JPH11127091A - Communication system and power supply method for communication network - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power supply method and a communication system for a communication network in which interruption of communication is avoided in advance even when a power failure takes place in a commercial power supply line in an installed area of an optical line terminator. SOLUTION: The system is provided with an optical line terminator 10 that has a terminal power supply installation 16 to receive power supply and that is placed on a communication line between a communication control station 2 and a subscriber terminal equipment TE, an optical fiber FBI connecting the communication control station 2 and the optical line terminator 10, and a metallic wire MB that connects the optical line terminator 10 and the subscriber terminal TE to conduct communication between the communication control station 2 and the subscriber terminal TE. In this case, a feeder PB1 is provided, which is installed in parallel with the optical fiber FB1 to supply power from the communication control station 2 to the terminal power supply installation 16, and the subscriber terminal TE receives power supply from the communication control station 2 via the optical line terminator 10 through the feeder PB1 and the metallic wire MB.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication network in which an optical fiber line and a metallic line coexist, and more particularly, to avoid a communication interruption due to a stoppage of power supply (such as a power failure) to a subscriber terminal device. And a communication system.

[0002]

2. Description of the Related Art In view of the aging of an existing telephone network mainly constructed of metallic lines and the support for future high-speed and broadband services, a communication control station (telephone station, etc.) and each subscriber terminal are connected to each other. A method has been proposed in which the space is completely converted to an optical fiber. However, if all metallic lines are to be discarded as soon as possible and replaced with optical fiber lines, the shortage of optical fiber supply, excessive economic burden on subscribers, etc. There is a problem to be solved, for example, there is a possibility that excessive investment may be incurred because communication contents cannot be expected.

[0003] Therefore, a communication network system capable of more realistic optical deployment is being studied. In this system, an optical network unit (ONU: Optical Network Unit) having various accommodating capacities of several to several hundred lines is laid in the vicinity of a subscriber's house, and an optical communication is performed between the optical network unit and a communication control station. In addition to being connected by a fiber line, the network configuration is such that an optical line terminal and each subscriber terminal are connected by an existing metallic line. According to this system, a single optical fiber line having a large transmission capacity can be shared by a plurality of subscribers via an optical line terminal, so that it can be said that low-cost and flexible optical deployment is possible.

[0004]

In the above system,
An optical network unit (ONU) is installed near the subscriber's house, and the power required for the optical network unit to operate itself is determined by
It is assumed that power for supplying to each subscriber terminal is supplied from a commercial power supply line. In other words, power supply to each subscriber terminal is realized by the power supply circuit built in the optical line terminal that inputs and regulates the power of the commercial power line and distributes it to each subscriber terminal through a metallic cable. Is done.

[0005] However, since the optical line terminal is installed near the subscriber's home, there is a problem that if the commercial power supply line goes out of power in the subscriber's area, communication in the entire subscriber's area becomes impossible.

In order to achieve uninterruptible power in an emergency, an auxiliary power supply such as a secondary battery may be built in the optical line terminal beforehand. A large auxiliary power supply is needed to secure the power supply,
This is not a preferable method because it leads to an increase in the size and weight of the apparatus.

It is also conceivable that uninterruptible power can be achieved by installing a photovoltaic power generation facility in the optical line terminal.
If the commercial power supply line loses power when the sunshine is insufficient such as in rainy weather or at night, there is a possibility that the commercial power supply line may not function sufficiently due to insufficient capacity, and there is a problem that the installation area of the solar cell becomes too large.

[0008] The present invention has been made in view of such problems of the prior art, and it is possible to prevent a communication interruption even if a commercial power supply line is interrupted in an installation area of an optical line terminal. It is an object of the present invention to provide a power supply method for a communication network and a communication system.

[0009]

SUMMARY OF THE INVENTION A communication system according to the present invention has a terminal power supply for receiving power supply and has a first power supply installed on a communication path between a communication control station and a subscriber terminal. An optical line termination device, an optical fiber connecting the communication control station and the first optical line termination device, and a metallic line connecting the first optical line termination device and the subscriber terminal. A communication system for communicating with the optical network and a subscriber terminal. The communication system includes a first power supply line for supplying power from the communication control station to the power supply equipment for the terminal. Power is supplied from the control station via the first power line and the metallic line via the first optical line terminal.

As described above, since the power is supplied from the communication control station to the power supply equipment for the terminal via the power supply line attached to the optical fiber, the power for the first optical line terminal is supplied to the commercial power supply. Is secured without relying on For this reason, the line between the communication control station and the first optical line terminal is maintained irrespective of a power failure of the commercial power supply or the like. In addition, since power is supplied from the terminal power supply equipment to the subscriber terminal through the metallic wire, power for the subscriber terminal is secured without relying on a commercial power supply. For this reason, it becomes possible for the subscriber terminal to communicate with the communication control station via the first optical line terminal regardless of the power failure of the commercial power supply or the like.

A communication system according to the present invention is connected to a communication control station by an optical fiber, is connected to a subscriber terminal by a metallic wire, and has a terminal power supply facility for receiving power supply. A second optical line terminal different from the first optical line terminal, and a second power supply for supplying power from the terminal power supply of the first optical line terminal to the terminal power supply of the second optical line terminal. A subscriber terminal connected to the second optical line terminal, receiving power from the communication control station via the first optical line terminal through the second power supply line and the metallic line. You may do so.

As described above, if the subscriber terminal connected to the second optical line terminal receives power supply via the first power supply line and the second power supply line and the metallic line, The first feeder can be used effectively to supply power to a large number of subscriber terminals.

In the communication system according to the present invention, the first power supply line is built in an optical fiber cable including an optical fiber connecting between the communication control station and the first optical line terminal. Is also good.

By laying the optical fiber cable incorporating the feeder line in this way, it is not necessary to lay the feeder cable separately from the optical fiber cable.

In the communication system according to the present invention, two or more first optical line terminal devices connected to the first power supply line may be provided.

As described above, since there is no need to provide a power supply line for each optical line termination device, power can be supplied to a plurality of optical line termination devices by effectively using a single power supply line.

In the communication system according to the present invention, the first power supply line is provided along with an optical fiber cable including an optical fiber connecting between the communication control station and the first optical line terminal. It may be included in the cable.

