# US 9,439,160 B2 · Network management system

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- Number: US 9,439,160 B2
- Document ID: US9439160B2
- Status: Granted
- Kind: B2
- Application number: 14/343,145
- Filed: 2013-06-21
- Published: 2014-08-21
- Granted: 2016-09-06
- Earliest claimed: 2012-06-29
- Assignees: Yokogawa Electric Corporation
- Applicants: Yokogawa Electric Corporation
- Inventors: Masahito Endou
- Web page: https://patentgrep.com/patent/US9439160B2

## CPC

- H04W 56/001: {Synchronization between nodes}
- H04J 3/0638: {Clock or time synchronisation among nodes; Internode synchronisation (synchronization for ring networks H04L12/422; data switching networks with synchronous transmission H04L12/43)}
- H04L 12/40182: {by using a plurality of communication lines}
- H04W 24/04: Arrangements for maintaining operational condition
- H04W 84/12: WLAN [Wireless Local Area Networks]
- H04J 3/0652: {Synchronisation among time division multiple access [TDMA] nodes, e.g. time triggered protocol [TTP] (bus network with centralized control in which slots are of a TDMA packet structure H04L12/4035)}
- H04L 2012/4026: {Bus for use in automation systems}
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)
- H04J: MULTIPLEX COMMUNICATION (transmission in general H04B; peculiar to transmission of digital information H04L5/00; systems for the simultaneous or sequential transmission of more than one television signal H04N7/08; in exchanges H04Q11/00; stereophonic systems H04S)
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)

## Abstract

It is to realize a network management system excellent in its reliability which can prevent a wrong connection when a field wireless management station having a redundant structure is installed, and can make a backbone network redundant so as to improve a trouble resistance. In a network management system in which filed wireless management stations having gateway functions and system management functions incorporated are redundantly connected together, the plurality of field wireless management stations 11, 12 are connected to each other through a synchronizing cable 30 and synchronizing connectors Can, CNb provided in the synchronizing cable 30.

## Claims

### Claim 1

A network management system in which field wireless management stations having gateway functions and system management functions incorporated are redundantly connected together,
wherein the plurality of field wireless management stations are connected to each other through a synchronizing cable and synchronizing connectors provided in the synchronizing cable, the respective synchronizing connectors for the field wireless management stations being physically configured different from each other,
wherein the synchronizing connectors comprise a first connector for directly connecting to a first of the plurality of field wireless management stations and a second connector for directly connecting to a second of the plurality of field wireless management stations, and
wherein the synchronizing cable provides a physical connection between the first connector and the second connector.

### Claim 2 (depends on 1)

The network management system according to claim 1, wherein that the plurality of redundantly connected field wireless management stations are connected so as to be individually identified by the synchronizing cable and the synchronizing connectors.

### Claim 3 (depends on 1)

The network management system according to claim 1, wherein the synchronizing cable and the synchronizing connectors also include a power wire.

### Claim 4 (depends on 1)

The network management system according to claim 1, wherein it is detected whether the synchronizing cable and the synchronizing connectors are pulled out from or inserted into at least one of the field wireless management stations in accordance with a function which individually identifies the plurality of redundantly connected field wireless management stations by the synchronizing cable and the synchronizing connectors.

### Claim 5 (depends on 1)

The network management system according to claim 1, wherein each of the synchronizing connectors are configured to short circuit distinct combinations of wires of the synchronizing cable.

### Claim 6 (depends on 1)

The network management system according to claim 1, wherein the plurality of field wireless management stations each comprise a pin identifier configured to detect a short circuit signal.