Studer D21m - 96 Khz Operation

D21m System
Additional Info 5-3Date printed: 11.07.07
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 fi rst 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 1.950.621.xx (not 1.950.620.xx) 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 confi guration 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 Confi guration
(from Left to Right)
HD Link
Channel Usage
I/O Card Confi guration
(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.
(( zu: MADI HD, am Anfang des Abschnitts))
The MADI HD card versions 1.949.411.21/1.949.413.21 and newer support
operation with two MADI HD cards in one frame. This gives the possibility
to extend the total channel count between the hub frame and the remote I/O
box to 128. The same channel count is reached in 96 kHz mode.