JP7094904B2 - Optical communication discrimination device and optical communication discrimination method - Google Patents

Description

The present invention relates to an optical communication discrimination device and an optical communication discrimination method.

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

In IEEE Std 802.3ah (registered trademark) -2004 (Non-Patent Document 1), a plurality of home-side devices (home-side devices: Optical Network Unit) share an optical communication line and station-side devices (station-side devices: One method of a passive optical network (PON: Passive Optical Network), which is a medium-shared communication for transmitting data with an Optical Line Thermal), is disclosed. That is, EPON (Ethernet (registered trademark) PON) in which all information including user information passing through the PON and control information for managing and operating the PON is communicated in the form of an Ethernet (registered trademark) frame, and EPON. An access control protocol (MPCP (Multi-Point Control Protocol)) and an OAM (Operations Addivision and Management) protocol are defined. By exchanging MPCP frames between the station-side device and the home-side device, joining, leaving, and uplink access multiplex control of the home-side device are performed. Further, Non-Patent Document 1 describes a method of registering a new home-side device, a report showing a bandwidth allocation request, and a gate showing a transmission instruction by an MPCP message.

As a next-generation technology of GE-PON, which is an EPON that realizes a communication speed of 1 gigabit / sec, 10G-EPON standardized as IEEE802.3av (registered trademark) -2009, that is, a communication speed of 10 gigabits / sec. Even in EPON equivalent to seconds, MPCP is a prerequisite for the access control protocol.

Patent Document 1 (Japanese Unexamined Patent Publication No. 2012-205290) discloses the following techniques. That is, the communication monitoring device monitors the control frame transmitted from the ONU to the OLT in the communication path between the OLT and the ONU in response to the transmission permission message transmitted from the OLT to the ONU. The unit, the control frame monitoring number measuring unit that measures the number of monitoring of the control frame monitored by the control frame monitoring unit in a certain period, and the monitoring of the control frame measured by the control frame monitoring number measuring unit in the fixed period. A communication permission determination unit for determining whether or not the ONU is permitted to communicate with the backbone network connected to the OLT based on the number is provided.

Japanese Unexamined Patent Publication No. 2012-205290

IEEE Std 802.3ah®-2004

Whether or not the ONU is permitted to communicate with the backbone network connected to the OLT based on the number of monitoring frames of the control frame transmitted from the ONU to the OLT in a certain period of time like the communication monitoring device described in Patent Document 1. In the configuration for determination, it may be difficult to accurately determine the connection state of the ONU.

Beyond such a technique described in Patent Document 1, a technique that monitors an optical signal transmitted in an optical communication system such as PON and enables good implementation of construction or maintenance of an optical access network is desired.

The present invention has been made to solve the above-mentioned problems, and an object thereof is to monitor optical signals transmitted in an optical communication system and enable good implementation of construction or maintenance of an optical access network. It is to provide a communication discrimination apparatus and an optical communication discrimination method.

(1) In order to solve the above problems, the optical communication discrimination device according to an aspect of the present invention is an optical signal from the home-side device to the station-side device in the optical transmission path between the station-side device and the home-side device. A determination to determine a connection state, which is a state related to communication between the home-side device and the station-side device, based on the photoelectric conversion unit that receives and converts it into an electric signal and the electric signal converted by the photoelectric conversion unit. The determination unit includes a unit and a presentation control unit that controls to present the determination result by the determination unit, and the determination unit is the number of frames included in the electric signal, which is the number of frames in a certain period of the first frame. , And the presence or absence of the second frame, which is different in type from the first frame, determines the connection state.

(5) In order to solve the above problems, the optical communication discriminating method according to a certain aspect of the present invention is an optical communication discriminating method in an optical communication discriminating device, and is used in an optical transmission line between a station-side device and a home-side device. A connection related to a step of receiving an optical signal from the home-side device to the station-side device and converting it into an electric signal, and communication of the home-side device with the station-side device based on the converted electric signal. In the step of determining the connection state, which includes a step of determining the state and a step of performing control for presenting the determination result of the connection state, in the step of determining the connection state, the first frame among the frames included in the electric signal is constant. The connection state is determined based on the number of frames, which is the number in the period, and the presence / absence of the second frame, which is different in type from the first frame.

According to the present invention, it is possible to monitor an optical signal transmitted in an optical communication system and to construct or maintain an optical access network in a good manner.

FIG. 1 is a diagram showing an example of a configuration of an optical communication system. FIG. 2 is a diagram showing a sequence of discovery operations by the station-side device and the newly connected home-side device of the optical communication system according to the first embodiment of the present invention. FIG. 3 is a diagram showing an example of the configuration of the optical communication discrimination device according to the first embodiment of the present invention. FIG. 4 is a diagram showing an example of frames transmitted and received in an optical communication system. FIG. 5 is a table showing an example of the number of MPCP frames per second according to the connection state of the home appliance. FIG. 6 is a flowchart defining an operation procedure when the optical communication discriminating device according to the first embodiment of the present invention determines the connection state of the home-side device. FIG. 7 is a diagram showing an example of the configuration of an optical communication system. FIG. 8 is a diagram showing an example of optical signals transmitted and received in the MC system. FIG. 9 is a diagram showing an example of the configuration of the optical communication discrimination device according to the second embodiment of the present invention. FIG. 10 is a flowchart defining an operation procedure when the optical communication discriminating device according to the second embodiment of the present invention discriminates the type of an optical signal. FIG. 11 is a flowchart defining an operation procedure when the optical communication discrimination apparatus according to the second embodiment of the present invention executes continuous optical discrimination processing. FIG. 12 is a flowchart defining an operation procedure when the optical communication discriminating device according to the second embodiment of the present invention executes a burst optical discriminating process.

First, the contents of the embodiments of the present invention will be listed and described.

(1) The optical communication discrimination device according to the embodiment of the present invention receives an optical signal from the home-side device to the station-side device in the optical transmission path between the station-side device and the home-side device and converts it into an electric signal. Based on the photoelectric conversion unit and the electric signal converted by the photoelectric conversion unit, a determination unit for determining a connection state which is a state related to communication between the home-side device and the station-side device, and a determination unit for determining the connection state. The determination unit includes a presentation control unit that controls to present the result, and the determination unit includes the number of frames included in the electric signal, which is the number of the first frame in a certain period, and the first frame. The connection state is determined based on the presence or absence of a second frame of a different type.

In this way, a variety of home-side devices can be used for each station-side device by determining the communication status of the home-side device based on the number of frames included in the optical signal and the presence or absence of a frame of a type different from that of the frame. Even if a state exists, various states can be discriminated by using the detection result of the frame transmitted from the home-side device to the station-side device. This makes it possible to more accurately determine the connection state of the home appliance. Therefore, it is possible to monitor the uplink optical signal and to construct or maintain an optical access network in a good manner. Further, since the communication status in the optical access network can be confirmed by using the optical communication discrimination device having such a simple configuration, the optical transmission line can be used without increasing the functionality of the station-side device or the home-side device. It is possible to prevent erroneous connection and crimping error at low cost.

(2) Preferably, in the connected state, the home-side device is not connected to the optical transmission line and the home-side device is connected to the optical transmission line, and the station-side device is connected to the home-side device. There is an unauthenticated state and an authentication state in which the home-side device is connected to the optical transmission line and the station-side device is authenticated.

With such a configuration, it is possible to determine various states of the unconnected state, the unauthenticated state, and the authenticated state as the connected state of the home appliance.

(3) Preferably, the presentation control unit further controls to present a state in which the number of frames is equal to or greater than a predetermined threshold value and the second frame is undetected.

With such a configuration, it is necessary to confirm the presence / absence of the second frame in order to determine the connection state of the home appliance, and it is possible to indicate that the second frame has not been detected. In order to determine the connection state, it is possible to present to the user or the like that the state is waiting for the detection result of the second frame. This makes it possible to improve the convenience of users and the like.

(4) Preferably, the photoelectric conversion unit can receive a burst optical signal and convert it into an electric signal, and can detect the presence or absence of an optical signal in the optical transmission path. Further, the type of the optical signal is determined based on the frame processing unit that detects a predetermined type of frame from the frames included in the optical signal, the detection result by the photoelectric conversion unit, and the detection result by the frame processing unit. A discrimination unit is provided, and the presentation control unit further controls to present the discrimination result by the discrimination unit.

With such a configuration, it is possible to realize an excellent optical communication discriminating device that discriminates the type of the optical signal and then determines the connection state of the home-side device that is the output source of the optical signal.

