JP2018019224A - Transmission apparatus and transmission method - Google Patents

Abstract

An object of the present invention is to improve reliability by parity transmission when transmitting a client signal in an OTUCn frame format. Kind Code: A1 An optical transmission apparatus for multicarrier transmission using OTUCn (Optical Channel Transport Unit Cn), comprising a frame multiplexing unit that accommodates a client signal in a TS (Tributary Slot/Time Slot) and forms a frame; and an encoding unit that encodes a payload area between lanes using the TS as an encoding unit. [Selection drawing] Fig. 1

Description

  The present invention relates to an optical transmission technique.

  An OTN (Optical Transport Network) which is a large-capacity wide-area optical transport network accommodates and transfers various client signals such as SDH (Synchronous Digital Hierarchy) and Ethernet (registered trademark). In recent years, the increase in traffic of client signals has been remarkable, and along with this, standardization of OTUk (k = 1, 2, 3, 4) (Optical Channel Transport Unit k) has been advanced so that OTN can cope with higher speed. (For example, refer nonpatent literature 1). Currently, OTUCn (Cn represents 100G × n), which is an OTN technology exceeding 100G (B100G, G is gigabit per second), has been studied (for example, see Non-Patent Document 2). In OTUCn, the transmission capacity of one optical channel is wider than that of a conventional OTU.

  However, due to the relationship between the operating speeds of electronic circuits used in optical signal transceivers, it is difficult to increase the capacity by expanding single carrier transmission in the band of one optical channel as in the past. Therefore, in OTUCn, it has been studied to realize a large capacity by multicarrier transmission using a plurality of optical subcarriers in a band of one optical channel.

  In multicarrier transmission, when a plurality of optical subcarriers (physical links) are bundled to form one large logical channel (logical link), the reliability of the logical channel decreases as the number of bundled optical subcarriers increases. For example, the operation rate of a logical channel in which five optical subcarriers having an operation rate of 0.9 is bundled is 0.9 to the fifth power (about 0.59). Therefore, in order to stably operate broadband transmission, it is necessary to improve the operating rate by applying various high reliability methods to the channel.

  In order to increase the reliability of multicarrier transmission, (1 + 1) redundancy system (Patent Document 1), M / N redundancy system (Non-Patent Document 3), which is a system applying (M / N) redundancy, The operating rate is improved by applying a method for transmitting the parity calculated from the transmitted data through a backup transmission line (hereinafter referred to as “parity transmission method”) (Patent Document 2). .

  In the (1 + 1) redundancy method, two signals to be transmitted at the transmitting end are copied, one signal is transmitted through the working transmission line, and the other signal is transmitted through the standby transmission line for communication. If a failure occurs in the active transmission line, communication is continued by detecting a signal loss at the receiving end and switching the transmission line used for communication from the active transmission line to the standby transmission line. Done. Normally, after a transmission line used for communication is switched to a standby transmission line after a failure occurs, the transmission line is used for communication even if the failure in the working transmission line is recovered by repair or replacement of equipment. In general, “switch back” is not performed to return the current transmission line to the active transmission line, and after the restoration, the operation is continued using the active transmission line as the standby transmission line.

  In the (M / N) redundancy system, R (R = N−M) standby transmission lines are provided in advance for M active transmission lines. The (M / N) redundancy scheme is a scheme that allows communication to continue as long as M transmission paths out of N transmission paths are operating normally. Usually, R spare transmission lines are provided which are fewer than M active transmission lines, so that it is possible to achieve more economical than the (1 + 1) redundancy system. The (M / N) information method is different from the (1 + 1) redundancy method, and when the working transmission line is normal, copying the data of the working transmission line to the R spare transmission lines is not possible. When a failure occurs in the active transmission line, communication is restored by selecting one of the R standby transmission lines and switching the transmission line between the transmission end and the reception end. When the transmission path in which the failure has occurred is recovered from the failure, “switchback” for returning the communication path from the standby transmission path to the active transmission path is performed at both the transmission end and the reception end.

