JPH079453Y2 - Turnout - Google Patents

Description

[Detailed description of the device] [Industrial applications]

The present invention relates to a branching device used for a cable television (CATV) or a local area network (LAN), and particularly to an improvement for easily increasing or decreasing the number of branches.

[Prior art]

FIG. 6 is an explanatory diagram of a conventional communication system. In the figure, 1 is a trunk line, 2 is a station having a communication function, 3
Is a branch line connecting the station 2 to the main line 1 and 4 is the main line 1
A branching device that couples multiple stations together to provide impedance matching to prevent reflections. A terminator 5 is provided at the end of the trunk line 1 to prevent reflection of communication signals. In such a device, the communication route between the stations is in the order of station → branch line → branch device → main line → branch device → branch line → station.

[Problems to be solved by the device]

In such a communication system, there is a case where the location of the connected communication device is frequently changed. In such an application, it is desired to mount a large number of branching devices 4 on the trunk line 1 to prepare for future movement, but since the branching device 4 attenuates the communication signal of the trunk line 1, the number of installable devices is limited. Therefore, there is a problem that it is necessary to perform wiring work every time the layout of the system is changed. In addition to this, there is a problem that communication cannot be performed during the wiring work, and the operation of the communication system is stopped. As a solution to such a problem, the present applicant
Proposed 62-93033 "Branker". In this application, the trunk cable is provided with a trunk connecting unit, and when branching, the branch unit is attached to the trunk connecting unit to connect with the branch cable. However, the configuration of the main line connection unit and the branch unit is complicated,
A simpler structure was desired. The present invention solves such a problem, and an object of the present invention is to provide a branching device that can be coupled to a branch line without causing attenuation to the extent that communication on the trunk line is disturbed.

[Means for Solving the Problems]

The present invention that achieves such an object has the following configuration in a branching device including a trunk line connecting unit inserted in a trunk line cable and a branching unit including a branch circuit and a trunk line short circuit. That is, the main line connection unit includes first and second main line jacks that are independently connected to the main line cable,
One or more jacks for branch lines connected to the branch cable, first and second coupling connectors having a plurality of poles arranged in line symmetry with respect to a symmetry point provided in the trunk connection unit; A resistor is provided that connects the first and second trunk jacks with a resistance value that does not hinder a call placed on the trunk. Then, the first trunk jack is connected to the first pole of the first coupling connector, and the second
Of the main wire jack and the second pole located in line symmetry with the first pole of the second coupling connector. The branch unit includes a circuit that short-circuits the first and second trunk jacks, and a circuit that branches the signal between the first and second trunk jacks and the branch jack. It has 3rd and 4th coupling connectors which have two sets of poles connected with the said 1st and 2nd coupling connector, and the said short circuit and a branch circuit. When the third and fourth coupling connectors are in the positive position, the first and second coupling connectors are connected to the pole of the short circuit, and the third and fourth coupling connectors are in the opposite position ( When the branch unit is rotated 180 degrees in the plane from the positive position), the first and second coupling connectors are connected to the poles of the branch circuit.

[Action]

Each component of the present invention has the following functions. The branch unit is provided with a short circuit and a branch circuit, and the circuit to be operated is determined depending on the mounting position of the main connection unit. When positive, the mains cable carries the signal without loss. In the opposite case, the signal is branched from the trunk cable to the branch cable.

