JP3323610B2 - Automatic switching equipment for small offices - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic switching device for small offices, and more particularly to an automatic switching device for small offices in which a voice line is more efficiently used in an inter-exchange system.

[0002]

2. Description of the Related Art Conventionally, an automatic switching device for a small station has been disclosed in FIG.
, A terminal trunk 32 to which subscriber terminals 31 (1 to n) are connected via a voice line L1 and a data line D1, a network 33 in which the terminal trunk is accommodated via a voice line L1, and a network And a trunk 34 between exchanges accommodated in the terminal and having a configuration different from that of the terminal trunk.
(1 to m) and a first and second exchanges E each provided with an exchange CPU 40 for controlling a terminal trunk, a network, and an inter-exchange trunk 34 via a control line PL.
X11 and EX12 are provided.

The inter-exchange trunks 34 of the first and second exchanges EX11 and EX12 each have an inter-exchange data line D.
L, and are connected via a voice line KL between exchanges.

[0004] In the automatic switching device for substations constructed as described above, when a call is made from the subscriber terminal 31 to another subscriber terminal, the exchange CPU 40 calls the subscriber terminal based on the number of the called subscriber terminal. It is determined whether the entered subscriber terminal accommodates its own exchange or another exchange.

[0005] If the called subscriber terminal accommodates its own exchange, the exchange CPU 40 sets the network 3
3 and outputs a paging signal of a service tone trunk (not shown) to the called subscriber terminal. When the called subscriber terminal answers, the exchange CPU 40 controls the network 33 and establishes a communication path with the called subscriber terminal.

On the other hand, if the called subscriber terminal accommodates another exchange, the exchange CPU 40 sets the trunk 34 between the exchanges.
And sends a control command to the inter-exchange data line DL to control the other exchange so that a call signal is generated at the called subscriber terminal of the other exchange. When the called subscriber terminal answers, the exchange CPU 40 controls the network 33 of the own exchange and the other exchanges, and thereby the voice line L1 of the called subscriber terminal and the trunk 3 between the exchanges.
4, the voice line KL, the voice line L1 of the called subscriber terminal, and the voice line KL of the trunk 34 between exchanges are connected to each other to connect a communication path.

[0007] When the call ends, the exchange CPU 40
Controls the network 33 to release the communication path.

[0008]

In this automatic switching equipment for small offices, the trunk 34 between exchanges is generally provided as an optional function of the exchange, and is often a single independent board. Therefore, trunk 34 between exchanges
In the exchanges having different numbers of accommodation stations depending on the system, the number of speech lines KL is not limited to the actual number of communication paths actually required between the exchanges, and is provided on the board as many as possible.

For this reason, in a small inter-exchange system in which the number of subscriber terminals accommodated is small, but the number of communication paths is small such that two exchanges are installed separately, the driver circuit in the audio line of the inter-exchange system board is used. Is wasted, and the efficiency of voice line utilization in the system between exchanges is low.

[0010]

SUMMARY OF THE INVENTION The present invention has been made in consideration of the above-mentioned problems, and an object of the present invention is to provide an automatic switching device for a small station which has a higher use efficiency of a voice line in an inter-exchange system.

[0011]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned disadvantages.
First and second exchanges each having a terminal trunk connected to a subscriber terminal via a voice line and a data line, a network accommodating the terminal trunk, and an exchange CPU for controlling the terminal trunk and the network. A terminal trunk of any of the first and second exchanges is disconnected from the subscriber terminal and used as an inter-exchange trunk, and the inter-exchange trunks are exchanged via an inter-exchange voice line and an inter-exchange command line, respectively. An inter-exchange adapter, the inter-exchange adapter includes a voice interface for interconnecting inter-exchange voice lines and a command interface to which an inter-exchange command line is connected, and a storage circuit for storing commands input from the command interface. , The first and the second by the command stored in the storage circuit. And each comprise an exchange between the adapter CPU for performing a command control between the respective switch CPU provided to the exchange of.

[0012]

In the substation automatic switching apparatus constructed as described above, when a call from a subscriber terminal to another subscriber terminal occurs, the exchange CPU is called according to the number of the called subscriber terminal. Then, it is determined whether the subscriber terminal accommodates the own exchange or another exchange.

If the called subscriber terminal accommodates its own exchange, the exchange CPU controls the network and outputs a calling signal to the called subscriber terminal. When the called subscriber terminal answers, the exchange CPU controls the network and establishes a communication path with the called subscriber terminal.

On the other hand, if the called subscriber terminal accommodates another exchange, the exchange CPU generates a call signal to the called subscriber terminal of the other exchange on the data line of the terminal trunk and the data line of the trunk between the exchanges. To control the other exchanges to send commands.

This command is stored in the storage circuit by the inter-exchange adapter CPU via the command interface of the inter-exchange adapter after communication has been established between the exchange CPU and the network by a communication protocol.

Thereafter, communication is established between the exchange-to-exchange adapter CPU and the other exchange, and the command stored in the storage circuit is sent to the other exchange.

The remote exchange analyzes the transmitted command and controls the network so that a calling signal is generated from the called subscriber terminal. When the called subscriber terminal answers, the exchange CPU controls the network of its own exchange and the other exchanges, and thereby the audio line of the called subscriber terminal, the audio line of the trunk between exchanges, and the telephone line of the called subscriber terminal. A voice line and a voice line of a trunk between exchanges are connected to each other to connect a communication path.

[0018]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an automatic switching device for a small station according to the present invention;

In FIG. 1, the substation automatic switching apparatus includes first and second exchanges EX1 and EX2. The first and second exchanges EX1 and EX2 are subscriber terminals 1 (1 to n).
Controls the terminal trunk 2 connected via the voice line L1 and the data line D1, the network 3 accommodating the terminal trunk via the voice line L1, and the terminal trunk 2 and the network 3 via the control line PL. An exchange CPU 10 is provided.

