JP2017147599A - Subscriber side termination device, station side termination device, point-to-point optical communication system, and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a subscriber side termination device, station side termination device, point-to-point optical communication system, and program that can perform initial setting necessary to process signals with various speeds regardless of their protocols from a remote place in a point-to-point WDM device that does not perform a frame termination process.SOLUTION: A subscriber side termination device 10 connected with a station side termination device via an optical line and also connected with a prescribed apparatus comprises: clock signal reproduction units 14, 20 that reproduce a clock signal from a signal received from each of the station side termination device and the prescribed apparatus; a request unit that requests the station side termination device to provide setting information on the clock signal reproduction units 14, 20 when the subscriber side termination device 10 starts; and a setting unit 24 that sets the clock signal reproduction units according to the setting information received from the station side termination device.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a subscriber-side terminator, a station-side terminator, a point-to-point type optical communication system, and a program, and in particular, wavelength division using a subscriber-side terminator and a station-side terminator of an optical access device. It relates to an initial setting applied to a point-to-point system by multiplexing.

  A point-to-point (hereinafter referred to as “PtP-WDM”) system using wavelength division multiplexing (hereinafter “WDM”) uses an existing optical fiber network, for example, a PON (Passive Optical Network), and an existing service. One-to-one communication is realized by using different wavelengths.

  In recent years, an optical access network called FTTH (Fiber To The Home) using an optical fiber as a transmission path has been widespread for the purpose of providing high-speed and broadband broadband services to private homes. In many cases, an optical access system called a PON (Passive Optical Network) system is used.

  FIG. 5 shows an outline of the PON system. As shown in FIG. 5, the PON system 250 includes an OLT (Optical Line Terminal) 252 and a plurality of ONUs (Optical Subscriber Units) 258 (258-1 to 258-m: m is an integer of 2 or more). ing. The OLT 252 includes a control device 254 that controls the PON system and a plurality of OSUs (Optical Subscriber Units) 256 (256-1 to 246-n: n is an integer). Each OSU 256 is connected to a plurality of ONUs 258 via an optical splitter 260. In the PON system 250 having such a configuration, one-to-N communication is performed between the OLT 252 and the m ONUs 258.

  At present, further studies are being conducted to provide a new service using the optical fiber network used in the PON system as described above, using a wavelength different from the wavelength of the existing PON. Meanwhile, ITU-T (International Telecommunication Union Telecommunication Standardization Sector) G. In 989, a standard for performing point-to-point communication by wavelength multiplexing as described above is standardized.

  By the way, optical fibers used for communication are laid underground or aerial with high construction costs. Therefore, sharing of optical fibers by wavelength multiplexing is also important in the sense of effectively utilizing the bandwidth of optical fibers.

  On the other hand, in order to connect communication devices and perform communication, a certain promise is required. This promise is commonly referred to as a communication protocol. For example, in a communication service applied by a telecommunications carrier, various rules are set for safe and reliable communication. A user who uses the service introduces a device that complies with the rules, and uses the service of the carrier.

  For example, when a certain company (user) receives a service between a certain point (A point) and another point (B point) from a specific communication carrier, it contracts with the service provided by the communication carrier, The point A and the point B are connected via a communication carrier's device or through a transmission line owned by the communication carrier.

  In this case, from the user's standpoint, since there are more merits as there are fewer restrictions due to the above-mentioned rules, there may be a case where the user borrows only a transmission line (optical fiber) owned by the communication carrier and communicates. An optical fiber in such a communication method may be called a dark fiber. In the case of dark fiber, the connection rules are only physical conditions such as the core diameter and type of optical fiber, fiber characteristics, and connector type. In communication using a dark fiber, a user may use it without attaching connection conditions such as speed and frame termination rules. This is so that even if the type of the communication device and the interface condition that the user has are changed, the connection can be continued without changing.

  An example of the configuration of the simplest PtP optical communication system using a dark fiber is shown in FIG. In the PtP optical communication system 100 a shown in FIG. 6A, the communication device 102 is installed at the point A, and the communication device 104 is installed at the point B. And the dark fiber 200a is connected between the communication apparatuses 102 and 104, and both are communicating using the optical signal of wavelength (lambda) 1. However, in a configuration such as the PtP optical communication system 100a, the communication devices 102 and 104 installed oppositely occupy one dark fiber, which is not efficient.

