JP2018182414A - Station side device, optical communication unit, protection method for station side device, and control method for station side device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To execute protection of a plurality of types of optical communication units having different communication systems even when adopting an optical switch having one standby port.SOLUTION: A station side device comprises: an optical switch having a plurality of active ports and one standby port; a plurality of types of active units having different communication systems as optical communication units optically connected to the active ports; a standby unit capable of corresponding to the plurality of types of communication systems as an optical communication unit optically connected to the standby port; and a control part for executing protection including first control for connecting the standby port to the active port of a switching source and second control to operate the standby unit by the communication system of the active unit of the switching source.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a station-side device, an optical communication unit, a protection method for the station-side device, and a control method for the station-side device.

In PON (Passive Optical Network), an optical line termination unit (OSU) on the station side and a plurality of optical line termination units (ONUs) on the home side are connected by a PON line branched by a passive optical branch node such as an optical splitter. It is a communication system.
In PON, since the OSU and a plurality of ONUs share the PON circuit, if the communication service is stopped due to the disconnection of the optical fiber or the failure of the OSU, the influence affects many subscribers. Therefore, in order to stabilize the communication service, it is important to make the OSU and PON lines redundant.

Making some or all of the components of the communication device redundant or switching redundant components is called "protection". There are various methods for this.
For example, Patent Documents 1 to 3 describe OLT (Optical Line Terminal) of PON which is a redundant configuration having an extra OSU. The OLT appropriately controls the switching timing of the optical switch and the transmission timing of each ONU during the switching period to the redundant OSU, thereby preventing a momentary loss of communication associated with the protection.

JP 2007-147801 A JP, 2014-068213, A JP, 2016-025575, A

In the above-mentioned station-side apparatus, in addition to the OSU that performs PON communication, an apparatus configuration that allows an optical communication unit (for example, a digital RoF BBU to be described later) adopting a communication method other than PON to coexist inside a housing May be adopted.
In this case, if an optical switch of the N + 1 line switching type is adopted, only one type of optical communication unit of the OSU or BBU can be connected to the (N + 1) th spare port, so only one of the currently used OSU and BBU operates. I can not guarantee.

As a solution to this problem, it is conceivable to adopt an optical switch having a plurality of spare ports, and to connect redundant OSUs and redundant BBUs to these spare ports.
However, since the optical switch having a plurality of spare ports is not a general-purpose product and expensive, there is a disadvantage that the manufacturing cost of the station-side device increases. In addition, the method of providing redundant OSUs and redundant BBUs requires two physical spaces, and thus has the disadvantage of increasing the size of the station-side apparatus compared to the case of one redundant optical communication unit.

  An object of the present invention is to enable protection of a plurality of types of optical communication units having different communication methods, even in the case of adopting an optical switch having one spare port, in view of the conventional problems.

  (1) A device according to an aspect of the present invention is an optical switch having a plurality of working ports and one spare port, and an optical communication unit optically connected to the working ports, wherein a plurality of communication systems are different. And a spare unit capable of supporting a plurality of types of communication methods, and the spare port connected to the working port of the switching source. And a control unit that executes protection including a first control and a second control that causes the spare unit to operate according to the communication method of the current unit that is the switching source.

  (6) A method according to an aspect of the present invention is an optical switch having a plurality of working ports and one spare port, and an optical communication unit optically connected to the working ports, wherein a plurality of communication systems are different. Kind Code: A1 A protection method of a station side apparatus comprising: a current unit of a type, and an optical communication unit optically connected to the spare port, the spare unit being compatible with a plurality of types of the communication method; Connecting the spare port to the current port of the above-mentioned step, and operating the spare unit according to the communication method of the current unit as the switching source.

  (7) An apparatus according to another aspect of the present invention is an optical communication unit for communicating with an opposing apparatus through an optical line, including transmission and reception of an optical signal transmitted to the optical line, the optical signal and the electric signal An optical transmission / reception unit that performs mutual conversion with each other, reception of an electric signal from the optical transmission / reception unit, transmission of an electric signal to the optical transmission / reception unit, and information for communicating the electric signal with the opposite device A communication circuit that executes processing, and the communication circuit is configured to be able to execute a plurality of types of the information processing based on different types of communication methods.

  (13) An apparatus according to another aspect of the present invention is one or more card slots housed inside a housing, and an optical communication unit mountable to the card slots, and a plurality of types of communication methods. And a control unit configured to execute control for operating the general-purpose unit according to a predetermined communication method among the plurality of types of communication methods.

  (14) A method according to another aspect of the present invention is one or more card slots housed inside a housing, and an optical communication unit mountable to the card slots, wherein a plurality of communication methods are used. A control method of a station side apparatus comprising a compatible general purpose unit, comprising: operating the general purpose unit according to a predetermined communication scheme among the plurality of types of communication schemes.

The present invention can be realized not only as a system and an apparatus having the above-described characteristic configurations, but also as a program for causing a computer to execute the characteristic configurations.
Furthermore, the present invention can be realized as a semiconductor integrated circuit that implements part or all of the system and apparatus.

  According to the present invention, even when an optical switch having one spare port is employed, protection of a plurality of types of optical communication units with different communication systems can be performed.

It is a block diagram showing an example of composition of an optical communication system and station side apparatus. It is a block diagram showing an example of composition of an optical switch. It is a block diagram showing an example of composition of a PON unit. It is a block diagram which shows the structural example of MC unit. It is a block diagram showing an example of composition of a spare unit. It is a block diagram which shows an example of the hardware constitutions of FPGA contained in a preliminary | backup unit. It is a block diagram which shows another example of the hardware constitutions of FPGA contained in a preliminary | backup unit. It is a flowchart which shows an example of the switching process by a management control part. It is a flowchart which shows an example of the switchback process by a management control part. It is a block diagram which shows the modification of a spare unit. It is a block diagram which shows the modification of station side apparatus.

<Overview of Embodiments of the Present Invention>
Hereinafter, the outline of the embodiment of the present invention will be listed and described.
(1) The station-side apparatus of the present embodiment is an optical switch having a plurality of working ports and one spare port, and an optical communication unit optically connected to the working ports, and a plurality of types of communication methods are different. And an optical communication unit optically connected to the spare port, wherein the spare unit is compatible with a plurality of types of communication methods, and the spare port is connected to the working port as a switching source. A control unit that executes protection including: 1 control; and 2nd control for operating the spare unit according to the communication method of the current unit to be switched.

  According to the optical communication apparatus of the present embodiment, the control unit performs the first control of connecting the protection port to the switching source active port, and the second control of operating the protection unit according to the communication method of the switching source switching unit. Since it is possible to execute protection including a plurality of types of optical communication units having different communication methods, even in the case of adopting an optical switch having one spare port.

  (2) In the station-side apparatus of the present embodiment, in the case where the plurality of active units and the spare unit are further connected electrically to each other, the protection unit includes the concentrator connected to the upper network. Preferably, a third control is included to instruct the concentrator to reset the communication path accompanying the operation of the unit.

  According to the optical communication device of the present embodiment, since the third control described above is included in the protection by the control unit, even in the case of a station-side apparatus having a concentration unit leading to the upper network, plural types of light having different communication methods Protection of the communication unit can be implemented.

(3) In the station-side apparatus according to the present embodiment, preferably, the control unit executes the protection in response to a failure occurrence in the current unit.
In this case, protection of the current unit in which a failure has occurred can be implemented.

(4) In the station-side apparatus of the present embodiment, preferably, the control unit executes the protection in response to the reception of an execution command from an external apparatus communicating with the own apparatus.
In this case, protection can be performed at a desired timing when the user operates and inputs an execution command to the external device.

(5) In the station-side apparatus of the present embodiment, when the spare unit is also connectable to the current port, the controller uses a predetermined communication method among the plurality of communication methods. Preferably, the spare unit connected to the working port is operated.
In this way, the spare unit connected to the working port can be used as the working unit, so the use of the spare unit can be expanded.

