JPH04344961A - Remote terminal for multiple ring type optical data bus - Google Patents

Abstract

PURPOSE:To prevent the system down due to a fault by exchanging information between processor.power source parts of a primary optical data bus module side and secondary optical data bus module side. CONSTITUTION:Two modules MA and MB are equipped with processor/power source parts 1 and 6, optical amplifiers 2 and 7 amplifying the inputted optical data through optical data bus 11 and 14, optical distributors 3 and 9 distributing the inputted optical data, optical coupler coupling the optical data to be outputted, and optical switches 5 and 10 where contacts are switched by turning on and off the power. The two modules MA and MB are connected so as to exchange information between the processor/power source parts 1 and 6 of each module so as to start up the secondary optical data bus module MB in place of the module MA at the time of the trouble of the primary optical data bus module MA.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a remote terminal for a multiple ring optical data bus which is applied to a system using a multiple ring optical data bus.

0002

2. Description of the Related Art A remote terminal for a multiple ring type optical data bus as shown in FIG. 3 has conventionally existed. In this conventional remote terminal, optical signals are branched and coupled by first converting the optical signals into electrical signals, and then branched and coupled, and the interface with user equipment is also an electrical signal. Therefore, each remote terminal actively participates in signal transmission, and a failure of one remote terminal may lead to total loss of the data bus system (destroying the ring shape).

[0003] Furthermore, since the management control signals of the data bus system and the data transmission signals of the user equipment are transmitted by time division multiplexing using optical signals of the same frequency, noise signals generated in the user equipment can be transmitted. Management and control of the data bus system may become impossible.

0004

[Problems to be Solved by the Invention] The present invention has been made to solve the problems of conventional remote terminals for multiple ring type optical data buses, including the following (1) to (6).
A remote terminal for a multi-ring optical data bus with the characteristics described in Section 1 is realized. (1) Even if the remote terminal's power goes down, the data bus line will not be disconnected, so the system will not suffer a total loss. (2) Since the data bus system and the user equipment can be electrically isolated, there is no propagation of electrical failure signals from the user equipment to the remote terminal. (3) System control led by the data bus system can be constructed. (4) There is no effect on the data bus system due to attachment and detachment of user equipment.

(5) When reconfiguring a data bus system by combining a primary data bus and a secondary data bus, there is no need to convert optical signals to electrical signals, and switching can be performed as optical signals.

(6) Since the optical frequency used by the user equipment for data transmission and the optical frequency used by the data bus system for management control are different, the optical noise emitted by the user equipment affects the management control of the data bus system. Never.

[0007]

[Means for Solving the Problems] As shown in FIG. 1, a remote terminal for a multiple ring optical data bus according to the present invention includes a processor, a power supply (processor/power supply) 1, and an optical A module MA on the primary optical data bus side consisting of an amplifier 2, optical couplers 3 and 4 for combining optical data, an optical switch 5 for switching the optical data transfer path, optical data buses 11 and 12, etc., a processor/power supply 6, and an input. A module MB on the secondary optical data bus side consists of an optical amplifier 7 that amplifies the optical data, an optical coupler 8 and 9 that combines the optical data, an optical switch 10 that switches the optical data transfer path, an optical data bus 13 and 14, etc. and an inter-processor connection interface that enables data transmission and reception between the processors and power supplies 1 and 6 between the modules MA and MB, optical distributors 15 and 16 that distribute optical data, and an optical coupler 17. It is composed of etc.

[0008]

[Operation] In the configuration shown in FIG. 1, if the module MA on the primary optical data bus side is normal, the optical signal f1 for data transmission of the user equipment input from the optical data bus 11
The optical signal f2 for management and control of the data bus system is amplified by the optical amplifier 2, and the optical signal f2 for management and control of the data bus system is branched by the optical coupler 3 at the next stage. sent to.

On the other hand, the optical signal f1 for data transmission is sent to the optical switch 5 and receives an instruction from the processor/power supply 1 (
(when power for optical switch on/off is applied), or
The optical switch 5 is turned on (when power for turning on/off the optical switch is not applied). The data transmission optical signal f1 output from the optical switch 5 is combined with the data bus system management control optical signal f2 to which the status of the processor/power supply 1 is added at the next stage optical coupler 4, and is sent to the optical data bus 12. Sent out. Note that the connection state of the user equipment is detected by the status of the user equipment. However, even if this status indicates a connection state, the connection of the user device to the data bus system can be severed due to the circumstances of the data bus system. This allows control led by the data bus system.

