JP2018125775A - Transmission quality measurement method - Google Patents

Abstract

The present invention provides a technique capable of monitoring transmission quality for each client signal unit or each unit of a client signal in a transmission method in which a logical transmission path is formed by bundling one or more transmission media. A transmission quality measurement method according to an embodiment includes a transmission side device that transmits a signal input from one or more channels through one or more physical links, and the transmission side device from the transmission side device through the physical link. A transmission quality measuring method in which a transmission system comprising a receiving device for receiving a signal measures the quality of transmission via the physical link, wherein the transmitting device divides the signal into units of transmission code blocks. And a transmission step of measuring the transmission error rate of the signal based on a part of the signal of the transmission code block unit received from the transmission side device. [Selection] Figure 1

Description

  The present invention relates to a transmission quality measurement method.

  In March 2016, the Implementation Agreement 1.0 (hereinafter referred to as “IA1.0”) of Flex Ethernet (registered trademark, hereinafter referred to as “FlexE”) was issued in the Optical Internetworking Forum (hereinafter referred to as “OIF”). For example, refer nonpatent literature 1). FlexE is one or more Media Access Control (hereinafter referred to as “MAC”) in 5 Gigabit / s units on a transmission path in which two or more 100 Gigabit Ethernet (hereinafter referred to as “100 GbE” or “100 GbE-PHY”) is bundled. This is a standardization technique for setting a rate and independently transmitting a client signal for each MAC rate.

  In FlexE, 10G, 40G, m × 25G (m is an integer of 1 or more) as a MAC rate, and 10 Gigabit Ethernet (hereinafter referred to as “10GbE”) or 40 Gigabit Ethernet (hereinafter referred to as “10GbE”) using a 64b / 66b transmission code block as a client signal. 40GbE ") is assumed (for example, see" 5.1 Requirements "in Non-Patent Document 1). The outline of FlexE will be described below.

  FIG. 14 is an image diagram of FlexE when four 100 GbE are bundled. This bundle of 100 GbE-PHYs is called a FlexE Group, and client signals (signals such as 10 GbE and 40 GbE) input / output from the left and right are called FlexE Clients. Further, a function unit that performs input / output between the FlexE Group and the FlexE Client is called a FlexE Shim, and has a function of mapping the FlexE Client to the FlexE Group (or demapping from the FlexE Group).

  FIG. 15 is a diagram illustrating a configuration of a frame transmitted in the FlexE Group. FIG. 16 is a diagram illustrating a configuration of a multi-frame transmitted by FlexE. In FlexE, FlexE Shim forms a single-line Master Calendar composed of 64b / 66b transmission code blocks. In FlexE, each 64b / 66b transmission code block constituting the Master Calendar is called a slot, and the master calendar is divided into sub-calendars composed of 20 slots. Then, the master calendar is distributed to four 100 GbE-PHYs in units of this sub-calendar (see, for example, “6.3 FlexE Calendar” in Non-Patent Document 1).

  One frame is configured by inserting an overhead (Flex OH) of 1 slot for every 1023 sub-calendars allocated to each 100G-PHY (100G PHY # 1 to # 4). Further, one multi-frame is composed of eight frames (see, for example, “6.4 FlexE Overhead and Alignment” in Non-Patent Document 1). On the other hand, the FlexE Client is mapped to the Master Calendar in units of 64b / 66b transmission code blocks.

  FIG. 17 is a diagram illustrating an example of mapping of FlexE Client to Master Calendar. In the following description, each client signal (FlexE Client) mapped to the Master Calendar is called a channel. In FlexE, a client signal of a certain channel may be transmitted by the same 100 GbE-PHY, or may be transmitted by being distributed by a plurality of different 100 GbE-PHYs. FIG. 17 illustrates a case where a client signal of a 10 GbE channel is transmitted by 100G PHY # 1 and a client signal of a 25 GbE channel is transmitted by two 100 GbE-PHYs of 100G PHY # 3 and # 4 ( For example, see “7.4 FlexE Mux Data Flow” of Non-Patent Document 1.)

  In such FlexE, when a failure occurs in a part of 100 GbE-PHY constituting the FlexE Group (for example, when the intensity of the received light has dropped below a threshold, or a certain number of 64b / 66b transmission code blocks are consecutive. The entire FlexE Group is judged to be disconnected. In this case, in all 100 GbE-PHYs, a frame in which a flag indicating the occurrence of a failure is set in an overhead RPF (Remote PHY Fault) area is transmitted. By transmitting and receiving such a frame, the entire FlexE Group transitions to a non-communication state (for example, see “7.5.2 FlexE Demux Fault Handling” in Non-Patent Document 1).

Flex Ethernet Implementation Agreement 1.0 (IA # OIF-FLEX-01.0)

  The main application destination of FlexE is a connection between servers in a data center (hereinafter referred to as “DC”) or between DCs, and FlexE is an ITU-T (International Telecommunication Union Telecommunication Standardization Sector) standard for communication carriers. It is a simple standard compared to Optical Transport Network (hereinafter referred to as “OTN”). Therefore, FlexE has only a function for measuring a transmission quality index (BER: Bit Error Rate) equivalent to Ethernet of 10 GbE or higher. Specifically, it is possible to measure the bit error rate in 100GbE-PHY units using the 2-bit overhead part of the 64b / 66b transmission block code, but monitor the transmission quality in FlexE Client units (channel units). I can't do it. For example, “7.1 FlexE Group Functions” of Non-Patent Document 1 describes that the physical layer (PHY) conforms to the 100G Ethernet standard (Clause 82). However, since Ethernet does not have a concept corresponding to a channel, there is no function for monitoring transmission quality on a channel basis.

  In view of the above circumstances, the present invention relates to a client signal unit (channel unit) or a client signal component unit (Slot unit in FlexE) in a transmission method in which one or more transmission media are bundled to form a logical transmission path. The purpose is to provide a technique capable of monitoring the transmission quality for each.

  One embodiment of the present invention includes a transmission side device that transmits a signal input from one or more channels via one or more physical links, and a reception side that receives the signal from the transmission side device via the physical link. A transmission quality measuring method in which a transmission system comprising a device measures the quality of transmission through the physical link, wherein the transmitting device divides the signal into units of transmission code blocks and transmits And a measuring step in which the receiving side apparatus measures a transmission error rate of the signal based on a part of the transmission code block unit signal received from the transmitting side apparatus.

  One aspect of the present invention is the above-described transmission quality measurement method, wherein the reception-side apparatus measures the transmission error rate based on an overhead signal added to each of the transmission code blocks.

  One aspect of the present invention is the above transmission quality measurement method, wherein the transmission side device stores and transmits a signal of a predetermined pattern in a payload of a part of transmission code blocks, and the reception side device transmits the transmission The transmission error rate is measured by detecting the signal of the predetermined pattern from the payload of the transmission code block received from the side apparatus.

  One aspect of the present invention is the above transmission quality measurement method, wherein the predetermined pattern is a pseudo-random pattern.

  One aspect of the present invention is the above transmission quality measurement method, wherein the transmission code block is a 64b / 66b transmission code block including a 2-bit overhead and a 64-bit payload.

  One aspect of the present invention is the above transmission quality measurement method, wherein the transmission code block is obtained by reconstructing one or more of the 64b / 66b transmission code blocks (64 × n) b / (64 × n + m). B) Transmission code block (m and n are integers of 1 or more).

  One aspect of the present invention is the above-described transmission quality measurement method, wherein the reception-side apparatus adds the transmission error rate acquired for each transmission code block for each channel to obtain the transmission error rate for each channel. taking measurement.

  One aspect of the present invention is the above transmission quality measurement method, wherein signals input from the one or more channels are distributed and transmitted to one or more physical links.

  According to the present invention, in a transmission method in which a logical transmission path is formed by bundling one or more transmission media, transmission quality is improved for each client signal unit (channel unit) or each client signal component unit (Slot unit in FlexE). It becomes possible to monitor.

