JP5557643B2 - Station equipment for optical access system - Google Patents

Description

  The present invention relates to a station-side device in an optical access system in which a plurality of subscriber-side devices are connected to one station-side device by an optical fiber and a star coupler to perform data transmission / reception.

  The optical access system is a system in which a plurality of subscriber-side devices are connected to one station-side device by an optical fiber and a star coupler, and data is transmitted and received between the station-side device and the subscriber-side device. Hereinafter, a data signal transmitted from the station side device to the subscriber side device is referred to as a downlink data signal, and a data signal transmitted from the subscriber side device to the station side device is referred to as an uplink data signal.

  The station side device converts the data signal received from the host network from an electrical signal to an optical signal, wavelength-separates the upstream data signal and the downstream data signal, and transmits them to the optical fiber. The downlink data signal sent from the station side device to the optical fiber is distributed by the star coupler and sent to each subscriber side device through each of the plurality of optical fibers.

  The upstream data signal sent from the subscriber side device to the optical fiber is multiplexed by the star coupler and sent to the station side device via the optical fiber. The station side device wavelength-separates the upstream data signal and the downstream data signal in the optical fiber, converts the separated upstream data signal from an optical signal to an electrical signal, and sends it to the upper network.

  The flow of data transmission / reception between the station side device and the subscriber side device in the optical access system is as described above. To perform this data transmission / reception, the subscriber side device needs to be authenticated by the station side device. There is. Authentication is performed in two stages.

  The first stage of authentication is that the subscriber side device is physically connected to the station side device via an optical fiber and a star coupler. In this state, it can be detected that the station side device is connected to the subscriber side device, but data transmission / reception cannot be performed. In order to shift to the first stage state, the station side device periodically checks the presence or absence of the subscriber side device.

  The second stage of authentication is that ID information such as the MAC (Media Access Control) address of the subscriber side device is registered in the station side device. By shifting to the second stage state, the station side device and the subscriber device can transmit and receive data. The station-side device has data to periodically inquire whether or not to transmit data to the subscriber-side device that has been authenticated through the first stage and the second stage (that is, a state in which data can be transmitted and received). Data transmission permission is given only to the subscriber side device, and data transmission / reception is performed.

  In the optical access system as described above, the number of subscriber side devices increases as the number of subscribers increases, so the number of station side devices introduced also increases. Therefore, reduction of power consumption is required for both the subscriber side device and the station side device.

  Therefore, in the invention according to Patent Document 1, in the subscriber side device, a plurality of circuit units that perform processing necessary for data transmission / reception, a power source unit that individually supplies power to each circuit unit, a power source unit and each circuit It is provided with a switch that is individually disposed between and a power control unit that individually controls each switch, and the power control unit controls on / off of each switch according to whether the communication state is good or bad, The power consumption of the subscriber side device is reduced.

  As another example of the data transmission device, for example, a router device according to Patent Document 2 includes a power supply control unit that monitors the state of the lower terminal side port and the upper network side port and controls the power supplied to the port. In order to reduce power consumption, power supply to a port for which a link establishment state has not been detected for a certain period of time is stopped, or power supply to a port for which no access request has been made within a certain period of time is stopped.

JP 2007-89027 A Japanese Patent No. 3570968

  Since the conventional optical access system is configured as described above, it is necessary for the station side device to always supply power to the internal circuit for detecting the connection of the subscriber side device. was there. Further, the station side device always consumes unnecessary power because it always supplies power to the internal circuit even when there is no subscriber side device that performs data transmission and reception. Furthermore, although the station side apparatus is often installed in a place where air conditioning is appropriately managed, there is no function to turn on and off the air cooling fan according to the environment of the installation place, and unnecessary power is consumed.

  The above Patent Document 1 is a configuration that reduces power consumption of a subscriber side device in an optical access system, and is not intended for a station side device. Further, the above Patent Document 2 is configured to monitor the state of the network connection port and reduce the power consumption by stopping the power supply to the unnecessary port. It is not a configuration for controlling the power of the apparatus. Therefore, in the inventions according to Patent Documents 1 and 2, the above-described problems unique to the station-side device cannot be solved.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to reduce the power consumption of the station side device of the optical access system.

