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Encyclopedia > Basic rate access
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For the French police unit, see Brigade de recherche et d'intervention The Brigade de recherche et dintervention (BRI Research and Intervention Brigade), often called Anti-Gang Brigade, is an elite police special unit of the French Ministère de lIntérieur (Home Ministry). ...


Basic rate interface (BRI, 2B+D, 2B1D) is an Integrated Services Digital Network configuration defined in the physical layer standard I.430 produced by the ITU. This configuration consists of two 64 kbit/s "bearer" (B) channels and one 16 kbit/s "delta" (D) channel. The B channels are used for voice or user data, and the D channel is used for any combination of: data, control/signalling and X.25 packet networking. The two B channels can be bonded together giving a total data rate of 128 kbit/s. BRI is the kind of ISDN interface most likely to be found in residential service. Jump to: navigation, search An ISDN Telephone Integrated Services Digital Network (ISDN) is a type of circuit switched telephone network system, designed to allow digital (as opposed to analog) transmission of voice and data over ordinary telephone copper wires, resulting in better quality and higher speeds, than available with analog... The International Telecommunication Union (ITU) is an international organization established to standardize and regulate international radio and telecommunications. ... B channel (bearer) is a telecommunications term which refers to the ISDN channel in which the primary data or voice communication is carried. ... D channel (delta) is a telecommunications term which refers to the ISDN channel in which the control and signalling information is carried. ... Jump to: navigation, search The word voice can be used to refer to: Sound: The human voice. ... Jump to: navigation, search DATA (Debt, AIDS, Trade, Africa) was established in 2002 by Bono (Paul Hewson) of the Rock band U2, and Bobby Shriver, along with activists from the Jubilee 2000 Drop the Debt Campaign, as an organisaton focused on Justice, not charity. ... X.25 is an ITU-T standard protocol suite for WAN networks using the phone or ISDN system as the networking hardware. ... B channel (bearer) is a telecommunications term which refers to the ISDN channel in which the primary data or voice communication is carried. ... Jump to: navigation, search An ISDN Telephone Integrated Services Digital Network (ISDN) is a type of circuit switched telephone network system, designed to allow digital (as opposed to analog) transmission of voice and data over ordinary telephone copper wires, resulting in better quality and higher speeds, than available with analog... A residential area is a type of land use where the predominant use is residential. ...


The I.430 protocol defines 48-bit packets comprising 16 bits from the B1 channel, 16 bits from B2 channel, 4 bits from the D channel, and 12 bits used for synchronization purposes. These packets are sent at a rate of 4 kHz, giving the data rates listed above for a maximum possible throughput of 144 kbit/s. Jump to: navigation, search This article is about the unit of information. ... Synchronization is coordination with respect to time. ... A kilohertz (kHz) is a unit of frequency equal to 1,000 hertz (1,000 cycles per second). ...


References

This article was originally based on material from the Free On-line Dictionary of Computing, which is licensed under the GFDL.

  Results from FactBites:
 
Adaptor between ISDN basic rate access and switched-56 accesses - Patent 5479405 (3519 words)
The unrestricted data rate at which digital data may be transmitted over twisted pairs of wires in accordance with the ISDN recommendation for Basic Rate Access is 144 kbps, i.e.
Depending upon precise details of the electronic circuits included in the Switched-56 Access interface circuit 40a or 40b and in the ISDN Basic Rate Access interface circuit 12, the clock recovery circuit 52 may be a separate circuit as depicted in FIG.
Depending upon the particular type of ISDN telephone device connected to the ISDN Basic Rate Access connector 14, it may or may not be necessary for the ISDN S/T interface to supply an electrical current to the ISDN telephone device in addition to the digital data signals.
Integrated Services Digital Network - Wikipedia, the free encyclopedia (1782 words)
Basic rate interface (BRI) — also Basic rate access (BRA) — consists of two B channels, each with bandwidth of 64 kbit/s, and one D channel with a bandwidth of 16 kbit/s.
The number of B channels for PRI varies according to the nation: in North America and Japan it is 23B+1D, with an aggregate bit rate of 1.544 Mbit/s (T1); in Europe and Australia it is 30B+1D, with an aggregate bit rate of 2.048 Mbit/s (E1).
Another alternative ISDN configuration can be used in which the B channels of an ISDN basic rate interface are bonded to provide a total duplex bandwidth of 128 kbit/s.
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