The block diagram which shows the specific example of a function structure of the transmission side apparatus 1 in 1st Embodiment. The block diagram which shows the specific example of a function structure of the control part 14 in 1st Embodiment. The flowchart which shows the flow of the process in which the transmission side apparatus 1 in 1st Embodiment inserts an overhead with respect to Sub-calendar. The block diagram which shows the specific example of a function structure of the receiving side apparatus 2 in 1st Embodiment. The block diagram which shows the specific example of a function structure of the bit error rate measurement part 24 in 1st Embodiment. The flowchart which shows the flow of the process in which the receiving side apparatus 2 in 1st Embodiment measures a BER value. The figure which shows the operation example of the BER value measurement in 1st Embodiment. The figure which shows the operation example of the BER value measurement in the 1st modification of 1st Embodiment. The figure which shows the operation example of the BER value measurement in the 2nd modification of 1st Embodiment. The figure which shows the operation example of the BER value measurement in the 3rd modification of 1st Embodiment. The block diagram which shows the specific example of a function structure of the transmission side apparatus 1a in 2nd Embodiment. The block diagram which shows the specific example of a function structure of the control part 14a in 2nd Embodiment. The figure which shows the operation example of the BER value measurement in 2nd Embodiment. The image figure of FlexE at the time of bundling four 100GbE. The figure which shows the structure of the flame | frame transmitted by FlexE Group. The figure which shows the structure of the multi-frame transmitted by FlexE. The figure which shows the example of the mapping of FlexE Client to Master Calendar.

  In the following, a FlexE transmission side device and a reception side device capable of monitoring transmission quality for each client signal unit (channel unit) or each client signal configuration unit (Slot unit in FlexE) will be described. Specifically, the transmission side device is a FlexE Shim on the transmission side in FlexE, and the reception side device is a FlexE Shim on the reception side.

<First Embodiment>
FIG. 1 is a block diagram illustrating a specific example of a functional configuration of the transmission-side apparatus 1 in the first embodiment. The transmission side device 1 includes a CPU (Central Processing Unit), a memory, an auxiliary storage device, and the like connected by a bus, and executes a program. The transmission-side device 1 functions as a device including the mapping unit 11, the Sub-calendar 12, the 100 GbE-PHY 13, and the control unit 14 by executing a program. Note that all or part of the functions of the transmission-side apparatus 1 may be realized using hardware such as an application specific integrated circuit (ASIC), a programmable logic device (PLD), or a field programmable gate array (FPGA). . The program may be recorded on a computer-readable recording medium. The computer-readable recording medium is, for example, a portable medium such as a flexible disk, a magneto-optical disk, a ROM, a CD-ROM, or a storage device such as a hard disk built in the computer system. The program may be transmitted via a telecommunication line.

  The mapping unit 11 configures a single-line Master Calendar composed of 64b / 66b transmission code blocks (Slots), distributes client signals input from the client device to a plurality of 100 GbE-PHYs (hereinafter referred to as “PHYs”), and outputs them. By doing so, it has a function of generating a sub-calendar for each PHY.

  For example, in FIG. 1, client signals of k (an integer of 1 or more) channels of Client_1, Client_2,..., Client_k are input to the mapping unit 11, and k client signals are N (an integer of 1 or more). An example of distribution to Sub-calendar 12 is shown. N Sub-calendars 12-1 to 12-N correspond to PHYs 13-1 to 13-N, respectively. In this case, the mapping unit 11 assigns the input k client signals to any one of the N sub-calendars 12. The client signal mapped to the Sub-calendar 12 is output to the PHY 13 corresponding to each Sub-calendar.

  The control unit 14 has a function of generating a frame. Specifically, the control unit 14 configures one frame by inserting an overhead (Flex OH) of 1 slot each time a client signal is mapped to a predetermined number of slots. The control unit 14 may insert multi-frame overhead in addition to overhead of individual frames.

