Wake-up, function - GF82.00-P-2001AB

MODELS 215, 220 as of 1.9.03 

Normal wake-up (all) 

As the transmission and receiver diodes are automatically switched off when not required (sleep mode) at the start of new data transfer a command is required by the COMAND operating, display and control unit (A40/3) and/or a wake-up pulse which activates the system. This happens over a separate wake-up line.

For this purpose the audio gateway control unit (N93/1) triggers a wake-up signal (electrical signal), which lowers the voltage in the wake-up line to a defined value. A chip in the components recognizes on account of the signal's duration that the signal in question is a wake-up signal, and the MOST ring is then activated. A wake-up can also be triggered by an incoming telephone call through the corresponding component during the run-out phase.

Diagnosis wake-up 

For diagnosis of the wake-up circuit in the components, the audio gateway control unit (N93/1) can be instructed by STAR DIAGNOSIS to trigger a wake-up diagnosis signal.

This signal differentiates itself from the wake-up signal through its distinctly longer duration. The components for their part react with a signal to the wake-up line (message to the audio gateway control unit (N93/1)).

With this the audio gateway control unit (N93/1) can then detect, which components have received the long wake-up pulse. The diagnosis wake-up signal can only be triggered if the optical ring cannot be activated due to a fault. If all components answer the audio gateway control unit (N93/1), the voltage supply is correct.