> For the complete documentation index, see [llms.txt](https://isdn.learn-telecom.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://isdn.learn-telecom.com/channels/isdn-b-channel.md).

# ISDN B-Channel

The ISDN B-Channel, or Bearer Channel, is primarily used for voice and data transmission in Integrated Services Digital Network (ISDN) services. 

It offers a bandwidth of 64 Kbps and is responsible for carrying user data. 

Each ISDN connection typically provides multiple B-Channels, allowing for simultaneous data and voice communications.