As described above, if the power supply cable is laid separately from the optical fiber cable, the existing optical fiber cable can be effectively used.

The communication system according to the present invention is connected to the communication control station by an optical fiber, is connected to the subscriber terminal by a metallic wire, and has a terminal power supply for receiving power supply. A second optical line termination device different from the second optical line termination device, and the terminal power supply equipment of the second optical line termination device may be supplied with power from a commercial power supply.

Thus, the present system can be applied while effectively utilizing the existing optical line terminal.

In the communication system according to the present invention, the subscriber terminal includes: a voice input / output device for inputting / outputting voice;
A data input / output device for inputting / outputting data, a voice input / output device, a data input / output device, and a voice signal and data input device connected to a metallic line and based on voice input / output via the voice input / output device. Based on the data input / output via the output device, a data signal transmitted in a higher frequency band than the audio signal is merged to generate a synthesized signal, which is sent to the metallic line, and the synthesized signal from the metallic line is sent to the audio signal and the like. A terminal splitter that separates the data into data signals and sends them to the voice input / output device and the data input / output device, respectively;
The communication control station merges a data signal terminal for inputting and outputting a data signal, a voice signal terminal for inputting and outputting a voice signal, a voice signal from the voice signal terminal, and a data signal from the data signal terminal. A control station splitter for generating a synthesized signal and sending the synthesized signal to the optical fiber, separating the synthesized signal from the subscriber terminal into a voice signal and a data signal, and outputting the separated signal to a data signal terminal and a voice signal terminal. You may.

As described above, if the subscriber terminal is provided with the terminal splitter, the communication is multiplexed by effectively using the existing metallic line. Further, if the signal multiplexed by the control station splitter is separated, the communication capacity of the optical fiber can be effectively used.

The power supply method for a communication network according to the present invention is as follows.
In a power supply method for a communication network in which a communication control station and an optical line terminal are connected by an optical fiber, and an optical line terminal and a subscriber terminal are connected by a metallic wire, a method for supplying power to a communication network includes the steps of: Connecting the power supply equipment installed in the office and the power supply equipment for the terminal installed in the optical line terminal with a power supply line attached to the optical fiber; and Supplying power to the subscriber terminal through a feeder line and a metallic line.

In this way, if the intra-station power supply equipment of the communication control station and the power supply equipment for the terminal of the optical line terminal are connected by the power supply line attached to the optical fiber, the power supply is performed while using the equipment for laying the communication line. It is possible to provide wires. Power is supplied to the optical line terminal using this power supply line, and power is supplied from the terminal power supply equipment to the subscriber terminal through the metallic line, so that power is supplied to the subscriber terminal, the optical line terminal, and the communication control station using the optical power supply. It is secured without supplying commercial power or the like to the line terminating device and the subscriber terminal. Therefore, communication is ensured even if there is a power failure such as a commercial power supply.

[0025]

BEST MODE FOR CARRYING OUT THE INVENTION

(First Embodiment) FIGS. 1 to 3 show an embodiment of the present invention.
This will be described with reference to FIG. FIG. 1 is a schematic diagram showing an outline of a communication network, FIG. 2 is a block diagram showing a configuration of a main part of the communication network in detail, and FIG. 3 is an explanatory diagram for explaining a power supply switching operation.

In FIG. 1, a communication optical fiber cable FB is laid from a communication control station 2 such as an exchange station to a customer area. Also, optical fiber cable FB
Is installed in manholes and pipelines from the communication control station 2 to the main wiring point, thereby achieving underground construction. In the customer area, the existing utility pole P on which a commercial power line is laid is installed.
And so on.

In the customer area, one optical line termination unit ONU is provided for each area where a plurality of subscriber homes 4 and 6 are gathered or for each office building 8 requiring a large number of lines. Further, these optical line terminating units ONU are installed in a place near the optical fiber FB in the office building 8 or on the above-mentioned telephone pole P which is close to the subscriber homes 4 and 6.

Each optical line terminal ONU and the communication control station 2 are connected via an optical fiber cable FB, and each optical line terminal ONU is connected to a subscriber in the subscriber's home 4, 6 or office building 8. A terminal (telephone or the like) TE is connected by a metallic cable MB.

Each optical line terminal ONU receives power from a commercial power supply line laid on a utility pole P or the like, operates, and supplies power to each subscriber terminal TE through a metallic cable MB. Further, a metallic cable for power supply (hereinafter, referred to as a power supply cable) is provided along the installation route of the optical fiber cable FB, and each of the optical lines is transmitted from the in-station power supply equipment installed in the communication control station 2 through the power supply cable. Power is supplied to the terminal unit ONU. Then, when commercial power is not supplied to the optical line terminal ONU due to a power failure, the optical line terminal ONU operates while switching to electric power supplied from the in-station power supply equipment of the communication control station 2 via the power supply cable. The power is also supplied to each subscriber terminal TE through the metallic cable MB, thereby automatically avoiding a state in which communication is disabled.

The configuration of this communication network will be further described in detail with reference to FIG. In the communication control station 2, a subscriber line optical line termination circuit FSLT having an optical line termination circuits OCU1 and OCU2 and an optical splitter MDF for enabling optical communication by connecting an exchange and an optical fiber cable FB; Is provided. Further, the optical fiber cable FB
Is connected to the output contact c of the power supply switching unit SW1 in the in-station power supply equipment.

The in-station power supply equipment includes a main power supply PS1, an auxiliary power supply BT1 having a storage battery, a private power generator GN, a power supply switching unit SW1, and a power supply monitoring unit CNT1.

The main power supply PS1 receives the power from the commercial power supply line, regulates the power for operating the equipment in the station, and the power for supplying to the optical line terminal ONU, and outputs the regulated power. When the commercial power supply line in the communication control station 2 is out of power, the private power generator GN automatically starts upon receiving a command from the power supply monitoring unit CNT1, and supplies the power for operating the station equipment and the optical line terminal ONU. To generate power. The auxiliary power supply BT1 receives power from the commercial power supply line to charge the storage battery when the commercial power supply line is normal, and receives power from the private power generator GN when the commercial power supply line fails. To charge. Further, an auxiliary power supply BT
1 also has a power capacity for moving the intra-office facilities and for supplying it to the optical line terminal ONU.

