JPH06350556A - Remote installed device alarm transfer system - Google Patents

Abstract

PURPOSE:To economically monitor an alarm caused by a fault at a remote terminal station without newly performing capital investment by transferring the alarm between a main station and the terminal station through a main signal line in the case of transmission between two points in a small scale network. CONSTITUTION:A PCM signal sent from the main station is converted into a unipolar signal by a reception side bipolar/unipolar converting circuit 1, detected by a high-order group alarm (AIS) detection circuit 2 and inputted to a frame synchronizing circuit 3. In this case, the frame synchronism of the transmission line is taken, an error check circuit 4 and a counter station alarm detection circuit 5 detect transmission line error and step out of synchronism on the main station side, and the signal is separated into (n) channels by a separating circuit 6. On the transmission side, the PCM signals of (n) channels are multiplexed by a multiplexing circuit 7, an OR circuit 8 in a lump sends step out of cynchronization information, transmission line error information and various alarms to an inserting circuit and sends them to the transmission side. Next, the signal is passed through an inserting circuit 10, converted into a bipolar signal by a converting circuit 11 and sent to the main station.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an alarm transfer method, and more particularly to a point-to-point (Point-To-
The present invention relates to an alarm transfer method in Point) transmission.

[0002]

2. Description of the Related Art In the conventional alarm transfer system of this type, individual alarms from a transmission device are collected in an alarm collection device, and an alarm is generated and restored in a main station (monitoring station) by a signal line different from the transmission line. Notifying. Even in small-scale networks, monitoring information is considered important, and notification of collection of monitoring information such as alarms is indispensable along with main signal transmission. A conventional PCM terminal device generally performs main signal transmission, and also displays and outputs alarm information by turning contacts on and off. The collection of the alarm information is performed by a device other than the PCM terminal station device, and the information transmission is also transmitted by another signal line.

[0003]

SUMMARY OF THE INVENTION Conventional PCM described above
In the alarm transfer method in the terminal device, a game alarm (SEND) due to loss of synchronization of the PCM signal received from the opposite device
There are sending and reception of upper group alarm (AIS), and alarm transfer such as alarms by other device monitoring is not performed. It is an object of the present invention to provide a new remote installation device alarm transfer system for economically monitoring an alarm due to some failure at a remote terminal station without newly investing in equipment.

[0004]

According to the alarm transfer system of the present invention, various alarms generated on the receiving side are merged with detection information indicating the result of detection of frame synchronization loss and error check generated on the receiving side of a PCM signal. A batch alarm generation circuit to send and a game alarm (SEN) in the transmission signal frame of the transmission side
D) A game alarm (SEND) insertion circuit for inserting the signal sent from the collective alarm generation circuit into the bit.

[0005]

The present invention will be described below with reference to the drawings. FIG. 1 is a block diagram of an embodiment of the present invention. The PCM signal sent from the main station is the bipolar / receiver side.
It is converted into a unipolar signal by the unipolar (B / U) conversion circuit 1, detected by the upper group alarm (AIS) detection circuit 2 and then input to the frame synchronization circuit 3. Here, the transmission path is frame-synchronized, the transmission path error and SEND (out of synchronization with the main station) are detected by the error check circuit 4 and the station alarm (SEND) detection circuit 5, and then by the PCM signal separation circuit 6. It is separated into n channels. On the other hand, on the transmitting side, after the n-channel PCM signal is multiplexed by the PCM signal multiplexing circuit 7, the OR circuit 8 for collective alarm generation detects the out-of-synchronization information detected by the frame synchronizing circuit 3 on the receiving side. And the transmission path error information detected by the error check circuit 4, and m detected by the in-device monitoring.
Various types of alarms are sent to the game alarm (SEND) insertion circuit 9 at once, inserted into the game alarm bit in the signal frame, and transmitted to the transmitting side. Then, after passing through the error check code insertion circuit 10, a unipolar / bipolar (U / B) conversion circuit 11 converts the signal into a bipolar signal,
Send to main station. Here, since AIS and SEND detected by the terminal station are not failures of the terminal station itself, they are not transmitted as a collective alarm. In addition, all batch alarms are set to non-holding operation, and when the alarm is restored, the batch alarm transmission is stopped. As a result, the function of the SEND alarm (out-of-synchronization in the opposite device) in the conventional system can be expanded, and when some trouble occurs in the opposite device, it is possible to notify the main station of the alarm information indicating the failure. The function expansion of this embodiment is
This can be realized by installing this function only in the terminal station, without depending on the device on the main station side.

[0006]

As described above, according to the present invention,
The SEND bit on the transmission path signal frame can be used to notify that some trouble has occurred in the terminal station at the main station, and the alarm collection device and the alarm transfer line at the terminal station of the small network are not installed. Already
The initial investment in the local system can be reduced, and the construction of the local network can be easily promoted.

[Brief description of drawings]

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

[Explanation of symbols]

 1 Bipolar / unipolar (B / U) conversion circuit 2 Upper group alarm (AIS) detection circuit 3 Frame synchronization circuit 4 Error check circuit 5 In-station alarm (SEND) detection circuit 6 PCM signal separation circuit 7 PCM signal multiplexing circuit 8 OR circuit 9 Game alarm (SEND) insertion circuit 10 Error check code insertion circuit 11 Unipolar / bipolar (U / B) conversion circuit

Claims (2)

[Claims] 1. A batch alarm generation circuit for transmitting together with various detection alarms generated at the receiving side of detection information indicating the result of detection of out-of-frame synchronization and error check generated at the receiving side of a PCM signal, and transmission at the transmitting side. A remote installation device alarm transfer method comprising: a game alarm (SEND) insertion circuit for inserting a signal sent from the collective alarm generation circuit into a game alarm (SEND) bit in a signal frame. 2. The remote installation device alarm transfer system according to claim 1, wherein the collective alarm generation circuit is an OR circuit that outputs an OR signal of the detection information and the various alarms.