(5) The optical communication discrimination method according to the embodiment of the present invention is an optical communication discrimination method in an optical communication discrimination device, from the home side device to the station side in an optical transmission line between a station side device and a home side device. A step of receiving an optical signal to the device and converting it into an electric signal, a step of determining a connection state which is a state related to communication of the home-side device with the station-side device based on the converted electric signal, and the above-mentioned step. In the step of determining the connection state, which includes the step of performing control for presenting the determination result of the connection state, the number of frames, which is the number of the first frame among the frames included in the electric signal in a certain period, The connection state is determined based on the presence or absence of the second frame, which is different in type from the first frame.

In this way, by a method of determining the communication state of the home-side device based on the number of frames included in the optical signal and the presence / absence of a frame of a type different from the frame, the home-side device is diversified for each station-side device. Even if a state exists, various states can be discriminated by using the detection result of the frame transmitted from the home-side device to the station-side device. This makes it possible to more accurately determine the connection state of the home appliance. Therefore, it is possible to monitor the uplink optical signal and to construct or maintain an optical access network in a good manner. Further, since the communication status in the optical access network can be confirmed by using the optical communication discrimination device having such a simple configuration, the optical transmission line can be used without increasing the functionality of the station-side device or the home-side device. It is possible to prevent erroneous connection and crimping error at low cost.

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

<First Embodiment>
FIG. 1 is a diagram showing an example of a configuration of an optical communication system.

With reference to FIG. 1, the optical communication system 401 includes station side devices 302A and 302B provided in the station building 301, a plurality of home side devices 201A to 201D which are terminal stations, optical splitters 211A and 211B, and optical fiber. The fibers 212A and 212B are provided. The optical communication system 401 is, for example, a PON system. Hereinafter, each of the home side devices 201A to 201D will also be referred to as a home side device 201. Each of the station side devices 302A and 302B is also referred to as a station side device 302. Each of the optical fibers 212A and 212B is also referred to as an optical fiber 212.

In the optical communication system 401, the station side device 302 connected to the upper network and the plurality of home side devices 201 are connected in a tree shape by the optical fiber 212 which is an optical transmission line.

Specifically, the home-side devices 201A and 201B and the station-side device 302A are connected via the optical splitter 211A and the branched optical fiber 212A, and transmit and receive optical signals to and from each other. The home-side devices 201C and 201D and the station-side device 302B are connected to each other via an optical splitter 211B and a branched optical fiber 212B, and transmit and receive optical signals to and from each other. The optical signal includes a frame in which communication information and the like are stored.

User terminals 202A and 202B such as a personal computer are connected to the home appliances 201A and 201B, respectively. The user terminals 202A and 202B communicate with the host network via the optical communication system 401.

The optical communication system 401 may include a larger number of station-side devices 302, or may include a small number or a larger number of home-side devices 201 and an optical splitter. Further, a plurality of user terminals may be connected to one home-side device 201.

Here, the direction from the home side device 201 to the upper network is referred to as an up direction, and the direction from the upper network to the home side device 201 is referred to as a down direction. In the optical communication system 401, the uplink direction is time division multiple access (TDMA) and the downlink direction is time division multiplexing (TDM). In the optical communication system 401, the upstream optical signal (hereinafter, also referred to as an uplink optical signal) is a burst-shaped optical signal, that is, a burst optical signal. Here, the burst optical signal is a signal in which a period in which an optical signal exists and a period in which an optical signal does not exist coexist in the time domain.

For example, the home-side device 201 includes a home-side device 201 for 1G (1 gigabit / sec) and a home-side device 201 for 10G (10 gigabit / sec). For example, the station-side device 302 includes a station-side device 302 for 1G and a station-side device 302 for 10G.

The station-side device 302 for 10G can communicate with, for example, a plurality of types of home-side devices 201 having different communication speeds, that is, transmission rates, of frames to be transmitted or received.

More specifically, the station-side device 302 for 10G receives a frame of 1 Gbps from the home-side device 201 for 1G in the upstream direction, and transmits a frame of 1 Gbps to the home-side device 201 for 1G in the downlink direction. Further, the station-side device 302 for 10G receives a frame of 10 Gbps from the home-side device 201 for 10G in the upstream direction, and transmits a frame of 10 Gbps to the home-side device 201 for 10G in the downlink direction.

For example, the home-side device 201 for 1G corresponds to GE-PON, and the home-side device 201 for 10G and the station-side device 302 for 10G correspond to 10G-EPON.

In the optical communication system 401, the station-side device 302 performs a discovery operation at a predetermined cycle. The station-side device 302 detects the home-side device 201 newly connected to the optical fiber 212 by periodically performing the discovery operation, and assigns an LLID (Logical Link ID) to the detected home-side device 201. A communication connection with the home appliance 201 is established.

FIG. 2 is a diagram showing a sequence of discovery operations by the station-side device and the newly connected home-side device of the optical communication system according to the first embodiment of the present invention.

With reference to FIG. 2, when the discovery operation start timing is reached, the station-side device 302 transmits a discovery gate frame in order to detect the home-side device 201 newly connected to the optical fiber 212 (step S102). ..

Next, when the home-side device 201 newly connected to the optical fiber 212 receives the discovery gate frame, the register request frame, which is a frame including the registration request, is transmitted to the station-side device 302 (step S104).

As a result, the state related to the communication of the home-side device 201 with the station-side device 302 (hereinafter, also referred to as the connection state S of the home-side device 201) changes from the unconnected state to the unauthenticated state.

When the station-side device 302 receives a valid register request frame from the home-side device 201 in the discovery window Tdw designated by the discovery gate frame, the station-side device 302 performs a registration process including a process of allocating an LLID and a transmission band to the home-side device 201 (. Step S106).

Then, the station-side device 302 transmits a register frame in which the assigned LLID or the like is stored to the home-side device 201 (step S108).

Further, the station side device 302 transmits the gate frame in which the information of the allocated transmission band and the like is stored to the home side device 201 (step S110).

Next, when the home appliance 201 receives the register frame and the gate frame, it transmits a register ACK frame for confirming reception of the register frame (step S112). As a result, an MCPC link is established between the station-side device 302 and the home-side device 201.

Further, OAM frames are transmitted / received between the station-side device 302 in which the MCPC is established and the home-side device 201 (step S114). As a result, an OAM link is established between the station-side device 302 and the home-side device 201.

Next, the station-side device 302 performs an authentication process for authenticating the home-side device 201 (step S116).

Next, when the authentication of the home-side device 201 is completed, the station-side device 302 transmits an OLT register frame for notifying that the authentication has been completed to the home-side device 201 (step S118).

As a result, the connection state S of the home appliance 201 shifts from the unconnected state to the authentication state.

In this way, by exchanging MPCP frames such as register request frames, register frames, gate frames, and register ACK frames between the station side device 302 and the home side device 201, the home side device 201 is authenticated. Will be.

Even after the connection state S of the home-side device 201 has transitioned to the authentication state, uplink access multiplex control is performed by periodically exchanging MPCP frames between the station-side device 302 and the home-side device 201.

For example, in GE-PON, the transmission frequency of MPCP frames from the home-side device 201 to the station-side device 302 in the authenticated state is higher than the transmission frequency in the unauthenticated state.
[Task]

By the way, there is a need for a technique for confirming whether or not there is an erroneous connection or crimping error of the optical fiber 212 at the time of new installation of the optical communication system 401 or when switching the station side device 302 or the optical fiber 212.

Therefore, for example, when the station side device 302 and the home side device 201 are connected, the home side device 201 is based on the number of MPCP frames transmitted / received between the station side device 302 and the home side device 201. A method of determining the connection state S of the above and determining the appropriateness of the connection between the station-side device 302 and the home-side device 201 based on the determination result can be considered.

Specifically, when the station side device 302 and the home side device 201 are connected in the correct combination, the connection state S of the home side device 201 transitions to the authentication state, so that the home side device 201 is transferred to the station side device 302. The frequency of transmission of MPCP frames is high.

On the other hand, if a crimping error occurs even if the worker intends to connect the home side device 201 and the station side device 302, the number of MPCP frames transmitted from the home side device 201 is, for example, zero. become.

Therefore, like the communication monitoring device described in Patent Document 1, the connection state S of the home side device 201 is based on the number of control frames, for example, MPCP frames, transmitted from the home side device 201 to the station side device 302 in a certain period. , And based on the determination result, a method of detecting erroneous connection of the optical fiber 212, crimping error, and the like can be considered.

However, in the optical communication system 401 including the home-side device 201 for 10G, it may be difficult to accurately determine the connection state S of the home-side device 201 based on the MPCP frame.

