JPS581864B2 - Dedicated line connection test equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides for dedicated lines that comply with the various standards of the Telegraph and Telephone Public Corporation, which are housed in distribution frames (hereinafter referred to as MDF), lightning arresters (hereinafter referred to as ARR), etc., to be operated only with a telephone key. This relates to a device that can be easily encountered and performs various tests (capacitance, insulation resistance, conductor resistance, ground resistance, ringing, communication tests, etc.).

Traditionally, dedicated line testing at the local telephone office testing department was carried out by
The following methods are used, but each has its drawbacks.

(1) For lines with PD (withstand voltage 30V1W) inserted,
Transmission of signal voltage (A.C75V) of automatic station line test frame (hereinafter abbreviated as LTF) and line test voltage (DC48V)
), insulation tests, conductor resistance tests, etc. are performed using a low voltage tester, commonly known as a tester.

(2) LTF was developed mainly for testing subscriber telephones, so it does not have functions such as detection for 4W lines. Therefore, to support 4W lines, you must use two LTF seats or install two separately installed special listening amplifiers. We make preparations and respond to each situation, such as whether to use a special listening amplifier or a telephone receiver.

(3) Since the terminal equipment for the leased line is installed in the subscriber's premises, it is necessary to meet and test both the upper and lower terminals, so it is necessary to insert and replace the plug in the MDF or ARR each time. .

Furthermore, even on lines that can be tested using LTF, the time required for round trip between LTF and MDF is added due to plug insertion and replacement.

(4) In most cases, there are multiple locations in charge of testing dedicated lines, and when encountering failures, openings, etc., and during tests, listening is required to monitor the line, so it is necessary for personnel to paste the information on MDF, etc. .

The present invention solves the above-mentioned drawbacks of the prior art, and with a single plug insertion, it is possible to connect to dedicated lines of various standards and to both upper and lower terminals by simply operating a telephone key. The purpose of the present invention is to provide a dedicated line detection test device that can easily handle testing, listening, interruptions, etc., and that simplifies and streamlines the testing and testing of dedicated lines.

This will be explained in detail below using the drawings.

Figure 1 shows the connection relationship between the main device, external power supply, MDF, or ARR.

(b) External power is supplied from a plug for connecting the telephone's private line calling signal power (AC 75V) and call power (DC 48V) to the terminal according to the public corporation D2 standard.

(b) Install two 4-core MDF or ARR plugs for L1 and L2 upper terminals and lower terminals,
One for SL (or 2W line), R for 4W line
One piece was used for L.

(c) The main device incorporates everything described in the related drawings.

Figure 2 shows MDF or ARR plug and 256 (or 25
4) In the connection diagram with the test ammunition or ARR ammunition, by inserting the plug, (a) For the upper terminal direction, the circuit to the test device or the communication circuit is connected.

(b) A listening circuit using a speaker is connected to the lower terminal.

(c) Contacts a1 to a4 are for calls etc. when the plug is inserted.
This was inserted to prevent any impact on the line.

Figures 3a, b, and c show the circuits of the main device, and the corresponding terminals are interconnected.

(1) By inserting the plug into the ammunition, it is possible to listen to a conversation through the speaker without affecting a call in progress.

(2) In the case of encountering a 2W line, etc., No. 1 plug into the applicable test ammunition, etc.

(B) Encounter with the host terminal, etc.A) Relays A and B operate by operating the OUT key,
The upper and lower terminals are separated by the a1, a2, a3, and a4 contacts, and the upper and lower terminals are separated by b1, b2, and b.
It is connected to the circuit of No. 1 circuit tester through the operating contacts and electric key 3 and b4 and the normal contacts d1 and d2.

Further, the lower terminals are connected to the speaker circuit through normal contacts c1, c2, c3, and c4, allowing listening and monitoring.

B) For upper terminals, line capacity, insulation, conductor resistance tests, grounding tests, etc. can be performed by operating the MET key.

In addition, line disconnections, short circuits, grounding, etc. requested by higher-level terminals, higher-level test stations, etc. can be handled by operating the respective electric keys L1E, L2E, and SSHORT.

