In the Integrated Services Digital Network (ISDN), a high-speed channel comprising multiple aggregated low-speed channels to accommodate bandwidth-intensive applications such as file transfer, videoconferencing, and high-quality audio. An H channel is formed of multiple bearer B channels bonded together in a primary rate access (PRA) or primary rate interface (PRI) frame in support of applications with bandwidth requirements that exceed the B channel rate of 64 kbit/s. The channels, once bonded, remain so end-to-end, from transmitter to receiver, through the ISDN network. The feature is known variously as multirate ISDN, Nx64, channel aggregation, and bonding. H channels are implemented as:
- H0 = 384 kbit/s(6 B channels)
- H10 = 1427 kbit/s(23 B channels)
- H11 = 1536 kbit/s(24 B channels)
- H12 = 1920 kbit/s(30 B channels) – International (E-carrier) only.
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—Henry David Thoreau (1817–1862)