JP6660897B2 - Transmission quality measurement method - Google Patents

Description

  The present invention relates to a method for measuring transmission quality.

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

  In FlexE, 10 G, 40 G, m × 25 G (m is an integer of 1 or more) as a MAC rate, and 10 Gigabit Ethernet (hereinafter, “10 GbE”) or 40 Gigabit Ethernet (hereinafter, “10 GbE”) using a 64b / 66b transmission code block as a client signal. 40GbE ”) (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 GbEs 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 and output from the left and right are called FlexE Client. The functional 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 by the FlexE Group. FIG. 16 is a diagram showing a configuration of a multi-frame transmitted by FlexE. In FlexE, FlexE Shim constitutes a row of Master Calendar composed of 64b / 66b transmission code blocks. The individual 64b / 66b transmission code blocks constituting the Master Calendar in FlexE are called Slots, and the Master Calendar is divided into Sub-calendars consisting of 20 Slots. Then, the Master Calendar is divided into four 100 GbE-PHYs in units of the Sub-calendar (for example, see “6.3 FlexE Calendar” in Non-Patent Document 1).

  One frame is configured by inserting 1Slot overhead (Flex OH) for every 1023 sub-calendars allocated to each 100G-PHY (100G PHY # 1 to # 4). Further, one multi-frame is composed of eight frames (for example, see “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 64b / 66b transmission code block units.

  FIG. 17 is a diagram illustrating an example of mapping of the FlexE Client to the 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 distributed and transmitted 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 100 G PHY # 1, and a client signal of a 25 GbE channel is transmitted by two 100 Gb E-PHYs of 100 G PHY # 3 and # 4 ( For example, see “7.4 FlexE Mux Data Flow” in Non-Patent Document 1).

  In such a FlexE, when a failure occurs in a part of the 100 GbE-PHY constituting the FlexE Group (for example, a state where the intensity of the received light has dropped below a threshold, or a certain number of 64b / 66b transmission code blocks are continuously generated). And the entire FlexE Group is determined to be disconnected. In this case, in every 100 GbE-PHY, a frame in which a flag indicating the occurrence of a fault is set in an RPF (Remote PHY Fault) area of the overhead is transmitted. By transmitting and receiving such a frame, the entire FlexE Group transits 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-FLEXE-01.0)

  The main application of FlexE is connection between servers in a data center (hereinafter referred to as “DC”) or between DCs. FlexE is an ITU-T (International Telecommunication Union Telecommunication Standardization Sector) standard for communication carriers. It is a simpler standard than Optical Transport Network (hereinafter referred to as “OTN”) and the like. Therefore, FlexE has only a function of measuring a transmission quality index (BER: Bit Error Rate) equivalent to Ethernet of 10 GbE or more. Specifically, it is possible to measure the bit error rate in units of 100 GbE-PHY using the 2-bit overhead part of the 64b / 66b transmission block code, but monitor the transmission quality in units of FlexE Client (in units of channels). I can't. For example, “7.1 FlexE Group Functions” in 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 of monitoring transmission quality in units of channels.

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

  One embodiment of the present invention provides a transmitting device that transmits a signal input from one or more channels via one or more physical links, and a receiving device that receives the signal from the transmitting device via the physical link. A transmission quality measuring method in which a transmission system including a device measures the quality of transmission over the physical link, wherein the transmitting device transmits the signal by dividing the signal into transmission code block units. A measurement step of measuring the transmission error rate of the signal based on a part of the signal in transmission code block units received from the transmission side device.

  One aspect of the present invention is the above-described transmission quality measurement method, wherein the reception-side device 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 transmission quality measurement method described above, wherein the transmitting device stores and transmits a signal of a predetermined pattern in a payload of a part of transmission code blocks, and the receiving device transmits the transmission signal. 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 device.

  One embodiment of the present invention is the above transmission quality measuring method, wherein the predetermined pattern is a pseudo random pattern.

  One embodiment 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 embodiment of the present invention is the above-described 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 device adds the transmission error rate obtained for each of the transmission code blocks for each of the channels to thereby reduce the transmission error rate for each of the channels. Measure.

  One embodiment of the present invention is the above-described transmission quality measurement method, wherein the 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, the transmission quality is determined for each client signal unit (channel unit) or each client signal constituent unit (Slot unit in FlexE). It becomes possible to monitor.

