Primary rate interface

Primary rate interface

The primary rate interface (PRI) is a telecommunications standard for carrying multiple DS0 voice and data transmissions between two physical locations.

All data and voice channels are ISDN and operate at 64 kbit/s.

T1 vs. E1 Systems

North America and Japan use a T1 system of 23 B channels and one D channel which corresponds to a T1 line. Europe, Australia and most of the rest of the world use the slightly higher capacity E1 system, which is composed of 30 B channels and one D channel.

See T-carrier for DS0, T1, E1, T3, E3 and other carrier communications terms.

PRI vs. BRI

In the Integrated Services Digital Network (ISDN), there are two levels of service: the Basic Rate Interface (BRI), intended for the home and small enterprise, and the Primary Rate Interface (PRI), for larger users. Both rates include a number of B-channels and a D-channel. Each B-channel carries data, voice, and other services. The D-channel carries control and signaling information. The Basic Rate Interface consists of two 64 kbit/s B-channels and one 16 kbit/s D-channel. Thus, a Basic Rate Interface user can have up to 128 kbit/s service. The Primary Rate Interface consists of 23 B-channels and one 64 kbit/s D-channel using a T1 line (North American standard) or 30 B-channels and one D-channel using an E1 line (Europe/Rest of World). Thus, a Primary Rate Interface user on a T1 line can have up to 1.544 Mbit/s service or up to 2.048 Mbit/s service on an E1 line. PRI uses the Q.931 protocol over the D-channel.

Fractional T1

Fewer active B channels (also called user channels) can be used for a fractional T1. More channels can be used with more T1s, within certain design limits.

Application

The Primary Rate Interface channels are typically used by medium to large enterprises with digital PBXs to provide them digital access to the Public Switched Telephone Network (PSTN) and to the Digital Switched Network. The 23 (or 30) B-channels can be used flexibly and reassigned when necessary to meet special needs such as videoconferences. The Primary Rate user is hooked up directly to the telephone company central office.

ee also

*Basic Rate Interface
*Non-Facility Associated Signalling

Sources: From Federal Standard 1037C


Wikimedia Foundation. 2010.

Игры ⚽ Поможем решить контрольную работу

Look at other dictionaries:

  • Primary Rate Interface — Suite de protocoles RNIS Couche Protocoles Canal D Protocoles Canal B Signali sation Paquet Télémétrie Commut. Circuit Semi Permanent Commut. paquet Application …   Wikipédia en Français

  • Primary Rate Interface — Der Primärmultiplexanschluss (PMxAs), englisch Primary Rate Interface (PRI), ist eine Schnittstellendefinition im ISDN, die im Wesentlichen von Unternehmen zum Anschluss von Telefonanlagen an das ISDN verwendet wird. Eine andere Anschlussart im… …   Deutsch Wikipedia

  • primary rate interface — noun an ISDN service delivered over T1 , E1 or J1 datalines, with delivery of connections between 1472 kilobits per second and 1984 kilobits per second (kibibits) Syn: PRI …   Wiktionary

  • primary rate interface —    (PRI)    An ISDN term that refers to 23B + 1D channels, operating at 1.544M bps in the U.S. or 30B + 1D channels operating at 2.048M bps in Europe …   IT glossary of terms, acronyms and abbreviations

  • Basic rate interface — (BRI, 2B+D, 2B1D) is an Integrated Services Digital Network (ISDN) configuration defined in the physical layer standard I.430 produced by the ITU. This configuration consists of two 64 kbit/s bearer channels (B channels) and one 16 kbit/s data… …   Wikipedia

  • Basic Rate Interface — Pour les articles homonymes, voir BRI. Suite de protocoles RNIS Couche Protocoles Canal D Protocoles Canal B Signali sation Paquet Télémétrie …   Wikipédia en Français

  • Serial digital interface — (SDI) refers to a family of video interfaces standardized by SMPTE. [cite book | title = Digital Video and HDTV | author = Charles A. Poynton | publisher = Morgan Kaufmann | year = 2003 | isbn = 1558607927 | url = http://books.google.com/books?id …   Wikipedia

  • Brain–computer interface — Neuropsychology Topics Brain computer interface …   Wikipedia

  • Brain-computer interface — A brain computer interface (BCI), sometimes called a direct neural interface or a brain machine interface, is a direct communication pathway between a human or animal brain (or brain cell culture) and an external device. In one way BCIs,… …   Wikipedia

  • Scalable Link Interface — For other uses, see SLI (disambiguation). Scalable Link Interface Manufacturer NVIDIA Predecessor Scan Line Interleave …   Wikipedia

Share the article and excerpts

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