Mariusz SP3FXC wrote:

Moebius Velcro wrote:

Mariusz SP3FXC wrote:
I'm looking for some info on NRZI coding. google gives me useless
links... nothing special. I am about to write someting that uses NRZI but
i can not find any specification.

If you look at this with a monospaced font (Courier for example) it
should make sense:

__ ________ _____ __
__| |__| |__| |________|
0 0 0 1 1 0 0 1 0 1 1 0

Non-Return Zero Inverting means (1) the signal does not return
to a resting state after a bit, and (2) a zero is indicated by
a change of state, and a one by no change. Clock is extracted
from the data, which means there must be a limit to the number
of consecutive 1's, and the "zero stuffing" technique leads to
a bigger discussion.

HTH

Very good One more question. Is it "level-sensitive" coding? I mean if we
change the phase (by 180deg.) of NRZI coded signal would it be still
readable when it hits decoder? I need to verify this because it is
essential for my project.

No.

__ ________ _____ __
__| |__| |__| |________|

means the same as
__ __ __ ________
|__| |________| |_____| |__

in that a zero is represented by a change, in either direction,
and a one is no change.

;B

Ok.
Thank You ALL very much for helping me. The input from You was very
helpfull.

Best regards from Poland, 73's,

Mariusz SP3FXC

Ok.
Thank You ALL very much for helping me. The input from You was very
helpfull.

Best regards from Poland, 73's,

Mariusz SP3FXC