Qualis Audio Sentine, User Manual, Page: 90 / 108

84 User Manual
The Sentinel’s audio and auxiliary signals connectors are designed
to work with standard cables for typical configurations. The following
specifications and guidance are provided for those cases where cus-
tom cabling is necessary.
AES digital audio connections
AES connections appear
on an HD15 connector. 1. Channels 1-2 high.
2. Channels 3-4 high.
3. Channels 5-6 high.
4. Ground.
5. Ground. 6. Channels 1-2 low.
7. Channels 3-4 low.
8. Channels 5-6 low.
9. Balanced/Unbalanced.
10. Channels 7-8 low.
11. Ground.
12. Ground.
13. Channels 7-8 high.
14. Output (in/out only).
15. Ground.
The AES input and input/output connectors on the AES audio module,
and the AES input/output connector on the SDI audio module share a
common pin configuration and electrical charateristics. The AES input/
output connectors provide a coded audio output that is not present on
the input connector.
The AES audio connections by default operate with unbalanced inputs.
The inputs are terminated in 75 Ω and accept up to 1Vpp. Pin 9 on the
connector must be shorted to ground to invoke balanced operation.
This changes the input impedance to 120 Ω and pads the amplitude
to accommodate 5Vpp signals. Both modes are transformer isolated,
allowing operation without concern for ground loop issues.