The power supply monitoring unit CNT1 has a main power supply PS
1 and the operation status of the auxiliary power supply BT1 and the private power generator GN are monitored one by one, and when the commercial power supply line is cut off, the private power generator GN is started. Further, when the commercial power supply line is normal, the power supply monitoring unit CNT1 connects the power supply switching unit SW1 to the power supply contact a and holds the power supply switch unit SW1, thereby supplying the power of the main power supply PS1 to the power supply cable P1.
B, the power is supplied to the optical line terminal ONU, and when the commercial power line is interrupted, the power is switched to the power supply contact b to supply the power of the auxiliary power supply BT1 to the optical line terminal ONU through the power supply cable PB.

The optical line terminal ONU installed near the subscriber's house has an optical multiplexing unit MUX connected to the optical fiber cable FB extended from the communication control station 2 and a plurality of optical multiplexing units MUX connected to the optical multiplexing unit MUX. A bidirectional conversion unit TU for the number of lines is provided, and a power supply facility including a main power supply PS2, an auxiliary power supply BT2, a power supply switching unit SW2, and a power supply monitoring unit CNT2 is provided.

Then, by connecting each bidirectional conversion unit TU and the subscriber terminal TE with the metallic cable MB, communication between the optical line terminal ONU and each subscriber terminal TE is enabled, and furthermore, The power is supplied from the power supply equipment to the subscriber terminal TE via a power supply line integrated with each metallic cable MB.

The optical multiplexing unit MUX branches the optical signal transmitted through the optical fiber cable FB to the bidirectional conversion unit TU, and multiplexes the optical signal transmitted from the bidirectional conversion unit TU to form an optical fiber. Output to cable FB.

The bidirectional conversion unit TU converts an optical signal transmitted from the optical multiplexing unit MUX into an electric signal and outputs the electric signal to the metallic cable MB, and an optical / electrical conversion circuit (O / E); The electric multiplexing unit M converts the transmitted electric signal into an optical signal.
An electrical / optical conversion circuit (E / O) for outputting to the UX is provided.

The power supply switching unit SW2 includes a power supply contact d connected to a power supply cable PB attached to the optical fiber cable FB, a power supply contact e connected to the main power supply PS2, and a contact connected to a power supply line of each metallic cable MB. and performs a switching operation in response to a command from the power supply monitoring unit CNT2.

The main power supply PS2 receives electric power from a commercial power supply line laid on a telephone pole P or the like, and
And the power for feeding to each subscriber terminal TE is regulated and output.

When the commercial power supply line is normal, the auxiliary power supply BT2 receives power from the commercial power supply line and charges the storage battery, and when the commercial power supply line is cut off, the power stored in the storage battery is used by the optical line terminal ONU. By moving, the communication function is maintained even during a power failure.

The power supply monitoring unit CNT2 has a main power supply PS.
1 and the operation status of the auxiliary power supply BT2,
If the commercial power line is normal, the power switching unit S
By connecting and holding the power supply contacts e and f of W2, the power of the main power supply PS2 is supplied to each subscriber terminal TE through the power supply line of the metallic cable MB.
When the commercial power supply line is interrupted, the power supplied from the communication control station 2 is supplied to each subscriber terminal TE through the power supply line of the metallic cable MB by connecting the power supply contacts d and f. Therefore, even when the commercial power line is interrupted in the area of the subscriber's house, the optical line terminal ONU itself operates with the power of the auxiliary power supply BT2, and each subscriber terminal is switched from the in-station power equipment of the communication control station 2. Since power is automatically supplied to the TE, a state in which communication is disabled can be avoided.

FIG. 3 shows the switching operation of the power supply switching unit SW1 in the communication control station 2 and the power supply switching unit SW2 in the optical line terminal ONU according to the presence or absence of the above-mentioned power failure of the commercial power supply line. And a power supply path to each subscriber terminal TE by the switching operation.

As described above, according to the present embodiment, the communication optical fiber cable FB is connected between the intra-station power supply equipment installed in the communication control station 2 and the terminal power supply equipment in the optical line terminal ONU. Connect with the power supply cable attached to
When the commercial power line in the area where the optical line terminal ONU is installed is normal (when there is no power failure), the power from the commercial power line is supplied to each subscriber terminal TE through the metallic cable MB. When the commercial power line is interrupted, the power supplied from the in-station power supply equipment in the communication control station 2 through the power supply cable is supplied to each subscriber terminal TE through the metallic cable MB.
Communication interruption can be avoided beforehand.

In this embodiment, in order to supply power from the communication control station 2 to the optical network unit ONU, a power supply cable PB separate from the optical fiber cable FB is provided in parallel. The present invention is not limited to this, and by connecting using an optical fiber cable with a built-in power supply line, the communication between the communication control station 2 and the optical line terminal ONU is made optical, and via the power supply line, A connection may be made between the office power supply and the terminal power supply.

As described in detail above, the present invention preferably has the following configuration. That is, an optical fiber cable is used between the communication control station and the optical line terminal,
In the power supply method for a communication network in which the optical line terminal and the subscriber terminal are connected to each other by a metallic cable, a terminal power supply for receiving power from a commercial power supply line is provided in the optical line terminal, A power supply cable connected to the optical fiber cable connects between an in-station power supply installed in the communication control station and the terminal power supply, and a terminal power supply in the optical line terminal is connected from the commercial power supply line. When power is supplied, power is supplied from the terminal power supply equipment to the subscriber terminal through the metallic cable, and when power is not supplied from the commercial power supply line to the terminal power supply equipment in the optical line terminal, The power supplied from the communication control station to the terminal power supply equipment through a power supply cable is transmitted to the subscriber terminal through the metallic cable. It was decided to supply to.

Also, instead of the optical fiber cable and the power supply cable, an optical fiber cable having a built-in power supply line is used to connect between the communication control station and the optical line terminal and between the intra-station power supply equipment and the terminal power supply equipment. Was connected.

