WO2014184955A1 - 光伝送システム - Google Patents
光伝送システム Download PDFInfo
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- WO2014184955A1 WO2014184955A1 PCT/JP2013/063817 JP2013063817W WO2014184955A1 WO 2014184955 A1 WO2014184955 A1 WO 2014184955A1 JP 2013063817 W JP2013063817 W JP 2013063817W WO 2014184955 A1 WO2014184955 A1 WO 2014184955A1
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- WIPO (PCT)
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- transponder
- maintenance information
- optical
- transmission path
- multiframe
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/03—Arrangements for fault recovery
- H04B10/032—Arrangements for fault recovery using working and protection systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/14—Monitoring arrangements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
- H04Q11/0062—Network aspects
- H04Q11/0066—Provisions for optical burst or packet networks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/16—Time-division multiplex systems in which the time allocation to individual channels within a transmission cycle is variable, e.g. to accommodate varying complexity of signals, to vary number of channels transmitted
- H04J3/1605—Fixed allocated frame structures
- H04J3/1652—Optical Transport Network [OTN]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
- H04Q11/0062—Network aspects
- H04Q2011/0079—Operation or maintenance aspects
- H04Q2011/0081—Fault tolerance; Redundancy; Recovery; Reconfigurability
Definitions
- the present invention relates to an optical transmission system in which a maintenance apparatus using two types of maintenance switching protocols coexists by incorporating a maintenance switching protocol into an OTU overhead of an optical transmission unit (Optical channel Transport Unit: OTU) frame.
- OTU optical transmission unit
- FIG. 10 shows a schematic diagram of a redundant optical transmission system.
- the output port of the customer transmission device 101 which is a network protection device (NPE) installed in the first land section is connected to the optical coupler 102.
- NPE network protection device
- One of the output ports of the optical coupler 102 is connected to the transponder 103 and the other is connected to the optical switch 106.
- the optical switch 106 has an input port connected to the optical coupler 102 and the optical switch 208, and can select one as an input source in accordance with a control signal from a monitoring control unit (not shown).
- the output port of the optical switch 106 is connected to the redundant transponder 107.
- the optical coupler 102, the transponder 103, the optical switch 106, the optical switch 208, the redundant transponder 107, the supervisory controller, the transponder 204 and the optical coupler 205, which are not described, are provided on the first land section side of the submarine section. Provided at the terminal station.
- the client signal transmitted from the customer transmission device 101 is input to the transponder 103 via the optical coupler 102. Then, the output light from the transponder 103 is input to the opposing transponder 104 via the optical submarine cable. Thereafter, the output light from the transponder 104 passes through the optical coupler 105 and is input to the customer transmission device 201 installed in the second land section.
- the transponder 104, the optical coupler 105, the redundant transponder 207, the optical switch 206, which will be described later, the optical coupler 202 not described, and the monitoring control unit (not shown) are connected to the land end on the second land section side in the seabed section. Provided in the station.
- the optical switch 106 selects the optical switch 208 as an input source, and the optical switch 208 selects the optical switch 106 as an output destination.
- the optical switch 206 selects the optical switch 108 as an input source, and the optical switch 108 selects the optical switch 206 as an output destination.
- the signal (OTU frame) loops through the four optical switches 106, 108, 206, 208 and the two redundant transponders 107, 207.
- the monitoring control unit detects this, and controls the optical switch 106 to select the optical coupler 102 as an input source.
- the output destination of the optical switch 108 is changed to the optical coupler 105.
- the output light (client signal) from the optical coupler 102 is output to the redundant transponder 107 via the optical switch 106.
- the output light from the redundancy transponder 107 is input to the redundant redundancy transponder 207 via the optical submarine cable.
- the output light from the redundancy transponder 207 is input to the customer transmission apparatus 201 via the optical switch 108 and the optical coupler 105.
- ITU-T recommendation G is a maintenance switching protocol related to optical switch switching control when a failure occurs.
- the 709 standard “Interfaces for the Optical Transport Network (OTN)” has been standardized and used in optical transmission systems (for example, see Non-Patent Document 1).
