JPH02295329A - Subscriber line housing and exchanging device - Google Patents

Abstract

PURPOSE:To connect a telephone set to a subscriber line in a customer station equipment and to execute the outgoing/incoming call by providing a switching circuit to each subscriber line and switching the connection of the subscriber line to a telephone line circuit by switching the circuit. CONSTITUTION:When a commercial power supply is stopped in the customer station equipment 10 and a total service digital network (ISDN) terminal 11 can not be used, a termination circuit 12 fails to operated normally and a termi nal line circuit 22 in a connecting destination detects out-of-phase. Then, a power supply interruption signal is transmitted to a call control circuit 25. Next, since the call control circuit 25 receives the power supply interruption signal and transmits a switching command to a switching circuit 21, a telephone line circuit 24 is connected to the termination circuit 12. The termination circuit 12 separates the ISDN terminal 11 by the interruption of the commercial power supply and a telephone set 13 is connected to a subscriber line 30. Thus, the telephone set 13 can exchange a call originating signal, selecting signal (dial code) and calling signal directly with the telephone line circuit 24.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a subscriber accommodating switching device accommodating terminals applied to an integrated services digital network (hereinafter referred to as ISDN) based on the CCITT Recommendation I series.

[Conventional technology]

Conventionally, in this type of subscriber accommodating switching device, a terminal line circuit was directly connected to an in-home device serving as an accommodating terminal for each subscriber via a subscriber line. Because ISDN terminals, which are applied to ISDN, consume a large amount of current, they cannot be powered by switching equipment and are powered from commercial power sources. In addition, the ISDN CCI is used between the home equipment and the switching equipment.
[Problem to be solved by the invention] As mentioned above, the conventional subscriber accommodating switching equipment is an I SD
It is configured to accommodate in-home equipment with N terminals directly connected via the subscriber line, and is designed to transmit digital signals that comply with the CCITT Recommendation ■ series.
There was a problem in that when a power outage occurred due to commercial power cut to the in-home equipment, digital signals could not be exchanged and the equipment stopped functioning. An object of the present invention is to provide a subscriber accommodating switching device which solves the above-mentioned problems by configuring the switching device to accommodate a telephone in a customer's home equipment via a direct current circuit of the subscriber line. [Means for Solving the Problems] The subscriber accommodating switching device according to the present invention complies with CCITT Recommendation I.
Integrated Service Digital Network (IS) based on the series
In a subscriber accommodating switching device that accommodates I SDN terminals applied to DN), a switching circuit that directly accommodates and connects subscriber lines and switches and connects the line circuit of the subscriber line when a switching command is received; The subscriber line through the circuit I
A terminal line circuit that is connected to each SDN terminal and processes the line link connection conditions (layer 1 conditions of the I series), detects synchronization of the received signal, and outputs it as a power-off signal; A telephone line circuit that connects one line circuit to process connection conditions with a general-purpose telephone, a telephone line circuit that connects to the terminal line circuit to control layer 1 procedures, and a telephone line circuit that connects to the telephone line circuit to handle call processing of the telephone. and a call control circuit that transmits a switching command to a switching circuit that connects a line that has transmitted a signal when a power-off signal is received from the terminal line circuit.

〔Example〕

Next, the subscriber accommodating switching device of the present invention will be explained with reference to the drawings. FIG. 1 is a functional block diagram showing one embodiment of the present invention. In FIG. 1, a plurality of in-home devices 10 are connected to a switching device 20.
It is accommodated and connected to the subscriber line 30 via the subscriber line 30. The home device 10 includes an ISDN terminal 11, a termination circuit 12, and a general-purpose telephone 13. I SDN terminal 11 is CCITT
Conforms to Recommendation I series. The termination circuit usually has IS
A subscriber line 30 is connected to the DN terminal 11, but due to a power outage due to commercial power interruption, the subscriber line 30 is reconnected from the ISDN terminal 11 to the telephone 13 to form a line circuit with the switching device 20. Telephone 13 is a single shell telephone having a telephone circuit and a handset. It may be an in-home device 10 in which an ISDN terminal 11, a termination circuit 12, and a telephone 13 are integrated. Furthermore, the termination circuit 12' may connect a plurality of ISDN terminals 11 to the in-house bus. The switching circuit 21 is provided and connected to each line circuit of the subscriber line 30, and one side is connected to the terminal line circuit 22 and the other side is connected to the telephone line circuit 24, respectively, by means of relay contacts, for example.

Normally, the terminal line circuit 22 is connected to the ISDN terminal 11 via the termination circuit 12 that accommodates the subscriber line 30, and when the call control circuit 25 receives a switching command, the switching relay is driven and the telephone line circuit 24 is Connected to SDN terminal 11. The terminal line circuit 22 is connected to the termination circuit 12 of the home device 10 via the switching circuit 21 and the subscriber line 30, and sends and receives signals based on the layer 1 connection procedure of the ■ series. When the subscriber line 30 is multiplexed, the terminal line circuit 22 is connected to the subscriber line 30 via a demultiplexing circuit (not shown) for each line separated for each terminal. .

