{"id":2166,"date":"2016-12-01T07:41:53","date_gmt":"2016-12-01T02:11:53","guid":{"rendered":"http:\/\/ipwithease.com\/?p=2166"},"modified":"2025-04-01T22:07:40","modified_gmt":"2025-04-01T16:37:40","slug":"pri-primary-rate-interface","status":"publish","type":"post","link":"https:\/\/ipwithease.com\/pri-primary-rate-interface\/","title":{"rendered":"PRI \u2013 PRIMARY RATE INTERFACE"},"content":{"rendered":"<div id=\"ipwit-3704083774\" class=\"ipwit-before-content ipwit-entity-placement\" style=\"width: 728px;\"><div class=\"ipwit-adlabel\">Google ADs<\/div><div style=\"height: 90px;\"><script async src=\"\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js?client=ca-pub-1375203873676133\" crossorigin=\"anonymous\"><\/script><ins class=\"adsbygoogle\" style=\"display:inline-block;width:728px;height:90px;\" \ndata-ad-client=\"ca-pub-1375203873676133\" \ndata-ad-slot=\"9359532231\"><\/ins> \n<script> \n(adsbygoogle = window.adsbygoogle || []).push({}); \n<\/script>\n<\/div><\/div><p><strong><img decoding=\"async\" class=\"aligncenter wp-image-10080\" src=\"https:\/\/ipwithease.com\/wp-content\/uploads\/2016\/12\/PRI.jpg\" alt=\"\" width=\"700\" height=\"422\" title=\"\" srcset=\"https:\/\/ipwithease.com\/wp-content\/uploads\/2016\/12\/PRI.jpg 800w, https:\/\/ipwithease.com\/wp-content\/uploads\/2016\/12\/PRI-300x181.jpg 300w, https:\/\/ipwithease.com\/wp-content\/uploads\/2016\/12\/PRI-600x362.jpg 600w, https:\/\/ipwithease.com\/wp-content\/uploads\/2016\/12\/PRI-768x463.jpg 768w\" sizes=\"(max-width: 700px) 100vw, 700px\" \/>PRI<\/strong>\u00a0stands for Primary Rate Interface.\u00a0<strong>PRI<\/strong>\u00a0is an industry standard based for transporting multiple voice and data streams between a user and network.\u00a0<strong>PRI<\/strong>\u00a0is part of ISDN technology (Integrated Services Digital Network) and implemented on E1 &amp; T1 lines.\u00a0<strong>PRI<\/strong>\u00a0is the standard for delivering telecom services to business locations.<\/p>\n<p>On E1 lines operating at 2048 Kbps, 30 channels of E1 are used as B-channels (Bearer channels) and 2 channels are used as D-channels (for control and signaling). Hence, the frame structure of an E1\u00a0<strong>PRI<\/strong>\u00a0connection is said to be 30B+2D where the 2 D-channels are on timeslots 0 and 16 and the remaining channels are used as B-channels (B channels may be used for Voice or Data traffic). The timeslot assignment of channels is \u2013<\/p>\n<p>Channel 0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u2013\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 D-channel (Used mainly for clocking and synchronisation)<\/p><div id=\"ipwit-3474583185\" class=\"ipwit-content ipwit-entity-placement\"><div class=\"ipwit-adlabel\">Google ADs<\/div><script async src=\"\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js?client=ca-pub-1375203873676133\" crossorigin=\"anonymous\"><\/script><ins class=\"adsbygoogle\" style=\"display:block;\" data-ad-client=\"ca-pub-1375203873676133\" \ndata-ad-slot=\"2483378328\" \ndata-ad-format=\"auto\"><\/ins>\n<script> \n(adsbygoogle = window.adsbygoogle || []).push({}); \n<\/script>\n<\/div><br style=\"clear: both; display: block; float: none;\"\/>\n<p>Channel 1-15\u00a0\u00a0\u00a0 \u00a0\u2013\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 B-channel (Voice)<\/p>\n<p>Channel 16\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \u2013\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 D-channel (Signalling)<\/p>\n<p>Channel 17-31 \u00a0\u00a0\u2013\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 B-channel (Voice)<\/p>\n<p>&nbsp;<\/p>\n<p>On\u00a0<strong>T1<\/strong>\u00a0lines operating at 1.544 Mbps,\u00a0<strong>PRI<\/strong>\u00a0provides 23 B channels (for user data and voice) and 1 D channel (for control and signalling). Hence, the frame structure of a T1 PRI connection is said to be 23B+D where the D-channels is on timeslot 23 and the remaining channels are used as B-channels (B channels may be used for Voice or Data traffic).<\/p>\n<h2><strong>To summarize :<\/strong><\/h2>\n<ul>\n<li>PRI system is an end-to-end digital circuit which enables the delivery of 30 or 23 calls simultaneously.<\/li>\n<li>There are number of D-channels and B-channels which are responsible for data transfer, video conferencing, voice calling along with other controlling and signaling information.<\/li>\n<li>PRI line consists of 23\/30 B-channels and D-channels over T1\/E1 lines.<\/li>\n<li>T1 PRI standard is popular in America.<\/li>\n<li>E1 PRI standard is popular in India and European countries.<\/li>\n<li>PRI uses Q.931 protocol over D-channel.<\/li>\n<\/ul>\n<h2><strong>Benefits of PRI Line:<\/strong><\/h2>\n<ol>\n<li>No need to have dedicated auto-attendant to address every call. As the service provider of the PRI system provides around nearly 500 numbers for each extension, any outsider can call the extension directly.<\/li>\n<li>Each extension can have own number which helps caller ID is another vital benefit. Every extension has its own number and that is shown while they are calling to.<\/li>\n<li>Call hunting is simpler. This may incur additional cost for that.<\/li>\n<li>Voice and data access is possible with PRI line.<\/li>\n<li>PRI line is always digital as compared to analog lines which is better technology due to high reliability and ease of maintenance.<\/li>\n<li>PRI being a digital line, it\u2019s not possible to tap a digital line which gives it more security.<\/li>\n<li>PRI provides data, fax, video conferencing, etc. facilities which can be simultaneously performed.<\/li>\n<li>CAPEX and Opex for terminating a PRI line is much lower compared to Analog Lines (considering 30\/23 channels of PRI vs 30\/23 analog lines)<\/li>\n<li>PRI management and termination is simpler than analog lines. For eg \u2013 1 slot to terminate PRI line as compared to 30 slots\/ports to terminate analog lines.<\/li>\n<li>PRI lines take lesser time to establish calls then analog trunk lines<\/li>\n<\/ol>\n<h3>ABOUT THE AUTHOR<\/h3><div id=\"ipwit-1845877371\" class=\"ipwit-post-end-ad ipwit-entity-placement\"><script async src=\"\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js?client=ca-pub-1375203873676133\" crossorigin=\"anonymous\"><\/script><ins class=\"adsbygoogle\" style=\"display:block;\" data-ad-client=\"ca-pub-1375203873676133\" \ndata-ad-slot=\"2483378328\" \ndata-ad-format=\"auto\"><\/ins>\n<script> \n(adsbygoogle = window.adsbygoogle || []).push({}); \n<\/script>\n<\/div><br style=\"clear: both; display: block; float: none;\"\/>","protected":false},"excerpt":{"rendered":"<p>PRI\u00a0stands for Primary Rate Interface.\u00a0PRI\u00a0is an industry standard based for transporting multiple voice and data streams between a user and [&hellip;]<\/p>\n","protected":false},"author":782,"featured_media":10080,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center 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