JP2014013967A - Communication monitoring device and communication monitoring method - Google Patents

Abstract

In a communication system in which one or a plurality of home-side devices transmit a communication signal to a station-side device via a common communication line, and the communication signals from each home-side device to the station-side device are time-division multiplexed. Then, the power of the upstream optical signal is measured for each home device.
A communication monitoring apparatus includes a grasping unit for grasping a home-side apparatus connected to the communication line based on a communication signal received via the communication line, and a grasped home-side apparatus. Measurement target determination unit 13 for determining a target device that is a home device 202 to be measured, and a communication signal received via a communication line after the home device 202 to be measured is determined Then, based on the identification result by the transmission source identification unit 12 and the transmission source identification unit 12 for identifying the home side device 202 that is the transmission source of the communication signal, the power measurement result of the communication signal from the target device is measured. A power information acquisition unit 13 for acquiring from the unit 11.
[Selection] Figure 4

Description

  The present invention relates to a communication monitoring device and a communication monitoring method, and more particularly to a communication monitoring device and a communication monitoring method for monitoring a communication signal transmitted from a home side device to a station side device.

  In recent years, the Internet has become widespread, and users can access various information on sites operated in various parts of the world and obtain the information. Along with this, devices capable of broadband access such as ADSL (Asymmetric Digital Subscriber Line) and FTTH (Fiber To The Home) are rapidly spreading.

  In IEEE Std 802.3ah (registered trademark) -2004 (non-patent document 1), a plurality of home side devices (ONU: Optical Network Unit) share an optical communication line, and a station side device (OLT: Optical Line Terminal). One method of a passive optical network (PON), which is a medium-sharing communication that performs data transmission with the network, is disclosed. That is, EPON (Ethernet (registered trademark) PON) in which all information is communicated in the form of an Ethernet (registered trademark) frame, including user information passing through the PON and control information for managing and operating the PON, and EPON An access control protocol (MPCP (Multi-Point Control Protocol)) and an OAM (Operations Administration and Maintenance) protocol are defined. By exchanging MPCP frames between the station side device and the home side device, the home side device joins and leaves, and uplink access multiplexing control is performed. Non-Patent Document 1 describes a registration method for a new home device, a report indicating a bandwidth allocation request, and a gate indicating a transmission instruction using an MPCP message.

  As a next-generation technology of GE-PON, which is an EPON that realizes a communication speed of 1 gigabit / second, 10G-EPON standardized as IEEE 802.3av (registered trademark) -2009, that is, a communication speed of 10 gigabit / Even in EPON equivalent to seconds, the access control protocol is predicated on MPCP.

  As an example of a configuration for monitoring a communication state in a PON system, for example, JP 2010-258895 A (Patent Document 1) discloses the following communication monitoring device. That is, the communication monitoring device includes an optical signal receiving unit that receives an upstream optical signal from the ONU to the OLT via an optical coupler on the optical fiber transmission line, and a MAC in the received signal from the received signal received by the optical signal receiving unit. (Medium Access Control) Based on the difference in the preamble in the frame, the signal type identifying means for automatically discriminating whether the communication is based on the MC (Media Converter) system or the PON system, and the signal type identifying means Communication monitoring means for monitoring the communication state in the MC system or the communication state in the PON system according to the signal type.

IEEE Std 802.3ah (registered trademark) -2004

JP 2010-258895 A

  As a method for detecting disconnection of an optical fiber in the PON system, for example, a method of performing an optical pulse test (OTDR: Optical Time-Domain Reflectometer) as described in Patent Document 1 is conceivable.

  However, in order to detect an optical fiber abnormality for each ONU, such an optical pulse test is insufficient. For example, it is necessary to measure the power of the upstream optical signal, that is, the intensity for each ONU.

  Here, in the PON system, the downstream optical signal is a continuous signal, and since one station side device is provided, the power of the downstream optical signal can be measured using a general optical power meter.

  On the other hand, in the PON system, there are a plurality of home-side devices, and since the optical signals from each ONU to the station-side device are time-division multiplexed, the upstream optical signal is a burst signal, and the power of the upstream optical signal is set to ONU. It is difficult to measure every one.

  The present invention has been made in order to solve the above-described problems, and an object of the present invention is to transmit a communication signal to a station-side device via a common communication line by one or more home-side devices, and each home-side device Another object of the present invention is to provide a communication monitoring device and a communication monitoring method capable of measuring the power of an upstream optical signal for each home-side device in a communication system in which the communication signal from a station to a station-side device is time division multiplexed.

  In order to solve the above problems, a communication monitoring apparatus according to an aspect of the present invention is such that one or a plurality of home-side devices transmit a communication signal to a station-side device via a common communication line, and each of the home-side devices A communication monitoring device used in a communication system in which the communication signal from the station to the station side device is time-division multiplexed, and connected to the communication line based on the communication signal received via the communication line A grasping unit for grasping the home-side device; a measurement target determining unit for determining a target device that is a home-side device to be measured from the home-side devices grasped by the grasping unit; A source for identifying the home side device that is the source of the communication signal based on the communication signal received via the communication line after the home side device to be measured is determined by the measurement target determining unit Specific part A power measurement unit for measuring the power of the communication signal received via the communication line, and a power measurement result of the communication signal from the target device based on a specification result by the transmission source specifying unit. A power information acquisition unit for acquiring from the power measurement unit.

