# US 2022/0045751 A1 · Monitoring device

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- Number: US 2022/0045751 A1
- Document ID: US20220045751A1
- Status: Published application
- Kind: A1
- Application number: 17/312,140
- Filed: 2019-12-03
- Published: 2022-02-10
- Earliest claimed: 2018-12-17
- Assignees: Nippon Telegraph and Telephone Corporation
- Applicants: Nippon Telegraph and Telephone Corporation
- Inventors: Yoshitaka ENOMOTO; Hideo KAWATA; Kazuhisa FURUSAWA
- Web page: https://patentgrep.com/patent/US20220045751A1

## CPC

- H04B 10/077: using a supervisory or additional signal
- H04B 10/0775: {Performance monitoring and measurement of transmission parameters}
- H04B 10/27: Arrangements for networking
- H04L 12/44: Star or tree networks
- H04B: TRANSMISSION
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)

## Abstract

An object is to provide a monitoring device capable of acquiring ONU-specific information and connection information even in the case of an optical communication system with the MC system, and enabling optical fiber cable switching work to be finished in a short time. The monitoring device according to the present invention is a monitoring device that monitors an optical communication system in which an OLT and an ONU are connected by a communication optical fiber, and includes: an optical receiver for receiving a signal beam transmitted by the ONU from the communication optical fiber; and an OAM frame analysis unit for extracting, from the signal beam received by the optical receiver, an OAM frame at a MEG level at which the ONU and the OLT are set as monitoring end points, and acquiring a transmission source address and a MEG-ID that identifies a MEG in the OAM frame.

## Claims

### Claim 1

A monitoring device that monitors an optical communication system in which an optical line terminal (OLT) and an optical network unit (ONU) are connected by a communication optical fiber, comprising: an optical receiver for receiving a signal beam transmitted by the ONU from the communication optical fiber; and an OAM frame analysis unit for extracting, from the signal beam received by the optical receiver, an OAM (Operation Administration and Maintenance) frame at a MEG (Maintenance Entity Group) level at which the ONU and the OLT are set as monitoring end points, and acquiring a transmission source address and a MEG-ID that identifies a MEG in the OAM frame.

### Claim 2 (depends on 1)

The monitoring device according to claim 1 further comprising: a storage unit for storing the transmission source address and the MEG-ID acquired by the OAM frame analysis unit; and a determination unit for comparing, at a point in time, the transmission source address and the MEG-ID acquired by the OAM frame analysis unit with the transmission source address and the MEG-ID stored in the storage unit, and determining a state of the optical communication system.

### Claim 3 (depends on 2)

The monitoring device according to claim 2, wherein the determination unit determines that the ONU has been incorrectly connected if the transmission source address does not match before and after the point in time, and determines that the OLT has been incorrectly connected if the MEG-ID does not match before and after the point in time.

### Claim 4 (depends on 1)

The monitoring device according to claim 1, further comprising a signal type determination unit for detecting a MAC frame in the signal beam received by the optical receiver, determining a type of the optical communication system based on a preamble of the MAC frame, and transferring the signal beam to the OAM frame analysis unit if the optical communication system is of a point-to-point type.