Aposonic A-H2A8D2 - Manual (Page 17)

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3.2 Optional Connections
Audio inputs
Connect the Audio In/Out Connector to an Audio In/Out Cable, and then
connect the audio input connectors of the cable to the audio line-outs from system
cameras or other audio sources. Please make sure to associate the audio inputs
with the cameras in Camera Setup as described in
Section 6.2 accordingly.
Audio output
Connect the Audio In/Out Connector to an Audio In/Out Cable, and then
connect the audio output connectors of the cable to the audio line-ins from
speakers. The user may also use HDMI monitor to output audio.
Alarm inputs
Connect the alarm inputs to NC and/or NO type of alarm signals. Please make
sure to setup the alarm configurations in Alarm Setup as described in
Section 6.3
accordingly.
Alarm outputs
Connect the alarm outputs 1-2 to NC type of alarm signals, alarm outputs 3-4 to
NO type of alarm signals.
Ethernet
Connect the Ethernet connector to a standard twisted-pair Ethernet cable for
remote access via LAN or internet. Please make sure to setup the related
configurations as described in
Section 6.10 Network Setup .
USB 2.0 disk drives, DVD+RW, card reader, etc.
If the user wants to use USB2.0 peripheral device to retrieve important recorded
images and/or audio, please connect it to the USB port connectors.