JP2776676B2 - Line connection device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a line connection device.
In particular, the present invention relates to a power-off detection function of line connection devices facing each other.

[0002]

2. Description of the Related Art As shown in FIG. 3, a conventional line connection device is connected to a code item line and converts a bipolar signal from a network into a unipolar signal into a B / U converter 52, and a code from a connection destination or a network. A code detecting unit 54 having a built-in line disconnection code detecting unit 56 for detecting line disconnection, an interface unit 62 for exchanging a detected code (data) with a terminal device, and detecting an abnormality after code detection. An alarm detector 59; a display 64 for displaying information of the interface 62 and the alarm detector 59; a code transmitter 57 for encoding output signals from the interface 62 and the alarm detector 59; A U / B converter 53 for converting the signal into a bipolar signal.

In the above configuration, for example, a line (LI)
When the line of NE3 is disconnected, the line connection device 1 determines that the network is disconnected, and sends a line disconnection code to the line connection device 1 via LINE4. In the line connection device 1, as shown in FIG. 3, the line disconnection code detection unit detects the line disconnection, the alarm detection unit raises an alarm, and the code transmission unit transmits the line disconnection code to the network or the connection destination. The line connection device 1 detects a line disconnection. When the power of the line connection device 2 is turned off, the network similarly determines that the line is disconnected and sends a line disconnection code, and the line connection device 1 detects the line disconnection.

[0004]

As described above, in this conventional line connection device, the line connection is determined by the network when the line connection device 2 and the LINE 3 are both disconnected when viewed from the line connection device 1. In order to send the line disconnection code to the device 1,
In the line connection device 1, there is a problem that it is not possible to distinguish whether the power of the line connection device 2 is simply cut off or the line of the LINE 3 is cut off, and it is not possible to isolate a failure portion.

[0005]

SUMMARY OF THE INVENTION It is an object of the present invention to improve the disadvantages of the prior art and, in particular, to provide a line connection apparatus which can easily identify whether the connection destination is disconnected due to a power failure or a line abnormality. And

[0006]

According to the present invention, a B / U converter connected to a code item line for converting a bipolar signal from a network into a unipolar signal, and detecting a line disconnection by a code from a connection destination or a network. A code detector, an interface for exchanging the detected code (data) with the terminal device, an alarm detector for detecting an abnormality after code detection, and a display for displaying information of the interface and the alarm detector. And a code transmission unit that encodes an output signal from the interface unit and the alarm detection unit, and a U / B conversion unit that converts a unipolar signal into a bipolar signal.

Further, a power-off code detection unit for detecting a power-off code from a connection destination, a power-off detection unit for detecting disconnection of a power switch of a connection destination, and a power-off code only for sending out a power-off code after power-off. It has a configuration that has a capacitor for holding a voltage for a time and a power-off code sending unit for transmitting the power-off to a connection destination. This aims to achieve the above-mentioned object.

[0008]

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

FIG. 1 is a block diagram of one embodiment of the present invention. The embodiment shown in FIG. 1 is a B / U conversion unit 2 connected to a code item line for converting a bipolar signal from a network into a unipolar signal, and a line disconnection detection for detecting a line disconnection based on a code from a connection destination or a network. A code detection unit 4 having a built-in unit 6; an interface unit 12 for exchanging a detected code (data) with a terminal device 13; an alarm detection unit 9 for detecting an abnormality after the code detection; A display section 14 for displaying information of the alarm detection section 9, a code transmission section 7 for encoding an output signal from the interface section 12 and the alarm detection section 9, and a U / B conversion for converting a unipolar signal to a bipolar signal. A part 3 is provided.

The line connection device 1 further includes a power-off code detection unit 5 for detecting a power-off code from a connection destination, a power-off detection unit 10 for detecting a power-off switch 15, and a power-off code even after the power-off. The power supply includes a capacitor 11 for supplying a voltage for a time sufficient to transmit a power-off code, and a power-off code transmitting unit 8 for transmitting the power-off to a connection destination.

Next, the operation will be described. In FIG. 2, when the power switch 15 is turned off in the line connection device 2, the voltage is held for a predetermined time from the capacitor 11 to the power-off detection unit 10 and the code transmission unit 7 even after the power-off.
0 indicates that the power supply of the line connection device has been cut off, and notifies the detection result to the code sending unit 7 including the power cut-off code sending unit 8, and further converts the power cut-off code from a unipolar signal to a bipolar signal by the U / B converter 3. After that, it is transmitted to the line connection device 1 as the connection destination via LINE3, network, and LINE4.

In the line connection device 1, after the B / U converter 2 converts the bipolar signal into a unipolar signal,
The power-off of the line connection device 2 is detected by the power-off code detecting unit 5 in the code detecting unit 4, and the alarm detecting unit 9 is notified. The alarm detection unit 9 notifies the display unit 14, where the line connection device 1 recognizes that the line connection device 2 has been turned off.

When the line is disconnected, a line disconnection code detector 6 is provided.
After detecting the line disconnection code, the alarm detection unit 9 detects an alarm and displays it on the display unit 14. Thereafter, the alarm detection unit 9 notifies the power-off code transmission unit 8 and the power-off code is transmitted to a network or a connection destination.

As described above, it is possible to determine whether the power of the connection destination is disconnected or the line is disconnected.

[0015]

As described above, according to the present invention,
A power disconnection code detection function is provided in addition to the conventional line disconnection code detection, so it is possible to easily determine whether the connection destination is disconnected due to power failure or disconnection due to a line error. It is possible to provide an unprecedented excellent line connection device having an effect that the connection can be easily performed.

[Brief description of the drawings]

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

FIG. 2 is an overall configuration diagram using FIG.

FIG. 3 is a block diagram showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Line connection apparatus 2 B / U conversion part 3 U / B conversion part 4 Code detection part 5 Power cut-off code detection part 6 Line cut-off code detection part 7 Code sending part 8 Power cut-off code sending part 9 Alarm detection part 10 Power cut-off detection Unit 11 Capacitor 12 Interface unit 13 Terminal device 14 Display unit 15 Power switch

Continuation of the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) H04L 29/14 H04L 29/00 H04L 12/48

Claims (1)

(57) [Claims] 1. A B / U conversion unit connected to a code item line and converting a bipolar signal from a network into a unipolar signal.
A code detector for detecting a line disconnection based on a code from a connection destination or a network, an interface for exchanging a detected code with a terminal device, an alarm detector for detecting an abnormality after code detection, and an interface A display unit for displaying information of the alarm detection unit, a code transmission unit for encoding an output signal from the interface unit and the alarm detection unit, and a U / B conversion unit for converting a unipolar signal to a bipolar signal. In the line connection device, a power-off code detecting unit for detecting a power-off code from a connection destination, a power-off detection unit for detecting power-off of a connection destination, and a time period for transmitting the power-off code even after power-off. A line connection device comprising: a capacitor for holding the voltage of the power supply; and a power-off code sending unit for transmitting the power-off to a connection destination.