15
Using the 20/20 AD
20/20 AD User Guide
The 20/20 AD is shipped configured for Internal mode. To operate in External
mode, press EXT SYNC until the desired sync source (WC or AES) lights. If the
selected sync source light flashes and the PRES light is not on, it indicates that
there is no signal present as a sync source. If the selected sync source and
PRES lights are on, but the LOCK light is off, the selected sync source is present,
but is not within the 41-51kHz lock range.
With WC selected as the external sync source, the front panel SAMPLE RATE
switch determines the setting of the AES and S/PDIF Channel Status sample
rate bits,
not the actual sample rate, which tracks the external sync source. It is
important to make sure that the sample rate selected at the front panel agrees
with the external sync source, as some digital tape recorders determine sample
rate from the
Channel Status bits rather than from the actual sample rate.
Internal and
External modes
External Mode
AES / WC:
EXT SYNC
WC
AES
PRES
LOCK
To operate in Internal mode, press EXT SYNC until the WC and AES lights are
both off. Then press SAMPLE RATE until the desired sample rate lights. In
Internal mode, the PRES light indicates that
either WC or AES is available as an
external sync source.
Internal Mode
AES / WC:
EXT SYNC
PRES
WC
AES
LOCK
External Mode
Error
States
AES / WC:
EXT SYNC
AES / WC:
EXT SYNC
WC
PRES
LOCK
AES
WC
LOCK
AES
PRES
