JP2009027518A - Communication failure detection system and its method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a communication failure detection system and its method which can acquire failure factor information simply and accurately from a subscriber local terminal only by function expansion of an optical network unit (ONU), without requiring a considerable change in an optical multiple branch communication system. <P>SOLUTION: The invention includes a CPU function section 107 in which input/output signals of respective branch optical lines 11a<SB>1</SB>to 11a<SB>n</SB>optically branched from a communication provider station 1 to respective ONUs 12a<SB>1</SB>to 12a<SB>n</SB>in subscriber houses 15a<SB>1</SB>to 15a<SB>n</SB>are detected by an ONU input/output light monitoring section 106 and the states of the respective branch optical lines 11a<SB>1</SB>to 11a<SB>n</SB>thus branched are judged based on the detected input/output signals so as to output judgement information to a local terminal 14a<SB>1</SB>according to a request from the local terminal 14a<SB>1</SB>. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a system for realizing a service using an optical fiber, for example, FTTH (Fiber To The) such as a GE-PON (Gigabit Ethernet (registered trademark) -Passive Optical Network) system and a B-PON (Business-PON) system. The present invention relates to a communication failure detection system and a communication failure detection method when a communication failure occurs in an optical multi-branch communication system realizing a service.

  FIG. 4 shows an optical multi-branch communication system in which one OLT (Optical Line Terminal) installed in a station such as a GE-PON system and a B-PON system realizing FTTH service is shared by many users. It shows a general configuration.

In FIG. 4, an OLT 3 installed in the telecommunications carrier station ₁ and an ONU (Optical Network Unit) 12 a ₁ installed in the subscriber home 15 a ₁ are connected via an optical coupler 10. The optical coupler 10, a trunk optical path 9 and the branch optical line _11a 1 ～11A _n 1 pair and n connection makes it possible to share a single OLT in a number of ONU.

In this optical multi-branch communication system, when an abnormality occurs in an optical fiber or an optical communication device as an optical line medium as shown in FIG. 5 and the OLT 3 and the ONU 12a ₁ are in a communication disabled state, the communication carrier station 1 side using OTDR (optical Time Domain Reflectometer) 5 , and outputs the monitor light from OTDR5, analyze the monitoring light returned from the ONU12a ₁ ~ONU12a _n, certain extraordinary light path, it is possible to detect the abnormal portion ( For example, see Patent Document 1).

Further, it is possible to confirm the operation immediately before by acquiring the control terminal 4 of the OLT 3, alarm ONUs 12a ₁ which is connected to the optical line that generated the anomaly, the state information.

Japanese Patent Laying-Open No. 2005-192138 (stages 0020 to 0022, FIG. 1)

However, in the conventional communication failure detection system, analysis from the telecommunications carrier station 1 side is possible, but from the subscriber home 15a ₁ side, it is only possible to detect disconnection of the optical line, failure analysis There was a problem of lack of information to implement. Further, a failure of the ONUs 12a ₁ inadvertent accidental failure or subscriber ONUs 12a _1, even if the optical I / F becomes one only abnormal, the operators station building 1 side there is a problem that can not be analyzed .

Also, when the ONU 12a ₁ is newly installed, the telecommunications carrier station 1 side can only monitor and analyze after the ONU 12a ₁ is connected, and the subscriber's home 15a ₁ is outputting light from the optical fiber. However, there is a problem that it is difficult to determine whether the connection destination device of the optical line is the target system.

  Furthermore, if similar optical multi-branch communication systems are developed in the future, there is an advantage that the optical line can be reused by exchanging the station side equipment and subscriber side equipment, but at the same time it is connected to the target system. There has been a problem that it is difficult to determine whether or not it is present. In addition, there is a problem that it is difficult to determine the cause, for example, when the newly installed ONU is not connected to the target system but the LED does not light due to an accidental failure during transportation.

  The present invention has been made to solve the above-described problems, and does not significantly change the optical multi-branch communication system. By expanding the function of only the ONU, failure factor information from the subscriber-side local terminal is provided. It is an object of the present invention to provide a communication failure detection system and method capable of easily and accurately acquiring a message.

