JP2002217929A - Optical burst transmission reception control system and method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely cut off the optical output of an optical burst signal from a slave station unit, by surely and easily specifying the slave station unit which is making abnormal output of an optical burst signal. SOLUTION: A master station unit 1 is provided with an optical burst signal monitoring section 3, which monitors the abnormality of the optical burst signal transmitted from the slave station unit 7 and identifies the specific slave station unit which emits abnormal light of the optical burst signal. The master station unit 1 is also provided with a stop signal transmitting section 4, which transmits the optical burst stop signal to the specified slave station unit. The slave station unit 7 is provided with a stop signal monitoring section 10, which monitors the reception of the optical burst stop signal transmitted from the master station unit, 1 an optical burst signal cut-off section 8 and a stop command execution section 11. The optical burst signal cut-off section 8 cuts off transmission of the optical burst signal directed toward the master station unit 1. When the stop signal monitoring section 10 receives the optical burst stop signal, the stop command execution section 11 outputs a command to cut off the transmission of the optical burst signal from the slave station unit 7, at least towards the optical burst signal cut-off section 8.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a plurality of slave station devices sharing a transmission medium and a transmission band, a master station device controlling the allocation of a used transmission band of each slave station device, and The present invention relates to an optical burst transmission / reception control system and method for transmitting transmission information to a master station device based on allocation of a used transmission band by a master station device. The present invention relates to an optical burst transmission / reception control system and method capable of blocking.

[0002]

2. Description of the Related Art Conventionally, a plurality of slave stations share a transmission medium and a transmission band, and each slave station performs data transmission to a master station by controlling the bandwidth of the master station. -T Recommendation G. 983.1 (Broa
dband optical access systemsbased on Passive Optic
al Network (PON) 1998/10) Figure 5 / G.983.1-Gener
ic physical configuration of the Optical Distribut
n ONUs (Optical Netwo
rk Unit) and one OLT (Optical Line Terminatio)
n) are known.

In this optical network, a frame format shown in FIG. 2 (ITU-T Recommendation G. 983.1 (Fi
gure 11 / G.983.1-Frame format for 155.52 / 155.52 Mbi
t / sPON)) from the master station device to each slave station device (downward direction) or from each slave station device to the master station device (upward direction).
Is transmitting data to In this frame format, a fixed-length cell (ATM cell) having a downward direction of 53 bytes is used.
, And the upstream direction is assumed to be transmitted by a 56-byte fixed-length cell in which a 3-byte overhead is added to a 53-byte ATM cell.

[0004] A downstream frame is composed of 54 ATM cells and 2 monitoring control (PLOAM: Physical Layer O).
PLOAM cells are inserted at a cycle of 28 cells. P
LOAM cells are in accordance with ITU-T Recommendation G. 983.1 (Tabl
e 8 / G.983.1-Payload content of downstream PLOAMcel
As shown in l), "GRANT1" to "GRANT2" are assigned to the first PLOAM cell as the band allocation information.
7 ”is inserted, and“ GRA ”is inserted in the second PLOAM cell.
NT28 "to" GRANT54 "are inserted.

[0005] The upstream frame has 53 ATM cells, each of which forms a time slot. "GRANT1"-described in the above-mentioned PLOAM cell
“GRANT53” corresponds to each time slot.
The “GRANT” value is identification information associated with each slave station device, and each slave station device holds the associated identification information in advance. Therefore, each "GRANT1" ~
As "GRANT53", "GRAN53"
By inserting the "T" value, each slave station device can recognize the time slot position of the ATM cell to be transmitted by its own slave station device, thereby controlling the bandwidth allocation of each slave station device. become.

Here, when the slave station device transmits an optical burst signal in a time slot not allocated to the slave station device due to a failure of the slave station device or the like, an optical burst signal from another slave station device is transmitted. And the entire system will fail.

[0007] In order to prevent the occurrence of such a failure, for example, there is an optical signal output monitoring circuit of an optical transmission device shown in FIG. 6 (see Japanese Patent Application Laid-Open No. 10-224299). In FIG. 6, when the master station device detects an abnormality in the optical burst signal from the slave station device, the master station device transmits an optical transmission stop signal to the slave station device, thereby causing the slave station device to perform optical transmission. The stop signal detection unit 32 receives this optical transmission stop signal, and the transmission selection unit 33 stops transmission of transmission data to the electric / optical conversion module 36.

[0008] The monitor unit 34 monitors the optical output of the electrical / optical conversion module 36. Even if the transmission selection unit 33 stops transmitting the transmission data, the electrical / optical conversion module 36
When the light output itself does not stop due to abnormal light emission, the power supply to the electric / optical conversion module 36 by the power supply unit 35 is stopped, whereby the light output is reliably shut off.

On the other hand, in the optical subscriber system described in Japanese Patent Application Laid-Open No. 10-303817, an optical breaker is provided on the slave station side of the optical splitter, and this optical breaker causes an error in an optical burst signal from the slave station. When it is detected, the optical transmission line is shut off and the optical burst signal is stopped. Here, the optical splitter notifies the occurrence of an abnormality by transmitting a low-frequency optical signal to the master station device.

[0010]

However, in the above-described optical signal output monitoring circuit of the optical transmission device, when an abnormality occurs only in the optical transmission / reception unit of the electric / optical conversion module 36, the power supply is stopped. Although the optical output can be cut off, if an abnormality such as a failure occurs in the electrical / optical conversion module 36 itself, the electrical / optical conversion module 36 is monitored by the electrical signal instead of directly monitoring the optical signal. Therefore, monitoring cannot be performed reliably, and as a result, there has been a problem that the light output may not be cut off.

In the above-mentioned optical subscriber system, even if a failure or the like occurs in the slave station device, the optical output can be cut off by an optical breaker disposed outside the slave station device, but the master station can be shut down. Unless a low-frequency optical signal, that is, an optical signal of another wavelength is used for the apparatus, there is a problem that the master station apparatus cannot identify the slave station apparatus in which the abnormality has occurred.