  FIG. 2 is a block diagram illustrating a specific example of a functional configuration of the control unit 14 in the first embodiment. The control unit 14 includes a calendar information acquisition unit 141, an overhead generation unit 142, and an overhead output unit 143. The calendar information acquisition unit 141 acquires calendar information from the mapping unit 11. The calendar information includes information on the client signal and its mapping to the sub-calendar. By referring to the calendar information, the signal value of the client signal, the correspondence between the client signal and the sub-calendar, and the correspondence between the client signal and the channel can be identified. The calendar information acquisition unit 141 outputs the acquired calendar information to the overhead generation unit 142 and the overhead output unit 143.

  The overhead generator 142 generates overhead based on the calendar information. The overhead generation unit 142 outputs the generated overhead to the overhead output unit 143.

  The overhead output unit 143 outputs the overhead output from the overhead generation unit 142 to the corresponding sub-calendar. At this time, the overhead output unit 143 outputs an overhead of 1 slot each time a client signal is assigned to a predetermined number of slots of each Sab-calendar.

  FIG. 3 is a flowchart illustrating a flow of processing in which the transmission-side apparatus 1 in the first embodiment inserts overhead into the sub-calendar. First, the calendar information acquisition unit 141 acquires calendar information from the mapping unit 11 (step S101). The calendar information acquisition unit 141 outputs the acquired calendar information to the overhead generation unit 142. Further, the calendar information acquisition unit 141 notifies the overhead output unit 143 of the correspondence relationship between the frame and the channel identified based on the acquired calendar information.

  The overhead generation unit 142 generates overhead to be inserted into each Sub-calendar based on the calendar information output from the calendar information acquisition unit 141 (step S102). The overhead generation unit 142 outputs the generated overhead to the overhead output unit 143. The overhead output unit 143 inserts the overhead output from the overhead generation unit 142 into a predetermined slot of the corresponding sub-calendar (step S103).

  FIG. 4 is a block diagram illustrating a specific example of a functional configuration of the reception-side apparatus 2 in the first embodiment. The reception side device 2 includes a CPU, a memory, an auxiliary storage device, and the like connected by a bus, and executes a program. The receiving-side device 2 functions as a device including a demapping unit 21, a sub-calendar 22, a 100 GbE-PHY 23, and a bit error rate measuring unit 24 by executing a program. Note that all or part of the functions of the receiving-side apparatus 2 may be realized using hardware such as an ASIC, PLD, or FPGA. The program may be recorded on a computer-readable recording medium. The computer-readable recording medium is, for example, a portable medium such as a flexible disk, a magneto-optical disk, a ROM, a CD-ROM, or a storage device such as a hard disk built in the computer system. The program may be transmitted via a telecommunication line.

  The demapping unit 21 has a function of restoring the client signal of each channel from the signal received by the sub-calendar 22 for each PHY 23. Specifically, the demapping unit 21 generates calendar information based on information stored in the overhead of the frame received in each Sub-calendar. The demapping unit 21 restores the client signal of each channel from the signal received by each Sub-calendar based on the generated calendar information. For example, in the example of FIG. 4, the demapping unit 21 restores k system (corresponding to the number of channels) client signals from the signals received by the N systems Sub-calendar 22. On the other hand, the demapping unit 21 outputs the generated calendar information to the bit error rate measuring unit 24.

  The bit error rate measuring unit 24 measures a BER (Bit Error Rate) value indicating a rate at which a transmission error has occurred in signal transmission via the PHY 23 based on a part of the received signal. For example, in the first embodiment, the bit error rate measurement unit 24 measures the BER value based on the overhead of each transmission block code. Note that the overhead here is different from the overhead inserted at every 20 slots on the transmission side in order to construct a frame. Specifically, the overhead here is a 2-bit overhead in the 64b / 66b transmission block code. Below, in order to distinguish these, the overhead inserted for the structure of a frame is called an overhead block (OHB), and the overhead of each transmission block code is called an overhead signal. The bit error rate measuring unit 24 measures the BER value based on this overhead signal. The bit error rate measurement unit 24 outputs information indicating the measurement result of the BER value measured as described above as measurement information. For example, the bit error rate measurement unit 24 may transmit the measurement information to another device, or may display the measurement information on the display unit when a display unit is provided.

