🚀 go-pugleaf

In article <CMM.0.88.665054845.jon@gode.ifi.uio.no> jon@ifi.uio.no (Jon lnes) writes:
>In this case one DTE is required to act as a DCE for channel number
>allocation - which one is determined from the RESTART procedure.

Also note that this procedure is found exclusively in ISO8882; X.25(1984) does
not consider DTE-DTE operation at all. And, according to ISO 8208 Addendum 3,
this procedure is optional. I don't like it for the reason Jon mentioned: in
the case of Restart collision (which for most equipment happens every time
frame level is established), you can theoretically get into a race. ISO says
to use a "randomly chosen time delay" for retransmitting the Restart. Random?!
Sure.... Better to just hard-configure one of the DTEs as a DCE. And in fact,
ISO recommends this as preferable, in fine print after the specification for
the auto-selecting Restart procedure.

(Actually, the ISO "X.25" documents contain a number of extensions like this
that just aren't a very good idea. Setting T1 on REJ frames, for example.)

<csg>