The first and second exchanges EX1, E
Any terminal trunk among the X2 terminal trunks 2 is separated from the subscriber terminal 1 and separated between the exchanges 2a (1-m).
).

The inter-exchange trunks 2a of the first and second exchanges EX1 and EX2 are connected via an inter-exchange voice line KL and an inter-exchange command line CL, respectively.
1 is connected.

The inter-exchange switch adapter 11 stores a voice interface 12a for connecting the inter-exchange voice lines KL and a command interface 12b to which an inter-exchange command line CL is connected, and a command input from the command interface 12b. Memory circuit (R
AM) 19 and the respective exchanges C provided in the first and second exchanges according to the command stored in the storage circuit 19.
Adapter C between exchanges that performs command control with PU
PU20.

In the substation automatic switching apparatus constructed as described above, when a call is made from the subscriber terminal 1 to another subscriber terminal, the exchange CPU 10 calls the subscriber terminal according to the number of the called subscriber terminal. It is determined whether the entered subscriber terminal accommodates its own exchange or another exchange.

If the called subscriber terminal accommodates its own exchange, the exchange CPU 10
And outputs a paging signal of a service tone trunk (not shown) to the called subscriber terminal. When the called subscriber terminal answers, the exchange CPU 10 controls the network 3 and connects a communication path with the called subscriber terminal.

On the other hand, if the called subscriber terminal accommodates another exchange, the exchange CPU 10 sets the data line D1 of the terminal trunk 2 and the data line C of the inter-exchange trunk 2a.
At L, the other exchange is controlled so that a calling signal is generated at the called subscriber terminal of the other exchange, and a command is transmitted.

This command is stored by the inter-exchange adapter CPU 20 via the command interface 12b of the inter-exchange adapter 11 after communication is established between the exchange CPU 10 and the network 3 by a communication protocol as shown in FIG. It is stored in the circuit 19.

Thereafter, communication is established between the exchange-to-exchange adapter CPU 20 and the other exchange, and the command stored in the storage circuit 19 is sent to the other exchange.

The remote exchange analyzes the transmitted command and controls the network 3 so that a calling signal is generated from the called subscriber terminal. When the called subscriber terminal answers, the exchange CPU 10 controls the network 3 of the own exchange and the other exchanges, and thereby the audio line L1 of the called subscriber terminal, the audio line KL of the trunk 2a between the exchanges, and the called telephone line. Voice line L of subscriber terminal
1. Connect the voice lines KL of the inter-switch trunk 34 to connect the communication paths.

Since the audio line KL is always connected as shown in FIGS. 1 and 2, the above-mentioned operation enables a call.

When the call ends, the exchange CPU 10
Controls the network 3 to release the communication path.

In this operation, transmission and reception of commands between exchanges are performed via the exchange-to-exchange adapter 11 by the above-described method.

In this inter-exchange system, the inter-exchange trunk 2a uses any of the terminal trunks 2 separated from the subscriber terminal 1, so that the inter-exchange trunk and the terminal trunk are different from those in the case where the inter-exchange trunk and the terminal trunk are configured separately. It is not necessary to mount the number of communication paths actually required between the exchanges on the board as much as possible, and it is possible to divert them to each other, reduce the division loss, and improve the utilization efficiency of the voice line.

In addition, the exchange-to-exchange adapter CPU 20 uses the commands stored in the storage circuit 19 to execute the respective exchanges CPU 1 provided in the first and second exchanges EX 1 and EX 2.
Since command control is performed between 0 and 0, control in both directions is easy with the command stored in the storage circuit 19.

In the above example, the case where the exchange-to-exchange adapter is one communication path has been described. However, the CPUs of a plurality of exchange-to-exchange adapters may be integrated into one CPU.

[0035]

As is apparent from the above description, according to the automatic exchange for small stations of the present invention, the efficiency of using the audio line in the system between exchanges can be improved.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of an automatic exchange for small stations according to the present invention.

FIG. 2 is a block diagram showing details of an adapter between exchanges used in the automatic exchange for small stations according to the present invention.

FIG. 3 is a block diagram of a conventional automatic switching device for small stations.

[Explanation of symbols]

 1 ... subscriber terminal 2 ... terminal trunk L1 ... voice line D1 ... data line 3 ... network 2a ... ..Trunk between exchanges 10 Exchange CPUs EX1, EX2... First and second exchanges KL... Voice line CL between exchanges CL. Command line 11: Adapter between exchanges 12a: Voice interface 12b: Command interface 19: Storage circuit 20: Between exchanges Adapter CPU

Claims (1)

(57) [Claims] 1. A subscriber terminal (1) comprises an audio line (L1),
A terminal trunk (2) connected via a data line (D1), a network (3) accommodating the terminal trunk, and an exchange CPU (10) for controlling the terminal trunk and the network are provided. An inter-exchange trunk (2a) including first and second exchanges (EX1, EX2), and disconnecting any terminal trunk among the terminal trunks of the first and second exchanges from the subscriber terminal.
The inter-exchange trunks are respectively used as inter-exchange voice lines (KL) and inter-exchange command lines (C
L), the inter-exchange adapter (11) is connected to the inter-exchange adapter via a voice interface (12a) for interconnecting the inter-exchange voice lines and a command interface (12) to which the inter-exchange command line is connected. 12b), a storage circuit (19) for storing a command input from the command interface,
An exchange-to-exchange adapter CPU for performing command control with each of the exchange CPUs provided in the first and second exchanges in accordance with a command stored in the storage circuit;
(20) An automatic switching device for small offices, each comprising: