Date printed: 24.01.12
35
D21m System
Factory Default Setting:
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
not fitted
not fitted
OFF
OFF
OFF
OFF
LEDs
LOCK 1-8
These green LEDs are on if a valid AES/EBU signal is available at the inputs.
DIP Switches
S1 (C+U Bits in Audio)
Specifies the usage of the ZCU bits. If OFF, the audio is standard 24 bit PCM;
if ON, the LSBs of the audio carry the ZCU bits. This setting both defines at
what position the ZCU bits are inserted (receiver) and which bits are used to
generate the transmitted ZCU bits (transmitter). Default setting: all OFF.
S2 (C+U Bits Source)
If OFF, a static, default ZCU pattern is generated at the transmitter side. If
ON, the ZCU bits of the routed source (position depending on setting of S1)
are used. Default setting: all OFF.
S3 (Input SRC Bypass)
(A949.0455 and A949.0456 only)
Bypassing (ON) or enabling (OFF) of the
SRCs for individual AES/EBU input channels (i.e. audio channel pairs 1+2,
3+4, etc.). Default setting: all OFF.
S4 (Output SRC Bypass)
(A949.0456 only)
Bypassing (ON) or enabling (OFF) of the SRCs for indi-
vidual AES/EBU output channels (i.e. audio channel pairs 1+2, 3+4, etc.).
For output word length reduction the output SRCs must be enabled. Refer to
the paragraph below.
Default setting: all OFF.
S5, S6 (Output Sample Rate)
(A949.0456 only)
Used for setting the sample rate for the AES/EBU output
channels (i.e. audio channel pairs 1+2, 3+4, etc.). Corresponding switches
on S5 and S6 are used in pairs for each AES/EBU channel, according to the
following table and the silkscreen on the PCB. Default setting: All OFF, cor-
responding to 48 kHz.
S5.x
S6.x
Output Sample Rate
OFF
OFF
48 kHz
OFF
ON
96 kHz
ON
OFF
44.1 kHz
ON
ON
External AES sync
If no valid signal is provided at the
AES EXT SYNC IN
connector but exter-
nal sync is selected, the output sampling rate will be set to the system clock.
Outputs set to ‘external’ can therefore be used in a very flexible way: Connect
