What is H channel standards are defined by the International Telecommunication Union (ITU) and are composed of different combinations of Integrated Services Digital Network (ISDN) B channels.
The most common configurations are as follows:
- H0 channel, which consists of six B channels multiplexed to provide a data transmission speed of 384 Kbps. This service is sometimes called switched 384 or ISDN H0.
- H11 channel, which consists of 24 B channels to provide 1536 Kbps of bandwidth. This is sometimes called ISDN H11 or switched 1536.
- H12 channel, which consists of 30 B channels to provide 1920 Kbps of bandwidth. This is sometimes called ISDN H12 or switched 1920.