JP2017059896A - Device and method for frame transmission - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a frame transmission method without need of providing a large reception buffer.SOLUTION: At the reception side, based on first client signal accommodation information (MSI-α) on a first multiframe of an optical transmission network (OTN), a client signal is accommodated into the payload of a plurality of OTN frames in the first multiframe. Also, second client signal accommodation information on a second multiframe which is transmitted after the first multiframe is allocated to the overhead of the plurality of OTN frames of the first multiframe and transmitted. At the reception side, the first multiframe is received, so that second client signal accommodation information is generated from the overhead of the plurality of OTN frames which configure the first multiframe. Based on the second client signal accommodation information, a client signal is separated from the second multiframe which is received after.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a frame transmission apparatus and method for transmitting a frame storing digital data, and more specifically, conforms to “Optical Transport Network” (OTN) which is a communication standard used in a backbone communication network. The present invention relates to a frame transmission apparatus and a frame transmission method for transmitting a frame.

  The current backbone communication network is an optical transport network (OTN) recommended by the International Telecommunication Union-Telecommunication Standardization Sector (ITU-T). ) Is widely used. OTN is transparent to accommodate a variety of client signals such as Ethernet (registered trademark) and Synchronous Digital Hierarchy (SDH), monitoring and control systems that are aware of wavelength division multiplexing (WDM) signal management. Defines the bit rate, mapping method, etc. (See Non-Patent Document 1)

  FIG. 1 is a diagram for explaining the frame structure of OTN. Note that the overhead of storing address information and various monitoring signals used when transmitting data is added to the beginning of various frames constituting the OTN frame, but in the following, the overhead is abbreviated as OH and stored in OH. Information and signals transmitted in this manner will be abbreviated as OH information. The OPUk frame 110 includes a payload area 112 in which a client signal 100 such as Ethernet (registered trademark) or SDH is accommodated, and an OPUk (Optical Channel Payload Unit-k) OH area 114 that is OH that provides accommodation information of the client signal. Composed. The ODUk frame 110 is provided with an ODUk (Optical Channel Data Unit-k) OH124, which is an OH that provides (stores) signals for end-to-end path monitoring and performance monitoring. Is done. The ODUk frame 120 provides (stores) signals for maintenance and operation functions necessary for transmission of an optical channel, which is signal transmission between 3R playback (Re-amplification, reshaping, and retiming) points. Transport Unit-k) OH 134 and a code 136 for providing a Forward Error Correction (FEC) function are added to form an OTUk frame 130.

  The OTN has a function of collecting a plurality of OTN frames as one group and transmitting predetermined OH information using the one group of OTN frames. A plurality of OTN frames used for transmission of the predetermined OH information is called “multiframe”, and transmission of predetermined OH information using a plurality of OTN frames constituting the multiframe is called multiframe.

  Hereinafter, the concept of multiframe will be described by taking “Multiplex Structure Identifier” (MSI) transmitted using a plurality of OPUk OHs as an example.

  FIG. 2A is a diagram for explaining the OTN frame structure described in FIG. 1 in more detail. Frame synchronization (FA) OH230 is defined in the first to seventh columns of the first row of the OTN frame, and OTUk OH134 is defined in the following eight to fourteenth rows. ODUk OH124 is defined in the 1st to 14th columns of the 2nd to 4th rows. The OPUk OH 114 is defined in the 15th to 16th columns of the 1st to 4th rows, and the payload 112 is defined in the 17th to 3824th columns of the 1st to 4th rows. An OTUk FEC code 136 is defined in the 3825 to 4080 columns of the first to fourth rows.

  FIG. 2B shows the configuration of the FA OH 230 in the OTN frame. In FA OH, a frame alignment signal (FAS) 232 is defined in the first 6 bytes (corresponding to the first row to the sixth column of the OTN frame), followed by one byte (in the first row, the seventh column). A multi-frame alignment signal (MFAS) 234 is defined. MFAS is equivalent to a counter, and the value of MFAS (MFAS value) is incremented from 0 (“0000 0000” in the bit string) to 255 (“1111 1111”) each time one OTN frame 130 is transmitted. To be granted. When the MFAS value reaches 255, it returns to 0 and is incremented again. A group of OTN frames having an MFAS value of 0 to an OTN frame of No. 255 can constitute a “multiframe”.