  In the parity transmission method, R backup transmission lines are provided for M active transmission lines. Unlike the (M / N) redundancy system, the parity transmission system transmits erasure correction codes (parity) calculated from data transmitted in M working transmission lines through R standby transmission lines. When a failure occurs, recovery is performed by generating data on the active transmission line in which the failure has occurred from the data of the active transmission line and the standby transmission line in which no failure has occurred at the receiving end. . Unlike the (M / N) redundancy method, in the parity transmission method, switching and switching back are performed only at the receiving end both when a failure occurs and when a failure channel is restored.

  In the invention of Patent Document 2, a parity transmission method is described in packet transmission such as Ethernet (registered trademark) and frame transmission such as OTN. When focusing on the implementation method in packet transmission, the transmission end filters the packet to be encoded at the packet input unit upstream of the encoding circuit, and then the UDP / IP ( Pack User Datagram Protocol / Internet Protocol) packets. At this time, the buffer corresponding to lane # 0 is inserted in order, and the remaining area is padded with “0”.

  In addition, a parity-dedicated lane can be set for each lane, and a UDP / IP packet is not inserted into the set lane so that the minimum number of parity lanes can be guaranteed. In order to assume that the UDP / IP packet input to the encoding circuit at the transmission end arrives at random, a timeout is set, and encoding is started after a lapse of a certain time from the arrival of the head packet. Each time slot has the same sequence number, and when the timeout or buffer becomes full, the sequence number is incremented by “1”.

  In IP transmission, there is a possibility that the arrival order may be switched when passing through a router or a switch. Therefore, information indicating whether the encapsulated data is a client packet or a parity (pause lane notification) is overhead as information relating to encapsulation. It was decided to add it to the area.

JP-A-9-36826 International Publication No. 2014/045906

"Interfaces for the optical transport network", ITU-T G.709 / Y.1331, February 2012 Takuya Ohara, “OTN Interface Technology and Standardization Trends”, 2014 IEICE General Conference, Proceedings of Communication Lecture 2, BI-5-1, SS-47-SS-48, March 2014 JISZ8115 dependability (reliability) terminology, p. 28

  In Patent Document 2, in addition to the above-described packet transmission method, a frame transmission method based on OTN is described. On the other hand, when the frame transmission method by OTN is used, the unit of encoding is for each lane, and the redundancy cannot be set for each client signal. In addition, the information described in Patent Document 2 requires information on the packet length used for multiplexing / separating packets to be encapsulated and information on sequence numbers used for deskew for each sequence. When considering application to the frame structure of OTUCn, there is a problem that the technique of Patent Document 2 cannot be applied as it is in coding of the overhead region.

  In view of the above circumstances, an object of the present invention is to provide a technique capable of realizing an improvement in reliability by parity transmission when a client signal is transmitted in an OTUCn frame format.

  One aspect of the present invention is an optical transmission apparatus in multicarrier transmission using OTUCn (Optical Channel Transport Unit Cn), in which client signals are accommodated in TS (Tributary Slot / Time Slot) and frame multiplexed. And an encoding unit that encodes a payload area between lanes using the TS as an encoding unit.

  One aspect of the present invention is the above-described transmission device, in which the encoding unit performs encoding with a redundancy set according to the client signal.

  One aspect of the present invention is the transmission apparatus described above, wherein the frame multiplexing unit stores the parity storage information obtained by the encoding in an overhead area.

  One aspect of the present invention is the above-described transmission device, wherein the frame multiplexing unit accommodates the parity accommodation information in a PSI (Payload Structure Identifier) area in an overhead area.

  One aspect of the present invention is the transmission apparatus described above, wherein the frame multiplexing unit stores the parity storage information in a RES (Reserved for future international standardization) area in an overhead area.

  One aspect of the present invention is the above-described transmission device, wherein the encoding unit encodes information of an area in the overhead area where a copy is not sent to each lane.

  One aspect of the present invention is the above-described transmission device, wherein the encoding unit generates and stores a copy of the same area of each lane for information related to alarm transfer in the overhead area.

  One aspect of the present invention is a transmission method in multi-carrier transmission using OTUCn (Optical Channel Transport Unit Cn), in which a client signal is accommodated in a TS (Tributary Slot / Time Slot) and framed. Is a transmission method for encoding the payload area between the lanes.

