JPH0541757A - Backup system - Google Patents

Abstract

PURPOSE:To enable a terminal to be operated even when a cutoff state is generated at an AC 100V power source supplied to a digital circuit terminating device. CONSTITUTION:The fact that the cutoff state occurs at the AC 100V power source is detected by an AC cutoff detecting circuit 2, and a detection signal is supplied to an internal processing circuit 1 in the digital circuit terminating device 6. The internal processing circuit 1 switches the movable contact (c) of a switch SW1 to the fixed contact (b) side based on the detection signal. Thereby, a power source can be supplied from a backup power unit 5 to the internal processing circuit 1. Also, the power source from the backup power unit 5 can be supplied to the terminal 8 via the internal processing circuit 1 and a metallic line 9.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power source backup system for a digital line terminal device connected to an ISDN by an optical cable subscriber line, and more particularly to a power source for a digital line terminal device and a metallic line for this digital line terminal device. The present invention relates to a backup method of a power supply in a terminal connected by.

[0002]

2. Description of the Related Art Conventionally, in this type of digital line terminating device, during normal operation, power is supplied from a power supply circuit connected to AC 100V. A PBX is connected to the digital line terminating device through a metallic line, and a large number of digital telephones as terminals are connected to the PBX through another metallic line. The digital line terminating device may be directly connected to a terminal such as a digital telephone through a metallic line.

As a backup method when the AC power of this terminal is cut off, power is supplied to the PBX from the digital line terminating device through the metallic line, and the PBX is supplied.
A method in which power is supplied to the terminal from the BX through another metallic line, or a method in which power is directly supplied to the terminal from the digital line terminating device through the metallic line is adopted.

Further, when the AC100V power source connected to the digital line terminating device is cut off, a backup system is adopted in which power is supplied from an externally connected backup power supply device to the digital line terminating device. It had been.

[0005]

However, in the backup method of the conventional example, when the AC 100V power supply is cut off in the digital line terminal and the PBX, the power supply to the terminal is stopped.
There was a problem that it became impossible to make a call using a digital telephone, which is a terminal.

It is an object of the present invention to provide a backup system that enables a terminal to operate even when an AC100V power supply is cut off in a digital line terminal and a PBX.

[0007]

In order to achieve this object, the backup system of the present invention uses a digital line terminating device connected to an AC 100V power source and a backup power supply device, and the digital line terminating device and a metallic wire. The digital line terminator is provided with a terminal to be connected, and a power supply circuit that is connected to the AC100V power source and outputs a power source for the digital line terminator and a power source for the terminal, and the power source circuit. A switch means for switching and supplying a power source and a backup power source supplied from the backup power source device;
AC that detects interruption of 0V power supply and outputs interruption information
A disconnection detection circuit, an internal processing circuit connected to the switch means, the AC disconnection detection circuit, and the metallic wire are provided. When the disconnection information is supplied from the AC disconnection detection circuit, the internal processing circuit is provided. The switch means is switched to the backup power supply side. Note that there is a digital telephone as the terminal.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the backup system of the present invention will be described below with reference to the drawings.

FIG. 1 shows the configuration of the embodiment.

In FIG. 1, the digital line terminal 6 and the terminal 8 such as a digital telephone are provided with external connection terminals 4 and 14 having an I431 interface.
The external connection terminals 4 and 14 are connected to each other through the metallic wire 9. Terminal 8 is internal processing circuit 1
The internal processing circuit 11 is connected to the in-terminal power supply circuit 7 and the external connection terminal 14. The terminal 8 is connected to an AC 100V power source (not shown) and is supplied with the AC 100V power source.

The digital line terminating device 6 has an internal processing circuit 1. The internal processing circuit 1 has an external connection terminal 4, an AC disconnection detection circuit 2, and a movable contact c of a switch SW1.
It is connected to the. The switch SW1 is a switch having one circuit and two contacts, and the fixed contact a is connected to the output side of the power supply circuit 3. The input side of the power supply circuit 3 is supplied with AC100V power from the outside through a power transformer. The fixed contact b is supplied with backup power from an external backup power supply device 5.

Input side of the backup power supply 5 and A
The input side of the C disconnection detection circuit 2 is connected to the primary side of the power transformer, that is, the AC100V power source.

Next, the operation of this configuration will be described.

In normal operation, the movable contact c of the switch SW1 constituting the digital line terminating device 6 is connected to the fixed contact a. In this state, AC10
Power from the power supply circuit 3 connected to the 0V power supply is supplied to the internal processing circuit 1. Further, the power from the power supply circuit 3 is supplied to the intra-terminal power supply circuit 7 through the internal processing circuit 1, the metallic wire 9 and the internal processing circuit 11 of the terminal 8.

At this time, some failure occurs, and AC 100 V of both the digital line terminating device 6 and the terminal 8 is generated.
When the power is cut off, the cutoff state is detected by the AC cutoff detection circuit 2, and a detection signal is supplied to the internal processing circuit 1.

When the detection signal is supplied, the internal processing circuit 1 switches the movable contact c of the switch SW1 to the fixed contact b side. In this connection state, power is supplied from the backup power supply device 5 to the internal processing circuit 1 by the battery, and the power from the battery is supplied through the internal processing circuit 1, the metallic wire 9, and the internal processing circuit 11 of the terminal 8. It is supplied to the power supply circuit 7 in the terminal.

[0017]

As is apparent from the above description, in the backup system of the present invention, when the AC disconnection detection circuit supplies the AC 100V power supply interruption information to the internal processing circuit, the internal processing circuit backs up the switch means. It is designed to switch to the power supply side. For this reason,
Even if the AC100V power supply is cut off, the digital line terminating device and the terminal are supplied with power from the backup power supply device, so that the terminal can be maintained in an operable state.

In particular, when the terminal is a digital telephone of a user's home on an optical subscriber line, the digital telephone can make a call even when the commercial power supply of the user's home is cut off. Is obtained.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of an embodiment of a backup system of the present invention.

[Explanation of symbols]

 1 Internal Processing Circuit 2 AC Disconnection Detection Circuit 3 Power Supply Circuit 5 Backup Power Supply Device 6 Digital Line Termination Device 8 Terminal 9 Metallic Wire SW1 Switch

Claims (2)

[Claims] 1. A digital line terminating device connected to an AC100V power source and a backup power supply device, and a terminal connected to the digital line terminating device through a metallic line, wherein the digital line terminating device is connected to the AC100V power source. A power supply circuit that is connected and outputs a power supply for the digital line terminator and a power supply for the terminal, and a switch that switches and supplies the power supply supplied from this power supply circuit and the backup power supply supplied from the backup power supply device. Means, an AC disconnection detection circuit for detecting interruption of the AC100V power source and outputting interruption information, an internal processing circuit connected to the switch means, the AC disconnection detection circuit and the metallic wire, The internal processing circuit, when the interruption information is supplied from the AC interruption detection circuit, switches the switch. Backup method, wherein the switching means to a backup power supply side. 2. The backup system according to claim 1, wherein the terminal is a digital telephone.