What is the different between BRI & PRI?

Question

In ISDN configuration what is the part of BRI & PRI and What is the different between BRI & PRI

I need brief explanation

Answer 1

one starts with a p and the other starts with a b

Answer 2

one starts with a b and the other starts with a p :]

problem solved.

Answer 3

"Basic Rate Interface

The entry level interface to ISDN is the Basic Rate Interface (BRI), a 144 kbit/s service delivered over a pair of standard telephone copper wires. The 144 kbit/s rate is broken down into two 64 kbit/s bearer channels ('B' channels) and one 16 kbit/s signalling channel ('D' channel).

BRI is sometimes referred to as 2B+D

The Interface specifies three different network interfaces:

    * The U interface is a two-wire interface between the exchange and the Network Terminating Unit which is usually the demarcation point in non-North American networks.

    * The T interface is a serial interface between a computing device and a Terminal Adapter, which is the digital equivalent of a modem.

    * The S interface is a four-wire bus that ISDN consumer devices plug into; the S & T reference points are commonly implemented as a single interface labeled 'S/T' on an NT1

    * The R interface defines the point between a non-ISDN device and a terminal adapter (TA) which provides translation to and from such a device.

BRI-ISDN is very popular in Europe but is much less common in North America.

[edit] Primary Rate Interface

The other ISDN service available is the Primary Rate Interface (PRI) which is carried over an E1 (2048 kbit/s) in most parts of the world. An E1 is 30 'B' channels of 64 kbit/s, one 'D' channel of 64 kbit/s and a timing and alarm channel of 64 kbit/s. In North America PRI service is delivered on one or more T1s (sometimes referred to as 23B+D) of 1544 kbit/s (24 channels). A T1 has 23 'B' channels and 1 'D' channel for signalling (Japan uses a circuit called a J1, which is similar to a T1).

In North America, NFAS allows two or more PRIs to be controlled by a single D channel, and is sometimes called '23B+D + n*24B'. D-channel backup allows you to have a second D channel in case the primary fails. One popular use of NFAS is on a T3.

PRI-ISDN is popular throughout the world, especially for connection of PSTN circuits to PBXs."

Even though many network professionals use the term 'ISDN' to refer to the lower-bandwidth BRI circuit, in North America by far the majority of ISDN services are in fact PRI circuits serving PBXs."

Answer 4

Both BRI (Basic Rate Interface) and PRI (Primary Rate Interface) provide multiple digital bearer channels over which temporary connections can be made and data can be sent.

Features:

ISDN BRI services 2 B channels (64 kbps) and one D channel (16 kbps). The total bandwidth is 144 kbps.

In North America ISDN PRI service is PRI T1 total bandwidth 1.544 Mbps ( 23 B channel with 64 kbps + 1 D channel with 64 Kbps)

In Europe  ISDN PRI service is PRI E1 total bandwidth 2.048 Mbps (30 B channel with 64 kbps + 1 D channel with 64 Kbps)

BRI ( Basic Rate Interface) – 2B+1D i.e 2 bearer channels of 64 kbit/s and 1 data channel of 16 kbits/s . 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.PRI (Primary Rate Interface) – This type of interface carries multiple number of voice and data transmission (T1 – 23B +1D) & (E1 - 30B+1D). These are geographically divided as in T! is used in North America and Japan wheares Europe, Australia andrest of the world uses E1. More higher capacities are available in the form of T3 & E3.So the basic difference between BRI & TRI in simpler terms is for usage as in residential connections use BRI’s and medium to large scale enterprises use PRI.