[nsp] 100Mb Ethernet Design Rules - Propagation delay

[sthaug at nethelp.no]

> RE: Calculating acceptable propagation delay within a collision domain.
> 
> According to one of my references, if I exceed the max propagation delay of 5.12 microseconds or 512 bit times (on 100Mb Ethernet), I'm at risk of experiencing late collisions and/ or CRC errors.
> 
> Does this apply to links configured as full duplex?

No. There are no collisions on full duplex links.

> If it does not apply, what is my design constraint regarding distance in a full duplex configuration?

Still the same, 100 meters. The main problem with 100 Mbps Ethernet is
the signal degradation in the TP cable. Full duplex does nothing to fix
this.

Steinar Haug, Nethelp consulting, sthaug at nethelp.no