  According to the present invention, when a client signal is transmitted in the OTUCn frame format, it is possible to improve the reliability by parity transmission.

It is a figure which shows the frame format of OTUCn. It is a figure which shows the structure of an overhead area | region. It is a figure which shows GM used when accommodating a client signal in OTUCn. In the 1st Embodiment of this invention, it is a figure which shows the encoding system in the case of accommodating a client signal in a payload area | region. 1 is a block diagram showing a configuration of an optical transmission system 1 according to a first embodiment of the present invention. In the 2nd Embodiment of this invention, it is a figure which shows the encoding system in the case of accommodating a client signal in a payload area | region. It is a figure which shows the specific example of the storage area of parity accommodation information. It is a figure which shows the specific example of the storage area of parity accommodation information. It is a figure which shows the specific example of the storage area of parity accommodation information. It is the figure which put together the protection policy of each overhead area | region. It is a figure which shows an example of the accommodation position of the encoding information of the overhead area | region which concerns on the 3rd Embodiment of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
<First Embodiment>
In the optical transmission system according to the first embodiment of the present invention, a client signal is mainly transmitted to a TS (Tributary Slot / Time Slot) by GM (General Mapping Procedure) in the OTUCn frame format. First, the OTUCn frame format will be described.

  FIG. 1 shows a frame format of OTUCn. The basic structure of OTUCn is a structure in which n frames of OTUk (Optical channel Transport Unit-k) are parallelized. That is, one frame of OTUk has a fixed length of 4 rows × 3824 columns as shown in FIG. The first to sixteenth columns are used for management such as OAM (Operation, Administration, Maintenance) of an optical path as an overhead (OH) area. A FAS (Frame alignment Signal) area is provided at the head of the OH area. A payload area is provided in the 17th to 3824th columns following the OH area. N such OTUk frames are arranged in parallel to form an OTUCn frame.

  FIG. 2 shows the configuration of the overhead area. The overhead area has a frame size of 16 bytes × 4 rows in the 1st to 16th columns. The first row includes Frame Alignment OH in the first to seventh columns, SM (Section Monitor) in the eighth to tenth columns, GCC (General Communication Channel) 0 in the eleventh to twelfth columns, It consists of 13th column OSMC (ONT Synchronization Message Channel), 14th column RES (Reserved for future international standardization), 15th column JC (Justification Control Byte) 4 and 16th column JC1. Frame Alignment OH includes an FAS (Frame Alignment Signal) indicating the head of the frame and an MFAS (Multi-Frame Alignment Signal) indicating the sequence number of the frame.

  The second row is RES (Reserved for future international standardization) in the first column to the second column, PM and TCM (Path monitoring and Tandem Connection Monitoring) in the third column, EXP (Experimental) in the fourth column, 5th to 7th TCM6, 8th to 10th TCM5, 11th to 13th TCM4, 14th EXP, 15th JC5, 16th Of JC2.

  The third row includes TCM3 in the first to third columns, TCM2 in the fourth to sixth columns, TCM1 in the seventh to ninth columns, and PM (Path Monitoring in the tenth to twelfth columns). ), EXP in the 13th to 14th columns, JC6 in the 15th column, and JC3 in the 16th column.

  The fourth row includes GCC1 in the first to second columns, GCC2 in the third to fourth columns, APS / PCC (Autonomic Protection Switching / Protection Communication Channel) in the fifth to eighth columns, 9 It consists of the RES in the 14th column, the PSI (Payload structure Identifier) in the 15th column, and the OMFI (OPU Multi Frame Identifier) in the 16th column. PSI indicates payload configuration information. The OMFI indicates position information in the multiframe.

  FIG. 3 shows GM (General Mapping Procedure) used when accommodating a client signal in OTUCn. As shown in FIG. 3, in GMP, when a client signal or LO ODU (Lower Order Optical Channel Data Unit) signal is asynchronously accommodated in a HO ODU (Higher Order Optical Channel Data Unit), the payload area of the frame is converted into a TS (Tributary Slot). / Time Slot). Thereafter, the client signal or staff is accommodated in the TS while absorbing the frequency difference between the two signals. As a result, it is possible to accommodate a client signal of an arbitrary bit rate rather than prescribing the accommodation method for each of various client types, thereby ensuring the flexibility and future potential of OTN. In OTUCn, TS is divided so that the transfer capacity in one frame has a storage granularity of 5 Gbit / s, and OTUCn is composed of 20n TS.

