JPH1127405A - Multi-point connection adaptor for integrated service digital communication network - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a multi-point connection adaptor allowing single branching for integrated service digital communication network. SOLUTION: Terminals TX0, TX1, RX0, and RX1 of terminal side modular jacks 11-18 are connected respectively to terminals TX0, TX1, RX0, and RX1 of a digital service unit(DSU) side modular jack 2. The terminal TX1 of the DSU side modular jack 2 is connected to the terminal TX0 of the DSU side modular jack 2 via a termination resistor 21 and one pole of a 2-pole single throw switch 22. The terminal RX1 of the DSU side modular jack 2 is connected to the terminal RX0 of the DSU side modular jack 2 via a termination resistor 21 and the other pole of the 2-pole single throw switch 22.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ISDN (Integr
For more information on multipoint connection adapters for ated Services Digital Network (Integrated Services Digital Network), please refer to DSU (Digital Service Unit) and T
The present invention relates to a connection device for connecting to an ISDN terminal such as A (Terminal Adapter).

[0002]

2. Description of the Related Art In recent years, with the development of ISDN lines,
Personal computer communication using a DN line and the like are becoming widespread. If this ISDN line is used, the conventional PSTN (Pu
Blic Switch Telephone Network (Public Switched Telephone Network) can transmit a large amount of data at a higher speed than a circuit. After the DSU, up to eight communication devices can be connected, and in the case of 2B channel + D channel, communication can be performed using two devices at the same time. Therefore, a user who may simultaneously use personal computer communication or the like and a telephone, etc.
Moving to SDN line.

[0003]

However, as shown in FIG. 3, the DSU 101 has one RJ11 jack 102 for connecting a telephone line or the like and one RJ45 jack 103 for connecting to a TA. Many are equipped. The RJ11 jack 102 uses a two-wire cable 105 to connect an existing RJ11
Modular jack 104 is connected. When one communication device is used, the communication device is connected to the RJ45 jack 103 by four.
It is connected via a / 8-wire cable 106.

However, in order to connect a plurality of communication devices to the RJ45 jack 103, two RJ45 jacks 107a and 107b, a 4 / 8-wire cable 108 having a modular plug, and a modular plug-type termination resistor 109 Must be connected in accordance with the number of communication devices to which the branch wiring device 110 having the above is connected.

Therefore, every time one communication device increases, the number of branch wiring devices 110 also needs to be increased. As a result, when the number of communication devices is increased, the branch wiring device 1 at the end is used.
At 10, the terminating resistor 109 connected to the RJ45 jack is once removed, and an RJ45 modular plug is inserted. The terminal resistor 109 must be newly connected to the branch wiring device 110 at the end, which is troublesome.

[0006] Also, some communication devices have ISD from the beginning.
Some devices have a built-in terminating resistor on the assumption that they are connected to the N line. Therefore, when a communication device having the terminating resistor 109 is connected to the branch wiring device 110, the terminating resistor 109 of the branch wiring device 110 must be removed.
This was also troublesome.

The present invention has been made in view of such a problem existing in the prior art, and provides a multipoint connection adapter device for an integrated digital communication network which can be easily branched. It is in.

[0008]

In order to achieve the above object, according to the first aspect of the present invention, a first modular jack on a home line terminal side and a plurality of modular jacks connected to the first modular jack are provided. And a second modular jack.

According to a second aspect of the present invention, in the first aspect, a termination resistor is provided. According to a third aspect of the present invention, in the second aspect, a switch for switching on / off of the terminating resistor is provided.

In the embodiments of the invention described below, the “first modular jack” described in the claims or the means for solving the problem corresponds to the DSU-side modular jack 2, and similarly, “a plurality of modular jacks”. The "second modular jack" corresponds to the terminal-side modular jacks 11 to 18,
Similarly, the “switch” corresponds to the two-pole single-throw switch 22.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. As shown in FIG. 1, a multipoint connection adapter device 1 for an integrated digital communication network.
Is composed of a DSU-side modular jack 2, terminal-side modular jacks 11 to 18, a terminating resistor 21 of 100Ω, and a two-pole single-throw switch 22.

