High Quality Content by WIKIPEDIA articles! 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 International Telecommunication Union (ITU). It is one of two configurations for use in the access network, the other being Primary Rate Interface (PRI). The BRI configuration provides two 64 kbit/s bearer channels (B channels) and one 16 kbit/s Delta 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 aggregated by channel bonding providing a total data rate of 128 kbit/s. The BRI ISDN service is commonly installed for residential or small business service in many countries. 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.

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