FIG. 2 is a block diagram showing a specific example of a functional configuration of a transmitting device 1 according to the first embodiment. FIG. 2 is a block diagram showing a specific example of a functional configuration of a control unit 14 according to the first embodiment. 9 is a flowchart illustrating a flow of a process in which the transmission-side apparatus 1 according to the first embodiment inserts overhead into a sub-calendar. FIG. 2 is a block diagram showing a specific example of a functional configuration of a receiving device 2 according to the first embodiment. FIG. 3 is a block diagram showing a specific example of a functional configuration of a bit error rate measurement unit 24 according to the first embodiment. 5 is a flowchart illustrating a flow of a process in which the receiving device 2 measures a BER value in the first embodiment. FIG. 5 is a diagram showing an operation example of BER value measurement in the first embodiment. FIG. 9 is a diagram showing an operation example of BER value measurement in a first modification of the first embodiment. FIG. 11 is a diagram showing an operation example of BER value measurement in a second modification of the first embodiment. FIG. 14 is a diagram showing an operation example of BER value measurement in a third modification of the first embodiment. FIG. 9 is a block diagram showing a specific example of a functional configuration of a transmitting device 1a according to the second embodiment. FIG. 13 is a block diagram showing a specific example of a functional configuration of a control unit 14a according to the second embodiment. FIG. 9 is a diagram illustrating an operation example of BER value measurement according to the second embodiment. FIG. 4 is an image diagram of FlexE when four 100 GbEs are bundled. FIG. 4 is a diagram showing a configuration of a 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 mapping of FlexE Client with Master Calendar.

  Hereinafter, a transmitting device and a receiving device of FlexE capable of monitoring the transmission quality for each client signal unit (channel unit) or each constituent unit of the client signal (Slot unit in FlexE) will be described. Specifically, the transmitting device is a FlexE Shim on the transmitting side in FlexE, and the receiving device is a FlexE Shim on the receiving side.

<First embodiment>
FIG. 1 is a block diagram illustrating a specific example of a functional configuration of the transmitting device 1 according to the first embodiment. The transmitting 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 transmitting device 1 functions as a device including a mapping unit 11, a sub-calendar 12, a 100GbE-PHY 13, and a control unit 14 by executing a program. Note that all or a part of each function of the transmitting apparatus 1 may be realized using hardware such as an ASIC (Application Specific Integrated Circuit), a PLD (Programmable Logic Device), and an FPGA (Field Programmable Gate Array). . 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, and a CD-ROM, and a storage device such as a hard disk built in a computer system. The program may be transmitted via a telecommunication line.

  The mapping unit 11 configures a one-row Master Calendar composed of 64b / 66b transmission code blocks (Slots), and distributes a client signal input from a client device to a plurality of 100 GbE-PHYs (hereinafter, referred to as “PHY”) 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) 2 shows an example of distribution to the Sub-calendar 12. N Sub-calendars 12-1 to 12-N correspond to PHYs 13-1 to 13-N, respectively. In this case, the mapping unit 11 allocates the input k client signals to any 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 one slot every time a client signal is mapped to a predetermined number of slots. The control unit 14 may insert a multi-frame overhead in addition to the overhead of each frame.

  FIG. 2 is a block diagram illustrating a specific example of a functional configuration of the control unit 14 according to 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. Calendar information acquisition section 141 acquires calendar information from mapping section 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 an 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 one slot of overhead each time a client signal is allocated to a predetermined number of slots of each Sab-calendar.

  FIG. 3 is a flowchart illustrating a flow of a process in which the transmitting device 1 according to the first embodiment inserts overhead into a 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 between the frame and the channel identified based on the acquired calendar information.

  The overhead generation unit 142 generates an 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 the functional configuration of the receiving device 2 according to the first embodiment. The receiving device 2 includes a CPU, a memory, an auxiliary storage device, and the like connected by a bus, and executes a program. The receiving 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 each function of the receiving device 2 may be realized using hardware such as an ASIC, a PLD, and an 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, and a CD-ROM, and a storage device such as a hard disk built in a computer system. The program may be transmitted via a telecommunication line.

  The demapping unit 21 has a function of restoring a client signal of each channel from a signal received by the sub-calendar 22 for each PHY 23. Specifically, the demapping unit 21 generates the calendar information based on the 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 of Sub-calendars 22. On the other hand, the demapping unit 21 outputs the generated calendar information to the bit error rate measurement unit 24.

  The bit error rate measuring unit 24 measures a BER (Bit Error Rate) value indicating a rate of occurrence of a transmission error 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 every 20 Slots on the transmitting side to configure a frame. Specifically, the overhead here is a 2-bit overhead in the 64b / 66b transmission block code. Hereinafter, in order to distinguish between them, the overhead inserted for the configuration of the 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 a BER value based on the overhead signal. The bit error rate measurement unit 24 outputs information indicating the measurement result of the BER value measured in this way as measurement information. For example, the bit error rate measurement unit 24 may transmit the measurement information to another device, or may include the display unit if the display unit includes a display unit.