(6) The protection method of the present embodiment relates to a protection method executed by the station-side device described in (1) to (5) above.
Therefore, the protection method of the present embodiment exhibits the same effects as the station-side apparatus described in the above (1) to (5).

  (7) The optical communication unit according to the present embodiment is an optical communication unit that communicates with the opposite device through the optical line, and transmits and receives the optical signal transmitted to the optical line, and the optical signal and the electric signal. An optical transmission / reception unit that performs mutual conversion, reception of an electric signal from the optical transmission / reception unit, transmission of an electric signal to the optical transmission / reception unit, and information processing for communicating the electric signal with the opposing device And a communication circuit to be executed, the communication circuit being configured to be able to execute a plurality of types of the information processing based on different types of communication methods.

  According to the optical communication unit of the present embodiment, since the communication circuit is configured to be able to execute a plurality of types of information processing based on different types of communication methods, a plurality of types of optical communication units having different communication methods An optical communication unit (specifically, a spare unit) is obtained which is useful for the above-mentioned station-side apparatus which implements the above-mentioned protection.

(8) In the optical communication unit according to the present embodiment, in the case where the optical transmission / reception unit includes a plurality of types of optical transceivers corresponding to one type of the communication method, the plurality of optical transceivers may be connected to the optical line. Preferably, they are connected to the communicating optical fiber through an optical branching device.
In this case, since the plurality of optical transceivers are connected to the optical fiber connected to the optical line through the optical branching device, appropriately transmitting and receiving the optical signal even if the optical transmission and reception unit is configured with the plurality of optical transceivers Can.

(9) In the optical communication unit according to the present embodiment, when the light transmitting / receiving unit includes one light transceiver corresponding to a plurality of types of communication methods, at least one of the light intensity and the light reception sensitivity of the light transceiver. It is preferable to further include an adjustment unit that adjusts one for each type of communication scheme.
In this case, since at least one of the light intensity and the light receiving sensitivity of the optical transceiver is adjusted for each type of communication system, transmission and reception of optical signals can be appropriately performed even if the optical transmission and reception unit is configured with one optical transceiver. it can.

(10) In the optical communication unit according to the present embodiment, when the communication circuit includes an FPGA, the FPGA executes a plurality of logic circuit areas that execute the information processing respectively corresponding to the communication methods of different types. It is preferable to have a logic circuit field including: and a selector for selecting the logic circuit area.
In this case, there is an advantage that switching of the communication function can be performed more quickly than in the below-described FPGA, which switches the communication function by reconfiguring the PR field.

  (11) In the optical communication unit according to the present embodiment, when the communication circuit includes an FPGA, the FPGA is a logic circuit field capable of changing the connection structure of the logic block, and the connection structure. Of the PR field so as to execute the information processing based on the predetermined communication method based on a storage unit for storing setting information of one of the setting information and one of the setting information designated from among the stored setting information. It is preferable to have the reconfiguration | reformation part which changes the said connection structure.

  In this case, there is an advantage that a small-scale FPGA with a smaller number of gates can be adopted as compared with the above-described FPGA in which the communication function is switched by selecting any of the logic circuit areas configured in advance in the logic circuit field.

(12) In the optical communication unit according to the present embodiment, the PR field is preferably set to the connection structure that executes the information processing based on a specific communication method in an initial state before selection.
In this case, even if the reconfiguration unit does not perform reconfiguration, the communication function of the specific communication scheme (for example, the communication scheme designated to the higher priority one) can be immediately executed.

  (13) The station-side device of the present embodiment is an optical communication unit that can be attached to one or a plurality of card slots housed in a housing and the card slots, and can be compatible with a plurality of communication methods. And a control unit that executes control to operate the general-purpose unit according to a predetermined communication method among the plurality of types of communication methods.

  According to the station-side apparatus of the present embodiment, the control unit executes control to operate the general-purpose unit according to the predetermined communication method among the plurality of types of communication methods. For example, the dedicated unit performs only the predetermined communication method Even when it is out of stock and can not be used, communication service by the station-side device can be maintained by substituting communication based on a predetermined communication scheme with a general-purpose unit.

(14) The control method of the present embodiment relates to the control method executed by the station-side device described in (13) above.
Therefore, the control method of the present embodiment exhibits the same effects as the station-side apparatus described in (13) above.

<Details of the Embodiment of the Present Invention>
The details of the embodiments of the present invention will be described below with reference to the drawings. Note that at least a part of the embodiments described below may be arbitrarily combined.
In this embodiment, the optical line termination device on the upper side of the PON is referred to as "OSU", and the optical line termination device on the lower side of the PON is referred to as "ONU".

There is EPON as a communication method in PON, and registration of an ONU, leaving, bandwidth assignment to an ONU, bandwidth request from an ONU, etc. are performed by an MPCP (Multi-Point Control Protocol) frame defined by IEEE 802.3ah.
In addition, a set of higher-end optical line termination units ("OSU" and "BBU" in Fig. 1) installed in the central office of a telecommunications carrier is called "station-side unit" and can be used as a subscriber's house or the like. The lower-side optical line terminal equipment ("ONU" and "RRH" in FIG. 1) to be installed is referred to as "facing device".

[Configuration of optical communication system]
FIG. 1 is a block diagram showing an example of the configuration of an optical communication system and a station-side device 1.
As shown in FIG. 1, in the optical communication system of this embodiment, a plurality of light beams connecting the station-side device 1, the plurality of opposing devices 2, the station-side device 1 and the plurality of opposing devices 2 in a one-to-many relationship And line 3.
The upper end and the lower end of each of the plurality (N in the example of FIG. 1) of the optical lines 3 terminate at the station-side device 1 and the opposing device 2 respectively.

The optical line 3 includes a plurality of types of optical lines 3A and 3B corresponding to different communication standards. The optical line 3A is, for example, a PON line. The optical line 3B is an optical line based on a communication standard other than PON, such as a digital RoF (Radio over Fiber) system, for example.
In the example of FIG. 1, a CPR (Common Public Radio Interface) line is adopted as an optical line 3B of the digital RoF system for connecting a BBU (Base Band Unit) and an RRH (Remote Radio Head).

The optical line 3B may be a digital RoF optical line according to a communication standard other than CPRI, such as OBSAI (Open Base Station Architecture). The optical line 3B may be an optical line of a communication standard other than the digital RoF system.
The PON line 3A is an optical fiber network of a tree structure in which the optical fiber 5 is branched by a passive optical branching node including an optical coupler 4. The CPRI line 3 B is configured of one optical fiber 5.

The station-side device 1 is connected to the upper end of the trunk of the PON line 3A (the optical fiber 5 at the upper side of the optical coupler 4), and the lower side of the branch of the PON line 3 (the optical fiber 5 at the lower side of the optical coupler 4). The ONU 2A is connected to the side end. The ONU 2 A is a type of opposing device 2.
The station-side apparatus 1 is connected to the upper end of the CPRI line 3B, and the RRH 2B is connected to the lower end of the CPRI line 3B. RRH 2 B is a type of opposing device 2.

The upper side of the station-side device 1 is connected to an upper network including a core network and the like. The lower side of the ONU 2A is connected to a lower network such as a Local Area Network (LAN).
The RRH 2B can perform wireless communication with one or more mobile terminals (not shown) included in a communication cell of the own device.

[Configuration of station side apparatus]
The station-side apparatus 1 according to the present embodiment has redundant configuration light in which an extra number (N + 1 in FIG. 1) of optical communication units 13 and 14 are accommodated in the inside of the casing with respect to the N optical lines 3. It consists of a communication device.

The housing of the station-side device 1 uses a housing of a multi-slot OLT in which a plurality of card slots (not shown) are provided in parallel. The optical communication units 13 and 14 have substantially the same substrate shape, and can be detachably mounted to any card slot.
The station-side apparatus 1 according to the present embodiment includes, in order from the upper side, the concentrator 11, the management control unit 12, a plurality of active (operational) optical communication units 13, one spare (standby) optical communication unit 14, And an optical switch 15.

In the illustrated example, one spare optical communication unit 14 is added to the N optical communication units 13 for current use, and the configuration is an N: 1 redundant configuration. That is, the first to N-th optical communication units 13 are active systems, and the (N + 1) -th optical communication unit 14 is a spare system.
However, the port number i (i = 1 to N + 1) of the spare optical communication unit 14 is not limited to the N + 1th, and the spare optical communication unit 14 is set to any port number i of 1 to N. It is also good.

A plurality of types of optical communication units 13A and 13B are included in the currently used optical communication unit (hereinafter also referred to as "current unit") 13.
The active unit 13A is, for example, a "PON unit" operating as an OSU of PON. The active unit 13B is, for example, an "MC (media converter) unit" that operates as a BPRI of CPRI. Each of the PON unit 13A and the MC unit 13B may be at least one.

The spare optical communication unit (hereinafter, also referred to as "spare unit") 14 corresponds to protection of all types of current units 13A and 13B, and thus light that can operate on any of the current units 13A and 13B. It consists of a communication unit.
Configuration examples (FIGS. 3 to 5) of the PON unit 13A, the MC unit 13B, and the spare unit 14 described above will be described later.

The concentrator 11 is formed of an L2 (layer 2) switch including an integrated circuit such as an FPGA (Field-Programmable Gate Array), for example. The concentrator 11 sets a communication path between communication ports in accordance with the destination of the received layer 2 communication frame.
The line concentrator 11 multiplexes upstream frames input from the optical communication units 13 and 14 and transmits the multiplexed frames to the upper network, and distributes downstream frames received from the upper network to the appropriate optical communication units 13 and 14, etc. .

The optical switch 15 is an “N + 1 line switching type” optical switch capable of interrupt switching of one channel for any one of N channels.
The optical switch 15 includes N + 1 upper ports and N lower ports. The active unit 13 is connected to the first to N-th upper ports, and the spare unit 14 is connected to the (N + 1) -th upper port. The optical lines 3A and 3B are connected to the 1st to Nth lower side ports corresponding to the 1st to Nth upper side port, respectively.

  Hereinafter, the first to N-th lower ports corresponding to the first to N-th upper ports to which the current unit 13 is connected will be referred to as “current ports”. Further, the N + 1-th upper side port to which the spare unit 14 is connected is referred to as a "spare port".

The optical switch 15 can switch the internal optical transmission path based on the protection execution command from the management control unit 12 so that the spare unit 14 of the redundant system is connected to the optical lines 3A and 3B of the current unit 13. .
Here, assuming that the port number of the upper side port is “i” (= 1 to N + 1) and the port number of the lower side port is “j” (= 1 to N), the optical switch 15 operates during normal operation. Does not connect the spare port (i = N + 1) with the working ports (j = 1 to N).

For example, when an execution command for operating the spare unit 14 of the redundant system is received instead of the current unit 13 of i = 1, the optical switch 15 receives the redundant port (i = N + 1) of the redundant system, port number j = 1 Connect to the working port of.
Similarly, when an execution command to operate the spare unit 14 of the redundant system is received instead of the active unit 13 of i = 2 to N, the optical switch 15 receives the spare port (i = N + 1), the port number Connect to any working port of j = 2 to N.

The management control unit 12 is an information processing apparatus including a CPU (Central Processing Unit). The number of CPUs of the management control unit 12 may be one or more, and may include integrated circuits such as an FPGA and an application specific integrated circuit (ASIC).
The management control unit 12 includes a random access memory (RAM). The RAM is configured by a memory element such as an SRAM (Static RAM) or a DRAM (Dynamic RAM), and temporarily stores a computer program executed by a CPU or the like and data necessary for the execution.

The management control unit 12 is an information processing apparatus that controls the station apparatus 1 in an integrated manner. The management control unit 12 is communicably connected to the concentrator 11, the optical communication units 13 and 14, and the optical switch 15 via an internal bus.
The management control unit 12 can exchange information with each of the optical communication units 13 and 14 individually. Each of the optical communication units 13 and 14 can exchange information directly with the other optical communication units 13 and 14 or indirectly via the management control unit 12.

  When performing protection, that is, when switching from the current unit 13 in operation to the standby unit 14 in standby, the management control unit 12 switches the control signal including the “execution command” of the protection to the line concentrator 11. The original working unit 13, the spare unit 14 to be switched to, and the optical switch 15 are respectively transmitted.

In this case, the switching destination spare unit 14 wakes up each internal circuit, and stands by for the same communication processing as the switching source working unit 13. The concentrator 11 resets the communication path associated with the operation of the backup unit 14.
The optical switch 15 connects the working port of the switching source port number j specified by the execution command of the management control unit 12 to the spare port (i = N + 1). The switching source working unit 13 sleeps each internal circuit and suspends operation.

  When canceling the protection of the optical communication, that is, when switching back from the spare unit 14 in operation to the original current unit 13, the management control unit 12 includes a control signal including a “cancel command” of the protection. , The current unit 13 of the switching source, the spare unit 14 of the switching destination, and the optical switch 15.

In this case, the working unit 13 to which the switching back is performed wakes up each internal circuit, and stands by for the communication processing that was performed before the switching back the spare unit 14 before switching back. The concentrator 11 resets the communication path according to the operation of the current unit 13.
The optical switch 15 disconnects, from the protection port (i = N + 1), the current port for the port number j of the return destination specified by the release command of the management control unit 12. The spare unit 14 from which the switching back is performed causes each internal circuit to sleep down and to stop its operation.

The management control unit 12 is communicably connected to an operation interface (IF) 16 connected to the station-side device 1. The operation interface 16 is a communication device that communicates with the management device 18 in accordance with a predetermined communication standard.
The operation interface 16 can communicate with the management apparatus 18 via a management network 17 such as a public communication network or a local area communication network. The management device 18 is, for example, a server computer device operated by a carrier of the optical communication system.

The communication between the management device 18 and the operation interface 16 may be communication via the upper network, or may be direct communication not via the management network 17 or the upper network. This direct communication may be either wired communication or wireless communication.
The management device 18 can receive input of operation information by a network administrator (hereinafter, also referred to as “user”) of a communication carrier. The operation information input to the management device 18 includes the above-mentioned protection execution command and cancellation command.

[Configuration of optical switch]
FIG. 2 is a block diagram showing a configuration example of the optical switch 15.
As shown in FIG. 2, the optical switch 15 includes a plurality of upper optical fibers (hereinafter referred to as “upper fibers”) 21-i (i = 1 to N + 1) and a plurality of one less than that. The lower optical fiber (hereinafter referred to as “lower fiber”) 22-j (j = 1 to N) and one switch unit 23 are provided.

The 1st to N-th upper fibers 21-i are connected to the 1st to N-th lower fibers 22-j via the optical coupler 24, respectively. Each of the optical couplers 24 is connected to an optical fiber (hereinafter referred to as “branch fiber”) 25-j that branches an optical signal.
The end of the (N + 1) -th upper fiber 21 -N + 1 is disposed on the upper side of the switch unit 23. The end portions of the N branch fibers 25-j (j = 1 to N) are arranged on the lower side of the switch unit 23.

The switch unit 25 is configured of, for example, a movable mirror driven by the actuator 26. The actuator 26 moves the direction of the movable mirror 23 based on the execution command from the management control unit 12.
The protection execution command includes the port number j of the branch fiber 25-j connected to the upper fiber 21-N + 1. The actuator 26 moves the movable mirror toward the branch fiber 25-j of the port number j included in the execution command.

For example, in the case of an execution command for protecting the current unit 13 of port number i = 1, the actuator 26 is such that the upper fiber 21 -N + 1 is optically connected to the lower fiber 22-1 of port number j = 1. To move the movable mirror.
The upstream optical signal transmitted to the lower fiber 22-1 is divided into an optical signal to the upper fiber 21-1 and an optical signal to the branch fiber 25-1. The movable mirror 23 directs the optical signal transmitted from the branch fiber 25-1 to be incident on the upper fiber 21-N + 1.

