The DNBI/DNBT, among other things, handles the switching between the redundant
nodebus segments. Your DNBI/DNBT actually connects to the AW/WP via an ethernet
card (the DNBI also uses a serial port, I presume for the switching and other
types of data; the DNBT does it all "in-band" over the ethernet connection).
The packets going out le0/hme0 on the AW/WP, through the DNBI/DNBT, and out on
the nodebus, probably conform to 802.3.
Actually, 802.3 is an old standard in itself. It is not used any more on modern
networks, because IIRC, it doesn't allow multiple protocols (e.g., IP and IPX)
to traverse the wire simultaneously. This is not an issue with the nodebus,
obviously.
Corey Clingo
Sr. Engineer
BASF Corporation
Hi All,
In all Foxboro documentation, there is a differentiation between Ethernet and
NodeBus. However, Foxboro states clearly that NodeBus is according to IEEE 802.3
standard. This implies that you can connect AW or WP directly through an
Ethernet card. so, why using DNBI !!!!. the only difference between old Ethernet
and IEEE 802.3 standard I know is in the "type" field in the frame structure and
all new Ethernet cards are according to IEEE 802.3 Standard. So, what is realy
the difference??.
Regards
Ashraf Tantawy
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