2. Installing audio modules:
Audio modules must be installed in slots 15, 16, 17, or 18 (color coded black).
Up to four Audio modules can be installed per Phoenix node.
The channel sequence is as follows:
Slot 15, top RJ45 connector is assigned to Channel Inputs 1 and 2.
The second RJ45 connector gets assigned to Channel Inputs 3 and 4.
The third RJ45 connector gets assigned to Channel Outputs 1 and 2.
The bottom RJ45 connector gets assigned to Channel Outputs 3 and 4.
Subsequent modules, placed in slots 16, 17, and 18 are assigned
to Channels 5-8, 9-12, and 13-16 respectively.
If a low audio level causes the output
audio signal to degrade, the input
sensitivity of the A8920A can be
increased by switching to the 8 dBu
maximum scale.
You can set the transmitter input to
8 dBu and the receiver output to 18
dBu to add 10 dB of gain to the
system, however, this also increases
system signal-to-noise ratio (S/N).
AUDIO INPUT RANGE
Ch A
Ch B
Ch C
Ch C
Low
High
ON
S3
Low
High
ON
S4
AUDIO OUTPUT RANGE
Ch A
Ch B
Low
High
ON
S7
Ch C
Ch D
Low
High
ON
S8
Low
High
ON
S5
Low
High
ON
S6
Note: Two switches per channel
Note: One switch per channel
AUDIO INPUT TERMINATION
Ch A
Ch B
High Z
600Ω
ON
S1
Ch C
Ch D
High Z
600Ω
ON
S2
Note: One switch per channel
Figure 2. Audio Level Switch Positions
The A8920A units are shipped
with the input impedance set
at (high-Z). To select a 600Ω
input impedance in place of the
high-Z input, set switches SW1
and SW2 on the audio to 600Ω.
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