  FIG. 2 (c) shows a more detailed configuration of the OPUk OH 114, and particularly shows a configuration of OPU4 OH information transmitted using a plurality of OPU4 OHs. The information of OPU4 OH is OH information transmitted in a multi-frame manner. In each of the 15th and 16th columns of the first to third rows of the OTN frame, a stuff control (Justification Control, JC) byte is defined. Payload Structure Identifier (PSI) is defined in the 15th column of the 4th row of the OTN frame, and OPU Multi-Frame Identifier (OMFI) is defined in the 16th column of the 4th row. Yes. Although only one PSI (one byte, called PSI byte) is defined in one OTN frame 130, PSI bytes transmitted in 256 OTN frames constituting one multiframe are accumulated. OH information (OPU4 OH information (256 bytes in total)) as shown in the right diagram of FIG. 2C is formed. As described above, the OPU4 OH information transmitted in a multi-frame using a multi-frame composed of 256 OTN frames is one of the OH information.

  Among the information of OPU4 OH, 80 bytes obtained by accumulating the PSI bytes of the OTN frames whose MFAS 234 values are 2 to 81 constitute a multiplex structure extension (MSI) 244. The MSI stores information indicating how client signals are accommodated in the OPUk payload 112. More specifically, each byte of the MSI indicates whether the tributor slot (TS) is placed in the OPUk payload 112, and if a TS is placed, the TS tributary port number (TS destination (TS The number of the client accommodated in TS is a slot to which a tributary unit to which a client signal is mapped is further mapped.

  As described above, OTN provides a function for accommodating a variety of client signals and transmitting the network. However, client signal accommodation information is transmitted using an 80-byte MSI obtained from one multiframe. Shared between devices. The frame transmission apparatus on the transmitting side forms 256-byte OH information (OPU4 OH information) shown in the right diagram of FIG. 2C from the 80-byte MSI provided from the control unit, and the MFAS in FA OH The first byte of the OH information in the PSI byte of the OTN frame with the value of 0 set to 0, the second byte of the OH information in the PSI byte of the OTN frame with the value of MFAS set to 1, ... The 256th byte of the OH information is sequentially added to the PSI byte of the OTN frame in which the MFAS value is set to 255.

  On the other hand, the frame transmission apparatus on the receiving side, based on each OH of the received OTN frame, includes PSI (information of OPU4 OH, which is OH information (right of FIG. 2 (c))) consisting of 256 bytes and 80 included therein. Form the MSI of the byte and separate the client signal from the OTN frame based on the formed MSI.

  FIGS. 3A to 3C are diagrams for explaining client signal separation processing in the OTN framer of the frame transmission device on the reception side. The OTN framer of the frame transmission apparatus includes a reception buffer 386, a control unit 382, and a separator 388. Normally, a frame transmission apparatus has both a function for transmitting and receiving an OTN frame, but for the sake of simplification of description, it will be described as a configuration having only a reception function. The reception buffer 386 of the OTN framer sequentially stores the received OTN frames, and stores at least one multiframe (that is, 256) OTN frames necessary for correctly recognizing the MSI (step b1) (FIG. 3 ( a)). When at least one multi-frame OTN frame is stored in the reception buffer 386, the control unit 382 accumulates one multi-frame OTN frame PSI byte to form 256-byte PSI (OH information), An 80-byte MSI included in the PSI is formed (step b2) (FIG. 3B). The 80 byte MSI contained in the PSI is provided to the separator 388. The separator 388 separates the client signal from each of the OTN frames for one multiframe stored in the reception buffer 386 based on the MSI provided from the control unit (step b3) (FIG. 3C).

International Telecommunication Union, “Interfaces for the optical transport network,” Recommendation ITU-T G.709 / Y.1331, February 2012

  As described above, MSI is obtained by accumulating PSI bytes in one multi-frame OTN frame. Therefore, in order for the receiving side frame transmission apparatus to separate the client signal from the OTN frame, the frame transmission apparatus waits for the arrival of at least one multi-frame OTN frame, forms an MSI, and uses the MSI to perform 1 The client signal was separated from the OTN frame included in the multiframe. For this reason, the transmission apparatus needs to include a large reception buffer that accumulates at least one multi-frame OTN frame, which increases the cost of the transmission apparatus and increases power consumption.

  The present invention has been made in view of such problems, and an object thereof is to provide a frame transmission apparatus and method that do not require a large reception buffer. It is another object of the present invention to provide a frame transmission apparatus and method that are reduced in cost and power consumption.

