

Further, since disconnection of the line eliminates plug insertion work in the ammunition window, there is no concern about incorrect insertion, and incorrect disconnection can be prevented, and reliability is improved.

The switching tester of this embodiment has a core wire checking function, and the wire number after switching can be confirmed.

Further, the present invention is not limited to the above-described embodiments, and it goes without saying that various modifications and applications can be made without departing from the scope of the invention.

[0072]

[Effects of the Invention] As described in detail above, according to the present invention, it is possible to improve the efficiency of busy confirmation, line disconnection, and recovery work in a test ammunition at the time of cable switching work, and contact with other lines. It is possible to provide a switching tester that prevents accidental disconnection.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of a switching tester as an embodiment according to the present invention.

FIG. 2 is a diagram showing a specific configuration of a core wire contrast section shown in FIG.

FIG. 3 is a schematic diagram for performing a switching operation.

FIG. 4 is a flow chart for explaining a switching operation (operation) using a switching tester as an embodiment according to the present invention.

5 is a cross-sectional view of the test ammunition at I-I of FIG. 10 (a).

FIG. 6 is a diagram showing an appearance of a plug block of block A used in this embodiment.

FIG. 7 is a diagram showing a wire number arrangement of plug blocks of blocks A and B used in this embodiment.

8 is a diagram showing a correspondence image between the wire number arrangement of the blocks A and B shown in FIG. 8 and the test ammunition.

FIG. 9 is a diagram showing a configuration of a plug used in this embodiment.

FIG. 10 is a diagram showing the appearance of a test bullet installed at the demarcation point between the exchange and the cable equipment.

11 is a diagram showing a configuration of a window portion of the test bullet shown in FIG.

FIG. 12 is a diagram showing a configuration of a cutting plug.

13 (a) to 13 (e) are views showing the wire number arrangement of the plug blocks of the 256 type test ammunition and the corresponding image with the test ammunition, and FIGS. 13 (f) and 13 (g) are It is a figure which shows the wire number arrangement | sequence of the plug block of a 200 type test ammunition, and the corresponding image with a test ammunition.

[Explanation of symbols]

1 ... Line input section, 2 ... Line disconnection section, 3a, 3b, 4 ... Switch (photomos relay) 5 ... High input resistance amplifier circuit,
6 ... Voltage comparison circuit, 7 ... Latch circuit, 10 ... Monostable multivibrator, 11 ... Inverter, 12 ... Disconnection completion determination unit, 13 ... Melody generating circuit, 14 ... Amplifier, 15 ...
Speakers, 16 ... Monitor level adjusting section, 17 ... Monitor amplifier, 18 ... Transformer, 19 ... Core wire contrast section.

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Katsuyuki Tanahashi 1-6 Uchiyuki-cho, Chiyoda-ku, Tokyo Nihon Telegraph and Telephone Corporation (72) Hidetoshi Takano 1-1-6 Uchiyuki-cho, Chiyoda-ku, Tokyo Nippon Telegraph and Telephone Corp. (72) Inventor Toshiyuki Ishikawa 1-6, Uchiyuki-cho, Chiyoda-ku, Tokyo Nihon Telegraph and Telephone Corp. (72) Inventor Tadashi Honma 1-6, Uchiyuki-cho, Chiyoda-ku, Tokyo Nihon Telegraph and Telephone Corp. (72) Creator Haruo Toda 1-1-6 Uchisaiwaicho, Chiyoda-ku, Tokyo Nihon Telegraph and Telephone Corp.

Claims (1)

[Scope of utility model registration request] 1. A device for connecting to a test ammunition provided at a demarcation point between a switch side line of a telephone line and a subscriber side line, comprising: a line input section for taking in a plurality of the telephone lines via the test ammunition; A line disconnecting unit that disconnects the exchange side line and the subscriber side line when the telephone line is not busy, and at the same time short-circuits the subscriber side line for a predetermined time, and monitors the line voltage of the subscriber side line. A switching tester comprising: a disconnection completion determination unit; and a core wire comparison unit that sends a comparison signal to the telephone line.