- the OPUk payload is a place where transmission information is stored, and the overhead is a place where transmission information and a transmission path alarm are stored at the head of the payload.
- ITU-T Recommendation G In the 709 standard, an APS / PCC (Automatic Protection Switching Coordination channel / Protection Communication Control channel) byte, which is a switching overhead area, is used for monitoring control.
- APS / PCC Automatic Protection Switching Coordination channel / Protection Communication Control channel
- ITU-T Recommendation G. 709 “Interfaces for the Optical Transport Network (OTN)”
- the maintenance switching (switching of optical switches) using the conventional APS / PCC byte is performed by a plurality of maintenance devices on the transmission path connected in series, that is, the maintenance device in the land section and the maintenance device in the submarine section.
- each device must be able to use the overhead area individually according to the maintenance switching contents of each section.
- the APS / PCC byte is mapped to an ODU (Optical channel data unit) area (ODU overhead) used in the land section. Therefore, if the APS / PCC byte is used in the submarine section, maintenance switching using the APS / PCC byte cannot be performed via the submarine section in the land section, and maintenance is performed in the land optical transmission system and the submarine optical transmission system. There is a problem that the devices cannot coexist.
- the ODU frame of the OTU frame generated and terminated at the end-to-end of the line is transparent communication for the customer transmission device (communication that does not change the contents of the ODU region).
- the APS / PCC byte cannot be changed in the submarine section. Therefore, when the OTU interface is used, there is a problem that the maintenance switching method using the conventional APS / PCC byte cannot be applied to the maintenance switching in the seabed section.
- the present invention has been made to solve the above-described problems, and an object thereof is to provide an optical transmission system capable of coexisting a maintenance switching function for a land section and a maintenance switching function for a submarine section.
- An optical transmission system is an optical transmission system that is connected to a customer transmission apparatus that transmits a client signal, accommodates the client signal in an OTU frame, and transmits the client signal.
- An upstream transponder that transmits an OTU frame oppositely, and a redundant upstream transponder that transmits an OTU frame oppositely, and a downstream transmission path oppositely configured and an OTU frame when a failure occurs in the upstream transmission path
- Downlink transponders that store and transmit maintenance information in the OTU overhead, customer transmission devices and upstream transmission paths and redundant upstream transmission paths are switchably connected, and based on the maintenance information, the upstream transmission path is switched to the redundant upstream transmission path
- An optical switch is provided.
- the maintenance information is stored in the OTU overhead that is not used for storing the maintenance information of the customer transmission device (land section). Maintenance switching function and submarine section maintenance switching function can coexist.
- mapping figure which shows another example of the GCC0 area
- group optical transmission system. ITU-T Recommendation G. 709 is a schematic diagram of 709 standard OTU overhead mapping.
- FIG. 1 is a schematic diagram showing a configuration of an optical transmission system according to Embodiment 1 of the present invention.
- a customer transmission device 11 and a customer transmission device 21 which are network protection devices (NPE) are installed in a first land section and a second land section, respectively, Optical transmission communication is performed via the land terminal station installed in
- the land terminal station on the first land section side includes an optical coupler 12, an upstream transponder 13, an optical switch 16, a redundant transponder 17, a downstream transponder 24, an optical coupler 25, an optical switch 28, and a supervisory control unit (not shown). Is provided.
- the land terminal station on the second land section side includes an upstream transponder 14, an optical coupler 15, an optical switch 18, an optical coupler 22, a downstream transponder 23, an optical switch 26, a redundant transponder 27, and a supervisory control unit (not shown). Is provided.
- the upstream transponder 13 and the upstream transponder 14 constitute an upstream transmission path, and the downstream transponder 23 and the downstream transponder 24 configure a downstream transmission path.
- the redundancy transponder 17 and the redundancy transponder 27 face each other to form a redundant upstream transmission path and a redundant downstream transmission path.
- the output port of the customer transmission device 11 is connected to the optical coupler 12.
- One of the output ports of the optical coupler 12 is connected to the upstream transponder 13 and the other is connected to the optical switch 16.
- the optical switch 16 has an input port connected to the optical coupler 12 and the optical switch 28, and selects one as an input source in accordance with a control signal from the monitoring controller.
