B8ZS is an abbreviation for Bipolar with 8 Zeros Substitution (or Binary Eight Zero Substitution)- which is a method of line coding used in the T-carrier system which allows full 64 Kbits per second per channel, though it does not allow for Clear Channel Capability (CCC - 64 Kbits/sec.) in and of itself. The service would still have to be point-to-point (PTP) band not switched through a digital switching network. The standard is to use B8ZS as the line encoding option when providing PTP circuits and services. The older scheme was implemented in channel cards that always robbed a bit for signaling regardless if the service on that channel was switched or P2P. B8ZS cards can be optioned not to rob that bit. Two Network Interface Units, one with a single card, the other with two In telecommunications, T-carrier is the generic designator for any of several digitally multiplexed telecommunications carrier systems originally developed by Bell Labs and used in North America and Japan. ...

On a T1, ones are sent by applying voltage to the wire, where a zero is sent by having no voltage on the wire. Sending excessive zeros in a row could cause receiving equipment to lose synchronization with sending equipment, so it is important that such a pattern not be sent. Digital signal 1 (DS1, also known as a T1) is a T-carrier signaling scheme devised by Bell Labs. ...

The original standard of line coding, AMI Alternate Mark Inversion, specifies that there are three states of the line, no voltage is a zero, positive voltage is a one (or mark), and negative voltage is also a one (or mark). Because of the inversion of the voltage for each "mark," or one, sent, the receiving equipment can easily determine the data rate of the line and not lose synchronization. Alternate Mark Inversion (AMI) is a line encoding technique (line code) for T1s which uses bipolar pulses to represent logical 1 values. ...

B8ZS builds upon this, by using violations of this rule to replace a pattern of eight zeros in a row.

B8ZS is used in the North American hierarchy at the T1 rate. E1 uses another method called High Density Bipolar Three (HDB3) code. To meet Wikipedias quality standards, this article or section may require cleanup. ... HDB3 (High-density bipolar-3 zeros) is a telecommunications line code mainly used in Japan,Europe and Australia (for example, in E-1 lines) and is based on AMI. It is also very similar to the B8ZS encoding used in T-1 lines. ...