JPS63305634A - Submarine transmission network supervising system - Google Patents

Abstract

PURPOSE:To set the range of monitor for each branch of a submarine transmission network by sending a monitor signal from a demultiplexer to a repeater and the demultiplexer while being superimposed on a main transmission pulse train and storing a monitor information signal obtained into a memory. CONSTITUTION:A control signal reception monitor information storage transfer section 21 receives a control signal 25 sent from an on-land terminal station while being superimposed on a main transmission pulse, a monitor signal 26 is sent to repeaters 31, 32, 33 from a monitor signal transmission monitor information reception section 23 corresponding to the content of the control signal while being superimposed on the main transmission pulse train, or reads out a monitor information signal 27 stored corresponding to the content of the received control signal and transfers it to the on-land terminal station while being superimposed on the main transmission pulse train. The repeaters 31-33 receive the monitor signal 26 to detect required monitor items such as the operating state of each section and sends a monitor information signal 28 to the demultiplexer 11 while being superimposed on the main transmission pulse train.

Description

Detailed Description of the Invention "Field of Industrial Application" This invention relates to a repeater in a submarine transmission network that includes a demultiplexer installed under the sea and connects three or more land terminal stations by time-division multiplexed optical digital signals. This paper relates to a submarine transmission network monitoring method for monitoring demultiplexing equipment and demultiplexing equipment from land terminal stations.

"Conventional technology" A conventional submarine transmission network is a connecting point between two land terminal stations.
two point) (poiot to point)
It is a method. This conventional monitoring method for submarine transmission networks involves superimposing a monitoring signal on the main transmission pulse train transmitted and received between opposing land terminal stations.
'The pulse train is transmitted using pulse phase modulation or mark rate modulation, and the submarine repeater receives and detects the monitoring signal, monitors the operating status of the repeater, and uses the monitor information signal to perform main transmission.・Modulates the e-Russ and transmits it to the land terminal station.

This conventional monitoring method is implemented by installing a demultiplexing device within the submarine transmission network, and recombining the route sequences (minutes!/minute) during transmission under the sea.
It cannot be applied to submarine transmission networks that connect three or more land terminal stations using time-division multiplex optical digital communications. That is, as shown in FIG. 3, the land terminal station 1.
~1. is the underwater branch transmission line 2. ~2. The underwater multiplexer/demultiplexer 11 is connected to the underwater multiplexer/demultiplexer 13 through the underwater trunk transmission line 12, and the underwater multiplexer/demultiplexer 13 connects to the underwater branch transmission line 24-2.
They are connected to land terminal stations 14-16 through Il, respectively. Undersea branch transmission line 21.2. Undersea branch transmission line repeaters 14 and 15 are respectively inserted into the undersea trunk transmission line 1.
Undersea trunk transmission line repeaters 3□ to 3 are inserted in series to 2.

Time-division multiplexed optical digital signals are transmitted and received at each of the land terminal stations 1□ to 16, respectively, and the transmission pulse trains that reach the underwater demultiplexer 11.13 from these land terminal stations 11 to 1 are The reorganization was carried out, and six land terminal stations1
A submarine transmission network will be constructed linking between 1 and 16.

When monitoring an underwater repeater or an underwater multiplexer/demultiplexer, the conventional method is to superimpose a monitoring signal on the main transmission pulse train sent from the land terminal station 1□ and transmit it, as shown in Figure 4. The operating status of the repeater 14 and the demultiplexer 11 is detected by the monitoring signal, which is transmitted as a monitor information signal superimposed on the main transmission Noculus train sent to the land terminal station 1□. Undersea branch transmission line repeater 14
, the underwater demultiplexer 11 can be monitored.

However, for example, from the land terminal station 11 to the underwater backbone transmission line repeater 3
1, the monitoring signal is superimposed on the main transmission pulse train, that is, for example, the main transmission pulse train is
Even if the f pulse is phase modulated and transmitted, the main transmission or pulse train is recombined by the underwater demultiplexer 11.
One part goes to the underwater trunk transmission line 12, the other part goes to the land terminal station It.
It is branched and transmitted to tIll. For this reason, the superimposed monitoring signal is disturbed, and the repeater 3□ cannot reliably detect this monitoring signal. Similarly, even if the monitor information signal indicating the operating state detected by the repeater 3 is superimposed on the main transmission pulse train sent out from the repeater 3 and sent out, this main transmission/cell train is transmitted to the demultiplexer 11. Since the sequence of signals is rearranged, the monitor information signal superimposed at the land terminal station 1 cannot be extracted correctly. Therefore, in the example submarine transmission network shown in FIG.
and 13 repeater 3. -33 cannot be monitored.

