JPS61189037A - Optical terminal station device - Google Patents

Abstract

PURPOSE:To simplify remarkably a switching constitution scale by providing a switching means for executing in a lump the switching of existing and stand-by multiplexing circuits and an electro-optical converting circuit, and the switching of existing and stand-by optical-electrical converting circuits and a separating circuit. CONSTITUTION:When some fault is generated in an existing multiplexing circuit 6 and an electro-optical converting circuit 8 in a transmitting part 1, and its fault is detected by a switch controlling circuit 22 through a beam splitter 11, an optical switch 19, an optical-electrical converting circuit 20 and a separating circuit 21, a signal for switching the existing transmission system to the stand-by transmission system is generated onto a line 23 and 24, and the former is switched to the transmission passing through the stand-by transmission system. Even in case when the fault is generated in an existing optical-electrical converting circuit 14 and a separating circuit 16 in a receiving part 2, a signal for showing the generation of its fault is sent to the switch controlling circuit 22 from the separating circuit 16, and a signal for making a switch 18 switch the existing receiving system to the stand-by receiving system is generated onto a line 25 from the switch controlling circuit 22.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention summarizes a system of components that can be handled by including as much as possible in switching between working and standby transmitter/receiver sections, rather than switching between each component individually. The present invention relates to an optical terminal device that performs switching.

In order to maintain a high level of reliability in optical terminal equipment that constitutes an optical communication system, means for duplicating its constituent elements has been adopted. When performing such duplication, a problem arises as to how to switch the duplexed components to maintain the reliability of the device. Such a problem should be fully considered when a plurality of components are duplicated, taking into consideration the scale of the switching means.

[Prior art] Multiplexing circuits and electrical equipment are used as elements constituting optical terminal equipment.
It includes an optical conversion circuit, an optical-electrical conversion circuit, a separation circuit, etc., but conventionally, from the viewpoint of improving the reliability of the device, switching is performed for each required component.

[Problem that the invention seeks to solve]

The conventional switching system employs a technique in which a switching means is provided for each required component to switch the component. Therefore, the number of switching means increases, and the configuration of the switching section inevitably becomes larger.

[Means for solving problems]

The present invention provides an optical terminal device that solves the above-mentioned problems as much as possible, and the means thereof includes a transmitter that multiplexes a plurality of input signals and performs electrical-to-optical conversion, and a transmitter that performs electrical-to-optical conversion, and In an optical terminal device configured with a receiving section that performs
The transmitting section is provided with a working and standby multiplexing circuit and an electric-to-optical conversion circuit, and the receiving section is provided with a working and standby optical circuit.
An electrical conversion circuit and a separation circuit are provided, and switching between the current multiplexing circuit and electrical-optical conversion circuit and the backup multiplexing circuit and electrical-optical conversion circuit, and switching between the current optical-electrical conversion circuit and separation circuit and the backup circuit is performed. This configuration includes a switching means for collectively switching between the optical-to-electrical conversion circuit and the separation circuit.

[Effect]

According to the device of the present invention, switching between the current multiplexing circuit and electrical-to-optical conversion circuit and the backup multiplexing circuit and electrical-to-optical conversion circuit of the optical terminal equipment, and the switching between the current multiplexing circuit and the electrical-to-optical conversion circuit and the separation Switching between the converting circuit and the standby opto-electrical converting circuit and separating circuit can be performed at once, respectively.

Therefore, the simplification of the switching means can be greatly promoted.

〔Example〕

Hereinafter, the present invention will be described in detail based on the accompanying drawings.

The accompanying drawings show an embodiment of the optical terminal equipment of the present invention.

The transmitter l is shown at the top, and the receiver 2 is shown at the bottom,
In between, the switching control section 3 is shown.

The transmitter 1 multiplexes the signals from the hybrid coil 4.5 with a hybrid coil (H) 4 that receives digital signals from system #1 and a hybrid node coil (H) 5 that receives digital signals from system #2. active and standby multiplexing circuits (MUX) 6.7 and multiplexing circuit 6
Current electrical-to-optical conversion circuit (O3) connected to the output of
and a spare electrical-optical conversion circuit (O3) 9 connected to the output of the multiplexing circuit 7, and an optical switch (OPTSW).
) 10, a beam splitter (B/5) 1) interposed between the electro-optical conversion circuit 8 and the optical switch 10, and a beam splitter (B/5) interposed between the electro-optical conversion circuit 9 and the optical switch IO. It consists of a beam splitter (B/5) 12.

The receiving unit 2 includes a beam splitter (B/5) 13 that receives the transmitted light, and a working and standby optical-electrical conversion circuit (OR) 14 that is optically coupled to each of the divided outputs of the beam splitter 13. .15 and optical-to-electrical conversion circuit 14.1
Separation circuit (DMUX) 1 connected to each output of 5 separately
6.17 and the system-specific signals separated into separate system outputs by the separation circuit 16.17 are routed to system #1. It consists of a switch 18 that switches to #2 separately and outputs the output.