  FIG. 5 is a block diagram illustrating a specific example of a functional configuration of the bit error rate measurement unit 24 in the first embodiment. For example, the bit error rate measurement unit 24 is provided in the reception-side apparatus 2 for each sub-calendar, and each bit error rate measurement unit 24 includes BER value measurement circuits 241-1 to 241-21 for each slot. The BER value measurement circuit 241 calculates a BER value based on the received overhead signal of each slot. Specifically, in the case of a 64b / 66b transmission block code, the overhead signal is received in a pattern of “10” or “01”. If the received overhead signal has a pattern other than these, it means that an error has occurred in transmission of the overhead signal. The BER value measurement circuit 241 identifies the presence or absence of a transmission error for each slot by examining the overhead signal of each slot each time a frame is received. The BER value measurement circuit 241 calculates a BER value for each slot based on the inspection results of a predetermined number of frames received continuously. The BER value measurement circuit 241 outputs the BER value thus obtained as measurement information.

  FIG. 6 is a flowchart showing a flow of processing in which the receiving side apparatus 2 in the first embodiment measures the BER value. First, a frame is received by each sub-calendar. The demapping unit 21 identifies the correspondence between each slot and channel based on the overhead inserted in the OHB of each sub-calendar, and associates the received client signal with each channel.

  The bit error rate measuring unit 24 measures the BER value for each slot based on the signal received in each slot (step S201). The bit error rate measurement unit 24 outputs measurement information indicating the measured BER value (step S202).

  FIG. 7 is a diagram illustrating an operation example of BER value measurement in the first embodiment. The operation example of FIG. 7 shows a situation in which three frames F11 to F13 are received by a certain sub-calendar C1. In this case, the receiving side apparatus 2 acquires the BER value for each slot based on the signals (Slot # 1 to # 20, OHB) included in the received frame.

  According to the receiving-side apparatus 2 of the first embodiment configured as described above, it is possible to acquire, for example, a BER value that can be used for transmission quality monitoring in FlexE in units of slots. As a result, the transmission state of FlexE can be grasped in more detail, and a communication environment with a high service level can be provided. In the first embodiment, the configuration in which the transmission side device 1 and the reception side device 2 have a plurality of physical links (PHYs) is shown. However, the transmission side device 1 and the reception side device 2 of the first embodiment have one configuration. The structure which has a physical link may be sufficient.

<First Modification>
The bit error rate measuring unit 24 of the receiving side device 2 may be configured to measure the BER value for each channel based on the received signal. For example, in this case, the bit error rate measurement unit 24 acquires calendar information from the demapping unit 21. The bit error rate measurement unit 24 identifies the correspondence relationship between the slot and the channel based on the acquired calendar information, and associates each channel with the presence / absence of a transmission error in each slot, thereby obtaining a BER value for each channel. Can be calculated.

  FIG. 8 is a diagram illustrating an operation example of BER value measurement in the first modification example of the first embodiment. FIG. 8 shows Ch. 1, Ch. 2 and Ch. 3 shows that three channels exist and three frames F21 to F23 are received in one sub-calendar C2. In the operation example of FIG. 8, Slots # 1 to # 3 are channels Ch. 1 and Slots # 4 to # 18 are channels Ch. 2, Slots # 19 and # 20 are channels Ch. Each corresponds to 3. For example, in this case, the receiving-side device 2 uses the channel Ch. It may be configured to output as a BER value of 1. Similarly, the receiving-side apparatus 2 sends the sum of the BER values of Slots # 4 to # 18 to the channel Ch. 2 BER value, and the sum of the BER values of Slots # 19 and # 20 is displayed on channel Ch. It may be configured to output as a BER value of 3.

<Second Modification>
In the first embodiment, the bit error rate measurement unit 24 on the reception side includes the BER value measurement circuit 251 for each slot constituting the reception frame. However, the bit error rate measurement unit 24 performs BER measurement for each channel. You may comprise so that a circuit may be provided.