- the output port of the optical switch 16 is connected to the redundant transponder 17.
- the output port of the upstream transponder 13 is connected to the upstream upstream transponder 14 via the optical submarine cable, and the output port of the upstream transponder 14 is connected to the optical coupler 15.
- the optical coupler 15 has an input port connected to the upstream transponder 14 and the optical switch 18, and an output port connected to the customer transmission device 21.
- the output port of the customer transmission device 21 is connected to the optical coupler 22.
- One of the output ports of the optical coupler 22 is connected to the down transponder 23 and the other is connected to the optical switch 26.
- the optical switch 26 has an input port connected to the optical coupler 22 and the optical switch 18, and selects one as an input source in accordance with a control signal from the monitoring control unit.
- the output port of the optical switch 26 is connected to the redundant transponder 27.
- the output port of the down transponder 23 is connected to the opposing down transponder 24 via the optical submarine cable, and the output port of the down transponder 24 is connected to the optical coupler 25.
- the optical coupler 25 has an input port connected to the down transponder 24 and the optical switch 28, and an output port connected to the customer transmission device 11.
- the transponder 19 and the transponder 29 are connected to the customer transmission device 11 and the customer transmission device 21, respectively, and between the customer transmission device 11 and the customer transmission device 21.
- Other transmission paths in the submarine section are possible.
- the redundant transponders 17 and 27 and the transponders 19 and 29 forming other transmission paths both correspond to the up / down corresponding to the up transponder 13 and the down transponder 24 or the up transponder 14 and the down transponder 23.
- a transponder is included, the illustration is omitted.
- the customer transmission device 11 outputs a client signal to the optical coupler 12 and inputs output light (client signal) from the optical coupler 25. Further, the customer transmission device 11 is compliant with ITU-T Recommendation G.3 when a failure (line failure) occurs between the land section, for example, the optical coupler 25 and the customer transmission device 11.
- the client signal in which the APS / PCC byte of the ODU area in accordance with 709 is changed is transmitted through the transmission path via the upstream transponders 13 and 14 (or the transponders 19 and 29), and the output switching control (maintenance switching) of the customer transmission device 21 is performed. Do. As a result, the transmission path of the client signal from the customer transmission apparatus 21 is switched from the downstream transponders 23 and 24 to another transmission path by the transponders 29 and 19.
- the customer transmission device 21 outputs a client signal to the optical coupler 22 and inputs output light from the optical coupler 15. Further, the customer transmission device 21 is compliant with ITU-T Recommendation G.3 when a failure (line failure) occurs between land sections, for example, between the optical coupler 15 and the customer transmission device 21.
- the client signal in which the APS / PCC byte of the ODU area conforming to 709 is changed is transmitted through the transmission path via the downstream transponders 23 and 24 (or the transponders 29 and 19), and the output switching control (maintenance switching) of the customer transmission apparatus 11 is performed. Do. As a result, the transmission path of the client signal from the customer transmission apparatus 11 is switched from the upstream transponders 13 and 14 to another transmission path by the transponders 19 and 29.
- the optical coupler 12 divides the output light, which is a client signal from the customer transmission device 11, into two branches and outputs them to the upstream transponder 13 and the optical switch 16.
- the optical coupler 22 divides the output light, which is a client signal from the customer transmission device 21, into two branches and outputs them to the downstream transponder 23 and the optical switch 26.
- the upstream transponder 13 generates an OTU frame containing the client signal from the optical coupler 12 and transmits it to the upstream transponder 14 via the optical submarine cable. At this time, maintenance information is stored in the OTU overhead of the generated OTU frame based on the control signal from the monitoring control unit. Further, when a failure occurs in the seabed section, the upstream transponder 13 notifies the monitoring control unit of a failure notification alarm indicating that. Similarly, the down transponder 23 generates an OTU frame containing the client signal from the optical coupler 22 and transmits it to the down transponder 24 via the optical submarine cable. At this time, maintenance information is stored in the OTU overhead of the generated OTU frame based on the control signal from the monitoring control unit. Further, when a failure occurs in the seabed section, the down transponder 23 notifies the monitoring control unit of a failure notification alarm indicating that.
