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<title>Basic Rate Interface</title>

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<span id="openzim-page-title" class="mw-page-title-main"><span class="mw-page-title-main">Basic Rate Interface</span></span>

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<p><b>Basic Rate Interface</b> (<b>BRI</b>, <b>2B+D</b>, <b>2B1D</b>) or <b>Basic Rate Access</b> is an <a href="Integrated_Services_Digital_Network" class="mw-redirect" title="Integrated Services Digital Network">Integrated Services Digital Network</a> (ISDN) configuration intended primarily for use in <a href="Subscriber_line" class="mw-redirect" title="Subscriber line">subscriber lines</a> similar to those that have long been used for <a href="Plain_old_telephone_service" title="Plain old telephone service">voice-grade telephone service</a>.

As such, an ISDN BRI connection can use the <a href="Plain_old_telephone_service" title="Plain old telephone service">existing telephone infrastructure</a> at a business.

</p><p>The BRI configuration provides 2 data (bearer) channels (<a href="B_channel" title="B channel">B channels</a>) at 64 kbit/s each and 1 control (delta) channel (<a href="D_channel" title="D channel">D channel</a>) at 16 kbit/s. The B channels are used for <a href="Human_voice" title="Human voice">voice</a> or user <a href="Data" title="Data">data</a>, and the D channel is used for any combination of data, <a href="Signaling_(telecommunications)" title="Signaling (telecommunications)">control signaling</a>, and <a href="X.25" title="X.25">X.25</a> packet networking.<sup id="cite_ref-1" class="reference"><a href="#cite_note-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> The 2 <a href="B_channel" title="B channel">B channels</a> can be aggregated by <a href="Channel_bonding" class="mw-redirect" title="Channel bonding">channel bonding</a> providing a total data rate of 128 kbit/s. The BRI ISDN service is commonly installed for <a href="Residential" class="mw-redirect" title="Residential">residential</a> or small business service (ISDN <a href="PABX" class="mw-redirect" title="PABX">PABX</a>) in many countries.

</p><p>In contrast to the BRI, the <a href="Primary_Rate_Interface" title="Primary Rate Interface">Primary Rate Interface</a> (PRI) configuration provides more <a href="B_channel" title="B channel">B channels</a> and operates at a higher <a href="Bit_rate" title="Bit rate">bit rate</a>.

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<div class="mw-heading mw-heading2"><h2 id="Physical_interfaces">Physical interfaces</h2></div>

<p>The BRI is split in two sections:

a) in-house cabling (S/T reference point or S-bus) from the ISDN terminal up to the <a href="Network_termination_1" title="Network termination 1">network termination 1</a> (NT1) and

b) transmission from the NT1 to the central office (U reference point).

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<ul><li>The in-house part is defined in <a href="I.430" title="I.430">I.430</a> produced by the <a href="International_Telecommunication_Union" title="International Telecommunication Union">International Telecommunication Union</a> (ITU). The S/T-interface (<a href="S_interface" title="S interface">S<sub>0</sub></a>) uses four wires; one pair for the <a href="Uplink" class="mw-redirect" title="Uplink">uplink</a> and another pair for the <a href="Downlink" class="mw-redirect" title="Downlink">downlink</a>. It offers a full-duplex mode of operation. The I.430 protocol defines 48-bit <a href="Data_packet" class="mw-redirect" title="Data packet">packets</a> comprising 16 <a href="Bit" title="Bit">bits</a> from the B1 channel, 16 bits from B2 channel, 4 bits from the D channel, and 12 bits used for <a href="Synchronization" title="Synchronization">synchronization</a> purposes. These packets are sent at a rate of <span class="nowrap">4 <a href="Kilohertz" class="mw-redirect" title="Kilohertz">kHz</a></span>, resulting in a gross <a href="Bit_rate" title="Bit rate">bit rate</a> of 192 kbit/s and – giving the data rates listed above – a maximum possible throughput of <span style="white-space:nowrap">144<span style="margin-left:0.25em">kbit/s</span></span>. The S<sub>0</sub> offers point-to-point or point-to-multipoint operation; Max length: 900 metres (3,000 ft) (point-to-point), 300 metres (980 ft) (point-to-multipoint).</li>

<li>The <a href="U_interface" title="U interface">U<sub>p</sub> Interface</a> uses two wires. The gross bit rate is 160 kbit/s; 144 kbit/s throughput, 12 kbit/s sync and 4 kbit/s maintenance. The signals on the U reference point are encoded by two modulation techniques: 2B1Q in North America, Italy and Switzerland, and 4B3T elsewhere. Depending on the applicable cable length, two varieties are implemented, U<sub>pN</sub> and <a href="Up0-interface" title="Up0-interface">U<sub>p0</sub></a>. The <a href="UK0-Interface" class="mw-redirect" title="UK0-Interface">U<sub>k0</sub></a> interface uses one wire pair with <a href="Echo_cancellation" class="mw-redirect" title="Echo cancellation">echo cancellation</a> for the long <a href="Last_mile_(telecommunications)" title="Last mile (telecommunications)">last mile</a> cable between the <a href="Telephone_exchange" title="Telephone exchange">telephone exchange</a> and the <a href="Network_termination_1" title="Network termination 1">network terminator</a>. The maximum length of this BRI section is between 4 and 8 kilometres (2.5 and 5.0 mi).</li></ul>

<div class="mw-heading mw-heading2"><h2 id="References">References</h2></div>

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</style><span class="citation foldoc">This article is based on material taken from <a rel="nofollow" class="external text" href="https://foldoc.org/Basic+Rate+Interface">Basic+Rate+Interface</a> at the <i><a href="Free_On-line_Dictionary_of_Computing" title="Free On-line Dictionary of Computing">Free On-line Dictionary of Computing</a></i> prior to 1 November 2008 and incorporated under the "relicensing" terms of the <a href="GNU_Free_Documentation_License" title="GNU Free Documentation License">GFDL</a>, version 1.3 or later.</span></span>

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<div class="mw-heading mw-heading2"><h2 id="External_links">External links</h2></div>

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</style><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://web.archive.org/web/20120825163144/http://www.birds-eye.net/definition/b/bri-basic_rate_interface.shtml">"BRI defined on birds-eye.net"</a>. Archived from <a rel="nofollow" class="external text" href="http://www.birds-eye.net/definition/b/bri-basic_rate_interface.shtml">the original</a> on 2012-08-25<span class="reference-accessdate">. Retrieved <span class="nowrap">2012-08-25</span></span>.</cite></li></ul></div><div><div class="zim-footer">

This article is issued from <a class="external text" title="Last edited on 2024-11-19" href="https://en.wikipedia.org/wiki/?title=Basic_Rate_Interface&oldid=1258435812">Wikipedia</a>. The text is available under <a class="external text" href="https://creativecommons.org/licenses/by-sa/4.0/deed.en">Creative Commons Attribution-Share Alike 4.0</a> unless otherwise noted. Additional terms may apply for the media files.

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