  With such a configuration, in the communication system, the power of the communication signal, which is a burst signal, can be measured for each home-side device, so that an abnormality in the communication line can be detected for each home-side device, for example. More specifically, the communication signal power value can be measured for each home-side device. For example, when a communication line switching work is performed between the station-side device and each home-side device, before the switching work. From the comparison between the power value of each home device and the power value of each home device after the switching work, the normality of the work can be appropriately determined. In addition, it is possible to accurately find inconveniences such as slight power reductions due to communication line connector fitting and dust adhesion for each home-side device. Also, without using the communication signal from the station side device to the home side device, the home side device connected to the communication line is grasped based on the communication signal from the home side device to the station side device, and the home to be measured is measured. It is possible to determine the side device, specify the home device that is the transmission source of the communication signal, and obtain the power value of the home device to be measured, thereby simplifying the configuration and processing of the communication monitoring device Can do.

  Preferably, the communication monitoring device further measures the communication signal based on the communication signal received through the communication line after the measurement target determining unit determines the measurement target home device. A timing setting unit for setting a power timing, and the power measurement unit measures the power of the communication signal according to the timing set by the timing setting unit.

  In this way, the home-side device connected to the communication line is grasped, the home-side device to be measured is determined, and the measurement timing is set based on the communication signal received thereafter, such as 10G-EPON. Even when the upstream optical signal is high-speed, the power value can be measured quickly.

  More preferably, the power information acquisition unit sets a timing for measuring the communication signal in the timing setting unit when the transmission source of the communication signal specified by the transmission source specifying unit is the target device. Then, the power measured by the power measuring unit according to the timing is acquired as the power measurement result of the communication signal from the target device.

  In this way, the home-side device connected to the communication line is grasped, the home-side device to be measured is determined, and the measurement timing is set based on the communication signal received thereafter, such as 10G-EPON. Even when the upstream optical signal is high-speed, the power value can be measured quickly.

  More preferably, the timing setting unit sets a timing at which the communication signal is to be measured every time the communication signal is received via the communication line, and the power information acquisition unit is configured to perform the power measurement by the power measurement unit. Among the measurement results, the measurement result of the communication signal specified as the transmission source by the transmission source specifying unit is acquired as the power measurement result of the communication signal from the target device.

  As described above, the configuration in which the power of the communication signal is measured before the transmission source of the communication signal is specified increases the degree of freedom in selecting the measurement range of the communication signal that is a burst signal, and more appropriate power measurement can be performed. .

  Preferably, the communication monitoring device further includes a presentation unit for presenting the measurement result acquired by the power information acquisition unit for each of the home-side devices based on a specification result by the transmission source specification unit. .

  With such a configuration, for example, a person in charge of communication system construction can visually recognize the power value of the communication signal for each home device.

  In order to solve the above problems, a communication monitoring method according to an aspect of the present invention is such that one or a plurality of home-side devices transmit a communication signal to a station-side device via a common communication line, and each of the home-side devices A communication monitoring method in a communication system in which the communication signal from the mobile station to the station-side device is time-division multiplexed, the home connected to the communication line based on the communication signal received via the communication line A step of grasping a side device, a step of determining a target device that is a home device to be measured from among the grasped home devices, and a step of determining the home device to be measured via the communication line Based on the received communication signal, the step of identifying the home device as the transmission source of the communication signal and the power measurement result of the communication signal from the target device based on the identification result of the transmission source Tokusuru and a step.

  With such a configuration, in the communication system, the power of the communication signal, which is a burst signal, can be measured for each home-side device, so that an abnormality in the communication line can be detected for each home-side device, for example. More specifically, the communication signal power value can be measured for each home-side device. For example, when a communication line switching work is performed between the station-side device and each home-side device, before the switching work. From the comparison between the power value of each home device and the power value of each home device after the switching work, the normality of the work can be appropriately determined. In addition, it is possible to accurately find inconveniences such as slight power reductions due to communication line connector fitting and dust adhesion for each home-side device. Also, without using the communication signal from the station side device to the home side device, the home side device connected to the communication line is grasped based on the communication signal from the home side device to the station side device, and the home to be measured is measured. It is possible to determine the side device, specify the home device that is the transmission source of the communication signal, and obtain the power value of the home device to be measured, thereby simplifying the configuration and processing of the communication monitoring device Can do.

  According to the present invention, one or a plurality of home-side devices transmit a communication signal to the station-side device via a common communication line, and the communication signal from each home-side device to the station-side device is time-division multiplexed. In the communication system, the power of the upstream optical signal can be measured for each home device.

It is a figure which shows the structure of the PON system which concerns on embodiment of this invention. It is a figure which shows the structure of the station side apparatus in the PON system which concerns on embodiment of this invention. It is a figure which shows the structure of the home side apparatus which concerns on embodiment of this invention. It is a figure which shows the structure of the communication monitoring apparatus which concerns on embodiment of this invention. It is a flowchart which shows the operation | movement procedure at the time of the communication monitoring apparatus which concerns on embodiment of this invention measures optical power for every ONU. It is a figure which shows the exchange of the information between each unit at the time of the communication monitoring apparatus which concerns on embodiment of this invention measures optical power for every ONU. It is a time chart which shows the signal and operation | movement content at the time of the communication monitoring apparatus which concerns on embodiment of this invention measuring optical power for every ONU. It is a figure which shows an example of the display content of the optical power by the communication monitoring apparatus which concerns on embodiment of this invention. It is a flowchart which shows the operation | movement procedure at the time of the communication monitoring apparatus which concerns on embodiment of this invention measures optical power for every ONU. It is a figure which shows the exchange of the information between each unit at the time of the communication monitoring apparatus which concerns on embodiment of this invention measures optical power for every ONU. It is a time chart of the signal and operation | movement when the communication monitoring apparatus which concerns on embodiment of this invention measures optical power for every ONU.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals and description thereof will not be repeated.