- the upstream transponder 14 terminates the OTU frame received from the upstream transponder 13 and outputs a client signal to the optical coupler 15. At this time, the contents of the OTU overhead are notified to the monitoring control unit. Further, when a failure occurs in the seabed section, the upstream transponder 14 notifies the monitoring control unit of a failure notification alarm indicating that.
- the down transponder 24 terminates the OTU frame received from the down transponder 23 and outputs a client signal to the optical coupler 25. At this time, the contents of the OTU overhead are notified to the monitoring control unit. Further, when a failure occurs in the seabed section, the down transponder 24 notifies the monitoring control unit of a failure notification alarm indicating that.
- the optical coupler 15 outputs the output light (client signal) from the upstream transponder 14 or the optical switch 18 to the customer transmission device 21.
- the optical coupler 25 outputs the output light (client signal) from the downstream transponder 24 or the optical switch 28 to the customer transmission device 11.
- the optical switch 16 outputs the output light from the optical coupler 12 or the optical switch 28 to the redundant transponder 17.
- the optical coupler 12 or the optical switch 28 is selected as an input source in accordance with a control signal from the monitoring control unit.
- the optical switch 26 outputs the output light from the optical coupler 22 or the optical switch 18 to the redundant transponder 27.
- the optical coupler 22 or the optical switch 18 is selected as an input source in accordance with a control signal from the monitoring control unit.
- the redundancy transponder 17 generates an OTU frame that accommodates the client signal from the optical switch 16 or an OTU frame that does not accommodate the client signal, and transmits it to the redundancy transponder 27 via the optical submarine cable. At this time, maintenance information is stored in the OTU overhead of the generated OTU frame based on the control signal from the monitoring control unit. Also, the OTU frame received from the redundancy transponder 27 is terminated and a client signal is output to the optical switch 28. At this time, the contents of the OTU overhead are notified to the monitoring control unit.
- the redundancy transponder 27 generates an OTU frame that accommodates the client signal from the optical switch 26 or an OTU frame that does not accommodate the client signal, and transmits it to the redundancy transponder 17 via the optical submarine cable.
- maintenance information is stored in the OTU overhead of the generated OTU frame based on the control signal from the monitoring control unit.
- the OTU frame received from the redundancy transponder 17 is terminated and a client signal is output to the optical switch 18. At this time, the contents of the OTU overhead are notified to the monitoring control unit.
- the optical switch 18 outputs the output light from the redundant transponder 27 to the optical coupler 15 or the optical switch 26.
- the optical coupler 15 or the optical switch 26 is selected as an output destination according to a control signal from the monitoring control unit.
- the optical switch 28 outputs the output light from the redundant transponder 17 to the optical coupler 25 or the optical switch 16. According to the control signal from the monitoring control unit, the optical coupler 25 or the optical switch 16 is selected as the output destination.
- the transponder 19 has the same functions as the upstream transponder 14 and the downstream transponder 23, and the upstream transponder 13 and the downstream transponder 24 and the transponder 29 have the same functions.
- the maintenance information (switching information) of the seabed section is mapped to Row # 1, Column # 11, and 12 of OTU overhead (OTU area) 50.
- the maintenance information (switching information) for the land section is stored in APS / PCC bytes mapped to Row # 4 and Column # 5 to 8 of ODU overhead (ODU area) 40 as before.
- the GCC0 area is used as a band for arbitrary data communication. Since this GCC0 area is an OTU area that is generated and terminated between adjacent optical transmission devices (transponders), it is closed and used within the seabed section. When transmitting from the seabed section to the land section, the OTU area is replaced again. Do. Therefore, even if maintenance information is stored in the GCC0 area, the customer transmission device in the land section is not affected.
- the maintenance information of the submarine section includes the multiframe identifier 51 for identifying a plurality of frames and the APS / PCC for storing 4 bytes of the APS / PCC value corresponding to the multiframe identifier 51. It consists of a data area 52.
- the ADU / PCC byte is defined as 4 bytes (Row # 4, Column # 5 to 8) in the ODU area, but the GCC0 area is 2 bytes in total (Row # 1, Crown # 11, 12).
