JPH0410284B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a method for switching non-telephone digital lines without momentary interruption.

Problems to be Solved by the Invention When switching non-telephone lines, if the method of simply making multiple connections and switching is used, as with conventional telephone lines, the impedance of the line changes suddenly, causing error bits in the digital signal. There is a risk that this may occur.

Therefore, to prevent this from happening, the following new switching method has been developed.

New switching method (Fig. 6) (1) Multi-connect the switching core wire 20, which has a low resistance 12 and a high resistance 22 inserted in series, to the current core wire 10.

(2) Cut the current core wire 10 at the switching point 14.

(3) At the same time as decreasing the value of the high resistance 22, increasing the value of the low resistance 12. In this way, the flow of the transmission signal is changed from the working core wire 10 to the switching core wire 2.
0 without causing a code error.

(4) After that, the current core wire 10 and the switching core wire 20 are connected, and each of the resistors 12 and 22 is removed to complete the switching.

By the way, in order to carry out the above construction method, it is necessary to connect and disconnect one core wire at many points, and as the number of core wires increases, the work becomes more difficult.

This invention enables the above-mentioned switching method to be carried out efficiently by using the following connectors which have already been announced.

Connector used (see Japanese Patent Application Laid-Open No. 57-194466) 30 in FIG. 7 is the entire connector.

Inside the main body 32, there is a U-shaped metal fitting 34 as shown in FIG.
are buried therein, and the tips of the opposing upright pieces protrude above the upper surface of the main body, and a groove 40 for inserting the core wire is provided in that portion to form the contacts 36, 38. When the core wire with the sheath still attached is pushed into this groove 40, the sheath is torn and the core wire conductor is connected to the contact.

The main body 32 is also provided with a hole 42 that reaches the U-shaped fitting 34, and an optional adapter contact piece 44 is inserted into the hole.
By inserting this, it is possible to connect to the U-shaped metal fitting 34.

Note that instead of the adapter contact piece 44, the connector 30
Contact 3 of the same connector 30'
6' (or 38') can also be inserted into the hole 42 and electrically connected to the U-shaped fitting 34.

Measures to solve problems When implementing the above new switching method,
As shown in Fig. 5, (1) both ends of the new switching line 20 are connected to one contact (for example, 38) of the connector 30, and the adapter contact piece 44 to which the high resistance 22 is connected is inserted into the hole 42; Therefore, the switching core wire 20 is connected to the current core wire 10 in multiple ways. (2) The current core wire 10 is cut at the switching point 14, and the resistor 1
After changing the resistance values of 2 and 22, the current core wire 1
0 to the other contact 36 of the connector 30
The resistor 22 is removed by connecting the resistor 22 to the adapter contact piece 44 and pulling out the adapter contact piece 44.

Detailed explanation Only one side of the switch (corresponds to the left half of Figure 6)
I will explain about it. Do the same thing on the other side at the same time.

(1) As shown in FIG. 1, both ends of the low resistance 12 are connected to the current core wire 10 using switching clips 50 and 52.

Also, one end of the high resistance 22 is connected to the current core wire 10 by the switching clip 50, and the other end is connected to the adapter contact piece 44, which is inserted through the hole 42 of the connector 30 and connected to the U-shaped fitting 34. do.

(2) As shown in Figure 2, connect the switching core wire 20 to the connector 30.
Connect to one contact 38 of the. In this way, the switching core wires 20 are connected to the current core wires 10 in multiple ways through the high resistances 22.

(3) As shown in Figure 3, at the switching point 14, the current center line 10
cut.

Then, the resistance value of the high resistance 22 is lowered, and at the same time the resistance value of the low resistance 12 is increased.

(4) Connect point A, which is slightly opposite the switching point 14 from the point where the switching clip 50 was connected, to the contact 36 of the connector 30 (FIG. 4), and cut at point B.

The adapter contact piece 44 is pulled out and the resistors 12, 22 are removed to complete the switching (FIG. 5).

Note that, as described above, another connector 30A is used instead of the adapter contact piece 44, the high resistance 22 is connected to one contact 38, and the other contact 36 is inserted into the hole 42 of the connector 30. You can also do this.

Effects of the invention Utilizing the already announced connector 30,
A new switching method for non-telephone lines can be implemented efficiently.

[Brief explanation of drawings]

Fig. 1, Fig. 2, Fig. 3, Fig. 4, and Fig. 5 are explanatory diagrams showing the method of the present invention in the order of steps, Fig. 6 is an explanatory diagram of the new switching method, and Fig. 7 is an explanatory diagram of the method of the present invention. Figure 8 is an explanatory diagram of the connector used in
4 is an explanatory diagram. 10: Current core wire, 12: Low resistance, 14: Switching point, 20: Switching core wire, 22: High resistance, 30: Connector, 32: Connector body, 34: U-shaped metal fitting,
36, 38: Contact, 40: Groove, 42: Hole,
44: Adapter contact piece.

Claims (1)

[Claims] 1. Multi-connect a switching core wire with a high resistance inserted in series and a low resistance wire to the current core wire, cut the current core wire at the switching point, and reduce the value of the high resistance at the same time. , a method for switching a cable core in which, after increasing the value of the low resistance, the current core wire and the switching core wire are connected and each of the resistors is removed, a U-shaped metal fitting embedded in the main body. The tips of the opposing rising pieces protrude above the top surface of the main body to form a contact, and the main body is provided with a hole that reaches the U-shaped metal fitting, and an arbitrary adapter contact piece is inserted into the hole. Prepare a connector that can be connected to the U-shaped metal fitting, connect both ends of the switching core wire to one contact of the connector, and insert the adapter contact piece to which a high resistance is connected into the hole. In some cases, the switching core wire is multi-connected to the working core wire, the working core wire is cut at the switching point, and each resistance value is changed, and then the working core wire is connected to the other contact of the connector. and removing the resistor by pulling out the adapter contact piece.