Your description is most likely much more technically correct.
The end result is latency or decreased throughput.
My only exposure to interleaving was seat of the pants description of the
process used in MFM hard drives of the 80s.
In the end, the fact that does result in slower printing speeds due to
increased latency is the most important thing to remember.
FWIW, my seat of the pants relating FEC to redundancy would probably not
pass muster in the technical arena either :) . I have always equated FEC
with sending multiple instances of the same information, which the receiving
station must reassemble multiple instances of verification before printing
the data to the screen. In the case of MT-63, (If I remember correctly) the
authors say that up to a 25% loss of redundancy will not affect accurate
copy. I am sure that there is a more factual way to present the process,
but the concept of redundancy and verification through redundancy seems to
be easier to comprehend to those using and not writing the software.
At any rate, it is good to see more folks showing an interest in this mode
of operations. I used it on a net this morning to quickly copy 4 pieces of
traffic, and the receive screen gave me a way to cut and past forward them
by altrernate means in very short order.
] On Behalf Of Hamish
Sent: Monday, December 31, 2007 1:15 AM
Subject: Re: [MT63] What is MT63 good for?
On Sat, Dec 29, 2007 at 11:19:12PM -0500, dalite01@bellsouth.
<mailto:dalite01%40bellsouth.net> net wrote:
> It takes some work to get a good working understanding of the mode.
> Watching 2 KHz long MT-63 sending a multi page message is incredible; when
> conditions permit.
> Interleave helps determine how often the software attempts to extract
> data from the data stream.
> Longer gives more time between extraction of data at a sacrifice of speed.
> Shorter will attempt to get more data in any given time period, but may
> be suitable for slower processors.
Err, really? This sounds more like the coding rate, which is a measure
of how much of the raw bitrate is used for FEC and how much is used for
Interleaving typically refers to the process of rearranging
the bits after the forward error correction is inserted, and rearranging
them back before recovery. Errors typically occur in bursts; by
rearranging the bits you distribute the errors so that the FEC can
correct them (while it couldn't correct a whole burst of errors
The disadvantage of interleaving is that it adds latency.
Hamish Moffatt VK3SB <hamish@debian. <mailto:hamish%40debian.org> org>
<hamish@cloud. <mailto:hamish%40cloud.net.au> net.au>
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