  An optical communication system that improves this point is a PtP-WDM system 100b shown in FIG. 6B. In the PtP-optical communication system 100b, a communication device 106 is installed at a point A in addition to the communication device 102, and a communication device 108 is installed at a point B in addition to the communication device 104. The communication device 102 and the communication device 106 are multiplexed by a WDM optical coupler 110 (2: 1 optical coupler) and connected to one end of a dark fiber 200b. The communication device 104 and the communication device 108 are multiplexed by the optical coupler 112 and connected to the other end of the dark fiber 200b. The communication device 102 and the communication device 104 communicate using an optical signal having a wavelength λ1, and the communication device 106 and the communication device 108 communicate using an optical signal having a wavelength λ2. By extending such a configuration and adopting a communication device and a PtP-WDM system 100b with an increased use wavelength, it is possible to perform communication superimposed on a single dark fiber, thereby reducing communication costs. Can do.

Furthermore, when a telecommunications carrier installs a wavelength division multiplexing communication device (PtP-WDM MUX) that incorporates the optical couplers 110 and 112 and performs wavelength multiplexing and optical wavelength conversion, the telecommunications carrier is provided with one for many users. It is possible to provide a communication service at a low cost using the above-described fiber.
In this case, the optical signal wavelength between the PtP and the WDM MUX is determined on the telecommunications carrier side. Therefore, it is possible to superimpose on another type of service (for example, the above-described service by FTTH).

  An example of the PtP-WDM system 100c using the PtP-WDM MUX as described above is shown in FIG. As shown in FIG. 7, in the PtP-WDM 100c, the wavelength division multiplexing communication device 204 is connected to the point A side of the optical transmission line (optical fiber) 200c, and the wavelength division multiplexing communication device 206 is connected to the point B side. These wavelength division multiplexing communication devices 204 and 206 are communication apparatuses installed by a communication carrier.

User A's communication devices 102 and 106 are connected to the wavelength multiplexing communication device 204, and similarly, user B and user C's communication devices (not shown) are connected by an optical fiber 202.
Further, the user A communication devices 104 and 108 are connected to the wavelength multiplexing communication device 206, and similarly, the user B and user C communication devices (not shown) are connected by the optical fiber 202. Wavelengths λ1 and λ2 are assigned to the communication device of user A, wavelength λ1 is assigned to the communication device of user B, and wavelength λ2 is assigned to the communication device of user C. These wavelengths λ1 and λ2 assigned to the users A, B, and C are converted into wavelength λx managed by the communication carrier by the wavelength division multiplexing communication devices 204 and 206, and transmitted through the optical transmission line 200c.

  As a conventional technique related to a system in which a PON system is superimposed on a PtP-WDM system, an optical access system disclosed in Patent Document 1 is known. In the optical access system disclosed in Patent Document 1, a WDM / TDM (Time Division Multiplexing) -PON overlay and a PtP WDM overlay are accommodated in the same transmission path. The optical access system disclosed in Patent Document 1 includes a station side transmission device (OLT), an optical transmission line, a subscriber terminal WDM / TDM-PON ONU group 1, and a mobile service terminal PtP WDM. It consists of ONU group 2. The OLT is a WDM / TDM-PON OLT unit that accommodates the ONU group 1, a PtP WDM OLT unit that accommodates the ONU group 2, and an optical multiplexing / demultiplexing unit that multiplexes and demultiplexes the upstream and downstream wavelengths that are converted to WDM. Consists of containers.

  The WDM / TDM-PON OLT unit is composed of a WDM / TDM-PON OLT port and a WDM / TDM-PON control circuit. The PtP WDM OLT unit includes a PtP WDM OLT port and a PtP WDM control circuit. The optical transmission path includes a power splitter, a single optical fiber that connects the power splitter and the OLT, and a plurality of optical fibers that connect the power splitter to the ONU group 1 and the ONU group 2. The interface portion between the OLT port and the optical transmission line of each ONU group includes an O / E converter (Optical signal / Electrical signal converter: a circuit that converts an optical signal into an electrical signal), or E An / O converter (Electrical signal / Optical signal converter: an electric / optical converter, a circuit that converts an electric signal into an optical signal) is provided.

JP, 2015-115717, A

  By the way, when a user directly borrows a dark fiber and uses it for point-to-point communication, the condition of the communication device to be connected oppositely is independent of the interface (physical) condition and frame format (logic) condition of the communication device. If they are the same, communication was possible. This is because the optical layer can be connected as it is without relaying or conversion.