[0012] The present invention has been made in view of the above,
A light that can reliably and easily specify a slave station that is performing an abnormal output of an optical burst signal from a plurality of slave stations, and can reliably shut off the optical output of the optical burst signal from the slave station. An object of the present invention is to obtain a burst transmission / reception control system and a method thereof.

[0013]

In order to achieve the above object, an optical burst transmission / reception control system according to the present invention comprises a plurality of slave stations sharing a transmission medium and a transmission band, and the master station apparatus including each slave station apparatus. In the optical burst transmission and reception control system in which each slave station device transmits transmission information to the master station device based on the assignment of the usage transmission band by the master station device, the master station device includes: An optical burst signal monitoring unit that monitors an abnormality of the optical burst signal transmitted from the slave station device and identifies a specific slave station device that is emitting abnormal light of the optical burst signal; and And a stop signal transmitting means for transmitting an optical burst stop signal for instructing stop of the optical burst signal, wherein the slave station device monitors the reception of the optical burst stop signal transmitted from the master station device. Signal monitoring means, optical burst signal interrupting means for interrupting transmission of an optical burst signal to the master station device, and when the stop signal monitoring means receives an optical burst stop signal, at least the optical burst signal interrupting means Control means for giving an instruction to interrupt the transmission of the optical burst signal from the slave station device.

According to the present invention, in the master station device, the optical burst signal monitoring means monitors the abnormality of the optical burst signal transmitted from the slave station device, and the specific slave device emitting abnormal light of the optical burst signal. The station apparatus is identified, and the stop signal transmitting means transmits an optical burst stop signal for instructing the specific slave station apparatus to stop the optical burst signal. On the other hand, in the slave station device, the stop signal monitoring unit monitors reception of the optical burst stop signal transmitted from the master station device, and the control unit, when the stop signal monitoring unit receives the optical burst stop signal, At least an instruction to cut off the transmission of the optical burst signal from the slave station device is given to the optical burst signal blocking means, and the transmission of the optical burst signal to the master station device is cut off.

In the optical burst transmission / reception control system according to the next invention, in the above invention, the optical burst signal monitoring means, when the abnormal optical burst signal is transmitted from a plurality of slave station devices, A slave station device that has not transmitted an optical burst signal is identified as the specific slave station device.

According to the present invention, when the abnormal optical burst signal is transmitted from a plurality of slave stations, the optical burst signal monitoring means may switch the specific slave station to another normal slave station. It is determined that there is an influence, and a slave station device that does not transmit the abnormal optical burst signal is identified as the specific slave station device.

In the optical burst transmission / reception control system according to the next invention, in the above-mentioned invention, the master station device transmits stop information for instructing each slave station device to stop transmission of uplink transmission information. Further comprising a transmitting unit, the optical burst signal monitoring unit, when the abnormal optical burst signal is transmitted from a single slave station device, the stop information transmitting unit, the upstream information by the single slave station device, The transmission of transmission information is instructed to stop, and the specific slave station device is identified based on uplink transmission information from each slave station device thereafter.

According to the present invention, when the abnormal optical burst signal is transmitted from a single slave station, the optical burst signal monitoring means determines whether the abnormal optical burst signal is transmitted from the single slave station by the stop information transmitting means. Instruct transmission stop of uplink transmission information, identify the specific slave station device based on uplink transmission information from each slave station device thereafter, for example, a slave station device that could read uplink transmission information. The device is identified as a specific slave station device.

In the optical burst transmission / reception control system according to the next invention, in the above invention, the master station device further includes identification information transmitting means for transmitting identification information for identifying each slave station device, and the optical burst signal The monitoring means transmits the identification information to each slave station device when it is not possible to read uplink transmission information from the single slave station device, and based on the return information from each slave station device, It is characterized in that a specific slave station device is identified.

According to this invention, when the optical burst signal monitoring means cannot read the upstream transmission information from each slave station device, it transmits the identification information to each slave station device, and The specific slave station device is identified based on the return information from the station device, that is, the slave station device which could not read the return information is assumed to have affected other slave station devices, Is identified as a specific slave station device.

In the optical burst transmission / reception control system according to the next invention, in the above invention, the master station device transmits stop information for instructing each slave station device to stop transmission of uplink transmission information. Transmitting means, and identification information transmitting means for transmitting identification information for identifying each slave station apparatus, wherein the optical burst signal monitoring means is configured to output the abnormal optical burst signal from a single slave station apparatus. If there is, the stop information transmitting means instructs to stop transmission of uplink transmission information by the single slave station device, and then transmits the identification information to the single slave station device after a fixed time, The specific slave station device is identified based on uplink transmission information from a single slave station device.

According to the present invention, when the abnormal optical burst signal is transmitted from a single slave station, the optical burst signal monitoring means controls the single slave station by the stop information transmitting means. Instruct the transmission stop of uplink transmission information by, after a certain time after transmitting the identification information to the single slave station device, if the single slave station device is a normal slave station device, Since it is impossible to return the identification information, the child station device that has returned the uplink transmission information from the single child station device is identified as the specific child station device.

In the optical burst transmission / reception control system according to the next invention, in the above invention, the optical burst signal cutoff means is provided on the master station device side at the last stage where the slave station device transmits an optical burst signal. It is an optical switch.

According to the present invention, the optical burst signal cutoff means is an optical switch provided on the master station device side at the final stage where the slave station device transmits an optical burst signal, and the optical switch is reliably provided at the final output stage. The optical burst signal is interrupted.

[0025] In the optical burst transmission / reception control system according to the next invention, in the above invention, the stop signal transmitting means transmits the optical burst stop signal continuously to the specific slave station device, and monitors the stop signal. The means is characterized in that when the optical burst stop signal transmitted from the master station device is received a predetermined number of times or more, the optical burst stop signal is identified as being received.

According to the present invention, the stop signal transmitting means continuously transmits the optical burst stop signal to the specific slave station apparatus, and the stop signal monitoring means transmits the optical burst stop signal from the master station apparatus. When the optical burst stop signal is received a predetermined number of times or more, it is determined that the optical burst stop signal has been received.