For example, the transmission frequency of the MPCP frame by the home appliance 201 for 10G in the authenticated state, and the MPCP frame by the home appliance 201 for 1G in the unauthenticated state and the home appliance 201 for 10G in the unauthenticated state. There may be no big difference from the transmission frequency.

Specifically, the transmission frequency of the MPCP frame by the home appliance 201 for 10G which is in the authenticated state and the user terminal is not connected is the home appliance 201 for 1G which is in the unauthenticated state and the unauthenticated state. It is about the same as the transmission frequency of the MPCP frame by the home-side device 201 for 10G. Therefore, in the optical communication system 401 including the home appliance 201 for 10G, it is difficult to determine the connection state S of the home appliance 201 based on the number of MPCP frames in a certain period.

Therefore, in the optical communication discrimination device and the optical communication discrimination method according to the first embodiment of the present invention, such a problem is solved by the following configurations and operations.

[Configuration of optical communication discriminator]
FIG. 3 is a diagram showing an example of the configuration of the optical communication discrimination device according to the first embodiment of the present invention.

With reference to FIG. 3, the optical communication discrimination device 101 includes a light receiving unit 11, a photoelectric conversion unit 12, a signal processing unit 13, a determination unit 14, a presentation control unit 15, and a presentation unit 16. The optical communication discrimination device 101 is used in the optical communication system 401.

The optical communication discriminating device 101 monitors an optical signal transmitted in the communication path between the station side device 302 and the home side device 201. For example, the optical communication discriminating device 101 monitors the uplink light signal in the optical fiber 212, and determines the connection state S of the home-side device 201 based on the monitoring result.

When the installer or the user newly lays the optical communication system 401 or performs the switching work of the station side device 302 or the optical fiber 212, the builder or the user uses the optical communication discrimination device 101 between the station side device 302 and the home side device 201. Check the adequacy of the connection.

In the optical communication discrimination device 101, the light receiving unit 11 can be connected to the optical fiber 212 and receives the uplink optical signal in the optical fiber 212. More specifically, for example, the light receiving unit 11 is detachably connected to a connector which is an end portion of the optical fiber 212. As shown in FIG. 1, the optical fiber 212 is branched via, for example, a coupler 213, and the light receiving portion 11 is detachably connected to a connector which is an end portion of the branched portion of the optical fiber 212. It may be configured to be. Further, the light receiving unit 11 may be configured to receive an uplink light signal by condensing the light leaking from the optical fiber 212. The light receiving unit 11 outputs the received uplink signal to the photoelectric conversion unit 12.

The photoelectric conversion unit 12 includes, for example, a light receiving element, converts an optical signal received from the light receiving unit 11 into an electric signal, and outputs the light signal to the signal processing unit 13.

The signal processing unit 13 receives an electric signal from the photoelectric conversion unit 12, extracts a clock from the received electric signal, and samples the electric signal according to the timing of the extracted clock to regenerate the frame included in the electric signal. Configure. The signal processing unit 13 outputs the reconstructed frame to the determination unit 14.

The determination unit 14 receives a frame from the signal processing unit 13 and determines the connection state S of the home-side device 201 based on the received frame.

For example, in the determination unit 14, the connection state S of the home side device 201 is either the home side device 201 is not connected to the optical fiber 212 or the home side device 201 is connected to the optical fiber 212 and the home side device 201 is connected to the optical fiber 212. It is determined whether the unauthenticated state is not authenticated by the station side device 302, or the home side device 201 is connected to the optical fiber 212 and is in the authenticated state certified by the station side device 302.

Among the frames received from the signal processing unit 13, the determination unit 14 has a number of frames that is the number of the first frame, for example, an MPCP frame in a certain period, and a second frame, for example, a response frame that is different from the first frame. The connection state S of the home-side device 201 is determined based on the presence / absence. More specifically, the determination unit 14 determines the connection state S for each home appliance 201 based on the number of frames of the MPCP frame for each home appliance 201 and the presence / absence of the response frame.

Here, the response frame is a frame transmitted from the home-side device 201 in the authentication state to the station-side device 302, and information such as the connection status of the user terminals 202A and 202B to the home-side device 201 is stored. It is a frame. The home-side device 201 in the authenticated state periodically transmits a response frame to the station-side device 302, for example.

The determination unit 14 determines the connection state of the home-side device 201 based on the number of MPCP frames received from the signal processing unit 13 in a certain period and the presence / absence of response frames.

For example, the determination unit 14 confirms the number of MPCP frames (hereinafter, also referred to as the number of MPCP frames F per second) among one or a plurality of frames included in the uplink light signal received by the light receiving unit 11 in one second. do. Further, the determination unit 14 confirms whether or not the response frame is included in one or a plurality of frames included in the uplink light signal received by the light receiving unit 11 in 60 seconds.

FIG. 4 is a diagram showing an example of frames transmitted and received in an optical communication system.

With reference to FIG. 4, the frame transmitted / received in the optical communication system has a preamble field, a header field, a data field, and an FCS (Frame Check Sequence). The header field contains the destination address, the source address, and the frame type.

Different information is stored in the type in the header field of the MPCP frame and the type in the header field of the response frame. The determination unit 14 confirms the information stored in the type of the header field having low confidentiality in each frame received from the signal processing unit 13, so that the MPCP frame and the MPCP frame can be obtained from the plurality of frames received from the signal processing unit 13. Identify the response frame. Further, the determination unit 14, for example, by checking the information stored in the source address of the header field, among the plurality of home-side devices 201 connected to the optical fiber 212, the source of the MPCP frame and the response frame. By specifying the home-side device 201, the number of MPCP frames F per second and the presence / absence of response frames are confirmed for each home-side device 201.

For example, the determination unit 14 determines the connection state S of the home appliance 201 by using the threshold values ThA and ThB preset for the number of MPCP frames F per second. In the following, the threshold value ThA is smaller than the threshold value ThB.

The determination unit 14 compares the threshold value ThA with the number of MPCP frames F per second, and when the number of MPCP frames F per second is smaller than the threshold value ThA, the connection state S of the home-side device 201 is It is determined that the connection is not established.

On the other hand, the determination unit 14 compares the threshold value ThB with the number of MPCP frames F per second, and when the number of MPCP frames F per second is equal to or greater than the threshold value ThB, the connection of the home-side device 201 The state S is determined to be the authentication state.

Further, the determination unit 14 has one or more MPCP frames F per second having a threshold value ThA or more and less than the threshold value ThB, and is included in the uplink light signal received by the light receiving unit 11 in 60 seconds. When the response frame is detected from the frames of, it is determined that the connection state S of the home-side device 201 is the authentication state.

On the other hand, in the determination unit 14, the number of MPCP frames F per second is equal to or more than the threshold value ThA and less than the threshold value ThB, and 1 or 1 included in the uplink light signal received by the light receiving unit 11 in 60 seconds. When the response frame is not detected from the plurality of frames, it is determined that the connection state S of the home-side device 201 is an unauthenticated state.

The determination unit 14 notifies the presentation control unit 15 of the determination result of the connection state S of the home appliance 201.

The presentation control unit 15 controls to present the determination result by the determination unit 14 to the builder or the user. More specifically, for example, the presentation control unit 15 causes the presentation unit 16 such as an LED (Light Emitting Diode) or an LCD (Liquid Crystal Display) to display the connection state S of the home appliance 201 notified from the determination unit 14. Control. Alternatively, for example, the presentation control unit 15 transmits the information on the connection state of the home-side device 201 notified from the determination unit 14 to an external device such as a PC via an interface circuit (not shown). An external device such as a PC displays or stores the information received from the presentation control unit 15 as it is, after processing it, or storing it. In this case, the optical communication discrimination device 101 may be configured not to include the presentation unit 16.

As described above, when the number of MPCP frames F per second is equal to or greater than the threshold value ThA and less than the threshold value ThB, the determination unit 14 of the home-side device 201 is based on the presence or absence of a response frame in 60 seconds. Performs a process of determining the connection state S.

Therefore, for example, the number of MPCP frames per second is greater than or equal to the threshold value ThB, and the number of MPCP frames per second F is less than the threshold value ThA. When the number F is equal to or greater than the threshold value ThA and less than the threshold value ThB, it takes a long time for the determination unit 14 to determine the connection state S of the home-side device 201.

Therefore, for example, when the number of MPCP frames F per second is equal to or greater than the threshold value ThA and less than the threshold value ThB, the determination unit 14 determines whether or not there is a response frame in 60 seconds for 1 second. The undetected information indicating that the number of MPCP frames F per MPCP frame F is equal to or more than the threshold value ThA and less than the threshold value ThB and the response frame has not been detected is output to the presentation control unit 15.