  In order to achieve such an object, the present invention is a frame transmission apparatus that transmits and / or receives a frame of an optical transmission network (OTN). The frame transmission apparatus is configured to accommodate a client signal in a payload using client signal accommodation information transmitted using at least one previous multiframe when forming an OTN frame constituting the multiframe. . In other words, the frame transmission apparatus is configured to transmit client signal accommodation information when accommodating a client signal in the payload of an OTN frame that constitutes a multiframe in a multiframe manner at least in the previous multiframe. . In addition, when separating the client signal from the OTN frame constituting the multiframe, the frame transmission apparatus uses the client signal accommodation information received in at least one previous multiframe, from the payload of the OTN frame constituting the multiframe. It is configured to separate client signals.

  One aspect of the present invention is a frame transmission apparatus that transmits an OTN frame, and includes means for generating client signal accommodation information when accommodating client signals in payloads of a plurality of OTN frames constituting a multiframe; The first client signal accommodation information when accommodating client signals in the payloads of the plurality of OTN frames constituting the multiframe and the plurality of OTNs constituting the second multiframe transmitted after the first multiframe The second client signal accommodation information when accommodating the client signal in the payload of the frame is held, and the client signal is sent to the payloads of a plurality of OTN frames constituting the first multiframe based on the first client signal accommodation information Accommodating, dividing the second client signal accommodation information into the first multi And means for allocating the overhead of a plurality of OTN frames frame.

  One embodiment of the present invention is a frame transmission apparatus that receives an OTN frame, and sequentially buffers at least a part of overhead of a plurality of OTN frames constituting the received multiframe; A second multi-frame which is a means for generating client signal accommodation information for the accommodation of client signals in the payloads of a plurality of OTN frames constituting the multi-frame from the overhead of the OTN frame, and is received after the first multi-frame. Means for generating client signal accommodation information about accommodation of client signals in payloads of a plurality of OTN frames constituting a plurality of OTN frames constituting a first multiframe, and a plurality of pieces constituting a multiframe OTN frame pay And a payload of a plurality of OTN frames constituting the second multiframe based on client signal accommodation information generated from the overhead of the plurality of OTN frames constituting the first multiframe. Means for separating the client signal from

  Further, one embodiment of the present invention is a frame transmission device that transmits and receives an OTN frame, and has both a function of transmitting an OTN frame and a function of receiving an OTN frame.

One embodiment of the present invention is a frame transmission method for transmitting an OTN frame.
One embodiment of the present invention is a frame transmission method for receiving an OTN frame.
One embodiment of the present invention is a frame transmission method for transmitting and receiving an OTN frame.
In one embodiment, the client signal accommodation information is a multiple structure extension (MSI).

  As described above, according to the present invention, it is possible to provide a frame transmission apparatus and method that do not require a large reception buffer, and to provide a frame transmission apparatus and method that reduce cost and power consumption. be able to.

It is a figure explaining the frame structure of OTN. (A) is a diagram for explaining the OTN frame structure in more detail, (b) is a diagram showing the configuration of FA OH in the OTN frame, and (c) is an OPU4 OH transmitted using a plurality of OPU4 OHs. It is a figure which shows the structure of this information. (A)-(c) is a figure explaining the client signal separation process in the OTN framer of the conventional frame transmission apparatus. (A) is a figure explaining the structure of the frame transmission system which concerns on one Embodiment of this invention, (b) is a figure explaining the structure of the OTN framer which concerns on one Embodiment of this invention. (A) is a figure explaining the conventional OTN frame production | generation process, (b) is a figure explaining the OTN frame production | generation process which concerns on one Embodiment of this invention. (A)-(c) is a figure explaining the separation process of the client signal which concerns on one Embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The frame transmission apparatus according to the present embodiment is an apparatus that transmits an OTN frame (a frame specified (defined) by the OTN standard). A frame transmission apparatus for transmitting an OTN frame accommodates a client signal in a payload using client signal accommodation information transmitted using at least one previous multiframe when forming an OTN frame constituting a multiframe. It is configured as follows. That is, when a frame transmission apparatus that transmits an OTN frame forms an OTN frame that constitutes a multiframe, client signal accommodation information (for example, multiplexing information) about the accommodation of the client signal in the payload of the OTN frame that constitutes the multiframe. A structure extension (MSI)) is configured to be transmitted in a multiframe using an OTN frame that forms at least one previous multiframe.

