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[ax25-layer2] Re: EDAC vs HDLC

Barry White bewhite at bigpond.net.au
Sat Aug 5 02:13:58 UTC 2006


Well, it depends where you draw the line. Afterall HDLC chips are 
hardware and can be called level 1.
It does not matter really, level 2 needs error detection and correction 
for the reasons I mentioned earlier. Especially in emergencies the 
simplest system is a requirement.

73 Barry VK2AAB

Samuel A. Falvo II wrote:

> On 8/4/06, Glenn Thomas <glennt at charter.net> wrote:
> 
>> I think the main issue here is whether or not we ought to include
>> data integrity in the ISO level two description. To be sure, data
> 
> 
> ISO declares this the job of layer 1 -- the physical layer.  However,
> there are only so many things you can do at layer 1 to ensure reliable
> links.  That's why layer 2 recognizes that layer 1 is fallible, and
> requires the frame check sequence.
> 



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