When the presentation control unit 15 receives the undetected information from the determination unit 14, it presents to the installer or the user that the number of MPCP frames F per second is equal to or greater than the threshold value ThA and the response frame is undetected. Control.

FIG. 5 is a table showing an example of the number of MPCP frames per second according to the connection state S of the home appliance.

With reference to FIG. 5, the number of MPCP frames F transmitted from the unconnected 1G home appliance 201 and the unconnected 10G home appliance 201 per second is, for example, zero. The number of MPCP frames F transmitted from the unauthenticated 1G home appliance 201 and the unauthenticated 10G home appliance 201 per second is, for example, 400. The number of MPCP frames F transmitted per second from the home appliance 201 for 1G in the authentication state is, for example, 1000. The number of MPCP frames F transmitted per second from the home appliance 201 for 10G in the authentication state and to which the user terminal is connected is, for example, 1000. The number of MPCP frames F transmitted per second from the home appliance 201 for 10G in the authentication state and to which the user terminal is not connected is, for example, 400.

Therefore, for example, the determination unit 14 uses the threshold values ThA and ThB that can accurately determine the connection state S of the home side device 201 based on the number of MPCP frames F in each connection state S of the home side device 201. The connection state S of the side device 201 is determined.

More specifically, the threshold value ThA is larger than the number of MPCP frames F transmitted per second from the home-side device 201 for 1G in the unconnected state and the home-side device 201 for 10G in the unconnected state, and , A value smaller than the number of MPCP frames F transmitted per second from the unauthenticated 1G home appliance 201 and the unauthenticated 10G home appliance 201, for example 100.

The threshold value ThB is a value larger than the number of MPCP frames F transmitted from the unauthenticated 1G home appliance 201 and the unauthenticated 10G home appliance 201 per second, and It is a value smaller than the number of MPCP frames F transmitted per second from the home-side device 201 for 1G in the authentication state, and is, for example, 800.

[Operation flow]
The optical communication discriminating device 101 includes a computer including a memory, and an arithmetic processing unit such as a CPU in the computer reads a program including a part or all of each step of the following flowchart and sequence from the memory and executes the program. This program can be installed externally. This program is distributed in a state of being stored in a recording medium.

FIG. 6 is a flowchart defining an operation procedure when the optical communication discriminating device according to the first embodiment of the present invention determines the connection state of the home-side device.

With reference to FIG. 6, first, when the optical communication discriminator 101 receives the uplink signal transmitted in the optical fiber 212, the received uplink signal is converted into an electric signal and the frame is reconstructed from the electric signal. (Step S202).

Next, the optical communication discrimination device 101 counts the number of MPCP frames among the reconstructed plurality of frames, and acquires the number of MPCP frames F per second (step S204).

Next, the optical communication discrimination device 101 compares the number of MPCP frames F per second with the threshold value ThB (step S206).

Next, when the number of MPCP frames F per second is equal to or greater than the threshold value ThB (YES in step S208), the optical communication discriminating device 101 determines that the connection state S of the home-side device 201 is the authentication state. (Step S210).

Next, the optical communication discrimination device 101 presents to the user the determination result that the connection state S of the home side device 201 is the authentication state (step S212).

On the other hand, when the number of MPCP frames F per second is less than the threshold value ThB (NO in step S208), the optical communication discrimination device 101 compares the number of MPCP frames F per second with the threshold value ThA. (Step S214).

Next, when the number of MPCP frames F per second is less than the threshold value ThA (NO in step S216), the optical communication discriminating device 101 determines that the connected state S of the home-side device 201 is not connected. (Step S218).

Next, the optical communication discrimination device 101 presents to the user a determination result that the connection state S of the home side device 201 is not connected (step S212).

On the other hand, when the number of MPCP frames F per second is equal to or greater than the threshold value ThA (YES in step S216), the optical communication discriminating device 101 confirms the presence or absence of a response frame (step S220).

Next, the optical communication discriminating device 101 indicates that the number of MPCP frames F per second is equal to or greater than the threshold value ThA and the response frame has not been detected until the confirmation of the presence or absence of the response frame is completed. Presented to the user (step S222).

Next, when the optical communication discriminating device 101 detects a response frame in 60 seconds (YES in step S224), the optical communication discriminating device 101 determines that the connection state S of the home side device 201 is the authentication state (step S210).

Next, the optical communication discrimination device 101 ends the presentation that the response frame has not been detected, and presents the determination result that the connection state S of the home side device 201 is the authentication state to the user (step S212). ).

On the other hand, when the optical communication discriminating device 101 does not detect the response frame in 60 seconds (NO in step S224), the optical communication discriminating device 101 determines that the connection state S of the home side device 201 is an unauthenticated state (step S226).

Next, the optical communication discrimination device 101 ends the presentation that the response frame has not been detected, and presents the determination result that the connection state of the home side device 201 is the unauthenticated state to the user (step S212). ).

In the optical communication discrimination device according to the first embodiment of the present invention, the presentation control unit 15 is configured to control to present the connection state S of the home-side device 201 as the discrimination result by the determination unit 14. However, it is not limited to this. As a result of the above determination, the presentation control unit 15 determines the MAC (Media Access Control) address of the home-side device 201, the MEG-ID (Maintenance Entry Group-Identification), the power of the uplink signal output by the home-side device 201, and the corresponding response. The configuration may be such that control is performed to present the number of home-side devices 201 connected to the optical fiber 212 of the above.

Further, in the optical communication discrimination device according to the first embodiment of the present invention, the determination unit 14 determines the connection state S of the home-side device 201 based on the number of MPCP frames F per second and the presence / absence of response frames. However, the configuration is not limited to this. The determination unit 14 may be configured to determine the connection state S of the home appliance 201 based on the number of frames other than MPCP frames, for example, OAM frames in a certain period, and the presence / absence of frames other than response frames.

Further, in the optical communication discrimination device according to the first embodiment of the present invention, the determination unit 14 sets the connection state S of the home side device 201 to any of the unconnected state, the unauthenticated state, and the authenticated state. However, the configuration is not limited to this. The determination unit 14 may be configured to determine a state other than the above as the connection state S.

Further, in the optical communication discrimination device according to the first embodiment of the present invention, when the presentation control unit 15 receives the undetected information from the determination unit 14, the installer or the user is informed that the response frame has not been detected. The configuration is such that the control to be presented is performed, but the present invention is not limited to this. The presentation control unit 15 may be configured not to present to the builder or the user that the response frame has not been detected.

By the way, there is a need for a technique for confirming whether or not there is an erroneous connection or crimping error of the optical fiber 212 at the time of new installation of the optical communication system 401 or when switching the station side device 302 or the optical fiber 212.

On the other hand, in the optical communication discrimination device according to the first embodiment of the present invention, the photoelectric conversion unit 12 is a station-side device from the home-side device 201 to the home-side device 201 in the optical fiber 212 of the station-side device 302 and the home-side device 201. Receives an optical signal to 302 and converts it into an electrical signal. The determination unit 14 determines the connection state S of the home side device 201, which is a state related to communication with the station side device 302 of the home side device 201, based on the electric signal converted by the photoelectric conversion unit 12. The presentation control unit 15 controls to present the determination result by the determination unit 14. The determination unit 14 determines the connection state S of the home-side device 201 based on the number of frames included in the electric signal, which is the number of MPCP frames in a certain period, and the presence / absence of a response frame different from the MPCP frame. judge.

In this way, with the configuration that determines the state related to the communication of the home-side device 201 based on the number of frames included in the optical signal and the presence / absence of a frame of a type different from the frame, the home-side device 201 is configured for each station-side device 302. Even when various states are present, the various states can be discriminated by using the detection result of the frame transmitted from the home-side device 201 to the station-side device 302. As a result, the connection state S of the home appliance 201 can be determined more accurately.

Therefore, in the optical communication system 401 according to the first embodiment of the present invention, it is possible to monitor the uplink optical signal and to construct or maintain an optical access network in a good manner. Further, since the communication status in the optical access network can be confirmed by using the optical communication discrimination device having such a simple configuration, the optical fiber can be confirmed without making the station side device 302 or the home side device 201 etc. highly functional. It is possible to prevent erroneous connection and crimping error of 212 at low cost.

Further, in the optical communication discrimination device according to the first embodiment of the present invention, the connection state S of the home side device 201 includes a non-connected state in which the home side device 201 is not connected to the optical fiber and a home side device. There is an uncertified state in which 201 is connected to the optical fiber and is not certified by the station-side device 302, and a certified state in which the home-side device 201 is connected to the optical fiber and is certified by the station-side device 302.

