JPS6331322A - Optical repeater - Google Patents

Abstract

PURPOSE:To reduce power consumption in an optical repeater, by stopping power supplying to a monitor signal branching/inserting circuit, and outputting a reception signal as it is to an optical transmission circuit, when the drop of a battery voltage is generated after switching to a backup battery. CONSTITUTION:A power source switch circuit 5 supplies a power source 8 to the monitor signal branching/inserting circuit 4 ordinarily, but when a monitor signal 7 shows the drop of the battery voltage after the power is switched to the backup battery due to the disconnection of the power source, the circuit 5 interrupts the supplying of the power source 8. A signal switching circuit 2 outputs a signal from an optical reception circuit 1 to the monitor signal branching/inserting circuit 4 ordinarily, and the signal is outputted afterwards from the monitor signal branching/inserting circuit 4, and the signal on which monitor signals 6 and 7 are superposed, is outputted to an optical transmission circuit 3, but, when the monitor signal 7 shows the drop of the battery voltage, the circuit 2 outputs the signal from the optical reception circuit 1 as it is to the optical transmission circuit 3.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a supervisory signal drop-add circuit that superimposes a supervisory signal on a received signal converted into an electrical signal by an optical receiver circuit and outputs the superimposed signal to an optical communication circuit; This invention relates to an optical repeater that has a battery as a backup power source.

[Conventional technology]

FIG. 2 is a block diagram showing a conventional example of this type of optical repeater.

The optical receiving circuit 1 receives an optical signal, converts it into an electrical signal, and outputs the electrical signal. The supervisory signal add/drop circuit 4 superimposes supervisory signals 6 (other than power input disconnection and battery voltage drop) and 7 (power input disconnection and battery voltage decrease) on the received signal output from the optical receiver circuit 1, and outputs the supervisory signals 6 (other than power input disconnection and battery voltage decrease) to the received signal outputted from the optical receiver circuit 1. Output to 3. The optical communication circuit 3 converts the signal from the supervisory signal add/drop multiplexer 4 into an optical signal and outputs the optical signal.

[Problem that the invention seeks to solve]

In the conventional optical repeater described above, the power consumption of the optical repeater is large because the Ti source is disconnected and the switch is switched to the battery, and the monitoring signal drop-add circuit continues to operate even when the output voltage of the battery drops. There is a drawback that the operating time due to the power supplied by the battery is shortened.

[Means for solving problems]

The optical repeater of the present invention includes a power switch circuit that cuts off power supply to the monitoring signal add/drop circuit when a monitoring signal indicating a battery voltage drop is input after the power source is switched to the battery;
Normally, the received signal from the optical receiver circuit is output to the supervisory signal drop-add circuit, and the received signal output from the supervisory signal add-drop circuit and on which the supervisory signal is superimposed is output to the optical communication circuit to prevent the battery voltage drop mentioned above. and a signal switch circuit that outputs the received signal directly to the optical communication circuit when the monitoring signal shown in FIG.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of an embodiment of an optical repeater according to the present invention.

- In this embodiment, a signal switch circuit 2 is provided between the optical receiver circuit 1 and the optical communication circuit 3, and a power switch circuit 5 is further provided to turn on/off the supply of the power source 8 to the monitoring signal add-drop circuit 4. It is being

The power supply switch circuit 5 normally supplies the power supply 8 to the supervisory signal add/drop circuit 4, but after switching to the backup battery due to a power outage, when the monitor 43 No. 7 indicates a decrease in battery voltage, the power switch circuit 5 Cut off the supply. Signal switch circuit 2
Normally, the signal from the optical receiving circuit 1 is output to the monitoring signal add/drop multiplexer circuit 4.

Thereafter, a signal is output from the supervisory signal drop/add circuit 4 and a superimposed signal of the supervisory signals 6 and 7 is output to the optical communication circuit 3.
When the monitoring signal 7 indicates the battery voltage drop, the optical receiving circuit 1
The signal from the optical communication circuit 3 is output directly to the optical communication circuit 3.

〔Effect of the invention〕

As explained above, in the present invention, when the battery voltage drops after switching to the backup battery due to a power outage, the power supply to the supervisory signal drop-and-drop circuit is stopped, and the received signal is sent directly to the optical communication circuit. By outputting the signal, the power consumption of the optical repeater can be kept low, and the operating time of the optical repeater using the power supplied by the battery can be extended.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an embodiment of an optical repeater according to the present invention, and FIG. 2 is a block diagram of a conventional example. l...Optical receiving circuit. 2...Signal switch circuit. 3... Optical communication circuit, 4... Supervisory signal drop/add circuit. 5...Power switch circuit. 6...Monitoring signal (other than power input disconnection or battery voltage drop). 7... Monitoring signal (power input cutoff, battery voltage drop), 8...
··power supply. Figure 1 Figure 2

Claims (1)

[Scope of Claims] A supervisory signal drop-add circuit that superimposes a supervisory signal on a received signal converted into an electrical signal by an optical receiver circuit and outputs it to an optical communication circuit, and an optical repeater having a battery as a backup power source, After the power is switched to the battery, when a monitoring signal indicating a battery voltage drop is input, a power switch circuit cuts off the power supply to the monitoring signal add/drop circuit, and normally the received signal from the optical receiver circuit is sent to the monitoring signal. The monitor signal is output from the drop-drop/add circuit, and the received signal on which the monitor signal is superimposed is output to the optical communication circuit. When the monitor signal indicating the battery voltage drop is input, the received signal is directly output to An optical repeater comprising a signal switch circuit that outputs to a transmitting circuit.