Krell Industries Digital to Analog Processor STUDIO 2 Owner's Reference Manual page 11

OPERATION
INPUT SELECT SWITCHING
The STUDIO 2 has multiple digital inputs. Each input has its own
input switch and direct path to the digital Processor. When an
input is selected, the corresponding LED will illuminate.
AT&T
TOSH
XLR
COAX1
COAX 2/ST
AT&T fiber optic input
Toshiba fiber optic input
Balanced AES/EBU digital input
Coaxial input
Coaxial input or Optional-2nd AT&T ST input
SYNC INDICATOR
When the input signal locks with the Processor, the SYNC LED
will illuminate. The input frequency is automatically selected by
the Processor. As an example, if you select the AT&T input from
a CD transport, the 44.1 KHz frequency will automatically be
selected and the SYNC LED will illuminate. The STUDIO 2 will
accept and automatically adjust to 38.0 KHz, 44.1 KHz, and 48.0
KHz input frequency signals.
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