With such a configuration, it is possible to determine various states of the unconnected state, the unauthenticated state, and the authenticated state as the connection state S of the home appliance 201.

Further, in the optical communication discrimination device according to the first embodiment of the present invention, the presentation control unit 15 further presents a state in which the number of MPCP frames is the threshold value ThA or more and the response frame is not detected. Control to do.

With such a configuration, it is necessary to confirm the presence / absence of the response frame in order to determine the connection state S of the home appliance, and it is possible to indicate that the response frame has not been detected. In order to make a determination, it is possible to present to the user or the like that the response frame is waiting for the detection result. This makes it possible to improve the convenience of users and the like.

In the optical communication discrimination method according to the first embodiment of the present invention, first, the optical communication discrimination device 101 is from the home side device 201 to the station side device 302 in the optical fiber 212 between the station side device 302 and the home side device 201. Receives an optical signal to and converts it into an electrical signal. Next, the optical communication discriminating device 101 determines the connection state S of the home-side device 201 based on the converted electric signal. Next, the optical communication discrimination device 101 controls to present the determination result of the connection state S. The optical communication discriminating device 101 determines the connection state S based on the number of frames included in the electric signal, which is the number of MPCP frames in a certain period, and the presence / absence of a response frame different from the MPCP frame.

In this way, by the method of determining the state related to the communication of the home-side device 201 based on the number of frames included in the optical signal and the presence / absence of a frame of a type different from the frame, the home-side device 201 is used for each station-side device 302. Even when various states are present, the various states can be discriminated by using the detection result of the frame transmitted from the home-side device 201 to the station-side device 302. As a result, the connection state S of the home appliance 201 can be determined more accurately.

Therefore, in the optical communication discrimination method according to the first embodiment of the present invention, it is possible to monitor an uplink optical signal and to construct or maintain an optical access network in a good manner. Further, since the communication status in the optical access network can be confirmed by using the optical communication discrimination device having such a simple configuration, the optical fiber can be confirmed without making the station side device 302 or the home side device 201 etc. highly functional. It is possible to prevent erroneous connection and crimping error of 212 at low cost.

Next, other embodiments of the present invention will be described with reference to the drawings. The same or corresponding parts in the drawings are designated by the same reference numerals and the description thereof will not be repeated.

<Second embodiment>
The present embodiment relates to an optical communication discriminating device having a function of discriminating the type of an optical signal as compared with the optical communication discriminating device according to the first embodiment. Except for the contents described below, the same as the optical communication discrimination device according to the first embodiment.

FIG. 7 is a diagram showing an example of the configuration of an optical communication system.

The optical communication system 402 is, for example, an optical communication system including a PON system and a media converter system (hereinafter, also referred to as an MC system).

With reference to FIG. 7, the optical communication system 402 includes station side devices 302A to 302D provided in the station building 301, a plurality of home side devices 201A to 202F which are terminal stations, optical splitters 211A and 211B, and optical fiber. The fibers 212A to 212D are provided. Hereinafter, in the description of this embodiment, each of the home side devices 201A to 201F will also be referred to as a home side device 201. Each of the station side devices 302A to 302D is also referred to as a station side device 302. Each of the optical fibers 212A to 212D is also referred to as an optical fiber 212.

For example, the station side devices 302A and 302B and the home side devices 201A to 202D correspond to the PON system, and the station side devices 302C and 302D and the home side devices 201E and 202F correspond to the MC system.

In the PON system, the station-side device 302 connected to the upper network and the home-side device 201 are connected in a tree shape by an optical fiber 212 which is an optical transmission line.

Specifically, the home-side devices 201A and 201B and the station-side device 302A are connected via the optical splitter 211A and the branched optical fiber 212A, and transmit and receive optical signals to and from each other. The home-side devices 201C and 201D and the station-side device 302B are connected to each other via an optical splitter 211B and a branched optical fiber 212B, and transmit and receive optical signals to and from each other. The optical signal includes a frame in which communication information and the like are stored.

In the MC system, the station-side device 302 and the home-side device 201 connected to the upper network are connected one-to-one by the optical fiber 212, respectively.

Specifically, the station-side device 302C and the home-side device 201E are connected via an optical fiber 212C, and transmit and receive optical signals to each other. The station-side device 302D and the home-side device 201F are connected via an optical fiber 212D, and transmit and receive optical signals to each other. The optical signal includes a frame in which communication information and the like are stored.

In the PON system, the uplink optical signal is a burst optical signal. In the MC system, the uplink light signal is a continuous optical signal, that is, a continuous optical signal. Here, the continuous optical signal is a signal in which an optical signal always exists in the time domain.

User terminals 202A, 202B, 202E such as a personal computer are connected to the home appliances 201A, 201B, 201E, respectively. The user terminals 202A, 202B, and 202E communicate with the host network via the optical communication system 401.

The optical communication system 401 may include a larger number of station-side devices 302, or may include a small number or a larger number of home-side devices 201 and an optical splitter. Further, a plurality of user terminals may be connected to one home-side device 201.

FIG. 8 is a diagram showing an example of optical signals transmitted and received in the MC system.

With reference to FIG. 8, in the optical signal transmitted and received between the station-side devices 302C and 302D and the home-side devices 201E and 201F in the MC system, the optical signal during the idle period and the optical signal during the frame period alternate in time. It is a continuous optical signal included.

Here, as the PON system, for example, there are B-PON specified by ITU-T G.983.1, GE-PON specified by IEEE802.3aa, and 10G-EPON specified by IEEE802.3av. .. Further, as the MC system, there are 1G-MC, 100M-MC, 10G-MC and the like.

The optical communication system 402 includes, for example, a plurality of station-side devices 302 and a plurality of home-side devices 201 corresponding to the various PON systems and the various MC systems, respectively.

[Task]
By the way, there is a need for a technique for confirming whether or not there is an erroneous connection or crimping error of the optical fiber 212 at the time of new installation of the optical communication system 402 or when switching the station side device 302 or the optical fiber 212.

Therefore, for example, the type of optical signal transmitted / received between the station-side device 302 and the home-side device 201 is discriminated, and based on the discriminated type, between the station-side device 302 and the home-side device 201. It is conceivable to judge the suitability of the connection.

However, in an optical communication system in which various optical communication methods are mixed, various types of optical signals are transmitted and received, which complicates the configuration and processing for discriminating the types of optical signals.

Therefore, the optical communication discrimination device and the optical communication discrimination method according to the second embodiment of the present invention solve such a problem by the following configurations and operations.

[Configuration of optical communication discriminator]
FIG. 9 is a diagram showing an example of the configuration of the optical communication discrimination device according to the second embodiment of the present invention.

With reference to FIG. 9, the optical communication discrimination device 102 includes a light receiving unit 21, a photoelectric conversion unit 22, a frame processing unit 24, a discrimination unit 25, a presentation control unit 26, and a presentation unit 27. The optical communication discrimination device 102 is used in the optical communication system 402.

The optical communication discriminating device 102 monitors an optical signal transmitted in the communication path between the station side device 302 and the home side device 201. For example, the optical communication discrimination device 102 monitors an optical signal in the optical fiber 212, for example, an uplink light signal, and determines the type of the uplink light signal based on the monitoring result.

When the installer or the user newly lays the optical communication system 402 or performs the switching work of the station side device 302 or the optical fiber 212, the builder or the user uses the optical communication discrimination device 102 between the station side device 302 and the home side device 201. Check the adequacy of the connection.

In the optical communication discrimination device 102, the light receiving unit 21 can be connected to the optical fiber 212 and receives the uplink optical signal in the optical fiber 212. The light receiving unit 21 can receive both a burst optical signal and a continuous optical signal. More specifically, for example, the light receiving unit 21 is detachably connected to a connector which is an end portion of the optical fiber 212. As shown in FIG. 7, the optical fiber 212 is branched via, for example, a coupler 213, and the light receiving portion 21 is detachably connected to a connector which is an end portion of the branched portion of the optical fiber 212. It may be configured to be. Further, the light receiving unit 21 may be configured to receive an uplink light signal by condensing the light leaking from the optical fiber 212. The light receiving unit 21 outputs the received uplink signal to the photoelectric conversion unit 22.

The photoelectric conversion unit 22 can receive a burst optical signal and convert it into an electric signal. Further, the photoelectric conversion unit 22 can receive a continuous optical signal and convert it into an electric signal. Further, the photoelectric conversion unit 22 can detect the presence or absence of an optical signal in the optical fiber 212.