The movable mirror 23 directs the downstream optical signal sent from the end of the upper fiber 21-N + 1 of port number i = N + 1 to be incident on the branch fiber 25-1.
The upstream optical signal incident on the branch fiber 25-1 is transmitted to the lower fiber 22-1 of port number j = 1 via the optical coupler 24.

The actuator 26 returns the direction of the movable mirror 23 to the original standby position based on the protection release command.
The direction of the movable mirror 23 in the standby position is such that the upper fiber 21-N + 1 and all the branch fibers 25-j (j = 1 to N) are not optically connected.

[Method of protection]
The following two methods are available for protection of the station-side device 1 according to the present embodiment.
First protection: protection executed triggered by the occurrence of a fault in the current unit 13 Second protection: executed triggered by the reception of an execution command from an external device (for example, the management device 18) communicating with the station-side device 1 Protection

Triggers of the first protection include, for example, when a failure of the current unit 13 is detected, or when the current unit 13 does not receive an upstream optical signal for a certain period (detection of “Optical LoS event”).
"LoS" means "Loss of Signal". In the following, an Optical LoS event is also referred to as a "LoS event".

The first protection trigger also includes failure detection by the opposing device 2. For example, the opposing device 2 detects a LoS event when it does not receive the downstream optical signal for a certain period.
When the opposing device 2 detects a LoS event, it transmits an OAM (Operations, Administration and Maintenance) frame including this event to the current unit 13.
The current unit 13 that has acquired this event notifies the management control unit 12 to that effect, and the management control unit 12 executes the first protection in response to this.

In the case of fault detection by the opposing apparatus 2, the opposing apparatus 2 detects the completion of protection by the station-side apparatus 1 by receiving a control frame from the spare unit 14.
For example, the opposing device 2 receives a predetermined control frame (for example, an MPCP frame, an extended MAC control frame, an extended OAM frame, and the like) from the backup unit 14 after the own device detects a LoS event. Thereby, the opposing device 2 detects that the redundant switching (protection of the optical communication unit 13) by the station-side device 1 is completed.

[Process content when executing protection]
When performing protection, the management control unit 12 transmits a control signal including a protection execution command to the concentrator 11, the current unit 13 of the switching source, the spare unit 14 of the switching destination, and the optical switch 15.
The execution command received by the protection unit 14 includes type information (in the present embodiment, the PON unit 13A or the MC unit 13B) of the current unit 13 of the switching source, and the opposing device 2 in communication with the current unit 13 of the switching source. Management information etc.

The spare unit 14 of the switching destination adjusts the communication circuit of its own device so that communication processing (in the present embodiment, PON communication or CPRI communication) corresponding to the type information notified from the management control unit 12 can be performed. Do.
That is, when the type information is "PON unit 13A", the spare unit 14 sets the communication function with the opposing apparatus 2 to PON communication, and when the type information is "MC unit 13B", the spare unit 14 with the opposing apparatus 2 Set the communication function to CPRI communication.

The current unit 13 of the switching source that has received the protection execution command transmits the management information of the opposing device 2 under control to the management control unit 12. The management control unit 12 transfers the management information of the opposing apparatus 2 received from the active unit 13 to the spare unit 14 of the switching destination.
However, the current unit 13 may transmit the management information of the opposing apparatus 2 directly to the spare unit 14 without passing through the management control unit 12.

The concentrator 11 having received the protection execution command stops the communication port of the current unit 13 of the switching source, and the communication path between the communication ports so that the communication port of the backup unit 14 substitutes the communication port of the current unit 13 Reset the
Upon receiving the protection execution command, the optical switch 15 receives the lower port (j = 1 to N) of the lower end port (j = 1 to N) of the optical line 3 corresponding to the current unit 13 of the switching source. Connect to = N + 1).

The spare unit 14 executes predetermined communication processing on the opposing device 2 using the management information of the opposing device 2 received from the management control unit 12 or the current unit 13.
That is, the spare unit 14 performs the same communication process as the communication process performed before the switching unit 2 connected to the optical switch 15 via the optical line 3 and the switching unit current unit 13 before switching.

When the switching source is the PON unit (OSU) 13A, for example, the following information 1 to 5 are included in the management information on the ONU 2A transmitted by the PON unit 13A.
1) ONU Type Information This type information is, for example, information indicating whether the ONU is 1GONU, 10G asymmetric ONU, or 10G symmetric ONU.
2) MAC address of ONU

3) RTT (Round Trip Time) information of ONU 4) QoS (Quality of Service) parameter This parameter is a parameter for defining the priority class, the minimum guaranteed bandwidth and the maximum allowable bandwidth to be set to the ONU.
5) VLAN mode in upper network

When the switching source is the MC unit (BBU) 13A, for example, the following information 6 to 10 is included in the management information on the RRH 2B transmitted by the MC unit 13B.
6) RRH Type Information This type information is, for example, information indicating which type of a small cell or a pico cell an RRH is a base station.
7) MAC address of RRH

8) RTT (Round Trip Time) information of RRH 9) QoS (Quality of Service) parameter This parameter is a parameter for defining the priority class, the minimum guaranteed bandwidth, and the maximum allowable bandwidth to be set to the RRH.
10) VLAN mode in upper network

[Process content when canceling protection]
When canceling the protection, the management control unit 12 transmits a control signal including a cancellation command of the protection to the current concentration unit 11, the current unit 13 of the switching source, the spare unit 14 of the switching destination, and the optical switch 15.

The current unit 13 at the switchback destination that has received the release command of protection executes the communication process (in the present embodiment, PON communication or CPRI communication) that was executed before the switchback source spare unit 14 switched back.
That is, when the current unit 13 is "PON unit 13A", the PON unit 13A executes PON communication with the ONU 2A. When the current unit 13 is "MC unit 13B", the MC unit 13B communicates with the RRH 2B. Execute CPRI communication.

The spare unit 14 of the return source that has received the protection release command transmits the management information of the opposing device 2 under control to the management control unit 12. The management control unit 12 transfers the management information of the opposing apparatus 2 received from the spare unit 14 to the working unit 13 of the switching back destination.
However, the standby unit 14 may directly transmit the management information of the opposing apparatus 2 to the current unit 13 without passing through the management control unit 12.

Communication between communication ports is performed so that the concentrator 11 having received the release command of protection stops the communication port of the spare unit 14 of the switching back source and substitutes the communication port of the active unit 13 with the communication port of the backup unit 14 Reset the route.
The optical switch 15 that has received the release command of protection switches the lower side ports (j = 1 to N) of the optical line 3 corresponding to the working unit 13 to be switched back, and the spare port corresponding to the spare unit 14 to be switched back. Disconnect from (i = N + 1).

The active unit 13 executes a predetermined communication process on the opposing device 2 using the management information of the opposing device 2 received from the management control unit 12 or the spare unit 14.
That is, the active unit 13 performs the same communication processing as the communication processing that the spare unit 14 connected to the optical switch 15 via the optical line 3 has performed and before the spare unit 14 used for the switchover is switched back.

[Configuration of PON unit]
FIG. 3 is a block diagram showing a configuration example of the PON unit 13A.
As shown in FIG. 3, the PON unit (OSU) 13A according to the present embodiment includes the upper interface 31, the PON controller 32, the reception processor 33, the transmission processor 34, the PON transceiver 35, and the control interface 36. Equipped with In addition, the PON unit 13A includes an upstream buffer 37 and a downstream buffer 38.

The upper side interface unit 31 is formed of an integrated circuit that executes communication processing of layer 2 on the electric signals in the upward and downward directions.
The PON control unit 32, the reception processing unit 33, and the transmission processing unit 34 are integrated circuits (for example, PON-MAC chip or PON-MAC / PHY) that execute communication processing relating to PON on uplink and downlink electrical signals. Chip).

The control interface unit 36 is an integrated circuit that relays control signals exchanged between the management control unit 12 and the units 31 to 35 in the PON unit 13A.
The control interface unit 36 is connected to the management control unit 12 and the units 31 to 35 in the PON unit 13A by an internal bus shown by a broken line in FIG.

