return channel
low-speed, or less-than-optimal, telecommunications transmission channel in the opposite direction to the main channel
en-US/ɹɪˈtɝn ˈt͡ʃænəl/
en-GB/ɹɪˈtɜːn ˈt͡ʃænl/
low-speed, or less-than-optimal, telecommunications transmission channel in the opposite direction to the main channel