- the maintenance information for 4 bytes cannot be stored as it is. Therefore, storage and communication of all the maintenance information are realized by making the GCC0 area into multi-frames and transmitting maintenance information of 4 bytes in three consecutive OTU frames.
- FIG. 3 shows overhead mapping in which the multi-frame identifier 51 is inserted into the Column # 11 in Embodiment 1 and the GCC0 area is converted into multi-frames.
- a 2-bit multi-frame identifier 51 area is secured at the beginning of the bit string of Column # 11, and “10”, “01”, and “00” are inserted in order into the three GCC0 areas that have been converted into multi-frames.
- the APS / PCC value (APS / PCC value) is stored in the APS / PCC data area 52 which is the lower 14 bits (the remaining 6 bits of Column # 11 and 8 bits of Column # 12) of each of the three GCC0 areas that have been multiframed.
- PCC bytes C5 [7: 0], C6 [7: 0], C7 [7: 0], 32 bits corresponding to C8 [7: 0]) are sequentially inserted.
- FIG. 3 is an example, and the value of the multiframe identifier 51 is arbitrary.
- the client signal output from the customer transmission device 11 is input to the optical coupler 12 in the submarine section.
- the output light (client signal) from the optical coupler 12 is input to the upstream transponder 13 and the optical switch 16.
- the upstream transponder 13 creates an OTU frame containing the client signal from the optical coupler 12 and transmits it to the upstream upstream transponder 14 via the optical submarine cable. Thereafter, the upstream transponder 14 terminates the OTU frame received from the upstream transponder 13 and inputs the client signal to the customer transmission device 21 via the optical coupler 15.
- the optical switch 16 selects the optical switch 28 as an input source according to the control signal from the supervisory controller,
- the switch 28 selects the optical switch 16 as an output destination.
- the optical switch 26 selects the optical switch 18 as an input source, and the optical switch 18 selects the optical switch 26 as an output destination.
- the optical signal loops through the four optical switches 16, 18, 26 and 28 and the two redundant transponders 17 and 27 constituting the redundant system in the seabed section.
- the client signal from the optical coupler 12 is not input to the redundancy transponder 17.
- the redundancy transponder 17 creates an OTU frame that does not accommodate a client signal, and transmits it to the opposing redundancy transponder 27 via the optical submarine cable.
- the redundancy transponder 27 terminates the OTU frame received from the redundancy transponder 17 and inputs the output light (not including the client signal) to the optical switch 18.
- the optical switch 18 selects the optical switch 26 as an output destination, the output light from the optical switch 18 is not input to the optical coupler 15.
- the output light of the optical switch 18 is input to the redundancy transponder 27 via the optical switch 26.
- the redundancy transponder 27 creates an OTU frame that does not accommodate the client signal, and transmits it to the opposing redundancy transponder 17 via the optical submarine cable.
- the redundancy transponder 17 terminates the OTU frame received from the redundancy transponder 27 and inputs the output light to the optical switch 28.
- the optical switch 28 selects the optical switch 16 as the output destination, the output light from the optical switch 28 is not input to the optical coupler 25.
- the output light of the optical switch 28 is input to the redundancy transponder 17 via the optical switch 16.
- the optical signal loops through the redundant system.
- the upstream transponder 14 When a line fault 61 occurs in the submarine section, the upstream transponder 14 first notifies the monitoring control unit of a fault notification alarm indicating that fact.
- the monitoring control unit detects the line failure 61 by this notification, and notifies the redundancy transponder 27 of an instruction to store maintenance information in the OTU frame (transmits a control signal).
- the redundancy transponder 27 receives the control signal from the monitoring control unit, generates the OTU frame storing the maintenance information by converting the GCC0 area into a multiframe as described above, and transmits it to the redundancy transponder 17.
- an OTU frame that does not include a client signal being loop-transmitted in a redundant system can be used as an OTU frame to be transmitted.
- the optical switches 18 and 26 select the optical coupler 15 as an output destination of the optical switch 18 and select the optical coupler 22 as an input source of the optical switch 26 under the control of the monitoring control unit.