  A communication failure detection system according to the present invention includes a branching unit that branches a plurality of optical lines from a master station device to a slave station device, and an optical monitoring unit that detects each input / output signal of the branched optical line from the branching unit. And a control unit that determines a connection state of the branched optical line with the master station device based on each input / output signal detected by the optical monitoring unit, and outputs a determination result in response to a request from the external terminal. It is a thing.

  A communication failure detection method according to the present invention includes a step of detecting each input / output signal of a plurality of optical lines branched from a master station device to a slave station device, and a branched optical line based on each detected input / output signal Determining a connection state with the master station device, and outputting a determination result in response to a request from an external terminal.

  According to the present invention, the status of the ONU can be confirmed from the local terminal side by the optical monitoring unit via the control unit, and the amount of information is increased by acquiring the failure factor from the ONU side at the time of the failure occurrence. It is possible to improve the efficiency of factor analysis surveys. In particular, it is possible to improve the efficiency of analysis when a problem occurs when installing a new ONU, and to shorten the installation work time.

  In addition, by acquiring information from the local terminal, it is possible to improve the accuracy of obtaining necessary information and to reduce unnecessary operations due to erroneous operations. Furthermore, even when a similar optical multi-branch system is developed in the future, it is possible to reuse the optical line by exchanging the station side device and the subscriber premises side device, and to reduce errors. .

Hereinafter, various embodiments of a communication failure detection system according to the present invention will be described with reference to the drawings.
Embodiment 1 FIG.
FIG. 1 is a block diagram showing a configuration of an optical multi-branch communication system using the communication failure detection system according to the first embodiment of the present invention.

In FIG. 1, an optical multi-branch communication system is installed in a communication carrier station 1 and an optical line monitoring function unit 8 is attached to an OLT 3 connected to an IP network via a UTP (Unified Twist Pair Cable) cable 2. trunk optical line 9 is connected, the trunk optical path 9 is an optical multi-branched in the branch optical line _11a 1 _{~11a n} by the optical coupler 10.

Light multibranched each branch optical line _11a 1 _{~11a n} are are connected to each ONU12a ₁ ~12a _n customer premises _15a within 1 to 15A _n. The optical line monitoring function unit 8 is a functional unit for monitoring each optical line from the telecommunications carrier station 1 side. The control light from the OTDR 5 is output-controlled by the control unit 6, and via the FS (Fiber Selector) 7, The light is emitted to the main optical line 9, the reflection from each optical line is measured, and the failure detection and analysis of each optical line are performed.

ONUs 12a ₁ in subscriber homes 15a _1, the optical connector 101, an asymmetric branching coupler 102, optical input-output terminal portion 103, the main signal processor 104, LAN connector 105, ONU output light monitoring section 106 of the optical monitoring section, A CPU function unit 107 as a control unit is provided. Subscriber is used to implement the communication with the IP network by connecting the local terminal 14a ₁ or home LAN, such as a PC, via UTP cable 13a ₁ to the LAN connector 105 of the ONUs 12a _1.

FIG. 2 shows a block diagram of a detailed functional configuration of the ONU 12a ₁ in the subscriber home 15a ₁ . The ONU input / output light monitoring unit 106 is a WDM (Wavelength Division Multiplexing) coupler 108 that inputs / outputs the input / output light, an O / E conversion unit A 109a that converts the output light into an electrical signal, and monitors the input light. For this purpose, an O / E converter B109b, an A / D converter A110a and an A / D converter B110b for enabling the CPU function unit 107 to recognize an analog signal obtained by electrically converting input light / output light are provided.

CPU functional unit 107, the alarm processing control and ONUs 12a ₁ of the main signal processing unit 104 performs state monitoring, outputs to the local terminal 14a ₁ on demand (command) from the function and the local terminal 14a ₁ informs the OLT3 It has a function.

When an abnormality occurs in the optical line as shown in FIG. 4, the OLT 3 and the ONU 12a ₁ fall into a communication disabled state. In this case, since the status cannot be notified to the OLT 3, the subscriber or the construction worker who visited the subscriber home 15 a ₁ confirms the status of the ONU 12 a ₁ by accessing the CPU function unit 107 with the local terminal, and the mobile phone By contacting the communication carrier using another communication means, etc., it is possible to perform a more accurate failure analysis in cooperation with the communication carrier performing analysis from the communication carrier station building 1 side.

