NDLI: Estimating link availability and timing delays in ethernet-based networks

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Estimating link availability and timing delays in ethernet-based networks

Content Provider	ACM Digital Library
Author	Papa, Mauricio Nivethan, Jeyasingam Hawrylak, Peter J.
Abstract	Availability is an important requirement in networks used to control physical processes such as those present in the U.S. Critical Infrastructure, also known as Process Control Systems (PCS) or Supervisory Control and Data Acquisition (SCADA) systems. For instance, the IEC 61850 family of standards defines the network protocol for electric substations and the interface the substation presents to the Internet in the Smart Grid. Most of these networks currently use IEEE 802.3 Ethernet as opposed to legacy deployments using direct point-to-point connections that required a total of n * (n - 1)/2 connections, also known as the $n^{2}$ problem. IEC 61850 (and other industrial protocols) operate in an environment where messages must arrive in time to be processed and action taken by control equipment. Thus, this delicate network becomes a target for attackers that may attempt to delay message delivery to negatively affect availability and cause problems, possibly leading to a blackout or unsafe state of the system. Components and processes must be designed to handle delayed messages. This paper presents a theoretic model that can be used to estimate the round-trip-time of a message over Ethernet under different link loads. A discrete event simulator called OMNeT++ was used to build a simulation and validate the proposed model. Simulation results indicate that the model is accurate.
Starting Page	1
Ending Page	4
Page Count	4
File Format	PDF
ISBN	9781450316873
DOI	10.1145/2459976.2460029
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	2013-01-08
Publisher Place	New York
Access Restriction	Subscribed
Subject Keyword	Substation automation Security Network performance
Content Type	Text
Resource Type	Article

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