[Configuration and basic operation]
FIG. 1 is a diagram showing a configuration of a PON system according to an embodiment of the present invention.

  With reference to FIG. 1, the PON system 401 includes a station side device 101, ONUs 202 </ b> A, 202 </ b> B, 202 </ b> C, a splitter SP, and a communication monitoring device 301. The ONUs 202A, 202B, 202C and the station side apparatus 101 are connected via the splitter SP and the optical fiber OPTF, and transmit / receive optical signals to / from each other. In the PON system 401, optical signals from the ONUs 202A, 202B, and 202C to the station apparatus 101 are time-division multiplexed.

  Hereinafter, the direction from the ONU to the upper network is referred to as an upstream direction, and the direction from the upper network to the ONU is referred to as a downstream direction. Each of the ONUs 202A, 202B, and 202C may be referred to as an ONU 202.

  The communication monitoring device 301 is connected to the optical fiber OPTF via a coupler, for example, and monitors the state of each ONU 202 by analyzing the upstream optical signal from each ONU 202.

  FIG. 2 is a diagram showing a configuration of a station side device in the PON system according to the embodiment of the present invention.

  Referring to FIG. 2, station apparatus 101 stores an uplink IF (Interface) unit 31, a reception processing unit 33, a transmission processing unit 34, a PON transmission / reception unit 35, a control unit 36, and an uplink frame. And a FIFO 38 for accumulating downstream frames.

  The PON transmission / reception unit 35 transmits / receives optical signals to / from each ONU 202 via a common PON line. That is, the PON transmission / reception unit 35 is connected to the optical fiber OPTF, which is a PON line, as a master station side starting point of the PON line. The PON transmission / reception unit 35 receives an upstream optical signal of a specific wavelength, for example, a 1310 nm band, and converts it into an electrical signal so that bidirectional communication can be performed with each ONU 202 via the optical fiber OPTF. In addition to outputting, the electrical signal received from the transmission processing unit 34 is converted into a downstream optical signal of another wavelength and transmitted. For example, the PON transmission / reception unit 35 converts a 10 Gbps (gigabit / second) electrical signal received from the transmission processing unit 34 into a downstream optical signal in the 1570 nm band, transmits the signal to each ONU 202, and receives from the transmission processing unit 34. An electrical signal of 1 Gbps (gigabit / second) is converted into a downstream optical signal in the 1490 nm band and transmitted to each ONU 202.

  The reception processing unit 33 reconstructs a frame from the electrical signal received from the PON transmission / reception unit 35 and distributes the frame to the control unit 36 or the FIFO 37 according to the type of the frame. Specifically, the data frame is output to the FIFO 37 and the control frame is output to the control unit 36.

  The uplink IF unit 31 outputs the uplink frame stored in the FIFO 37 to the upper network. Further, when receiving a frame from the upper network, the uplink IF unit 31 outputs the frame to the FIFO 38 when the frame is a normal data frame, and outputs the frame to the control unit 36 when the frame is a control frame. .

  When receiving the control frame from the control unit 36, the uplink IF unit 31 outputs the control frame to the upper network in preference to the frame from the FIFO 37 in the interval between the frame sequences from the FIFO 37, for example.

  When the FIFO 38 or the control unit 36 has a frame to be transmitted, the transmission processing unit 34 receives the frame according to the priority order and outputs it to the PON transmission / reception unit 35.

  The control unit 36 performs station-side processing relating to control and management of the PON line such as MPCP and OAM. That is, by exchanging an MPCP message and an OAM message with each ONU 202 connected to the PON line, the ONU 202 registration, withdrawal and upstream access control including the bandwidth allocation, the downlink access control, and the sleep instruction to the ONU 202 are included. The operation management of the ONU 202 is performed.

  For example, the control unit 36 allocates the upstream bandwidth in the PON line to each ONU 202 based on the upstream bandwidth allocation request in the PON line received from each ONU 202. Specifically, the control unit 36 allocates the bandwidth in the PON line to the ONU 202 based on the report frame indicating the bandwidth allocation request in the PON line received from the ONU 202, that is, transmits a gate frame describing the grant to the ONU 202. .

  The control unit 36 allocates an upstream band in the PON line to each ONU 202 so that the arrival timing of the upstream frame from each ONU 202 does not overlap in time in the station apparatus 101. The control unit 36 notifies the ONU 202 of the transmission start timing of the uplink frame and the transmittable data length using the gate frame.

  Further, for example, the control unit 36 assigns an allocation period including an uplink bandwidth allocation request reception period on the PON line from each ONU 202 and a scheduled uplink frame reception period from each ONU 202, that is, DBA (Dynamic Bandwidth Allocation). Cycle). Here, for example, the controller 36 calculates the bandwidth allocation amount in the scheduled uplink frame reception period from each ONU 202.

  FIG. 3 is a diagram showing the configuration of the home-side apparatus according to the embodiment of the present invention.

  Referring to FIG. 3, the ONU 202 includes a PON port 21, an optical reception processing unit 22, a buffer memory 23, a transmission processing unit 24, a UNI (User Network Interface) port 25, a reception processing unit 26, and a buffer. A memory 27, an optical transmission processing unit 28, and a control unit 29 are provided.

