JP2979955B2 - Order wire communication system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an order wire communication system for performing order wire communication between transmission stations of a transmission system having a route diversity configuration.

[0002]

2. Description of the Related Art In a conventional order wire communication, in the case of a normal transmission system, as shown in FIG.
It has a configuration including a relay station C, and each station A, B, C
Then, the working line a (hereinafter, referred to as a working line) or the protection line b (hereinafter, referred to as a standby line)
, An order wire communication line c is secured in the transmission line, and the branch circuit F protects the order wire. As described above, in order wire communication of a system without the route diversity configuration, order wire protection was easily performed by branching the order wire signal on the transmission side and selecting an order wire signal having a good transmission path on the reception side. .

However, in a system having a route diversity configuration as shown in FIG. 5, the relay station C provided on the working line a and the relay stations D and E provided on the standby line b are located at different points. Since it is installed, the above-described method cannot be used. Conventionally, if there is a transmission path failure, orderwire communication becomes impossible at that point. Therefore, in this case, the maintenance person recognizes the faulty line and reconstructs the order wire circuit connection. Also, in the route diversity configuration, even at the time of start-up, the maintainer does not connect only one station (the A station in FIG. 5) to the order wire line of one of the transmission lines so that the order wire communication does not become a loop configuration, The procedure of connecting all lines was performed.

[0004]

In order wire communication in the conventional route diversity system, the line connection work is complicated since a maintenance person must set up the order wire line connection each time the transmission system is started up.

[0005] Further, when a failure occurs in the transmission line, order wire communication cannot be performed unless a maintenance person recognizes the transmission line failure and resets the line.
It takes time and effort to restore communication when a failure occurs, which is inefficient.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an order wire communication system which can solve the above-mentioned problems and can improve the efficiency of starting up a transmission system and recovering communication.

[0007]

According to the present invention, first and second terminal stations, an active transmission line and a standby transmission line connecting the first and second terminal stations, The working transmission line relay station present on the transmission line side, and in the order wire communication of the transmission system configured with the protection transmission line side relay station present on the backup transmission line side, when starting up the transmission system, One of the first and second terminal stations performs orderwire line connection setting,
An orderwire line connection request is transmitted to the other terminal station and each of the relay stations to connect orderwire lines of all stations except the one terminal station, and the first and second terminal stations, A working transmission path relay station and the protection transmission path relay station constantly monitor a transmission path for a failure, and the first and second terminal stations, the working transmission path relay station, and the protection transmission path relay station If a failure occurs in the transmission path on the receiving side of any one of the stations, the failure is detected by the destination station of the signal passing through the transmission path, and the failure detection station determines that the failure has not occurred on the transmission path side. And a fault detection signal is sent from the fault detection station to the first or second terminal station closest to the fault detection station. And the line of the spare transmission line is connected. And a line connection request is issued by the first or second terminal station that has recognized the failure detection station failure so as to maintain the order wire line connection of the relay station without failure reception. The system is obtained.

[0008]

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a diagram showing an initial state (state before start-up) of the order wire communication system according to the present invention. FIG. 2 is a diagram showing a line connection state when the route diversity transmission system is started up.

In FIG. 1, A and B are terminal stations, CE are relay stations, and a working line a (hereinafter referred to as a working line)
In) and the backup line b (hereinafter, standby line)
The main signal is transmitted through the working line a or the standby line b. Where
Regular order wire communication is performed via the working line.
When the working line fails, the standby line
Automatic switching to is performed. The order wire communication line c can be established via the working line a and the standby line b. At the time of starting up the transmission system, the terminal station A requests the working line a and the standby line b to connect an order wire line (indicated by a dashed arrow d in FIG. 1), and the line connection is performed in all the stations. Also,
In order to prevent the order wire communication line c from forming a loop, the working line a and the standby line b are not connected at the terminal station A, which is the starting point of the startup.

Next, the operation of the transmission system when a failure occurs on the receiving side of the relay station E after starting the transmission system will be described. FIG. 2 is a diagram showing a line connection state at the time of a transmission line failure. If a failure (indicated by h in FIG. 2) occurs on the receiving side of the relay station E after starting the transmission system, the relay station E having a function of monitoring and detecting the failure performs a failure detection g, and further performs relaying. Upon receiving the main signal output from the station E, the terminal station B recognizes a failure in the transmission path (indicated by f in FIG. 2). At this time, the relay station E disconnects the line on the failure line side by the failure detection g, and the terminal station B transfers the failure recognition signal e to the terminal station A. Thereby, A recognizes a fault in the transmission path (indicated by f in FIG. 2).