Furthermore, in the remote terminal of the present invention having the above configuration, even if a failure occurs in which the power to the remote terminal is cut down, the optical switch 5 is in a state where the optical signal is passed through. The data bus ring is never disconnected at the remote terminal.

Furthermore, if module MA on the primary optical data bus side fails, it is switched to module MB on the secondary data bus side and operates in the same way as the primary optical data bus.

Module MB of the secondary optical data bus
If the optical data bus fails, the primary optical data bus and the secondary optical data bus are connected within the remote terminal, and the data bus system is reconfigured (see FIG. 2). This means that the user equipment data transmission signal f1 inputted from the optical data bus 11 passes through the optical amplifier 2 and the optical coupler 3 and is transferred from the output terminal a of the optical switch 5 to the output terminal d of the optical switch 10 on the secondary optical data bus side. The signal is output to the optical data bus 13. On the other hand, the data transmission signal f1 input from the optical data bus 14 is output from the output end e of the optical switch 10 via the optical amplifier 7 and the optical coupler 9 in the same manner as described above, and is output from the optical switch 5 on the primary optical data bus side. is outputted to the optical data bus 12 from the output end b of. This maintains the ring configuration of the data bus. Note that this is a reconfiguration method when no user equipment is connected to the remote terminal. The reconfiguration method with user equipment connected is as follows.

That is, the user equipment data transmission signal f1 input from the optical data bus 11 in FIG.
, and the output end c of the optical switch 5 via the optical coupler 3.
The signal is output from the optical coupler 17 and transmitted to the user equipment via the optical coupler 17. The data transmission signal f1 from the user equipment is outputted to the optical data bus 13 via the optical distributor 15 from the output end d of the optical switch 10 on the secondary optical data bus side. On the other hand, the data transmission signal f1 input from the optical data bus 14 is outputted from the output terminal e of the optical switch 10 via the optical amplifier 7 and the optical coupler 9, and is output from the optical switch 5 on the primary optical data bus side. It is output to the optical data bus 12 from end b. It should be noted that which of the above reconfiguration methods to adopt can be determined depending on the circumstances of the data bus system.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing the configuration of a remote terminal for a multiple ring optical data bus according to an embodiment of the present invention.

A remote terminal for a multiple ring optical data bus according to an embodiment of the present invention connects a module MA on the primary optical data bus side, a module MB on the secondary optical data bus side, and each of the above modules MA and MB. It consists of an interface mechanism.

That is, the module MA on the primary optical data bus side includes a processor/power supply 1 and an optical signal for amplifying input optical signals (in this case, an optical signal f1 for data transmission and an optical signal f2 for data bus system management control). An amplifier 2, optical couplers 3 and 4 that combine optical signals, an optical switch 5 that switches the optical signal transfer path, and an optical data bus 1 on the optical data input side.
1 and an optical data bus 12 on the optical data output side.

The module MB on the secondary optical data bus side includes a processor/power supply 6, an optical amplifier 7 for amplifying the input optical signals (f1, f2) similar to the above,
It is composed of optical couplers 8 and 9 that combine optical signals, an optical switch 10 that switches the transfer path of optical signals, an optical data bus 14 on the optical data input side, and an optical data bus 13 on the optical data output side.

[0018] Also, the interface mechanism for connecting the respective modules MA, MB is connected to the respective modules MA, MB.
an inter-processor connection interface that enables data transmission and reception between the processor and the power supplies 1 and 6 between the MBs;
It is composed of optical splitters 15 and 16 that distribute optical data, an optical coupler 17, and the like.

The remote terminal of the embodiment with the above configuration usually has a module M on the primary optical data bus side.
The optical signals f1 and f2 inputted from the optical data bus 11 are amplified by the optical amplifier 2 by more than the insertion loss of this remote terminal, and are sent to the optical coupler 3. Optical coupler 3 provides optical signal f for management and control of the data bus system.
2 is branched and sent to the processor/power supply 1. In the processor/power supply 1, the data bus system management control optical signal f2
In addition to decoding and controlling the data bus system,
The status is sent to the optical coupler 4.

The data transmission signal f1 of the user equipment inputted to the optical switch 5 through the optical coupler 3 simply switches the optical switch 5 according to the state of the optical switch on/off power from the processor/power supply 1. through or sent to the user equipment. The optical signal f1 from the user equipment is
The signal is sent to the optical coupler 4 via the optical distributor 15 and the optical switch 5.

