1.1.2. AUX Channel
The DisplayPort AUX channel is a half-duplex, bidirectional channel running at 1 Mbps rate.
Figure 3. AUX Channel Differential PairThe AUX channel is a differential pair doubly-terminated with 50 ohm resistors and AC-coupled at both source and sink devices.
The 100-KΩ and 1-MΩ pull-up and pull-down resistors are placed between the connectors and AC-coupling capacitors. These resistors help detect any DisplayPort upstream devices, including a powered DisplayPort upstream device by a sink device.
|AUX Direct Current (DC) Common Mode Voltage||0.0 V||2.0 V||Common mode voltage is equal to Vbias_TX (or Vbias_RX)|
|AUX Peak-to-Peak Voltage||0.29 V||1.38 V||Differential peak-to-peak voltage swing|
|AUX AC-Coupling Capacitor||75 nF||200 nF||The AUX channel AC-coupling capacitors are placed on both the DisplayPort upstream and downstream devices.|
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