* OSI on PCs revisited
@ 1991-02-01 17:07 Markus Kuhn
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From: Markus Kuhn @ 1991-02-01 17:07 UTC (permalink / raw)
Some days ago, I asked here about possibitilies for
OSI connections on asynchronous/start-stop RS-232 lines.
There seems to be some interest in this topic. I got
some suggestions:
1. H.T.Alvestrand suggested me to check X.32 in the CCITT
Blue Book. I did this. Unfortunately this recommendation
says only something about synchronous modes on the
V.24 (= RS-232) interface. The other modes are "for further
study" (section 4.3.1). Perhaps they intend to use the
new HDLC start-stop mode as a further option in the '92 version.
2. Tim Clark reported that in the UK acedemic community, a protocol
called ATS is used to convert LAP-B in an asynch protocol.
3. Micheal Roe reported that there is a standard in the TCP/IP
world called 'Serial Line IP' that does exactly what I want.
So I could run X.25 over TCP/IP.
He also suggested to modify LLC-1 (also a HDLC subset) for
asynchronous lines in the same way, HDLC does this.
This would be the connectionless alternative to my own
suggestion of an asynch LAP-B.
As I personally prefer X.25, I think, I will implement LAP-B.
But the idea of using LLC-1 sounds also quite interesting
to me. Unfortunately, ATS and Serial Line IP aren't pure OSI so
I don't like them so much. Thank you for your answers.
Any further suggestions?
Has anyone information about the HDLC start-stop mode
(frame format, transparency, etc.)?
Is anyone planning to implement something like this?
Especially in ISODE (would be great)?
Markus Kuhn
CS student
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