In the optical burst transmission / reception control method according to the next invention, a plurality of slave station devices share a transmission medium and a transmission band, and the master station device controls the allocation of the used transmission band of each slave station device. An optical burst transmission / reception control method in which a station device transmits transmission information to a master station device based on allocation of a used transmission band by the master station device, wherein the master station device transmits an optical burst signal transmitted from the slave station device. The optical burst signal monitoring step of monitoring the abnormality of the specific slave station apparatus that is emitting abnormal light of the optical burst signal, and for the specific slave station apparatus identified by the optical burst signal monitoring step, A stop signal transmitting step of transmitting an optical burst stop signal for instructing the stop of the optical burst signal, and a stop signal monitoring in which the slave station device monitors reception of the optical burst stop signal transmitted from the master station device. And extent, if the stop signal monitoring process receives the optical burst stop signal, characterized in that it comprises a blocking step of blocking the transmission of optical burst signal from at least child station.

According to this invention, in the optical burst signal monitoring step, the master station device monitors the optical burst signal transmitted from the slave station device for abnormality, and specifies that the optical burst signal emits abnormal light. Identifying a slave station device, and transmitting a light burst stop signal for instructing stop of the optical burst signal to the specific slave station device identified by the optical burst signal monitoring step, by the stop signal transmitting step, and stopping. By the signal monitoring step, the slave station device monitors the reception of the optical burst stop signal transmitted from the master station device, and by the blocking step, when the stop signal monitoring step receives the optical burst stop signal, at least the The transmission of the optical burst signal from the slave station device is cut off.

[0029] In the optical burst transmission / reception control method according to the next invention, in the above invention, the optical burst signal monitoring step includes the step of: when the abnormal optical burst signal is transmitted from a plurality of slave units, A first identification step of identifying a slave station device that has not transmitted an optical burst signal as the specific slave station device.

According to the present invention, when the abnormal optical burst signal is transmitted from a plurality of slave stations in the first identification step of the optical burst signal monitoring step, the abnormal optical burst signal is transmitted. A slave station device that is not present is identified as the specific slave station device.

In the optical burst transmission / reception control method according to the next invention, in the above invention, the optical burst signal monitoring step includes the step of stopping when the abnormal optical burst signal is transmitted from a single slave station device. A transmission stop step of stopping transmission of uplink transmission information by the single slave station device by an information transmission step; and after the transmission stop step, the identification based on uplink transmission information from the single slave station device. And a second identification step of identifying the slave station device.

According to the present invention, in the optical burst signal monitoring step, when the abnormal optical burst signal is transmitted from a single slave station device, the transmission stop step is performed by the stop information transmitting step. The transmission of the uplink transmission information by one slave station device is stopped, and by the second identification step,
After the transmission stopping step, a slave station device that could read, for example, uplink transmission information based on uplink transmission information from the single slave station device is identified as the specific slave station device. ing.

[0033] In the optical burst transmission / reception control method according to the next invention, in the above invention, the optical burst signal monitoring step includes the step of: when it is impossible to read upstream transmission information from the single slave station device. An identification information transmitting step of transmitting identification information for identifying each slave station device to each slave station device, and a third identification for identifying the specific slave station device based on return information from each slave station device with respect to the identification information And a step.

According to the present invention, in the optical burst signal monitoring step, when the identification information transmitting step cannot read the upstream transmission information from the single slave station apparatus, each slave station apparatus is set to The identification information to be identified is transmitted to each slave station device, and the third identification step identifies the specific slave station device based on return information from each slave station device with respect to the identification information, that is, reads the return information. It is assumed that the unsuccessful slave station device affects other slave station devices, and the slave station device is identified as a specific slave station device.

In the optical burst transmission / reception control method according to the next invention, in the above invention, the optical burst signal monitoring step includes the step of: when the abnormal optical burst signal is transmitted from a single slave station device, A transmission stop step of stopping transmission of uplink transmission information by one slave station apparatus, and an identification information transmission step of transmitting the identification information to the single slave station apparatus after a fixed time after the transmission stop step; And a fourth identification step of identifying the specific slave station device based on uplink transmission information from the single slave station device.

According to the invention, in the optical burst signal monitoring step, when the abnormal optical burst signal is transmitted from a single slave station, the transmission stopping step is performed by the single slave station. Stop transmission of upstream transmission information,
In the identification information transmitting step, after the transmission stopping step, the identification information is transmitted to the single slave station apparatus after a predetermined time, and the fourth identification step transmits the uplink transmission from the single slave station apparatus. Identifying the specific slave station device based on the information,
That is, when the single slave station device is a normal slave station device, it cannot return the identification information. Therefore, the slave device that has returned the uplink transmission information from the single slave station device. The station device identifies the specific slave station device.

In the optical burst transmission / reception control method according to the next invention, in the above invention, in the stop signal transmitting step, the optical burst stop signal is continuously transmitted to the specific slave station device, and the stop signal monitoring is performed. The step is characterized in that when the optical burst stop signal transmitted from the master station device is received a predetermined number of times or more, it is determined that the optical burst stop signal has been received.

According to the present invention, the stop signal transmitting step continuously transmits the optical burst stop signal to the specific slave station apparatus, and the stop signal monitoring step is transmitted from the master station apparatus. When the optical burst stop signal is received a predetermined number of times or more, it is determined that the optical burst stop signal has been received.

[0039]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of an optical burst transmission / reception control system and method according to the present invention will be described below with reference to the accompanying drawings.

Embodiment 1 First, a first embodiment of the present invention will be described. FIG. 1 is a diagram showing a schematic configuration of an optical burst transmission / reception control system according to Embodiment 1 of the present invention. In FIG. 1, the optical burst transmission / reception control system includes a master station device 1 and a plurality of slave station devices 7 (7-1 to 7-1).
7-n) are connected via the optical splitter 6. The master station device 1 and each slave station device 7 perform data transmission using the downlink format and the uplink format shown in FIG.