As described above, when electric power is supplied to the terminal power supply equipment from the commercial power supply line in the area where the optical line terminal is installed, power is supplied from the terminal power supply equipment to the subscriber terminal through the metallic cable. Thus, communication between the subscriber terminal and the optical line terminal and the communication control station is secured.

When power is not supplied from the commercial power supply line in the area where the optical line terminal is installed to the terminal power supply equipment due to a power failure or the like, the terminal power supply equipment in the communication control station is connected to the terminal power supply equipment through a power supply cable. By supplying the supplied power to the subscriber terminal through a metallic cable, communication interruption is avoided.

That is, according to the present invention, even when power is not supplied to the terminal power supply equipment from the commercial power supply line in the area where the optical line terminal is installed due to a power failure or the like, the power supply in the communication control station cannot be controlled. Since the power supplied from the power supply equipment to the power supply equipment for the terminal through the power supply cable is supplied to the subscriber terminal through the metallic cable,
Communication interruption can be avoided beforehand, and a highly reliable communication network can be realized.

Further, when power is not supplied from the commercial power supply line to the power supply equipment for the terminal, power is supplied to the subscriber terminal from the power supply equipment in the communication control station, so that reliable maintenance of the communication network can be performed. Is obtained.

When power is not supplied from the commercial power supply line to the terminal power supply equipment, power is supplied from the intra-station power supply equipment in the communication control station to the subscriber terminal. There is no need to provide an auxiliary power supply. For this reason, it is possible to reduce the size and weight of the optical line terminal device, and it is possible to save the space for installation on an existing telephone pole or installation at a subscriber's house.

Further, in a situation where an optical fiber line and a metallic line coexist, it is possible to reliably supply power to a subscriber terminal connected to the metallic line.
It enables flexible optical deployment in the middle of transition to an H-type optical communication network.

(Second Embodiment) Another embodiment of the present invention will be described with reference to FIG. FIG. 4 is a block diagram showing a detailed configuration of a main part of the communication system.

The communication system shown in FIG. 4 shows the main part of the communication system shown in FIG. 1, and therefore, as shown in FIG. An optical fiber cable is laid. The optical fiber cable is buried underground from the communication control station 2 to the main wiring point, and is installed on an existing telephone pole P or the like in the customer area. In the customer area, the optical line terminal 10
One is provided for each area where a plurality of subscriber homes 4 and 6 are gathered or for each office building 8 that requires a large number of lines. These optical line terminating devices 10 are installed at a location near an optical fiber in the office building 8 or at a telephone pole P located near the subscriber terminals of the subscriber homes 4 and 6.

Referring to FIG. 4, a communication control station 2 includes an exchange, and a plurality of intra-office optical line termination circuits OC arranged between the exchange and the optical fiber cable FB to enable optical communication.
A subscriber line optical line termination circuit FSLT having U1 to OCU4 and an optical splitter MDF;
Is provided.

In the example of FIG. 4, one end of the optical fiber FB1 is connected to each of the optical line termination circuits in the office of the communication control station 2, for example, OC.
U1 is connected to the optical network unit 10 (ONU1), and one end of the optical fiber FB2 is connected to the OCU 2 with the optical network unit 10 (ONU2). In-station power supply equipment P
The output contact c of the power supply switching unit SW1 in the WU is connected to one end of a power supply line PB1 provided alongside the optical fibers FB1 and FB2, and the other end is connected to each of the optical line terminators 10 (ON).
U1, ONU2) are connected to the terminal power supply equipment 16.
Similarly, OCU3 and ONU4 are connected to an optical line terminal (not shown) by optical fibers FB3, FB4 and PB2, respectively. Two or more optical line terminators (ONU1, ONU2) connected to the power supply line PB1 may be provided. As described above, since there is no need to provide a power supply line for each optical line termination device 10, power can be supplied to a plurality of optical line termination devices 10 by effectively using a single power supply line PB1. In other words, if the power supply line PB1 is wired to one optical line terminal 10 in the customer area, if a line for supplying power from this optical line terminal 10 is connected by bus, a nearby optical line terminal 10 Power can also be supplied. Thus, a plurality of optical fibers (optical lines) FB1,
If one power supply line PB1 is provided for the FB2 in a bus shape, the configuration of the optical fiber cable is simplified as compared with the case where a power supply line is provided for each line.

Optical fibers FB1, FB2 and feeder line P
B1 is built in the same optical fiber cable FBC1, is laid from the communication control station to each optical line terminal device 10, and the other ends of the optical fibers FB1 and FB2 are respectively connected to the optical line terminal devices. Similarly, the optical fibers FB3 and FB4 and the power supply line PB2 are also built in the same optical fiber cable FBC2. That is, the optical fiber cable is provided with one feed line for a plurality of optical fibers connected to the plurality of optical line terminating devices 10 respectively, and the power supply line supplies the plurality of optical line terminating devices 10 with power. Supply. That is, the optical fiber is wired in a star shape from the communication control station 2 by the optical fiber cable. By laying the optical fiber cables FBC1 and FBC2 each having a built-in power supply line, there is no need to lay the power supply cable separately from the optical fiber cable. In addition, the number p of power supply lines and the number f of optical fibers included in one optical fiber cable may be plural, respectively, and for example, f> p. Further, a power supply line for supplying electric power to an optical amplifier or the like provided in the middle of the optical fiber line may be added or shared.

The in-station power supply equipment PWU is connected to an external power supply supplied from outside the communication control station, for example, a main power supply PS1 supplied with electric power from a commercial power supply, a private power generator GN, an external power supply and a private power generator, and It includes an auxiliary power supply BT1 having a storage battery, a power supply switching unit SW1 for selecting a power supply to be supplied to the optical line terminal 10, and a power supply monitoring unit CNT1.

The main power supply PS1 receives power from, for example, a commercial power supply line and regulates and outputs power for operating facilities in the station and power for supplying to the optical line terminal 10. When the commercial power supply line in the communication control station 2 is out of power, the private power generator GN automatically starts upon receiving a command from the power supply monitoring unit CNT1, and supplies the power for operating the station equipment and the optical line terminal ONU. To generate power. Further, the auxiliary power supply BT receives electric power from the commercial power supply line to charge the storage battery when the commercial power supply line is normal, and receives electric power from the private power generator GN when the commercial power supply line fails. To charge the storage battery. Further, the auxiliary power supply BT1 is also used for moving the office equipment and turning on the optical line terminal.
It has a power capacity to supply to U.

