JPS6179357A - Leased circuit connecting device - Google Patents

Abstract

PURPOSE:To improve the utilizing efficiency of a leased circuit so as to reduce the cost of equipment, by providing a changeover relay which can connect the transmission line side four-wire system part of an exchange with the exchange side and leased line terminal side by switching and connecting a vacantly rotating transmission line side four-wire system part with the leased line terminal side by switching. CONSTITUTION:When a leased line terminal 5 wants to talk with the leased line terminal 5 of a partner station, a switch 7 is turned on by means of a request from the leased line terminal 5. When the switch 7 is turned on, a vacant circuit detecting circuit 8 connects transmission sides of a vacantly rotating transmitting circuit 4WS and receiving circuit 4WR to the leased line terminal 5 side by switching and informs its exchange side that the said circuit is busy by supplying the earth. At the partner station side, the transmission line sides of the receiving circuit 4WR and transmitting circuit 4SW are connected with its leased line terminal 5 by switching and informs its exchange side that the circuit is busy.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a leased line connection device, and more particularly to a device that makes effective use of a line by making a leased line connection using a switched line.

Prior Art Conventionally, leased lines and switched lines are completely different lines. Exchange lines are connected between exchanges and other exchanges, and terminals (telephones, fax terminals, etc.) connected to each exchange are V-connected via the respective exchanges and exchange lines. A dedicated line is configured by directly connecting both terminals with a transmission path. FIG. 3 is a block diagram showing an example of a conventional connection between a dedicated line and a switched line. The leased line directly connects the leased line terminals 5, and the switched line connects any subscriber terminal 11:1 through the exchange 2 connected to both ends. Connecting.

The conventional leased line connection system described above has the disadvantage that a large number of lines are required in total because the leased line terminals are connected through a channel separate from the switched line. In particular, dedicated lines for configuring conference calls and the like are infrequently used, and therefore the line usage efficiency is poor. It is possible to connect conference telephones for NUN communication using switched lines, but since the terminal side of the exchange has a two-wire configuration, connecting multiple terminals is likely to cause ringing and slow calls. Therefore, it is desirable to connect using a 4-wire dedicated line.

OBJECTS OF THE INVENTION It is an object of the present invention to solve the above-mentioned conventional drawbacks and to provide a dedicated line connection device that is capable of making a dedicated line connection by utilizing the vacant space of an exchange line, thereby increasing the efficiency of line usage. At the same time, the objective is to reduce equipment costs for transmission lines.

Composition of the Invention The leased line connection device of the present invention includes a switching relay for switching and connecting a four-wire line connected to an exchange to a leased line terminal, and a switching relay for switching and connecting a four-wire line connected to an exchange to a leased line terminal, and monitoring a control signal of the exchange to determine whether the four-wire line is idle. It has a built-in idle line detection circuit that detects idle lines, and switches and connects idle lines to leased line terminals as needed, displays the line usage status to the exchange, and sends a line setting signal to the other party. The present invention is characterized by comprising a line setting detection circuit which operates a switching relay to switch and connect the line to a leased line terminal when a line setting signal from the station is detected, and displays the line usage status to the exchange.

Embodiments of the Invention Next, the present invention will be described in detail with reference to the drawings.

FIG. 1 is a block diagram showing one embodiment of the present invention.

That is, the dedicated line setting circuit 6 is connected between the exchange@2 and the transport multiplexing device 3, and the dedicated line setting circuit 6 is connected to the exchange Ja2.
A leased line can be set up by monitoring the control signal of and connecting the idle line to the leased line terminal 5. Looking at it from a different perspective, when the leased line is empty, it can be used as a switched line. Therefore, this embodiment has the effect of improving line usage efficiency and reducing the overall number of lines required.

FIG. 2 is a circuit diagram showing details of the dedicated line setting circuit 6 and the like of this embodiment. That is, the leased line setting circuit 6 is connected between the exchange 2 and the carrier multiplexer 3, and the idle line detection circuit 8
The control signal at the signal transmission line entrance is monitored to detect an idle line. Since the signal transmission line port and RG are grounded when the switched line is in use and open when it is idle, it is possible to easily detect an idle line. Furthermore, there are multiple lines connecting the exchange 2 and the transport multiplexer 3.

It is extremely rare that all lines are used, and there is usually at least one idle line. The idle line detection circuit 8 constantly detects the idle line.

When the leased line terminal 5 wishes to talk to the leased line terminal 5 of the partner station, the switch 7 is turned on in response to a request from the leased line terminal 5. When the switch 7 is turned on, the idle line detection circuit 8 operates, for example, the relay RLI and switches its switching contact r"'+1.
Switch and connect the transmission line sides of the empty transmission line 4WS and reception line 4WR to the leased line terminal 5 side, and connect the contact rl"1
” is turned on, supply air to the exchange side and indicate that the line is in use. At the same time, switching contact T1□
' is switched to the line setting circuit 9 side, and the line setting circuit 9 sends a line setting signal to the partner station.

On the partner station side, the -I- signal is output to the signal transmission line RG. Then, when the line setting detection circuit IO receives the above signal, it operates the relay RL1 and its contact r1□
, switch the transmission line side of the receiving line 4WR and the sending line 4WS to the leased line terminal 5, and connect the contact rl-1.
' is turned on to indicate to the exchange that the line is in use.

Therefore, the dedicated line terminals 5 are connected to each other by the line and used as a dedicated line. During this time, the line is not captured by the exchange. When the use as a dedicated line is finished, by turning off the switch 7, the relay RL1 etc. are restored and the line is used as a switched line.

Effects of the Invention As described above, in the present invention, a switching relay is provided that can switch and connect the 4-wire part on the transmission line side of the exchange to the exchange side and the leased line terminal side. Since the configuration is configured to monitor the control signal of the idle line, detect an idle line, and switch the connection to the 4-wire terminal on the transmission line side of the idle line, it is possible to use the 4-wire line on rare occasions such as conference calls. It is possible to connect a dedicated line as needed without setting up a dedicated line that is rarely used in advance. Therefore, there is an effect that the usage efficiency of the line can be improved and the equipment cost can be reduced.

[Brief explanation of drawings]

Fig. 1 is a block diagram showing one embodiment of the present invention, Fig. 2 is a circuit diagram showing details of the leased line setting circuit, etc. of the embodiment described above, and Fig. 3 is a circuit diagram showing details of the leased line setting circuit, etc. of the conventional leased line and switched line. FIG. 2 is a block diagram showing a connection method. In the figure, l: subscriber terminal, 2: exchange, 3: @transmission/multiplexer, 4: propagation path, 5: leased line terminal, 6: leased line setting circuit, 7: switch, 8: idle line detection circuit, 9: Line setting circuit, 10: Line setting detection circuit.

Claims (1)

[Claims] It has a built-in switching relay for switching and connecting the 4-wire line connected to the exchange to the leased line terminal, and an empty line detection circuit that monitors the control signal of the exchange and detects the idle state of the 4-wire line, as required. A dedicated line setting circuit that switches and connects the idle line to the leased line terminal according to the situation, displays the line usage status to the exchange, and sends a line setting signal to the other station, and a switching relay when it detects a line setting signal from the other station. 1. A leased line connection device comprising: a line setting detection circuit that switches and connects the line to a leased line terminal by operating the switch, and displays a line usage status to an exchange.