The master station device 1 has a management signal transmitting unit 2, an optical burst signal monitoring unit 3, a notification unit 3a, a stop signal transmitting unit 4, and an optical transmitting and receiving unit 5. The management signal transmission unit 2 transmits a management signal for identifying a slave station device that has abnormally emitted light. The optical burst signal monitoring unit 3 monitors whether an optical burst signal is transmitted in a time slot not allocated to the slave station device, and identifies a slave station device that has abnormally emitted light based on the monitoring result. . The stop signal transmitting unit 4 transmits an optical burst stop signal for stopping the optical burst signal to the slave station device that has transmitted the optical burst signal in the unallocated time slot. The optical transmitting and receiving unit 5 includes a slave station device 7
And transmission / reception processing of the optical burst signal between them. Notification section 3
“a” notifies the operator of the master station apparatus 1 of an alarm indicating that a specific slave station apparatus has abnormally emitted light under the instruction of the optical burst signal monitoring unit 3. The optical splitter 6 multiplexes and demultiplexes an optical burst signal transmitted and received between the master station device 1 and each slave station device 7.

The slave station device 7 includes an optical burst signal cutoff unit 8,
It has an optical transmission / reception unit 9, a stop signal monitoring unit 10, and a stop instruction execution unit 11. The optical burst signal cutoff unit 8 is arranged on the optical splitter 6 side of the optical transmission / reception unit 9 and cuts off the optical burst signal according to an instruction from the stop command execution unit 11. The optical transmission / reception unit 9 performs transmission / reception processing of an optical burst signal with the master station device 1. The stop signal monitoring unit 10 monitors whether or not the optical burst stop signal sent from the master station device 1 has been received. The stop command execution unit 11 analyzes the optical burst stop signal acquired by the stop signal monitoring unit 10 and instructs the optical burst signal cutoff unit 8 to cut off the optical burst signal based on the analysis result.

As described above, the master station device 1 transmits the GR in the PLOAM cell in the downlink format shown in FIG.
Band allocation of each slave station device 7 is performed based on the ANT value, and each slave station device 7 transmits data to the master station device 1 according to the band assignment.

Here, FIG. 3 and FIG. 4 are flow charts showing the process of shutting down the optical burst signal when there is a slave station in which abnormal light emission has occurred such as transmitting an optical burst signal to an unallocated time slot. This will be described with reference to FIG.

In FIG. 3, first, the optical burst signal monitoring unit 3 loses cell synchronization (LCD) from the optical burst signal.
Alternatively, a loss of input (LOS) from the slave station device is detected (step S101). Loss of cell synchronization (LCD) or loss of input (LOS) from a slave station device is caused by ITU-T Recommendation G.983.1.
This is the alarm defined in Table 15 / G.983.1 Items detected at OLT.

Thereafter, the optical burst signal monitoring unit 3 determines whether an LCD or LOS has been generated from another slave station device (step S102). If an LCD or LOS is also generated from another slave station device (step S102, YES), a slave station device where no LCD or LOS is generated is identified as a slave station device that emits abnormal light (step S103). ).

Thereafter, the stop signal transmitting unit 4 transmits an optical burst stop signal to the slave station identified by the optical burst signal monitoring unit 3 (Step S104). This optical burst stop signal is stored in the header or information area (payload) of the downstream ATM cell. The optical burst stop signal is continuously transmitted to the slave station device a predetermined number of times.
The slave station device protects the signal that continuously receives the optical burst stop signal, thereby preventing the optical burst signal from being cut off by mistake.

Thereafter, the optical burst signal monitoring unit 3 issues an alarm to the notifying unit 3a indicating that the identified slave station apparatus has abnormally emitted light, and notifies the operator of the master station apparatus 1 of that. (Step S105), this processing ends.

On the other hand, in FIG. 4, the stop signal monitoring section 10 of the slave station device 7 monitors the optical burst signal sent from the master station device 1 (step S201), and determines whether or not the optical burst stop signal has been received. Is determined (step S202). When an optical burst stop signal is received (step S202,
In the case of YES), an optical burst stop signal is output to the stop command execution unit 11, and the stop command execution unit 11 instructs the optical burst signal cutoff unit 8 to cut off the optical burst signal, and transmits the signal from the optical transmission / reception unit 9. The optical output of the optical burst signal to be performed is cut off (step S203), and this processing ends.

The determination of the reception of the optical burst stop signal by the stop signal monitoring unit 10 in step S202 is based on the fact that the stop signal transmitting unit 4 continuously transmits the optical burst stop signal as described above. When the optical burst stop signal is received more than the number of times, it is determined that the optical burst stop signal has been received, and the optical burst stop signal is transmitted to the stop command execution unit 11. As a result, reception of an erroneous optical burst stop signal is prevented.

In this manner, only one specific slave station device that emits abnormal light is identified as normal without generating an LCD or LOS alarm, and the other slave station devices are identified as LCD or LO.
When it is determined that the alarm of S has occurred, one specific slave station device that does not issue the alarm is identified as a slave station device that emits abnormal light, and the one slave station device that abnormally emits light is identified. The optical burst signal from the slave station device can be reliably shut off.

By the way, there is a case where an LCD or LOS is generated only in one specific slave station device due to an optical burst signal from one slave station device that abnormally emits light. In this case, when one specific slave station device that emits abnormal light emits abnormally in the time slot of another slave station device, the uplink data of the other slave station device collides with the optical burst signal that emits abnormal light. Because you do. In this case, a case will be described in which the uplink data from the specific slave station device that has abnormally emitted light can be normally read.

That is, returning to FIG. 3, if no LCD or LOS has been generated from another slave station device (step S102, NO), that is, if only one slave station device has generated LCD or LOS. In this case, the management signal transmitting unit 2 sends a “Deactivate_PON_ID message” (ITU recommendation) to the slave station device where the LCD or LOS alarm has occurred.
A message defined in 8.3.8.2.1 Downstream message formats of G.983.1 is transmitted (step S111), and the transmission of uplink data by this slave station device is stopped.