  On the other hand, when a frame transmission apparatus that receives a frame of an optical transmission network (OTN) separates a client signal from an OTN frame that constitutes a multiframe, a plurality of OTNs that constitute a multiframe that is at least one before the multiframe The client signal accommodation information received after being converted into a multiframe by a frame is used to separate the client signal from the payload of the OTN frame constituting the multiframe.

  FIG. 4A is a diagram illustrating the configuration of a frame transmission system including the frame transmission apparatus according to the present embodiment. 4A includes a plurality of frame transmission apparatuses A420, a plurality of frame transmission apparatuses B460, and a network 440 that connects these frame transmission apparatuses. Normally, a frame transmission apparatus has both a function for transmitting and receiving an OTN frame, but for the sake of simplicity of explanation, the frame transmission apparatus A420 has a configuration having only a transmission function, and the frame transmission apparatus B460 has a reception function. A description will be given assuming that the configuration has only functions.

  The transmission-side frame transmission apparatus A 420 includes an OTN framer 422 that accommodates a client signal in the OTN frame having the configuration shown in FIG. 1, and an optical transmitter that converts an OTN frame of an electrical signal output from the OTN framer into an optical signal ( TX) 424. In addition, the frame transmission apparatus A 420 normally includes an optical wavelength division multiplexing (WDM) apparatus 426 that wavelength-multiplexes a set of a plurality of OTN framers 422 and an optical transmitter 424 and optical signals having different wavelengths output from the plurality of optical transmitters. With. The wavelength-multiplexed optical signal is transmitted to the network 440.

  The frame transmission device B 460 on the receiving side includes an optical receiver (RX) 464 that converts an optical signal received through the network 440 into an OTN frame of an electrical signal, and an OTN framer 462 that separates a client signal from the OTN frame. Prepare. The frame transmission apparatus B 460 normally includes a set of a plurality of OTN framers and optical receivers, and an optical wavelength multiplexing apparatus (WDM) 466. Since the optical signal received through the network 440 is wavelength-multiplexed, it is separated into an optical signal having a single wavelength by an optical wavelength multiplexing (WDM) device 466. Each optical signal is converted into an OTN frame of an electrical signal by the optical receiver 464, and then the client signal is separated by the OTN framer 462.

  FIG. 4B is a diagram illustrating the configuration of the OTN framer according to the present embodiment. Note that, unlike the description of FIG. 4A, in the universal implementation, the OTN framer has both a client signal accommodation function and a separation function. Therefore, FIG. 4B shows the configuration of the OTN framer (422, 462) equipped with both the accommodation function and the separation function. The OTN framer (422, 462) receives the OTN frame of the electrical signal output from the optical receiver 464, receives the OTN frame stored in the reception buffer, and receives the OTN frame stored in the reception buffer. And a separator 488 that separates the client signal contained in the OPUk payload, receives the client signal, stores it in the OPUk payload, forms a OTN frame by adding a predetermined OH, and outputs it to the optical transmitter 424. A multiplexer 484 and a control unit 482 are provided. The reception buffer 486 may be an OH reception buffer that stores only the OH (OPUk-OH, ODUk-OH, OTUk-OH, FAOH) of the received OTN frame. When the reception buffer 486 stores only the OH of the received OTN frame, the received OTN frame is supplied to the reception buffer 486 and the separator 488 in parallel.

  First, the accommodation processing of the client signal in the OTN framer in the frame transmission apparatus that transmits the OTN frame will be described in detail with reference to FIG. 5, and then the OTM of the frame transmission apparatus that receives the frame of OTN) with reference to FIG. The client signal separation processing in the framer will be described in detail.

  FIG. 5A is a diagram illustrating a conventional OTN frame generation process (accommodation process), and FIG. 5B is a diagram illustrating an OTN frame generation process (accommodation process) according to an embodiment of the present invention. Note that, similar to the OTN framer in the transmission-side frame transmission apparatus of the present embodiment described with reference to FIG. 4B, the OTN framer in the transmission-side frame transmission apparatus that performs the conventional accommodation processing includes the control unit and A multiplexing unit is provided.

