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RE: ? Resonant Frequency? RE: Interesting-One

"is the algorithm and criteria by which errors or lack of errors are assessed, and in respect of what?"

Fred, you are blowing smoke. You don't know what you are talking about. I do. I was personally responsible for the design of the data integrity features in Ethernet.

The error detection in Ethernet packet reception are specified by the IEEE project 802 standard. The algorithm involved is a 32 bit CRC that was originally developed by RADC. See reference 8 of the linked document, which was the original public Ethernet specification. The research Ethernet developed by Xerox PARC in the mid 1970's used a 16 bit CRC. One of the changes that I insisted on as the chief network architect at Digital Equipment was that the standard version use a 32 bit checksum. I personally selected this checksum and forced this decision into the agreement between DEC and Xerox by going to the the CEO of DEC and telling him that this was a non-negotiable technical change that was needed for a reliable system. This was conveyed by him to the CEO of Xerox. This caused a few ruffled feathers with some of the working level engineers at Xerox. Also, during this period there had been some email discussions between DEC and Xerox over the Internet and these ended up getting wiretapped and some stories appeared in trade press speculating about some local area network activity between DEC and Xerox some months prior to the announcement.

The Tl;dr is that perhaps one in four billion errors will go undetected. But you see that there probably won't be any errors to detect in the first place. Yes, it is a certainty that there will be (and probably have been) undetected errors considering the volume of data moved over Ethernets in past decades. But then there is also a chance that a large asteroid will extinguish most life on the planet earth. It has happened before.

Tony Lauck

"Diversity is the law of nature; no two entities in this universe are uniform." - P.R. Sarkar

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