  FIG. 9 is a diagram illustrating an operation example of BER value measurement in the second modification example of the first embodiment. 9 is similar to FIG. 1, Ch. 2 and Ch. 3 shows that three channels F3 to F33 are received by one sub-calendar C3. In the operation example of FIG. 9, the correspondence between each channel and the slot is the same as that of FIG. In this case, the receiving side device 2 uses the channel Ch. The BER values of Slot # 1 to Slot # 3 are calculated by the 1 BER value measuring circuit. Similarly, channel Ch. 2 BER values of Slot # 4 to Slot # 18 are calculated by the BER value measurement circuit of channel 2, and the channel Ch. The BER values of Slot # 19 and Slot # 20 are calculated by the BER value measuring circuit 3. In this case, each BER value measurement circuit may be configured to output the BER value of each slot corresponding to the channel, or may be configured to output the sum of the BER values of each slot.

  FIG. 10 is a diagram illustrating an operation example of the BER value measurement in the third modification example of the first embodiment. 10 is similar to FIG. 1, Ch. 2 and Ch. 3 shows that three channels exist, three frames F41 to F43 are received by a certain sub-calendar C4, and three frames F51 to F53 are received by a certain sub-calendar C5. In the operation example of FIG. 10, the correspondence between each channel and the slot in Sub-calendar C4 is the same as that in FIG. On the other hand, in Sub-calendar C5, Slots # 1 to # 3 are assigned to channel Ch. 2, Slots # 4 to # 20 are channel Ch. Each corresponds to 3.

  In this case, the receiving side device 2 uses the channel Ch. The BER values for Slot # 1 to Slot # 3 of Sub-calendar C4 are calculated by the 1 BER value measurement circuit. On the other hand, channel Ch. 2 BER values are calculated for Slot # 4 to Slot # 18 of Sub-calendar C4 and Slot # 1 to # 3 of Sub-calendar C5, and the channel Ch. 3, the BER values of Slots # 19 and Slot of Sub-calendar C4 and Slots # 4 to # 20 of Sub-calendar C5 are calculated. In this case, each BER value measurement circuit may be configured to output the BER value of each slot corresponding to the channel, or may be configured to output the sum of the BER values of each slot.

Second Embodiment
FIG. 11 is a block diagram illustrating a specific example of a functional configuration of the transmission-side apparatus 1a in the second embodiment. The transmission side device 1a in the second embodiment is different from the transmission side device 1 in the first embodiment in that a mapping unit 11a is provided instead of the mapping unit 11, and a control unit 14a is provided instead of the control unit 14. The mapping unit 11a performs mapping in the first embodiment in that in addition to the client signal, a signal for measuring a bit error (hereinafter referred to as “measurement signal”) is stored in a specific slot designated by the control unit 14a. Different from part 11. The measurement signal may be a fixed pattern signal or a non-fixed pattern signal. As an example of the non-fixed pattern signal, a signal having a pseudo random pattern in which the same random signal appears at a constant period may be used.

  In addition to controlling the frame by inserting overhead, the control unit 14a designates a slot for storing the measurement signal in the mapping unit 11a. The slot specified here may be a specific slot determined in advance, or determined at the time of processing based on a predetermined condition.

  FIG. 12 is a block diagram illustrating a specific example of a functional configuration of the control unit 14a in the second embodiment. The control unit 14a is different from the control unit 14 in the first embodiment in that an overhead generation unit 142a is provided instead of the overhead generation unit 142. The overhead generation unit 142a generates overhead to be inserted in the OHB of each sub-calendar and designates a slot for storing a measurement signal to the mapping unit 11a. The overhead generating unit 142a notifies the receiving side device 2 of the slot storing the measurement signal by storing the slot information designated for the mapping unit 11a in a predetermined area of the generated overhead. Also good.

  FIG. 13 is a diagram illustrating an operation example of BER value measurement in the second embodiment. FIG. 13 shows a situation in which three frames F61 to F63 are received by a certain sub-calendar C6, as in FIG. In the operation example of FIG. 13, a measurement signal is stored in slot # 3 of each frame. Although FIG. 13 shows an example in which the measurement signal is stored in one slot # 3, the measurement signal may be stored in a plurality of slots. In this case, the receiving-side apparatus 2a calculates the BER value for each slot in which the measurement signal is stored by the same method as the receiving-side apparatus 2 of the first embodiment.