- the redundancy transponder 17 terminates the OTU frame received from the redundancy transponder 27, and the maintenance information stored in the OTU overhead is notified to the monitoring control unit.
- the optical switches 16 and 28 select the optical coupler 12 as the input source of the optical switch 16 and select the optical coupler 25 as the output destination of the optical switch 28 under the control of the monitoring control unit based on the maintenance information.
- the transmission path of the main signal (including the client signal) between the customer transmission device 11 and the customer transmission device 21 is switched to the redundant system. That is, maintenance switching in the optical transmission system is completed.
- the upstream transponders 13 and 14 and the redundant transponders 17 and 27 in the submarine section send maintenance information to the OTU. Since the overhead is used for notification and the ODU overhead is not terminated, the APS / PCC byte in the ODU area is not rewritten, and transparent communication in the ODU area can be performed even if a fault occurs in the submarine section. It becomes.
- the customer transmission device 21 When the line failure 62 occurs in the land section, the customer transmission device 21 that has detected the failure switches the output destination of the client signal of the own device from the optical coupler 22 to the transponder 29 that constitutes another transmission path, and ITU -T Recommendation G.
- a client signal in which the maintenance information of the land section is stored in the APS / PCC byte of the ODU area is transmitted to the customer transmission apparatus 11.
- the customer transmission device 11 that has received the client signal storing the maintenance information of the land section switches the output destination of the client signal of the own device from the optical coupler 12 to the transponder 19 that constitutes another transmission path.
- the transmission path of the client signal from the customer transmission apparatus 11 to the customer transmission apparatus 21 is switched from the upstream transponders 13 and 14 to another transmission path by the transponders 19 and 29.
- the transponder in the submarine section performs transparent communication in the ODU area, so that it does not hinder communication of maintenance information in the land section.
- the maintenance information is stored in the GCC0 area of the OTU overhead.
- the maintenance switching function for the land section and the maintenance switching function for the submarine section can coexist.
- Embodiment 2 shows a case where information (head flag bit 53) indicating the head of a multiframe is stored in the head bit area for one bit of the GCC0 area. That is, in the optical transmission system according to the second embodiment, the maintenance information of the submarine section is obtained from the head flag bit 53 indicating the head of the multiframe and the APS / PCC data area 52 storing 4 bytes of the APS / PCC value. Constitute.
- FIG. 6 shows overhead mapping in which the head flag 53 is inserted into the Column # 11 in the second embodiment and the GCC0 area is multiframed.
- the area of the 1-bit head flag 53 is secured at the head of the bit string of the Column # 11, and “1”, “0”, and “0” are inserted in order into the three GCC0 areas that have been converted into multiframes.
- an APS / PCC value (APS / PCC value) is added to the APS / PCC data area 52, which is the lower 15 bits of each of the three GCC0 areas that have been converted into multi-frames (the remaining 7 bits of Column # 11 and 8 bits of Column # 12).
- PCC bytes C5 [7: 0], C6 [7: 0], C7 [7: 0], 32 bits corresponding to C8 [7: 0]) are sequentially inserted.
- 4 bytes of the APS / PCC value can be stored in the GCC0 area converted into a multiframe.
- the transponder that receives and terminates the OTU frame includes a counter for recognizing how many frames the read frame is from the top of the multiframe.
- the transponder resets the counter upon reception of the frame whose head flag 53 is “1”, thereby accurately recognizing the multiframe and reading the maintenance information stored in the GCC0 area.
- the read maintenance information is notified to the monitoring control unit, and maintenance switching in the optical transmission system is performed as in the first embodiment.
- the head flag bit 53 is stored in the GCC0 area to be multi-framed and the maintenance information is stored, optical transmission is performed as in the first embodiment.
- the system it is possible to obtain the effect that the maintenance switching function for the land section and the maintenance switching function for the seabed section can coexist.
- the first 1 bit of each frame can be used as a data area, a lot of data can be inserted, such as inserting other information such as data other than the APS / PPC value into the GCC0 area at the same time. .
- a head flag bit 53 and a multi-frame identifier 51 can be used in combination as shown in FIGS.
