B channel

B channels at the S ₀ interface of the basic connection

A B-channel ( English : bearer channel , "carrier channel") is the channel for the transmission of user data (for example voice) in ISDN . A B-channel is therefore also referred to as a useful channel . A B-channel offers a bit-transparent and synchronous connection to another participant with a data transfer rate of 64 kbit / s ( full duplex ). It is used for direct communication between subscribers and not, like the D channel , for the exchange of signaling information between the terminal and the exchange .

In Europe, an ISDN basic connection has two B channels and an ISDN primary rate connection has at least 16 and a maximum of 30 B channels.

In a GSM network, the traffic channel corresponds to the B channel.

Individual evidence

1. ↑ ITU-T I.412 ISDN User-Network Interfaces - Interface Structures and Access Capabilities
2. ↑ 3GPP TS 45.002: Multiplexing and multiple access on the radio path