  FIG. 4 shows an encoding method when the client signal is accommodated in the payload area in the first embodiment of the present invention. As shown in FIG. 4, in the present embodiment, encoding processing is performed between lanes using GMP TS as a unit of encoding, and a predetermined lane is set as a parity lane. That is, in this example, client signals or stuff TSs are accommodated in lanes # 1 to # 3 as a unit, and parity is obtained by encoding processing using TS as a unit of encoding between each lane # 1 to # 3. Parity is accommodated in lane # 4.

  As shown in FIG. 2, in the OTN, the OTU overhead area of each lane includes a Frame Alignment OH, and the Frame Alignment OH includes an MFAS. The value of this MFAS area is incremented by 1 every time one frame is transmitted. The receiving end adjusts the skew between lanes using the value of the MFUC area of OTUCn, and demaps the client signal by aligning the corresponding frame phase.

  Using this mechanism, encoding is performed on the payload area of a frame having the same MFAS value between lanes # 1 to # 3, and at the receiving end, the frames of lanes # 1 to # 3 after inter-lane deskewing are encoded. By performing the decryption process, sequence numbers can be synchronized between transmission and reception. For this reason, even when the encoding process is performed between the lanes, it is not necessary to newly provide a sequence number area or the like in the overhead area of the OTN.

  In addition, each client signal in the OTN is accommodated in an OTUCn TS having a semi-fixed band by the GMP shown in FIG. That is, the TS in which each client signal is accommodated is not changed except when an ODU (Optical Channel Data Unit) path is opened / deleted or when an intentional TS is replaced. For this reason, when encoding processing is performed between the lanes, it is not necessary to newly provide an area indicating the packet length in the overhead area of the OTN.

  In this embodiment, one lane is a parity lane. As a result, the service can be continued until one lane failure regardless of where the client signal is accommodated in the TS.

  FIG. 5 is a block diagram showing the configuration of the optical transmission system 1 according to the first embodiment of the present invention. In FIG. 5, the transmission apparatus 100 includes a frame multiplexing unit 101, an encoding unit 102, and a transmission unit 103.

  The frame multiplexing unit 101 accommodates the client signal in the TS and generates an OTUCn frame. As illustrated in FIG. 4, the encoding unit 102 performs encoding processing between lanes # 1 to # 3 using TS as an encoding unit, and arranges the parity in lane # 4. The transmission unit 103 transmits a multi-lane optical signal via the optical transmission path 105.

  The receiving apparatus 120 includes a receiving unit 121, a deframe unit 122, and a decoding unit 123. The receiving unit 121 receives a multi-lane optical signal via the optical transmission path 105. The deframe unit 122 extracts the client signal from the signal transmitted in the OTUCn frame. When a failure occurs in the signal of each lane, the decoding unit 123 performs a decoding process between the lanes using the parity transmitted in the parity lane.

  As described above, in the first embodiment of the present invention, when a client signal is accommodated in a TS and framed, the payload area is encoded between lanes using the TS as an encoding unit. Therefore, it is possible to improve reliability by parity transmission without providing a sequence number area and an area indicating the packet length in the overhead area of the OTN.

<Second Embodiment>
Next, a second embodiment of the present invention will be described. In the first embodiment described above, one lane is defined as a parity lane, and the redundancy is constant by encoding. That is, in the first embodiment, as shown in FIG. 4, encoding processing is performed between lanes # 1 to # 3 using TS as an encoding unit, and the parity is arranged in lane # 4. The redundancy is 1 and constant. On the other hand, in this embodiment, the redundancy of the encoding process is changed for each client signal.

  In other words, if the client signal is high speed, more powerful correction processing is required, so that the redundancy of the encoding processing needs to be increased. If the client signal is low speed, it is desirable to reduce the redundancy of the encoding process and increase the data transmission efficiency. Therefore, in this embodiment, the redundancy of the encoding process is changed according to the client signal.

