Basic Rate ISDN 

n 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 Kbps B-channels and one 16 Kbps D-channel. Thus, a Basic Rate Interface user can have up to 128 Kbps service. The Primary Rate Interface consists of 23 B-channels and one 64 Kpbs D-channel in the United States or 30 B-channels and 1 D-channel in Europe.

Answered by Nagendra at 8:14 AM on May 09, 2008

Well,

Basic Rate ISDN (BRI)


Basic Rate ISDN (BRI) service allows a single telephone line to carry voice, video, and data simultaneously to give you more efficient and affordable service.

BRI has:

* Two B channels to carry voice, video, or data
o Each B channel contains speeds as high as 64 Kbps
o B channels can be combined to offer up to 128 Kbps for applications that require more bandwidth

* A third channel (the D channel) to carry the call set-up information and low-speed packet data


Sample Applications:

* One line with multiple directory numbers

* Extended networks with high speed connections and large bandwidth for remote locations

* Connect across a campus or across the country


Features:

* All-digital service
* Speeds up to 128 Kbps
* Integrated voice, video and data
* Flexible capacity on demand
* Uses existing wiring


Benefits:

* Enables efficiency. Voice, video, and data are transmitted simultaneously
* Improves customer service. Multiple calls can be received over one line
* Increases transmission accuracy and speed. Since BRI service operates over a digital network, errors in data transmission are reduced. Data is sent at higher speeds than with analog modems
* Improves network connectivity. Multiple locations can share information without the need for a dedicated line
* Increases the speed and flexibility of communications from remote or home office locations.
* Saves money. No specialized cabling is required. BRI operates over the twisted-pair wiring used for telephone service.

Answered by ajay kumar at 7:44 AM on April 20, 2008

* Basic Rate ISDN is ideal for small sites that require high speed data transmission and want to integrate their voice, fax and data traffic over one access line.
* Telecom Basic Rate ISDN is particularly suited to regional offices, small businesses and individual users within corporations.
* It provides two 64 kbit/s channels into your premises over your existing telephone line.
* These are channels that are used to transmit your voice, image, video or data calls.

Answered by Bishan Preet at 1:32 AM on April 15, 2008

kash it is The basic rate ISDN interface provides two 64 Kb/s chan-nels (called B channels) to carry voice or data and one 16 Kb/s signaling channel .

Answered by raj u at 7:08 PM on April 14, 2008

ISDN, which stands for Integrated Services Digital Network, is a system of digital phone connections which has been available for over a decade. This system allows voice and data to be transmitted simultaneously across the world using end-to-end digital connectivity.

ISDN is accessed through one of two services:
1) Basic Rate Access (BRA)
2) Primary Rate Access (PRA).

Basic Rate Access (BRA) provides an ISDN user with simultaneous access to two 64 kbps data channels using the existing twisted pair copper telephone cable. Each data channel is referred to as a B-channel and can carry voice or data. Another channel, the D-channel, operates at 16 kbps and is used for signalling to the ISDN. The total data rate of BRA is therefore 144 kbps. The two B-channels and the single signalling channel give rise to the term '2B+D'. Basic rate ISDN is intended for low capacity usage, such as that required for small businesses.

Answered by Ashish Yadav at 4:55 PM on April 14, 2008

Basic Rate ISDN (BRI) service allows a single telephone line to carry voice, video, and data simultaneously to give you more efficient and affordable service.
Basic rate ISDN carries two full-duplex 64 Kilobit per second channels for user data called B-channels and one full-duplex 16 Kilobit per second channel used for signaling called the D-channel.

Answered by Kajal at 4:45 PM on April 14, 2008

Basic Rate ISDN (BRI) service allows a single telephone line to carry voice, video, and data simultaneously to give you more efficient and affordable service.
BRI has:
Two B channels to carry voice, video, or data
Each B channel contains speeds as high as 64 Kbps
B channels can be combined to offer up to 128 Kbps for applications that require more bandwidth. A third channel (the D channel) to carry the call set-up information and low-speed packet data

Answered by poonam at 4:42 PM on April 14, 2008

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" channel (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.

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.

Two modulation methods are used to deliver U-Interface signals over an ordinary copper pair: 2B1Q in North America, and 4B3T elsewhere.

Answered by Kaushal at 3:05 PM on April 14, 2008

well kash, The basic rate ISDN interface provides two 64 Kb/s chan-nels (called B channels) to carry voice or data and one 16 Kb/s signaling channel (the D channel) for call information.A 2-wire line-side local switching system port that uses the 2B1Q line code at a 160 kilobit per second rate to transport overhead and up to two B channels and one D channel.

Answered by Saurabh at 1:21 PM on April 14, 2008

Basic Rate ISDN (BRI) service allows a single telephone line to carry voice, video, and data simultaneously to give you more efficient and affordable service.

BRI has:

* Two B channels to carry voice, video, or data
o Each B channel contains speeds as high as 64 Kbps
o B channels can be combined to offer up to 128 Kbps for applications that require more bandwidth
* A third channel (the D channel) to carry the call set-up information and low-speed packet data

Answered by pooja at 11:31 AM on April 14, 2008