The power supply monitoring unit CNT1 has a main power supply PS
1 and the auxiliary power supply BT1 and the operation status of the private power generator GN are constantly monitored, and the private power generator GN is activated when the commercial power line is cut off. When the commercial power supply line is normal, the power supply monitoring unit CNT1 connects the power supply switching unit SW1 to the power supply contact a and holds the power supply switch unit SW1, thereby supplying the power of the main power supply PS1 to the power supply cable PB.
1. When power is supplied to the optical line terminal 10 through the PB2 and the commercial power line is interrupted, the power is switched to the power supply contact b side and the power of the auxiliary power supply BT1 is supplied to the power supply cable PB1,
The signal is supplied to the optical line terminal 10 through the PB2. Therefore, even when the commercial power supply in the area of the communication control station 2 is stopped due to a power failure or the like, interruption of communication is avoided.

In the present embodiment, unlike the first embodiment, the power supply switching unit SW2, the main power supply PS2,
Since it does not include the auxiliary power supply BT2, the power supply monitoring unit CNT2, and the like, it is possible to simplify the configuration of the optical line terminal devices installed in the system in large numbers. Therefore, the cost of system construction can be reduced, and power is supplied to each subscriber terminal TE from the in-station power equipment of the communication control station 2, so that a state in which communication is disabled due to a power failure of a commercial power supply or the like is avoided beforehand.

Each of the optical network units 10 (ONU 1 and ONU 2) installed near the subscriber's house
Multiplexing unit (MUX) 12 connected to the other end of optical fibers (FB1, FB2) extended from the optical fiber (FB1, FB2), and a bidirectional conversion unit (T) connected to the optical multiplexing unit 10.
U) 14 and a terminal power supply facility 16. Each bidirectional conversion unit 14 is connected to one end of a metallic line (MB), and the other end of the metallic line MB is connected to a subscriber terminal (TE).
It is connected to the. For this reason, each metallic line MB
Communication between the optical line terminal ONU and each subscriber terminal TE becomes possible.

The optical multiplexing unit 12 branches the optical signal transmitted through, for example, the optical fiber FB1 to the bidirectional conversion unit 14 side, and
Multiplex the optical signals transmitted from the optical fiber FB
Output to 1.

The bidirectional conversion unit 14 converts an optical signal transmitted from the optical multiplexing unit 12 into an electric signal, and outputs the electric signal to the metallic line MB.
E), and an electric / optical conversion circuit (E / O) for converting an electric signal transmitted from the metallic line MB into an optical signal and outputting the optical signal to the optical multiplexing unit 12.

The terminal power supply 16 is connected to the other end of the power supply line PB 1, and supplies the power received from the power supply line PB 1 to the optical multiplexing unit 12 and each bidirectional conversion unit 14. Each bidirectional conversion unit 14 further incorporates a combining circuit that combines the power supplied from the terminal power supply facility 16 with the above-described electric signal and supplies the electric signal to the metallic line MB. For this reason, each metallic line MB also serves as a power supply line and is used to supply power from the power supply equipment to the subscriber terminal TE. The subscriber terminal receives power supply through the metallic line MB.

As described above, since the power is supplied from the communication control station 2 to the power supply equipment 16 for the terminal via the power supply line PB1 provided along with the optical fibers FB1 and FB2, Power is secured without resorting to commercial power. Therefore, the line between the communication control station 2 and the optical line terminal 10 is maintained irrespective of the power failure of the commercial power supply. In addition, since power is supplied from the terminal power supply facility 16 to the subscriber terminal TE through the metallic wire MB, power for the subscriber terminal TE is secured without relying on a commercial power supply. For this reason, it becomes possible for the subscriber terminal TE to communicate with the communication control station 2 via the optical line terminal 10 irrespective of a power failure of the commercial power supply or the like. Therefore, communication interruption is avoided.

In this communication system, the communication control station 2 and the optical line terminal 10 are connected by an optical fiber 22, and the optical line terminal 10 and the subscriber terminal TE are connected by a metallic line MB. In a power supply method for a communication system, the optical fiber FB1 is connected between an intra-station power supply facility PWU installed in the communication control station 2 and a terminal power supply facility 16 installed in the optical line terminal device 10. , FB2, and a power supply line PB1 connected to the FB2, and supplies power from the intra-station power supply system PWU to the subscriber terminal TE via the terminal power supply system 16 through the power supply line PB1 and the metallic line MB. It is possible to

As described above, if the intra-station power supply facility PWU of the communication control station 2 and the terminal power supply facility 16 of the optical line terminal 10 are connected by the feeder line PB1 provided along with the optical fibers FB1 and FB2, the communication line The power supply line PB1 can be provided while using the installation facility. Power is supplied to the optical line terminal 10 using the power supply line PB1, and
6 to the subscriber terminal TE through the metallic line MB, the power supply between the subscriber terminal TE and the optical line terminal 10 and the communication control station 2 is controlled by the optical line terminal 10
And it is ensured without directly supplying commercial power or the like to the subscriber terminal TE. Therefore, communication is ensured even if there is a power failure such as a commercial power supply.

(Third Embodiment) Another embodiment of the present invention will be described with reference to FIGS. FIG. 5 is a schematic diagram showing an outline of a communication system, and FIG. 6 is a block diagram showing a main part configuration of the communication system in detail.

In FIG. 5, a plurality of optical fiber cables 20 for communication are laid from a communication control station 2 such as an exchange connected to the public line 1 toward a customer area. The optical fiber cable 20 is laid underground by being laid in manholes and conduits from the communication control station 2 to the main wiring point, and in the customer area, a commercial power line is laid. Is installed on a utility pole P or the like. The optical fiber cable 20 may be distributed by the distributor 18 from the trunk optical fiber cable 20 to a plurality of branch optical fiber cables 30 while traveling to the customer area.

In the customer area, one optical line terminal 10 is provided for each area where a plurality of subscriber terminals 36 are gathered or for each office building 8 requiring a large number of lines. These optical line terminating devices 10 are installed in a place near the optical fiber FB in the office building 8 or
It is installed on the telephone pole P located near the subscriber terminal 36.