  FIG. 5 is a block diagram illustrating a specific example of a functional configuration of the bit error rate measurement unit 24 according to the first embodiment. For example, the bit error rate measuring unit 24 is provided in the receiving device 2 for each sub-calendar, and each bit error rate measuring unit 24 includes a BER value measuring circuit 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 one of patterns “10” or “01”. The fact that the received overhead signal has any other pattern means that an error has occurred in transmission of the overhead signal. The BER value measurement circuit 241 examines the overhead signal of each slot every time a frame is received, thereby identifying the presence or absence of a transmission error for each slot. The BER value measurement circuit 241 calculates a BER value for each slot based on the inspection result of a predetermined number of frames received continuously. The BER value measurement circuit 241 outputs the thus obtained BER value as measurement information.

  FIG. 6 is a flowchart illustrating a flow of a process of measuring the BER value by the receiving device 2 in the first embodiment. First, a frame is received by each Sub-calendar. The demapping unit 21 identifies the correspondence between each slot and a 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 measurement unit 24 measures a 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 the BER value measurement according to the first embodiment. The operation example of FIG. 7 illustrates a situation in which three frames F11 to F13 are received by one certain Sub-calendar C1. In this case, the receiving device 2 acquires a 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 a BER value that can be used for monitoring transmission quality in FlexE, for example, in Slot units. Accordingly, 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 transmitting device 1 and the receiving device 2 have a plurality of physical links (PHYs) has been described. However, the transmitting device 1 and the receiving device 2 of the first embodiment have one physical link (PHY). A configuration having a physical link may be used.

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

  FIG. 8 is a diagram illustrating an operation example of the BER value measurement in the first modified example of the first embodiment. FIG. 1, Ch. 2 and Ch. 3 shows a situation where three channels F3 to F23 are received in one Sub-calendar C2. In the operation example of FIG. 8, Slots # 1 to # 3 are assigned to channel Ch. 1, Slots # 4 to # 18 are assigned to channel Ch. 2, Slots # 19 and # 20 are connected to channel Ch. 3 respectively. For example, in this case, the reception-side apparatus 2 transmits the sum of the BER values of Slots # 1 to # 3 to the channel Ch. It may be configured to output as a BER value of 1. Similarly, the reception-side apparatus 2 transmits the sum of the BER values of Slots # 4 to # 18 to the channel Ch. 2 and outputs the sum of the BER values of Slots # 19 and # 20 in channel Ch. 3 may be configured to be output as the BER value.

<Second Modification>
In the first embodiment, the configuration has been described in which the bit error rate measurement unit 24 on the receiving side includes the BER value measurement circuit 251 for each slot forming the received frame. However, the bit error rate measurement unit 24 performs the BER measurement for each channel. It may be configured to include a circuit.

  FIG. 9 is a diagram illustrating an operation example of the BER value measurement in the second modified example of the first embodiment. FIG. 9 shows Ch. 1, Ch. 2 and Ch. 3 shows a situation where three channels F3 to F33 are received in one Sub-calendar C3. In the operation example of FIG. 9, the correspondence between each channel and Slot is the same as that of FIG. In this case, the receiving side device 2 sets the channel Ch. The BER value of Slot # 1 to Slot # 3 is calculated by the BER value measurement circuit of No.1. Similarly, channel Ch. 2 are calculated by the BER value measurement circuit of Slot # 4 to Slot # 18, and the channel Ch. The BER values of Slot # 19 and Slot # 20 are calculated by the BER value measurement circuit of No. 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 according to the third modification of the first embodiment. FIG. 10 shows the Ch. 1, Ch. 2 and Ch. This shows a situation in which three channels of three exist, one frame of sub-calendar C4 receives three frames F41 to F43, and one frame of sub-calendar C5 receives three frames F51 to F53. Further, in the operation example of FIG. 10, the correspondence between each channel and 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 assigned to channel Ch. 3 respectively.