The station apparatus of the optical access system according to the present invention includes a plurality of predetermined circuit units, a power supply unit that supplies power to the plurality of predetermined circuit units, and an individual unit between the plurality of predetermined circuit units and the power supply unit. a plurality of switches arranged in a monitoring control unit for monitoring the state of subscriber unit, and a power control unit for individually controlling the on-off of multiple switches, a plurality of predetermined circuit portions, An optical interface unit serving as an interface of an optical fiber connected to a subscriber side device, a PHY processing unit serving as an interface of an upper network, and a signal processing for performing data processing by exchanging data signals between the optical interface unit and the PHY processing unit A monitoring control unit obtains a data signal received from the subscriber side device from the signal processing unit to determine the state of the subscriber side device, and the power source control unit determines the subscription determined by the monitoring control unit. Depending on the state of the side unit, and controls the on-off switch individually.

  According to this invention, the state of the subscriber side device is monitored in the station side device, and the power supply of unnecessary circuit units is turned off according to the state, so that the power consumption of the station side device can be reduced. .

1 is a block diagram showing a configuration of an optical access system according to Embodiment 1 of the present invention. FIG. It is a device information transfer sequence from a subscriber side device to a station side device. It is a data transmission request sequence from the subscriber side device to the station side device. It is a flowchart which shows operation | movement when a station side apparatus receives apparatus information. It is a block diagram which shows the structure of the optical access system which concerns on Embodiment 2 of this invention.

Embodiment 1 FIG.
In the optical access system shown in FIG. 1, n subscriber side devices 301-1 to 301-n are connected to one station side device 101 via a star coupler (SC) 202. The station side device 101 and the star coupler 202 are connected by an optical fiber 201, and the star coupler 202 and each of the subscriber side devices 301-1 to 301-n are connected by optical fibers 203-1 to 203-n. The The optical signal (downlink data signal) transmitted from the station side device 101 is distributed to the optical fibers 203-1 to 203-n by the star coupler 202 and transmitted to the subscriber side devices 301-1 to 301-n. The optical signals (uplink data signals) transmitted from the subscriber side devices 301-1 to 301-n are coupled to one optical fiber 201 by the star coupler 202 and transmitted to the station side device 101.

  The station side device 101 manages device information of a device power supply unit 102 that receives power supply from an external power source, an air cooling fan 103 that prevents temperature rise inside the device, and authenticated subscriber side devices 301-1 to 301-n. The apparatus monitoring control part 104 which has a database to perform, and the transmission / reception part 105 which transmits / receives a data signal are provided.

  The transmission / reception unit 105 includes a PHY processing unit 151, a signal processing unit 152, an optical interface unit 155 including a laser diode (LD: Laser-Diode) 153 and a photodiode (PD: Photo-Diode) 154, and wavelength separation. A multiplexing unit (WDM: Wavelength Division Multiplexing) 156, a power supply unit 157, a monitoring control unit 158, a power supply control unit 159, and switches 160-1 to 160-3 are provided.

  The power supply unit 157 receives power supply from the apparatus power supply unit 102 and supplies power to each unit of the transmission / reception unit 105. A switch 160-1 is disposed on the power supply line connecting the power supply unit 157 and the PHY processing unit 151, and a switch 160-2 is disposed on the power supply line connecting the power supply unit 157 and the signal processing unit 152. A switch 160-3 is disposed on a power supply line connecting the power supply unit 157 and the optical interface unit 155. Then, the power control unit 159 connected to the switches 160-1 to 160-3 controls the on / off of the switches 160-1 to 160-3 to the PHY processing unit 151, the signal processing unit 152, and the optical interface unit 155. Switching between power supply and power-off.

  In FIG. 1, three circuit units of the PHY processing unit 151, the signal processing unit 152, and the optical interface unit 155 are targeted for power reduction. In addition, power supply lines are connected from the power supply unit 157 to the monitoring control unit 158 and the power supply control unit 159, and these circuits are always supplied with power during operation of the station side apparatus 101. On the other hand, since the wavelength demultiplexing unit 156 is a passive component that does not receive power supply, a power supply line is unnecessary.

  The PHY processing unit 151 is an interface that connects to a higher level network and controls the physical layer, and outputs a signal received from the higher level network to the signal processing unit 152 and also receives a signal input from the signal processing unit 152. Send to.

