Wake-Up, Function

Wake-Up, Function

Normal wake-up (all)
Since the transmission and receiving diodes and D2B chip are switched off automatically when not required (sleep mode), a wake-up pulse is required at the beginning of new data transmission to activate the system.

This is accomplished via the separate wake-up line. For this purpose, the master unit outputs a wake-up signal (electrical signal), which allows the voltage in the wake-up line to decrease to a defined value. The D2B chip in the component recognizes from the duration of the signal that it is a wake-up signal and the D2B ring "starts up". The D2B ring is then in the switched-on state.

A wake-up signal can be accomplished in the sleep mode without a wake-up pulse from the master unit, for example, by the telephone adapter for the telephone system when a telephone call is received.

Wake-up diagnosis
The master unit can actuate a wake-up diagnosis signal via Star Diagnosis for diagnosis of the wake-up circuit in the components. This signal differs from the wake-up signal due to the fact that it is significantly longer. The components themselves react to this long wake-up signal with a signal on the wake-up line (message to master unit).

It allows the master unit to recognize which components have received the long wake-up pulse. Wake-up diagnosis can only be started when the optical ring cannot be "started up"due to a malfunction.

If all components return a signal to the master unit, their power supply is ok.