The PON transceiver unit 35 is formed of an optical device (for example, a pluggable optical transceiver) including an element that transmits and receives an optical signal. The PON transmission and reception unit 35 converts the 1.27 μm band optical signal from the optical switch 15 into an electrical signal, and sends the converted electrical signal to the reception processing unit 33.
The PON transmission / reception unit 35 converts the electrical signal from the transmission processing unit 34 into a 1.577 μm band optical signal, and sends the converted optical signal to the optical switch 15.

The reception processing unit 33 reconstructs a frame from the electrical signal input from the PON transmission / reception unit 35. If the frame type is a control frame such as an MPCP frame or an OAM frame, the reception processing unit 33 outputs the control frame to the PON control unit 32.
If the frame type is a user frame, the reception processing unit 33 outputs the user frame to the upstream buffer 37.

If there is a frame in the upstream buffer 37, the upper interface 31 extracts the frame and outputs the frame to the concentrator 11 on the upper side.
When the frame is input from the line concentrator 11 on the upper side, the upper side interface unit 31 outputs the frame to the down buffer 38.

The transmission processing unit 34 outputs the control frame input from the PON control unit 32 to the PON transmission / reception unit 35 as an electrical signal.
If there is a frame in the downstream buffer 38, the transmission processing unit 34 extracts it from the downstream buffer 38 at intervals of the control frame from the PON control unit 32, and outputs it to the PON transceiver 35 as an electrical signal.

The PON control unit 32 generates a control frame such as an MPCP frame and an OAM frame for managing the subordinate ONU 2A, and inputs the generated control frame to the transmission processing unit 34. The transmission processing unit 34 outputs the input control frame to the PON transmission / reception unit 35.
The PON control unit 32 receives a control frame such as an MPCP frame and an OAM frame sent from the ONU 2A via the PON transceiver unit 35 and the reception processing unit 33, and performs processing corresponding to the contents of the received control frame.

In the present embodiment, the PON control unit 32 of the PON unit 13A performs the following processing in accordance with the OAM event included in the OAM frame received from the ONU 2A.
For example, if the OAM event notified from the ONU 2A is a LoS event, the PON control unit 32 transfers the notified LoS event to the management control unit 12. The notification of the LoS event from the ONU 2A triggers the first protection.

When each of the units 31 to 35 in the PON unit 13A acquires a failure detection signal (for example, a LoS event detected by the PON transmission / reception unit 35), the unit 31 transmits the detection signal to the management control unit 12. This detection signal triggers the first protection.
Specifically, the management control unit 12 having received the above detection signal controls the PON unit 13A of the transmission source of the detection signal, the spare unit 14, the line concentrator 11, and the optical switch 15 to include a control signal including an execution command for protection. Send

The PON control unit 32 of the PON unit 13A that has received the protection execution command from the management control unit 12 transmits a sleep instruction to the units 31, 33, 34, and 35 in the PON unit 13A.
The PON control unit 32 of the PON unit 13A that has received the protection release instruction from the management control unit 12 transmits a wake instruction to each of the units 31, 33, 34, and 35 in the PON unit 13A.

[Configuration of MC unit]
FIG. 4 is a block diagram showing a configuration example of the MC unit 13B.
As shown in FIG. 4, the MC unit (BBU) 13B of the present embodiment includes an upper interface unit 41, an MC control unit 42, a reception processing unit 43, a transmission processing unit 44, an MC transmission / reception unit 45, and a control interface unit 46. Equipped with Also, the MC unit 13 B includes an upstream buffer 47 and a downstream buffer 48.

The upper side interface unit 41 is formed of an integrated circuit that executes communication processing of layer 2 on the electric signals in the upward and downward directions.
The MC control unit 42, the reception processing unit 43, and the transmission processing unit 44 are integrated circuits (for example, CPRI-MAC chip or CPRI-MAC / PHY) that execute communication processing related to CPRI on uplink and downlink electric signals. Chip).

The control interface unit 46 is an integrated circuit that relays control signals exchanged between the management control unit 12 and the units 41 to 45 in the MC unit 13B.
The control interface unit 46 is connected to the management control unit 12 and the units 41 to 45 in the MC unit 13B by an internal bus shown by a broken line in FIG.

The MC transmission / reception unit 45 is formed of an optical device (for example, a pluggable optical transceiver) including an element for transmitting and receiving an optical signal. The MC transmission / reception unit 45 converts the optical signal of the predetermined wavelength band from the optical switch 15 into an electrical signal, and sends the converted electrical signal to the reception processing unit 43.
The MC transmission / reception unit 45 converts the electrical signal from the transmission processing unit 44 into an optical signal of a predetermined wavelength band, and sends the converted optical signal to the optical switch 15.

The reception processing unit 43 reconstructs a frame from the electrical signal input from the MC transmission / reception unit 45. If the frame type is a control frame such as an OAM frame, the reception processing unit 43 outputs the control frame to the MC control unit 42.
If the frame type is a user frame, the reception processing unit 43 outputs the user frame to the upstream buffer 47.

If the upstream buffer unit 47 has a frame, the upper interface unit 41 takes out the frame and outputs the frame to the concentrator 11 on the upper side.
When the frame is input from the concentrator 11 on the upper side, the upper interface unit 41 outputs the frame to the down buffer 48.

The transmission processing unit 44 outputs the control frame input from the MC control unit 42 to the MC transmission / reception unit 45 as an electrical signal.
If there is a frame in the down buffer 48, the transmission processing unit 44 extracts it from the down buffer 48 in the interval of the control frame from the MC control unit 42 and outputs it as an electrical signal to the MC transmission / reception unit 45.

The MC control unit 42 generates a control frame such as an OAM frame for managing the subordinate RRH 2 B, and inputs the generated control frame to the transmission processing unit 44. The transmission processing unit 44 outputs the input control frame to the MC control unit 42.
The MC control unit 42 receives a control frame such as an OAM frame sent from the RRH 2B via the MC transmission / reception unit 45 and the reception processing unit 43, and performs processing corresponding to the content of the received control frame.

In the present embodiment, the MC control 42 of the MC unit 13B performs the following processing according to the OAM event included in the OAM frame received from the RRH 2B.
For example, when the OAM event notified from the RRH 2 B is a LoS event, the MC control unit 42 transfers the notified LoS event to the management control unit 12. The notification of the LoS event from the RRH 2B triggers the first protection.

When each of the units 41 to 45 in the MC unit 13B acquires a detection signal of failure (for example, a LoS event detected by the MC transmission / reception unit 45), the unit 41 transmits the detection signal to the management control unit 12. This detection signal triggers the first protection.
Specifically, the management control unit 12 having received the above detection signal controls the MC unit 13B of the transmission source of the detection signal, the spare unit 14, the line concentrator 11, and the optical switch 15 to include a control signal including a command to execute protection. Send

The MC control unit 42 of the MC unit 13B that has received the protection execution command from the management control unit 12 transmits a sleep instruction to the units 41, 43, 44, and 45 in the MC unit 13B.
The MC control unit 42 of the MC unit 13B that has received the protection release instruction from the management control unit 12 transmits a wake instruction to the units 41, 43, 44, and 45 in the MC unit 13B.

[Configuration of spare unit]
FIG. 5 is a block diagram showing a configuration example of the spare unit 14.
As shown in FIG. 5, the spare unit 14 of this embodiment includes the upper interface 51, the general control unit 52, the reception processing unit 53, the transmission processing unit 54, the PON transmission / reception unit 55A, the MC transmission / reception unit 55B, and the control interface. The unit 56 is provided. The spare unit 14 also includes an upstream buffer 57 and a downstream buffer 58.

The upper side interface unit 51 is formed of an integrated circuit that performs communication processing of layer 2 on the electric signals in the upward and downward directions.
The general-purpose control unit 52, the reception processing unit 53, and the transmission processing unit 54 are formed of integrated circuits including the FPGAs 60 and 70 (see virtual lines in FIG. 5). Execute communication processing selectively. The hardware configuration (FIGS. 6 and 7) of the FPGAs 60 and 70 capable of executing different communication processes will be described later.

