JP5493681B2 - In-station apparatus, optical communication system, configuration detection method, and apparatus program - Google Patents

Description

  In the present invention, a subscriber unit (ONT: Optical Network Terminal / ONU; Optical Network Unit, hereinafter referred to as ONU) is connected to an intra-station device (OLT; Optical Line Termination) such as a PON (Passive Optical Network) system. The present invention relates to an intra-station apparatus, an optical communication system, a configuration detection method, and a program for the apparatus, which are used in an optical communication system configured to be connected via a network.

  ONU detection and connection processing in a general PON system using time division multiplexing represented by GE-PON (IEEE 802.3ah) and G-PON (ITU-T G984 series) will be described with reference to FIG. To do.

  First, the OLT transmits a unique identification information transmission instruction message to the ONU side as confirmation of ONU existence and connection processing (step S51).

  The ONU that has received the message performs reception processing and response preparation (step S52), and transmits a unique identification information response message to the OLT to the OLT (step S53). Since the OLT waits for a message from the ONU after sending the transmission instruction message to the ONU side, the OLT opens a message reception window based on the designated distance and is waiting for reception.

  If the OLT can receive the message within the message reception window, it indicates that the ONU exists within the specified connection distance, and can identify the ONU by the unique identification information obtained at the time of reception. it can. Further, one-to-one communication with any ONU is possible based on the unique identification information.

  In addition, there is one in which the station side device automatically establishes a communication path to the subscriber side device by giving a different identification number to each subscriber device by the station side device ( For example, see Patent Document 1).

JP 2000-13426 A

  However, the general ONU detection and connection process described above has the following problems as shown in FIG.

  First, if the actual connection distance between the OLT and the ONU (25 km in the example of FIG. 7) does not match the connection distance defined as an operational parameter (0 to 20 km in the example of FIG. 7), the above steps are performed. This means that the arrival of the unique identification information response message in S53 at the OLT and the message reception window by the OLT do not match, and the ONU cannot be detected and connected by the OLT.

  In other words, the specifications such as the connectable distance and the number of connected devices in the current PON system often exceed the specifications defined in standards such as ITU-T, so the above ONU detection and connection processing is automatically performed according to the standard definition. In order to operate the system to be processed, it is necessary for the operator to grasp and input the setting parameters such as the connection distance and the number in advance.

  If there is an error in the parameter setting such as the distance setting described above and there is an already connected ONU, the above ONU detection and connection processing is executed, thereby causing a communication error in the already connected ONU. There was a risk of it.

  Furthermore, if it is found after the start of operation that there is an error in the parameter setting such as the distance setting described above, it is necessary to restart in order to reset it, and if the environment is already connected to the ONU, the connection Processing was redone or communication was interrupted for a certain period. This is mainly because it is necessary to change the bandwidth allocation process for each ONU.

  In addition, the above-mentioned Patent Document 1 discloses automatic processing within a standard definition range such as measurement of transmission delay time and allocation of communication frame time slots, such as the connection distance to the ONU and the number of connected devices. However, it has not been considered to automatically acquire setting parameters whose current system capabilities exceed the definition of the standard.

  The present invention has been made in view of such circumstances, and is a system used to set parameters for automatic processing in a system that automatically processes detection and connection processing of subscriber devices in accordance with the definition of the standard. It is an object of the present invention to provide an intra-station apparatus, an optical communication system, a configuration detection method, and a program for the apparatus that can automatically acquire the configuration information.

  In order to achieve such an object, an intra-station device according to the present invention has a subscriber device connected to the intra-station device via a transmission line, and connects the subscriber device to the intra-station device by an automatic process defined in a standard. A subscriber unit connection means capable of connecting a subscriber unit up to a connection distance longer than a connection distance in automatic processing defined in the standard, which is an intra-station device used in a system having a function, and the subscriber unit The connection means includes configuration information acquisition means for acquiring configuration information of the system used for performing automatic processing defined in the standard.

  The optical communication system according to the present invention is characterized in that a subscriber unit is connected to the above-described intra-station apparatus according to the present invention via a transmission line.

  Further, the configuration detection method according to the present invention is a system having a function in which a subscriber unit is connected to an intra-station device via a transmission line, and the subscriber unit is connected to the intra-unit device by automatic processing defined in the standard. The intra-station apparatus comprises subscriber apparatus connection means capable of connecting a subscriber apparatus up to a connection distance longer than a connection distance in automatic processing defined in the standard, and the subscriber apparatus A maximum information acquisition step for acquiring maximum connection distance information that can be connected to the subscriber device by the subscriber device connection means from the connection means, and the subscriber device connection means used for performing automatic processing defined in the standard. A configuration information acquisition step for acquiring the configuration information of the system for each division distance range obtained by dividing the maximum connection distance acquired by the maximum information acquisition step into a predetermined number; Characterized by comprising a.

  In addition, the program of the in-station apparatus according to the present invention has a function of connecting the subscriber apparatus to the in-station apparatus through automatic processing defined in the standard, with the subscriber apparatus connected to the in-station apparatus via a transmission line. An in-station device program used in the system, the in-station device comprising subscriber device connection means capable of connecting the subscriber device to a connection distance longer than the connection distance in the automatic processing defined in the standard, A maximum information acquisition procedure for acquiring maximum connection distance information that can be connected to the subscriber device by the subscriber device connection means from the subscriber device connection means, and automatic processing defined in the standard by the subscriber device connection means. The system configuration information used for performing the acquisition is acquired for each divided distance range obtained by dividing the maximum connection distance acquired by the maximum information acquisition procedure into a predetermined number. A configuration information acquisition procedure, a is characterized by causing a computer to execute the above station device.

  As described above, according to the present invention, the system configuration information used for setting the parameters for automatic processing is automatically updated in the system that automatically processes the detection and connection processing of the subscriber device according to the definition of the standard. Can be obtained.

It is a block diagram which shows the structural example around a PON system as embodiment of this invention. It is a block diagram which shows the functional structure of the communication control part 11 of OLT1. It is a figure which shows the operation example of ONU detection and automatic connection by this embodiment. It is a figure which shows the example of a determination result in an automatic configuration process. It is a flowchart which shows the operation example of an automatic structure process. It is a figure explaining ONU detection and a connection process in a general PON system. It is a figure which shows the example of problem occurrence of ONU detection and connection processing in a general PON system.

Next, an embodiment in which an in-station apparatus, an optical communication system, a configuration detection method, and an apparatus program according to the present invention are applied to a PON system will be described in detail with reference to the drawings.
First, an outline of the present embodiment will be described.

  In this embodiment, for the OLT in the PON system, the OLT does not need to input in advance information such as the connection distance and the number of connected ONUs connected to the PON interface via a transmission path (such as an optical fiber). It is characterized in that configuration information can be collected and determined by As a result, the operational load on the operator can be greatly reduced.

Next, the configuration around the PON system according to the present embodiment will be described with reference to FIG.
The PON system according to the present embodiment includes an OLT 1 operated by a service provider and an ONU 4 used by a service user, and includes one optical fiber cable (1 PON interface) via a splitter (branching means) 3. ) A plurality of ONUs are connected on 2.

  The PON system according to the present embodiment has a long distance that is longer than the longest connection distance (20 km) or the distance difference (20 km) in the automatic processing defined in standards such as ITU-T and IEEE for the setting parameters such as the longest connection distance and distance difference. Up to setting and control is possible.

  The communication control unit 11 of the OLT 1 includes, as a physical layer configuration, an optical module 101 that transmits and receives optical signals to and from the ONU 4, a PON control chip 102 that performs communication control, and a CPU 103. In this way, the communication control unit 11 has a function of dynamically setting and controlling information necessary for ONU connection and capable of being executed dynamically.

  In general, an automatic connection function within the scope of the standard definition of acquiring unique identification information from an ONU and connecting the ONU has already been realized, but in recent years, the connectable distance to the ONU has been prolonged, The ability of the system is not able to fit within the conventional parameter definition and control range. For this reason, it has become a situation in which the system administrator or the like needs to know information in advance and input the missing parameters.

  In particular, distance information (range to be controlled) must be defined based on information according to the actual environment (most of which is the cable length from the OLT to the ONU), so the system administrator etc. before starting operation However, it was necessary to know a certain amount of accurate information, which was one of the causes of management operation load and response risk.

On the other hand, in this embodiment, the communication control unit 11 of the OLT 1 that controls each ONU connected on the PON interface obtains control information required for connection including recognition of operation hardware and connection distance information. Since it is set and executed autonomously, the operator only has to input the execution instruction.
The operator only needs to confirm the notified results and make changes based on the results if necessary, so the system can be operated without having to know the configuration environment in advance, operational load and setting errors, etc. Risk can be eliminated.

  Next, a functional configuration of the communication control unit 11 of the OLT 1 will be described with reference to FIG.

  The unique identification information acquisition function 12 confirms the existence of an ONU and acquires unique identification information defined for each ONU.

  The ONU connection / stop function 13 performs one-to-one communication between the OLT and the ONU using the acquired unique identification information, and measures RTT (Round Trip Time). Further, in order to eliminate the influence on other ONU detection and confirmation processing, control is performed such as temporarily stopping and resuming the ONU that has been confirmed.

  The optical module management function 14 determines whether or not the optical module 101 mounted on the OLT 1 is a target to be supported as a system operation by the OLT 1 and how much it has in transmitting and receiving data. . Moreover, if the optical module 101 is detachable from the OLT 1, it performs functions such as management.

  The distance change / calculation function 15 performs setting of distance information for detecting and confirming the ONU, calculation of the connection distance from the RTT obtained by the ONU connection processing, and data generation for the connection configuration.

  The received light level measurement function 16 measures the received light level from the connected ONU and determines whether or not stable operation is possible and how much connection is controllable.

  The alarm detection function 17 confirms the presence or absence of an alarm in PON interface units or individual ONU units.

  When the communication control unit 11 of the OLT 1 includes these functional units shown in FIG. 2 and receives an execution instruction from an operation system (OpS) 5 such as a PC that controls the OLT 1 (step S1), the communication control unit 11 receives the operation instruction. The instruction is executed by OLT-ONU communication performed through the PON interface of the OLT 1 (step S2), and the system configuration information obtained as a result is notified to the OpS 5 (step S3).

  Next, with reference to the example of FIG. 3, an example of operation for performing ONU detection and automatic connection using each function described above with reference to FIG. 2 will be described.

First, as HW (hardware) confirmation processing, the optical module management function 14 confirms a state such as whether or not the optical module 101 is connected to the OLT 1, and acquires information necessary for identification from the optical module 101.
In the example of FIG. 3, the result of the HW confirmation process indicates that the optical module 101 is supported as a system and communication up to 60 km is possible.

  As the configuration confirmation processing, first, the connectable distance range for detecting the ONU is divided into a predetermined number based on the result of the communication capability obtained by the HW confirmation processing. In the example of FIG. 3, it is illustrated that processing is performed by dividing a checkable range up to 60 km in units of 10 km into six check cycles.

  In the configuration confirmation process, ONU confirmation process is performed for each divided connection distance parameter. For each of the divided check cycles, as a configuration confirmation process, a unique identification information acquisition function 12, an ONU connection / stop function 13, a distance change / calculation function 15, a received light level measurement function 16, and an alarm detection function 17 in FIG. Processing is performed by combining the functions shown in “Example of functions used in check cycle”.

  An example of the result of processing in each check cycle is shown as “check cycle 1 processing result example” in FIG. The processing result in each check cycle is the number of ONUs detected in the connection distance range (0 to 10 km in the example of check cycle 1 in FIG. 3), the unique identification information of each ONU, the connection distance, and the light reception. It may include a level, presence / absence of an alarm, and the like.

  After completion of the configuration confirmation processing, the communication control unit 11 processes the system configuration information including the confirmation result in the HW confirmation processing and the check cycle processing result into a predetermined data format, and transmits the data to OpS5 to transmit the information of OpS5. Display on the screen. As a result, the operator can be notified of the results regarding the HLT configuration of the OLT 1 and what operation parameters are recommended.

  Next, an example of determination results in the automatic configuration processing of the system by performing the above-described HW confirmation processing and configuration confirmation processing will be described with reference to the example of FIG.

  In the example of FIG. 4, it is shown that the connection distance 10 km to 30 km is determined as the recommended operation value (recommended distance range) as the execution result of the check cycles 1 to 6 in the check cycle example divided into 6 by 10 km. (Judgment result 1).

The recommended operation value for this setting parameter is based on the number of connectable ONUs in each check cycle and can be connected within 20 km of the maximum distance range in which automatic connection processing defined in the standard can be performed. The communication control unit 11 calculates so that the number of existing devices becomes the maximum.
The designation of the connection distance range is shown as an example based on the above-described check cycle, and the division unit for designating the connection distance range may be an arbitrary number.

  If the recommended value of the operational distance range (recommended distance range), it indicates that a total of 20 ONUs can be operated at that time (judgment result 2).

  The communication control unit 11 transmits the recommended value of the operating distance range calculated in this way and the information on the number of ONUs in the recommended distance range to the OpS 5 by including the above-described system configuration information. For this reason, the operator can perform subsequent operations including the automatic processing defined in the standard by referring to and utilizing the determination result.

  Although the configuration of the embodiment has been described in detail above, the unique identification information acquisition process and the ONU connection process of FIG. 2 are well known to those skilled in the art and are not directly related to the present invention, so a detailed description thereof will not be given. Omitted.

  Next, the operation of the automatic configuration processing of the system by performing the above-described HW confirmation processing and configuration confirmation processing will be described with reference to the flowchart of FIG.

  First, when an operator performs an operation such as clicking an “automatic configuration execution” button on the display screen of OpS 5, an automatic configuration process execution instruction is transmitted from OpS 5 to the communication control unit 11. When receiving the execution instruction of the automatic configuration process, the communication control unit 11 checks the optical module 101 by the optical module management function 14 and acquires information for identification in order to check the HW state and communication capability of the OLT 1. (Optical module management processing; step S11).

  In order to perform stable operation, the communication control unit 11 sets a value obtained by adding a margin to the reception sensitivity information acquired from the optical module 101 in a predetermined area of the storage unit of the OLT as an upper threshold and a lower threshold for light reception level determination. (Step S12).

When the HW confirmation processing in steps S11 and S12 is thus performed, the configuration confirmation processing is sequentially performed for each check cycle described above.
First, as the control target distance setting, the communication control unit 11 sets the value of the connection distance range assigned to the check cycle for performing the configuration confirmation process (step S13). The determination process after setting (step S18) indicates that the test is terminated because the test cannot be continued if the set value is equal to or greater than the communication capability.

  As the unique identification information acquisition process, the communication control unit 11 performs confirmation of the presence / absence of ONU connection and information acquisition for subsequent processing (step S14). The unique identification information acquisition function 12 thus counts the number of ONUs existing in the check cycle to be confirmed by acquiring the unique identification information.

When the communication control unit 11 cannot receive the unique identification information, it means that there is no ONU within the designated connection distance range (including a connection problem), so the process proceeds to the next check cycle. .
Here, detailed description of re-execution processing when the unique identification information is acquired from a plurality of ONUs or cannot be acquired is omitted.

As the ONU connection processing, the communication control unit 11 makes a one-to-one connection with an ONU whose existence has been confirmed. At this time, the RTT value is acquired and the connection distance to each ONU is calculated based on the value (step S15). Here, when the variation in the RTT value exceeds a predetermined range, the alarm detection function 17 is notified as alarm information.
If the communication control unit 11 cannot connect to the ONU, it indicates that there is a problem on the environment or the ONT side. In this case, the connection is given up and the process proceeds to the next process.

  As the received light power level measurement process, the communication control unit 11 measures the level of the optical signal received from the connected ONU (step S16), and compares it with the upper and lower thresholds set in step S12. As a result of this comparison, if the light reception level does not fall between the upper threshold and the lower threshold, the alarm detection function 17 collects information as alarm information for the ONU.

  The comparison between the upper threshold and the lower threshold is based on the connection environment between the OLT and the ONU (for example, connector connection loss, branching loss due to the splitter, etc.). In some cases, it is used as an index for determining whether it is difficult to maintain a stable operation.

  As a result record, the communication control unit 11 individually records the result in the storage unit of the OLT after the processing from the ONU detection to the light reception power level is completed (step S17). Then, it is determined whether there is an ONU detection in the next check cycle or a check target at another connection distance, and a configuration check process by the next check cycle is executed, or the test ends (step S18).

  When the configuration confirmation processing in all the check cycles thus divided is completed, the communication control unit 11 can perform the automatic connection processing defined in the standard based on the number of ONUs counted in each check cycle. The recommended distance range for operating the system by automatic connection processing is calculated as in the example of FIG. 4 described above so that the number of ONUs that can be connected is maximized within 20 km.

  The communication control unit 11 predetermines the recommended value of the operating distance range calculated in this way and the information of the number of ONUs in the recommended distance range as the system configuration information together with the confirmation result and the check cycle processing result in the above-described HW confirmation processing. The data format is processed and transmitted to OpS5. The OpS 5 displays the received system configuration information on the display screen, whereby the operator can refer to and utilize the system configuration information.

As described above, according to the embodiment described above, the following effects can be obtained.
The first effect is that the communication control unit 11 of the OLT 1 autonomously confirms the HW configuration and capability, and performs processing within the capability range, so that it can be used even if the operator does not know the system in detail. .

  The second effect is that the communication control unit 11 of the OLT 1 can perform ONU detection processing up to the connectable distance within the determined processing capability range, and transmit system configuration information including the detection result to the OpS 5. For this reason, the operator does not need to have information about the installation environment in advance, and can obtain system configuration information used to set various parameters necessary for performing automatic processing defined in the standard. .

The third effect is that the communication control unit 11 of the OLT 1 measures the detected light reception power level of the ONU and collects various alarms by the automatic configuration process described above, and stores the system configuration information including the detection results in the OpS 5. In order to transmit, the system configuration information such as connection and installation environment can be grasped in advance by the operator before the system shifts to actual operation.
For this reason, it is possible to reduce the possibility of restarting for resetting during operation of the system, and a stable environment can be constructed.

As described above, in the above-described embodiment, the ONU detection and connection processing is automatically performed according to the standard definition (automatic configuration, automatic connection). It is possible for the communication control unit 11 of the OLT 1 to automatically acquire system configuration information including setting parameters exceeding.
For this reason, it is not necessary for the operator to prepare the setting parameter information for such automatic processing in advance, and the connection distance and the number of connected units to each ONU can be obtained simply by clicking the “automatic configuration execution” button on the display screen of OpS5. Such configuration information can be easily grasped. For this reason, the operation load of the system can be reduced.

  Since the system configuration information can be grasped in this way, the operator can set various parameters necessary for performing the automatic processing defined in the standard without preparing information in advance regarding the installation environment or the like.

Further, for example, when a problem occurs in the ONU, such as when the light reception level from the ONU does not fall within the range from the upper limit threshold to the lower limit threshold, the communication control unit 11 automatically acquires the fact of the problem as alarm information, Since the system configuration information including the alarm information is transmitted to the OpS 5, the operator can grasp the system configuration information including the alarm information before starting the operation of the system.
For this reason, it is possible to reduce the possibility of restarting for resetting during operation of the system, and a stable environment can be constructed.

  As described above, in the above-described embodiment, the communication control unit 11 of the OLT 1 has functions necessary for ONU connection and maintenance management and operates autonomously, so that there is no need to input parameters determined in advance by the operator. The system can be operated by automatically recognizing the configuration based on the hardware configuration and the installation environment.

  Further, it is possible to provide a fully automated function and system for ONU automatic connection and to grasp the state of the environment before operating in actual operation.

  Each of the above-described embodiments is a preferred embodiment of the present invention, and the present invention is not limited to this, and various modifications can be made based on the technical idea of the present invention.

  For example, in the example of FIG. 3 and FIG. 4 in the above-described embodiment, the connection distance division unit for detecting the ONU by OLT is assumed to be 10 km and divided into 6 check cycles. The division unit and the number of divisions of the range are not limited to this number as long as they are predetermined values, and may be any number.

  In addition, regarding the setting of the check cycle for performing the configuration confirmation processing, when the purpose is to confirm the presence / absence of the ONU and the confirmation of the connection configuration, the connection distance may not be divided and only one check cycle may be used. That is, in the example of FIGS. 3 and 4 described above, the target distance range of the check cycle may be set to 0 to 60 km, and the process may be performed once.

  Further, as the configuration confirmation processing, a processing flow may be assembled by combining a data error correction function and the like so that the state can be grasped in more detail.

  Further, for example, in the case of a system in which manufacturers of ONUs to be supported are limited, in the above-described embodiment, in the unique identification information acquisition process in step S14 of FIG. 5, information indicating ONUs that are not supported in the acquired unique identification information. May be excluded from the unit count, and the alarm detection function 17 may be notified as alarm information that the ONU is not supported.

  In addition, the automatic configuration processing in the above-described embodiment may be configured by omitting processing contents such as the light reception level measurement function 16 and the alarm detection function 17 according to the purpose and application.

  In the above-described embodiment, the example applied to the PON system has been described. However, the present invention is not limited to this example. For example, GE-PON (IEEE 802.3ah), G-PON (ITU-T G984 series), etc. The present invention can be similarly applied to all PON systems using the time division multiplexing method.

  Further, the PON system of the above-described embodiment has been described as a point-to-multipoint system configured by connecting a plurality of ONUs to the OLT. However, for example, a configuration in which one ONU is connected to the OLT is also possible. The present invention can be similarly applied.

In addition, by recording the processing procedure for realizing the OLT as the above-described embodiment on a recording medium as a program, the above-described functions according to each embodiment of the present invention can be performed by a program supplied from the recording medium. This can be realized by causing a CPU of a computer constituting the system to perform processing.
In this case, the present invention can be applied even when an information group including a program is supplied to the output device from the above recording medium or from an external recording medium via a network.
That is, the program code itself read from the recording medium realizes the novel function of the present invention, and the recording medium storing the program code and the signal read from the recording medium constitute the present invention. It will be.
As this recording medium, for example, flexible disk, hard disk, optical disk, magneto-optical disk, CD-ROM, CD-R, CD-RW, DVD-ROM, DVD-RAM, DVD-RW, DVD + RW, magnetic tape, non-volatile Sex memory cards, ROM, etc. may be used.

  According to the program according to the present invention, each function in the above-described embodiment can be realized in the OLT or PON system controlled by the program.

1 OLT (station equipment)
DESCRIPTION OF SYMBOLS 11 Communication control part 12 Unique identification information acquisition function 13 ONU connection / stop function 14 Optical module management function 15 Distance change / calculation function 16 Light reception level measurement function 17 Alarm detection function 2 Optical cable (transmission path)
3 Splitter
4 ONU (subscriber equipment)
5 OpS (operation display device)

Claims (17)

Used in a system having a function of connecting a subscriber device to the in-station device through an automatic process in which the subscriber device is connected to the in- station device via a transmission line and automatically connecting the subscriber device to the in-station device. An in-station device,
In connection possible distance run by the automatic processing, a subscriber device connection means capable of connecting the subscriber apparatus to the station apparatus,
Configuration information acquisition means for acquiring configuration information of the system used for performing the automatic processing for each division distance range obtained by dividing the connection distance into a predetermined number ,
The configuration information acquisition unit includes:
Among the connection distances, a recommended distance range is a distance range in which the number of subscriber devices that can be connected by the automatic processing is maximum based on the number of subscriber devices existing in the system counted for each divided distance range. station apparatus according to claim <br/> be calculated as. Maximum information acquisition means for acquiring maximum connection distance information that can be connected to the subscriber apparatus by the subscriber apparatus connection means from the subscriber apparatus connection means,
The configuration information acquisition unit acquires the configuration information of the system for each divided distance range obtained by dividing the maximum connection distance acquired by the maximum information acquisition unit into a predetermined number. The in-station device described. The configuration information acquisition means counts the number of subscriber devices existing in the system for each division distance range,
3. The intra-station apparatus according to claim 2, wherein the system configuration information includes information on the number of subscriber apparatuses for each division distance range. Used in a system having a function of connecting a subscriber device to the in-station device through an automatic process in which the subscriber device is connected to the in-station device via a transmission line and automatically connecting the subscriber device to the in-station device. An in-station device,
A subscriber unit connection means capable of connecting a subscriber unit to a connection distance longer than a connection distance in an automatic process for automatically connecting the subscriber unit to the intra-station device;
Configuration information acquisition means for acquiring configuration information of the system used for performing automatic processing in which the subscriber apparatus connection means automatically connects the subscriber apparatus to the intra-station apparatus;
Maximum information acquisition means for acquiring maximum connection distance information connectable to the subscriber device by the subscriber device connection means from the subscriber device connection means,
The configuration information acquisition unit includes:
Obtaining the configuration information of the system for each division distance range obtained by dividing the maximum connection distance obtained by the maximum information obtaining means into a predetermined number;
Count the number of subscriber devices present in the system for each division distance range;
Subscribers in the maximum distance range in which the subscriber device can be connected by automatic processing for automatically connecting the subscriber device to the intra-station device based on the information on the number of subscriber devices existing for each divided distance range Calculate the recommended distance range to maximize the number of devices present,
The system configuration information is
An intra-station device comprising information on the number of subscriber devices for each of the divided distance ranges and information on the recommended distance range. The configuration information acquisition means acquires alarm information about each subscriber unit existing in the system for each of the division distance ranges,
The in-station apparatus according to any one of claims 1 to 4, wherein the system configuration information includes alarm information for each subscriber apparatus.   6. The intra-station apparatus according to claim 1, further comprising a sending unit that sends the system configuration information acquired by the configuration information acquiring unit.   7. An optical communication system comprising a subscriber station connected to the intra-station apparatus according to claim 1 via a transmission line. Configuration in a system having a function of connecting a subscriber unit to an intra-station device via a transmission line, and connecting the subscriber unit to the intra-unit device by automatic processing for automatically connecting the subscriber unit to the intra-unit device A detection method,
The station apparatus, in the connection possible distance run by the automatic processing, comprises the subscriber device connection means capable of connecting the subscriber apparatus to the station apparatus,
A maximum information acquisition step of acquiring maximum connection distance information connectable to the subscriber device by the subscriber device connection means from the subscriber device connection means;
The configuration information of the system used for performing the automated processing, the configuration information acquisition step of acquiring each division distance range is divided into a defined number of acquired maximum connection distance was in advance by the maximum information acquisition step, equipped with a,
In the configuration information acquisition step, based on the number of subscriber devices existing in the system counted for each of the divided distance ranges, the number of subscriber devices connectable by the automatic processing is maximum. A distance detection range is calculated as a recommended distance range . In the configuration information acquisition step, the number of subscriber devices existing in the system is counted for each division distance range,
9. The configuration detection method according to claim 8, wherein the configuration information of the system includes information on the number of subscriber devices for each of the division distance ranges. Configuration in a system having a function of connecting a subscriber unit to an intra-station device via a transmission line, and connecting the subscriber unit to the intra-unit device by automatic processing for automatically connecting the subscriber unit to the intra-unit device A detection method,
The intra-station device comprises a subscriber unit connection means capable of connecting a subscriber unit up to a connection distance longer than a connection distance in an automatic process for automatically connecting the subscriber unit to the intra-station unit,
A maximum information acquisition step of acquiring maximum connection distance information connectable to the subscriber device by the subscriber device connection means from the subscriber device connection means;
The configuration information of the system used for the automatic processing for automatically connecting the subscriber unit to the intra-station device by the subscriber unit connection means, the maximum connection distance acquired by the maximum information acquisition step in advance A configuration information acquisition step for acquiring each division distance range divided into a predetermined number,
In the configuration information acquisition step,
In the configuration information acquisition step, the number of subscriber devices existing in the system is counted for each division distance range,
Subscribers in the maximum distance range in which the subscriber device can be connected by automatic processing for automatically connecting the subscriber device to the intra-station device based on the information on the number of subscriber devices existing for each divided distance range Calculate the recommended distance range to maximize the number of devices present,
The system configuration information is
A configuration detection method comprising information on the number of subscriber devices for each divided distance range and information on the recommended distance range. In the configuration information acquisition step, alarm information about each subscriber device existing in the system is acquired for each division distance range,
The configuration detection method according to claim 8, wherein the system configuration information includes alarm information about each subscriber device.   The configuration detection method according to claim 8, further comprising a sending step of sending the configuration information of the system acquired by the configuration information acquiring step. Used in a system having a function of connecting a subscriber device to the in-station device through an automatic process in which the subscriber device is connected to the in- station device via a transmission line and automatically connecting the subscriber device to the in-station device. An in-station device program,
The station apparatus, in the connection possible distance run by the automatic processing, comprises the subscriber device connection means capable of connecting the subscriber apparatus to the station apparatus,
Maximum information acquisition procedure for acquiring maximum connection distance information that can be connected to a subscriber device by the subscriber device connection means from the subscriber device connection means;
The subscriber unit connection means uses the maximum connection distance acquired by the maximum information acquisition procedure in advance as the system configuration information used to perform automatic processing for automatically connecting the subscriber unit to the intra-station device. A configuration information acquisition procedure for acquiring for each division distance range divided into a predetermined number, and causing the computer of the in-station device to execute ,
In the configuration information acquisition procedure, based on the number of subscriber devices existing in the system counted for each of the divided distance ranges, the number of subscriber devices connectable by the automatic processing is maximum. The distance range is calculated as a recommended distance range . In the configuration information acquisition procedure, the number of subscriber devices existing in the system is counted for each division distance range,
14. The in-station apparatus program according to claim 13, wherein the system configuration information includes information on the number of subscriber apparatuses for each division distance range. Used in a system having a function of connecting a subscriber device to the in-station device through an automatic process in which the subscriber device is connected to the in-station device via a transmission line and automatically connecting the subscriber device to the in-station device. An in-station device program,
The intra-station device comprises a subscriber unit connection means capable of connecting a subscriber unit up to a connection distance longer than a connection distance in an automatic process for automatically connecting the subscriber unit to the intra-station unit,
Maximum information acquisition procedure for acquiring maximum connection distance information that can be connected to a subscriber device by the subscriber device connection means from the subscriber device connection means;
The subscriber unit connection means uses the maximum connection distance acquired by the maximum information acquisition procedure in advance as the system configuration information used to perform automatic processing for automatically connecting the subscriber unit to the intra-station device. A configuration information acquisition procedure for acquiring for each division distance range divided into a predetermined number, and causing the computer of the in-station device to execute,
In the configuration information acquisition procedure,
Count the number of subscriber devices present in the system for each division distance range;
Subscribers in the maximum distance range in which the subscriber device can be connected by automatic processing for automatically connecting the subscriber device to the intra-station device based on the information on the number of subscriber devices existing for each divided distance range Calculate the recommended distance range to maximize the number of devices present,
The system configuration information is
An in-station device program comprising information on the number of subscriber devices for each of the divided distance ranges and information on the recommended distance ranges. In the configuration information acquisition procedure, alarm information about each subscriber unit existing in the system is acquired for each division distance range,
The in-station apparatus program according to any one of claims 13 to 15, wherein the system configuration information includes alarm information for each subscriber apparatus.   The in-station apparatus program according to any one of claims 13 to 16, which causes a computer of the in-station apparatus to execute a transmission procedure for transmitting the configuration information of the system acquired by the configuration information acquisition procedure. .

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