At 03:20 PM 12/22/01 +0000, Alan Cox wrote:
>It gets worse the deeper you go. Over an HDLC based link for example
>sequences of five one bits take longer to send due to bitstuffing. Any
>networking terminology is generally grossly simplified.
Interestingly, the subject of bit-stuffing came up during the discussion of
modem testing, because of the HDLC framing used in V.42 error
control. Statistics provided by the representative from Hayes (R.I.P.)
showed that bit-stuffing occurred in roughly 1 out of 64 bits in the data
path when V.42 bis data compression was enabled. The 1:63 ratio held over
a surprisingly wide range of data patterns, all the way from repeated
single characters through text in English, French, German, and Chinese to
the output of a 64-bit random number generator. When v.42 bis data
compression was disabled, the average ratio was about the same but there
was considerably more spread because of data pattern sensitivity.
Which is grossly off-topic but I thought a few of you might be interested.
Stephen Satchell
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This archive was generated by hypermail 2b29 : Sun Dec 23 2001 - 21:00:27 EST