Orban OPTIMOD-FM 8600Si, Operating Manual

Page: 35 / 356

OPTIMOD-FM DIGITAL INTRODUCTION
1-9
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Two digital AES3 left/right outputs.
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Analog left/right inputs.
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Analog left/right outputs, which can be switched independently to carry the fol-
lowing signals: FM analog processed without diversity delay, FM analog proc-
essed with diversity delay, digital radio processed, or low delay monitor.
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Composite stereo outputs.
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Subcarrier (SCA and RDS/RBDS) inputs.
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A 75
Ω
sync reference input that can accept 10 MHz or 1 x wordclock (32, 44.1, 48,
88.2, and 96 kHz) and lock the digital output sample rate and the 19 kHz pilot
tone frequency to this input.
Digital AES3 Left/Right Input/Output
The digital inputs and outputs conform to the professional AES3 standard. They
have sample rate converters to allow operation at 32, 44.1, 48, 88.2, and 96 kHz
sample frequency.
The left/right digital input is on one XLR-type female connector on the rear panel;
the left/right digital outputs are on XLR-type male connectors on the rear panel.
OPTIMOD-FM provides digital and analog inputs and outputs. You select whether
OPTIMOD-FM uses the digital or analog input either locally or by remote interface.
If OPTIMOD-FM is set to accept a digital input and the feed fails, OPTIMOD-FM will
automatically switch back to the analog input.
Level control of the AES3 input is accomplished via software control through System
Setup (see step 5 on page 2-28) or through PC Remote.
Both analog and digital outputs are active continuously.
The 8600Si’s output sample rate and 19 kHz pilot tone frequency can be locked to
the 8600Si’s internal crystal clock, to the sample rate present at its AES3 input, or to
a compatible reference signal (10 MHz or 1 x wordclock) applied to the sync refer-
ence input.
The 8600Si can apply J.17 de-emphasis to signals received at its digital input and J.17
pre-emphasis to the processed signal emitted from its digital output.
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2
J.17 is a 6 dB/octave shelving pre-emphasis/de-emphasis standard with break points
at 400 Hz and 4 kHz. It is used mainly in older studio/transmitter links that use
NICAM technology. The 8600Si’s provisions for J.17 make it fully compatible with sys-
tems using this standard.