On Dec 18, 0:37, pete_at_mindy wrote:
> "101100" at 1200, you'll see it's actually a Manchester code:
>
> __ _____ __ __ _____
> | |__| |__| |__| |_____| |
>
> --1-- --0-- --1-- --1-- --0-- --0--
Oops, I take that back :-) Although the Sorcerer manuals describe it as a
Manchester encoder/decoder, what it puts on the tape is FSK. I just
checked the schematic and circuit description.
Dwight hasn't exactly described Manchester encoding either, though.
Manchester encoding puts the clock transition in the *centre* of each
cell, and the polarity of the transition determines whether it's a 0 or a
1. There's a phase shift at the cell boundary if necessary. His diagram
*could* be Manchester encoding if you shift the 0s and 1s slightly to the
left, except for the last bit. It should be (maybe 'd' for "down" and 'u'
for "up" makes it more obvious):
___ _ ___ _ ___
|___| |_| |_| |___|
-0- -1- -1- -0- -0- -1-
d u u d d u
It's too late at night here, for any more of this :-)
--
Pete Peter Turnbull
Network Manager
University of York
Received on Tue Dec 17 2002 - 19:33:00 GMT