  FIG. 6 shows an encoding method when a client signal is accommodated in a payload area in the second embodiment of the present invention. In this example, first, 100 Gbit / s client signals are accommodated in lanes # 1 and # 2, parity is accommodated in lanes # 3 and # 4, and the redundancy is “2”. As a result, it is possible to continue providing services up to two lane failures. Next, 50 Gbit / s client signals are accommodated in lanes # 1 and # 2, 25 Gbit / s client signals are accommodated in lane # 3, parity is accommodated in lane # 4, and the redundancy is “ 1 ". As a result, it is possible to continue providing services up to one lane failure. Next, 100 Gbit / s client signals are accommodated in lanes # 1 to # 4, and the encoding process is not performed. In this case, even if a failure occurs in any lane, the service is interrupted, but the redundancy is “0” and efficient data transfer is possible. As described above, in the second embodiment, the reliability of the service can be set for each client signal.

  In the second embodiment, since the redundancy is changed by the client signal, the number of lanes to be parity lanes and the lane number are changed. For this reason, it is necessary to notify parity accommodation information that is information indicating whether client signal data or parity is accommodated in the payload area of each lane between transmission and reception. As a notification method, it can be realized by providing a parity accommodation information notification area in the OTN overhead. However, since the client signal is semi-fixedly accommodated in the TS as described above, a network control network is provided for each transmission / reception end. It can also be realized by setting from (C-plane).

  As methods for notifying the parity accommodation information using the overhead of the OTN, three methods as shown in FIGS. 7 to 9 can be considered.

  FIG. 7 is a diagram illustrating a specific example of the storage area of the parity storage information. In FIG. 7, the MSI (Multiplex Structure Identifier) of the PSI area in the 15th column of the 4th row of the overhead area is used. The MSI is an area indicating which client signal is accommodated in the TS of each lane. When the Occupation bit of the MSI is “1”, it indicates that the corresponding TS contains a client signal. Using this fact, when the Occupation bit is “0”, it can be extended to indicate that parity is accommodated. In addition, a bit indicating parity / data distinction may be newly expanded.

  8 and 9 are diagrams illustrating specific examples of the storage area of the parity storage information. 8 and 9, the RES (Reserved for future international standardization) area in the 14th column of the first row of the overhead area is used. In FIG. 8, information indicating data or parity is added to the RES area for each lane. When the information of each lane is “0”, it indicates that the client signal is accommodated in the corresponding TS, and when “1”, the parity is accommodated in the corresponding TS. In FIG. 9, parity accommodation information is transmitted in multiframes synchronized with the RES area and the MFAS value. “0x00” indicates that the lane accommodates the client signal, and “0x01” indicates that the lane is a parity lane.

  8 and 9 cannot be applied to parity / data distinction for each TS, and thus can be applied to a method of performing encoding with a constant parity lane. For example, it is suitable for use in the first embodiment when indicating which lane is a parity lane. The method of FIG. 8 has an advantage that it does not take time to synchronize the parity accommodation information between transmission and reception, but the overhead area required increases as the number of lanes increases. In the methods shown in FIGS. 7 and 9, the necessary overhead area can be suppressed, but at least 256 frames (approximately 297 μsec) are required to synchronize the parity accommodation information between transmission and reception.

  The configuration of the optical transmission system according to the second embodiment of the present invention is basically the same as that of the optical transmission system according to the first embodiment shown in FIG. In the second embodiment, the frame multiplexing unit 101 accommodates a client signal in a TS and generates an OTUCn frame. Further, the frame multiplexing unit 101 accommodates the parity accommodation information in the PSI area or RES area in the overhead area. The encoding unit 102 sets redundancy according to the client signal, and performs encoding processing between lanes using TS as an encoding unit.

<Third Embodiment>
Next, a third embodiment of the present invention will be described. In the first and second embodiments described above, encoding of the payload area has been described. In the third embodiment, in addition to encoding the payload area, an OTN overhead area encoding system will be described. In the examination, each area of overhead was classified as follows.

