Lexicon 20/20 AD User Manual page 19

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.
External Mode
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.
Error
External Mode
States
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
PRES LOCK
AES / WC:
AES
WC
AES / WC: PRES LOCK
AES
WC
AES / WC: PRES LOCK
WC AES
PRES
AES / WC: LOCK
EXT SYNC
EXT SYNC
EXT SYNC
EXT SYNC
Using the 20/20 AD
Internal and
External modes
15