  The optical reception processing unit 22 receives the downstream optical signal transmitted from the station side device 101 via the PON port 21, converts it into an electrical signal, reconstructs the frame from the electrical signal, and according to the type of the frame The frame is distributed to the control unit 29 or the transmission processing unit 24 via the buffer memory 23. Specifically, the optical reception processing unit 22 outputs a data frame to the transmission processing unit 24 and outputs a control frame to the control unit 29.

  The transmission processing unit 24 transmits the data frame received from the optical reception processing unit 22 to a user terminal such as a personal computer (not shown) via the UNI port 25.

  The reception processing unit 26 outputs the data frame received from the user terminal via the UNI port 25 to the optical transmission processing unit 28 via the buffer memory 27.

  The control unit 29 performs home-side processing related to control and management of the PON line such as MPCP and OAM. That is, various controls such as access control are performed by exchanging MPCP messages and OAM messages with the station side apparatus 101 connected to the PON line. The control unit 29 generates a control frame including various control information and outputs it to the optical transmission processing unit 28 via the buffer memory 27.

  The optical transmission processing unit 28 converts the data frame received from the reception processing unit 26 and the control frame received from the control unit 29 into an optical signal, and transmits the optical signal to the station apparatus 101 via the PON port 21.

  FIG. 4 is a diagram showing the configuration of the communication monitoring apparatus according to the embodiment of the present invention.

  Referring to FIG. 4, the communication monitoring apparatus 301 includes an optical transceiver (power measurement unit) 11, a PON signal processing unit (grasping unit and transmission source specifying unit) 12, and an optical power measurement control unit (measurement target determination unit and A power information acquisition unit 13, a timing signal generation unit (timing setting unit) 14, a storage unit 15, and a display control unit (presentation unit) 16 are provided.

  The optical transceiver 11 has a function of transmitting and receiving an optical signal, receives an upstream optical signal from the optical fiber OPTF that is a PON line, converts it into an electrical signal, and outputs the electrical signal to the PON signal processing unit 12 as a PON reception signal. Instead of the optical transceiver 11, an optical module having a burst optical signal reception function may be used.

  The optical power measurement control unit 13 performs power measurement control of the upstream optical signal from the ONU 202 by controlling each unit in the communication monitoring apparatus 301.

  The timing signal generation unit 14 generates a timing signal indicating the timing at which the upstream optical signal should be measured, and outputs the timing signal to the optical transceiver 11. For example, the timing signal generation unit 14 sets the measurement start timing after a predetermined time has elapsed from the start timing of the upstream frame. Thereby, it is possible to more accurately measure the power of the upstream optical signal while avoiding the head portion of the upstream frame with unstable power.

  The optical transceiver 11 measures the power of the upstream optical signal received via the PON line. More specifically, the optical transceiver 11 performs power measurement and power value calculation of the upstream optical signal according to the timing indicated by the timing signal received from the timing signal generation unit 14.

  The storage unit 15 stores a management table for managing the state of each ONU 202. This management table is created and updated by the PON signal processing unit 12 and the optical power measurement control unit 13.

[Operation]
Next, the operation when the communication monitoring apparatus according to the embodiment of the present invention measures optical power for each ONU will be described.

  The PON signal processing unit 12 grasps the ONU 202 connected to the PON line based on the upstream optical signal received via the PON line, that is, the upstream optical signal received by the optical transceiver 11.

  For example, the PON signal processing unit 12 extracts the identifier given to the ONU 202 by the station side device 101 from the upstream optical signal received via the PON line, and determines the ONU 202 connected to the PON line based on the extracted identifier. To grasp.

  More specifically, the PON signal processing unit 12 analyzes the uplink frame included in the PON reception signal received from the optical transceiver 11 and, for example, determines the uplink frame from the logical link identifier (LLID) or MAC address in the header of the uplink frame. The ONU 202 of the transmission source is identified. Further, the PON signal processing unit 12 determines what service communication is performed using the ONU 202 from the priority in the header of the uplink frame. Then, the PON signal processing unit 12 creates a management table indicating these analysis results and stores them in the storage unit 15.

  Here, LLID is an identifier of a logical path in the PON line, which is given to the ONU 202 by the station side device 201.

  The optical power measurement control unit 13 refers to the management table stored in the storage unit 15 and determines the target ONU that is the ONU 202 to be measured from the ONUs 202 grasped by the PON signal processing unit 12. For example, the optical power measurement control unit 13 sequentially determines all ONUs 202 grasped by the PON signal processing unit 12 as ONUs 202 to be measured.

  The PON signal processing unit 12 specifies the ONU 202 that is the transmission source of the upstream optical signal based on the upstream optical signal received via the PON line after the optical power measurement control unit 13 determines the ONU 202 to be measured. For example, the PON signal processing unit 12 extracts the LLID, which is an identifier assigned to the ONU 202 by the station side device 101, from the upstream optical signal received via the PON line, and based on the extracted identifier, The source ONU 202 is specified.

  The optical power measurement control unit 13 acquires the power measurement result of the upstream optical signal from the target ONU from the optical transceiver 11 based on the specific result by the PON signal processing unit 12.

  The display control unit 16 presents the measurement result acquired by the optical power measurement control unit 13 for each ONU 202 based on the specific result by the PON signal processing unit 12. More specifically, the display control unit 16 reads the management table from the storage unit 15 and performs control to display the contents of the management table on a display unit such as a personal computer (not shown).