After the terminal stations A and B recognize that a failure has occurred in the transmission line, the terminal station A connects the lines of the working line a and the standby line b to each other. The terminal B issues an order wire line connection request (represented by a dashed arrow d in FIG. 1) to the relay stations C and D, and connects the order wire lines of the relay stations C and D. As a result, all but one side of the relay station E that has detected the failure are in the line connection state, and this connection state is maintained even when the failure is recovered.

As shown in FIG. 3, after the fault shown in FIG. 2 is restored, even if a fault (indicated by h in FIG. 2) occurs on another line, for example, on the receiving side of the terminal station B, A failure detection g is performed at B, and the terminal B disconnects the line on the failure line side by the failure detection g, and the terminal B transfers the failure recognition signal e to the terminal A. Thus, A recognizes a fault in the transmission path (indicated by f in FIG. 3).

After recognizing that a fault has occurred in the transmission path, the terminal stations A and B issue an order wire line connection request (indicated by a broken arrow d in FIG. 1) to the relay stations C, D and E. And
The order wire lines of the relay stations C, D, and E are connected. As a result, except for one side (the working line side in FIG. 3) of the terminal station B which has detected the failure, the line connection state is established, and even when the failure is recovered, the connection state is maintained. Therefore, according to the present invention, order wire communication can be performed in all stations without any change even after occurrence / recovery of a failure.

[0015]

As described above, according to the present invention, an order wire line connection request is issued by the terminal station to connect the order wire lines of all the stations at the time of startup,
At the time of a transmission line failure, an order wire line connection request is issued to connect an order wire line of a station other than the station to which the order wire line has not been connected due to the transmission line failure, and the order wire communication can be automatically restored. Therefore, the start-up work and the communication restoration work can be performed quickly and efficiently.

[Brief description of the drawings]

FIG. 1 is a diagram showing an initial state (state at the time of startup) of an orderwire communication system according to the present invention.

FIG. 2 is a diagram showing a state of the order wire communication system according to the present invention when a transmission line fault occurs.

FIG. 3 is a diagram showing a state in which a transmission path failure occurs again after the transmission path failure of the order wire communication system of FIG. 2 has been restored.

FIG. 4 is a diagram showing a conventional order wire communication system that does not have a route diversity configuration.

FIG. 5 is a conventional order wire communication system,
FIG. 6 is a diagram illustrating a state in which a failure has occurred in a transmission path.

[Explanation of symbols]

 A, B Terminal stations C, D, E Relay station a Working line b Standby line c Order wire communication line d Order wire line connection request e Fault recognition signal f Fault recognition g Fault detection h Fault

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) H04M 3/00 H04M 3/08-3/40 H04M 7/00-7/16 H04Q 1/20-1 / 26 H04L 12/00-12/66

Claims (1)

(57) [Claims] 1. First and second terminal stations, and the first and second terminal stations
A working transmission line and a spare transmission line connecting the terminal stations of the above, a working transmission line side relay station present on the working transmission line side, and a protection transmission line side relay station existing on the protection transmission line side. In the order wire communication of the transmitted transmission system, at the time of starting up the transmission system, one of the first and second terminal stations sets an order wire line connection, and connects the order wire line. The request is transmitted to the other terminal station and each of the relay stations, the order wire circuits of all the stations except the one terminal station are connected, and the first and second terminal stations and the working transmission line relay are connected. Station, and the standby transmission line-side relay station constantly monitors the transmission line for faults,
When a failure occurs in a transmission path on the receiving side of any one of the first and second terminal stations, the working transmission path relay station, and the protection transmission path relay station, the transmission path is The fault is detected by the station to which the passing signal is transmitted, and the first or second terminal station that exists in the direction from the fault detecting station on the transmission line side where no fault occurs and is closest to the fault detecting station. A failure detection signal is sent to the terminal and the terminal that recognizes the failure connects the lines of the working transmission line and the spare transmission line, and the first or the second that recognizes the failure detection station failure An order wire communication system, wherein a line connection request is issued by the second terminal station so as to maintain an order wire line connection of the relay station without fault reception.