One way to avoid this is to insert a signal for monitoring signals at a predetermined specific position in the time-division multiplex signal train at the land terminal station, and then use the underwater demultiplexer to monitor the signal. It is possible to rearrange the pulse sequences so that the pulse position of the signal can be maintained. However, in this case, all the submarine repeaters inserted in the transmission line will be used to monitor specific locations! It is necessary to extract signals and insert one word of monitor information/nurses, which has the disadvantage that the scale of the underwater repeater becomes extremely large. From this point of view, as mentioned above, no effective monitoring system for submarine transmission networks including demultiplexing devices has yet been proposed.

"Means for Solving the Problem" According to the present invention, in a submarine transmission network that includes an underwater demultiplexer and connects three or more land terminal stations, the pulse train is transmitted superimposed on the main transmission pulse train from the land terminal station. A control signal receiving unit that receives a control signal, and a monitoring unit that generates a monitoring signal that detects the operating status of the repeater and demultiplexer according to the received control signal, and superimposes it on the main transmission/nursing sequence and transmits it. a signal transmitter, a monitor information receiver that receives the detected monitor information signal transmitted from the repeater or demultiplexer superimposed on the main transmission pulse train, and a memory that stores the received monitor information signal; The underwater demultiplexer is provided with a transfer means for superimposing the monitor information signal stored in the memory on the main transmission pulse train and transmitting it to the land terminal station in accordance with the received control signal, and the control signal from the land terminal station is By superimposing the monitoring signal from the demultiplexing device onto the main transmission pulse train and sending it to the repeater or demultiplexing device, the monitor information signal obtained by this is stored in the memory of the demultiplexing device. A monitoring range can be set for each branch, and even if the monitoring signal or monitor information signal is transmitted superimposed on the main transmission or route train, there is no risk of disturbance within the monitoring range, and it can be transmitted from the land terminal station. A necessary monitor information signal can be obtained by reading and transferring the monitor information signal from the memory.

Embodiment FIG. 1 shows an example in which the monitoring system of the present invention is applied to the submarine transmission network shown in FIG. 3, and parts corresponding to those in FIG. 3 are given the same reference numerals. In this embodiment, the undersea demultiplexer 11.13 includes a control signal reception monitor information storage and transfer unit 2.
1.22, supervisory signal transmission monitor information receiving section 23.24
and are provided respectively. The control signal reception monitor information storage and transfer unit 21 receives the main transmission data from the land terminal station. The control signal 25 transmitted superimposed on the pulse train is received, and the supervisory signal 26 is superimposed on the main transmission pulse train from the supervisory signal transmission monitor information receiving section 23 in accordance with the content of the control signal, and the relayer 31
=32 The monitor information signal 27 stored in correspondence with the content of the control signal transmitted to or received from the w3g is read out, superimposed on the main transmission pulse train, and transmitted to the land terminal station.

The supervisory signal transmission monitor information receiving unit 23 superimposes the supervisory signal 26 according to the contents of the received control signal on the main transmission pulse as described above and transmits it to the repeaters 31, 3□, 33. The monitor information signal 28 superimposed on the other main transmission pulse train is received, and the monitor information signal is detected and stored in the memory of the control signal reception monitor information storage and transfer section 21.

A specific example of the control signal reception monitor information storage and transfer unit 21 is shown in the second example.
As shown in the figure. That is, repeater 3. ~3. If you want to monitor
When a control signal indicating that all monitoring items such as radar output and error rate in the repeater are to be monitored is superimposed on the main transmission pulse train and transmitted from the land terminal station, this is transmitted to the control signal receiving section 31.
When it is detected that this control signal is a command to monitor all the monitoring items of repeaters 31 to 33,
The command signal 32 indicating this is sent to the monitoring signal generator 33.
Output to. Upon receiving this command, the supervisory signal generator 33
In response to this command, in this example, a monitoring signal indicating all-term monitoring is sent to repeater 3. ~3. The monitoring signal including the selection signal of each repeater is automatically generated sequentially for each repeater, and the monitoring signal is sent to the monitoring signal transmission monitor information receiving section 23. 26, the signal is sent to the repeaters 31 to 33 in the same format as a conventional monitoring signal.