More specifically, the photoelectric conversion unit 22 includes, for example, a light receiving element, converts a burst optical signal or a continuous optical signal received from the light receiving unit 21 into an electric signal, and outputs the signal to the frame processing unit 24.

Further, the photoelectric conversion unit 22 detects the presence / absence of an uplink light signal in the optical fiber 212, and outputs the detection information including the detection result to the discrimination unit 25. For example, the photoelectric conversion unit 22 generates a 1-bit signal (hereinafter, also referred to as an Rx_LOS signal) indicating the presence or absence of an uplink signal in the optical fiber 212 based on the detection result, and uses the generated Rx_LOS signal as detection information. Output to the determination unit 25.

For example, when the photoelectric conversion unit 22 detects an uplink signal in the optical fiber 212, it outputs a low-level signal as an Rx_LOS signal to the discrimination unit 25, and does not detect the uplink light signal in the optical fiber 212. , A high-level signal is output to the discrimination unit 25 as an Rx_LOS signal.

The frame processing unit 24 receives an electric signal from the photoelectric conversion unit 22, and detects a predetermined type of frame from the received electric signal.

For example, the frame processing unit 24 includes signal processing units 23A to 23D provided for each type of uplink light signal, and detection units 23E.

For example, the signal processing unit 23A corresponds to the uplink light signal of GE-PON, the signal processing unit 23B corresponds to the uplink light signal of 10G-EPON, and the signal processing unit 23C corresponds to the uplink light signal of 1G-MC. The signal processing unit 23D corresponds to an uplink signal of 100M-MC.

The signal processing units 23A to 23D receive an electric signal from the photoelectric conversion unit 22, extract a clock from the received electric signal, and sample the electric signal according to the timing of the extracted clock, whereby the frame included in the electric signal is included. Attempt to reconstruct. When the frames can be reconstructed, the signal processing units 23A to 23D output the reconstructed frames to the detection unit 23E.

Specifically, when the received uplink optical signal is a GE-PON optical signal, the signal processing unit 23A can reconstruct the frame. When the received uplink signal is an optical signal of 10G-EPON, the signal processing unit 23B can reconstruct the frame. When the received uplink light signal is a 1G-MC optical signal, the signal processing unit 23C can reconstruct the frame. When the received optical signal is an uplink optical signal of 100 M-MC, the signal processing unit 23D can reconstruct the frame.

For example, when the detection unit 23E receives a frame from the signal processing units 23A to 23D, the detection unit 23E confirms whether or not the received frame contains an idle pattern peculiar to 1G-MC. Further, the detection unit 23E confirms whether or not the received frame contains an idle pattern peculiar to 100M-MC.

With reference to FIG. 8 again, in the idle period in the frame of 1G-MC, a repeating pattern of, for example, 8B / 10B encoded K28.5 / D16.2 code is inserted as an idle pattern. In the idle period in the frame of 100M-MC, for example, a repeating pattern of a 4B / 5B encoded I code is inserted as an idle pattern.

The detection unit 23E stores the repetition pattern in the 1G-MC frame and the repetition pattern in the 100M-MC frame as model patterns. The detection unit 23E compares the frames received from the signal processing units 23A to 23D with each of the above model patterns, and detects a 1G-MC frame or a 100M-MC frame based on the comparison result.

The frame processing unit 24 may further include a signal processing unit that reconstructs and outputs a 10G-MC frame from the received electrical signal. In this case, the detection unit 23E stores, for example, a repeating pattern in a frame of 10G-MC as a model pattern, and based on the comparison result between the frame received from the signal processing unit and the model pattern, the 10G-MC Detects the frame of.

Further, when the detection unit 23E receives a frame from the signal processing units 23A to 23D, the detection unit 23E confirms whether or not the received frame includes a GE-PON MPCP frame or a 10G-EPON MPCP frame.

More specifically, the detection unit 23E detects the MPCP frame by checking the information stored in the header type of the frame received from the signal processing units 23A to 23D.

When the frame processing unit 24 detects various frames as described above, the frame processing unit 24 outputs the type information including the information of the detected frame type to the determination unit 25.

The discrimination unit 25 discriminates the type of the uplink light signal based on the detection result by the photoelectric conversion unit 22 and the detection result by the frame processing unit 24.

More specifically, the discrimination unit 25 discriminates the type of the optical signal based on the number of transitions of the level of the Rx_LOS signal received from the photoelectric conversion unit 22 and the type information received from the frame processing unit 24.

For example, the discriminating unit 25 determines that the optical signal is a burst optical signal when the optical fiber 212 transitions from the state where the optical signal is present to the state where the optical signal is not present a predetermined number of times within a predetermined time. The predetermined time is larger than the cycle of the discovery operation by the station-side device 302, and is, for example, twice or more the cycle of the discovery operation.

More specifically, the discriminating unit 25 determines whether the optical signal is a burst optical signal or a continuous optical signal by using a preset threshold value ThC regarding the number of transitions of the Rx_LOS signal per unit time. do.

That is, the discrimination unit 25 compares the number of transitions N per unit time of the Rx_LOS signal with the threshold value ThC, and when the number of transitions N is equal to or greater than the threshold value ThC, the received optical signal is a burst optical signal. to decide. On the other hand, when the number of transitions of the Rx_LOS signal per unit time is zero, the discrimination unit 25 determines that the received optical signal is a continuous optical signal.

When the discriminating unit 25 determines that the received optical signal is a continuous optical signal and the type of the frame included in the type information received from the frame processing unit 24 is 1G-MC, the type of the optical signal. Is determined to be a 1G-MC optical signal.

Further, when the discriminating unit 25 determines that the received optical signal is a continuous optical signal and the type of the frame included in the type information received from the frame processing unit 24 is 100M-MC, the optical signal. Is determined to be a 100M-MC optical signal.

On the other hand, when the discriminating unit 25 determines that the received optical signal is a continuous optical signal and does not receive the type information from the frame processing unit 24, the type of the optical signal is set to 1G-MC and 100M-. It is determined that it is an optical signal of an MC system other than MC, for example, 10G-MC.

When the discriminating unit 25 determines that the received optical signal is a burst optical signal and the type of the frame included in the type information received from the frame processing unit 24 is GE-PON, the type of the optical signal. Is determined to be an optical signal of GE-PON.

Further, when the discriminating unit 25 determines that the received optical signal is a burst optical signal and the type of the frame included in the type information received from the frame processing unit 24 is 10G-EPON, the optical signal. Is determined to be a 10G-EPON optical signal.

On the other hand, when the discriminating unit 25 determines that the received optical signal is a burst optical signal and does not receive the type information from the frame processing unit 24, the type of the optical signal is GE-PON and 10G-. It is determined that it is an optical signal of a PON system other than EPON, for example, B-PON.

The presentation control unit 26 controls to present the discrimination result by the discrimination unit 25 to the builder or the user. More specifically, for example, the presentation control unit 26 controls to display the type of the optical signal notified from the discrimination unit 25 on the presentation unit 27 such as an LED or an LCD. Alternatively, for example, the presentation control unit 15 transmits information on the type of optical signal notified from the discrimination unit 25 to an external device such as a PC via an interface circuit (not shown). An external device such as a PC displays or stores the information received from the presentation control unit 26 as it is, after processing it, or storing it. In this case, the optical communication discrimination device 102 may be configured not to include the presentation unit 27.

[Operation flow]
The optical communication discriminating device 102 includes a computer including a memory, and an arithmetic processing unit such as a CPU in the computer reads a program including a part or all of each step of the following flowchart and sequence from the memory and executes the program. This program can be installed externally. This program is distributed in a state of being stored in a recording medium.

FIG. 10 is a flowchart defining an operation procedure when the optical communication discriminating device according to the second embodiment of the present invention discriminates the type of an optical signal.

With reference to FIG. 10, first, when the optical communication discriminator 102 receives the uplink signal transmitted in the optical fiber 212, the received uplink signal is converted into an electric signal and the frame is reconstructed from the electric signal. (Step S302).

Next, the optical communication discrimination device 102 acquires the number of transitions N of the Rx_LOS signal within a predetermined time (step S304).

Next, when the number of transitions N of the Rx_LOS signal within a predetermined time is zero (YES in step S306), the optical communication discriminating device 102 determines that the optical signal is a continuous optical signal (step S308).

Next, the optical communication discrimination device 102 performs continuous light discrimination processing for discriminating the type of continuous optical signal.

On the other hand, when the transition number N of the Rx_LOS signal within a predetermined time is not zero (NO in step S306), the optical communication discrimination device 102 compares the transition number N with the threshold value ThC (step S312).