After that, the optical burst signal monitoring unit 3
It is determined whether it is possible to read the information of the uplink data of the slave station device where the alarm of D or LOS has occurred (step S112). If the information of the uplink data can be read (step S112, YES), the information of the uplink data is read (step S114). 8.3.8.2.1 Downstream message of ITU recommendation G.983.1
Since the slave station information (ID) is described as a message format defined in formats, by identifying this ID, a specific slave station device emitting a burst optical signal of abnormal light emission to another slave station device Can be specified.

Thereafter, as described above, the stop signal transmitting unit 4 transmits an optical burst stop signal to the slave station device emitting abnormal light identified by the optical burst signal monitoring unit 3 (step S104). This optical burst stop signal is stored in the header or information area (payload) of the downstream ATM cell. The optical burst stop signal is continuously transmitted to the slave station device a predetermined number of times. The slave station device performs signal reception protection for continuously receiving the optical burst stop signal,
This prevents the optical burst signal from being cut off by mistake.

Thereafter, the optical burst signal monitoring unit 3 issues an alarm to the notifying unit 3a that the identified slave unit has abnormally emitted light, and notifies the operator of the master unit 1 of that. (Step S105), this processing ends.

On the other hand, in FIG. 4, the stop signal monitoring section 10 of the slave station device 7 monitors the optical burst signal sent from the master station device 1 (step S201), and determines whether or not the optical burst stop signal has been received. Is determined (step S202). When an optical burst stop signal is received (step S202,
In the case of YES), an optical burst stop signal is output to the stop command execution unit 11, and the stop command execution unit 11 instructs the optical burst signal cutoff unit 8 to cut off the optical burst signal, and transmits the signal from the optical transmission / reception unit 9. The optical output of the optical burst signal to be performed is cut off (step S203), and this processing ends.

The determination of the reception of the optical burst stop signal by the stop signal monitoring unit 10 in step S202 is based on the fact that the stop signal transmitting unit 4 continuously transmits the optical burst stop signal as described above. When the optical burst stop signal is received more than the number of times, it is determined that the optical burst stop signal has been received, and the optical burst stop signal is transmitted to the stop command execution unit 11. As a result, reception of an erroneous optical burst stop signal is prevented.

In this way, one slave station device that emits abnormal light emits abnormal light in the time slot of another slave station device, so that the uplink data of the other slave station device becomes abnormal. In a case where an LCD or LOS occurs only in the other slave station device due to collision with the emitted optical burst signal, the uplink data from one slave station device that abnormally emits light is transmitted to the other slave station device. When reading can be performed normally through the time slot of one slave station device, one slave station device that abnormally emits light is specified, and the optical output of the optical burst signal from this slave station device is cut off. ing.

On the other hand, if it is determined in step S112 that the uplink data cannot be read from one slave station device that has abnormally emitted light (step S112, NO), the optical burst signal monitoring unit 3 sets the PLO in the downlink frame to a lower level.
Using an AM cell, each slave station device 7 receives a message “GRAN
T "is transmitted, and for each slave station device 7, uplink data is confirmed from each slave station device 7, and a slave station device that could not read the uplink data is identified as a slave station device that has abnormally emitted light. (Step S113).

Thereafter, as described above, the stop signal transmitting unit 4 transmits the optical burst stop signal to the slave station device emitting abnormal light identified by the optical burst signal monitoring unit 3 (step S104). This optical burst stop signal is stored in the header or information area (payload) of the downstream ATM cell. The optical burst stop signal is continuously transmitted to the slave station device a predetermined number of times. The slave station device performs signal reception protection for continuously receiving the optical burst stop signal,
This prevents the optical burst signal from being cut off by mistake.

Thereafter, the optical burst signal monitoring unit 3 issues an alarm to the notifying unit 3a indicating that the identified slave station device has abnormally emitted light, and notifies the operator of the master station device 1 of that. (Step S105), this processing ends.

On the other hand, in FIG. 4, the stop signal monitoring unit 10 of the slave station device 7 monitors the optical burst signal transmitted from the master station device 1 (step S201), and determines whether or not the optical burst stop signal has been received. Is determined (step S202). When an optical burst stop signal is received (step S202,
In the case of YES), an optical burst stop signal is output to the stop command execution unit 11, and the stop command execution unit 11 instructs the optical burst signal cutoff unit 8 to cut off the optical burst signal, and transmits the signal from the optical transmission and reception unit 9. The optical output of the optical burst signal to be performed is cut off (step S203), and this processing ends.

As described above, the stop signal monitoring unit 10 determines that the optical burst stop signal is received by the stop signal monitoring unit 10 in step S202 because the stop signal transmitting unit 4 continuously transmits the optical burst stop signal. When the optical burst stop signal is received more than the number of times, it is determined that the optical burst stop signal has been received, and the optical burst stop signal is transmitted to the stop command execution unit 11. As a result, reception of an erroneous optical burst stop signal is prevented.

As described above, one slave station device that emits abnormal light emits abnormal light with respect to the time slot of another slave station device, so that the uplink data of the other slave station device becomes abnormal. In a case where an LCD or LOS occurs only in the other slave station device due to collision with the emitted optical burst signal, the uplink data from one slave station device that abnormally emits light may not be normally read. Even if it is not possible, one slave station device that abnormally emits light is specified, and the optical output of the optical burst signal from this slave station device is cut off.

The optical burst signal cutoff section 8 shown in the first embodiment is constituted by an optical switch or the like, and physically cuts off the optical transmission line. Further, the stop signal monitoring unit 10 is configured by a simple circuit such as a cell synchronization circuit to monitor the optical burst stop signal. As a result, even if a failure or the like occurs in the slave station device itself, the stop signal monitoring unit 1
By 0, the optical burst signal can be cut off.

In the first embodiment, the wavelength of the optical burst stop signal is set to the same wavelength as that of the optical burst signal and the header or information in the downlink data in the optical burst signal is transmitted to the slave station device. Although the data is stored and transmitted in the area (payload), the present invention is not limited to this, and the optical burst stop signal may be transmitted with the wavelength of the optical burst stop signal being different from the wavelength of the optical burst signal. Good.

