JPH0473662B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a system for leading outside lines to testing equipment in a distribution board equipped with relays for switching on and off internal lines and outside lines corresponding to the lines of an automatic exchange. It is.

[Background of the Invention] Conventionally, in order to connect an external line such as a subscriber line to a test equipment, a test lead-in relay compatible with the external line is used, and by selecting the relay, an arbitrary external line is connected to the test equipment. It's on. For this reason, a dedicated pull-in relay is required for test pull-in.
It was uneconomical.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a method for very economically introducing any one external line under test to a test device.

[Summary of the invention]

In order to achieve the above-mentioned object, the present invention utilizes the empty contacts of two lines as one set in this distribution board equipped with relays for switching internal and external lines for each line, and combines relay operation and restoration. This method creates a test pattern for connecting one line to the test equipment.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings. In Figure 1, SUBA,B is a subscriber,
LINEA, B are external lines, LINEa, b are internal lines,
NW is automatic exchange, S, t are relay contacts, TST
indicates the test equipment. Further, FIG. 2 is a diagram showing the operating state of the relay shown in FIG. 1.

First, in Figure 1, the external lines LINEA and B are
A set of two lines is connected to local office lines LINEa and LINEb via relay contacts s and t. As a result, by operating and restoring the S and T relays (not shown), it becomes possible to separate the internal and external lines for subscribers SUBA and B, respectively. In Figure 1, both S and T relays are restored, that is,
Both subscribers SUBA and B are shown in use.

Next, in order to pull subscriber SUBA into the test equipment TST while subscriber SUBB is in use, only the S relay (not shown) needs to be activated.
-LINEA-S-t-TST.

This allows the test equipment TST to test the outside line LINEA and the subscriber SUBA.

Similarly, in order to draw subscriber SUBB into the test equipment, the T relay (not shown) may be activated and the S relay (not shown) restored. Also, when both subscribers SUBA and B are empty,
If both T and S relays (not shown) are in operation, the automatic switch NW and test equipment
Disconnected from TST. However, in Figure 1, 2
Although lines (one set) are shown in the figure, if there are many pairs in the same group that are both in use and empty, the empty lines will be in the same state as during the test, and the all-air lines will become multiple lines. Therefore, lines other than those to be actually tested must be temporarily kept in use, complicating relay control.

Figure 3 shows a solution to the above problem. FIG. 3 will be explained below. Items with the same names as in FIG. 1 have the same functions. SUBC, D is subscriber,
LINEC, D is an outside line, LINEc, d is an internal line, s
0, t0, s1, t1, st, ch are relay contacts. The s0, t0, s1, and t1 relay contacts have the same functions as the s and t relay contacts in FIG. 1, and their explanation will be omitted.

Here, the outside lines LINEA, B and LINEC, D are each set as one set, and the two sets of lines are connected to the test equipment TST by relay contact st, and the outside lines LINEA, B or outside line
The configuration is such that LINEC and D are selected.

For example, while subscriber SUBA,C is using
When connecting subscriber SUBA and external line LINED to test equipment TST while SUBB is empty, that is, S0 and S1 relays (not shown) are being restored and T0 and T1 relays (not shown) are operating. , simply operate the ST and CH relays (not shown). Subscriber SUBD and outside line LINED
is SUDG-LINED-t1-s1-st-ch-
Connected by TST path. As described above, by providing ST and CH relays (not shown), it is possible to easily create a duplex system even if the set is empty and in use.

〔Effect of the invention〕

As explained above, the present invention has the effect that it is economically possible to lead the outside line to the test equipment in this distribution board which is provided with a relay that switches between inside and outside the station corresponding to the line.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing one embodiment of the present invention, FIG. 2 is a diagram showing the operating state of the relay of FIG. 1, and FIG. 3 is a diagram showing another embodiment of the present invention. SUBA~D...Subscriber, LINEA~D...Outside line, LINEa~d...Internal line, NW...Automatic switchboard, TST...Test equipment, s, t, s0, s1,
t0, t1...Relay contacts.

Claims (1)

[Scope of Claims] 1. Opening/closing of an outside line, which consists of two lines connected to a subscriber terminal, and an internal line, which consists of two lines connected to an automatic exchange, and between the outside line and the test equipment. In this distribution board equipped with first and second relays having contacts for opening and closing, the first contact of the first relay is connected between one line of the outside line and one line of the internal line. providing a first contact of the second relay between the other line of the outside line and the other line of the internal line, and between the first contact of the first relay and the test device. a second contact of the second relay is connected, a second contact of the first relay is connected between a first contact of the second relay and the test device, and a second contact of the first relay is connected between the first contact of the second relay and the test device; One and the other are the above-mentioned first,
The second relay is configured to be connectable to the automatic exchange through the first contact and also connectable to the test device through the first and second contacts of the first and second relays, Only when one of the first and second relays is in the first state and the other is in the second state, the first relay
The outside line on the side connected to the first contact of the relay in the state of is drawn into the test apparatus side through the first and second contacts of the first and second relays. Circuit lead-in method.