  According to the transmission side device 1a and the reception side device 2 of the second embodiment configured as described above, it is possible to identify the presence or absence of a transmission error based on an arbitrary measurement signal instead of the overhead signal of each slot. It becomes possible. By identifying the presence or absence of a transmission error based on such a measurement signal, the receiving-side apparatus 2 can detect a transmission error having pattern dependency with higher accuracy and obtain a BER value with higher accuracy. It becomes possible.

<Modification>
In the second embodiment, the bit error rate measurement unit 24 of the receiving-side device 2 integrates the BER values calculated for each slot for each channel (for example, obtains a sum value), as in the first embodiment. Thus, the BER value for each channel may be output. In this case, the bit error rate measurement unit 24 may include a BER measurement circuit for each channel as in the first embodiment.

  In the first embodiment and the second embodiment, the unit used when the receiving side apparatus 2 calculates the error rate may be a block other than the 64b / 66b transmission code block corresponding to the slot. For example, the unit block may be a (64 × n) b / (64 × n + m) b transmission code block obtained by reconstructing a 64b / 66b transmission code block (n and m are integers of 1 or more). .

  You may make it implement | achieve the transmission side apparatus or receiving side 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 designs and the like that do not depart from the gist of the present invention.

  The present invention includes a transmitting apparatus that transmits client signals input from one or more channels via one or more physical links, and a receiving apparatus that receives client signals from the transmitting apparatuses via the physical links. It is applicable to the transmission system provided.

DESCRIPTION OF SYMBOLS 1, 1a ... Transmission side apparatus, 2, 2a ... Reception side apparatus 11, 11a ... Mapping part, 12 ... Sub-calendar, 13 ... 100GbE-PHY, 14, 14a ... Control part, 141 ... Calendar information acquisition part, 142 , 142a ... overhead generation unit, 143 ... overhead output unit, 21 ... demapping unit, 22 ... Sub-calendar, 23 ... 100GbE-PHY, 24 ... bit error rate measurement unit, 241 ... BER value measurement circuit

Claims (8)

A transmission system comprising: a transmission side device that transmits a signal input from one or more channels via one or more physical links; and a reception side device that receives the signal from the transmission side device via the physical link. A transmission quality measurement method for measuring the quality of transmission over the physical link,
A transmitting step in which the transmitting device divides and transmits the signal into units of transmission code blocks;
A measuring step in which the receiving side apparatus measures a transmission error rate of the signal based on a part of the signal of the transmission code block unit received from the transmitting side apparatus;
A transmission quality measuring method. The receiving side device measures the transmission error rate based on an overhead signal added to each of the transmission code blocks;
The transmission quality measuring method according to claim 1. The transmitting device stores and transmits a signal of a predetermined pattern in the payload of some transmission code blocks,
The receiving device measures the transmission error rate by detecting the signal of the predetermined pattern from the payload of the transmission code block received from the transmitting device;
The transmission quality measuring method according to claim 1 or 2. The predetermined pattern is a pseudo-random pattern;
The transmission quality measurement method according to claim 3. The transmission code block is a 64b / 66b transmission code block composed of a 2-bit overhead and a 64-bit payload.
The transmission quality measuring method according to any one of claims 1 to 4. The transmission code block is a (64 × n) b / (64 × n + m) b transmission code block (m and n are integers of 1 or more) obtained by reconstructing one or more of the 64b / 66b transmission code blocks. is there,
The transmission quality measuring method according to any one of claims 1 to 4. The receiving side apparatus measures the transmission error rate for each channel by adding the transmission error rate acquired for each transmission code block for each channel.
The transmission quality measuring method according to any one of claims 1 to 6. Signals input from the one or more channels are distributed and transmitted to one or more physical links.
The transmission quality measuring method according to any one of claims 1 to 7.

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