  However, since the PtP-WDM system provided by the communication carrier needs to perform wavelength conversion and speed conversion, 3R (Resizing, Retiming, Identification Regenerating) processing is required. . On the other hand, in an optical transmission apparatus that receives an optical signal as input, performs predetermined processing, and outputs it as an optical signal, an O / E conversion unit-CDR unit (Clock Data Recovery) -E / O conversion It is common to have a configuration of parts.

  In this case, equalization in the 3R processing is performed by the O / E conversion unit, and retiming and identification / reproduction are performed by the CDR. This 3R processing unit is usually provided according to the range of the signal speed of the provided service. . This is because there is no clock recovery component that can follow signals of all speeds, or even if it exists, it becomes very expensive. Then, when a communication provider provides a PtP-WDM system, how to cope with signal rates of various services becomes one problem.

  Thus, it is conceivable as a proposal to set the signal speed range of the user communication device in the CDR unit in advance. Accordingly, there is a possibility that the CDR portion can be configured using inexpensive parts. In this case, from the viewpoint of the user, it is desired that the connection conditions be the same when using a service provided by a communication carrier and when using a dark fiber. That is, it is required not to depend on the signal speed of the client side (downstream side) and the uplink side (upstream side) and the protocol of the passing signal (that is, protocol free).

  On the other hand, in the PON system as shown in FIG. 5, the CDR function is provided in each of the OLT (intra-office device) and the ONU (in-home device). In the case of an ONU installed in a user's home, the CDR setting may be set by local construction, but it is not preferable from the viewpoint of cost increase accompanying an increase in setting man-hours. As an alternative, after communication with the OLT becomes possible, it is conceivable to set the ONU from the OLT using some communication means (for example, in-band method). In this case, it is a requirement not to assume the frame termination / generation function of a specific protocol from the above protocol-free condition. In this regard, in the optical access system disclosed in Patent Document 1, the setting of ONU is not particularly problematic.

  The present invention has been made in view of the above-described problems. It is an object of the present invention to enable a remote control to perform initial setting required for processing a signal of various speeds in a protocol-free manner in a point-to-point WDM apparatus that does not perform frame termination processing. It is an object of the present invention to provide a person-side terminal device, a station-side terminal device, a point-to-point optical communication system, and a program.

  In order to achieve the above-described object, a subscriber-side termination device according to the present invention is a subscriber-side termination device connected to a station-side termination device via an optical line, and receives from the station-side termination device. A clock signal recovery unit for recovering a clock signal from a signal, a request unit for requesting the station-side termination device to provide setting information of the clock signal recovery unit, and the setting information received from the station-side termination device, And a setting unit configured to set the clock signal reproduction unit.

  In order to achieve the above-described object, a station-side terminating device according to the present invention is a station-side terminating device connected to a subscriber-side terminating device via an optical line, and receives from the subscriber-side terminating device. When receiving a request from the clock signal regeneration unit for regenerating the clock signal from the signal and the subscriber-side termination device, the setting information of the clock signal regeneration unit of the subscriber-side termination device is transmitted to the subscriber-side termination device And a setting unit configured to set the clock signal reproducing unit according to the setting information.

  In order to achieve the above-described object, a point-to-point optical communication system according to the present invention includes the subscriber-side termination device and the station-side termination device, and the subscriber-side termination device. And one-to-one communication between the station-side terminal device.

  In order to achieve the above-described object, a program according to the present invention is connected to a station-side terminator via an optical line and reproduces a clock signal from a signal received from the station-side terminator. A requesting means for requesting the station-side terminator to provide setting information of the clock signal reproduction unit, and a program for performing setting processing of the subscriber-side terminator comprising: According to the setting information received from the termination device, the setting unit is configured to function as a setting unit that sets the clock signal reproduction unit.

  According to the present invention, in a point-to-point WDM apparatus that does not perform frame termination processing, it is possible to remotely perform initial settings necessary for processing signals of various speeds in a protocol-free manner. It is possible to provide a person-side terminal device, a station-side terminal device, a point-to-point type optical communication system, and a program.

It is a block diagram which shows an example of a structure of the PtP-WDM system which concerns on this Embodiment. It is a block diagram which shows an example of a structure of ONU which concerns on this Embodiment. It is a block diagram which shows an example of a structure of OLT which concerns on this Embodiment. It is a flowchart which shows the flow of a process of the initial setting process program which concerns on this Embodiment. It is a figure which shows the structure of the PON system which concerns on a prior art. It is a block diagram which shows an example of a structure of the PtP optical communication system using the dark fiber which concerns on a prior art, and a PtP-WDM system. It is a block diagram which shows the other example of a structure of the PtP-WDM system which concerns on a prior art. It is a block diagram which shows the structure of OLT and ONU which concern on a comparative example.

  Hereinafter, embodiments of the present invention will be described in detail with reference to FIGS. 1 to 4. In the present embodiment, a configuration in which each ONU is set from the OLT by an in-band method is adopted. In the present embodiment, the in-band method refers to a method of performing supervision control by superimposing the setting / control frame of the opposite station on the main line connected between the own station and the opposite station.

  A PtP-WDM system 1 according to the present embodiment will be described with reference to FIG. As shown in FIG. 1, the PtP-WDM system 1 includes an OLT 70 arranged on the uplink side and a plurality of ONUs 10 arranged on the client side (in FIG. 1, only two units of ONUs 10-1 and 10-2 are illustrated. However, it is arranged according to the number of clients, etc.). In the OLT 70, only a plurality of OSUs 50 (OSUs 50-1, 50-2, 50-3, and 50-4 are shown in FIG. 1), but the required number is arranged according to the number of clients. Is installed.

  The OLT 70 and each ONU 10 are connected by an optical transmission line 80 that includes an optical fiber. An optical splitter 82 is disposed in the optical transmission line 80. One optical fiber is connected between the OLT 70 and the optical splitter 82, and the optical splitter 82 and the ONU 10 are connected by optical fibers corresponding to the number of ONUs 10. Has been. On the other hand, the communication device 30 is connected to the upstream side of the OLT 70 by an optical fiber, and the communication device 32 is connected to the downstream side of the ONU 10 by an optical fiber.

  As shown in FIG. 1, each OSU 50 includes a downstream O / E converter 52, a CDR unit 54, an E / O converter 56, an upstream O / E converter 62, a CDR unit 60, and an E / O converter. A portion 58 is included. The communication device 30 is connected to the OSU 50 via the O / E conversion unit 52 and the E / O conversion unit 58. On the other hand, the E / O converter 56 and the O / E converter 62 are connected to an optical coupler 86 and are connected to an optical transmission line 80 via an optical coupler 84 (described later). Here, in the present embodiment, a direction from the OLT 70 toward the ONU 10 is referred to as a downward direction, and a direction from the OUN 10 toward the OLT 70 is referred to as an upward direction.

  The CDR unit 54 reproduces a clock signal and a data signal from the electrical signal received from the O / E conversion unit 52 and supplies the clock signal and the data signal to the OSU 50. On the other hand, the data signal generated by the OSU 50 is sent to the optical transmission line 80 via the E / O conversion unit 56. Similarly, the CDR unit 60 regenerates a clock signal and a data signal from the electrical signal received from the O / E conversion unit 62 and supplies it to the OSU 50. On the other hand, the data signal generated by the OSU 50 is sent to the communication device 30 via the E / O conversion unit 58.

  Each ONU 10 also includes a downstream O / E converter 12, a CDR unit 14, an E / O converter 16, an upstream O / E converter 22, a CDR unit 20, and an E / O converter 18. Yes. The E / O conversion unit 16 and the O / E conversion unit 22 are connected to a communication device 32. The O / E converter 12 and the E / O converter 18 are connected to the optical transmission line 80 via the optical coupler 88.

  The CDR unit 14 reproduces a clock signal and a data signal from the electrical signal received from the O / E conversion unit 12 and supplies the clock signal and the data signal to the ONU 10. On the other hand, the data signal generated by the ONU 10 is sent to the communication device 32 via the E / O conversion unit 16. Similarly, the CDR unit 20 regenerates a clock signal and a data signal from the electrical signal received from the O / E conversion unit 22 and supplies it to the ONU 10. On the other hand, the data signal generated by the ONU 10 is sent to the optical transmission line 80 via the E / O converter 18.

  The OLT 70 has a control unit (not shown) that performs overall control of the OLT 70, and the OSU 50 includes a control unit 64 that performs control within the OSU 50. Further, the ONU 10 includes a control unit 24 that performs control within the ONU. In the PtP-WDM system 1 having the above configuration, point-to-point communication is performed by a pair of each OSU 50 and ONU 10 connected in a one-to-one relationship.

  In the PtP-WDM system 1, the PON system 2 is further superimposed via the optical coupler 84. That is, the PON-OSU 34 that is the OSU for the PON system 2 is accommodated in the OLT 70 a for the PON system 2, and the PON-OSU 34 is connected to the optical transmission line 80 via the optical coupler 84. On the client side, a PON-ONU 36 that is an ONU for the PON system 2 is connected to the optical transmission line 80.

