Network monitoring device

Patent metadata

Field	Value
Publication number	US-8929243-B2
Application number	US-201313774235-A
Country	US
Kind code	B2
Filing date	Feb 22, 2013
Priority date	Jun 5, 2012
Publication date	Jan 6, 2015
Grant date	Jan 6, 2015

Abstract

A zero traffic state that is a non-communication state derived from any fault is discriminated from a no-operation state derived from, power discontinuity, and a communication device that is in the zero traffic state is efficiently sensed in consideration of a zero traffic period that is normally observed in a certain installation place or use environment. A network monitoring device cyclically notifies a maintenance person of a communication device, for which a time difference between a final access time and a finally passed traffic generation time exceeds a threshold calculated by multiplying a previously observed maximum, value of the time difference between the final access time and the finally passed traffic generation time by a coefficient that is a safety factory as a device that is In a zero traffic suspected state.

First claim

What is claimed is:

1. A network monitoring device connected to communication device over a network, comprising:
a recording unit which records a first time, wherein the first time is a time at which the monitoring device receives a periodically transmitted notification from the communication device;
a receiving unit that periodically receives the notification, which contains a second time, from the communication device, wherein the second time is the most recent time when the c…

Assignees

• Hitachi Ltd

Inventors

• Kurata Ryosuke
• Takahashi Shuhei
• Ishii Hideaki

Classifications

• H04W52/0232

  Electricity · mapped topic

• H04L43/16

  Electricity · mapped topic

• H04L67/025

  Electricity · mapped topic

• H04L12/2809

  Electricity · mapped topic

• H04W24/08 Primary

  Electricity · mapped topic