The control interface unit 56 is an integrated circuit that relays control signals exchanged between the management control unit 12 and the units 51 to 55 in the spare unit 14.
The control interface unit 56 is connected to the management control unit 12 and the units 51 to 55 in the spare unit 14 by an internal bus shown by a broken line in FIG. 5.

The PON transceiver 55A is made of the same optical device as the PON transceiver 35 of the PON unit 13A. The PON transmission / reception unit 55 A converts the 1.27 μm band optical signal from the optical switch 15 into an electrical signal, and sends the converted electrical signal to the reception processing unit 53.
The PON transmission / reception unit 55A converts the electrical signal from the transmission processing unit 54 into a 1.577 μm band optical signal, and sends the converted optical signal to the optical switch 15.

The MC transmission / reception unit 55B is made of the same optical device as the MC transmission / reception unit 45 of the MC unit 13B. The MC transmission / reception unit 55 B converts the optical signal in the predetermined wavelength band from the optical switch 15 into an electrical signal, and sends the converted electrical signal to the reception processing unit 53.
The MC transmission / reception unit 55 B converts the electrical signal from the transmission processing unit 54 into an optical signal of a predetermined wavelength band, and sends the converted optical signal to the optical switch 15.

  The optical fiber connected to the PON transmission / reception unit 55A and the optical fiber connected to the MC transmission / reception unit 55B are one optical fiber connected to the lower optical line 3 through the optical switch 15 by the optical branching device including the optical coupler 59 and the like. Are aggregated into The aggregated optical fiber is connected to the (N + 1) -th upper side port of the optical switch 15 (see FIG. 1).

The general control unit 52 of the standby unit 14 that has received the protection execution command from the management control unit 12 transmits a wake instruction to the units 51, 53, 54, 55A, and 55B in the standby unit 14.
The general control unit 52 of the spare unit 14 that has received the release command of the protection from the management control unit 12 transmits a sleep instruction to the units 51, 53, 54, 55A, and 55B in the spare unit 14.

However, when the type information included in the protection execution command from the management control unit 12 is "PON unit 13A", the PON transmission / reception unit 55A wakes up and operates, and the MC transmission / reception unit 55B sleeps down. Operation may be suspended.
Similarly, when the type information included in the protection release command from the management control unit 12 is "MC unit 13B", the MC transmission / reception unit 55B wakes up and operates, and the PON transmission / reception unit 55A sleeps down. Operation may be suspended.

The reception processing unit 53 reconstructs a frame from the electric signal input from the transmitting and receiving units 55A and 55B in operation. If the frame type is a control frame such as an MPCP frame or an OAM frame, the reception processing unit 53 outputs the control frame to the general control unit 52.
If the frame type is a user frame, the reception processing unit 53 outputs the user frame to the upstream buffer 57.

If there is a frame in the upstream buffer 57, the upper interface 51 extracts the frame and outputs the frame to the concentrator 11 on the upper side.
When the frame is input from the line concentrator 11 on the upper side, the upper side interface unit 51 outputs the frame to the down buffer 58.

The transmission processing unit 54 outputs the control frame input from the general control unit 52 to the transmitting / receiving units 55A and 55B in operation as an electric signal.
If there is a frame in the downstream buffer 58, the transmission processing unit 54 extracts it from the downstream buffer 58 in the interval of the control frame from the general control unit 52, and outputs it as an electrical signal to the transceivers 55A and 55B in operation.

If the type information included in the protection execution command from the management control unit 12 is "PON unit 13A", the general control unit 52 executes the same communication processing as the PON control unit 32 of the PON unit 13A. .
Specifically, the general control unit 52 generates a control frame such as an MPCP frame and an OAM frame for managing the subordinate ONU 2A, and inputs the generated control frame to the transmission processing unit 54. The transmission processing unit 54 outputs the input control frame to the PON transmission / reception unit 55A.

  The general control unit 52 receives a control frame such as an MPCP frame and an OAM frame sent from the ONU 2A via the PON transmission / reception unit 55A and the reception processing unit 53, and performs processing corresponding to the content of the received control frame.

If the type information included in the protection execution command from the management control unit 12 is "MC unit 13B", the general control unit 52 executes the same communication processing as the MC control unit 42 of the MC unit 13B. .
Specifically, the general-purpose control unit 52 generates a control frame such as an OAM frame for managing the subordinate RRH 2 B, and inputs the generated control frame to the transmission processing unit 54. The transmission processing unit 54 outputs the input control frame to the MC transmission / reception unit 55B.

  The general control unit 52 receives a control frame such as an OAM frame sent from the RRH 2B via the MC transmission / reception unit 55B and the reception processing unit 43, and performs processing corresponding to the content of the received control frame.

The general control unit 52 of the spare unit 14 performs the following processing in accordance with the OAM event included in the OAM frame received from the opposing device 2 (ONU 2A or RRH 2B).
For example, when the LoS event is not included in the OAM event notified from the opposing device 2 within a predetermined period, the general control unit 52 manages that the optical communication with the opposing device 2 after switching is normal. The control unit 12 is notified. Thus, the management control unit 12 recognizes the success of the protection.

When each of the units 31 to 35 and 41 to 45 in the active unit 13 acquires a recovery signal of failure (for example, cancellation of the LoS event detected by the PON transceiver unit 35), the unit transmits the detection signal to the management control unit 12. This detection signal triggers the release of the first protection.
Specifically, the management control unit 12 having received the above detection signal instructs the current unit 13 and spare unit 14 of the transmission source of the detection signal to the line concentrator 11 and the optical switch 15 to release the first protection. Transmit a control signal including

[Example of hardware configuration of FPGA]
FIG. 6 is a block diagram showing an example of the hardware configuration of the FPGA 60 included in the backup unit 14.
The FPGA 60 of the backup unit 14 shown in FIG. 6 includes an upper selector 61, a logic circuit field 62 including a number of logic blocks, and a lower selector 63.

In the logic circuit field 62, there are a PON area 64 to which a logic block is connected to enable information processing of PON communication, and an MC area 65 to which a logic block is connected to enable information processing of CPRI communication. included.
The PON area 64 executes the functions of the PON control unit 32, the reception processing unit 33, and the transmission processing unit 34 of the PON unit 13A. The MC area 65 executes the functions of the MC control unit 42, the reception processing unit 43, and the transmission processing unit 44 of the MC unit 13B.

The input / output ports of the communication frames of the areas 64 and 65 are connected to the upper selector 61 and the lower selector 63, respectively. The input / output port of the communication frame on the upper side of the upper selector 61 is connected to the upper side interface unit 51.
The upper selector 61 and the lower selector 63 are connected to the management control unit 12 via the control interface unit 56 by the internal bus, and the management control unit 12 and the selectors 61 and 63 can transmit and receive control signals.

When the type information included in the execution command from the management control unit 12 is “PON unit 13 A”, the upper selector 61 connects the lower side (right side) input / output port to the PON area 64. The lower selector 63 connects the upper side (left side) input / output port to the PON area 64, and connects the lower side (right side) input / output port to the PON transceiver 55A.
Thus, the FPGA 60 is an integrated circuit that executes the functions of the PON control unit 32, the reception processing unit 33, and the transmission processing unit 34 of the PON unit 13A.

When the type information included in the execution command from the management control unit 12 is “MC unit 13 B”, the upper selector 61 connects the lower input side (right side) input / output port to the MC area 65. The lower selector 63 connects the upper (left) input / output port to the MC area 65, and connects the lower (right) input / output port to the MC transmitter / receiver 55B.
Thus, the FPGA 60 is an integrated circuit that executes the functions of the MC control unit 42, the reception processing unit 43, and the transmission processing unit 44 of the MC unit 13B.

According to the FPGA 60 of FIG. 6, by selecting either the PON area 64 or the MC area 65 configured in the logic circuit field 62, the communication function by the FPGA 60 is switched to PON communication or CPRI communication.
Therefore, as compared with the FPGA 70 of FIG. 7 in which the communication function is switched by reconfiguring the PR field 71, there is an advantage that the switching of the communication function can be performed quickly.