  FIG. 5 is a flowchart showing an operation procedure when the communication monitoring apparatus according to the embodiment of the present invention measures the optical power for each ONU. FIG. 6 is a diagram illustrating information exchange between units when the communication monitoring apparatus according to the embodiment of the present invention measures optical power for each ONU. FIG. 7 is a time chart showing signals and operation contents when the communication monitoring apparatus according to the embodiment of the present invention measures optical power for each ONU. FIG. 7 shows how the optical power of ONU # 1 is measured.

  For example, the timing signal generation unit 14 sets the timing for measuring the upstream optical signal based on the upstream optical signal received via the PON line after the ONU 202 to be measured is determined by the optical power measurement control unit 13. To do.

  Then, the optical transceiver 11 measures the power of the upstream optical signal according to the timing set by the timing signal generator 14.

  More specifically, when the transmission source of the upstream optical signal specified by the PON signal processing unit 12 is the target ONU, the optical power measurement control unit 13 sends the timing signal generation unit 14 via the PON signal processing unit 12 to the timing signal generation unit 14. The timing for measuring the upstream optical signal is set, and the power measured by the optical transceiver 11 according to the timing is acquired as the power measurement result of the upstream optical signal from the target ONU.

  Specifically, referring to FIG. 5 to FIG. 7, first, the PON signal processing unit 12 analyzes the upstream optical signal, specifically analyzes the PON reception signal received from the optical transceiver 11, A management table is created (step S1).

  Next, the optical power measurement control unit 13 reads the management table from the storage unit 15 and determines the target ONU that is the measurement target ONU 202 from the ONUs 202 indicated by the management table. Then, the optical power measurement control unit 13 notifies the PON signal processing unit 12 of the LLID of the target ONU (step S2).

  Next, the optical transceiver 11 receives the upstream optical signal from the PON line, converts it into an electrical signal, and outputs it as a PON reception signal to the PON signal processing unit 12 (step S3).

  Next, the PON signal processing unit 12 analyzes the PON reception signal received from the optical transceiver 11 to identify the ONU 202 that is the transmission source of the upstream optical signal (step S4).

  Next, when the LLID of the identified ONU 202 matches the LLID of the target ONU notified from the optical power measurement control unit 13, the PON signal processing unit 12 indicates that the upstream optical signal of the target ONU has been received. The timing signal generator 14 is notified. The timing signal generation unit 14 receives the notification from the PON signal processing unit 12 and outputs a timing signal indicating the timing at which the upstream optical signal should be measured to the optical transceiver 11 (step S5).

  Next, the optical transceiver 11 measures the power of the upstream optical signal at the timing indicated by the timing signal received from the timing signal generation unit 14, and calculates the power value (step S6).

  Next, the optical power measurement control unit 13 reads the power value of the upstream optical signal from the optical transceiver 11 at the timing when the power measurement and power value calculation by the optical transceiver 11 are completed. Here, the optical power measurement control unit 13 is preset with the time required for power measurement and power value calculation by the optical transceiver 11, and the optical power measurement control unit 13 receives the timing signal from the timing signal generation unit 14 as an optical signal. The power value is read after the required time has elapsed since it was output to the transceiver 11 (step S7).

  Next, the optical power measurement control unit 13 adds the power value read from the optical transceiver 11 to the management table in the storage unit 15 as the power value of the upstream optical signal from the target ONU. For example, the optical power measurement control unit 13 performs the selection of the ONU 202 to be measured and the acquisition of the power value of the upstream optical signal from the ONU 202 to be measured for all the ONUs 202 described in the management table. Are added to the management table (step S8).

  Next, the display control unit 16 performs control to display the power value indicated by the management table in the storage unit 15 for each ONU 202 (step S9).

  FIG. 8 is a diagram showing an example of display contents of optical power by the communication monitoring apparatus according to the embodiment of the present invention.

  With reference to FIG. 8, the display control unit 16 displays the correspondence relationship between the MAC address of the ONU 202, the optical power, the link state, and the communication state at each priority level.

  In this example, for the ONU 202 with the MAC address “Aa: aa: aa: aa: aa: aa”, the power value of the upstream optical signal is −20 dBm, the link with the station apparatus 101 is established, and priority is given. 0 degree service communication is performed. Further, for the ONU 202 with the MAC address “Bb: bb: bb: bb: bb: bb”, the power value of the upstream optical signal is −19 dBm, the link with the station side apparatus 101 is established, and various services are There is no communication. Further, for the ONU 202 with the MAC address “Cc: cc: cc: cc: cc: cc”, the power value of the upstream optical signal is −22 dBm, and the link with the station side apparatus 101 has been established. There is no communication.

  In addition, the power measurement result acquisition method is not limited to the method described above, and the power measurement result may be acquired as follows. That is, the timing signal generation unit 14 sets the timing at which the upstream optical signal is to be measured every time the upstream optical signal is received via the PON line. Then, the optical power measurement control unit 13 uses the upstream optical signal from the target ONU as the measurement result of the upstream optical signal identified by the PON signal processing unit 12 as being the target ONU among the measurement results by the optical transceiver 11. Obtained as a signal power measurement result.

