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Operation, cont'd
Depending on the switcher model, the input buttons blink or light sequentially
to indicate the approximate volume of the selected output. Volume is defined as
a percentage of the input audio signal that is applied to the output. From 0% of
volume, the first Esc (
5.5% on, each Esc (
•
•
• Push Esc (
When all input buttons are lit, the audio output is 100% of the audio input level.
Another way to view the volume level is to think in terms of the attenuation that
is applied to the output. Attenuation reduction is indicated by the lit or blinking
input buttons: when fewer input buttons are lit, attenuation is greater (and the
volume is quieter).
•
•
•
•
See the table on the previous page to read the volume display.
3-42
MTPX Plus Twisted Pair Matrix Switchers • Operation
>
) button push applies 5.5% of the input audio signal. From
>
) push applies 1.5% more of the input audio signal to the output:
>
) button again — 5.5% + 1.5% = 7% volume
Push Esc (
Switchers with 16 input buttons — Indicated by the Input 1 button
blinking slowly
Switchers with 32 input buttons — Indicated by the Input 1 button lit
steadily
Push Esc (
>
) button twice more — 7% + 1.5% + 1.5% = 10% volume
Switchers with 16 input buttons — Indicated by the Input 1 button lit
steadily
Switchers with 32 input buttons — Indicated by the Input 1 and Input 2
button lit steadily
>
) button nineteen times more — 10% + (19•1.5%) = 38.5% volume
Switchers with 16 input buttons — Indicated by the Input 1 through 5
buttons lit steadily and the Input 6 button blinking
Switchers with 32 input buttons — Indicated by the Input 1 through
Input 11 buttons lit steadily and the Input 12 button blinking
At minimum volume, all input buttons are unlit or background illuminated
and 76 dB of attenuation is applied to the output. The audio output is
effectively muted.
The first step of volume increase causes the Input 1 button to blink slowly.
Attenuation is reduced by 13 dB (63 dB of attenuation is applied to the
output). There is no change in the volume indication.
The second step of volume increase reduces the attenuation by an additional
1 dB (62 dB of attenuation is applied to the output). The front panel display
is unchanged.
Successive steps of volume increase cause consecutive input buttons to first
blink and then light steadily.
For example: When lit steadily, the Input 3 button indicates the following,
depending on the number of input buttons the switcher has:
Switchers with 16 input buttons — 52 dB of attenuation when compared
to the Input 3 button blinking (53 dB to 55 dB of attenuation). The
blinking Input 4 button (49 dB to 51 dB of attenuation) is at least 2 dB less
than the blinking Input 3 button (53 dB minus 51 dB) and at most 6 dB
less (55 dB minus 49 dB).
Switchers with 32 input buttons — 58 dB of attenuation when compared
to the Input 3 button blinking (59 dB of attenuation). The blinking
Input 4 button (57 dB of attenuation) is 2 dB less than the steadily-lit
Input 2 button (59 dB minus 57 dB).
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