JPS6165539A - Power supply system for submarine transmission lines - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a power supply system for submarine repeaters in a communication system using a submarine cable, and in particular a double-end power supply system in a two-reply submarine transmission system. % In communication systems that use submarine cables, the power necessary to operate submarine repeaters is supplied by submarine cables, and one of the power supply methods is a double-end power supply method.

[Conventional technology]

FIG. 2 is a diagram showing an example of a both-end feeding system in a conventional two-reply submarine transmission system.

In the figure, 1.11 is a power supply, 2.3 is a repeater, 4.5 is a Zener diode, 6.7 is a capacitor, 8.9 is a load, and IO is a power supply line in the submarine cable. It is.

In the conventional power supply system, as shown in Figure 2, power supply types a1 and 11 installed in the land station jointly supply power to repeaters 2 and 3 using the power supply line 10 in the submarine cable. supply. That is, this is a method in which power is supplied from both ends.

Both the power supply 1 and the power supply 11 are constant current power supplies, the power supply 1 always flows a constant current into the feeder line 10 inside the submarine cable, and the power supply 11 always flows the same constant current into the submarine cable. It is taken out from the power supply line 10.

The repeater 2 is provided with a Zener diode 4 at its input end, takes out the voltage drop caused by a constant current from the power supply, removes unnecessary high frequency components with a capacitor 6, and supplies the power supply voltage to the load 8. There is. The repeater 3 is also powered in exactly the same way, with the Zener diode 4 in the repeater 2 and the Zener diode 5 in the repeater 3 connected in series.

As an example, the power supplies 1 and 11 supply a constant current of IA, and the output voltage of the power supplies 1 and 11 is 250, respectively.
■It is.

[Problem that the invention seeks to solve]

As is clear from the above explanation, in the conventional power supply system, the Zener diodes at the input end of each repeater are connected in series to supply power, so when the submarine cable is cut and becomes open, power is not supplied to all repeaters. The problem was that it was impossible to distinguish between submarine cable failures and repeater failures.

An object of the present invention is to provide a power supply system for a two-reply submarine transmission system that eliminates the above-mentioned drawbacks of the conventional power supply system and can isolate faulty sections.

[Means for solving problems]

The means to solve the problem is to adopt a double-end feeding system2.
In a relay submarine transmission system, a diode bridge is provided at the power receiving end of the first repeater, a power receiving Zener diode is connected to the diagonal of the diode bridge, and the positive terminal of the Zener diode is connected to the casing of the first repeater. The casing of the second repeater and the power receiving Zener of the second repeater are connected by the first diode.

A detector that connects the positive terminals of the diodes with a second diode and detects disconnection of the supply current to a line that supplies current to the repeater via a submarine cable, and a switch on the land station side adjacent to the first repeater. This is achieved by detecting interruption of the supply current, driving the switch, and reversing the polarity of the constant current power supply installed at the land station.

[Effect]

According to the present invention, even if the submarine cable between the first repeater and the second repeater is disconnected, the current supply to the first repeater and the second repeater is continued, and the conventional line looping function is maintained. By using them together, it can be confirmed whether the first repeater and the second repeater are operating normally or not, thereby producing the effect of being able to evaluate the faulty section.

〔Example〕

FIG. 1 is a diagram showing an embodiment of a power feeding system for a submarine transmission line in a two-reply submarine transmission system according to the present invention.

In the figure, 21 to 26 are diodes, 27 is a detector, and 2
8 is a switch.

In the present invention, as shown in FIG.
1 to 25 are added, and a diode 26 is additionally connected to the repeater 3.

In the repeater 2, diodes 22 to 25 are connected as shown in the figure.
constitutes a bridge, and the child terminal of the diode 21 is grounded to the casing of the repeater 2. In the repeater 3, the child terminal of the diode 26 is grounded to the casing of the repeater 3.

During normal operation, the supply current is from power supply 1 to power supply line 10 to diode 22 to Zener diode 4 to diode 24.
~Power supply line 10~Zener diode 5~Power supply vA10~
The power is supplied through a route from the power supply 11 to the ground, and the voltage drop across the Zener diode 4 is taken out at the relay 2, and the voltage drop across the Zener diode 5 is taken out at the relay 3, and the voltage drop is taken out from the load 8 as in the conventional case. , to the load 9.

If a disconnection occurs somewhere on the power supply line 10, it is assumed that the disconnection occurs at a location marked with an X, for example. At this time, the supply current ■ naturally becomes O. On the power supply 1 side, the detector 27 detects that the supply current I has become O, and the switch 28 is operated to reverse the voltage polarity of the power supply 1. That is, the normal switching device 28 has its contacts a and C connected, and when its contacts d
are connected and supplying current I in the direction shown by the solid line,
The detector 27 detects that the supply current I has become 0, and drives the switch 28 so that the contacts a and e are connected, and the contact f is connected, and the voltage of the power supply 1 is changed. Connect with reverse polarity.

As a result, a current is supplied through the path of the grounding diode 21 of the repeater 2, the Zener diode 4, the diode 25, the power supply line 10, and the power supply 1.

On the other hand, on the relay 3 side, the earth of the relay 3 - diode 26 ~
Current is supplied through a path from the Zener diode 5 to the power supply line 10 to the power supply 11.

Therefore, both the repeater 2 and the repeater 3 are supplied with current and become operable. However, since the cable between repeaters 2 and 3 is broken, communication between repeaters 2 and 3 is not possible.

However, if there is a normal line loopback function and a line loopback command is issued from the land station with the power supply 1 to the repeater 2, and a loopback signal is returned, it means that the repeater 2 is not out of order. .

Similarly, a land station having a power supply 11 issues a line return command to the repeater 3, and if a return signal is returned, it means that the repeater 3 is not out of order.

Therefore, it can be seen that the cable between repeater 2 and repeater 3 is broken by the above operation.

As described above, by using the line loopback function of the conventional two-reply submarine transmission system and the present invention, it is possible to identify the faulty section.

〔Effect of the invention〕

As described above in detail, the present invention has the great effect of making it possible to identify the faulty section when a submarine cable breaks.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an embodiment of a power feeding system for a submarine transmission line in a two-reply submarine transmission system according to the present invention. FIG. 2 is a diagram showing an example of a both-end feeding system in a conventional two-reply submarine transmission system. In the figure, 1.11 is a power supply for power supply, 2.3 is a repeater, 4.5 is a Zener diode, 6.7 is a capacitor, 8.9 is a load, and 10 is a power supply line in the submarine cable. , 21 to 26 are diodes, 27 is a detector, 2
8 is a switch. $Zg

Claims (1)

[Claims] In a two-reply submarine transmission system that uses a both-end feeding system,
A diode bridge is provided at the power receiving end of the first repeater, a power receiving Zener diode is connected to the diagonal of the diode bridge, the casing of the first repeater and the positive terminal of the Zener diode are connected by the first diode, and the Connect the positive terminal of the 2nd relay case and the power receiving Zener diode of the 2nd relay to the 2nd relay
A detector that detects a disconnection of the supply current to a line that is connected with a diode and supplies current to a repeater via a submarine cable,
and a switching device is provided on the land station side adjacent to the first repeater, detecting disconnection of the supply current and driving the switching device, and reversing the polarity of the constant current power supply installed at the land station. Power supply system for submarine transmission lines.