> Hi people,
> I am working on some home-grown PCI card with 1000 Base-X ethernet. My
> problem is that it fails on auto-negotiation step (against some Intel
> card). Getting it through the sniffer has shown that there are
> adverti*ts from both side, sometimes my card sets ACK bit, while the
> other side doesn't set ACK at all.
> A few questions:
> 1) Can somebody point me to some well-written (not the ieee standard,
> please) summary of AG process for fiber?
There is a discussion of automatic configuration for 1000BASE-X in
Chapter 12 of my book, "Gigabit Ethernet", available at:
Quote:> 2) Could it be that my TX signal is too weak? How can I measure it?
This is possible; you can measure the output level with an optical power
meter. If the cables are short, the optical power is not likely to be a
> 3) Can somebody explain me about SX/LX modes and their compatibilities
> Some system info:
> I use BCM2410s phy with OCP DTR-1250-MM-LS-AC-M tranceiver
I am not familiar with these particular components. As to compatibility,
you both ends MUST be using the same wavelength (either short-wave or
long-wave). Longwave will operate over either singlemode or multimode
fiber (shorter distance on multimode); short wave requires multimode
The automatic configurating algorithm can NOT resolve problems of either
wavelength or cable type; it assumes that the ends and cable are all
compatible. Automatic configuration ONLY resolves duplexity and flow
control, in 1000BASE-X.
Rich Seifert Networks and Communications Consulting
(408) 395-5700 Los Gatos, CA 95033
(408) 395-1966 FAX