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Primary and Rate
DPNSS was developed in the early 1980s by BT, or its forerunner, Post Office Telecommunications in recognition that the emerging Digital Private Circuit Primary Rate product ' Megastream ' had to address the market for both data and voice, the latter being significantly greater because of the market for PBXs.
There are several kinds of access interfaces to ISDN defined as Basic Rate Interface ( BRI ), Primary Rate Interface ( PRI ) and Broadband ISDN ( B-ISDN ).
The other ISDN access available is the Primary Rate Interface ( PRI ), which is carried over an E1 ( 2048 kbit / s ) in most parts of the world.
Primary Rate Interface ( PRI ), also called primary rate access ( PRA ) in Europe — contains a greater number of B channels and a D channel with a bandwidth of 64 kbit / s.
The following is an example of a Primary Rate ( PRI ) ISDN call showing the Q. 921 / LAPD and the Q. 931 / Network message intermixed ( i. e. exactly what was exchanged on the D-channel ).
The Integrated Services Digital Network ( ISDN ) prescribes two levels of service, the Basic Rate Interface ( BRI ), intended for the homes and small enterprises, and the Primary Rate Interface ( PRI ), for larger applications.
The Primary Rate Interface ( PRI ) consists of 23 64-kbit / s B-channels and one 64-kbit / s D-channel using a T1 line, often referred to as " 23B + D ", ( North American and Japanese standard ) or 30 B-channels and one D-channel using an E1 line ( Europe / rest of world ).
A T1 Primary Rate Interface user would have access to a 1. 472-Mbit / s data service.
An E1 Primary Rate Interface user would have access to a 1. 920 Mbit / s data service
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 ).
The Primary Rate user is hooked up directly to the telephone company central office.
fr: Primary Rate Interface
it: Primary Rate Interface
pl: Primary Rate Interface
In contrast to the BRI, the Primary Rate Interface ( PRI ) configuration provides more B channels and operates at a higher bit rate.
In the typical telephony environment, a PBX connects to the local service provider through Primary Rate Interface ( PRI ) trunks.
* Primary Rate Interface, telecommunication standard
Additionally, for voice T1s there are two main types: so-called " plain " or Inband T1s and PRI ( Primary Rate Interface ).
Non-Facility Associated Signalling or NFAS is a Primary Rate Interface configuration whereby multiple T1 carriers share a signalling channel ( or D channel ).
When a T1 circuit is used to carry Primary Rate ISDN one of the timeslots is used to carry the D channel.
A single Primary Rate ISDN circuit is thus sometimes described as 23B + D. There are 23 bearer channels carrying voice or data, and one D channel carrying the Common Channel Signaling.
Customers ordering a Primary Rate ISDN service will be charged for each signalling channel.

Primary and Interface
* Non-Facility Associated Signalling, a Primary Rate Interface configuration whereby multiple T1 carriers share a signaling channel ( or D channel ).
Primary research articles are published in the sister journals Proceedings of the Royal Society, Biology Letters, Journal of the Royal Society Interface, and Interface Focus.

Primary and PRI
E & M is considered an obsolete technology for new installations, which generally use Basic Rate ( BRI ) or Primary Rate ( PRI ) digital interfaces.

Primary and is
The ACT public education system schooling is normally split up into Pre-School, Primary School ( K-6 ), High School ( 7 – 10 ) and College ( 11 – 12 ) followed by studies at university or TAFE.
: This innate coordination that emerges is also described more specifically as " Primary Control ".
Primary progressive aphasia ( PPA ) is associated with progressive illnesses or dementia, such as
Victoria Primary School is also in this area on a large grounds.
Primary memory stored on secondary memory is called " virtual memory ".
Dartmouth Community College and Dartmouth Primary School are part of the Dartmouth Learning Campus ; as from September 2007, Dartmouth Community College is part of a federation with Dartmouth Primary School and Nursery, meaning that the two schools share one governing body for pupils aged 1 to 19.
* Primary structure, such as the sequence of amino acids held together by covalent peptide bonds, is not disrupted by denaturation.
Universal Primary Education is one of the eight Millennium Development Goals and great improvements have been achieved in the past decade, yet a great deal remains to be done.
Primary production is the production of organic matter from inorganic carbon sources.
Primary among these is Title 40 of the Code of Federal Regulations, containing the regulations of the Environmental Protection Agency.
Primary among these is the end-user, the individual who uses the system for its problem solving assistance.
* Primary reading epilepsy is a reflex epilepsy classified as an idiopathic localization-related epilepsy.
Primary production is 2. 9 percent.
There is even a competition series in Scotland – the Plastic-and-Foam Fencing FunLeague – specifically for Primary and early-Secondary school-age children using this equipment.
He attended Kings Road Primary School, where a house is now named after him.
Also named after him and his son is George Stephenson High School in Killingworth, Stephenson Memorial Primary School in Howdon, the Stephenson Railway Museum in North Shields and the Stephenson Locomotive Society.
Primary issues concerning the existence and cause of climate change include the reasons for the increase in global average air temperature, whether the warming trend is unprecedented or within normal climatic variations, whether humankind has contributed significantly to it, and whether the increase is wholly or partially an artifact of poor measurements.
Primary industry is a larger sector in developing countries ; for instance, animal husbandry is more common in Africa than in Japan.
* Primary pathogens cause disease as a result of their presence or activity within the normal, healthy host, and their intrinsic virulence ( the severity of the disease they cause ) is, in part, a necessary consequence of their need to reproduce and spread.
* Number 1: shall mean that the Volume Descriptor is a Primary Volume Descriptor

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