Embodiment 2 Next, a second embodiment of the present invention will be described. In the first embodiment described above,
Although the optical burst signal is cut off when the LCD or LOS is detected, in the second embodiment,
"Deactivate_P" to stop transmission of uplink data
After transmitting the ON_ID message to the specific slave station that has issued the alarm, if the transmission of uplink data from the specific slave station does not stop, the output of the optical burst signal by this specific slave station is performed. It is forcibly stopped.

The structure of the second embodiment is the same as that of the first embodiment.
Is the same as Here, with reference to a flowchart shown in FIG. 5, a description will be given of a process of forcibly blocking an optical burst signal in the optical burst transmission / reception control system.

In FIG. 5, first, as in steps S101 to S105 shown in FIG. 3, an LCD or LOS is detected, and it is determined whether or not an LCD or LOS is generated from another slave station. If the LCD or LOS is also generated from another slave station device, the LCD or LOS
The slave station device in which is not generated is recognized as a slave station device that is emitting abnormal light, an optical burst stop signal is transmitted to the slave station device, and an optical burst signal from the slave station device is cut off. An alarm is generated to the effect that the slave station device has abnormally emitted light, and the operator of the master station device 1 is notified of that (steps S301 to S305).

On the other hand, the LCD or the L
When no OS has occurred (step S302, NO)
First, the stop signal transmitting unit 4 sends “Deactivate_P” to a specific slave station device in which this LCD or LOS has occurred due to the above-mentioned failure of the LCD or LOS.
ON_ID message ”(step S306). As a result, when the slave station device that has received the “Deactivate_PON_ID message” is normal, the optical burst signal is not transmitted.

Thereafter, this specific slave station apparatus is referred to as “Deacti
After receiving the “vate_PON_ID message” and waiting for a certain period of time to process the “vate_PON_ID message”, “GRANT” is transmitted to the specific slave station device that transmitted this message (step S3).
07).

After that, the optical burst signal monitoring section 3 determines whether or not the uplink data has been received from a specific slave station device (step S308). When the uplink data is received (step S308, YES), it is determined that the specific slave station device cannot normally perform the process for “Deactivate_PONID_message” and that the specific slave station device is abnormally emitting light. , Instructs the stop signal transmitting unit 4 to transmit an optical burst stop signal to a specific slave station device, and the stop signal transmitting unit 4 transmits an optical burst stop signal to the specific slave station device (step S304). As a result, transmission of the optical burst signal to the specific slave station device that is emitting abnormal light is reliably shut off.

On the other hand, when the uplink data from the specific slave station device is not received (step S308, NO), it is determined that the specific slave station device has normally stopped the transmission of the uplink data, and the optical burst is determined. The process proceeds to step S305 without transmitting the stop signal.

Thereafter, the optical burst signal monitoring unit 3 issues an alarm to the notifying unit 3a indicating that the identified slave station apparatus has abnormally emitted light, and notifies the operator of the master station apparatus 1 of the alarm. (Step S305), this processing ends.

The optical burst stop signal by the stop signal monitoring unit 10 in step S304 is continuously transmitted a predetermined number of times. When the stop signal monitoring unit 10 receives the optical burst stop signal more than a predetermined number of times, the optical burst stop signal is output. It is determined that a signal has been received, and an optical burst stop signal is sent to the stop command execution unit 11. As a result, reception of an erroneous optical burst stop signal is prevented.

In this manner, the processing for the “Deactivate_PON_ID message” sent to the slave station device where the LCD or LOS has occurred or the slave station device that simply wants to stop the transmission of the uplink data is sent. Even when the transmission is not performed normally and the transmission of uplink data by the specific slave station device does not stop, the optical burst signal from the specific slave station device can be reliably shut off.

[0078]

As described above, according to the present invention, in the master station apparatus, the optical burst signal monitoring means monitors the optical burst signal transmitted from the slave station apparatus for an abnormality.
A specific slave station device emitting abnormal light of the optical burst signal is identified, and the stop signal transmitting means transmits an optical burst stop signal to instruct the specific slave station device to stop the optical burst signal. On the other hand, in the slave station device, the stop signal monitoring unit monitors reception of the optical burst stop signal transmitted from the master station device, and the control unit, when the stop signal monitoring unit receives the optical burst stop signal, At least, it instructs the optical burst signal interrupting means to interrupt the transmission of the optical burst signal from the slave station apparatus, and interrupts the transmission of the optical burst signal to the master station apparatus. Even if a signal is not used, the optical burst signal from the slave station device that emits the abnormal light can be specified reliably and easily, and the specified optical burst signal can be surely cut off.

According to the next invention, when the abnormal optical burst signal is transmitted from a plurality of slave units, the optical burst signal monitoring means may determine that the specific slave unit is normal to another slave unit. It is determined that the abnormal optical burst signal has been transmitted, and the slave station device that has not transmitted the abnormal optical burst signal is identified as the specific slave station device. There is an effect that an optical burst signal from a specific slave station device can be cut off.

According to the next invention, when the abnormal optical burst signal is transmitted from a single slave station device, the optical burst signal monitoring means controls the single slave station device by the stop information transmitting means. A slave station device that has instructed to stop transmission of uplink transmission information by, and identified the specific slave station device based on uplink transmission information from each slave station device thereafter, for example, was able to read uplink transmission information Is identified as a specific slave station device, so that there is an effect that an optical burst signal from a specific slave station device that abnormally emits light can be reliably and easily shut off.

According to the next invention, when the optical burst signal monitoring means cannot read the upstream transmission information from each slave station device, the optical burst signal monitoring means transmits the identification information to each slave station device. Identify the specific slave station device based on the return information from the slave station device, that is, assume that the slave station device that could not read the return information has affected other slave station devices, Since the device is identified as a specific slave station device, there is an effect that an optical burst signal from a specific slave station device that abnormally emits light can be reliably and easily shut off.

