Date printed: 24.01.12
17
D21m System
5.4 96 kHz Operation
D21m Frame
The D21m I/O system is fully supporting 96 kHz operation. For digital for-
mats, the following standards are supported:
AES/EBU
2 channels are sent over one cable, both at 48 kHz and 96 kHz, just by dou-
bling the clock frequency of the transmitted signal in 96 kHz operation.
MADI
0-64 channels are transmitted at 48 kHz (depending on the DIP switch set-
tings), and 0-32 channels are transmitted at 96 kHz. In the latter mode, the
clock frequency is doubled to 96 kHz, similar to the AES/EBU format. In
order to reach 64 channels of transmission between remote I/O boxes and the
hub frame at 96 kHz, the card’s redundant MADI connections can be selected
to transmit the ‘lost’ half of the first cable. This is done by a DIP switch on
both the MADI I/O and the MADI HD cards.
ADAT
At 96 kHz, only 8 channels are transmitted (4 per optical interface).
TDIF
At 96 kHz, only 8 channels are transmitted.
MADI HD
If more than 32 channels are required in 96 kHz mode, the AUX interface
must be used as a ‘channel extension’ to the main interface (i.e., DIP switch
#1 is OFF); it will then transmit channels 33-64 of the 96 kHz MADI signal.
Subsequently, MADI connection redundancy will not be available in 96 kHz
mode when exceeding a total channel count of 32 into or out of the remote
I/O box.
Performa Core
•
For 96 kHz operation, the DSP core must only contain PE and PED21m cards
and a MemNet card type A950.0621xx
(not A950.0620xx)
or newer.
•
In addition, the Performa core must contain a ‘Revision A’ backplane.
•
An external, high-quality (low-jitter) 96 kHz sync signal in AES/EBU format
must be provided.
•
The session configuration has to be re-calculated. Some I/O channels may
then have no audio but will still show up in the patch window. This is due to
the fact that some I/O cards (e.g. ADAT) will provide only half the number
of audio channels at 96 kHz.
48 kHz
96 kHz
I/O Card Configuration
(from Left to Right)
HD Link
Channel Usage
I/O Card Configuration
(from Left to Right)
HD Link
Channel Usage
AES/EBU
(16 Channels)
1-16
AES/EBU
(16 Channels)
1-16
ADAT
(16 Channels)
17-32
ADAT
(16 Channels)
17-32
(25-32 no audio)
Line Input
(8 Channels)
33-40
Line Input
(8 Channels)
33-40
Mic/Line Input
(4 Channels)
41-44
Mic/Line Input
(4 Channels)
41-44
Mic/Line Input
(4 Channels)
45-48
Mic/Line Input
(4 Channels)
45-48
Please note that the Studer proprietary HD link is providing 96 channels of
inputs to and 48 channels of outputs from the Performa core, in both 48 kHz
and 96 kHz operation.
