JPH0243832A - Submarine repeating system - Google Patents

Abstract

PURPOSE:To efficiently detect a faulty point of a submarine cable by providing a 2nd conductor to which one diode or over is connected in series with a 1st conductor at an equal interval in addition to a signal wire and a feeder. CONSTITUTION:The submarine cable 1 is accommodated with a conductor 3 connecting with plural diodes 7 at an equal interval in series and a return conductor 5 in addition to conventional signal wires and feeders. Moreover, a variable voltage supply circuit 6 supplying a voltage between the conductors 3, 5 and a current detection circuit 8 to measure a current flowing to the conducts 3, 5 are provided in a submarine repeater 9. Thus, when the submarine cable 1 is broken at a location 2, the conductor 3 at the broken face 2 is conductive to sea water 4 and connected to the folded conductor 5. Thus, the fault location of the submarine cable 1 is located by a voltage fed to the conductors 3, 5 and the diodes 7 and a current flowing thereto to improve the maintenance performance.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a submarine relay system, and particularly to a submarine relay system that detects failure points in the relay section.

[Conventional technology]

FIG. 2 shows the configuration of a loopback conventionally used as a means of fault point evaluation in submarine repeaters. As shown in FIG. 2, this method takes the faulty transmission path offline and connects the terminal station 10 to each upstream and downstream transmission system 12.
A unique pulse pattern assigned to the 13 repeaters 9 is sent out, and the uplink repeater output a specified by this pattern is connected to the downlink repeater output. As a result, the uplink signal is looped back to the downlink and returns to the terminal station 10 again. Then, the terminal station 10 repeatedly loops back from the front repeater 9, compares the transmitted and received signals, and searches for a faulty section. In addition, in Figure 2, 1
1 indicates the signal line of uplink and downlink transmission systems 12 and 13.

[Problem to be solved by the invention]

However, by searching for a fault using the conventional loopback method described above, it has not been possible to determine where the fault is between the L1 repeaters. Therefore, when making repairs, it is necessary to route the cables from the repeater in the faulty section and find the point of fault. However, recently the relay intervals have become longer, especially in optical submarine relays, where the intervals have increased to 1100 mm.
Therefore, if the conventional loop pack method is used to search for the failure point, there is a problem in that it is inefficient.

[Means to solve the problem]

In order to solve such problems, the submarine relay system of the present invention includes a first conductor and a second conductor in which one or more diodes are connected in series at equal intervals, separate from the signal line and the power supply line. Undersea cable and this first. It consists of a variable voltage supply circuit that supplies voltage between the second conductors and a submarine repeater that has a current detection circuit that measures the current flowing through those conductors.

[Effect]

According to the present invention, it is possible to detect a fault point in a submarine cable based on the voltage supplied to the conductor and the diode and the current flowing through the conductor and the diode.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of a submarine relay system according to the present invention. This embodiment is composed of a submarine cable 1 and a submarine repeater 9, and the submarine cable 1 is equipped with a plurality of (four in this example) diodes T in addition to normal signal lines and power supply lines. Make sure to connect the wires in series at intervals 1
A book conductor 3 and a folded conductor 5 are accommodated. Additionally, in the submarine repeater 9, in addition to a circuit with a normal repeating function, there is also a variable voltage supply circuit 6 that supplies voltage between each conductor 3 and 5, and a variable voltage supply circuit 6 that measures the current flowing through those conductors 3.5. A fluid detection circuit 8 is provided for this purpose.

Thus, when the submarine cable 1 is cut at a certain point 2, the conductor 3 at the cut surface 2 is connected to the folded conductor 5 through the seawater 4. At this time, the combined resistance of the conductor 3, seawater 4, and folded conductor 5 is R(I7). Here, when a voltage of Vl is supplied from the variable voltage supply circuit 6, a bottom pressure drop occurs due to the forward voltage of the combined resistance R (R) and the N diodes 7 up to the cutting surface 2, and the current detection circuit A current 11 flows through 8. Therefore, the relationship in equation (1) holds true.

■, = (v, -v, XN)/R*1111all(1
) However, the current v1 flowing through the II l fluid output circuit 8
:Voltage supplied from variable voltage supply circuit 6■? = Forward voltage N due to diode 7: Number of diodes 7 to failure point R: Combined resistance of warm seawater and conductor 3.5 Similarly, when voltage Vzk is supplied to T from variable power supply circuit 6, current detection circuit The current I2 flowing through 8 is as shown in equation (2).

I 2 ” (V 2 V P X N ) / R
* * * ++ a (2) However, I2: Current flowing through the current detection circuit 8 v2: Voltage supplied from the variable voltage supply circuit 6 If Ri is eliminated from equations (1) and (2) above and solved for N, N = (VzI+-VtI2)/My(II-
It )...(3). Therefore, it can be determined that the failure point of the submarine cable 1 is between the Nth and (N+1)th diodes 7.

〔Effect of the invention〕

As explained above, the submarine relay system of the present invention can evaluate the location of a fault point on a submarine cable based on the voltage supplied to the conductor and the diode and the current flowing through it, thereby significantly improving the workability of its maintenance. The practical effect is extremely large.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing one embodiment of the present invention, and FIG.
The figure is a conventional block configuration diagram. 1... Submarine cable, 2... Cut surface, 3...
・Conductor, 4... Seawater, 5... Folded conductor,
6...Variable voltage supply circuit, 7...Diode,
8.--Current detection circuit, 9φ fist...Submarine repeater.

Claims (1)

[Claims] In a submarine relay system, a submarine cable has a first conductor and a second conductor in which one or more diodes are connected in series at equal intervals in addition to a signal line or a power supply line, and a submarine cable between the first and second conductors. What is claimed is: 1. A submarine relay system comprising: a variable voltage supply circuit for supplying voltage to a submarine; and a submarine repeater having a current detection circuit for measuring current flowing through those conductors.