[Another example of hardware configuration of FPGA]
FIG. 7 is a block diagram showing another example of the hardware configuration of the FPGA 70 included in the backup unit 14.
The FPGA 70 of the backup unit 14 shown in FIG. 7 includes a PR (Partial Reconfiguration) field 71 capable of reconfiguration including a large number of logic blocks, a reconfiguration unit 72, and a storage unit 73.

The input / output port of the communication frame on the upper side of the PR field 71 is connected to the upper side interface unit 51.
The input / output port of the communication frame on the lower side of the PR field 71 is connected to the PON transmission / reception unit 55A and the MC transmission / reception unit 55B.

The reconfiguration unit 72 can change the connection structure of the logical blocks included in the PR field 71 based on the setting information stored in the storage unit 73. The setting information of the storage unit 73 includes setting information for making the PR field 71 an information processing circuit for PON communication, and setting information for making the PR field 71 an information processing circuit for CPRI communication.
The reconfiguration unit 72 is connected to the management control unit 12 via the control interface unit 56, and the management control unit 12 and the reconfiguration unit 72 can transmit and receive control signals.

If the type information included in the protection execution command from the management control unit 12 is "PON unit 13A", the reconfiguration unit 72 reads the setting information for PON from the storage unit 73, and reads the read setting information. To change the connection structure of the logic block of the PR field 71, and set the PR field 71 in the communication circuit of PON communication.
Thus, the FPGA 70 is an integrated circuit that executes the functions of the PON control unit 32, the reception processing unit 33, and the transmission processing unit 34 of the PON unit 13A.

If the type information included in the protection execution command from the management control unit 12 is "MC unit 13B", the reconfiguration unit 72 reads the setting information for CPRI from the storage unit 73, and the read setting information To change the connection structure of the logic block of the PR field 71, and set the PR field 71 in the communication circuit of the CPRI communication.
Thus, the FPGA 70 is an integrated circuit that executes the functions of the MC control unit 42, the reception processing unit 43, and the transmission processing unit 44 of the MC unit 13B.

According to the FPGA 70 of FIG. 7, the communication function of the FPGA 70 is switched to PON communication or CPRI communication by reconfiguring the PR field 71.
Therefore, it is possible to adopt a small-scale FPGA 70 having a smaller number of gates as compared to the FPGA 60 of FIG. 6 which switches the communication function by selecting either the PON area 64 or the MC area 65 previously configured in the logic circuit field 62. It has the advantage of

In the FPGA 70 of FIG. 7, the PF field 71 is preferably set in advance in a communication circuit (in the example of FIG. 7, CPRI communication) determined by the user as having high priority in the state of initial setting.
In this case, when the type information is an execution command of the MC unit 13B, the communication function (CPRI communication) with higher priority can be immediately executed even if the reconfiguration unit 72 does not perform reconfiguration. However, the communication method with high priority may be PON communication.

[Switching process by management control unit]
FIG. 8 is a flowchart showing an example of switching processing (processing for executing protection) by the management control unit 12.
As shown in FIG. 8, the management control unit 12 always determines the occurrence of the switching trigger to the spare unit 14 (step ST10). The switching trigger includes, for example, reception of a protection execution command from the management device 18, elapse of a preset switching time, occurrence of a failure in the current unit 13, and the like.

If the above determination result is affirmative, the management control unit 12 determines whether or not switching to the switching destination spare unit 14 is possible (step ST11).
The above determination is performed, for example, based on the presence or absence of failure detection from the spare unit 14. That is, it is determined that switching is possible when there is no failure detection from the spare unit 14, and it is determined that switching is impossible when there is failure detection from the spare unit 14.

If the determination result in step ST11 is affirmative, the management control unit 12 reserves type information (PON unit 13A or MC unit 13B) of the current unit 13 of the switching source and management information of the facing device 2 of the switching source. The unit 14 is notified (step ST12).
Next, the management control unit 12 instructs the line concentrator 11 to reset the communication path accompanying the operation of the protection unit 14 (step ST13), and instructs the optical switch 15 to connect the protection port (i = N + 1). (Step ST14).

Finally, the management control unit 12 ends the process by instructing the switching source current unit 13 to stop the operation (step ST15).
If the determination result of step ST11 is negative, the management control unit 12 ends the process without performing the process of steps ST12 to ST15.

[Return processing by management control unit]
FIG. 9 is a flowchart showing an example of the switching back process (protection release process) by the management control unit 12.
As shown in FIG. 9, the management control unit 12 always determines the presence or absence of a switchback trigger to the current unit 13 (step ST20). The switchback timing includes, for example, reception of a protection release command from the management device 18 and recovery detection of a failure of the current unit 13 or the opposing device 2 once detected.

If the above determination result is affirmative, the management control unit 12 determines whether or not the switching back to the current unit 13 of the switching back destination is possible (step ST21).
The above determination is performed, for example, based on the presence or absence of failure detection from the current unit 13. That is, when there is no failure detection from the current unit 13, it is determined that the switchback is possible, and when there is failure detection from the current unit 13, it is determined that the switchback is impossible.

If the determination result of step ST21 is affirmative, the management control unit 12 notifies the current unit 13 of the management information of the opposing apparatus 2 with which the current unit 13 of the switching back destination was in communication (step ST22). .
Next, the management control unit 12 instructs the line concentrator 11 to reset the path information accompanying the operation of the current unit 13 (step ST23), and instructs the optical switch 15 to disconnect the spare port (i = N + 1). (Step ST24).

Finally, the management control unit 12 ends the process by instructing the standby unit 14 to be in the standby state by switching back to stop the operation (step ST25).
If the determination result of step ST21 is negative, the management control unit 12 ends the process without performing the process of steps ST22 to ST25.

First Modified Example
FIG. 10 is a block diagram showing a modification of the spare unit 14.
The spare unit 14 of FIG. 10 differs from the spare unit 14 of FIG. 5 in that the transmitting / receiving unit connected to the optical switch 15 is composed of a common transmitting / receiving unit 55 which is one optical device.

That is, the shared transmission / reception unit 55 employed by the spare unit 14 according to the modification is formed of one optical device (for example, a pluggable optical transceiver) that can cope with both PON communication and CPRI communication.
As described above, if the common transmission / reception unit 55 formed of one optical device is adopted, it is not necessary to provide the transmission / reception units 55A and 55B for each type of optical communication, and the optical coupler 59 (see FIG. 5) is also unnecessary. The manufacturing cost of the spare unit 14 can be reduced.

Generally, the PON line 3A has a longer optical signal transmission distance than the CPRI line 3B. For this reason, the optical transceivers used for PON are generally more efficient than the optical transceivers used for CPRI in terms of optical power, transmission rate, and so on.
Therefore, it is preferable to use an optical transceiver for PON as the common transmission / reception unit 55 and to use the optical transceiver for PON also for CPRI communication.

However, when the optical transceiver for PON is used for CPRI communication, the optical intensity of the downstream optical signal is too high depending on the transmission distance from the station-side device 1 to the opposing device 2 (RRH 2B), and the opposing device 2 is likely to fail. there is a possibility.
In addition, there is a possibility that the upstream optical signal can not be properly received because the arrival light amount of the upstream optical signal from the RRH 2B is small.

Therefore, as shown in FIG. 10, in accordance with the control signal from the management control unit 12, at least one of the light intensity of the downstream optical signal transmitted by the common transmission / reception unit 55 and the light reception sensitivity of the upstream optical signal is adjusted. It is preferable to provide the adjustment unit 75 in the spare unit 14.
In this case, when the shared transmission / reception unit 55 formed of an optical transceiver for PON performs CPRI communication, the power may be adjusted to be lower. Further, when the reaching light amount of the upstream optical signal from the RRH 2B is smaller than that of the ONU 2A, the light reception sensitivity may be increased.