According to the next invention, when the abnormal optical burst signal is transmitted from a single slave station device, the optical burst signal monitoring means causes the stop information transmitting means to stop the single slave station. When the device instructs the device to stop transmitting upstream transmission information, and thereafter transmits the identification information to the single slave device after a certain period of time, and the single slave device is a normal slave device. Since it is not possible to return the identification information, the slave station that has returned the upstream transmission information from the single slave station is identified as the specific slave station. In addition, it is possible to reliably and easily shut off the optical burst signal from the specific slave station device that is abnormally emitting light.

According to the next invention, the optical burst signal cutoff means is an optical switch provided on the master station device side at the last stage in which the slave station device transmits an optical burst signal. Since the optical burst signal is surely cut off, there is an effect that the optical burst signal from the specific slave station device that is emitting abnormal light can be surely cut off.

According to the next invention, the stop signal transmitting means continuously transmits the optical burst stop signal to the specific slave station apparatus, and the stop signal monitoring means transmits the optical burst stop signal from the master station apparatus. When the optical burst stop signal is received a predetermined number of times or more, it is determined that the optical burst stop signal has been received, so that the optical burst stop signal can be protected from being erroneously identified. Play.

According to the next invention, in the optical burst signal monitoring step, the master station device monitors the optical burst signal transmitted from the slave station device for abnormalities, and emits abnormal light of the optical burst signal. Identify a specific slave station device, by a stop signal transmission step, transmit an optical burst stop signal to instruct the stop of the optical burst signal to the specific slave station device identified by the optical burst signal monitoring step, By a stop signal monitoring step, the slave station device monitors the reception of the optical burst stop signal transmitted from the master station device,
When the stop signal monitoring step receives the optical burst stop signal by the cutoff step, at least the transmission of the optical burst signal from the slave station device is cut off, so that the abnormal light emission is reliably and easily performed. This has the effect that the optical burst signal from the slave station device can be cut off.

According to the next invention, when the abnormal optical burst signal is transmitted from a plurality of slave units in the first identification step of the optical burst signal monitoring step, the abnormal optical burst signal is transmitted. Since the non-existing slave station device is identified as the specific slave station device, it is possible to reliably and easily cut off the optical burst signal from the specific slave station device that abnormally emits light. Play.

According to the next invention, in the optical burst signal monitoring step, when the abnormal optical burst signal is transmitted from a single slave station device, the transmission stop step is performed by the stop information transmitting step. The transmission of the uplink transmission information by the single slave station device is stopped, and after the transmission stop step, the second identification step is performed, for example, based on the uplink transmission information from the single slave station device, for example, the uplink transmission. Since the slave station device from which information can be read is identified as the specific slave station device, it is possible to reliably and easily shut off the optical burst signal from the specific slave station device that abnormally emits light. This has the effect that it can be performed.

According to the next invention, in the optical burst signal monitoring step, when the identification information transmitting step cannot read the upstream transmission information from the single slave station apparatus, Transmitting identification information to each slave station device to identify the specific slave station device based on the return information from each slave station device with respect to the identification information, that is, reading the return information by the third identification step. It is assumed that the slave station device that could not perform has affected other slave station devices, and the slave station device is identified as a specific slave station device, so that abnormal light emission is reliably and easily performed. There is an effect that an optical burst signal from a specific slave station device can be cut off.

According to the next invention, in the optical burst signal monitoring step, when the abnormal optical burst signal is transmitted from a single slave station device, the transmission stopping step includes the step of: By stopping the transmission of the uplink transmission information, by the identification information transmission step, after the transmission stop step,
After a predetermined time, the identification information is transmitted to the single slave station device, and the fourth identification step identifies the specific slave station device based on uplink transmission information from the single slave station device. In other words, when the single slave station device is a normal slave station device, since the identification information cannot be returned, the uplink transmission information from the single slave station device is returned. Since the specific slave station device is distinguished from the specific slave station device, it is possible to reliably and easily cut off the optical burst signal from the specific slave station device that abnormally emits light.

According to the next invention, the stop signal transmitting step continuously transmits the optical burst stop signal to the specific slave station apparatus, and the stop signal monitoring step transmits the optical burst stop signal from the master station apparatus. When the optical burst stop signal is received a predetermined number of times or more, it is determined that the optical burst stop signal has been received, so that the optical burst stop signal can be protected from being erroneously identified. Play.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of an optical burst transmission / reception control system according to a first embodiment of the present invention.

FIG. 2 is a diagram illustrating uplink and downlink frame formats between a master station device and a slave station device illustrated in FIG. 1;

FIG. 3 is a flowchart showing a procedure of an optical burst transmission / reception control system shown in FIG.

FIG. 4 is a flowchart showing a procedure of an optical burst signal cutoff process at the slave station device side by the optical burst transmission / reception control system shown in FIG. 1;

FIG. 5 is a flowchart showing a procedure of an optical burst transmission / reception control system according to a second embodiment of the present invention in which a master station device cuts off an optical burst signal.

FIG. 6 is a diagram illustrating a configuration of a slave station device side according to a conventional optical burst transmission / reception control system.

[Explanation of symbols]

Reference Signs List 1 master station device, 2 management signal transmission unit, 3 optical burst signal monitoring unit, 3a notification unit, 4 stop signal transmission unit, 5, 9
Optical transmitting / receiving unit, 6 Optical splitter, 7, 7-1 to 7-n
Slave station device, 8 optical burst signal cutoff unit, 10 stop signal monitoring unit, 11 stop instruction execution unit.

