Note 1 to entry: Several transmission channels can share a common path: for example, where each transmission channel is allocated a particular frequency band or a particular time-slot.

Note 2 to entry: The adjective "transmission" can be replaced by an adjective indicating the nature of the transmitted signals, or the frequency bandwidth, or the digit rate; for example, telephone channel, telegraph channel, data channel, 10 MHz channel, 34 Mbit/s channel.