  FIG. 9 is a flowchart showing an operation procedure when the communication monitoring apparatus according to the embodiment of the present invention measures the optical power for each ONU. FIG. 10 is a diagram illustrating information exchange between units when the communication monitoring apparatus according to the embodiment of the present invention measures optical power for each ONU. FIG. 11 is a time chart of signals and operations when the communication monitoring apparatus according to the embodiment of the present invention measures optical power for each ONU. FIG. 11 shows how the optical power of ONU # 1 is measured.

  9 to 11, first, the PON signal processing unit 12 analyzes the upstream optical signal, specifically analyzes the PON reception signal received from the optical transceiver 11, and creates a management table. (Step S11).

  Next, the optical power measurement control unit 13 reads the management table from the storage unit 15 and determines the target ONU that is the measurement target ONU 202 from the ONUs 202 indicated by the management table. Then, the optical power measurement control unit 13 gives an optical power measurement start instruction to the timing signal generation unit 14 (step S12).

  Next, the optical transceiver 11 receives the upstream optical signal from the PON line, converts it into an electrical signal, and outputs it to the PON signal processing unit 12 as a PON reception signal. Then, when the PON reception signal received from the optical transceiver 11 includes an upstream frame, the PON signal processing unit 12 notifies the timing signal generation unit 14 that the upstream frame has been received (step S13).

  Next, the timing signal generation unit 14 receives the notification from the PON signal processing unit 12 and outputs a timing signal indicating the timing at which the upstream optical signal should be measured to the optical transceiver 11. More specifically, the timing signal generation unit 14 outputs the timing signal after a predetermined time has elapsed from the leading timing of the upstream frame (step S14).

  Next, the optical transceiver 11 measures the power of the upstream optical signal at the timing indicated by the timing signal received from the timing signal generation unit 14, and calculates the power value (step S15).

  In parallel with the power measurement and power value calculation by the optical transceiver 11, the PON signal processing unit 12 analyzes the PON reception signal received from the optical transceiver 11 to identify the ONU 202 that is the transmission source of the upstream optical signal. The LLID of the identified ONU 202 is notified to the optical power measurement control unit 13 (step S16).

  Next, when the LLID of the target ONU does not match the LLID of the ONU 202 notified from the PON signal processing unit 12 (NO in step S17), the optical power measurement control unit 13 obtains a power value from the optical transceiver 11. Without reading, the PON signal processing unit 12 waits until a new LLID of the ONU 202 is notified.

  On the other hand, when the LLID of the target ONU matches the LLID of the ONU 202 notified from the PON signal processing unit 12 (YES in step S17), the optical power measurement control unit 13 performs power measurement and power by the optical transceiver 11. The power value of the upstream optical signal is read from the optical transceiver 11 at the timing when the value calculation is completed. Here, a time required for power measurement and power value calculation by the optical transceiver 11 is preset in the optical power measurement control unit 13, and the optical power measurement control unit 13 receives the latest timing signal from the timing signal generation unit 14. Is output to the optical transceiver 11 and the power value is read after a lapse of the required time (step S18).

  Next, the optical power measurement control unit 13 adds the power value read from the optical transceiver 11 to the management table in the storage unit 15 as the power value of the upstream optical signal from the target ONU. For example, the optical power measurement control unit 13 performs the selection of the ONU 202 to be measured and the acquisition of the power value of the upstream optical signal from the ONU 202 to be measured for all the ONUs 202 described in the management table. Are added to the management table (step S19).

  Next, the display control unit 16 performs control to display the power value indicated by the management table in the storage unit 15 for each ONU 202 (step S20).

  The optical power measurement control unit 13 may acquire the power measurement results of the upstream optical signal transmitted from the target ONU a plurality of times, and calculate the average of the acquired measurement results.

  Specifically, the optical power measurement control unit 13 performs power measurement for the same ONU 202 a plurality of times, and adds a value obtained by averaging the power values read from the optical transceiver 11 to the management table.

  By the way, in order to detect an optical fiber abnormality for each ONU, the optical pulse test described in Patent Document 1 is insufficient, and for example, it is necessary to measure the power of the upstream optical signal, that is, the intensity for each ONU. There is. However, in the PON system, there are a plurality of home-side devices, and the optical signal from each ONU to the station-side device is time-division multiplexed, so the upstream optical signal is a burst signal, and the power of the upstream optical signal is It is difficult to measure every one.

  On the other hand, in the communication monitoring apparatus according to the embodiment of the present invention, the PON signal processing unit 12 grasps the ONU 202 connected to the PON line based on the upstream optical signal received via the PON line. The optical power measurement control unit 13 determines the target ONU that is the ONU 202 to be measured from the ONUs 202 grasped by the PON signal processing unit 12. The PON signal processing unit 12 specifies the ONU 202 that is the transmission source of the upstream optical signal based on the upstream optical signal received via the PON line after the optical power measurement control unit 13 determines the ONU 202 to be measured. The optical transceiver 11 measures the power of the upstream optical signal received via the PON line. Then, the optical power measurement control unit 13 acquires the power measurement result of the upstream optical signal from the target ONU from the optical transceiver 11 based on the specified result by the PON signal processing unit 12.

  With such a configuration, in the PON system, the power of the upstream optical signal, which is a burst signal, can be measured for each ONU. For example, an optical fiber abnormality can be detected for each ONU.

  More specifically, the optical signal power value can be measured for each ONU 202. For example, when an optical fiber switching work is performed between the station apparatus 101 and each ONU 202, the ONU 202 before the switching work is switched. From the comparison between the power value and the power value of each ONU 202 after the switching work, it is possible to appropriately determine the normality of the work. In addition, problems such as a slight power drop due to optical fiber connector fitting and dust adhesion can be accurately detected for each ONU 202.

