2B1Q 4B3T B6ZS implementation?

2B1Q 4B3T B6ZS implementation?

Post by John Carl Stewie » Wed, 19 Mar 1997 04:00:00



Hi there,

I know 2B1Q, 4B3T, B6ZS are line coding schemes,
but could anybody tell me how they are implemented?

I already know the AMI scheme, i.e each 1 is represented
by a pulse of an opposite sign to the previous, and I
know how HDB3 works (MOOV, 000V, etc), but I don't
know about the above. Could somebody please clue me
in?

Regards John
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2B1Q 4B3T B6ZS implementation?

Post by Fred R. Goldste » Sat, 29 Mar 1997 04:00:00



Quote:

>Hi there,

>I know 2B1Q, 4B3T, B6ZS are line coding schemes,
>but could anybody tell me how they are implemented?
>I already know the AMI scheme, i.e each 1 is represented
>by a pulse of an opposite sign to the previous, and I
>know how HDB3 works (MOOV, 000V, etc), but I don't
>know about the above. Could somebody please clue me
>in?

B6ZS is like HDB3 in theory, just a different 6-bit pattern that replaces
6 consecutive 0's with a BPV pattern.  It's obscure; B8ZS is the norm for
clear channel over American T1 carrier.  (B6ZS is from T2, I think.  Almost
nonexistent.)

2B1Q is the NorAm standard for ISDN BRI loops and widely used worldwide.  It
takes two bits and encodes them as one symbol which can have one of four
levels.  There's scrambling to make it average near 0, of course.  The line
baud rate is thus 1/2 the raw bit rate.

4B3T is a German BRI loop technology.  It takes blocks of 4 bits and converts
them to three symbols, which like AMI have 3 possible states (+ 0 -). So the
line baud rate is 3/4 the raw bit rate.

--
Fred R. Goldstein   k1io    fgoldstein"at"bbn.com
BBN Corp., Cambridge MA  USA         +1 617 873 3850
Opinions are mine alone; sharing requires permission.

 
 
 

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