Basic Rate Interface ISDN (BRI-ISDN)

BRI-ISDN is a standard form of communication on ISDN communication systems.

What is BRI-ISDN (Basic Rate Interface ISDN)?

BRI-ISDN stands for Basic Rate Interface ISDN, is a standard form of communication on Integrated Services Digital Network (ISDN) communication systems. Basic Rate Interface ISDN (BRI-ISDN) connections consist of two B channels and one D channel. The B channels carry the voice or data between the customer premises and the telco’s central office (CO), while the D channel is used for establishing connections and signaling. BRI-ISDN is often referred to as 2B+D because of the channels that it uses.


The bandwidth of each B channel is 64 Kbps, so the total bandwidth of BRI-ISDN is twice that, 128 Kbps. This bandwidth can be used as two separate communication links of 64 Kbps each, or it can be combined using bonding into a single 128-Kbps communication link. The bandwidth of the D channel is 16 Kbps.

BRI-ISDN connections at customer premises can be connected directly to a switch at the telco’s central office, an ISDN call controller that is linked to the CO, an ISDN Private Branch Exchange (PBX), or some other signaling and communication equipment.


Articles posted after being checked by editors.

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