  Further, without using the downstream optical signal from the station side device 101, the ONU 202 connected to the PON line is grasped based on the upstream optical signal, the ONU 202 to be measured is determined, and the ONU 202 that is the transmission source of the upstream optical signal is determined. Thus, the power value of the ONU 202 to be measured can be acquired, and the configuration and processing of the communication monitoring device can be simplified.

  Further, in the communication monitoring apparatus according to the embodiment of the present invention, the timing signal generation unit 14 is based on the upstream optical signal received via the PON line after the optical power measurement control unit 13 determines the ONU 202 to be measured. Thus, the timing for measuring the upstream optical signal is set. Then, the optical transceiver 11 measures the power of the upstream optical signal according to the timing set by the timing signal generator 14.

  In this way, the ONU 202 connected to the PON line is grasped, the ONU 202 to be measured is determined, and the measurement timing is set based on the upstream optical signal received thereafter, for example, the upstream optical signal such as 10G-EPON. Even when the signal is high-speed, the power value can be measured quickly.

  Further, in the communication monitoring apparatus according to the embodiment of the present invention, the optical power measurement control unit 13 is configured such that when the upstream optical signal transmission source specified by the PON signal processing unit 12 is the target ONU, the PON signal processing unit. 12, the timing signal generation unit 14 sets the timing at which the upstream optical signal is to be measured, and the power measured by the optical transceiver 11 according to the timing is acquired as the power measurement result of the upstream optical signal from the target ONU.

  As described above, the power measurement in the optical transceiver 11 and the power value calculation in the optical transceiver 11 are wasted by the configuration in which the power measurement in the optical transceiver 11 is performed after specifying that the transmission source of the upstream optical signal is the ONU 202 to be measured. Can be prevented.

  Further, in the communication monitoring apparatus according to the embodiment of the present invention, the timing signal generation unit 14 sets a timing at which the upstream optical signal should be measured every time the upstream optical signal is received via the PON line. Then, the optical power measurement control unit 13 uses the upstream optical signal from the target ONU as the measurement result of the upstream optical signal identified by the PON signal processing unit 12 as being the target ONU among the measurement results by the optical transceiver 11. Obtained as a signal power measurement result.

  As described above, the power measurement in the optical transceiver 11 is performed before specifying the transmission source of the upstream optical signal, so that the degree of freedom in selecting the measurement range of the upstream optical signal that is a burst signal is increased, and more appropriate power measurement is performed. be able to.

  In the communication monitoring apparatus according to the embodiment of the present invention, the PON signal processing unit 12 extracts and extracts the identifier given to the ONU 202 by the station side apparatus 101 from the upstream optical signal received via the PON line. Based on the identifier, the ONU 202 connected to the PON line is grasped.

  With such a configuration, for example, the ONU 202 connected to the PON line can be easily grasped as compared with the MAC address assigned in the user terminal.

  In the communication monitoring apparatus according to the embodiment of the present invention, the PON signal processing unit 12 extracts and extracts the identifier given to the ONU 202 by the station side apparatus 101 from the upstream optical signal received via the PON line. Based on the identifier, the ONU 202 that is the transmission source of the upstream optical signal is specified.

  With such a configuration, for example, the ONU 202 that is the transmission source of the upstream optical signal can be easily identified as compared with the MAC address assigned in the user terminal.

  In the communication monitoring apparatus according to the embodiment of the present invention, the display control unit 16 presents the measurement result acquired by the optical power measurement control unit 13 for each ONU 202 based on the specific result by the PON signal processing unit 12. To do.

  With such a configuration, for example, a person in charge of PON system construction can visually recognize the power value of the upstream optical signal for each ONU 202.

  In the communication monitoring apparatus according to the embodiment of the present invention, the optical power measurement control unit 13 determines all ONUs 202 recognized by the PON signal processing unit 12 as the ONUs 202 to be measured.

  With such a configuration, the power values of the upstream optical signals from all ONUs 202 connected to the PON line can be acquired for each ONU 202. For example, more useful information is provided by a person in charge of PON system construction. Is possible.

  In the communication monitoring apparatus according to the embodiment of the present invention, the optical power measurement control unit 13 acquires the power measurement results of the upstream optical signal transmitted from the target ONU a plurality of times, and averages the acquired measurement results. Is calculated.

  With such a configuration, even when the reception power of the upstream optical signal varies, a more accurate power value can be acquired.

  In the PON system according to the embodiment of the present invention, the communication monitoring apparatus 301 is provided separately from the station side apparatus 101 and the ONU 202, but the present invention is not limited to this. For example, the station-side device 101 may include the communication monitoring device 301.

  The above embodiment should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

[Appendix 1]
Communication in a communication system in which one or a plurality of home-side devices transmit a communication signal to a station-side device via a common communication line, and the communication signals from each home-side device to the station-side device are time-division multiplexed. A monitoring method,
Based on the communication signal received via the communication line, grasping the home device connected to the communication line;
Determining a target device that is a measurement-side home device from the grasped home-side devices; and
Identifying the home device as the transmission source of the communication signal based on the communication signal received via the communication line after determining the home device to be measured;
Obtaining a power measurement result of the communication signal from the target device based on the identification result of the transmission source.

[Appendix 2]
The communication monitoring method further includes:
Setting a timing for measuring the communication signal based on the communication signal received via the communication line after determining the target device;
The communication monitoring method according to claim 1, further comprising a step of measuring the power of the communication signal received via the communication line according to the set timing.