- the head bit flag 53 and the multi-frame identifier 51 for identifying a plurality of frames are defined not only in the Column # 11 but also in the Column # 12.
- the head flag bit 53 is 1 bit
- the multiframe identifier 51 is 3 bits
- 4 OTU frames are used to send 4 bytes of the APS / PCC value.
- Embodiment 3 In the first and second embodiments, the case where the maintenance information is stored in the GCC0 area of the OTU overhead when a line failure occurs in the submarine section of the optical transmission system has been described.
- the maintenance information (switching information) of the seabed section is reserved for future international standardization (RES) mapped to Row # 1, Column # 13, and 14 of the OTU overhead (OTU area). The case of storing in the area will be described.
- RES international standardization
- FIG. 9 shows overhead mapping in which the head flag 53 and the multi-frame identifier 51 are inserted into the Column # 13 in the third embodiment, and the RES area is converted into multi-frames.
- a 1-bit head flag 53 area and a 2-bit multi-frame identifier 51 area are secured at the head of the bit string of Column # 13, and the head flag “1” and the multi-frame identifier are assigned to three multi-frame RES areas. “10”, a head flag “0”, a multiframe identifier “01”, a head flag “0”, and a multiframe identifier “00” are inserted in order.
- the APS / PCC data area (APS / PCC value) is stored in the APS / PCC data area 52, which is the lower 13 bits (the remaining 5 bits of Column # 13 and 8 bits of Column # 14) of each of the three GCC0 areas converted into multiframes.
- PCC bytes C5 [7: 0], C6 [7: 0], C7 [7: 0], 32 bits corresponding to C8 [7: 0]) are sequentially inserted.
- 4 bytes of the APS / PCC value can be stored in the multi-frame RES area.
- the RES area is 2 bytes as in the GCC0 area
- multiframe and data insertion when storing maintenance information in the OTU frame are the same as those shown in the first and second embodiments, that is, The method of inserting only the multi-frame identifier or only the head flag can be similarly used.
- the GCC0 area may be used for other purposes other than optical transmission in an optical transmission device in the submarine section, but the RES area is not defined in the ITU-T recommendation and can be used as it is. .
- the maintenance switching of the land section is performed as in the first embodiment.
- the function and the maintenance switching function of the submarine section can be made to coexist.
- the optical transmission system stores the maintenance information in the OTU overhead that is not used for storing the maintenance information of the customer transmission device (the land section), thereby coexisting the maintenance switching function for the land section and the maintenance switching function for the submarine section. It is suitable for use in an optical transmission system or the like in which maintenance devices that use two types of maintenance switching protocols coexist.