Each of the optical line terminal 10 and the communication control station 2
Are connected via optical fiber cables 20 and 30, respectively, and each of the optical line terminal 10 and the subscriber terminal 36 at the subscriber's home or the subscriber terminal (telephone or the like) in the office building 8 is connected.
36 is connected by a metallic line MB. Although not explicitly shown in FIG. 5, the optical fiber cables 20 and 30 are connected to the in-station power supply equipment P of the communication control station.
A power supply line (not shown) for connecting between the WU and the optical line terminal 10 is built in. Therefore, the subscriber terminal 36
, The feed line and the metallic line MB from the communication control station 2
Power is supplied through

Next, the configuration of the present embodiment will be described in more detail with reference to FIG. In FIG. 6, a plurality of communication optical fiber cables 20 are laid from a communication control station 2 such as an exchange station to a customer area. The fiber optic cable 20 may be distributed by the distributor 18 to a plurality of smaller lines of the fiber optic cable 20 during or in the customer area. In this distributor 18, not only the division of the optical line,
The power supply line is also divided. For example, the optical fiber cable 20
Includes 200 optical fibers as optical lines and 20 metallic wires for power supply, and the optical fiber cable 30 includes 20 optical fibers 22 as optical lines and one metallic wire 24 for power supply. I have.

The optical fiber 2 in the optical fiber cable 20
4 is connected to the FSLT in the communication control station 2, the other end is connected to one end of the optical fiber 24 in the optical fiber cable 30 in the distributor 18, and the optical fiber 2
The other end of each 2 is connected to an optical multiplexing unit 12 in the optical line terminal 10, and power is supplied from the communication control station 2. Also, one end of the feed line 24 in the optical fiber cable 20 is connected to a PWU in the communication control station 2, the other end is connected to one end of the feed line 24 in the optical fiber cable 30 in the distributor 18, and The other end of the power supply line 24 of the fiber cable 30 is connected to the terminal power supply equipment 16 in the plurality of optical line terminal devices 10. The terminal power supply 16 supplies power for the subscriber terminal to each bidirectional conversion unit 14, and the bidirectional conversion unit 14 supplies power to the subscriber terminal through the metallic line MB for communication.

As described above, the communication control station 2 is connected to the communication control station 2 by the optical fiber cable 20 including a large number of optical lines. By connecting to the optical fiber cable 30 and dividing the line, it is possible to optically connect with a large number of subscriber terminals in various customer areas, and the power for the subscriber terminal 36 depends on a commercial power supply. Is secured without.
For this reason, the subscriber terminal 36 can be operated regardless of the power failure of the commercial power supply.
Can communicate with the communication control station 2 via the optical line terminal 10. Therefore, communication interruption is avoided.

(Fourth Embodiment) Another embodiment of the present invention will be described with reference to FIG. FIG. 7 is a block diagram showing a detailed configuration of a main part of the communication system.

Referring to FIG. 7, the optical fiber cable 3
An optical line terminal 70 in which one optical line in 0 is terminated is shown. The optical line terminal 70 includes an optical multiplexing unit (MUX) 12 connected to the other end of the optical fiber 22 extended from the communication control station 2, and a bidirectional conversion unit (MUX) connected to the optical multiplexing unit 10. TU) and a terminal power supply 72. Each bidirectional conversion unit 14
As in the second embodiment, it is connected to a subscriber terminal (not shown) by a metallic line (MB). The optical multiplexing unit 12 and the bidirectional conversion unit 14 are the same as those incorporated in the optical line terminal 10 shown in FIG.

The terminal power supply equipment 72 is connected to one end of the power supply line 24, and supplies the power received from the power supply line 24 to the optical multiplexing unit 12 and each bidirectional conversion unit 14. In addition, the terminal power supply equipment 72 includes at least one or more power supply terminals for supplying power to another optical line terminal 74. As such a supply terminal, for example, there is a power supply connector provided on the side surface of the housing of the optical line terminal 72.

The optical line terminal 74 is connected to the optical fiber 22 in the optical fiber cable 32 extended from the communication control station 2.
Multiplexing unit (MUX) 12 connected to the other end of the
, A bidirectional conversion unit (TU) 14 connected to the optical multiplexing unit 10, and a terminal power supply 76.
Each bidirectional conversion unit 14 is connected to a subscriber terminal (not shown) by a metallic line (MB) as in the second embodiment. The optical multiplexing unit 12 and the bidirectional conversion unit 14 are the same as those incorporated in the optical line terminal 10 shown in FIG.

Since the optical fiber cable 32 does not include a power supply line, the terminal power supply
2 cannot receive power from the communication control station 2 via the communication control station 2. For this reason, the terminal power supply equipment 76 receives power supply from the optical line terminal 70. In the example of FIG. 7, the optical line terminal 74 (ONU3) receives power supply from the supply terminal of the terminal power supply 72 of the optical line terminal 70 through the power supply line 77, and ON
U5) is connected to the power supply line 7 from the supply terminal of the terminal power supply equipment 72.
Power is supplied through 8.

As described above, if the power supply line PB1 is wired to one optical line termination device 70 in the customer area, if only the power supply line is connected from this optical line termination device 70 by bus, a nearby optical line Power can be supplied to the termination device 76. That is, the feeder lines 77 and 78 connected to the feeder connector of the optical line terminal 70 are connected to the adjacent optical line terminal 74.
If the power is supplied through the system, a system can be constructed without using an expensive composite optical fiber cable including an optical fiber and a power supply line. Further, when there is enough power capacity of the power supply line, it is not necessary to increase the number of lines by using an expensive composite cable, and the number of optical lines can be increased by using a normal optical fiber cable. . Therefore,
The customer area where the demand for the optical line increases or decreases is provided with the flexibility that only the optical line can be increased or decreased according to the increase or decrease.

In addition, the subscriber terminal 36 connected to the optical line terminal 74 is connected to the power supply line 77 via the power supply line 24.
If power is supplied through the power supply line 78 and the metallic line MB, the power can be effectively used to supply power to a large number of subscriber terminals 36.