  In this case, the receiving side device 2 sets the channel Ch. The BER value for the Slot # 1 to Slot # 3 of the Sub-calendar C4 is calculated by the BER value measurement circuit of No. 1. On the other hand, channel Ch. In the BER value measurement circuit of Sub-calendar C4, the BER values of Slot # 4 to Slot # 18 of Sub-calendar C4 and Slot # 1 to Slot # 1 of Sub-calendar C5 are calculated, and channel Ch. The BER value measurement circuit of No. 3 calculates the BER values of Slot # 19 and Slot # 4 of Sub-calendar C4 and Slot # 4 to # 20 of Sub-calendar C5. 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 device 1a according to the second embodiment. The transmitting device 1a according to the second embodiment is different from the transmitting device 1 according to 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 stores a signal for measuring a bit error (hereinafter referred to as a "measurement signal") in a specific slot specified by the control unit 14a in addition to the client signal, in addition to the client signal. Different from part 11. The measurement signal may be a fixed pattern signal or a non-fixed pattern signal. As an example of the signal of the non-fixed pattern, a signal having a pseudo random pattern in which the same random signal appears in a constant cycle may be used.

  The control unit 14a specifies a slot for storing the measurement signal for the mapping unit 11a, in addition to controlling the frame by inserting the overhead. The slot specified here may be a predetermined specific slot or may be 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 according to the second embodiment. The control unit 14a differs 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 an overhead to be inserted into the OHB of each sub-calendar, and specifies a slot for storing a measurement signal for the mapping unit 11a. The overhead generation unit 142a stores the slot information designated for the mapping unit 11a in a predetermined area of the generated overhead, thereby notifying the reception device 2 of the slot in which the measurement signal is stored. Is also good.

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

  According to the transmission-side apparatus 1a and the reception-side apparatus 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 reception-side apparatus 2 can more accurately detect a transmission error having a pattern dependency and acquire a more accurate BER value. It becomes possible.

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

  The transmitting device or the receiving device in the above-described embodiment may be realized by 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 and executed by a computer system. Here, the “computer system” includes an OS and hardware such as peripheral devices. The “computer-readable recording medium” refers to a portable medium such as a flexible disk, a magneto-optical disk, a ROM, and a CD-ROM, and a storage device such as a hard disk built in a computer system. Further, a "computer-readable recording medium" refers to a communication line for transmitting a program via a network such as the Internet or a communication line such as a telephone line, and dynamically holds the program for a short time. Such a program may include a program that holds a program for a certain period of time, such as a volatile memory in a computer system serving as a server or a client in that case. The program may be for realizing a part of the functions described above, or may be a program that can realize the functions described above in combination with a program already recorded in a computer system. It may be realized using a programmable logic device such as an FPGA (Field Programmable Gate Array).

  As described above, the embodiments of the present invention have been described in detail with reference to the drawings. However, the specific configuration is not limited to the embodiments and includes a design and the like within a range not departing from the gist of the present invention.

  The present invention provides a transmitting device that transmits a client signal input from one or more channels via one or more physical links, and a receiving device that receives a client signal from the transmitting device via the physical link. The present invention can be applied to a transmission system provided.

1, 1a: transmitting side device, 2, 2a: receiving side device, 11, 11a: mapping unit, 12: sub-calendar, 13: 100GbE-PHY, 14, 14a: control unit, 141: calendar information acquisition unit, 142 , 142a: Overhead generation unit, 143: Overhead output unit, 21: Demapping unit, 22: Sub-calendar, 23: 100 GbE-PHY, 24: Bit error rate measurement unit, 241: BER value measurement circuit

Claims (7)

A transmission device comprising: a transmission device that transmits a client signal input from one or more channels via one or more physical links; and a reception device that receives the client signal from the transmission device via the physical link. A transmission quality measurement method in which a system measures the quality of transmission over the physical link,
A transmitting step of transmitting the client signal by dividing the client signal into transmission code block units,
The receiving-side device, based on a part of the signal of the transmission code block unit received from the transmitting-side device, a measurement step of measuring the transmission error rate for each of the client signal units or the constituent units of the client signal,
Has,
Wherein the receiving device outputs a sum of bit error rates for all slots included in each channel,
Transmission quality measurement method.
The receiving-side device measures the transmission error rate based on an overhead signal given to each of the transmission code blocks,
The transmission quality measurement method according to claim 1.
The transmitting side device stores a signal of a predetermined pattern in a payload of some transmission code blocks and transmits the signal,
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 measurement method according to claim 1.
The predetermined pattern is a pseudo random pattern,
The transmission quality measuring method according to claim 3.
The transmission code block is a 64b / 66b transmission code block including a 2-bit overhead and a 64-bit payload.
The transmission quality measuring method according to claim 1.
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 measurement method according to claim 5.
Signals input from the one or more channels are distributed and transmitted over one or more physical links,
Transmission quality measuring method according to any one of claims 1 to 6.

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