(Containment processing)
In the conventional accommodation process, as shown in FIG. 5A, the control unit of the OTN framer forms a 256-byte PSI including the 80-byte MSI that is the accommodation information of the client signal and provides it to the multiplexer ( Step a1). Next, the multiplexer of the OTN framer accommodates the received client signal in the OPUk payload 112 according to the MSI provided from the control unit, and adds OPUk OH114, ODUk OH124, OTUk OH134, OTUk FEC136, and FA OH230 to the OPUk payload. Then, the OTN frame 130 is formed (step a2). Here, the PSI byte 242 of the OPUk OH 114 of the OTN frame 130 is provided with 1-byte information corresponding to the MFAS value in the 256-byte PSI including the 80-byte MSI provided from the control unit. . Thereafter, the multiplexer of the OTN framer outputs the formed OTN frame to the optical transmitter (step a3). As described above, in the conventional accommodation processing, client signal accommodation information regarding the accommodation of the client signal in the payload of the OTN frame is multiplexed using a plurality of 256 OTN frames in the multiframe having the OTN frame as a constituent element. Frame and transmit.

  On the other hand, in the accommodation process of the present embodiment, as shown in FIG. 5B, the control unit 482 of the OTN framer 422 of the frame transmission device A420 includes an MSI of 80 bytes that is the accommodation information of the client signal. A 256-byte PSI is formed and provided to the multiplexer (step A1). Next, the multiplexer of the OTN framer holds the latest MSI (MSI-β) provided from the control unit and the MSI (MSI-α) provided before MSI-β. The multiplexer of the OTN framer accommodates the received client signal in the OPUk payload 112 according to MSI-α, adds OPUk OH114, ODUk OH124, OTUk OH134, OTUk FEC136, and FA OH230 to the OPUk payload, and adds the OTN frame 130. Form (step A2). Here, the PSI byte 242 of the OPUk OH 114 of the OTN frame 130 includes the MFAS of the PSI obtained by replacing the 80-byte MSI-α included in the 256-byte PSI provided by the control unit with the MSI-β. One byte of information corresponding to the value is given. Thereafter, the multiplexer of the OTN framer outputs the formed OTN frame to the optical transmitter (step A3). As described above, in the accommodation processing according to the present embodiment, client signal accommodation information (MSI) regarding the accommodation of the client signal in the payload of the OTN frame is displayed in the multiframe before the multiframe having the OTN frame as a component. Multi-frame transmission is performed using a plurality of 256 OTN frames. When the client signal is accommodated in the payload of the OTN frame that constitutes the multiframe, the client signal accommodation information (MSI) that is transmitted after being converted into a multiframe by a plurality of OTN frames that constitute the multiframe transmitted before the multiframe. The accommodation process is performed based on the above.

  As described above, in the conventional accommodation processing, the correspondence between the client signal accommodation information indicated by the MSI and the accommodation state of the client signal contained in the OPUk payload is the same in any multiframe. In the example of FIG. 5A, MSI-α is transmitted in multiframes 1 and 2, and the client signal accommodation state of the OTN frame included in the multiframe matches the information of MSI-α. On the other hand, MSI-β is sent in multiframe 3, and the client signal accommodation state of the OTN frame included in multiframe 3 matches the information in MSI-β.

  On the other hand, in the accommodation process of this embodiment, in each multiframe, the client signal is accommodated in the OPUk payload using the MSI sent in at least the previous multiframe. In the example of FIG. 5B, in the multiframe 2, the client signal is accommodated in the OPUk payload according to the MSI-α transmitted in the previous multiframe 1, while the PSI byte of the OPUk OH contains the latest Contains information obtained by dividing MSI-β for each byte.

(Separation process)
In the conventional separation process, as described with reference to FIGS. 3A to 3C, the OTN framer of the frame transmission apparatus on the receiving side receives at least one multiframe (that is, 256) OTN frames. Store in the buffer (step b1). Next, PSI bytes of one multi-frame OTN frame are accumulated to form 256 bytes of PSI (OH information), and 80 bytes of MSI included in the PSI is formed (step b2). The client signal is separated from each multi-frame OTN frame (step b3).

  On the other hand, in the separation processing of the present embodiment, the reception buffer 486 of the OTN framer 462 of the frame transmission device 460 on the reception side sequentially stores the received OTN frame (OH), and the control unit 482 of the OTN framer The MFAS value and the PSI byte are received from the OTN frame stored in the reception buffer, and a 256-byte PSI including the MSI is formed (step B1-1) (FIG. 6A).