【Example】

The present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of the present invention, in which (A) shows a branching unit 20 and (B) shows a trunk line connecting unit 10. In the figure, the branching device is composed of a main line connecting unit 10 attached to the main line cable 1 and a branching unit 20 attached to the main line connecting unit 10, and shows a state in which the lid of the main line connecting unit 10 is removed. Hereinafter, these details will be described. The casing 11 is made of a metallic material, resin, or the like, has connector mounting holes for the trunk cable 1 and the branch cable 3, and is connected to the ground to shield the inside. The trunk jack 12 is connected to the trunk cable 1 and is an N-type jack connector here. The branch line jack 13 is connected to the branch line cable 3, and is an F-type jack connector here. Two trunk jacks 12 and two branch jacks 13 are provided, and they are distinguished by the subscripts a and b. The outer conductors of the trunk cable 1 and the branch cable 3 are in contact with the housing 11 and connected to the ground. The printed circuit board 14 carries the circuit shown in FIG. 2 and is housed inside the housing 11. The printed board 14 is connected to the central conductors of the trunk jack 12 and the branch jack 13 by soldering. The screw 15 is for screwing the printed circuit board 14 into the housing 11, and also serves to ground the ground of the printed circuit board 14. The coupling connector 16 is a pin connector used when mounting the branch unit 20.
Two poles are provided on the left and right, and they are distinguished by the subscripts a and b. The pin connector 16a corresponds to the first coupling connector CN1 and the pin connector 16b corresponds to the second coupling connector CN2.
A resistor 17 connects between the central conductors of the trunk jacks 12a and 12b and is represented as a resistor R in FIG. The coupling connector 21 is a jack connector used for attaching to the main line connection unit 10 and has 5 poles provided in two rows on the left and right, which are distinguished by the subscripts a and b. The pin connector 21a corresponds to the third coupling connector CN3, and the pin connector 21b corresponds to the fourth coupling connector CN4. The printed circuit board 22 includes a short circuit and a branch circuit shown in FIG. Pin connector 16a and pin connector 16b, and pin connector
21a and the pin connector 21b are provided with poles in left-right line symmetry. Therefore, the branch unit for the trunk line connection unit 10
10 For the mounting state, select either the positive or the negative and select the short circuit or the branch circuit. Here, the branch circuit is a general one, and normally sends and receives a signal via a transformer, and impedance matching is performed to prevent reflection. FIG. 2 is a circuit diagram of the printed circuit board 14. Pin connector
16a and 16b have five pole terminals symmetrically, and are short-circuited between the first poles and grounded together with the third pole. It is open between the second pole. A resistor R is mounted between the fourth poles, and the center conductor of the main cable 1 is connected. The fifth pole is connected to the center conductor of the branch cable 3 and is open between the fifth poles. FIG. 3 is a circuit diagram of the printed circuit board 22. The jack connectors 21a, 21b have five pole terminals symmetrically, and are short-circuited between the first pole and short-circuited between the third poles, and are both grounded. The second pole is short-circuited. This forms the short circuit 22a. A branch circuit 22b is provided between the fourth pole and the fifth pole. The operation of the apparatus thus configured will be described below. Fourth
FIG. 5 is an explanatory diagram when it is used as a branching device and FIG. 5 is not used. Hereinafter, the cases will be described separately. (1) When used as a branch unit Branch unit at the positive position with respect to the main line connection unit 10
Install 20. That is, the pin connector 16a corresponds to the jack connector 21a, and the pin connector 16b corresponds to the jack connector 21a.
21b is connected in a supported state. At this time, the first, second, third, fourth, and fifth poles of the pin connector 16a are connected to the first, second, third, fourth, and fifth poles of the jack connector 21a, respectively. As a result,
The branch circuit 22b is selected for the main cable 1 and operates in the same manner as a conventional branch device. (2) When used as a short circuit A branch unit at the opposite position to the main line connection unit 10.
Install 20. That is, the pin connector 16a corresponds to the jack connector 21b, and the pin connector 16b corresponds to the jack connector 21b.
21a is connected in a supported state. At this time, the first, second, third, fourth and fifth poles of the pin connector 16a are connected to the fifth, 4,3, 2, and 1 poles of the jack connector 21b, respectively. As a result,
The short circuit 22a is selected for the main cable 1 and the resistance R
Is shorted and there is no signal attenuation. That is, the branch circuit 22b is used when the branch cable 3 is used, and the short circuit 22 is used when the branch cable 3 is not used.
Use a. Further, even when the branch unit 20 is detached from the trunk line connection unit 10 when the branch unit 20 is replaced, the trunk line cable 10 is connected via the resistor R, so that communication on the trunk line cable is not hindered.

[Effect of device]

As described above, the present invention has the following practical effects. When the branch cable 3 is no longer needed, the installation state of the branch unit 20 is reversed to be in the same state as when the branch device is removed, and the installation of the branch cable 3 can be dealt with flexibly. During the operation to reverse the mounting state of the branch unit 20,
The branch unit 20 may be disconnected from the main line connection unit 10, but since the resistor R connects the main line cable 1, it does not hinder the communication on the main line cable. When the short circuit 22a and the branch circuit 22b are arranged on the same printed circuit board 22 as in the embodiment, only one board is used, so that the mass production effect is large.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a circuit diagram of a printed circuit board 14, FIG. 3 is a circuit diagram of a printed circuit board 22, and FIG. FIG. 5 is an explanatory diagram when not used. FIG. 6 is an explanatory diagram of a conventional communication system. 10 ... Trunk connection unit, 12 ... Trunk jack, 13 ... Branch jack, 16 ... Coupling connector, 20 ... Branch unit, 22
a ... short circuit, 22b ... branch circuit.

Claims (1)

[Scope of utility model registration request] 1. A branching device comprising a trunk connection unit inserted into a trunk cable and a branch unit having a branch circuit and a trunk short circuit, wherein first and second trunk lines are connected to the trunk cable independently of each other. Jack, one or more branch jacks connected to the branch cable, first and second couplings having a plurality of poles arranged in line symmetry with respect to a point of symmetry provided in the trunk connection unit A connector is provided with a resistance for connecting the first and second trunk jacks with a resistance value that does not hinder a call placed on the trunk, and a first trunk jack and a first coupling connector are provided. A main line connecting unit connecting the second main line jack and the second main line jack and a second pole that is line-symmetrical to the first pole of the second coupling connector; A circuit for short-circuiting between the first and second trunk jacks, a circuit for branching a signal between the first and second trunk jacks and a branch jack, and the first and second coupling connectors Is connected with
A third and fourth mating connector having two sets of poles connected to the short circuit and the branch circuit, the first and second mating connectors having the third and fourth mating connectors in a positive position. So as to connect the poles of the short circuit and the third connector, and when the third and fourth coupling connectors are in the opposite positions, connect the first and second coupling connectors and the poles of the branch circuit. A branch unit characterized by comprising the configured branch unit.