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Abstract
Description
実施の形態1.
図1はこの発明の実施の形態1に係る光伝送システムの構成を示す概要図である。
まず、通常運用状態の場合での動作について、図1を参照しながら説明する。なお以下では、顧客伝送装置11から顧客伝送装置21にクライアント信号を伝送する場合について示す。
実施の形態1では、光伝送システムの海底区間において回線障害が発生して、OTUオーバーヘッドに保守情報を格納する際に、GCC0領域のマルチフレーム化の方法として、先頭の2ビットにマルチフレーム識別子51を格納した場合について示した。これに対して、実施の形態2では、GCC0領域の1ビット分の先頭ビット領域にマルチフレームの先頭を示す情報(先頭フラグビット53)を格納する場合について示す。すなわち、実施の形態2に係る光伝送システムでは、海底区間の保守情報を、マルチフレームの先頭を示す先頭フラグビット53と、APS/PCC値の4バイトを格納するAPS/PCCデータ領域52とから構成する。
実施の形態1,2では、光伝送システムの海底区間において回線障害が発生した場合に、保守情報をOTUオーバーヘッドのGCC0領域に格納する場合について示した。これに対して、実施の形態3では、海底区間の保守情報(切り替え情報)を、OTUオーバーヘッド(OTU領域)のRow#1,Cloumn#13,14にマッピングされるReserved for future international standardization(RES)領域に格納する場合について示す。
Claims (12)
- クライアント信号を送信する顧客伝送装置と接続され、前記クライアント信号をOTUフレームに収容して伝送する光伝送システムにおいて、
対向して上り伝送経路を構成し前記OTUフレームを伝送する上りトランスポンダ、
対向して冗長系上り伝送経路を構成し前記OTUフレームを伝送する冗長用上りトランスポンダ、
対向して下り伝送経路を構成し、前記上り伝送経路に障害が発生した際に、前記OTUフレームのOTUオーバーヘッドに保守情報を格納し伝送する下りトランスポンダ、
前記顧客伝送装置と前記上り伝送経路および前記冗長系上り伝送経路を切り替え可能に接続し、前記保守情報に基づき、前記上り伝送経路から前記冗長系上り伝送経路へ切り替える光スイッチ
を備えることを特徴とする光伝送システム。 - 前記下りトランスポンダは、前記保守情報を前記OTUオーバーヘッドのGCC0領域に格納する
ことを特徴とする請求項1記載の光伝送システム。 - 前記下りトランスポンダは、前記保守情報を前記OTUオーバーヘッドのRES領域に格納する
ことを特徴とする請求項1記載の光伝送システム。 - 前記下りトランスポンダは、前記保守情報をマルチフレーム化した複数の前記GCC0領域に分割して格納する
ことを特徴とする請求項2記載の光伝送システム。 - 前記下りトランスポンダは、前記分割した保守情報をマルチフレーム識別子と合わせて、前記複数のGCC0領域に格納することによりマルチフレーム化する
ことを特徴とする請求項4記載の光伝送システム。 - 前記下りトランスポンダは、前記分割した保守情報を、マルチフレームの先頭を示す先頭フラグと合わせて、前記複数のGCC0領域に格納することによりマルチフレーム化する
ことを特徴とする請求項4記載の光伝送システム。 - 前記下りトランスポンダは、前記分割した保守情報を、マルチフレームの先頭を示す先頭フラグ及びマルチフレーム識別子と合わせて、前記複数のGCC0領域に格納することによりマルチフレーム化する
ことを特徴とする請求項4記載の光伝送システム。 - 前記下りトランスポンダは、前記保守情報をマルチフレーム化した複数の前記RES領域に分割して格納する
ことを特徴とする請求項3記載の光伝送システム。 - 前記下りトランスポンダは、前記分割した保守情報をマルチフレーム識別子と合わせて、前記複数のRES領域に格納することによりマルチフレーム化する
ことを特徴とする請求項8記載の光伝送システム。 - 前記下りトランスポンダは、前記分割した保守情報を、マルチフレームの先頭を示す先頭フラグと合わせて、前記複数のRES領域に格納することによりマルチフレーム化する
ことを特徴とする請求項8記載の光伝送システム。 - 前記下りトランスポンダは、前記分割した保守情報を、マルチフレームの先頭を示す先頭フラグ及びマルチフレーム識別子と合わせて、前記複数のRES領域に格納することによりマルチフレーム化する
ことを特徴とする請求項8記載の光伝送システム。 - 前記下りトランスポンダは、対向して冗長系下り伝送経路を構成する冗長用下りトランスポンダを含み、
前記顧客伝送装置と前記上り伝送経路が接続されている場合に、前記冗長系上り伝送経路と前記冗長系下り伝送経路はループを形成し、
前記冗長用下りトランスポンダが、前記保守情報を前記ループ上を伝送されるOTUフレームのOTUオーバーヘッドに格納して伝送する
ことを特徴とする請求項1から請求項3のうちのいずれか1項記載の光伝送システム。
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US14/780,855 US9692504B2 (en) | 2013-05-17 | 2013-05-17 | Optical transport system |
JP2015516862A JP6120957B2 (ja) | 2013-05-17 | 2013-05-17 | 光伝送システム |
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CN109075857A (zh) * | 2016-03-30 | 2018-12-21 | 日本电气株式会社 | 信号回送回路和信号回送方法 |
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JP6493534B2 (ja) * | 2015-08-03 | 2019-04-03 | 日本電気株式会社 | 光分岐挿入装置及び光分岐挿入方法 |
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CN105229948B (zh) | 2018-02-27 |
US20160056887A1 (en) | 2016-02-25 |
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CN105229948A (zh) | 2016-01-06 |
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