  When the control unit 482 of the OTN framer 460 confirms that the OTN frame (of OH) for one multiframe period (that is, 256) is stored in the reception buffer based on the MFAS value of the received OTN frame, the MSI Recognize that -β has been successfully acquired, and provide the MSI to the separator (step B2) (FIG. 6B). Here, the reception buffer does not need to store an OTN frame for one multiframe period.

  In parallel with the storage of the received OTN frame (OH), the separator 488 of the OTN framer 460 is sent by at least one previous multi-frame and is based on the MSI-α previously provided by the control unit 482. Then, the client signal is separated from the OTN frame and output (step B1-1) (FIG. 6A).

  Based on the MSI-β provided from the control unit 482, the separator 488 of the OTN framer 460 separates and outputs the client signal from the OTN frame included in the next arrived multiframe (step B3) (FIG. 6 ( c)).

  As described above, the frame transmission apparatus according to the present embodiment uses the client signal accommodation information (MSI) transmitted using at least the previous multiframe when forming the OTN frame constituting the multiframe. The client signal is accommodated in the payload. In addition, when the frame transmission apparatus separates the client signal from the OTN frame constituting the multiframe, the client signal is separated from the payload using the client signal accommodation information (MSI) transmitted in at least one previous multiframe. To do.

  According to the frame transmission apparatus of the present embodiment, the reception-side frame transmission apparatus (provided with the OTN framer) has a minimum reception buffer required for the reception process of the OTN frame and the process of separating the client signal from the OTN frame. The reception buffer size may be smaller than that of the conventional frame transmission apparatus. That is, the transmission apparatus according to the present embodiment does not need to include a large reception buffer, so that the transmission apparatus can be reduced in cost and power consumption. Furthermore, the client signal can be separated from all received OTN frames even without a large reception buffer.

  In the example using FIGS. 5 and 6, the MSI transmits using the multiframe immediately before the multiframe in which the client signal is accommodated by using the accommodation information of the client signal corresponding to the MSI. However, the present invention is not limited to this. For example, if the MSI pre-transmission timing is shared in advance between the transmission-side frame transmission apparatus and the reception-side frame transmission apparatus, the MSI not only transmits using the previous multiframe. Further, transmission may be performed using a multiframe before that.

100 Client signal 110 OPUk frame 112 OPUk payload 114 OPUk overhead 120 ODUk frame 124 ODUk overhead 130 OTUk frame 134 OTUk overhead 136 OTUk FEC
230 Frame synchronization (FA) overhead 232 Frame synchronization signal (FAS)
234 Multi-frame synchronization signal (MFAS)
242 Payload structure identifier (PSI)
244 Multiple Structure Extension (MSI)
246 OPU Multiframe Identifier (OMFI)
300, 400 Optical transmission system 320, 360, 420, 460 Transmission device 322, 362, 422, 462 OTN framer 340, 440 Network 324, 424 Optical transmitter 326, 366, 426, 466 Optical wavelength multiplexing device 364, 464 Optical reception 382, 482 Control unit 484 Multiplexer 386, 486 OH reception buffer 388, 488 Separator

Claims (6)