Each repeater 31 to 33 receives the monitoring signal 2 as in the conventional system.
6 is received, necessary monitoring items such as the operating status of each part are detected, and the monitor information signal 28 is main transmitted/4'
The signal is superimposed on the pulse train and transmitted to the demultiplexer 11. The monitor information signal 28 is received and detected by the monitor signal transmitting monitor information receiving section 28 of the demultiplexing device 11, and the detection output is written into the memory 34 in the control signal receiving monitor information storage transfer section 21. The operations described above are always performed, and the contents of the memory 34 are always updated.

The land terminal station sends a control signal 25 indicating a transfer command as necessary.
This signal is received and detected by the control signal receiving section 31, and the detection output is supplied to the memory 34 as a transfer command signal 35.
The content of is read out, and the read monitor information signal is superimposed on the main transmission non-loose string and transferred as a signal 27 to the land terminal station.

The land terminal station receives and detects the monitor information signal 27, and can know the operating status of each part of the repeaters 31 to 33. As a result, if it is desired to particularly monitor a specific monitoring item of a specific item in the repeaters 3□ to 3, 1, such a command is sent as a control signal 25, and a command signal 32 indicating this command is sent to the monitor. The signal generator 21 generates a monitoring signal for monitoring a specific monitoring item of a specific repeater.
3 as a signal 26. In other words, the content of the supervisory signal generated by the supervisory signal generator 33 can be changed by the control signal 25 from the land terminal station.

Note that the repeaters 31 to 3. Controls such as switching back-up lasers can also be performed from the land terminal station. For example, repeater 3.
When switching the laser, the relay 3□ is instructed and a command indicating laser switching is sent out using the discrimination signal 25. This is received and detected by the control signal receiving section 31, and a command signal 32 indicating this is sent to the monitoring signal generating section 33, which generates a monitoring signal indicating laser switching of the repeater 32.
This monitoring signal is transmitted from the monitoring signal transmission monitor information receiving section 23 as a monitoring signal 26 in the same format as the conventional one, superimposed on the main transmission pulse train, and is received by the repeater 3□ to execute laser switching.

Although the supervisory signal generator 33 is provided in the above, the control signal 25 is in the same format as a conventional supervisory signal, and the reception detection output of this control signal received by the control signal receiver 31 is directly transmitted to the supervisory signal transmission monitor. The signal may be supplied to the information receiving section 23, superimposed on the main transmission/rouse sequence, and transmitted as the signal 26.

"Effects of the Invention" As described above, in the Denotal submarine transmission network including the underwater demultiplexer, the underwater demultiplexer has a control signal receiving function, a supervisory signal transmitting function, and a monitor information signal that is received and stored in the memory. By providing a function and a function to transfer the monitor information signal of the memory according to the control signal,
It is possible to set the monitoring range for each branch of the network and monitor all repeaters, demultiplexers, and transmission lines without providing a function to extract or insert specific pulses from the main transmission pulse train within the repeater. It becomes possible.

Moreover, the currently used method of superimposing the supervisory signal and the monitor information signal on the main transmission line on the main transmission line and transmitting the superimposed signal can be used as is.

According to this invention, since the monitoring section is divided by the node demultiplexer of the submarine transmission network, within each section, the monitoring signal and the monitor information signal are superimposed on the main transmission line/fP pulse train. However, there is no risk of these signals being disturbed;
When configuring a submarine transmission network, there are fewer restrictions on monitoring and a greater degree of freedom.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a configuration example of a monitoring system according to the invention, FIG. 2 is a block diagram showing parts related to the invention in the demultiplexer 11, and FIG. 3 is a block diagram showing an example of a submarine transmission network. 4 are explanatory diagrams in the case where the conventional monitoring method is applied to the submarine transmission network shown in FIG. 3.

Claims (1)

[Claims] (1) A demultiplexing device installed underwater demultiplexes the time-division multiplexed digital signals, and then superimposes them on the main transmission pulse train from the land terminal stations in a submarine transmission network that connects three or more land terminal stations. a control signal receiving unit that receives control signals transmitted by the control signal receiving unit; and a monitoring signal that causes the control signal received by the control signal receiving unit to detect the operating status of the repeaters and demultiplexing devices that constitute the submarine transmission network. a monitor information receiving section that receives the detected monitor information signal that is transmitted from the repeater or demultiplexer while being superimposed on the main transmission pulse train; , a memory for storing the received monitor information signal, and a transfer means for superimposing the monitor information signal stored in the memory on a main transmission pulse train and transmitting it to the land terminal station in accordance with the received control signal. A submarine transmission network monitoring system characterized in that the demultiplexing device is provided with: