JP2017005385A - Station side device and connection scheme switching method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To allow a connection scheme to be switched between P-to-P connection and P-to-MP connection without causing communication interruption.SOLUTION: When connection is switched from P-to-P connection to P-to-MP connection, an ONU identifier necessary for TDM is registered in advance in the state of P-to-P connection, and an OLT 91 and an ONU 92 switch to P-to-MP connection at the same time. If the number of connections to the ONU 92 becomes one in the state of P-to-MP connection, they switch to P-to-P connection without continuing P-to-MP connection.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a station-side device and a subscriber-side device corresponding to operations at the time of switching between a point-to-point connection method and a point-to-multipoint connection method in a PON (Passive Optical Network) combined with time division multiplexing.

  FIG. 1 shows an example of TDM-PON using time division multiplexing (TDM) related to the present invention. Each subscriber unit (ONU) 92 is connected to a station side unit (OLT) 81 via an optical fiber transmission line 94 and an optical multiplexing / demultiplexing unit 93. Uplink signals from a plurality of ONUs 92 to the OLT 81 are assigned a fixed or dynamic band so that there is no temporal overlap. As a result, the OLT 81 realizes a point-to-multipoint (PtMP) connection that accommodates a plurality of ONUs 92.

  Currently, TDM-PON is widely used as an access network for services for mass users. On the other hand, for services for corporate users, etc., an access network in which the OLT 81 and the ONU 92 are connected in a one-to-one point-to-point (PtP) manner and does not use TDM is common. As described above, when a different access network is constructed for each service, an apparatus and an operation system are required for each access network, which increases costs. Therefore, Non-Patent Document 1 proposes that one OLT 81 accommodates a plurality of services in an access network using PON.

  In Non-Patent Document 2, WDM / TDM-PON is proposed as a PON system that realizes an access network capable of accommodating multiple services. In the WDM / TDM-PON system according to Non-Patent Document 2, wavelength division multiplexing (WDM) and TDM can be combined to accommodate different services for each wavelength. However, the OLT 81 needs to switch the connection with the ONU 92 to the PtMP connection when adding a user in a situation where a corporate user is accommodated with a PtP connection for a certain wavelength, for example. Similarly, in the case where only one user is used for a corporate user among the wavelengths accommodating mass users by PtMP connection, the OLT 81 needs to switch the connection with the ONU 92 to the PtP connection.

S. Kimura, “Elastic Lambda Aggregation Network (EλAN) —Proposal for Future Optical Access Network-,” OECC 2013, WP4-4, 2013 ITU-T G. 989.1

  When connecting the second and subsequent ONUs in a PON with PtP connection, it becomes a PtMP connection and it is necessary to apply TDM. When switching to TDM, the OLT disconnects the currently established communication, newly sends a registration request to each ONU, receives a registration response from the ONU, issues an ONU identifier, and each ONU registers the ONU identifier. As a result, communication is resumed. For this reason, when switching from the PtP connection to the PtMP connection, communication disconnection occurs.

  In addition, when the number of ONUs is reduced to one in a PON with a PtMP connection, the TDM continues and the control communication for allocating the bandwidth to the originally unnecessary ONU occurs. Waste occurs.

  Therefore, in the present invention, it is possible to switch the connection method from the PtP connection to the PtMP connection without causing a communication interruption, and to switch the connection method from the PtMP connection to the PtP connection in order to improve the bandwidth utilization efficiency. The goal is to enable automation.

  In order to achieve the above object, in the present invention, when switching from a PtP connection to a PtMP connection, an ONU identifier necessary for TDM is registered in advance in the PtP connection state, and the OLT and the ONU switch to the PtMP connection at the same time. Further, when the number of connections to the ONU becomes 1 in the PtMP connection state, the PtMP connection is switched to the PtP connection without continuing.

Specifically, the station side device according to the present invention is:
A station-side device connected to a plurality of subscriber-side devices,
An optical signal transmission / reception unit for transmitting / receiving an optical signal to / from one or more subscriber-side devices using time division multiplexing for one wavelength;
A connection method switching time calculating unit for calculating a connection method switching time for switching between a one-to-one and a one-to-many connection method in the subscriber side device;
The connection method switching time is notified to the subscriber side device together with the identifier of the subscriber side device for switching the connection method, and the connection method of the subscriber side device corresponding to the identifier is connected to the connection method switching time. A connection method control unit for switching between,
Is provided.

In the station side device according to the present invention,
The connection method control unit
Notifying the subscriber side device of a registration request including an identifier of the subscriber side device that performs connection mode switching and the connection mode switching time,
When a registration completion notification is received from the subscriber side device having the identifier of the subscriber side device, the connection method of the identifier of the subscriber side device may be switched during the connection mode switching time.

In the station side device according to the present invention,
The connection method switching time calculation unit
A time from when the station side device transmits the registration request to when the subscriber side device receives the registration request;
The time until the subscriber side device that has received the registration request registers the connection method switching time;
A time from when the subscriber-side device transmits a registration completion notification to when the station-side device receives the registration completion notification;
The connection method switching time may be calculated using.

Specifically, the connection method switching method of the station side device according to the present invention is:
A connection method switching method for a station-side device connected to a plurality of subscriber-side devices,
The optical signal transmission / reception unit transmits / receives an optical signal to / from one or a plurality of subscriber side devices using time division multiplexing for one wavelength, and the connection method switching time calculation unit is one-to-one in the subscriber side device. The connection method switching time for switching the one-to-many connection method is calculated, and the connection method control unit notifies the subscriber side device of the connection method switching time together with the identifier of the subscriber side device for switching the connection method. Connection method switching time notification procedure to
A connection method control unit, a connection method switching procedure for switching the connection method of the subscriber side device corresponding to the identifier at the connection method switching time;
Execute.

  According to the present invention, it is possible to switch the connection method from the PtP connection to the PtMP connection without causing a communication interruption, and to switch the connection method from the PtMP connection to the PtP connection in order to improve the bandwidth utilization efficiency. Automation can be enabled. For this reason, communication interruption when switching from PtP connection to PtMP connection can be avoided, switching of connection method can be realized without service interruption, and bandwidth usage is used when the number of connections to ONU becomes 1 in the state of PtMP connection Increase efficiency.

An example of the structure of TDM-PON using the time division multiplexing relevant to this invention is shown. An example of the station side apparatus which concerns on Embodiment 1 of this invention is shown. An example of the switching sequence from PtP connection to PtMP connection which concerns on Embodiment 1 of this invention is shown. An example of the flowchart of OLT91 is shown among the switching flowcharts from PtP connection to PtMP connection which concern on Embodiment 1 of this invention. An example of the flowchart of ONU92 is shown among the switching flowcharts from PtP connection to PtMP connection which concern on Embodiment 1 of this invention. An example of the switching sequence from PtP connection to PtMP connection which concerns on Embodiment 2 of this invention is shown. An example of the flowchart of OLT91 is shown among the switching flowcharts from PtP connection to PtMP connection which concern on Embodiment 2 of this invention. An example of the flowchart of ONU92 is shown among the switching flowcharts from PtP connection to PtMP connection which concern on Embodiment 2 of this invention. An example of the switching sequence from PtP connection to PtMP connection which concerns on Embodiment 3 of this invention is shown. An example of the flowchart of OLT91 is shown among the switching flowcharts from PtP connection to PtMP connection which concern on Embodiment 3 of this invention. The 1st example of the flowchart of ONU92 is shown among the switching flowcharts from PtP connection to PtMP connection which concern on Embodiment 2 of this invention. The 2nd example of the flowchart of ONU92 is shown among the switching flowcharts from PtP connection to PtMP connection which concern on Embodiment 2 of this invention.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In addition, this invention is not limited to embodiment shown below. These embodiments are merely examples, and the present invention can be implemented in various modifications and improvements based on the knowledge of those skilled in the art. In the present specification and drawings, the same reference numerals denote the same components.

(Embodiment 1)
(Embodiment of station side device (OLT))
FIG. 2 shows an example of the station side device (OLT) 91 in the present embodiment. The OLT 91 according to this embodiment includes a signal transmission / reception unit 11, a bandwidth allocation calculation unit 12, a transmission permission transmission unit 13, a registered ONU management unit 14, a connection method switching time calculation unit 15, and a connection method control unit 16. Prepare.

  The signal transmission / reception unit 11 transmits / receives an optical signal to / from the subscriber unit (ONU) 92 via the optical fiber transmission line 94 and the optical multiplexing / demultiplexing unit 93. The signal transmission / reception unit 11 transmits / receives an optical signal to / from one or more ONUs 92 using time division multiplexing for one wavelength. The bandwidth allocation calculation unit 12 calculates the transmission time Ts of the optical signal from each ONU 92 to the OLT 91 for the ONU identifier recorded in the registered ONU management unit 14. Here, the transmission time Ts includes information on the timing for starting transmission and the time width for continuing transmission. The timing for starting transmission is, for example, time or period. The time width for continuing the transmission is, for example, a transmission duration or a period.

  The transmission permission transmission unit 13 instructs the ONU 92 on the transmission time Ts calculated by the bandwidth allocation calculation unit 12. The registered ONU management unit 14 assigns and records an ONU identifier to each ONU 92 connected to the OLT 91 or deletes the recorded ONU identifier.

  The connection method switching time calculation unit 15 calculates the connection method switching time when the connection method between the OLT 91 and the ONU 92 is switched. The connection method control unit 16 controls a connection method switching sequence between the OLT 91 and the ONU 92.

(Switching operation from PtP connection to PtMP connection)
FIG. 3 shows a switching sequence from the PtP connection method to the PtMP connection method in the present embodiment. 4 and 5 show examples of flowcharts executed by the OLT 91 and the ONU 92 in the present embodiment. In the present embodiment, when the ONT 92 # 2 is added to the connection with the OLT 91 while the OLT 91 and the ONU 92 # 1 are connected by the PtP connection method, the OLT 91 and the ONU 92 # 1 execute the following sequence.

  The connection method switching method of the OLT 91 according to the present embodiment sequentially executes a connection method switching time notification procedure and a connection method switching procedure. In the connection method switching time notification procedure, the OLT 91 executes steps S101 to S108. In the connection method switching procedure, the OLT 91 executes steps S109 to S113.

When the connection method control unit 16 starts a switching sequence from the PtP connection method to the PtMP connection method (S101), the connection method control unit 16 sets the number of switching attempts n to 1 (S102).
(1) The connection method control unit 16 confirms that the connection method of the OLT 91 is the PtP connection method (Yes in S103), and the connection method switching time calculation unit 15 sets the connection method switching time Tc for switching to the PtMP connection method. Calculate (S104). Here, the connection method switching time Tc includes information on timing for starting switching. The timing for starting the switching is, for example, a time or a cycle.

  The connection method switching time calculation unit 15 sets the connection method switching time Tc to the PtMP connection method from the current time t until the ONU 92 # 1 receives the notification of the connection method switching time Tc from the OLT 91, and the ONU 92 performs the OLT 91. The connection method switching time Tc received from the time when the OLT 91 receives the registration completion notification from the ONU 92 and the time obtained by the sum of the time required to register is calculated. When the connection method of the OLT 91 is not the PtP connection method (No in S103), the connection method control unit 16 ends this sequence.

(2) The registered ONU management unit 14 assigns an ONU identifier to the ONU 92 # 1 to which the OLT 91 is currently connected and registers it (S105).
(3) The signal transmission / reception unit 11 transmits the connection method switching time Tc and the ONU identifier obtained from (1) and (2) to the connected ONU 92 # 1 (S106).

  The connection method control unit 16 adds 1 to the number of switching attempts n (S107). If the switching trial count n is less than the switching trial upper limit count m (Yes in S108), the connection method control unit 16 waits for a reply from the ONU 92 (S109). If the switching trial count n is greater than or equal to the switching trial upper limit count m (No in S108), the connection method control unit 16 ends this sequence.

  If the reply from the ONU 92 # 1 has not been received (No in S109), the connection method control unit 16 waits for a predetermined waiting time s (S121). The connection method control unit 16 waits for a reply from the ONU 92 # 1 until the current time t exceeds the connection method switching time Tc (Yes in S122). When the current time t exceeds the connection method switching time Tc (No in S122), the connection method control unit 16 ends this sequence.

  (4) When the ONU 92 # 1 receives the registration request for the ONU identifier and the connection method switching time Tc from the OLT 91, the ONU 92 # 1 starts a switching sequence from the PtP connection method to the PtMP connection method (S131). The ONU 92 # 1 confirms that the received connection method switching time Tc is later than the current time t held by the ONU 92 # 1 (Yes in S132), and registers the connection method switching time Tc and the ONU identifier ( (S133), a registration completion notification is transmitted to the OLT 91 (S134).

  When the reply from the ONU 92 # 1 is a registration completion notification (Yes in S110), the connection method control unit 16 confirms that the current time t is before the connection method switching time Tc (Yes in S111). Wait until the current time t reaches the connection method switching time Tc (S112). If the current time t is later than the connection method switching time Tc (No in S111), the connection method control unit 16 proceeds to S103.

  When the connection method switching time Tc received by the ONU 92 # 1 is before the current time t held by the ONU 92 # 1 (No in S132), the ONU 92 # 1 notifies the connection method switching time Tc of registration failure notification. It transmits to OLT91 (S137). When the connection method control unit 16 receives a registration failure notification of the connection method switching time Tc from the ONU 92 # 1 (No in S110), the connection method control unit 16 proceeds to S103.

  (5) The connection method control unit 16 that has received the registration completion notification from the ONU 92 # 1 waits until the connection method switching time Tc (S112), and switches to the PtMP connection method at the connection method switching time Tc (S113). . The ONU 92 # 1 waits until the connection method switching time Tc (S135), and switches to the PtMP connection method at the connection method switching time Tc (S136).

  (6) When the ONU 92 # 1 cannot register the connection method switching time Tc and repeats the sequence (1) to (6) by a predetermined switching trial upper limit number m, this sequence is finished. (No in S108).

  In this embodiment, when the OLT 91 switches from the PtP connection to the PtMP connection, the ONU identifier necessary for the TDM is registered in advance in the PtP connection state, and the OLT 91 and the ONU 92 switch from the PtP connection to the PtMP connection at the same time. For this reason, communication disconnection can be avoided, and switching of connection methods can be realized without service interruption.

(Embodiment 2)
(Switching operation from PtMP connection to PtP connection 1)
FIG. 6 shows a switching sequence from the PtMP connection method to the PtP connection method when the number of connection ONUs 92 decreases from a plurality to one in the present embodiment. 7 and 8 show examples of flowcharts executed by the OLT 91 and the ONU 92 # 1 in the present embodiment. In a state where the OLT 91 and the ONU 92 # 1 and the ONU 92 # 2 are connected by the PtMP connection method, when the ONU 92 # 2 is deleted, the OLT 91 and the ONU 92 # 1 execute the following sequence.

  The connection method switching method of the OLT 91 according to the present embodiment sequentially executes a connection method switching time notification procedure and a connection method switching procedure. In the connection method switching time notification procedure, the OLT 91 executes steps S201 to S208. In the connection method switching procedure, the OLT 91 executes steps S209 to S212.

  (1) The connection method control unit 16 confirms that there is one ONU identifier recorded in the registered ONU management unit 14 (S201). The connection method control unit 16 sets the number of switching attempts n to 1 (S202).

  (2) The connection method control unit 16 confirms that the connection method of the OLT 91 is the PtMP connection method (Yes in S203), and the connection method switching time calculation unit 15 selects the connection method switching time Tc for switching to the PtP connection method and An ONU identifier deletion time Td for deleting the ONU identifier is calculated (S204). If the connection method of the OLT 91 is not the PtMP connection method (No in S203), the connection method control unit 16 ends this sequence.

  Here, the ONU identifier deletion time Td includes information on timing for deleting the ONU identifier. The timing for deleting the ONU identifier is, for example, time or period. The timing for deleting the ONU identifier is, for example, at the same time as the connection method switching time Tc or after the connection method is switched. When the connection method switching is completed, a time when a predetermined time has elapsed in the connection method switching time Tc is set as an ONU identifier deletion time Td. In the present embodiment, the case where the ONU identifier deletion time Td is the same as the connection method switching time Tc, that is, T = Tc = Td will be described.

  (3) The signal transmission / reception unit 11 transmits the connection method switching time Tc and the ONU identifier deletion time Td obtained in (2) to the connected ONU 92 # 1 (S205). The connection method control unit 16 adds 1 to the switching trial count n (S206).

  (4) When receiving the connection method switching time Tc and the ONU identifier deletion time Td from the OLT 91, the ONU 92 # 1 starts a sequence (S231). The ONU 92 # 1 confirms that the received connection method switching time Tc and ONU identifier deletion time Td are later than the current time t held by the ONU 92 # 1 (Yes in S232).

  When the connection method switching time Tc and the ONU identifier deletion time Td are before the current time t (Yes in S232), the ONU 92 # 1 registers the connection method switching time Tc and the ONU identifier deletion time Td (S233). A registration completion notification is transmitted to the OLT 91 (S234). Then, the ONU 92 # 1 waits until the connection method switching time Tc and the ONU identifier deletion time Td (S235), and at the connection method switching time Tc and the ONU identifier deletion time Td, switching to the PtP connection method and deletion of the ONU identifier are performed. Implement (S236).

  If the connection method switching time Tc and the ONU identifier deletion time Td are earlier than the current time t (Yes in S232), the ONU 92 # 1 notifies the OLT 91 that the connection method switching time Tc and the ONU identifier deletion time Td cannot be registered. (S241).

  If the switching trial count n is less than the switching trial upper limit count m (Yes in S207) and no reply has been received from the ONU 92 # 1 (No in S208), the connection method control unit 16 performs only a predetermined waiting time s. Wait (S221). Here, the waiting time s is not limited to time but may be a period. The connection method control unit 16 waits for a reply from the ONU 92 # 1 until the current time t exceeds the connection method switching time Tc (Yes in S222). When the current time t exceeds the connection method switching time Tc (No in S222), the connection method control unit 16 ends this sequence.

(5) When the OLT 91 receives a registration completion notification (Yes in S209), the connection method control unit 16 confirms that the current time t is before the connection method switching time Tc and the ONU identifier deletion time Td ( S210).
When the current time t is before the connection method switching time Tc and the ONU identifier deletion time Td (Yes in S210), the connection method control unit 16 waits until the connection method switching time and the ONU identifier deletion time Td (S211). The connection method switching between the OLT 91 and the ONU 92 is switched to the PtP connection method and the ONU identifier is deleted at the connection method switching time Tc and the ONU identifier deletion time Td (S212).
When the current time t is later than the connection method switching time Tc and the ONU identifier deletion time Td (No in S210), the connection method control unit 16 confirms again that the connection method of the OLT 91 is the PtMP connection method ( The connection method switching time calculation unit 15 calculates the connection method switching time Tc for switching to the PtP connection method and the ONU identifier deletion time Td for deleting the ONU identifier (S204).
When the OLT 91 receives a registration failure notification (No in S209), the process proceeds to step S203.

  (6) When the ONU 92 # 1 cannot register the connection method switching time Tc and the ONU identifier deletion time Td and repeats steps S203 to S205 for a predetermined switching trial upper limit number m (No in S207), The connection method control unit 16 ends this sequence.

  In the present embodiment, the OLT 91 switches to the PtP connection without continuing the PtMP connection when the connection between the OLT 91 and the ONU 92 is a PtMP connection and the number of connections of the ONU 92 to the OLT 91 is one. For this reason, control communication for bandwidth allocation required by TDM at the time of PtMP connection becomes unnecessary, and improvement in bandwidth utilization efficiency can be realized.

(Embodiment 3)
(Switching operation from PtMP connection to PtP connection 2)
FIG. 9 shows a switching sequence from the PtMP connection method to the PtP connection method when there are a plurality of connection ONUs 92 in this embodiment. 10 to 12 show examples of flowcharts executed by the OLT 91 and the ONU 92 in the present embodiment. In a state where the OLT 91 and the ONU 92 # 1 to ONU92 # N are connected by the PtMP connection method, when the connection method control unit 16 instructs to select the ONU 92 # 1 and the PtP connection method, the OLT 91 and the ONU 92 # 1 to ONU92 # N performs the following sequence: Also in the present embodiment, as in the second embodiment, the case where the ONU identifier deletion time Td is the same as the connection method switching time Tc, that is, T = Tc = Td will be described.

  The connection method switching method of the OLT 91 according to the present embodiment sequentially executes a connection method switching time notification procedure and a connection method switching procedure. In the connection method switching time notification procedure, the OLT 91 executes steps S301 to S309. In the connection method switching procedure, the OLT 91 executes steps S310 to S314.

  (1) When starting the sequence (S301), the connection method control unit 16 sets the number of switching attempts n to 1 (S302). When the connection method control unit 16 confirms that the connection method of the OLT 91 is the PtMP connection method (Yes in S303), the connection method switching time calculation unit 15 performs the connection method switching time Tc and the ONU identifier deletion time Td for the ONU 92 # 1. And ONU identifier deletion time Td for ONU92 # 2 to ONU92 # N is calculated (S304). If the connection method of the OLT 91 is not the PtMP connection method (No in S303), the connection method control unit 16 ends this sequence.

  (2) The signal transmitting / receiving unit 11 transmits the connection method switching time Tc and the ONU identifier deletion time Td obtained in (1) to the ONU 92 # 1 connected to the OLT 91 (S305), and the ONU identifier deletion time Td is transmitted. It transmits to ONU92 # 2-ONU92 # N (S306, S307).

  (3) When receiving the connection method switching time Tc and the ONU identifier deletion time Td from the OLT 91, the ONU 92 # 1 starts a sequence (S331). The ONU 92 # 1 confirms that the connection method switching time Tc and the ONU identifier deletion time Td to the received PtP connection method are later than the current time t held by the ONU 92 # 1 (Yes in S332), and PtP The connection method switching time Tc to the connection method and the ONU identifier deletion time Td are registered (S333), and a registration completion notification is transmitted to the OLT 91 (S334).

  The ONU 92 # 1 waits until the connection method switching time Tc to the PtP connection method and the ONU identifier deletion switching time Td (S335), and enters the PtP connection method at the connection method switching time Tc to the PtP connection method and the ONU identifier deletion time Td. And deletion of the ONU identifier are performed (S336). When the connection method switching time Tc to the PtP connection method and the ONU identifier deletion time Td are before the current time t held by the ONU 92 # 1 (No in S332), the ONU 92 # 1 is connected to the PtP connection method. A registration impossible notification of the connection method switching time Tc and the ONU identifier deletion time Td is transmitted to the OLT 91 (S341).

  ONU92 # 2-ONU92 # N will start a sequence, if ONU identifier deletion time Td is received from OLT91 (S351). The ONU 92 # 2-ONU92 # N confirms that the received ONU identifier deletion time Td is later than the current time t held by the ONU 92 # 2-ONU92 # N (Yes in S352), and the ONU identifier deletion time Td is registered (S353), a registration completion notification is transmitted to the OLT 91 (S354), waits until the ONU identifier deletion time Td (S355), and the ONU identifier is deleted at the ONU identifier deletion time Td (S356). If the ONU identifier deletion time is earlier than the current time t held by the ONU 92 # 2 to ONU92 # N (No in S352), a registration failure notification of the ONU identifier deletion time Td is transmitted to the OLT 91 (S357).

  (4) The connection method control unit 16 that has received the registration completion notification (Yes in S310) does not receive the registration failure notification (Yes in S311), and the current time t does not exceed the connection method switching time Tc. (Yes in S312), wait until the connection method switching time Tc to the PtP connection method and the ONU identifier deletion time Td (S313), and switch to the PtP connection method at the connection method switching time Tc to the PtP connection method and the ONU identifier deletion time Td. Is switched (S314). The connection method control unit 16 that has received the registration failure notification from at least one ONU 92 (No in S311) shifts to the sequence (1).

  (5) The ONU 92 # 1 cannot register the connection method switching time Tc and the ONU identifier deletion time Td to the PtP connection method, or the ONU identifier deletion time cannot be registered in any one of the ONU 92 # 2 to ONU 92 # N. When the sequence of (1) to (5) is repeated for a predetermined switching trial upper limit number m (No in S309), this sequence is terminated.

  In this embodiment, the OLT 91 switches to a PtP connection without continuing the PtMP connection when the OLT 91 performs a connection with only a specific ONU 92 while the connection between the OLT 91 and the ONU 92 is a PtMP connection. For this reason, control communication for bandwidth allocation required by TDM at the time of PtMP connection becomes unnecessary, and improvement in bandwidth utilization efficiency can be realized.

  The first to third embodiments can be realized by using, for example, NG-PON2, 10G-EPON, GE-PON, XG-PON, and G-PON as the PON using TDM.

  The station side apparatus and connection method switching method of the present invention can be applied to the information communication industry.

11: Signal transmission / reception unit 12: Bandwidth allocation calculation unit 13: Transmission permission transmission unit 14: Registration ONU management unit 15: Connection method switching time calculation unit 16: Connection method control unit 81: OLT
91: OLT
92: ONU
93: Optical multiplexing / demultiplexing unit 94: Optical fiber transmission line

Claims (4)

A station-side device connected to a plurality of subscriber-side devices,
An optical signal transmission / reception unit for transmitting / receiving an optical signal to / from one or more subscriber-side devices using time division multiplexing for one wavelength;
A connection method switching time calculating unit for calculating a connection method switching time for switching between a one-to-one and a one-to-many connection method in the subscriber side device;
The connection method switching time is notified to the subscriber side device together with the identifier of the subscriber side device for switching the connection method, and the connection method of the subscriber side device corresponding to the identifier is connected to the connection method switching time. A connection method control unit for switching between,
A station side device comprising: The connection method control unit
Notifying the subscriber side device of a registration request including an identifier of the subscriber side device that performs connection mode switching and the connection mode switching time,
When a registration completion notification is received from the subscriber side device having the identifier of the subscriber side device, the connection method of the identifier of the subscriber side device is switched during the connection method switching time.
The station side apparatus of Claim 1. The connection method switching time calculation unit
A time from when the station side device transmits the registration request to when the subscriber side device receives the registration request;
The time until the subscriber side device that has received the registration request registers the connection method switching time;
A time from when the subscriber-side device transmits a registration completion notification to when the station-side device receives the registration completion notification;
The connection method switching time is calculated using
The station side apparatus of Claim 1 or 2. A connection method switching method for a station-side device connected to a plurality of subscriber-side devices,
The optical signal transmission / reception unit transmits / receives an optical signal to / from one or a plurality of subscriber side devices using time division multiplexing for one wavelength, and the connection method switching time calculation unit is one-to-one in the subscriber side device The connection method switching time for switching the one-to-many connection method is calculated, and the connection method control unit notifies the subscriber side device of the connection method switching time together with the identifier of the subscriber side device for switching the connection method. Connection method switching time notification procedure to
A connection method control unit, a connection method switching procedure for switching the connection method of the subscriber side device corresponding to the identifier at the connection method switching time;
The connection method switching method of the station side device that executes

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