The TX0 terminal, the TX1 terminal, the RX0 terminal, and the RX1 terminal of the DSU-side modular jack 2 are connected to the TX0 terminal, the TX1 terminal, the RX0 terminal, and the RX1 terminal of the terminal-side modular jacks 11 to 18, respectively. The TX1 terminal of the DSU-side modular jack 2 is connected to the TX0 terminal of the DSU-side modular jack 2 via a terminating resistor 21 and one of two-pole single-throw switches 22. The RX0 terminal of DSU side modular jack 2
The RX1 terminal of the DSU-side modular jack 2 is connected via the terminating resistor 21 and the other of the two-pole single-throw switch 22. Therefore, the double pole single throw switch 22 is
1 has a role of a switch for enabling and disabling 1.

FIG. 2 is an external view of a multipoint connection adapter device 1 for an integrated digital communication network. In the multipoint connection adapter device 1 for an integrated digital communication network, the DSU-side modular jack 2 is provided on one side surface of the housing 3.
The terminal-side modular jacks 11 to 18 are respectively provided on other side surfaces. Further, the two-pole single-throw switch 22 is provided on the upper surface of the housing 3. Further, the terminating resistor 21 is built in the housing 3.

Next, the operation and effect of this embodiment will be described below.・ DSU on DSU side modular jack 2
Is connected to the terminal side modular jack 1
When TA is connected to 1-18, up to 8 after DSU
Up to communication devices can be connected. For this reason,
Up to eight communication devices can be easily added. Further, even when the communication device is added, it is not necessary to prepare a branch wiring device or the like as in the related art.

Since the terminating resistor 21 is built in the multipoint connection adapter device 1 for the integrated digital communication network via the two-pole single-throw switch 22, even if the communication device is added, the terminating resistor 21 is provided. Without relocating 21
It can be easily added.

When a communication device incorporating the terminating resistor 21 is connected to any of the terminal-side modular jacks 11 to 18, an open / close switch (not shown) for a terminating resistor (not shown) incorporated in the communication device. ) Is turned “OFF” and the two-pole single-throw switch 22 is turned “ON”, so that the terminating resistors 21 after the multipoint connection adapter device 1 for the integrated digital communication network can be made effective.

When a communication device incorporating the terminating resistor 21 is connected to any of the terminal-side modular jacks 11 to 18, the terminating resistor 21 of the communication device is turned "ON" and a two-pole single-throw switch is provided. 22 can also be used with "OFF".

The present embodiment can be embodied with the following modifications. .2 pole single throw switch 22
May be a two pole single throw switch with a built-in LED. With such a configuration, it is possible to determine at a glance whether the terminating resistor 21 is in the “ON” state or the “OFF” state by emitting light from the LED.

[0019]

Since the present invention is configured as described above, it has the following effects. According to the first aspect, up to eight communication terminals can be connected to one DSU.

According to the invention described in claim 2, according to claim 1,
In addition to the effects of the invention described in (1), a communication device or the like can be easily added without removing the terminating resistor. According to the third aspect of the present invention, in addition to the effect of the second aspect of the present invention, by opening and closing a switch, it is possible to set on / off of a terminating resistor, and to a communication terminal incorporating a terminating resistor. Can also respond.

[Brief description of the drawings]

FIG. 1 is a circuit diagram of a multipoint connection adapter device for an integrated digital communication network according to an embodiment.

FIG. 2 is an external view of a multipoint connection adapter device for an integrated digital communication network.

FIG. 3 is an explanatory diagram for explaining a conventional technique.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Multipoint connection adapter apparatus for integrated digital communication networks, 2 ... DSU side modular jack as 1st modular jack, 11-18 ... Terminal side modular jack as a plurality of 2nd modular jacks, 21 ... Terminating resistor,
22. A two-pole single-throw switch as a switch.

Claims (3)

[Claims] 1. A multipoint connection adapter device for an integrated digital communication network, comprising: a first modular jack on a home line terminating device side; and a plurality of second modular jacks connected to the first modular jack. 2. The multipoint connection adapter device for an integrated digital communication network according to claim 1, comprising a terminating resistor. 3. The multipoint connection adapter device for an integrated digital communication network according to claim 2, wherein a switch for switching on / off of the terminating resistor is provided.