B8ZS is an abbreviation for Bipolar with 8 Zeros Substitution (not Binary Eight Zero Substitution, see discussion)- which is a method of line coding used in the T-carrier system which allows full 64 kilobits per second per channel, though it does not allow for Clear Channel Capability (CCC - 64 kbit/s) 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 method 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.

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.

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.

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.

Wikimedia Foundation. 2010.

Нужно решить контрольную?

Look at other dictionaries:

  • B8ZS — est l abréviation de bipolar with eight zero substitution. Il s agit d une méthode utilisée dans les systèmes de type T carrier qui autorise des débits de 64 kbit/s par canal. Sur un T1, les uns sur envoyés en appliquant une tension au conducteur …   Wikipédia en Français

  • B8ZS — Das Bipolar With 8 Zeros Substitution Encoding Schema ist ein Format der Leitungscodierung für Rechnernetze und basiert auf Bipolar AMI für die OSI Schicht 1 (Physical Layer). B8ZS verhindert einen Synchronisationsverlust bei einem langen Strom… …   Deutsch Wikipedia

  • B8ZS — Bipolar 8 Zero Substitution (Computing » Telecom) * Binary Eight Zero Substitution (Computing » General) * Bi polar with 8 Zero Substitution (Computing » Networking) …   Abbreviations dictionary

  • B8ZS — Bipolar/Binary with 8 Zero Substitution Kodierungstechnik für T1 Kanäle mit 1.) Option …   Acronyms

  • B8ZS — Bipolar/Binary with 8 Zero Substitution Kodierungstechnik für T1 Kanäle mit 1.) Option …   Acronyms von A bis Z

  • B8ZS —    Bipolar 8 Zero Substitution …   IT glossary of terms, acronyms and abbreviations

  • B8ZS — abbr. Binary 8 Zero Suppression (encoding) (ISDN, T1) acronym Binary 8 Zero Substitution (see also NRZ, NRZI, AMI) …   United dictionary of abbreviations and acronyms

  • Bit Error Rate Test — BERT or Bit Error Rate Test is a testing method for digital communication circuits that uses predetermined stress patterns comprising of a sequence of logical ones and zeros generated by a pseudorandom binary sequence. A BERT Tester typically… …   Wikipedia

  • T-carrier — In telecommunications, T carrier, sometimes abbreviated as T CXR , is the generic designator for any of several digitally multiplexed telecommunications carrier systems originally developed by Bell Labs and used in North America, Japan, and Korea …   Wikipedia

  • Codificación digital — Se entiende por Codificación en el contexto de la Ingeniería al proceso de conversión de un sistema de datos de origen a otro sistema de datos de destino. De ello se desprende como corolario que la información contenida en esos datos resultantes… …   Wikipedia Español

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”