Re: [RE] Latencies through RE cables
David-
The cable latency is less than or equal to 570 ns/100 meter link (one way).
This is a well established number within 802.3 and cabling standards.
This is based on the 5.7 ns/m figure that is in 10BASE-T (ref: 14.4.2.4)
The higher speed links are slightly faster.
Geoff
At 12:14 PM 4/26/2005 -0800, David V James wrote:
>All,
>
>Things seem to have been quiet for the last week.
>Perhaps I could stimulate some discussions on
>cable latencies?
>
>I believe Alexei's presentations have claimed that
>interactive latencies of 15ms are nearly audible.
>
>Since the link delays are only part of the delay
>equation, this has led some of us to believe that
>(worst case) per-hop latencies should not exceed
>0.5ms. (This number is much more than the speed
>of light, since it includes buffer and conflict
>delays.)
>
>Is there any controversy with using this as a
>working per-hop maximum delay number?
>
>For background material on this topic, please
>reference pages 15-17 of the following
>working paper:
>
> http://groups.yahoo.com/group/REInterestGroup/files/
> The paper is listed as dvjRePaper2005Apr26.pdf
>
>I have spent the last week accumulating content
>of various slide presentations into the above
>listed working paper. Hopefully this will be helpful
>when considering this and other issues.
>
>DVJ
>David V. James
>