JPS63292839A - Multiplexing circuit - Google Patents

Abstract

PURPOSE:To enable plural interface circuits to be used by one data terminal equipment and to form a multiplexing circuit with the number of interface circuits fewer than that of the data terminal equipments, by providing an interface switching circuit having a switch to switch connection between the data terminal equipment and the interface circuit to arbitrary combination. CONSTITUTION:The titled circuit is constituted of the interface switching circuit 2 having the switch to switch the connection of four data terminals 1 and three interface circuits 5-7 to the arbitrary combination, and a switch control circuit 4 which controls the interface circuit 2. The switch control circuit 4 monitors all of the data terminal equipments 1 connected to each of the interface circuits 5-7. And when a call is placed from the data terminal equipment 1 to the interface circuit, the data terminal equipment is connected to the interface circuit by controlling the interface switching circuit 2. And when the interface circuit is connected to another data terminal equipment, the data terminal equipment placing the call later is set at a waiting state, or, it is connected to another interface circuit.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to multiplexing circuits, and more particularly to data communication multiplexing circuits.

[Conventional technology]

The block configuration of a conventional multiplexing circuit is shown in FIG. 2. This multiplexing circuit 10 includes various interface circuits 5.6.7 fixedly connected to a plurality of data terminal devices 1:1.
and a demultiplexing circuit 3 that multiplexes signals from each terminal. In FIG. 2, the interface circuits for four data terminal devices are two first interface circuits 5 and one second interface circuit 6.
and one third interface circuit 7 is shown.

[Problem that the invention seeks to solve]

In the conventional multiplexing circuit described above, there is a 1:1 correspondence between the data terminal device and the interface circuit, so each terminal user can use only one interface circuit for one data terminal device, and the data terminal This method has the disadvantage that it requires as many interface circuits as there are devices.

An object of the present invention is to provide a multiplexing circuit that eliminates such drawbacks.

[Means for solving problems]

The multiplexing circuit of the present invention is located between m interface circuits, n data terminal devices (n>m) and the m interface circuits, and is located between the data terminal devices and the interface circuits. The interface switching circuit includes an interface switching circuit having a switch for switching connections to an arbitrary combination, a switch control circuit for controlling the interface switching circuit, and a demultiplexing circuit for multiplexing data from each of the interface circuits.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of a multiplexing circuit 20 which is an embodiment of the present invention. This multiplexing circuit 20 receives data from three various interface circuits consisting of a first interface circuit 5, a second interface circuit 6, and a third interface circuit 7, and each interface circuit 5, 6.7. The demultiplexing circuit 3 for multiplexing is connected between the four data terminal devices 1 and the interface circuits 5.6.7, and the four data terminal devices 1, the three interface circuits 5, 6.7, and The interface switching circuit 2 includes an interface switching circuit 2 having a switch for switching the connections of the interfaces to an arbitrary combination, and a switch control circuit 4 for controlling the interface switching circuit.

Next, the operation of this embodiment will be explained. Switch control circuit 4
monitors all data terminal equipment 1 connected to each interface circuit 5, 6.7.

If there is a call from one data terminal device 1 to the interface circuit to be controlled, the interface switching circuit 2 is controlled and the interface switching circuit 2 is switched.
connects the data terminal device and the interface circuit, and if the interface circuit is connected to another data terminal device, the data terminal device called later is placed in a waiting state or connected to the other interface circuit.

These controls can be performed by software within the switch control circuit 4.

〔Effect of the invention〕

As explained above, the present invention provides the following advantages: by arbitrarily switching the connection between the data terminal device and the interface circuit,
A plurality of interface circuits can be used in one data terminal device, and a multiplexing circuit can be configured with a smaller number of interface circuits than the data terminal device.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram of an embodiment of a multiplexing circuit according to the present invention, and FIG. 2 is a circuit diagram of a conventional multiplexing circuit. 1...Terminal 2...Interface switching circuit 3...
...Demultiplexing circuit 4...Switch control circuit 5.6.7...Interface circuit 10, 20...Multiplexing circuit Agent Patent attorney Yoshiyuki Iwasa Data ・-- −・・−・・−・・−・−−−−
−−−−−−−−−−−−−−−−−−−One terminal device. Cheer/Momo-Hibiki--bone ■Iφbone・■mortal----1
Zeng-・Fan--Dispute and Shin-・Zeng-- ■Bone tatami-7--
Shin's death bone Hibiki's bone bone bone
0 Multiplexing circuit diagram 1

Claims (1)

[Claims] (1) m interface circuits, located between n data terminal devices (n>m) and the m interface circuits, and connecting the data terminal devices and the interface circuits in any combination; A multiplexing circuit comprising: an interface switching circuit having a switch for switching to the interface switching circuit; a switch control circuit for controlling the interface switching circuit; and a demultiplexing circuit for multiplexing data from each of the interface circuits.