Next, when the number of transitions N is equal to or greater than the threshold value ThC (YES in step S314), the optical communication discriminating device 102 determines that the optical signal is a burst optical signal (step S316).

Next, the optical communication discrimination device 102 performs a burst light discrimination process for discriminating the type of burst light.

On the other hand, when the number of transitions N is less than the threshold value ThC (NO in step S314), the optical communication discriminating device 102 again acquires the number of transitions N of the Rx_LOS signal within a predetermined time (step S304).

FIG. 11 is a flowchart defining an operation procedure when the optical communication discrimination apparatus according to the second embodiment of the present invention executes continuous optical discrimination processing.

With reference to FIG. 11, first, the optical communication discriminating device 102 detects an idle pattern in a frame included in the optical signal, and compares the detected idle pattern with the model pattern (step S402).

Next, when the detected idle pattern matches the 1G-MC model pattern (YES in step S404), the optical communication discriminating device 102 determines that the type of the optical signal is the 1G-MC optical signal (step). S406).

Next, the optical communication discrimination device 102 presents to the user a discrimination result indicating that the type of the optical signal is a 1G-MC optical signal (step S408).

On the other hand, in the optical communication discrimination device 102, the detected idle pattern does not match the 1G-MC model pattern (NO in step S404), and the detected idle pattern matches the 100M-MC model pattern. (YES in step S410), it is determined that the type of the optical signal is an optical signal of 100M-MC (step S412).

Next, the optical communication discrimination device 102 presents to the user a discrimination result indicating that the type of the optical signal is an optical signal of 100M-MC (step S408).

On the other hand, in the optical communication discrimination device 102, the detected idle pattern does not match the 1G-MC model pattern (NO in step S404), and the detected idle pattern does not match the 100M-MC model pattern. (NO in step S410), it is determined that the type of optical signal is an optical signal of 10G-MC (step S414).

Next, the optical communication discrimination device 102 presents to the user a discrimination result indicating that the type of the optical signal is an optical signal of 10G-MC (step S408).

The optical communication discrimination device 102 monitors the Rx_LOS signal and the idle pattern after presenting the discrimination result to the user. That is, after discriminating the type of the optical signal, the discriminating unit 25 newly discriminates the type of the optical signal based on the new detection information received from the photoelectric conversion unit 22 and the new type information received from the frame processing unit 24. (Step S416).

Next, when the optical communication discrimination device 102 detects the transition of the Rx_LOS signal (YES in step S418), the optical communication discrimination device 102 receives the uplink light signal transmitted in the optical fiber 212 and converts the received uplink light signal into an electric signal. At the same time, the frame is reconstructed from the electric signal (step S302).

Next, the optical communication discrimination device 102 acquires the number of transitions N of the Rx_LOS signal within a predetermined time (step S304).

On the other hand, when the optical communication discrimination device 102 does not detect the transition of the Rx_LOS signal (NO in step S418) and detects the change in the idle pattern (YES in step S422), the detected idle pattern is used again. Compare with the model pattern (step S402).

On the other hand, when the optical communication discrimination device 102 does not detect the transition of the Rx_LOS signal (NO in step S418) and does not detect the change in the idle pattern (NO in step S422), the Rx_LOS signal and the frame are monitored. Continue (step S416).

FIG. 12 is a flowchart defining an operation procedure when the optical communication discriminating device according to the second embodiment of the present invention executes a burst optical discriminating process.

With reference to FIG. 12, first, the optical communication discriminating device 102 detects the MPCP frame included in the optical signal and compares the detected MPCP frame with the model pattern (step S502).

Next, when the detected MPCP frame matches the model pattern of the GE-PON (YES in step S504), the optical communication discriminating device 102 determines that the type of the optical signal is the optical signal of the GE-PON (step). S506).

Next, the optical communication discrimination device 102 presents to the user a discrimination result indicating that the type of the optical signal is a GE-PON optical signal (step S508).

On the other hand, in the optical communication discrimination device 102, the detected MPCP frame does not match the GE-PON model pattern (NO in step S504), and the detected MPCP frame matches the 10G-EPON model pattern. (YES in step S510), it is determined that the type of the optical signal is an optical signal of 10G-EPON (step S512).

Next, the optical communication discrimination device 102 presents to the user a discrimination result indicating that the type of the optical signal is an optical signal of 10G-EPON (step S508).

On the other hand, in the optical communication discrimination device 102, the detected MPCP frame does not match the GE-PON model pattern (NO in step S504), and the detected MPCP frame does not match the 10G-EPON model pattern. (NO in step S510), it is determined that the type of optical signal is an optical signal of B-PON (step S514).

Next, the optical communication discrimination device 102 presents to the user a discrimination result indicating that the type of the optical signal is a B-PON optical signal (step S508).

After presenting the discrimination result to the user, the optical communication discrimination device 102 continues to monitor the Rx_LOS signal and the frame. That is, after discriminating the type of the optical signal, the discriminating unit 25 newly discriminates the type of the optical signal based on the new detection information received from the photoelectric conversion unit 22 and the new type information received from the frame processing unit 24. (Step S516).

Next, when the Rx_LOS signal does not transition for a certain period of time (YES in step S518), the optical communication discrimination device 102 receives the uplink signal transmitted in the optical fiber 212 and converts the received uplink signal into an electric signal. At the same time, the frame is reconstructed from the electric signal (step S302).

Next, the optical communication discrimination device 102 acquires the number of transitions N of the Rx_LOS signal within a predetermined time (step S304).

On the other hand, when the optical communication discrimination device 102 detects the transition of the Rx_LOS signal (NO in step S518) and detects the change of the MPCP frame (YES in step S522), the detected MPCP frame is used again. Compare with the model pattern (step S502).

On the other hand, when the optical communication discrimination device 102 does not detect the transition of the Rx_LOS signal (NO in step S518) and does not detect the change of the MPCP frame (NO in step S522), the Rx_LOS signal and the frame are monitored. Continue (step S516).

The optical communication discrimination device 102 according to the second embodiment of the present invention includes a light receiving unit 21, a photoelectric conversion unit 22, a frame processing unit 24, a discrimination unit 25, a presentation control unit 26, and a presentation unit. Although it is said that the configuration includes 27, the configuration is not limited to this. The optical communication discrimination device 102 further includes a determination unit 14 of the optical communication discrimination device 101 according to the first embodiment of the present invention, and the discrimination unit 25 indicates that the type of optical signal is GE-PON or 10G-EPON. When the determination is made, the determination unit 14 may be configured to determine the connection state of the home-side device 201.

With such a configuration, it is possible to realize an excellent optical communication discriminating device that discriminates the type of the optical signal and then determines the connection state S of the home-side device 201 that is the output source of the optical signal.

Further, in the optical communication discrimination device 102 according to the second embodiment of the present invention, when the discrimination unit 25 transitions from the state where the optical fiber 212 has the optical signal to the state where the optical signal does not exist two or more predetermined times within a predetermined time. However, the configuration is such that the optical signal is determined to be a burst optical signal, but the present invention is not limited to this. The discriminating unit 25 may be configured to determine that the optical signal is a burst optical signal when the optical fiber 212 makes a transition from the presence of the optical signal to the absence of the optical signal once within a predetermined time.

As described above, in the optical communication discrimination device according to the second embodiment of the present invention, the photoelectric conversion unit 22 transfers from the home-side device to the station-side device in the optical fiber 212 between the station-side device and the home-side device. Receives an optical signal and converts it into an electrical signal. The frame processing unit 24 detects a predetermined type of frame from the frames included in the optical signal. The discriminating unit 25 discriminates the type of optical signal. The presentation control unit 26 controls to present the discrimination result by the discrimination unit 25. The photoelectric conversion unit 22 can receive a burst optical signal and convert it into an electric signal, and can detect the presence or absence of an optical signal in the optical fiber 212. The discrimination unit 25 discriminates the type of the optical signal based on the detection result by the photoelectric conversion unit 22 and the detection result by the frame processing unit 24.

In this way, optical communication in which various optical communication methods coexist is configured by monitoring the uplink optical signal and determining the type of optical signal based on the detection result of the presence or absence of the optical signal and the detection result of a predetermined type of frame. In the system, the type of optical signal can be determined more accurately. Further, for example, when the optical communication system 402 is newly installed or when the station side device 302 or the optical fiber 212 is switched, the optical communication method can be confirmed by using the optical communication discrimination device 102, so that each optical fiber can be confirmed. It is possible to eliminate the need for prior confirmation by an operator of the optical communication method corresponding to 212. Furthermore, by comparing the equipment database that summarizes each optical fiber 212 and the corresponding optical communication method with the optical communication method that was actually confirmed using the optical communication discrimination device, it becomes easy to manage and update the equipment database. ..