The status information of the ONU 12a _{1 that} can be acquired from the local terminal 14a ₁ includes the optical output monitoring A / D conversion unit A 110a and the optical input monitoring A / D conversion unit B 110b for determining the presence or absence of physical connection. Optical input / output information, control frame transmission / reception information from the main signal termination unit 104 for confirming whether it is connected to the target system, and internal counter information.

As described above, in the first embodiment, the ONU input / output light monitoring unit 106 can check the state of the ONU 12a ₁ from the local terminal side via the CPU function unit 107. The failure factor can be obtained, the amount of information increases, and the failure factor analysis survey can be made more efficient. In particular, it is possible to improve the efficiency of analysis when a problem occurs when installing a new ONU, and to shorten the installation work time.

  In addition, it is possible to improve the accuracy of obtaining necessary information and to reduce unnecessary operations due to erroneous operations. Furthermore, even when a similar optical multi-branch system is developed in the future, it is possible to reuse the optical line by exchanging the station side device and the subscriber premises side device, and to reduce errors. .

Embodiment 2. FIG.
FIG. 3 is a block diagram showing the configuration of the ONU 200 in the communication failure detection system according to the second embodiment of the present invention. The ONU 200 is a special-purpose ONU specializing only the ONU 12a ₁ in the communication failure detection system of the _first embodiment to specify a received signal from the optical line.

The ONU 12a ₁ is connected to the branch line optical line 11a ₁ that is input from the outside, and is branched into the ONU optical line 202a and the ONU optical line 202b by the ONU optical coupler 201 in the ONU 200.

  The ONU optical line 202a and the ONU optical line 202b are connected to a high-speed compatible O / E converter A203 and a low-speed compatible O / E converter B204, respectively, as optical monitoring units, and receive signal discrimination functions as control units, respectively. Input to the unit 205.

  The received signal discriminating function unit 205 is a frame specific to each system such as the GE-PON system and the B-PON system while changing the sampling rate for the received signals from the O / E converter A 203 and the O / E converter B 204. Search for a format. When a match to the frame format unique to each system is detected, the LED corresponding to the system in the LED unit 207 is turned on.

In addition, a function for holding the matching information at the same time receiving the signal discrimination unit 205, in response to the information acquisition request from the local terminal 14a ₁ which is connected via a serial connector 206 and the serial cable 208 to the ONU 200, the reception signal discriminated The function unit 205 has a function of outputting to the local terminal 205 information regarding the connection system acquired by the function unit 205, the matched frame format, the number of matches, and the period.

  As described above, in the second embodiment, since the received signal discrimination function unit 205 detects the frame format, it is possible to recognize what kind of system it is connected to, and to further increase the efficiency of the failure factor analysis investigation. The effect is obtained.

1 is a block diagram illustrating a schematic configuration of a first embodiment of an optical multi-branch communication system including a communication failure detection system according to the present invention. It is a block diagram which shows the structure of Embodiment 1 of the communication failure detection system which concerns on this invention. It is a block diagram which shows the structure of Embodiment 2 of the communication failure detection system which concerns on this invention. It is a block diagram which shows schematic structure of the optical multi-branch communication system provided with the conventional communication failure detection system. It is a figure which shows the operation | movement at the time of abnormality generation of the optical multi-branch communication system provided with the conventional communication failure detection system.

Explanation of symbols

1 operators station building 9 trunk optical path 10 the optical coupler _11a 1 _{~11a n} branch optical line _12a 1 _{~12a n} ONU
14a ₁ Local terminal 106 ONU input / output light monitoring unit 107 CPU function unit 200 ONU
205 Received signal discrimination function

Claims (3)

A branching unit that branches a plurality of optical lines from the master station device to the slave station device;
An optical monitoring unit for detecting each input / output signal of the branched optical line from this branching unit;
A control unit that determines a connection state of the branched optical line with the master station device based on the input / output signals detected by the optical monitoring unit and outputs the determination result in response to a request from an external terminal And a communication failure detection system.   The communication failure detection system according to claim 1, wherein the control unit includes a function of determining a type of a frame format based on a signal detected by the optical monitoring unit. Detecting each input / output signal of a plurality of optical lines branched from the master station device to the slave station device;
Determining a connection state of the branched optical line with the master station device based on the detected input / output signals;
A communication failure detection method including a step of outputting the determination result in response to a request from an external terminal.

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