(1) Area where no copy protection is required because a copy is sent to each lane (2) Area where no copy is sent to each lane

  The information of the overhead area of OTN is as shown in FIG. Among them, overhead areas classified as (1) include BEI / BIAE (Backward Error Indication / Backward Incoming Alignment Error) in the SM area (1st row, 8th column to 10th column), PM region (3 BEI of the 10th to 12th columns) is raised. In standardization, the value of lane # 1 is used as a representative, and the value of other lanes is transmitted as a copy. However, when a failure occurs in lane # 1, signals from other lanes are substituted. can do. Therefore, it is not necessary to protect these areas by encoding.

  On the other hand, in the area (2) where no copy is sent, it is necessary to consider protection by encoding. Here, the region (2) is further classified into three as follows.

(2-a) Area related to demapping of payload area (2-A) Area related to OAM (Operation, Administration, Maintenance) such as alarm (2-C) Area that can be freely implemented by equipment vendors

  First, the overhead area (2-a) will be considered. These include a JC1 to JC6 area and an PSI area for OPU (Optical Channel Payload Unit) overhead. These contain information (data / stuff) on mapping of client signals by GMP. An area with the same name is provided in the same area of each lane, but lanes # 2 to #n are not a copy of the information of lane # 1, but contain mapping information for each lane. Therefore, when a lane failure occurs and these pieces of information are lost, the original client signal cannot be restored from the payload area at the receiving end. Therefore, these areas must be protected by encoding.

  Next, consider the area (2-i). These include BDI (Backward Defect Indication) and STAT (Status) in the SM area and PM area. These can be protected by storing a copy of the information of lane # 1 in lanes # 2 to #n. On the other hand, the BIP-8 (Bit Interleaved Parity Level 8) area of the SM area and PM area accommodates BIP (Bit Interleaved Parity) calculated from the frame information of each lane, and this value is matched between the transmitting and receiving ends. To control the alarm. For this reason, since data corresponding to each lane is accommodated instead of a copy of the information of lane # 1, it is necessary to consider a protection method for the BIP-8 area.

  The last (2-c) area will be described. These areas include the GCC0 to GCC2 area, the RES area, and the EXP area of the OTU / ODU overhead area. A GCC (General Communication Channel) area provides a communication band of (n × 13.768) Mbit / s according to the number of lanes, and is an area that can be used for general purposes. Since the method of using the area can be freely determined by the equipment vendor implementation, the GCC area of the p parity lanes is used for protecting the area (2-i), and the remaining ((n−p) × 13. 768) The Mbit / s band can also be used for other general purpose applications. The RES (Reserved for future international standardization) area has no fixed use in the current recommendation, and is an area reserved for function expansion in the future recommendation. Therefore, these areas of each lane can be used for protecting the area classified as (2-a) and the BIP-8 area in (2-i).

  From the above discussion, FIG. 10 shows a summary of protection policies for each overhead area. In FIG. 10, white circles are areas that do not need to be protected by encoding because a copy is sent to each lane, and a cross mark accommodates a copy of the information of lane # 1 in lanes # 2 to #n. This is an area that can be protected. These do not need to be protected by encoding. The area that needs to be protected by encoding is overhead indicated by black triangles in the table, and there are 15 bytes in one frame. For the MSI and JC1 to JC6 in the OPU overhead area, since the client signal is not directly mapped to the parity lane, the parity generated from each area of the data lane can be accommodated in the same area of the parity lane. On the other hand, for BIP-8 in the SM, PM, and TCM1 to TCM6 areas, it is necessary to calculate and accommodate the BIP value from the data in the OPU overhead area and payload area of each lane regardless of the data / parity lane type. . For this reason, BIP-8 encoded information of 8 bytes is accommodated in the area (2-c) (star mark in the table).

  FIG. 11 is an example of a storage location of encoded information in the overhead area according to the third embodiment of the present invention. As the accommodation position of the encoded information in the overhead area, the RES area of the ODU overhead is preferentially used as the encoded information accommodation area. The MSI and JC1 to JC6 of the PSI area accommodate the parity generated from each area of the data lane in the same area of the parity lane. The value of the BIP-8 area in the data lane is encoded and stored in the corresponding position shown in FIG. 12 in the parity lane.