The optical line terminal 74 is connected to the communication control station via the optical fiber 24, and is connected to the subscriber terminal 36.
The terminal power supply equipment 76 may be connected to the power supply equipment 76 via a metallic wire MB and receive power supply. The terminal power supply equipment 76 may receive power supply from a commercial power supply. With this configuration, the present system can be applied while effectively utilizing the existing optical line terminal.

(Fifth Embodiment) Another embodiment of the present invention will be described with reference to FIG. FIG. 8 is a block diagram showing the configuration of the main part of the communication system in detail. In this embodiment, in this system, xDSL (x digital su
bscriber line).

Referring to FIG. 8, a subscriber terminal 40 includes a voice input / output device 42 for inputting / outputting voice, a data input / output device 44 for inputting / outputting data, a terminal splitter 46, Is provided. The terminal splitter 46 is connected to one end of the audio input / output device 42, the data input / output device 44, and one end of the metallic line 48.
2 is an electrical signal synthesized by combining a voice signal based on voice input / output via the input / output device 2 and a data signal based on data transmitted in a higher frequency band than the voice signal and input / output via the data input / output device 44. Is generated and sent to the metallic line 48, and the combined electric signal from the metallic line 48 is separated into an audio signal and a data signal and sent to the audio input / output device 42 and the data input / output device 44, respectively. As described above, since the terminal splitter 46 is provided to combine the data signal with the electric signal in addition to the audio signal, the metallic wire 48
Can transmit more information than before. That is, the metallic wire 48 is used for transmitting voice signals and data signals, and for supplying power to the subscriber terminals.

The other end of the metallic line 48 is connected to an optical line terminal 50. The optical line terminal 50 is installed near the subscriber's house, for example, in a range of a metallic line of about several km, and an optical fiber (FB) extended from the communication control station 2.
1, FB2) connected to the other end of the optical multiplexing unit (M
UX) 12, a bidirectional conversion unit (TU) 54 connected to the optical multiplexing unit 10, and a terminal power supply 16. Optical multiplexing unit 12 and power supply equipment 1 for terminal
6 is the same as that of the second embodiment, and the description is omitted.

The bidirectional conversion unit 54 converts an optical signal transmitted from the optical multiplexing unit 12 into an electric signal as a data signal and an audio signal, and outputs the electric signal to the metallic line 48 (O / E conversion circuit). ), And an electric / optical conversion circuit (E / O) for converting an electric signal including a data signal and an audio signal transmitted from the metallic line 48 into an optical signal and outputting the optical signal to the optical multiplexing unit 12. I have.

As described above, since a plurality of bidirectional conversion units 54 are connected to the optical multiplexing unit 12, the optical multiplexing unit 12 receives an electric signal including a data signal in addition to a conventional voice signal from each subscriber terminal. Since this is converted into an optical signal and sent to the optical fiber 22, the communication capacity of the optical fiber 24 can be effectively used.

The optical multiplexing unit 12 is connected to one end of an optical fiber 24, and the other end of the optical fiber 24 is connected to a communication control station 60 through an optical fiber cable 20 including the optical fiber 24.

The communication control station 60 controls the optical fiber cable 2
0, a subscriber line optical line terminal (FSLT) 61 for receiving an optical signal from the optical fiber 24, an exchange 63 connected to the public line 1, and a control station splitter 67.
And an in-station power supply facility PWU (not shown). The control station splitter 67 is connected to the switch 63 from the audio signal terminal 1.
To generate a combined signal by combining the voice signal received via the data signal from the data signal terminal 65 and send the signal to the optical fiber 24 through the subscriber line optical line termination circuit 61,
Further, the combined signal from the subscriber terminal 40 is separated into a voice signal and a data signal, and output to the data line 65 connected to the data signal terminal and the public line 1 connected to the voice signal terminal through the exchange 63.

As described above, when the subscriber terminal is provided with the terminal splitter 46, the communication is multiplexed by effectively using the existing metallic line 48. Further, if the signal multiplexed by the control station splitter 67 is separated, the communication capacity of the optical fiber 24 can be used more effectively.

In the second to fifth embodiments, in order to supply power from the communication control station 2 to the optical line terminal 10, the optical fiber cables 20 and 30 having a built-in power supply line are connected. The use case has been described. But,
The present invention is not limited to this, and in the above-described embodiment, power is supplied from the communication control station 2 to the optical line terminal 10 and the subscriber terminal 36 by using a power supply cable attached to the optical fiber cable. You may do it.

As described above, if the power supply cable is laid separately from the optical fiber cable, the existing optical fiber cable can be effectively used.

On the other hand, as documents relating to the prior art,
JP-A-51-88030 (hereinafter referred to as Reference 1), JP-B-55-42722 (hereinafter referred to as Reference 2), and pages 92 and 93 of the NTT Journal October 1996 (hereinafter referred to as Reference 1). , Reference 3).

Document 1 aims to individually supply power to each optical line included in an optical fiber cable, and is added to an optical fiber transmission line that individually supplies power to each optical fiber line. A communication cable is disclosed. Document 2 discloses that a central drag body of an optical fiber cable is used when power supply to a relay station is required during long-distance transmission.
A metal shell or the like is formed of a conductive material to serve as a power supply line, and to supply power commonly to a communication line composed of a plurality of optical fibers. The purpose of the present invention is to solve the problem that all systems are stopped, and to provide an optical fiber cable having a plurality of divided power supply lines and a reduced number of optical fiber communication systems fed by one power supply line. Disclose. Further, in Reference 3, an optical line terminal is installed in an optical fiber terminal so that a plurality of subscribers can share one optical fiber for communication, and each subscriber communicates with each subscriber by using a metallic wire. A system for performing the above is disclosed. In this system, in order to share one optical fiber among a plurality of subscribers, an optical line terminal is provided at one end of the optical fiber, and each subscriber communicates using a metallic wire.
The optical line terminal and the subscriber terminal are assumed to use commercial power.

Therefore, these documents do not disclose the communication system and the power supply method of the present invention, and the problem that communication interruption is avoided even when a commercial power supply line is cut off in the installation area of the optical line terminal. No means are disclosed.

