| Definition: | an access channel intended to carry user information in standardized digital signals at a specified digit rate higher than 64 kbit/s
NOTE 1 – An H-channel is usually characterized by one or two indices:
- the first one refers to the channel digit rate; for example, an H0-channel has a digit rate of 384 kbit/s;
- the second, if any, refers to the digital hierarchy; for example, an H11-channel has a digit rate of 1536 kbit/s, and an H12-channel has a digit rate of 1920 kbit/s.
NOTE 2 – A given H-channel may be subdivided into H-channels of lower digit rates, B channels and/or D-channels.
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