The optical coupler 4 combines the optical signal f1 passed through the optical switch 5 with a management control optical signal f2 to which the status from the processor/power supply 1 is added, and sends it to the next remote terminal. The connection status of the user equipment is detected based on the status from the user equipment, but the processor/power supply 1 determines whether or not to connect the user equipment.

[0022] Before a failure on the primary optical data bus side is detected, operation is switched to the secondary optical data bus side. The operation at this time is the same as that for the primary optical data bus.

If both the primary optical data bus and the secondary optical data bus fail, the primary optical data bus and the secondary optical data bus are connected within the remote terminal to reconfigure the data buses. The reconfiguration method may or may not connect the user equipment.

First, when connecting user equipment, the user equipment data transmission signal f1 inputted from the optical data bus 11 is inputted to the optical switch 5 via the optical amplifier 2 and the optical coupler 3. is output from output terminal c,
The signal is output to the user equipment via the optical coupler 17. An optical signal from the user equipment is input to the optical switch 10 via the optical distributor 15, and is output to the optical data bus 13 from the output terminal d.

On the other hand, the optical signal f1 inputted from the optical data bus 14 is inputted to the optical switch 10 via the optical amplifier 7 and the optical coupler 9, and is inputted to the optical switch 5 from the output terminal e, and the optical signal f1 is inputted from the output terminal b. The signal is then output to the optical data bus 12. The optical signal f2 for management control of the data bus system is branched by optical couplers 3 and 9, and the processor/power supplies 1 and 6 decode the command and add a status.
and 8, it is combined with the optical signal f1 and output to the optical data buses 12 and 13.

Next, in the case where no user equipment is connected, the optical signal f1 input from the optical data bus 11 is input to the optical switch 5 via the optical amplifier 2 and the optical coupler 3, and is output from the output terminal a. is input to the optical switch 10, and is connected to the optical data bus 1 via the optical coupler 8 from the output terminal d.
Output to 3.

On the other hand, the optical signal f1 inputted from the optical data bus 14 passes through the optical amplifier 7 and the optical coupler 9.
The signal is inputted to the optical switch 10, outputted from the output terminal e, inputted to the optical switch 5, and sent to the optical data bus 12 from the output terminal b via the optical coupler 4. The above reconfiguration process is performed by the processor/power supplies 1 and 6.

[0028]

As described above, the remote terminal for multiple ring type optical data bus of the present invention has the following effects. (1) Even if the remote terminal's power goes down, the data bus line will not be disconnected, so the system will not be completely destroyed. (2) Since the data bus system and the user equipment system can be electrically isolated, there is no propagation of electrical failure signals from the user equipment to the remote terminal. (3) System control led by the data bus system is possible. (4) There is no effect on the data bus system due to attachment and detachment of user equipment.

(5) When reconfiguring a data bus system by combining the primary optical data bus and the secondary optical data bus, it is possible to switch the optical signals as they are without converting them to electrical signals.

(6) Since the optical frequency used by the user equipment for data transmission is different from the optical frequency used by the data bus system for management control, the optical noise emitted by the user equipment may affect the management control of the data bus system. It never happens.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of a remote terminal according to an embodiment of the present invention.

FIG. 2 is a diagram showing a reconfiguration form of a multiple ring optical data bus by a remote terminal in the above embodiment.

FIG. 3 is a block diagram showing the configuration of a conventional remote terminal.

[Explanation of symbols]

1, 6... Processor/power supply, 2, 7... Optical amplifier, 3, 4
, 8, 9... Optical coupler, 5, 10... Optical switch, 11, 1
2, 13, 14... Optical data bus, 15, 16... Optical distributor, 17... Optical coupler, MA... Module on the primary optical data bus side, MB... Module on the secondary optical data bus side.

Claims (1)

[Claims] 1. A processor and a power supply section that have a power supply function separate and independent from a user equipment system and control a remote terminal, and an optical amplifier that amplifies optical data input via an optical data bus. It is equipped with two modules each having an optical distributor that distributes input optical data, an optical coupler that combines output optical data, and an optical switch whose contacts are switched by turning on/off the power. A remote terminal for a multi-ring optical data bus characterized by exchanging information between the processor and power supply section of each module to avoid system down due to failure.