A frame transmission device for transmitting an optical transmission network (OTN) frame,
Means for generating client signal accommodation information when accommodating client signals in payloads of a plurality of OTN frames constituting a multiframe;
First client signal accommodation information when accommodating client signals in the payloads of a plurality of OTN frames constituting the first multiframe and a plurality constituting the second multiframe transmitted after the first multiframe The second client signal accommodation information when the client signal is accommodated in the payload of the OTN frame is held, and the client to the payloads of the plurality of OTN frames constituting the first multiframe based on the first client signal accommodation information A frame transmission apparatus comprising: means for accommodating a signal; dividing second client signal accommodation information; and assigning the second client signal accommodation information to overhead of a plurality of OTN frames of the first multiframe. A frame transmission device for receiving an optical transmission network (OTN) frame,
Means for sequentially buffering at least part of the overhead of a plurality of OTN frames constituting the received multiframe;
A means for generating client signal accommodation information about the accommodation of client signals in the payloads of a plurality of OTN frames constituting a multiframe from the overhead of a plurality of OTN frames buffered sequentially, and is received after the first multiframe. Means for generating client signal accommodation information about accommodation of client signals in payloads of a plurality of OTN frames constituting the second multiframe from overheads of the plurality of OTN frames constituting the first multiframe;
A means for separating a client signal from payloads of a plurality of OTN frames constituting a multiframe, wherein the second is based on client signal accommodation information generated from the overhead of the plurality of OTN frames constituting the first multiframe. And a means for separating a client signal from payloads of a plurality of OTN frames constituting a multiframe. A frame transmission device for transmitting and receiving optical transmission network (OTN) frames,
Means for generating client signal accommodation information when accommodating client signals in payloads of a plurality of OTN frames constituting a multiframe;
First client signal accommodation information when accommodating client signals in the payloads of a plurality of OTN frames constituting the first multiframe and a plurality constituting the second multiframe transmitted after the first multiframe The second client signal accommodation information when the client signal is accommodated in the payload of the OTN frame is held, and the client to the payloads of the plurality of OTN frames constituting the first multiframe based on the first client signal accommodation information Means for accommodating the signal, dividing the second client signal accommodation information and assigning it to the overhead of the plurality of OTN frames of the first multiframe;
Means for sequentially buffering at least part of the overhead of a plurality of OTN frames constituting the received multiframe;
Means for generating client signal accommodation information for accommodation of client signals in payloads of a plurality of OTN frames constituting a multi-frame from the overhead of a plurality of OTN frames buffered sequentially, wherein the second client signal accommodation information is Means for generating from the overhead of a plurality of OTN frames constituting a first multiframe received before two multiframes;
A means for separating a client signal from payloads of a plurality of OTN frames constituting a multiframe, based on second client signal accommodation information generated from an overhead of a plurality of OTN frames constituting a first multiframe, Means for separating a client signal from payloads of a plurality of OTN frames constituting a second multiframe;
A frame transmission apparatus comprising: A frame transmission method for transmitting an optical transmission network (OTN) frame,
The generation of client signal accommodation information when accommodating client signals in the payloads of a plurality of OTN frames constituting a multiframe, and accommodating the client signals in the payloads of a plurality of OTN frames constituting the first multiframe First client signal accommodation information and second client signal accommodation when accommodating client signals in the payloads of a plurality of OTN frames constituting the second multiframe transmitted after the first multiframe Including generating information, and
Based on the first client signal accommodation information, a client signal is accommodated in the payloads of a plurality of OTN frames constituting the first multiframe, and the second client signal accommodation information is divided into a plurality of first multiframes. Allocating to the overhead of the OTN frame of the frame. A frame transmission method for receiving an optical transmission network (OTN) frame,
Sequentially buffering at least some of the overhead of multiple OTN frames that comprise the received multiframe;
The client signal accommodation information is generated for the accommodation of the client signal in the payload of the plurality of OTN frames constituting the multiframe from the overhead of the plurality of OTN frames sequentially buffered, and is received after the first multiframe. Generating client signal accommodation information about accommodation of client signals in payloads of a plurality of OTN frames constituting the second multiframe from overheads of the plurality of OTN frames constituting the first multiframe; ,
Separating the client signals from the payloads of the plurality of OTN frames constituting the multi-frame, and based on the client signal accommodation information generated from the overheads of the plurality of OTN frames constituting the first multi-frame. Separating the client signal from the payloads of a plurality of OTN frames constituting the multiframe. A frame transmission method for transmitting an optical transmission network (OTN) frame,
The generation of client signal accommodation information when accommodating client signals in the payloads of a plurality of OTN frames constituting a multiframe, and accommodating the client signals in the payloads of a plurality of OTN frames constituting the first multiframe First client signal accommodation information and second client signal accommodation when accommodating client signals in the payloads of a plurality of OTN frames constituting the second multiframe transmitted after the first multiframe Including generating information, and
Based on the first client signal accommodation information, a client signal is accommodated in the payloads of a plurality of OTN frames constituting the first multiframe, and the second client signal accommodation information is divided into a plurality of first multiframes. Allocating the overhead of OTN frames
Sequentially buffering at least some of the overhead of multiple OTN frames that comprise the received multiframe;
The client signal accommodation information is generated for the accommodation of the client signal in the payload of the plurality of OTN frames constituting the multiframe from the overhead of the plurality of OTN frames sequentially buffered, and is received after the first multiframe. Generating second client signal accommodation information on accommodation of client signals in payloads of a plurality of OTN frames constituting the second multiframe from overheads of the plurality of OTN frames constituting the first multiframe. , That,
Separating client signals from payloads of a plurality of OTN frames constituting a multiframe, based on second client signal accommodation information generated from overhead of a plurality of OTN frames constituting a first multiframe, Separating the client signal from the payloads of a plurality of OTN frames constituting the second multi-frame.