[LINK] RFI: Packet

[Chirgwin, Richard]

It's quite some time since Rink had a Framewar...

RC
(Sorry. Slow day. When Fed.gov.au suggests Alston for Telstra chairman and
nobody laughs...)

> -----Original Message-----
> From: Glen Turner [mailto:glen.turner at aarnet.edu.au] 
> Sent: Friday, April 16, 2004 12:35 PM
> To: Russell Ashdown
> Cc: link at anu.edu.au
> Subject: Re: [LINK] RFI: Packet
> 
> 
> On Fri, 2004-04-16 at 08:29, Russell Ashdown wrote:
> 
> > Drivel: RS-232 (or more correctly in Australia, V.24) is defined at 
> > the physical level (or layer one).  That level has no concept of a 
> > frame.
> 
> Oh dear.  The OSI protocol model is defined in ISO 7498-1
> (X.200).  That standard doesn't contain the word "frame",
> so I've no idea where you get the notion that the OSI model
> dictates that frames are constrained to any particular OSI
> layer.
> 
> The OSI Connectionless Mode requires the Link Layer to
> provide a Data-link-service-data-units service, but in
> the most abstract terms:
> 
>    The Data Link Layer allows exchange of
>    data-link-service-data-units over a data-
>    link-connection or exchange of data-link-
>    service-data-units (that bear no relation to any
>    other data-link-service-data-units) using the
>    connectionless-mode data-link-service.
> 
> Conversely, V.24 does use the word "frame", for the
> exact description I gave in my original e-mail.
> 
> And for once, I've got the US government on my side :-)
> http://www.its.bldrdoc.gov/fs-1037/dir-016/_2313.htm
> 
> Anyway, this is all pedantry.  There's the exact definition
> of a "frame" or a "packet" and then there's the highly
> convenient frame/packet/datagram/segment/PDU everyday
> usage of IP network engineers (which obviously breaks
> down under close examination, because it is only a
> convenience).  I'd gone to some lengths in my original
> e-mail to distinguish the two usages.
> 
> 
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