How does the receiver recover the b8ZS bit sequences to it's original bit sequence?

Answer 1

A device optioned for B8ZS (Bipolar 8-Zero Substitution) inserts a bipolar violation into any frame containing 8 zeroes in a specific sequence during transmission of that frame. The device at the receiving end simply looks for that specific sequence and changes the bit sequence in that frame back to 8 zeros.

For a more complete understanding, it's important to also understand Alternate Mark Inversion (AMI) Line Coding and what a Bipolar Violation means. AMI Line Coding means that each digital '1' bit (also referred to as a 'Mark') uses alternating positive and negative voltage pulses to represent those bits, even if those '1' bits are separated by '0' bits. A Bipolar Violation is when two consecutive '1' bits voilate that AMI rule. Since a DS1 signal depends on a certain level of 1's density to maintain receive synchronization, long strings of '0's can cause timing slips. To prevent this, when a frame containing 8 zero's is transmitted, B8ZS changes bits 4, 5, 7 and 8 into 1's, but bits 5 and 7 will either both be positive or both negative, causing the specific bipolar violation that a receiving device optioned for B8ZS is looking for, and it will change those four bits back to 0's. One other point - B8ZS only comes into play when an 8-bit frame containing all 0's occurs. So, B8ZS isn't really different from AMI, it's more like an enhancement to AMI, with a special condition that only occurs when an all-0's frame is encountered.