  The signal processing unit 152 processes the electrical signal input from the PHY processing unit 151 and outputs the processed electrical signal to the laser diode 153, and processes the electrical signal input from the photodiode 154 and outputs the processed electrical signal to the PHY processing unit 151. Specifically, the error correction code added to the data signals received from the subscriber side devices 301-1 to 301-n is deleted, the device information is separated, and the data signal received from the upper network An error correction code is assigned to the ID, or an ID for specifying device information is assigned to the ID. Furthermore, a periodic monitoring signal is generated and transmitted in accordance with an instruction from the monitoring control unit 158, and the separated device information is output to the monitoring control unit 158.

  The laser diode 153 converts the electrical signal input from the signal processing unit 152 into an optical signal and outputs the optical signal to the wavelength demultiplexing unit 156. The photodiode 154 converts the optical signal input from the wavelength demultiplexing unit 156 into an electrical signal.

  The wavelength demultiplexing unit 156 demultiplexes and multiplexes the upstream data signal and the downstream data signal of the optical signal transmitted and received by the optical interface unit 155 and the optical fiber 201. The upstream data signal separated from the optical signal received from the optical fiber 201 is output to the photodiode 154, and the downstream data signal input from the laser diode 153 is multiplexed with the optical signal and transmitted to the optical fiber 201.

  In order to monitor the state of the subscriber side devices 301-1 to 301-n, the monitoring control unit 158 gives an instruction to the signal processing unit 152 to transmit a periodic monitoring signal every certain monitoring period. Then, the power supply control unit 159 is instructed to switch between power supply and power-off in accordance with the contents returned from the subscriber side devices 301-1 to 301-n.

  FIG. 2 shows a device information transfer sequence from the subscriber side devices 301-1 to 301-n to the station side device 101. The monitoring control unit 158 instructs the signal processing unit 152 to transmit a cycle monitoring signal every certain monitoring cycle. The newly connected subscriber side devices 301-1 to 301-n return the device information in response to the periodic monitoring signal, thereby confirming that the subscriber side device is connected to the station side device 101. Tell.

  FIG. 3 shows a data transmission request sequence from the subscriber side devices 301-1 to 301-n to the station side device 101. Similarly to the above, the subscriber side devices 301-1 to 301-n send back data transmission requests to the periodic monitoring signals transmitted from the station side device 101 every certain monitoring period, so that the upstream side to the station side device 101 is returned. Request permission to send data signals.

Next, the operation of the station side device 101 will be described.
In the station apparatus 101, the monitoring control unit 158 instructs the signal processing unit 152 to transmit a cycle monitoring signal (downlink data signal) for each monitoring cycle as shown in FIGS.
The upstream data signal transmitted from the subscriber side devices 301-1 to 301-n and transmitted through the optical fiber 201 is demultiplexed with the downstream data signal by the wavelength demultiplexing unit 156 and is input to the photodiode 154. In the photodiode 154, the upstream data signal is converted from an optical signal to an electrical signal, the converted electrical signal is processed by the signal processing unit 152, and if device information or a data transmission request is included, the monitoring control unit 158 is processed. Output.

FIG. 4 is a flowchart showing an operation when the station apparatus 101 receives apparatus information.
When the device information transmitted from the newly connected subscriber side devices 301-1 to 301-n is received, the monitoring control unit 158 acquires the MAC address information of the subscriber side device included in the device information, and The data is output to the device monitoring controller 104 (step ST1). The device monitoring control unit 104 checks whether or not the MAC address is registered in the database held by itself, and notifies the monitoring control unit 158 of the confirmation result (step ST2).

  If the MAC address is registered (step ST2 “registered”), the monitoring control unit 158 is in a state where the subscriber side device having the MAC address is physically connected to the station side device 101, and It is determined that the station side device 101 is authenticated (step ST3). Then, the monitoring control unit 158 continues to transmit a cycle monitoring signal for each monitoring cycle.

  On the other hand, if the MAC address is not registered (step ST2 “no registration”), the monitoring control unit 158 is in a state where the subscriber side device having the MAC address is physically connected to the station side device 101. Then, it is determined that the station side device 101 is not authenticated (step ST4). In the unauthenticated state, since communication between the station apparatus 101 and the upper network is not necessary, the monitoring control unit 158 instructs the power supply control unit 159 to turn off the switch 160-1, and the power supply of the PHY processing unit 151 Is cut to reduce power consumption (step ST5). The signal processing unit 152 and the optical interface unit 155 supply power in order to continue sending the period monitoring signal. Then, the monitoring control unit 158 continues to transmit a cycle monitoring signal for each monitoring cycle.

  On the other hand, when the station apparatus 101 receives a data transmission request transmitted by the subscriber apparatuses 301-1 to 301-n in the authenticated state, the monitoring controller 158 instructs the signal processor 152 to permit data transmission. The downlink data signal having the content to be transmitted is transmitted, and the data signal is transmitted and received.

  In addition, there are subscriber-side devices 301-1 to 301-n in an authenticated state, but when there is no data transmission request during a predetermined period and no data signal is transmitted / received, between the station-side device 101 and the upper network. Since communication is not required, the monitoring control unit 158 instructs the power supply control unit 159 to turn off the switch 160-1 and cut off the power supply of the PHY processing unit 151 to reduce power consumption. The signal processing unit 152 and the optical interface unit 155 supply power in order to continue sending the period monitoring signal.

  Further, even if the station side device 101 transmits a cycle monitoring signal for each monitoring cycle, there is no response from the subscriber side devices 301-1 to 301-n during a predetermined period, and the device monitoring control unit 104 holds the response. When the MAC address is not registered in the database to be monitored, the monitoring control unit 158 determines that the subscriber-side devices 301-1 to 301-n are not connected to the station-side device 101 at all. Then, the supervisory control unit 158 instructs the power supply control unit 159 to turn off the switches 160-1 to 160-3, and the PHY processing unit 151, the signal processing unit 152, and the optical interface unit 155 are turned off to consume power. Further reduction of

  In the illustrated example, the switch 160-2 for switching the power supply of the signal processing unit 152 and the switch 160-3 for switching the power supply of the optical interface unit 155 are separately installed. One switch may be installed in front, and the power supply of the signal processing unit 152 and the optical interface unit 155 may be switched simultaneously.

  As described above, the station-side device 101 according to the first embodiment has the optical interface unit 155 that serves as an interface of the optical fiber 201 connected to the subscriber-side devices 301-1 to 301-n and the PHY processing that serves as an interface of the upper network. 151, a signal processing unit 152 that exchanges data signals between the optical interface unit 155 and the PHY processing unit 151, a power processing unit 157 that supplies power to these circuit units, and these circuit units Data signals received from a plurality of switches 160-1 to 160-3 individually disposed between the power supply unit 157 and the subscriber side devices 301-1 to 301-n are acquired from the signal processing unit 152. The monitoring control unit 158 that determines the state of the subscriber side devices 301-1 to 301-n, and the subscriber side devices 301-1 to 303-1 that are determined by the monitoring control unit 158. And configured to include a power control unit 159 that controls the on-off switch 160-1～160-3 individually depending on the state of the 1-n. For this reason, it becomes possible to cut off the power supply of unnecessary circuit units according to the state of the subscriber side devices 301-1 to 301-n, and the power consumption of the station side device 101 can be reduced.

Embodiment 2. FIG.
FIG. 5 is a block diagram showing a configuration of the optical access system according to the second embodiment. The station-side device 101 according to the second embodiment newly includes a temperature sensor 106 and a switch 170. 5 that are the same as or equivalent to those in FIG. 1 are assigned the same reference numerals, and descriptions thereof are omitted.

  The temperature sensor 106 is attached in the housing of the station-side device 101 and detects the internal temperature of the housing. The switch 170 is disposed in a power supply line that connects the device power supply unit 102 and the air cooling fan 103, and switches between power supply and power supply cut-off by on / off control of the device monitoring control unit 104.