[Appendix 3]
In the step of setting the timing, when the identified transmission source of the communication signal is the target device, the timing for measuring the communication signal is set,
The communication monitoring method according to appendix 2, wherein in the step of acquiring the power measurement result, the power measured according to the timing is acquired as a power measurement result of the communication signal from the target device.

[Appendix 4]
In the step of setting the timing, a timing for measuring the communication signal is set every time the communication signal is received via the communication line,
In the step of acquiring the power measurement result, among the measurement results, the measurement result of the communication signal that is identified as a transmission source is the target device as the power measurement result of the communication signal from the target device. The communication monitoring method according to appendix 2, which is acquired.

[Appendix 5]
In the step of grasping the home-side device connected to the communication line, the identifier assigned to the home-side device by the station-side device is extracted from the communication signal received via the communication line and extracted. The communication monitoring method according to any one of appendix 1 to appendix 4, wherein the home-side device connected to the communication line is grasped based on the identifier.

[Appendix 6]
In the step of identifying the home device as the transmission source of the communication signal, the identifier assigned to the home device by the station side device is extracted from the communication signal received via the communication line, and extracted. The communication monitoring method according to any one of appendix 1 to appendix 5, wherein the home-side device that is a transmission source of the communication signal is identified based on the identifier.

[Appendix 7]
The communication monitoring method further includes:
The communication monitoring method according to any one of Supplementary Note 1 to Supplementary Note 6, including a step of presenting the acquired measurement result for each of the home-side devices based on the identification result of the transmission source.

[Appendix 8]
The communication monitoring method according to any one of appendix 1 to appendix 7, wherein, in the step of determining the target device, all of the grasped home-side devices are determined as home devices to be measured.

[Appendix 9]
In the step of acquiring the power measurement result, the power measurement result of the communication signal transmitted a plurality of times from the target device is acquired, and an average of the acquired measurement results is calculated. The communication monitoring method according to any one of the above.

11 Optical transceiver (power measurement unit)
12 PON signal processing part (grasping part and transmission source specifying part)
13 Optical power measurement control unit (measurement target determination unit and power information acquisition unit)
14 Timing signal generation unit (timing setting unit)
15 storage unit 16 display control unit (presentation unit)
21 PON port 22 optical reception processing unit 23 buffer memory 24 transmission processing unit 25 UNI port 26 reception processing unit 27 buffer memory 28 optical transmission processing unit 29 control unit 31 uplink IF unit 32
33 reception processing unit 34 transmission processing unit 35 PON transmission / reception unit 36 control unit 37, 38 FIFO
101 Station side equipment (OLT)
202 Home unit (ONU)
203-1 to 203-N PON line 204-1 to 204-N optical coupler 301 communication monitoring device 401 PON system SP splitter OPTF optical fiber

Claims (6)

Used in a communication system in which one or a plurality of home-side devices transmit communication signals to a station-side device via a common communication line, and the communication signals from each home-side device to the station-side device are time-division multiplexed. A communication monitoring device,
Based on the communication signal received via the communication line, a grasping unit for grasping the home-side device connected to the communication line;
Among the home-side devices grasped by the grasping unit, a measurement target determining unit for determining a target device that is a home device to be measured;
A transmission for identifying the home device as the transmission source of the communication signal based on the communication signal received via the communication line after the measurement target home device is determined by the measurement target determination unit Former specific department,
A power measurement unit for measuring the power of the communication signal received via the communication line;
A communication monitoring apparatus comprising: a power information acquisition unit configured to acquire a power measurement result of the communication signal from the target device from the power measurement unit based on a specification result by the transmission source specifying unit. The communication monitoring device further includes:
A timing setting unit for setting a timing for measuring the communication signal based on the communication signal received via the communication line after the measurement target determining unit determines the home device to be measured; Prepared,
The communication monitoring apparatus according to claim 1, wherein the power measurement unit measures the power of the communication signal according to the timing set by the timing setting unit.   The power information acquisition unit, when the transmission source of the communication signal identified by the transmission source identification unit is the target device, causes the timing setting unit to set a timing for measuring the communication signal, and the timing The communication monitoring apparatus according to claim 2, wherein the power measured by the power measurement unit is acquired as a power measurement result of the communication signal from the target apparatus. The timing setting unit sets a timing for measuring the communication signal every time the communication signal is received via the communication line,
The power information acquisition unit obtains, from the target device, the measurement result of the communication signal that is specified by the transmission source specifying unit as the target device among the measurement results by the power measurement unit. The communication monitoring apparatus according to claim 2, which is acquired as a power measurement result of the communication signal. The communication monitoring device further includes:
5. The apparatus according to claim 1, further comprising: a presentation unit that presents the measurement result acquired by the power information acquisition unit for each of the home-side devices based on the identification result by the transmission source identification unit. The communication monitoring apparatus according to item 1. Communication in a communication system in which one or a plurality of home-side devices transmit a communication signal to a station-side device via a common communication line, and the communication signals from each home-side device to the station-side device are time-division multiplexed. A monitoring method,
Based on the communication signal received via the communication line, grasping the home device connected to the communication line;
Determining a target device that is a measurement-side home device from the grasped home-side devices; and
Identifying the home device as the transmission source of the communication signal based on the communication signal received via the communication line after determining the home device to be measured;
Obtaining a power measurement result of the communication signal from the target device based on the identification result of the transmission source.

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