  The configuration of the optical transmission system according to the third embodiment of the present invention is basically the same as that of the optical transmission system according to the first embodiment shown in FIG. In the third embodiment, the frame multiplexing unit 101 accommodates a client signal in a TS and generates an OTUCn frame. Also, the frame multiplexing unit 101 uses the encoded information from each lane as the same area of the parity lane for information related to the mapping of the client signal of the OPU overhead among the areas in which no copy is sent to each lane. To house. Also, for the BIP in the SM area, PM area, and TCM area, the encoded information is accommodated in the RES area, GCC area, and EXP area of the parity lane. As for other overhead related to alarm transfer, etc., a copy of the same area is generated and accommodated in each lane. The encoding unit 102 sets redundancy according to the client signal, and performs encoding processing between lanes using TS as an encoding unit. Also, the encoding unit 102 encodes an overhead area for the area that needs to be encoded in FIG.

A program for realizing all or part of the functions of the optical transmission system 1 is recorded on a computer-readable recording medium, and the program recorded on the recording medium is read into the computer system and executed. You may perform the process of each part. Here, the “computer system” includes an OS and hardware such as peripheral devices.
Further, the “computer system” includes a homepage providing environment (or display environment) if a WWW system is used.

  You may make it implement | achieve the transmission apparatus and receiving apparatus in embodiment mentioned above with a computer. In that case, a program for realizing this function may be recorded on a computer-readable recording medium, and the program recorded on this recording medium may be read into a computer system and executed. Here, the “computer system” includes an OS and hardware such as peripheral devices. The “computer-readable recording medium” refers to a storage device such as a flexible medium, a magneto-optical disk, a portable medium such as a ROM and a CD-ROM, and a hard disk incorporated in a computer system. Furthermore, the “computer-readable recording medium” dynamically holds a program for a short time like a communication line when transmitting a program via a network such as the Internet or a communication line such as a telephone line. In this case, a volatile memory inside a computer system serving as a server or a client in that case may be included and a program held for a certain period of time. Further, the program may be a program for realizing a part of the above-described functions, and may be a program capable of realizing the functions described above in combination with a program already recorded in a computer system. You may implement | achieve using programmable logic devices, such as FPGA (Field Programmable Gate Array).

The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and includes design changes and the like without departing from the gist of the present invention.
The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and includes designs and the like that do not depart from the gist of the present invention.

DESCRIPTION OF SYMBOLS 100 ... Transmission apparatus, 101 ... Frame multiplexing part, 102 ... Encoding part, 103 ... Transmission part, 105 ... Optical transmission line, 120 ... Reception apparatus, 121 ... Reception part, 122 ... Deframe part, 123 ... Decoding part

Claims (8)

An optical transmission device in multicarrier transmission using OTUCn (Optical Channel Transport Unit Cn),
A frame multiplexing unit that accommodates client signals in TS (Tributary Slot / Time Slot) and frames them;
A transmission apparatus comprising: an encoding unit that encodes a payload area between lanes using the TS as an encoding unit.   The transmission apparatus according to claim 1, wherein the encoding unit performs encoding with a redundancy set according to the client signal.   The transmission apparatus according to claim 1, wherein the frame multiplexing unit accommodates the parity accommodation information obtained by the encoding in an overhead area.   The transmission apparatus according to claim 3, wherein the frame multiplexing unit accommodates the parity accommodation information in a PSI (Payload Structure Identifier) area in an overhead area.   The transmission apparatus according to claim 3, wherein the frame multiplexing unit accommodates the parity accommodation information in a RES (Reserved for future international standardization) region in an overhead region.   The transmission apparatus according to claim 1, wherein the encoding unit encodes information of an area where a copy is not sent to each lane in the overhead area.   The transmission apparatus according to claim 1, wherein the encoding unit generates and stores a copy of the same area in each lane for information related to alarm transfer in the overhead area. A transmission method in multi-carrier transmission using OTUCn (Optical Channel Transport Unit Cn),
A transmission method in which a client signal is accommodated in a TS (Tributary Slot / Time Slot) and framed, and a payload area is encoded between lanes using the TS as an encoding unit.

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