Network monitoring device

• US 8,929,243 B2
• Filed: 02/22/2013
• Issued: 01/06/2015
• Est. Priority Date: 06/05/2012
• Status: Expired due to Fees

• Current Assignee: Hitachi, Ltd.
• Original Assignee: Hitachi, Ltd.
• Inventors: Takahashi, Shuhei, Ishii, Hideaki, Kurata, Ryosuke
• Primary Examiner(s): Lee, Jae Y
• Assistant Examiner(s): OH, ANDREW CHUNG SUK
• Application Number:
  US13/774,235
• Publication Number:
  US 20130322272A1
• Time in Patent Office: 683 Days
• Field of Search: None
• US Class Current: 370/252
• CPC Class Codes: H04L 12/2809 indicating that an appliance service is present in a home automation network monitoring functionality H04L43/0817; discovery or management thereof, e.g. service location protocol [SLP] or web services, H04L67/51
• CPC Class Codes: H04L 12/2823 Reporting information sensed by appliance or service execution status of appliance services in a home automation network device-related reporting H04L43/065; arrangements in telecontrol or telemetry systems for selectively calling a substation from a main station, in which substation desired apparatus is selected for applying a control signal thereto or for obtaining measured values therefrom H04Q9/00
• CPC Class Codes: H04L 12/2825 Reporting to a device located outside the home and the home network access arrangements H04L12/2856; for remote control or remote monitoring of applications H04L67/025; telephonic communication systems adapted for combination with telemetering systems H04M11/002
• CPC Class Codes: H04L 43/16 Threshold monitoring
• CPC Class Codes: H04L 67/025 for remote control or remote monitoring of applications
• CPC Class Codes: H04W 24/08 Testing, supervising or monitoring using real traffic
• CPC Class Codes: H04W 52/0232 according to average transmission signal activity
• CPC Class Codes: Y02D 30/70 in wireless communication networks

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.

Claims

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 communication device last receives or transmits traffic, and wherein the receiving unit records the second time;

and an arithmetic unit that subtracts the second time from the first time, compares a result of the subtraction with a first threshold for the communication device, and gives an alarm when the result of the subtraction exceeds the first threshold.

2. The network monitoring device according to claim 1, wherein for the communication device in which the alarm is being given, the arithmetic unit subtracts the second time from the first time, compares the result of the subtraction with a second threshold for the communication device, and suspends the alarm when the result of the subtraction falls below the second threshold.

3. The network monitoring device according to claim 2,

wherein the arithmetic unit preserves a maximum, value of the result of the subtraction;

and

for the communication device in which the alarm is suspended, the arithmetic unit corrects the first threshold on the basis of the maximum value.

4. The network monitoring device according to claim 3,

wherein the arithmetic unit preserves a plurality of recording sections of the maximum values according to an activity period of the communication device;

when the recording sections are changed, the arithmetic unit tentatively clears recorded maximum values; and

for the communication device in which the alarm is suspended, the arithmetic unit corrects the first threshold on the basis of a mean value of the plurality of maximum values.