The switching control unit 3 is the beam splitter 1). Optical switch (OPTSW) 1 optically coupled to 12 divided outputs
9 and a light optically coupled to the output of the optical switch 19.
An electrical conversion circuit (OR) 20, a separation circuit (DMUX) 21 connected to the output of the circuit 20, and a separation circuit 21,
It consists of a switch control circuit (SW C0NT) 22 connected to the signal error detection output of 16.17, and this switch control circuit 22 generates switching of the optical switch 10.19 in response to the output of the separation circuit 21. Connect the signal to line 2
3.24, a signal is generated in response to the output of the separation circuits 16 and 17 to switch the output of the active separation circuit 16 and the backup separation circuit 17 and output it to systems #1 and #2. It is configured to occur on line 25.

The operation of the component device as described above will be explained.

For convenience of explanation, it is assumed that both the transmitter 1 and the receiver 2 have active systems for transmitting and receiving signals. To this end, a switch control circuit 22 generates a signal on a line 23 that causes the light from the beam splitter 1) to be propagated to the transmission output via the optical switch 10, and also causes the light from the beam splitter 1) to be propagated via the optical switch 19. while generating a signal on the line 24 to be propagated to the optical-to-electrical conversion circuit 20, while the currently used separation circuit 16 separates the signals to the respective systems #1 to the corresponding systems #1. #
Assume that a signal to be output to line 25 is generated on line 25.

In the above-mentioned transmission/reception state, for example, the transmitter l
Some kind of failure occurs in the current multiplexing circuit 6 and electrical-to-optical conversion circuit 8 in the beam splitter 1). Optical switch 19. Optical-electric conversion circuit 20 and separation circuit 2
1 through the switch control circuit 22, the line 2
A signal is generated on 3 and 24 to switch the active transmission system, which had been used for signal transmission, to the backup transmission system, and the transmission is switched to the backup transmission system.

Then, measures such as replacing the currently used multiplexing circuit 6 and/or the electrical-to-optical conversion circuit 8 are taken.

Even if a fault as described above occurs in the current optical-to-electrical conversion circuit 14 and separation circuit 16 in the receiving section 2, a signal indicating the occurrence of the fault is sent from the separation circuit 16 to the switch control circuit 22. The switch control circuit 2 sends a signal that causes the switch 18 to switch from the current receiving system to the backup receiving system.
2 on the line 25. In this way, the receiving system is switched from active to standby. In this case as well, measures such as replacing the currently used optical-to-electrical conversion circuit 14 and/or separation circuit 16 are taken.

Also, switching from standby to active use is done using the same fault detection system using line 2.
The signal generated on 3.24 or 25 is simply made to be a signal indicating it.

As is clear from this, the manually generated switching signal is supplied to the OR circuit together with the automatically generated signal as described above, and from the OR circuit the lines 23, 24 or 25
Switching between active and standby can also be accomplished by configuring circuit 22 to generate a signal that causes the intended switching.

〔Effect of the invention〕

As explained above, according to the present invention, ■ it is possible to perform simultaneous switching of the widest possible configuration range between the active and backup systems using the same failure detection system, and ■ the scale of the switching configuration can be significantly increased. Effects such as simplification can be obtained.

[Brief explanation of the drawing]

The accompanying drawings illustrate one embodiment of the invention. In the figure, 1 is a transmitting unit, 2 is a receiving unit, 3 is a switching control unit, 4.5 is a hybrid coil, 6°7 is a multiplexing circuit, 8.9 is an electric-optical conversion circuit, ■1°12, 13 Hahee-A, 2. splitter, 10.19 is an optical switch, 14,
15.20 is a photo-electric conversion circuit, 16.17.21 is a separation circuit, 18 is a switch, and 22 is a switch control circuit.

Claims (3)

[Claims] (1) In an optical terminal device configured with a transmitting section that multiplexes a plurality of input signals and performs electrical-to-optical conversion, and a receiving section that performs the inverse conversion, the transmitting section multiplexes working and backup signals. In addition to providing a switching circuit and an electrical-to-optical conversion circuit, the receiving section is also provided with a working and spare optical-to-electrical converting circuit and a separation circuit, and a working multiplexing circuit and an electrical-to-optical converting circuit and a spare multiplexing circuit and an electrical - An optical system characterized by being provided with a switching means for simultaneously switching between the optical conversion circuit and the current optical-electrical conversion circuit and separation circuit and the backup optical-electrical conversion circuit and separation circuit. Terminal equipment. (2) The switching means includes a circuit for detecting a fault occurring in the circuit to be switched, and causes the switching in response to the detection of the fault. Optical terminal equipment. (3) The means is configured such that the output signal of the detection circuit is supplied to an OR circuit together with the output signal of a circuit capable of sending out a manual switching signal, and the output signal of the OR circuit is used for the switching. The optical terminal device according to claim 2, characterized in that: