JPH10233761A - Light transmitting system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the power consumption of a subscriber-side device and to reduce the cost of the subscriber-side device by providing a starting control means which periodically supplies power to a transmission/reception part for the subscriber-side device. SOLUTION: The starting control circuit 51 controlling the periodical supply and stop of power to the light transmission/reception part containing a user's unit interface circuit 49, a speed/frame conversion circuit 48, an AGC amplifier circuit 42, a timing extraction synchronizing circuit 43, an identification circuit 44, a transmission buffer circuit 45 and a reception buffer circuit 46 at the time of non-communication is provided for the subscriber-side device. The starting control circuit 51 receives a control signal from the station-side device from the speed/frame conversion circuit 48, executes discrimination at the time of communication or at the time of non-communication and stops the supply of power at the time of non-communication. Since the capacity of a battery for securing same holding time can be reduced, a power device can be miniaturized and the cost of the subscriber-side device can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is applied to an optical subscriber line transmission system. The present invention relates to an optical transmission system in which a subscriber device is stopped for a certain period of time to reduce power consumption during standby.

[0002]

2. Description of the Related Art In order to meet the demands for communication diversity and high speed, the optical fiber network of a subscriber line, which forms the basis of a communication infrastructure, is being promoted. PDS (Passive Double S) has been proposed as a method for realizing all-optical subscriber systems.
tar) There is a point / multipoint optical transmission system using an optical subscriber line system.

FIG. 1 shows an example of the configuration of this point-multipoint optical transmission system. A plurality of n subscriber units M ₁ to M _{1 are connected} to one station unit C via an optical star coupler S.
This is a method in which _Mn is accommodated.

Here, the downstream optical signal is split at the optical star coupler S and transmitted in a broadcast format to a plurality of subscriber units M _{1 to} M _n . In each subscriber unit M ₁ ~M _n, it receives a time-division multiplexed signal of a plurality subscriber, extracts the communication signal addressed to the own apparatus from the time-division multiplexed signal. On the other hand, in the upstream direction, each of the subscriber units M _{1 to} M _n transmits an upstream optical signal within the time domain to which it is assigned. Uplink optical signals from the plurality of subscriber units M _{1 to} M _n join at the optical star coupler S and are received by the central unit C.

FIG. 2 shows an example of a block configuration of the subscriber unit and the optical line terminal in the conventional time division multiplex point / multipoint optical transmission system. Since the block configuration of a plurality of subscriber units is the same, the block configuration is shown only for one subscriber unit.

The station-side device C includes a switch 21 for switching between transmission and reception, an AGC amplifier circuit 22 for controlling the degree of amplification according to the input level of the received signal and maintaining the output amplitude at an appropriate level, and for extracting the timing at the station side. A timing extraction synchronization circuit 23 for performing frame synchronization, an identification circuit 24 for identifying 0/1 of a received signal from an output of the AGC amplification circuit 22, and burst-like reception data temporarily stored based on the timing extracted by the timing extraction synchronization circuit 23. And a transmission buffer circuit 25 for temporarily storing transmission data and transmitting the data in bursts according to the clock of a clock circuit 27, and a transmission buffer circuit 25 for receiving the transmission data. Speed / frame conversion circuit 28 for optical transmission connected to buffer circuit 26
And Similarly, the subscriber unit M also has a switch 41 for switching between transmission and reception, an AGC amplifier circuit 42 for controlling the amplification according to the input level of the received signal and maintaining the output amplitude at an appropriate level, A timing extraction synchronization circuit 43 for performing extraction and frame synchronization,
A discrimination circuit 44 for discriminating the received signal from 0/1 from the output of the AGC amplification circuit 42; a reception for temporarily storing burst-shaped reception data based on the timing extracted by the timing extraction synchronization circuit 43 and outputting the data at the original data rate; A buffer circuit 46 is connected to the transmission buffer circuit 45 for temporarily storing transmission data and transmitting the data in bursts according to the timing extracted by the timing extraction synchronization circuit 43, and the transmission buffer circuit 45 and the reception buffer circuit 46. Speed / frame conversion circuit 48 for performing optical transmission, a home equipment interface circuit 49 for interfacing with home equipment, an AGC amplification circuit 42, a timing extraction synchronization circuit 43, an identification circuit 44, a transmission buffer circuit 45, and a reception circuit. A buffer circuit 46, a speed / frame conversion circuit 48,
A power supply circuit 50 for supplying power to the home device interface circuit 49;

FIG. 3 shows an example of a transmission / reception diagram in the time division multiplex point / multipoint optical transmission.

As shown in FIG. 3, signals are exchanged between the station-side device and the subscriber-side device by alternately switching between transmission and reception in burst cycle units. From the optical line terminal to the subscriber side device, an optical signal in which signals to a plurality of subscriber side devices are time-division multiplexed in a burst cycle is transmitted in a broadcast format. In the uplink direction, each subscriber device transmits an uplink optical signal within a time domain assigned to each of the subscriber devices. The control of the upstream optical signal position of each subscriber side device is as follows.
This is performed under the control of the optical line terminal so that the upstream optical signals of the plurality of optical network units do not collide with each other.

[0009]

In this prior art, the subscriber units need to supply power to receive control signals from these station units even though they are not communicating. There is. In addition, it is also possible to start up by a control sequence, but in this case, it is necessary to supply power for receiving a control signal.
For this reason, it is necessary to always supply power to the subscriber side device in order to receive the control signal from the station side device. For this reason, there has been a problem that the power supply and the battery become large, and the subscriber unit becomes expensive.

An object of the present invention is to solve such a problem, and an object of the present invention is to provide an optical transmission system capable of reducing the power consumption of the subscriber unit and reducing the price of the subscriber unit. I do.

[0011]

According to an aspect of the present invention, one station-side device and n (n is a natural number) subscriber-side devices are connected to each other via an optical fiber and are connected to each other. The side device and the subscriber side device perform bidirectional communication in units of a burst period, and the burst period is determined by the time domain of a downlink signal from the station side device to the subscriber side device and from the subscriber side device. Separated into a time domain of the upstream signal to the optical network unit, wherein the optical network unit transmits a downstream signal to the optical network unit in a time domain of the downstream signal to the optical network unit, Is an optical transmission system for transmitting an uplink signal in a time domain allocated to each subscriber side device, wherein the subscriber side device includes activation control means for periodically supplying power to a transmission / reception unit. And

[0012] The activation control means may include means for stopping the subscriber unit for a certain period of time during non-communication by a control signal included in a downlink signal from the station side apparatus.

[0013] Further, the subscriber side device includes a call detection means and a call detection means, and the activation control means determines whether the call detection means or the call detection means makes a call or a call. First activation control means for supplying power to the transmission / reception unit upon detection, and second activation for periodically supplying power to the first activation control means, the call detection means and the call detection means. It is preferable to include control means.

Further, the present invention can be applied to a subscriber line transmission system in which n subscriber units are accommodated in a central unit via one optical star coupler.

According to the present invention, the subscriber unit is provided with activation control means for controlling activation and stop of the subscriber unit. During non-communication, the home appliance interface, the speed / frame converter, and the optical transmitter / receiver periodically repeat power supply and stop under the control of the activation control means. In addition, it distinguishes between communication and non-communication by a control signal from the station side device, and stops power supply during non-communication. At the time of activation, if a call from a home device or an incoming signal from a station side device is detected, communication is continued with the activation state. After the end of communication, power supply and stop are periodically repeated.

[0016] This allows the subscriber unit to reduce the power consumption during non-communication, thereby reducing the battery capacity and the price of the subscriber unit.

[0017]

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 4 shows a configuration example of the optical line terminal and the optical line terminal according to the present invention.

In this embodiment, the subscriber unit includes a switch 41 for switching between transmission and reception, an AGC amplifier circuit 42 for controlling the amplification degree according to the input level of the received signal and maintaining the output amplitude at an appropriate level, A timing extraction / synchronization circuit 43 that performs timing extraction and frame synchronization from a signal, and outputs 0/1 of a received signal from an output of the AGC amplifier circuit 42
Identification circuit 44 for performing identification, timing extraction synchronization circuit 43
A reception buffer circuit 46 for temporarily storing the received data in a burst form based on the timing extracted in step (1) and outputting the data at the original data rate, temporarily storing the transmission data and forming a burst in response to the timing extracted by the timing extraction synchronization circuit 43. A transmission buffer circuit 45 for transmitting data, and a speed / frame conversion circuit 48 for optical transmission connected to the transmission buffer circuit 45 and the reception buffer circuit 46
A home equipment interface circuit 49 for interfacing with the home equipment, an AGC amplifier circuit 42, a timing extraction synchronization circuit 43, an identification circuit 44, and a transmission buffer circuit 4.
5, a power supply circuit 50 for supplying power to each of the reception buffer circuit 46, the speed / frame conversion circuit 48, and the home device interface circuit 49, and a home device interface circuit 49, the speed / frame conversion circuit 48 during non-communication.
An activation control circuit 51 that periodically controls power supply or stop of an optical transmitting / receiving unit including an AGC amplifier circuit 42, a timing extraction synchronization circuit 43, an identification circuit 44, a transmission buffer circuit 45, and a reception buffer circuit 46 is provided.

The optical line terminal includes a switch 21 for switching between transmission and reception, an AGC amplifier circuit 22 for controlling the degree of amplification according to the input level of the received signal and maintaining the output amplitude at an appropriate level, timing extraction and frame synchronization. , An identification circuit 24 for identifying 0/1 of the received signal from the output of the AGC amplifier circuit 22, and temporarily storing burst-like reception data based on the timing extracted by the timing extraction synchronization circuit 23. A reception buffer circuit 26 for outputting data at the original data rate, a transmission buffer circuit 25 for temporarily storing transmission data and transmitting the data in bursts according to the clock of a clock circuit 27, and the transmission buffer circuit 25 and the reception buffer circuit 26, a speed / frame conversion circuit 28 for performing optical transmission.

Here, the feature of this embodiment is that the home equipment interface circuit 49,
Speed / frame conversion circuit 48 and AGC amplification circuit 4
2. A start-up control circuit 51 is provided for controlling the optical transmission and reception section including the timing extraction synchronization circuit 43, the identification circuit 44, the transmission buffer circuit 45, and the reception buffer circuit 46 to periodically supply and stop power. It is in. Here, the activation control circuit 51 receives a control signal from the station side device from the speed / frame conversion circuit 48, distinguishes between communication and non-communication, and stops power supply during non-communication.

FIG. 5 is a time chart for explaining the operation of the subscriber unit by the activation control circuit. During non-communication, the power supply and stop of the home device interface unit, speed / frame conversion unit, transmission / reception unit, etc. of the subscriber side device are periodically performed. At this time, if a communication state is established by calling or receiving, the power supply is continued and communication is performed. Thereafter, when the communication is terminated, the communication apparatus enters a non-communication state (standby state), and periodically controls power supply and stop of the subscriber device.

FIG. 6 shows an example of a transmission frame configuration and a time chart of power supply to the subscriber unit. When communication is established, the exchange of signals between the station-side device and the subscriber-side device is performed by alternately switching between transmission and reception in units of a burst cycle. In the downstream direction from the optical line terminal to the optical network unit, an optical signal in which signals to a plurality of optical network units are time-division multiplexed for each burst period is transmitted. In the uplink direction, each subscriber device transmits an uplink optical signal within a time domain assigned to each of the subscriber devices. The position of the upstream optical signal of each subscriber side device is designated by control from the station side device so that the upstream optical signals of the plurality of subscriber side devices do not collide with each other. As described above, one subscriber device operates only at a certain position within one burst frame, and only for a time corresponding to the number of branches. For this reason, the activation control circuit determines whether or not the operation timing of the own device is present or not based on a control signal from the station side device, and controls so as to suspend (supply the power supply) except for the operation timing of the own device.

Next, another configuration example of the start control will be described with reference to FIGS. In FIGS. 7 and 8, the home device interface unit 60 is connected to the home device interface circuit 49 of FIG.
The speed / frame converter 61 is a speed / frame converter 4
8, the power supply 63 corresponds to the power supply circuit 50, and the optical transceiver 62 includes the switch 41, the AGC amplifier circuit 42,
It corresponds to the one including the timing extraction synchronization circuit 43, the identification circuit 44, the transmission buffer circuit 45, and the reception buffer circuit 46.

FIG. 7 shows another example of the configuration of the startup control, which is different from that of FIG. 4, and the home controller interface unit 60, the speed / frame conversion unit 61, the optical transmission / reception by the startup control unit (1) 64 during non-communication. The power is periodically supplied to or stopped from the unit 62 as shown in FIG. In this case, when there is a call or an incoming call at the time of power supply, that is, at the time of activation, the power supply is continued and the communication state is established. At the end of the communication, the power supply to each unit is stopped, and the device enters a non-communication state. In FIG. 4, the control signal from the station side device is received from the speed / frame conversion circuit 48 to control communication and non-communication, and in this example, control is performed. Performs periodic power supply or stop control.

FIG. 8 shows another example of the configuration of the start control, in which two start control units, that is, a start control unit (2) 65 and a start control unit (3) 66, are provided.

The configuration shown in FIG. 8 includes a call detection section 67 and a call detection section 68, respectively, and performs start-up control based on the call detection or the call detection, and the call detection section 67 and the call detection The section 68 also controls the start of power supply stop. That is, in this example, during non-communication, power supply to the home device interface unit 60, the speed / frame conversion unit 61, and the optical transmission / reception unit 62 is stopped, and the activation control unit (3) 66 causes the call detection unit 6 to operate.
7. The power is periodically supplied or stopped to the incoming call detection unit 68 and the activation control unit (2) 65. Call detection section 67,
If there is a call or an incoming call during power supply to the incoming call detecting unit 68 and the activation control unit (2) 65, the outgoing call or incoming call is detected by the call detecting unit 67 and the incoming call detecting unit 68. When an outgoing call or an incoming call is detected, the activation control unit (2) 65
Supplies power to the in-home device interface unit 60, the speed / frame conversion unit 61, and the optical transmission / reception unit 62 to enter a communication state. In the communication state, the power supply to the call detection unit 67 and the call detection unit 68 is stopped. Although the configuration of FIG. 8 is more complicated than the configuration shown in FIG. 7, the call detection unit 67, the call detection unit 68, and the start control unit (2) 65 that periodically start and stop when non-communication is performed. Since the circuit scale is small as compared with the circuit scale of the home device interface unit 60, the speed / frame conversion unit 61, and the optical transmission / reception unit 62, the power consumption during non-communication can be reduced as compared with the example of FIG.

[0028]

As described above, in the optical transmission system of the present invention, the power consumption of the subscriber unit during communication can be reduced by controlling the activation control circuit by the subscriber unit. The subscriber unit may perform battery backup from the viewpoint of securing a lifeline. However, according to the present invention, the battery capacity for securing the same holding time can be reduced, so that the power supply device can be downsized. This has the effect of reducing the price of the subscriber device. In addition, power consumption control during non-communications is further reduced by separating power supply control to the optical transmission / reception unit etc. based on call detection or call detection from power supply control to the call detection unit and call detection unit. it can.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a point / multipoint optical transmission system.

FIG. 2 is a block diagram showing a configuration of a conventional station device and a subscriber device.

FIG. 3 is a transmission / reception diagram of a conventional example.

FIG. 4 is a block diagram showing a configuration of a station side device and a subscriber side device of the present invention.

FIG. 5 is a time chart of the operation of the subscriber device of the present invention.

FIG. 6 is a time chart showing the operation of a transmission frame and a subscriber device according to the present invention.

FIG. 7 is a diagram showing another example of start control.

FIG. 8 is a diagram showing another example of the start control.

[Explanation of symbols]

C station-side device M ₁ -M _n subscriber-side device S optical star coupler 21, 41 switch 22, 42 AGC amplifier circuit 23, 43 timing extraction synchronization circuit 24, 44 identification circuit 25, 45 transmission buffer circuit 26, 46 reception buffer Circuit 27 Clock circuit 28, 48 Speed / frame conversion circuit 29, 49 Home equipment interface circuit 50 Power supply circuit 51 Startup control circuit 60 Home equipment interface unit 61 Speed / frame conversion unit 62 Optical transmission / reception unit 63 Power supply 64, 65, 66 Start control Unit 67 Outgoing call detecting unit 68 Incoming call detecting unit

Claims (4)

[Claims] 1. One station-side device and n (n is a natural number) subscriber-side devices are connected to each other via an optical fiber, and the station-side device and the subscriber-side device are connected to each other. Bidirectional communication is performed in units of a burst period, and the burst period is determined by a time domain of a downlink signal from the optical line terminal to the subscriber side device and a temporal domain of an uplink signal from the subscriber side device to the optical network unit. The station-side device transmits a downlink signal to the subscriber-side device in a downlink signal time region to the subscriber-side device, and the subscriber-side device is assigned to each subscriber-side device. An optical transmission system for transmitting an uplink signal in a time domain, wherein the subscriber unit includes a start control unit for periodically supplying power to a transmission / reception unit. 2. The starting control means includes means for stopping the subscriber unit for a certain period of time during non-communication by a control signal included in a downlink signal from the station side unit.
Optical transmission system as described. 3. The subscriber unit includes: a call detecting unit;
First activation control means for supplying power to a transmission / reception unit when the outgoing call detection means or the incoming call detection means detects an outgoing call or an incoming call, the first activation control means comprising: 2. The optical transmission system according to claim 1, further comprising: a second activation control means for periodically supplying power to said first activation control means, said call detection means and said incoming call detection means. 4. The optical transmission system according to claim 1, wherein n subscriber units are accommodated in the optical line terminal via an optical star coupler.