[0097]

As described above in detail with reference to the drawings, according to the present invention, the power supplied from the in-house power supply equipment in the communication control station to the power supply equipment for the terminal through the power supply cable or the power supply line is provided by the metallic cable. Therefore, communication can be ensured regardless of whether power is supplied from the commercial power supply line. Therefore, communication interruption can be avoided, and a highly reliable communication network can be realized.

Further, since power is supplied to the subscriber terminal from the in-station power supply equipment in the communication control station, reliable maintenance of the communication network can be performed.

Further, since power is supplied to the subscriber terminal from the in-station power supply equipment in the communication control station, there is no need to provide a large-capacity auxiliary power supply in the optical line terminal device. For this reason, it is possible to reduce the size and weight of the optical line terminal device, and it is possible to save the space for installation on an existing telephone pole or installation at a subscriber's house.

In addition, in a situation where an optical fiber line and a metallic line coexist, it is possible to reliably supply power to a subscriber terminal connected to the metallic line.
It enables flexible optical deployment in the middle of transition to an H-type optical communication network.

[Brief description of the drawings]

FIG. 1 is a schematic diagram illustrating an outline of a communication network according to a first embodiment.

FIG. 2 is a block diagram illustrating a detailed configuration of a main part of a communication network according to the first embodiment;

FIG. 3 is a mod diagram for explaining a power supply switching operation of a communication network according to the first embodiment;

FIG. 4 is a block diagram illustrating a detailed configuration of a main part of a communication network according to a second embodiment;

FIG. 5 is a schematic diagram illustrating an outline of a communication network according to a third embodiment.

FIG. 6 is a block diagram illustrating a detailed configuration of a main part of a communication network according to a third embodiment;

FIG. 7 is a block diagram illustrating a detailed configuration of a main part of a communication network according to a fourth embodiment;

FIG. 8 is a block diagram illustrating a detailed configuration of a main part of a communication network according to a fifth embodiment.

[Explanation of symbols]

1: public line, 2, 60: communication control station, 4, 6: subscriber home, 8: office building, P: telephone pole, FB, FB1, FB
2: Optical fiber cable, PB, PB1, PB2: Power supply cable, MB: Metallic cable, ONU: Optical line termination device, TE: Subscriber terminal, FSLT: Subscriber line optical line termination circuit, PS1, PS2: Main power supply, BT1 , BT
2 ... Auxiliary power supply, CNT1, CNT2 ... Power supply monitoring unit, SW1, SW2 ... Power supply switching unit, 10, 50,
70, 74: Optical line terminal, 12: Optical multiplexing unit, 14, 54: Bidirectional conversion unit, 16, 72, 7
6 ... Power supply equipment for terminals 16, 18 ... Distributors, 20, 30,
32 ... optical fiber cable, 22 ... optical fiber, 24 ...
Feeder lines, 36, 40 subscriber terminals, 42 voice input / output devices, 44 data input / output devices, 46 subscriber splitters, 48 metallic lines, 61 subscriber line optical line termination circuits, 63 exchanges, 65: data dedicated line, 67: control station splitter

Claims (8)

[Claims] 1. A first optical line terminal which has a power supply for a terminal for receiving power supply and is located on a communication path between a communication control station and a subscriber terminal; An optical fiber connecting the first optical line terminal, and a metallic line connecting the first optical line terminal and the subscriber terminal; A communication system for performing communication, comprising: a first power supply line provided in parallel with the optical fiber for supplying power from the communication control station to the terminal power supply equipment; A communication system comprising receiving power from a station via the first power line and the metallic line via the first optical line terminal. 2. The first optical line terminal connected to the communication control station by an optical fiber, connected to a subscriber terminal by a metallic wire, and having a terminal power supply for receiving power supply. A second optical line termination device different from the device; a second power supply line for supplying power from the terminal power supply equipment of the first optical line termination device to the terminal power supply equipment of the second optical line termination device. The subscriber terminal connected to the second optical line terminal,
2. The communication system according to claim 1, wherein power is supplied from the communication control station via the second power supply line and the metallic line via the first optical line terminal. 3. 3. The optical fiber cable according to claim 1, wherein the first power supply line is built in an optical fiber cable including the optical fiber connecting between the communication control station and the first optical line terminal. The communication system according to claim 1 or 2, wherein 4. The communication system according to claim 3, further comprising two or more said first optical line terminating devices connected to said first feeder line. 5. A power supply cable provided in parallel with an optical fiber cable including the optical fiber for connecting between the communication control station and the first optical line terminal. The communication system according to claim 1, wherein the communication system includes: 6. The first optical line terminal which is connected to the communication control station by an optical fiber, is connected to a subscriber terminal by a metallic line, and has a terminal power supply for receiving power supply. 2. A second optical line terminal different from the device, wherein the terminal power supply equipment of the second optical line terminal receives power supply from a commercial power supply. 3.
A communication system according to claim 1. 7. The subscriber terminal comprises: a voice input / output device for inputting / outputting voice; a data input / output device for inputting / outputting data; the voice input / output device; and the data input / output device And a voice signal connected to the metallic line and based on voice input / output via the voice input / output device and data input / output via the data input / output device in a higher frequency band than the voice signal. The data input / output device merges with the transmitted data signal to generate a synthesized signal and sends the synthesized signal to the metallic line. And a terminal splitter for sending to the device, the communication control station comprises: a data signal terminal for inputting and outputting the data signal; and An audio signal terminal for output; and a combined signal generated by combining the audio signal from the audio signal terminal and the data signal from the data signal terminal, sending the combined signal to the optical fiber, and the combined signal from the subscriber terminal. 7. A communication system according to claim 1, further comprising: a control station splitter that separates the data signal into a voice signal and a data signal and outputs the data signal terminal and the voice signal terminal. 8. A power supply for a communication network in which a communication control station and an optical line terminal are connected by an optical fiber, and the optical line terminal and a subscriber terminal are connected by a metallic line. In the method, a step of connecting between an in-station power supply facility installed in the communication control station and a terminal power supply facility installed in the optical line terminal device by a power supply line attached to the optical fiber; Supplying power to the subscriber terminal from the power supply equipment via the power supply equipment for the terminal via the power supply line and the metallic wire.