Continued on the front page (72) Hiroshi Ichigase, 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Mitsui Electric Co., Ltd. (72) Yuto Uemura 2-3-2, Marunouchi, Chiyoda-ku, Tokyo F term in Ryo Denki Co., Ltd. (reference) 5K002 AA05 DA03 DA05 DA12 EA03 EA05 EA06 5K028 AA14 BB08 CC02 CC05 DD01 DD02 KK33 PP11 QQ00 5K033 AA06 CA11 CC01 DA01 DA15 DB01 DB22 EA04 EB03 EB08 5K04 2 NA01

Claims (13)

[Claims] 1. A plurality of slave stations share a transmission medium and a transmission band, a master station controls allocation of a use transmission band of each slave station, and each slave station uses transmission by the master station. In an optical burst transmission / reception control system that transmits transmission information to a master station device based on band allocation, the master station device monitors an abnormality of an optical burst signal transmitted from the slave station device, and Optical burst signal monitoring means for identifying a specific slave station device emitting abnormal light; stop signal transmitting means for transmitting an optical burst stop signal for instructing the specific slave station apparatus to stop the optical burst signal; A slave signal monitoring unit that monitors reception of an optical burst stop signal transmitted from the master station device; and an optical burst signal that interrupts transmission of an optical burst signal to the master station device. Disconnecting means, and when the stop signal monitoring means receives an optical burst stop signal, control means for instructing at least the optical burst signal blocking means to cut off the transmission of the optical burst signal from the slave station device, An optical burst transmission / reception control system comprising: 2. The optical burst signal monitoring means, when the abnormal optical burst signal is transmitted from a plurality of slave stations, identifies the slave station not transmitting the abnormal optical burst signal to the specific station. The optical burst transmission / reception control system according to claim 1, wherein the system is identified as a slave station device. 3. The master station device further comprises stop information transmitting means for transmitting stop information for instructing each slave station device to stop transmission of uplink transmission information, and the optical burst signal monitoring means comprises: When an abnormal optical burst signal is transmitted from a single slave station device, the stop information transmitting unit instructs the single slave station device to stop transmission of uplink transmission information, and thereafter each slave station device. The optical burst transmission / reception control system according to claim 1 or 2, wherein the specific slave station device is identified based on uplink transmission information from the mobile station. 4. The master station apparatus further includes identification information transmitting means for transmitting identification information for identifying each slave station apparatus, and the optical burst signal monitoring means includes an upstream signal from the single slave station apparatus. When transmission information cannot be read, the identification information is transmitted to each slave station device, and the specific slave station device is identified based on return information from each slave station device. 3. The optical burst transmission / reception control system according to 3. 5. A stop information transmitting means for transmitting stop information for instructing each slave station device to stop transmission of uplink transmission information, and transmitting identification information for identifying each slave station device. The optical burst signal monitoring means further comprises: when the abnormal optical burst signal is transmitted from a single slave station device, the stop information transmitting means sets the single slave Instruct the transmission stop of the upstream transmission information by the station device, and thereafter, after a certain period of time, transmit the identification information to the single slave station device, based on the uplink transmission information from the single slave station device The optical burst transmission / reception control system according to claim 1, wherein the specific slave station device is identified by the control unit. 6. The optical switch according to claim 1, wherein said optical burst signal cut-off means is an optical switch provided on said master station apparatus at a final stage where said slave station apparatus transmits an optical burst signal. An optical burst transmission / reception control system according to any one of the preceding claims. 7. The stop signal transmitting unit continuously transmits the optical burst stop signal to the specific slave station device, and the stop signal monitoring unit includes an optical burst stop signal transmitted from the master station device. The optical burst transmission / reception control system according to any one of claims 1 to 6, wherein when the optical burst is received a predetermined number of times or more, the optical burst stop signal is identified as being received. 8. A plurality of slave station apparatuses share a transmission medium and a transmission band, a master station apparatus controls allocation of a use transmission band of each slave station apparatus, and each slave station apparatus uses transmission by the master station apparatus. An optical burst transmission / reception control method for transmitting transmission information to a master station device based on band allocation, wherein the master station device monitors an abnormality of an optical burst signal sent from the slave station device, and An optical burst signal monitoring step for identifying a specific slave station that is emitting abnormal light; and an optical burst for instructing the specific slave station identified by the optical burst signal monitoring step to stop an optical burst signal. A stop signal transmitting step of transmitting a stop signal; a stop signal monitoring step in which the slave station device monitors reception of an optical burst stop signal transmitted from the master station device; When receiving the signal, the optical burst reception control method characterized by comprising: a blocking step of blocking the transmission of optical burst signal from at least child station. 9. The optical burst signal monitoring step, in the case where the abnormal optical burst signal is transmitted from a plurality of slave stations, identifies the slave station that has not sent the abnormal optical burst signal to the specific station. 9. The optical burst transmission / reception control method according to claim 8, further comprising a first identification step of identifying the device as a slave station device. 10. The optical burst signal monitoring step, wherein, when the abnormal optical burst signal is transmitted from a single slave station, uplink transmission by the single slave station by the stop information transmitting step. A transmission stop step of stopping transmission of information; and after the transmission stop step, a second step of identifying the specific slave station apparatus based on uplink transmission information from the single slave station apparatus.
The optical burst transmission / reception control method according to claim 8 or 9, comprising: an identification step. 11. The optical burst signal monitoring step includes: in a case where it is not possible to read uplink transmission information from the single slave station, assigns identification information identifying each slave station to each slave station. 11. An identification information transmitting step of transmitting, and a third identification step of identifying the specific slave station device based on return information from each slave station device for the identification information. 11. The optical burst transmission / reception control method according to any one of the above. 12. The optical burst signal monitoring step, wherein, when the abnormal optical burst signal is transmitted from a single slave station, the single slave station stops transmitting uplink transmission information. A transmission stop step, after the transmission stop step, an identification information transmission step of transmitting the identification information to the single slave station device after a predetermined time, and an uplink transmission information from the single slave station device. The optical burst transmission / reception control method according to claim 8 or 9, further comprising: a fourth identification step of identifying the specific slave station device based on the information. 13. The stop signal transmitting step transmits the optical burst stop signal continuously to the specific slave station device, and the stop signal monitoring step includes an optical burst stop signal transmitted from the master station device. 13. The optical burst transmission / reception control method according to any one of claims 8 to 12, wherein, when the optical burst stop signal is received a predetermined number of times or more, the optical burst stop signal is received.