24 Sep 1987 10:16-EDT
In the early days of digital voice, when T1 was invented, I recall
that every 8th bit of each 24 channel sequence (192 bits total) was
a 1 for signalling/sync purposes. That coding gave you only 56 kb/s
of digital information, but avoided any problems with regeneration.
Over time, the need for such signalling went down (after all, 1/8
of each channel was 8 kb/s which is a lot just for signalling).
It sounds as if the coding trinary coding scheme didn't account
for arbitrary data passing through repeaters. Sigh.
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