Dahua Technology LE-L - Manual (Page 30)

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4 HDD Series
2 HDD Series
Figure 3-2
3.7 Connecting Audio Input & Output, Bidirectional Audio
3.7.1 Audio Input
These series products audio input port adopt BNC port, matrix and loop use BNC port. Device
supports bidirectional talk via BNC.
Due to high impedance of audio input, please use active sound pick-up. See
X285H285H285H
Figure 3-3.
Audio transmission is similar to video transmission. Try to avoid interference, dry joint, loose
contact and it shall be away from high tension current.