Therefore, in the optical communication discrimination device according to the second embodiment of the present invention, it is possible to monitor the uplink optical signal transmitted in the optical communication system and to construct or maintain an optical access network in a good manner. Further, depending on the configuration in which the presence or absence of an optical signal in the optical fiber is detected using a configuration capable of receiving a burst optical signal, a predetermined type of frame included in the optical signal is detected, and each detection result is used, for example, a plurality of types are used. The type of optical signal can be discriminated with a simple configuration as compared with a configuration in which a filter, a circuit, or the like for receiving an optical signal is provided. Then, since the optical access communication method of the optical access network can be confirmed by using the discriminating device having such a simple configuration, the optical fiber 212 is erroneously used without making the master station or the terminal station highly functional. Connection and crimping mistakes can be prevented at low cost.

Further, in the optical communication discrimination device according to the second embodiment of the present invention, the station side device 302 periodically performs a discovery operation. The discriminating unit 25 determines that the optical signal is a burst optical signal when the optical fiber 212 transitions from the state where the optical signal is present to the state where the optical signal is not present a predetermined number of times within a predetermined time. The predetermined time is larger than the cycle of the discovery operation.

As described above, by configuring the home appliance 201 to use the frame transmitted to the station appliance 302 as a response to the discovery operation of the station appliance 302, it is possible to perform determination using a more appropriate frame.

Further, in the optical communication discrimination device according to the second embodiment of the present invention, after the discrimination unit 25 discriminates the type of the optical signal, a new detection result by the photoelectric conversion unit 22 and a new detection result by the frame processing unit 24 Based on the detection result, the type of optical signal is newly determined.

With such a configuration, the type of optical signal changes due to the activation of the home-side device 201, the change in the optical signal when the optical fiber 212 is connected to the home-side device 201, and the replacement of the optical fiber 212 with the home-side device 201. It is possible to obtain a discrimination result that follows.

Since other configurations and operations are the same as those of the optical communication discriminating device according to the first embodiment, detailed description thereof will not be repeated here.

It should be considered that the above embodiments are exemplary in all respects and not restrictive. The scope of the present invention is shown by the scope of claims rather than the above description, and is intended to include all modifications within the meaning and scope equivalent to the scope of claims.

The above description includes the features described below.
[Appendix 1]
A photoelectric conversion unit that receives an optical signal from the home-side device to the station-side device and converts it into an electric signal in an optical transmission path between the station-side device and the home-side device.
A determination unit for determining a connection state, which is a state related to communication of the home-side device with the station-side device, based on the electric signal converted by the photoelectric conversion unit.
It is provided with a presentation control unit that controls the presentation of the determination result by the determination unit.
The determination unit is based on the number of frames included in the electric signal, which is the number of frames in a certain period of the first frame, and the presence / absence of a second frame different from the first frame. Judge the connection status and
When the number of frames is less than a predetermined threshold value, the determination unit determines that the connection state is not connected, the number of frames is equal to or more than the predetermined threshold value, and the second frame is not detected. In this case, it is determined that the user is in the unauthenticated state, and when the number of frames is equal to or greater than the predetermined threshold value and the second frame is detected, it is determined that the user is in the authenticated state.
The discriminant unit determines that the optical signal is a continuous optical signal when the optical transmission path transitions from the presence of the optical signal to the absence of the optical signal zero times or once within a predetermined time. ..

[Appendix 2]
The photoelectric conversion unit can receive a burst optical signal and convert it into an electric signal, and can detect the presence or absence of an optical signal in the optical transmission line.
The optical communication discriminating device further includes
A frame processing unit that detects a predetermined type of frame from the frames included in the optical signal, and a frame processing unit.
A discriminant unit for discriminating the type of the optical signal based on the detection result by the photoelectric conversion unit and the detection result by the frame processing unit is provided.
The presentation control unit further controls to present the discrimination result by the discrimination unit.
The station-side device periodically performs a discovery operation and performs a discovery operation.
The discriminating unit determines that the optical signal is a burst optical signal when the optical transmission path transitions from the presence of the optical signal to the absence of the optical signal a predetermined number of times within a predetermined time.
The optical communication discriminating device whose predetermined time is at least twice the cycle of the discovery operation.

[Appendix 3]
After discriminating the type of the optical signal, the discriminating unit newly discriminates the type of the optical signal based on the new detection result by the photoelectric conversion unit and the new detection result by the frame processing unit. Communication discriminator.

[Appendix 4]
A photoelectric conversion unit that receives an optical signal from the home-side device to the station-side device and converts it into an electric signal in an optical transmission path between the station-side device and the home-side device.
A frame processing unit that detects a predetermined type of frame from the frames included in the optical signal, and
A discriminator that discriminates the type of optical signal and
It is provided with a presentation control unit that controls the presentation of the discrimination result by the discrimination unit.
The photoelectric conversion unit can receive a burst optical signal and convert it into an electric signal, and can detect the presence or absence of an optical signal in the optical transmission line.
The discriminating unit is an optical communication discriminating device that discriminates the type of the optical signal based on the detection result by the photoelectric conversion unit and the detection result by the frame processing unit.

[Appendix 5]
This is an optical communication discrimination method in an optical communication discrimination device.
A step of receiving an optical signal from the home-side device to the station-side device in an optical transmission line between the station-side device and the home-side device and converting it into an electric signal.
A step of detecting a predetermined type of frame from the frames included in the optical signal, and
The step of determining the type of the optical signal and
Including a step of performing control for presenting the determination result of the type of the optical signal.
In the step of converting to the electric signal, it is possible to receive the burst optical signal and convert it into an electric signal, and it is possible to detect the presence or absence of the optical signal in the optical transmission line.
In the step of determining the type of the optical signal, an optical communication discrimination method for determining the type of the optical signal based on the detection result of the presence or absence of the optical signal and the detection result of the frame.

11 Light receiving unit 12 Photoelectric conversion unit 13 Signal processing unit 14 Judgment unit 15 Presentation control unit 16 Presenting unit 21 Light receiving unit 22 Photoelectric conversion unit 23A to 23D Signal processing unit 23E Detection unit 25 Discrimination unit 26 Presentation control unit 27 Presentation unit 101 Optical communication Discriminator 102 Optical communication discriminator

Claims (5)

A photoelectric conversion unit that receives an optical signal from the home-side device to the station-side device and converts it into an electric signal in an optical transmission path between the station-side device and the home-side device.
A determination unit for determining a connection state, which is a state related to communication of the home-side device with the station-side device, based on the electric signal converted by the photoelectric conversion unit.
It is provided with a presentation control unit that controls the presentation of the determination result by the determination unit.
The determination unit is based on the number of frames included in the electric signal, which is the number of frames in a certain period of the first frame, and the presence / absence of a second frame different from the first frame. An optical communication discriminator that determines the connection status. The connected state includes an unconnected state in which the home-side device is not connected to the optical transmission line and an unauthenticated state in which the home-side device is connected to the optical transmission line and is not authenticated by the station-side device. The optical communication discrimination device according to claim 1, wherein the home-side device is connected to the optical transmission line and the station-side device is authenticated. The optical communication according to claim 1 or 2, wherein the presentation control unit further controls to present a state in which the number of frames is equal to or greater than a predetermined threshold value and the second frame is not detected. Discriminating device. The photoelectric conversion unit can receive a burst optical signal and convert it into an electric signal, and can detect the presence or absence of an optical signal in the optical transmission line.
The optical communication discriminating device further includes
A frame processing unit that detects a predetermined type of frame from the frames included in the optical signal, and a frame processing unit.
A discriminant unit for discriminating the type of the optical signal based on the detection result by the photoelectric conversion unit and the detection result by the frame processing unit is provided.
The optical communication discrimination device according to any one of claims 1 to 3, wherein the presentation control unit further controls to present the discrimination result by the discrimination unit. This is an optical communication discrimination method in an optical communication discrimination device.
A step of receiving an optical signal from the home-side device to the station-side device in an optical transmission line between the station-side device and the home-side device and converting it into an electric signal.
Based on the converted electric signal, a step of determining a connection state, which is a state related to communication of the home-side device with the station-side device, and a step of determining the connection state.
Including the step of performing control for presenting the determination result of the connection state.
In the step of determining the connection state, among the frames included in the electric signal, the number of frames, which is the number of the first frame in a certain period, and the presence / absence of the second frame different from the first frame. An optical communication determination method for determining the connection state based on the above.

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