C) D relay operates by operating the SPK key, and d1,
Operating contacts of d2, g1, g2, g3, g4, g5, g6
, g7, and g8, and are connected to the circuits of the handsets T and R, allowing a telephone conversation.

D) If the terminal is an automatic telephone whose dedicated line is based on the D2 standard, it is possible to talk to the terminal telephone by operating the BATT telephone key.

In this case, the ringing signal to the terminal telephone is
By operating the RING key.

E) If polarity reversal of L1 and L2 is required for the connected line, operate the REV (2W) telephone key.

(b) Encounter with lower terminal, etc. A) Relays A and C operate by operating the IN key, a
1, a2, a3, a4 and c1, c2, c3, c44, the lower terminal side is connected to the test machine side circuit.

In this case, the upper terminal is connected to the speaker circuit through the normal contacts b1, b2, b3, and b4, making it possible to listen and talk.

B) Tests, telephone calls, etc. are the same as in (a) above.

(3) In the case of encountering a 4W line, etc., No. 1 plug S
L, No. 2. Insert the plug into the RL compatible test ammunition.

(b) Operate the OUT or IN key depending on whether the encounter is towards the upper terminal or towards the lower terminal.

The operation of the relay by this operation is similar to that of a 2W line.

(b) G relay operates by operating the TR4W key, and
No. 1 to g8 operating contacts allow No. 1. The transmitting circuit is the No. 1 plug insertion line. A receiving circuit is connected to each of the two plug insertion lines, and a call can be made by operating the SPK telephone key through the operating contacts d1 and d2.

(c) SL, depending on whether it is towards a higher terminal or a lower terminal.
Since it is the opposite of RL, in that case you can respond by operating the REV (4W) electric key.

(d) Line testing is the same as for 2W lines, but
In the case of testing an RL compatible line, the REV (
4W) This is possible by operating the electric key.

(4) About interrupts E (4W
In the case of E and F) the relay operates and its operating contacts b1, b2, b3, b4 and c1, c2, c3,
An interrupt can be made using the normal contact point of c4.

However, to interrupt the 4W line, the TR4W key must also be operated.

In this case, it is also connected to the speaker circuit.

(5) Regarding lamp displays In order to visually display the current operation contents, lamps were set up to light at six points considered to be important.

(6) Others a) A TCO telephone key is used for the purpose of cutting off the transmitting circuit when listening to a call.

b) The transformer, IC, etc. inserted into the speaker circuit were commercially available ones, so their explanation will be omitted.

The device of the present invention has the following advantages over conventional testing and testing methods.

(1) All tests can be performed with just one plug insertion, eliminating the need to prepare or carry other test equipment, and
There is no need to spend time going back and forth between F and F, greatly speeding up the work.

(2) In addition to eliminating the need to prepare substitutes when other test equipment is used for other purposes, each deployed equipment can be used for its original purpose at all times.

(3) Dedicated lines are required to be tested quickly due to their nature, and are efficient because they have functions that meet these requirements.

(4) Required tests can now be performed without affecting terminal equipment or PDs (line protection devices).

[Brief explanation of drawings]

Fig. 1 is a block diagram showing the connection from the main device to the outside, Fig. 2 is a circuit diagram showing the state of plug insertion into the MDF test munition or ARR munition, and Fig. 3 a, b, and c are the invention of the present invention. FIG. 2 is a circuit diagram showing an embodiment of the device.

Claims (1)

[Claims] 1 2 connected to dedicated line storage ammunition with 2W line each
Connect the circuit meter to the upper station side by operating the electric key for the pair of plugs, the circuit meter, the speaker circuit, and the 2W line connected to one of the two pairs of plugs, and connect the circuit meter to the lower station side. A connecting means for connecting a speaker circuit, and a connecting means for connecting a transmitting circuit to a 2W line connected to one of the two pairs of plugs by operating a telephone key, and connecting a receiving circuit to the other 2W line. and a connecting means for connecting a transmitting/receiving circuit to the 2W line connected to one of the two pairs of plugs by operating a telephone key, and is configured to be able to carry out the necessary output tests for the 2W line and 4W line. Line output test equipment.