  By the way, in order to realize the setting of the ONU 10 by the in-band method, it is necessary to establish communication at a logical level between the OLT 70 and the ONU 10, but this realization method has one problem. Hereinafter, this problem will be described in more detail with reference to FIG. FIG. 8A shows an OLT 400 according to the comparative example, and FIG. 8B shows an ONU 500 according to the comparative example.

  In the downstream direction of the OSU 402 shown in FIG. 8A, as described above, the O / E conversion unit (optical interface unit) 404 connected to the uplink side performs optical / electrical conversion to reshape the signal. Do. Further, the CDR unit 406 regenerates the clock component from the reshaped signal, performs retiming and regeneration, and converts it to the line side (optical transmission line side) speed and optical signal (wavelength) to perform E / O conversion. It is sent from the unit 408 In the upstream direction, reverse conversion processing is performed.

  In this series of conversions, the control unit 416 needs to set the clock frequency range of the clock recovery circuit of the CDR units 406 and 412. This realizes a function of setting a speed range of an input signal in the CDR units 406 and 412 in order to receive signals of various speeds from the uplink side (speed free operation). Accordingly, initial setting information corresponding to the interface condition (signal speed) of the communication device to be connected is stored in a storage area such as a ROM (Read Only Memory) of the control unit 416 of the OSU 402. Since the OLT 400 is usually installed in a station of a communication carrier, the above setting is performed by, for example, Ethernet (registered trademark) communication from the operation system or the like.

  On the other hand, in the downstream direction of the ONU 500 shown in FIG. 8B, an optical signal received from the line side (optical transmission line side) is converted into an electrical signal by the O / E conversion unit 502, and then a clock signal and a data signal are converted by the CDR unit 504. Is transmitted from the E / O converter 506 at the speed and optical signal (wavelength) on the client side. In the upstream direction, the reverse process is performed. On the ONU 500 side as well, in order to cope with the speeds of various signals of a plurality of clients, it is necessary that the signal speed range of the entire client can be set by the control unit 514.

  However, unlike the OLT 400 installed in the station building, since the ONU 500 is installed in the user's house, this setting usually needs to be performed locally by a construction worker from the terminal. However, such a setting method has a problem in that on-site work occurs and the construction cost increases, and there is a restriction that it becomes difficult to make changes on the way.

Therefore, in this embodiment, an initial setting method using an in-band method is adopted.
In the OLT 400 and the ONU 500 according to the comparative example, as shown in FIG. 8, the conventional PtP-WDM MUX device does not have a frame termination function, and realizes one-to-one communication by processing in the physical (optical) layer. On the other hand, the ONU according to the present embodiment includes an initial setting unit (in this embodiment, a frame termination / generation function), activates the frame termination / generation function only at the time of initial setting, and performs initial setting processing. There is a feature in the point to do.

  The ONU and OLT according to the present embodiment will be described below with reference to FIGS. FIG. 2 shows an ONU according to the present embodiment, and FIG. 3 shows an OLT according to the present embodiment.

  As shown in FIG. 2, the ONU 10 according to the present embodiment is characterized in that it includes an initial setting unit 26 and a blocking unit 28 with respect to the ONU 500 according to the comparative example shown in FIG. As shown in FIG. 3, the basic configuration of the OLT 70 according to the present embodiment is the same as that of the OLT 400 according to the comparative example shown in FIG. 8A, but the communication function and the initial setting unit 26 of the ONU 26 It has a setting function (not shown).

  The initial setting unit 26 has a function for the ONU 10 to communicate with the OLT 70 and a function for performing various settings inside the ONU 10 in the initial setting. The method of communication between the ONU 10 and the OLT 70 is not particularly limited, and any of a communication method using a frame such as Ethernet (registered trademark), an original communication method including a synchronization bit and data, and the like may be used. In this embodiment, a mode using a frame such as Ethernet (registered trademark) will be described as an example.

  The initial setting unit 26 according to the present embodiment internally includes a frame termination function and a frame generation function, receives a data signal and a clock signal from the CDR 14 in the downstream direction, terminates the frame, and transmits the generated data signal to the upstream side. A direction signal is sent to the line side (optical transmission line 80 side) via the CDR 20 and the E / O conversion unit 18. The blocking unit 28 temporarily blocks upstream communication in the frame termination process.

With reference to FIG. 4, the initial setting process according to the present embodiment, that is, the initial setting process of the ONU 10 by the in-band method will be described. FIG. 4 is a flowchart showing a flow of processing of the initial setting processing program according to the present embodiment executed by the ONU 10, and this program is stored in a storage unit such as a ROM (not shown) included in the control unit 24, for example. Has been.
The initial setting process shown in FIG. 4 shows a process after the ONU 10 is installed in the user's home, an optical fiber and a power source are connected to the ONU 10, and the ONU 10 is turned on.
Note that after the ONU 10 is turned on, a voltage required for the operation of the ONU 10 is applied by power connection and the ONU 10 is activated in hardware, or a ROM (not shown) included in the control unit 24 of the ONU 10 After the predetermined firmware stored in the storage unit is read and the ONU 10 is activated by software.

  As shown in FIG. 4, when the power source is connected to the OUN 10 and the ONU 10 is turned on, first, in step S100, the default values of the parameters (clock frequency, etc.) of the CDRs 14 and 20 of the ONU 10 are set in the ONU 10. The data is read from a storage unit such as a ROM and set in the CDRs 14 and 20. This default value is a parameter value required for establishing downlink communication, and is commonly recognized on the OLT 70 side. The clock frequency in the default value is a clock frequency used for communication that triggers the initial setting, and is not particularly limited. For example, the clock frequency is set to the center value in the operating frequency range of the CDRs 14 and 20. Subsequent processing proceeds by autonomous processing by the ONU 10 or cooperation processing with the OLT 70.

  In the next step S102, the initial setting unit 26 is activated to turn on the frame termination / generation function, and the upstream main signal flowing from the client side is blocked by the blocking unit 28. The reason why the upstream main signal is blocked in this step is to prevent the transmission of the control frame for the initial setting in the upstream direction from being hindered.

In the next step S104, it is determined whether or not a downlink signal is received by the termination function unit of the initial setting unit 26. If the determination is affirmative, the process proceeds to step S108. If the determination is negative, the wavelength is changed in step S106, and then the process returns to step S104. In the PtP-WDM system, a wavelength is normally assigned to each ONU 10.
Therefore, in step 106, the reception wavelength of the O / E conversion unit 12 is swept (scanned) at predetermined wavelength intervals, and waits until a signal having a wavelength assigned to itself is received. If the received signal can be discriminated without changing the wavelength on the system, step S106 may be omitted.

  If reception is confirmed in step S104, the process waits until frame synchronization is established in step S108.

  If synchronization is established in step S108, an initial setting file download request is transmitted to the OLT 70 in step S110. The OLT 70 that has received the request transmits an initial setting file dedicated to the ONU 10 that has transmitted the request at a predetermined timing. An initial setting file dedicated to a specific ONU 10 is determined in advance based on a contract speed between a user of the ONU 10 and a carrier (communication carrier). Note that the contract speed of the user in the initial setting file is indicated not by the maximum contract bandwidth but by the physical communication speed. The method of determining the initial setting file is, for example, that the contract speed of 1 Kbps (bits per second) to 1 Mbps is the initial setting file A, the contract speed of 1 Mbps to 1 Gbps is the initial setting file B, and the contract speed of 1 Gbps to 10 Gbps is the initial setting file C. As described above, there is a method of determining in advance and automatically selecting a file to be downloaded based on a contract.

  In the next step S112, the ONU 10 downloads the initial setting file from the OLT 70, and stores the received initial setting file in a storage unit such as a non-volatile memory (not shown) in the control unit 24.

  In the next step S114, it is determined whether or not the received initial setting file is normal. The normality of the file stored in the nonvolatile memory or the like is confirmed by, for example, a parity check. If a negative determination is made in step S114, that is, if there is an abnormality in the initial setting file, the process returns to step S110 to transmit a download request to the OLT 70 and receive it again. If the determination in step S114 is affirmative, that is, if the initial setting file is normal, the process proceeds to step S116.

  In step S116, the OLT 70 is notified that the download of the initial setting file has been completed.

  In the next step S118, the frame termination / generation function by the initial setting unit 26 is turned off (stopped). At the same time, the blocking process of the upstream signal by the blocking unit 28 is turned off, and the upstream signal from the client side is passed.

In the next step S120, line-side signal setting (operation speed setting) is performed by controlling the E / O conversion unit 18 and the O / E conversion unit 12 (arrows (1) and (2) in FIG. 2).
Further, the settings of the CDRs 14 and 20 are changed (arrows (3) and (4) in FIG. 2), and it is confirmed that the settings are reflected normally, and the initial setting process is terminated. For example, whether or not the setting is correctly reflected is whether or not the control unit 24 has successfully written the initial setting file to the non-volatile memory and read the initial setting file from the non-volatile memory. You may carry out by determining.

  Here, the OLT 70 (OSU 50) having received the initial setting file download request signal from the ONU 10 in step S110 transmits the corresponding initial setting file to the ONU 10 and also performs its initial setting corresponding to the initial setting of the ONU 10, that is, , CDR 54 and 60 clock frequency range is set. The OLT 70 has a correspondence relationship between each ONU 10 and the initial setting file, for example, in the form of a table. The table is stored in a storage means such as a ROM (not shown) in the control unit of the OLT 70 as an example. Yes.

  In the ONU 10 according to the present embodiment, it is possible to constantly monitor reception of a frame by continuing to activate only the frame termination function. That is, the monitoring result by the frame termination function can be used as a trigger for starting the initial setting process according to the present embodiment. However, since the initial setting unit 26 is a circuit that is not normally used, it is generally desirable to set the sleep setting in order to reduce power consumption.

  Next, an operation mode associated with the initial setting process according to the present embodiment will be described. In the present embodiment, there are two operation modes based on the power off / on operation after the ONU 10 is operated.

  First, a basic operation mode in this embodiment will be described. In this operation mode, after the ONU 10 is turned on, the power is once turned off and then turned on again. The setting of the CDRs 14 and 20 is returned to the default value every time and the sequence for downloading the initial setting file from the OLT 70 is executed. To do. According to this sequence, when the service (contract) speed is changed, it is possible to respond only by turning the power on / off without exchanging the ONU 10. In the present embodiment, the above-described operation is referred to as an operation mode A, and the operation mode A is a basic operation when a power-off / on operation is executed.

  On the other hand, if the user does not need to change the service and the user wants to restore the communication in a short time when the power is turned off / on due to, for example, a momentary power interruption, the ONU 10 It is possible to store the initial setting file in the non-volatile memory and reset it when the power is turned on. In the present embodiment, this operation is referred to as operation mode B. With this configuration, communication can be restored for a short time. The operation mode B is particularly effective when a business user wants to shorten the service interruption time as much as possible. However, in the case of the operation mode B, when the service (contract) speed is changed, the ONU 10 needs to be replaced or a maintenance person visits.

It should be noted that in a certain ONU 10, whether the operation mode when the power is turned off / on is set to the operation mode A or the operation mode B is determined by, for example, individual setting of the ONU 10 at the time of device shipment or when the line is opened. In the individual setting of the ONU 10 in the installation work or the like, the ONU 10 may be determined by setting the operation mode A or the operation mode B.
Note that the setting of the operation mode to the ONU 10 may be performed, for example, by storing a definition file that defines the above-described operation mode A or operation mode B in a storage unit such as a ROM (not shown) included in the ONU 10. Further, as an example, each of the definition files defining the above two operation modes is stored in a storage unit such as a ROM (not shown) included in the ONU 10, and a dip switch or the like (not shown) is provided in the ONU 10 to change the switch value. Thus, which operation mode is to be executed may be set.
Further, the trigger for the ONU 10 to operate in either the operation mode A or the operation mode B is not limited to the case where the ONU 10 is powered on (powered on) from the stopped state (power off). When the ONU 10 shows the same behavior as when the power is turned on from the stop state when viewed from the OLT 70 side, for example, when the ONU 10 is reset while the power is on and is again activated by software. In addition, the operation for each operation mode described above can be executed.

  As described above in detail, in the subscriber-side termination device, station-side termination device, point-to-point type optical communication system, and program according to the present embodiment, in the PtP-WDM system having no frame termination function , The initial setting to the ONU can be performed remotely, thereby saving labor and cost. In addition, dispatching construction workers to the site increases the burden on the user and may reduce the motivation for service subscription. However, the subscriber-side termination device, station-side termination device, point-to- According to the point type optical communication system and the program, there is a possibility that such a decrease in user motivation can be suppressed. In recent years, there is a merit that precautions regarding connection and bending of optical fibers have been reduced, ONUs can be installed and connected relatively easily, and contact with a construction company and troublesome entry into a home are not required.

1 PtP-WDM system 2 PON system 10 ONU
12 O / E conversion unit 14 CDR unit 16 E / O conversion unit 18 E / O conversion unit 20 CDR unit 22 O / E conversion unit 24 Control unit 26 Initial setting unit 28 Blocking unit 30 Communication device 32 Communication device 34 PON-OSU
36 PON-ONU
50 OSU
52 O / E conversion unit 54 CDR unit 56 E / O conversion unit 58 E / O conversion unit 60 CDR unit 62 O / E conversion unit 64 Control unit 70, 70a OLT
80 Optical transmission path 82 Optical splitter 84 Optical coupler 86 Optical coupler 88 Optical coupler 100a PtP optical communication system 100b, 100c PtP-WDM system 102, 104, 106, 108 Communication equipment 110, 112 Optical coupler 200a, 200b Dark fiber 200c Optical transmission Path 204 wavelength division multiplexing communication device 206 wavelength division multiplexing communication device 250 PON system 252 OLT
254 Controller 256 OSU
258 ONU
260 Optical splitter 400 OLT
402 OSU
404 O / E conversion unit 406 CDR unit 408 E / O conversion unit 410 E / O conversion unit 412 CDR unit 414 O / E conversion unit 416 Control unit 500 ONU
502 O / E conversion unit 504 CDR unit 506 E / O conversion unit 508 E / O conversion unit 510 CDR unit 512 O / E conversion unit 514 Control unit

Claims (10)

A subscriber-side terminator connected to a station-side terminator via an optical line,
A clock signal reproduction unit for reproducing a clock signal from a signal received from the station-side terminal device;
A request unit that requests the station-side terminal device to provide setting information of the clock signal reproduction unit;
A setting unit configured to set the clock signal reproduction unit according to the setting information received from the station-side terminal device;
A subscriber-side terminating device comprising: The request unit requests the station-side terminal device to provide the setting information when the subscriber-side terminal device is activated.
The subscriber-side terminating device according to claim 1. The subscriber-side termination device is also connected to a predetermined device, and the clock signal reproduction unit reproduces a clock signal from a signal received from the predetermined device,
Further comprising a blocking unit that blocks a transmission path for transmitting a signal received from the predetermined device to the clock signal reproduction unit;
The request unit is after the activation of the subscriber-side termination device, and when the blocking unit blocks the transmission path, requests the station-side termination device to provide the setting information of the clock signal reproduction unit.
The subscriber-side terminating device according to claim 1 or 2, characterized in that The setting unit performs setting of the clock signal reproduction unit according to the setting information when the setting information is received and the blocking unit releases the blocking.
The subscriber-side terminating device according to claim 3. A storage unit that stores the setting information received from the station-side terminal device and definition information that defines an operation mode of the subscriber-side terminal device;
When the subscriber-side terminal device is restarted from a stopped state, according to the definition information stored in the storage unit,
Based on the setting information stored in the storage unit, an operation mode in which the setting of the clock signal reproduction unit is performed again,
And requesting the station-side terminal device to provide the setting information again, receiving the setting information, and performing any one of the operation modes for setting the clock signal reproduction unit. The subscriber-side terminating device according to any one of claims 1 to 4. The configuration information is information for designating any one of a plurality of predetermined ranges of physical communication speeds used for communication between the station-side terminal device and the subscriber-side terminal device. The subscriber-side terminating device according to any one of claims 1 to 5. A station-side terminator connected to a subscriber-side terminator via an optical line,
A clock signal reproducing unit for reproducing a clock signal from a signal received from the subscriber-side terminal device;
Upon receiving a request from the subscriber-side termination device, a transmission unit that transmits the setting information of the clock signal reproduction unit of the subscriber-side termination device to the subscriber-side termination device;
A setting unit configured to set the clock signal reproduction unit according to the setting information;
A station-side termination device comprising: The subscriber-side terminating device according to any one of claims 1 to 6,
A station-side terminal device according to claim 7,
A point-to-point type optical communication system, wherein one-to-one communication is performed between the subscriber-side terminal device and the station-side terminal device. A plurality of subscriber-side termination devices;
The optical line has one end connected to each of the plurality of subscriber-side terminators and the other end connected to an optical splitter, and one end connected to the station-side terminator and the other end connected to the optical fiber. The point-to-point type optical communication system according to claim 8, comprising an optical fiber connected to the splitter. A program for performing setting processing of a subscriber-side termination device that is connected to the station-side termination device via an optical line and includes a clock signal reproduction unit that reproduces a clock signal from a signal received from the station-side termination device Because
Computer
Request means for requesting the station side termination device to provide setting information of the clock signal reproduction unit, and
A program for functioning as a setting means for setting the clock signal reproduction unit according to the setting information received from the station-side terminal device.

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