Power conservation for POTS and modulated data transmission

摘要

A method for conserving power in a terminal unit having a transmitter and a receiver for modulated data communication over a communications loop shared with (voiceband) telephone equipment, characterized by monitoring the loop to detect an out-of-band signal; initiating low power mode of the terminal unit upon detection of a out of band-signal; monitoring the loop to detect a resume signal; and returning to full power mode when the resume signal is detected.