The exchange switch 23 accommodates and connects the terminal line circuit 22 and the telephone line circuit 24, and exchanges and connects the line circuits 22 and 24 under the control of the call control circuit 25.

Telephone line circuit 24 is connected to termination circuit 12 via switching circuit 21 and subscriber β line 30 when switching circuit 21 receives a switching command from call control circuit 25 . The switching command is detected by the terminal line circuit 22 and sent by the call control circuit 25 when the termination circuit 12 and the terminal line circuit 22 are out of synchronization due to digital signal exchange. In the case of switching, if the terminal line 2812 connects the subscriber line 30 to the telephone set 13, the telephone set 13 and the telephone line circuit 24 can directly exchange signals. This signal is an intermittent direct current or/and audio frequency signal, or a signal at an audio frequency.

The call control circuit 25 mainly executes the ISDN layer 2 connection procedure and the connection control of the exchange switch 23 to process the call. Further, when the terminal line circuit 22 receives a power-off signal, the call control circuit 25 sends a switching command to the switching circuit 21. Therefore, when the commercial power supply to the in-home device 10 is interrupted and the ISDN terminal 11 cannot be used, the termination circuit 12 cannot operate normally, and the connected terminal line circuit 22 detects the loss of synchronization and transmits the power-off signal to the call control circuit. Call on the 25th. Next, the call control circuit 25 receives the power-off signal and issues a switching command to the switching circuit 21, so that the telephone line circuit 24 is connected to the termination circuit 12, and the termination circuit 12 connects the ISDN terminal 11 when the commercial power is disconnected. When the telephone set 13 is disconnected and connected to the subscriber line 30, the telephone set 13 directly connects the telephone line circuit 24 with a calling signal,
Can send and receive selection signals (dial codes) and calling signals. The telephone 13 may be connected to a jack only when in use.

In this embodiment, the subscriber line is illustrated as being formed for each line circuit formed by two basic (B) channels (64 Kbps) and one data (D> channel (16 Kbps)) according to the basic connection of ISDN. As explained above, if the subscriber line transmission path is multiplexed and connected to a switching device, it can be applied after the line is separated, and if the power supplies for the subscriber line multiplexing and demultiplexing device and the in-house equipment are separate. , the effect of this embodiment can be realized. When the commercial power supply is restored at the home device, the telephone transmits a special number to the telephone line circuit, and the call control circuit restores the switching circuit. This procedure is performed when the commercial power supply is restored. When the service is restored, the termination circuit detects it and automatically makes a call and dials the call, allowing for automatic recovery.Also,
The restoration procedure can also be proceeded by determining a power restoration signal in advance and transmitting it from the termination circuit to the telephone line circuit.

Although the telephone line circuit has been described as being provided for each subscriber line circuit, it may be economical to connect and deploy one telephone line circuit in common to a plurality of line circuits as shown. In this case, only one of the multiple connected lines is switched to become a valid connection.

〔Effect of the invention〕

As explained above, according to the subscriber accommodating switching device of the present invention, a switching circuit is provided for each subscriber line, and the terminal line circuit determines that the synchronization of the digital code is a disconnection of the commercial power of the in-home equipment. It is configured to transmit as a power-off signal and connect the subscriber line line to the telephone line circuit using the switching circuit, so by connecting the telephone to the subscriber line using the in-home equipment, you can make and receive calls. You can get the effect that you can. 12...Terminal circuit, 13...Telephone,
2o・Old...Replacement 1, 21...Switching circuit, 2
2... terminal line circuit, 24... telephone line circuit, 25... old call control circuit, 30... subscriber line.

Agent: Patent Attorney Susumu Uchihara

[Brief explanation of drawings]

FIG. 1 is a functional block diagram showing an embodiment of the subscriber accommodating switching device of the present invention.

Claims (1)

[Claims] In subscriber accommodation switching equipment that accommodates ISDN terminals applied to integrated services digital networks (ISDN) based on the CCITT Recommendation I series, when subscriber lines are directly accommodated and connected and a switching command is received, the line circuit of the subscriber line A switching circuit connects the subscriber line to each ISDN terminal through this switching circuit, processes the link connection conditions of the line (layer I conditions of the I series), and detects synchronization of the received signal. , a terminal line circuit that outputs a power-off signal, a telephone line circuit that connects at least one line circuit via the switching circuit to process connection conditions with a general-purpose telephone, and a layer that connects to the terminal line circuit. 1
A call control unit that controls the procedure and connects to the telephone line circuit to control the call processing of the telephone set, and when receiving a power-off signal from the terminal line circuit, sends a switching command to a switching circuit that connects the line that transmitted the signal. A subscriber accommodating switching device characterized by having a control circuit.