JPH04181853A - Dial backup device - Google Patents

Abstract

PURPOSE:To allow one telephone set enough to implement line connection control by providing a changeover switch to select a telephone set to the backup device. CONSTITUTION:When a fault takes place in a private line and it is required to be replaced with a telephone exchange line, a changeover switch 1 is used to connect a telephone set 3 and a 1st telephone exchange line, the telephone set 3 controls the telephone exchange line to be connected to the dial backup device DBU. When the connection is finished, the changeover switch 1 is selected to connect the telephone set 3 and a 2nd telephone exchange line. When the two telephone exchange lines are connected, the two telephone exchange lines are the private line are selected to disconnect the private line and the DBU is connected to the two telephone exchange lines. Thus, the one telephone set is enough to realize the function which has been realized by two telephone sets in a conventional system.

Description

[Detailed Description of the Invention] [Summary] This invention relates to a dial backup device that switches the line to a public line when a dedicated line used for a terminal device fails, and controls two telephone exchange lines by switching one telephone set. In the event of a failure of the dedicated line consisting of 4 wires used for terminal equipment,
The line is connected to the other party's dial backup device by manual dialing from the dedicated line to the two telephone exchange lines 5, and the dial backup device is equipped with a changeover switch to switch the telephone, thereby controlling the line connection to one device. Configure it to work with your phone.

[Industrial application field]

The present invention relates to a dial backup device that switches the line to a public line when a dedicated line used for a terminal device fails.

[Conventional technology]

In terminal devices using communication lines, which have been widely used in recent years, the present invention often uses a dedicated line so that the line can be used at any time.

However, line failures may occur even with dedicated lines, and in such cases, a dial backup device is used and a telephone exchange line is used as an alternative communication path.

Usually, a dedicated line uses four lines, two of which are allocated for transmitting signals and two for receiving signals.

Since two telephone exchange lines are used for one line, two telephone exchange lines must be used to replace one dedicated line.

Therefore, in the conventional dial backup device, two telephone sets are used to control the connection of two telephone exchange lines.

Figure 2 shows a conventional dial backup device (hereinafter referred to as DBU).
(abbreviated as ) is shown below. In the figure, 3-1.3-2
is a telephone device that controls line connection, 2 is a telephone device 3-1.3
- A network control/switching unit that controls line connection and switches between a dedicated line and a telephone exchange line by operating 2, 4 is a dedicated line consisting of 4 lines, and 5 is a telephone consisting of 2 lines. There are two switched lines, and 10 is a DBU that switches between a dedicated line and a telephone exchange line.

FIG. 3 is a diagram explaining the functions of the DBU. In FIG. 3, when there is a fault in the dedicated line connecting two DBUs, terminal device A displays on the display unit that there is a fault in the dedicated line. The user knows from the display that a problem has occurred in the dedicated line, and in order to secure the communication path, call telephone 3 in Figure 2.
-1 to connect to the communication partner's DBU using the first switched telephone line, and then connect to the communication partner's DBU using the second switched telephone line using telephone 3-2. connection,
When two telephone exchange lines are connected, the two telephone exchange lines and the dedicated line are switched, the dedicated line is disconnected, and the DB
Two telephone exchange lines were used to connect the U's. In FIG. 3, ■ indicates a communication path when the dedicated line is connected without a fault, and ■ indicates a communication path when the dedicated line has a fault and is connected by two telephone exchange lines. They had changed from route (■) to route (■).

[Problem to be solved by the invention]

As explained above, the conventional DBU has a problem in that it uses two telephones to control the telephone exchange line.

In view of these points, the present invention provides, in DBU,
It is an object of the present invention to provide a means for controlling two telephone exchange lines by switching one telephone set.

[Means to solve the problem]

The above problem is solved by a dial backup device configured as follows.

FIG. 1 is a block diagram of the present invention.

In the dial backup device 10, which connects and switches the line from the dedicated line 4 to the two-line telephone exchange line 5 by manual dialing to the other party's dial backup device when a dedicated line 4 consisting of four lines used for a terminal device fails. ,
By providing a changeover switch 1 for switching between telephones 3, the configuration is such that line connection control is performed by one telephone.

[For production]

After connecting the first telephone exchange line with the telephone, the changeover switch 1 is used to switch to the second telephone exchange line and connect the line.

C Example] FIG. 1 is a configuration diagram of the present invention.

In the figure, 1 is a changeover switch, and other parts with the same symbols as in FIG. 2 indicate the same parts.

A changeover switch 1 for changing over a telephone set 3 is provided in the DBUIO. When a failure occurs in the dedicated line and it is necessary to switch to the telephone exchange line, the changeover switch l connects the telephone 3 and the first telephone exchange line, the telephone 3 controls the telephone exchange line, Connect to the other party's DBU. When the connection is completed, switch the changeover switch 1 to the telephone 3.
and a second telephone exchange line. When the two telephone exchange lines are connected, the two telephone exchange lines and the dedicated line are switched, the dedicated line is disconnected, and the DBUs are connected to each other using the two telephone exchange lines. In this way, the same functions as conventionally required using two telephones can be realized with one telephone.

[Effects of the Invention] As is clear from the above description, the present invention has the effect that the same functions can be realized with one telephone, whereas conventionally two telephones were used.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram of the present invention, FIG. 2 is a conventional dial backup device, and FIG. 3 is an explanatory diagram of the conventional dial backup device. In the figure, 1 is a changeover switch, 2 is a network control/switching unit, 3.3-1. : 3-2 is a telephone set, 4 is a leased line, 5 is a telephone exchange line, 10 is a dial backup device, Direct installation: Fig. 1 211. rl? 92111.1. . : Dial backup device : Conventional dial backup device Figure 2

Claims (1)

[Claims] When a dedicated line (4) consisting of four wires used for a terminal device fails, the dedicated line (4) is connected to two telephone exchange lines (
5), the dial backup device (which connects and switches the line to the other party's dial backup device by manual dialing)
10) A dial backup device characterized in that line connection control is performed with one telephone set by providing a changeover switch (1) for switching between telephone sets (3).