Second Modified Example
FIG. 11 is a block diagram showing a modification of the station-side device 1. The modification of FIG. 11 illustrates another application of the optical communication unit 14 corresponding to a plurality of communication methods.
The difference between the station-side device 1 of FIG. 11 and the station-side device 1 of FIG. 1 is that the optical switch 15 for making the station-side device 1 redundant is not provided and plural (N in the example shown) optical communication The units 13 and 14 are connected to the optical line 3 without passing through the optical switch 15 respectively.

The station-side device 1 includes a housing 6 and N card slots 7 (slot numbers = # 1 to #N) accommodated in the housing 6. Circuit boards of substantially the same shape are employed in the PON unit 13A, which is a "dedicated unit" of PON communication, and the MC unit 13B, which is a "dedicated unit" of CPRI communication.
Therefore, these dedicated units 13A and 13B can be inserted into and removed from card slot 7 of any slot number # 1 to #N which the user arbitrarily selects.

The general-purpose unit 14 has the same circuit configuration (FIG. 5) as the spare unit 14 described above, and can cope with both PON communication and CPRI communication. Further, a circuit board having substantially the same shape as the dedicated units 13A and 13B is adopted for the general-purpose unit 14.
Therefore, the general-purpose unit 14 can also be inserted into and removed from the card slot 7 of any slot number # 1 to #N which the user arbitrarily selects.

FIG. 11 exemplifies the case where the general-purpose unit 14 is inserted into the #N card slot 7 and is operating as the PON unit 13 which performs PON communication.
To configure the station-side device 1 of FIG. 11, the general purpose unit 14 inserted into the #N card slot 7 is operated as a PON unit 13A performing PON communication by a control signal from the management control unit 12 Good.

In the station-side apparatus of FIG. 11, for example, when MC unit 13B of # 1 fails and MC unit 13B is out of stock but general-purpose unit 14 is in stock, MC unit 13B from card slot 7 of # 1. , And insert the universal unit 14 instead.
Then, the general-purpose unit 14 may be temporarily or permanently used as the MC unit 13B by operating the general-purpose unit 14 # 1 as the MC unit 13B by the control signal from the management control unit 12.

[Other Modifications]
It should be understood that the embodiments disclosed herein are illustrative and non-restrictive in every respect. The scope of the present invention is shown by the claim, and it is intended that the meaning of a claim and equality and all the changes within the range are included.
For example, in the station-side apparatus 1 shown in FIG. 1 described above, the spare unit 14 is connected to any of the upper side ports i = 1 to N in the optical switch 15 and used as a substitute unit for the active unit 13. You may

  In this case, the management control unit 12 may transmit a control signal that causes the spare unit 14 to operate in one of PON communication and CPRI communication. In this way, the spare unit 14 can be used also as a working unit, which is an active system, so that the application of the spare unit 14 can be extended.

  In the above embodiment, the concentrator 11 may be omitted from the station-side device 1. That is, the line concentrator 11 may be provided on a communication device separate from the station apparatus 1 and installed on the upper side outside the station apparatus 1.

1 station-side device 2 opposing device 3 optical line 3A PON line 3B CPRI line 4 optical coupler 5 optical fiber 6 housing 7 card slot 11 concentrator 12 management control unit (control unit)
13 Optical Communication Unit (Current Unit, Dedicated Unit)
13A PON unit (OSU)
13B MC unit (BBU)
14 Optical communication unit (spare unit, general purpose unit)
15 Optical switch 16 Operation interface 17 Management network 18 Management device 21-i Upper fiber 22-j Lower fiber 23 Switch part (movable mirror)
Reference Signs List 24 optical coupler 25-j branch fiber 26 actuator 31 upper interface unit 32 PON control unit 33 reception processing unit 34 transmission processing unit 35 PON transmission / reception unit 36 control interface unit 37 upstream buffer 38 downstream buffer 41 upper interface unit 42 MC control unit 43 reception processing unit 44 transmission processing unit 45 MC transmission / reception unit 46 control interface unit 47 upstream buffer 48 downward buffer 51 upper side interface unit 52 general-purpose control unit 53 reception processing unit 54 transmission processing unit 55 shared transmission / reception unit 55A PON transmission / reception unit 55B MC transmission / reception Unit 56 Control interface unit 57 Up buffer 58 Down buffer 59 Optical coupler (optical branching device)
61 high-order selector 62 logic circuit field 63 low-order selector 64 PON area 65 MC area 71 PR field 72 reconfiguration unit 73 storage unit 75 adjustment unit

Claims (14)

An optical switch having a plurality of working ports and one spare port;
An optical communication unit optically connected to the working port, and a plurality of working units having different communication methods;
An optical communication unit optically connected to the spare port, wherein the spare unit is compatible with a plurality of types of communication methods;
A control unit that executes protection including a first control of connecting the spare port to the current port for switching source, and a second control for operating the spare unit according to the communication method of the current unit for switching source; A station-side device comprising The system further comprises a concentrator leading to an upper network, wherein the plurality of working units and the spare unit are electrically connected;
The station-side apparatus according to claim 1, wherein the protection includes a third control for instructing the concentrator to reset a communication path in accordance with the operation of the spare unit.   The station-side apparatus according to claim 1, wherein the control unit executes the protection in response to occurrence of a failure in the current unit.   The station-side apparatus according to any one of claims 1 to 3, wherein the control unit executes the protection in response to the reception of an execution command from an external apparatus in communication with the control apparatus. The spare unit can also be connected to the working port,
The station according to any one of claims 1 to 4, wherein the control unit operates the spare unit connected to the current port according to a predetermined communication method among the plurality of types of communication methods. Side device. An optical switch having a plurality of working ports and one spare port;
An optical communication unit optically connected to the working port, and a plurality of working units having different communication methods;
A protection method of a station side apparatus comprising: an optical communication unit optically connected to the spare port, the spare unit capable of supporting a plurality of types of the communication method; Connecting a spare port;
Operating the spare unit according to the communication method of the current unit as the switching source. An optical communication unit that communicates with an opposing device through an optical line,
An optical transmission / reception unit that performs transmission / reception of an optical signal transmitted to the optical line and mutual conversion between the optical signal and an electrical signal;
A communication circuit for receiving an electric signal from the light transmitting / receiving unit, transmitting an electric signal to the light transmitting / receiving unit, and performing information processing for communicating the electric signal with the opposite device Yes,
The optical communication unit, wherein the communication circuit is configured to be able to execute a plurality of types of the information processing based on different types of communication methods. The optical transmission / reception unit includes a plurality of types of optical transceivers corresponding to one type of the communication method,
The optical communication unit according to claim 7, wherein the plurality of optical transceivers are connected to an optical fiber leading to the optical line via an optical branching device. The optical transmission / reception unit includes one optical transceiver corresponding to a plurality of types of communication methods,
The optical communication unit according to claim 7, further comprising: an adjustment unit configured to adjust at least one of the light intensity and the light reception sensitivity of the optical transceiver for each type of the communication method. The communication circuit includes an FPGA,
The FPGA is
A logic circuit field including a plurality of logic circuit areas that execute the information processing respectively corresponding to different types of communication methods;
The optical communication unit according to any one of claims 7 to 9, further comprising: a selector for selecting the logic circuit area. The communication circuit includes an FPGA,
The FPGA is
PR field which is a logic circuit field capable of changing the connection structure of the logic block, and
A storage unit that stores setting information of the connection structure;
A reconfiguration unit configured to change the connection structure of the PR field so as to execute the information processing based on a predetermined communication method based on one setting information specified from among the stored setting information; And the optical communication unit according to any one of claims 7 to 9. The PR field is
The optical communication unit according to claim 11, wherein in the initial state before selection, the connection structure is set to execute the information processing based on a specific communication method. One or more card slots housed inside the housing;
A general-purpose unit that is an optical communication unit that can be installed in the card slot, and that can support a plurality of communication methods.
A control unit that executes control to operate the general-purpose unit according to a predetermined communication method among the plurality of types of communication methods. One or more card slots housed inside the housing;
A control method of a station side apparatus comprising: an optical communication unit attachable to the card slot; and a general-purpose unit compatible with a plurality of types of communication methods,
And controlling the general-purpose unit according to a predetermined communication method among the plurality of communication methods.

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