| Definition: | a designated part of the information transfer capability, having specified characteristics, provided at the user-network interface
NOTE 1 – In English, the term "transmission channel" is well understood to imply unidirectional working only, and then is commonly abbreviated to "channel". To avoid confusion with this usage, the term "access channel", which encompasses bidirectional working through the user-network interface must not be abbreviated to "channel".
NOTE 2 – An "access channel" may be qualified, for example, by H, B or D, in which case it is appropriate to call it an H-channel, a B-channel or a D-channel.
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