  The device monitoring control unit 104 also functions as a power supply control unit, and controls on / off of the switch 170 and outputs a control signal to the air cooling fan 103. If the internal temperature of the station-side device 101 detected by the temperature sensor 106 is equal to or lower than a predetermined temperature, the device monitoring control unit 104 turns off the switch 170 to cut off the power supply of the air-cooling fan 103 and the power consumption of the station-side device 101 To reduce. When the air cooling fan 103 is stopped and the temperature inside the station side device 101 rises and exceeds a predetermined temperature, the device monitoring control unit 104 turns on the switch 170 to operate the air cooling fan 103 again. The control signal is used so that the internal temperature of the housing is within the specifications of the station side device 101.

  As described above, the station side apparatus 101 according to the second embodiment includes the temperature sensor 106 that detects the internal temperature of the housing, the air cooling fan 103 that suppresses the internal temperature rise, and the air cooling fan 103 and the apparatus power supply unit 102. The switch 170 arranged and the apparatus monitoring control unit 104 that controls on / off of the switch 170 of the air cooling fan 103 according to the temperature detected by the temperature sensor 106 are provided. For this reason, the power consumption of the station side apparatus 101 can be reduced by controlling the use of the air cooling fan 103.

  In the first and second embodiments, the station-side apparatus 101 is configured to include one transmission / reception unit 105. However, the transmission / reception unit may be configured to include a plurality of transmission / reception units 105. The operation 105 may be performed in the same manner as described above.

  In the first and second embodiments, assuming a configuration including a plurality of transmission / reception units 105, the power supply line of the apparatus power supply unit 102 is branched to each circuit of the transmission / reception unit 105 via the power supply unit 157. However, for example, when the transmission / reception unit 105 has one configuration, the power supply line is directly connected from the apparatus power supply unit 102 to each circuit of the transmission / reception unit 105, and the switches 160-1 to 160-3 are respectively disposed. Also good. Then, the power supply control unit 159 may perform on / off control of the switch 170 in addition to the switches 160-1 to 160-3.

  DESCRIPTION OF SYMBOLS 101 Station side apparatus, 102 apparatus power supply part, 103 air cooling fan, 104 apparatus monitoring control part, 105 transmission / reception part, 106 temperature sensor, 201 optical fiber, 202 star coupler, 203-1 to 203-n optical fiber, 301-1 301-n Subscriber side device, 151 PHY processing unit, 152 signal processing unit, 153 laser diode, 154 photodiode, 155 optical interface unit, 156 wavelength demultiplexing unit, 157 power supply unit, 158 monitoring control unit, 159 power supply control unit 160-1 to 160-3, 170 switches.

Claims (5)

In a station side device of an optical access system in which a plurality of subscriber side devices are connected to one station side device by an optical fiber and a star coupler to transmit and receive data signals
A plurality of predetermined circuit parts;
A power supply unit for supplying power to the plurality of predetermined circuit units;
A plurality of switches individually disposed between the plurality of predetermined circuit units and the power source unit;
A monitoring control unit for monitoring the state of the subscriber side device;
The off before Symbol plurality of switches and a power control unit for individually controlling,
The plurality of predetermined circuit units are:
An optical interface unit serving as an optical fiber interface connected to the subscriber side device;
A PHY processing unit serving as an interface for the upper network;
A signal processing unit that performs data processing by exchanging data signals between the optical interface unit and the PHY processing unit;
The monitoring control unit obtains a data signal received from the subscriber side device from the signal processing unit, determines a state of the subscriber side device,
The power supply control unit individually controls on / off of the switch according to the state of the subscriber side device determined by the monitoring control unit . The power control unit, subscriber unit central terminal of the optical access system of claim 1, wherein turning off the switch of the PHY processing unit when a state of not being authenticated. The power control unit of claim 1, wherein is a state in which the subscriber unit is authenticated, characterized by turning off the switch of the PHY processing unit when a state in which transmission and reception of the data signal is not performed Station equipment on the optical access system. The power supply control unit includes a PHY processing unit, an optical interface unit, and a signal processing unit when there is no authenticated subscriber-side device and no data signal is received from the subscriber-side device. central terminal of the optical access system of claim 1, wherein turning off the respective switches. A temperature sensor for detecting the internal temperature of the station side device;
An air cooling fan that suppresses an internal temperature rise of the station side device;
A switch disposed between the air cooling fan and the power supply unit;
The station apparatus of the optical access system according to claim 1, wherein the power control unit controls on / off of a switch of the air cooling fan according to a temperature detected by the temperature sensor.

Images