Date printed: 24.01.12
6
D21m System
play it within the console’s system surveyor page. This is without sacrificing
any audio channels within the MADI link. Additionally, an RS422 signal can
be ‘tunneled’ through the MADI connection. In this way e.g. a MIDI device
can be connected to the remote I/O box and find the ‘extension’ connector
on the hub frame next to the core again.
Notes
Unlike the Studer D19m I/O system, the D21m system is engineered as an
I/O system for use together with a Studer digital console, i.e., using the D21m
system as a ‘standalone’ analog-to-digital or digital-to-analog converter only
works if MADI I/O is used on the digital side; for more information on this
subject please
refer to chapter 5.7
. Inserting, e.g., an AES/EBU card and a
Line input card and getting the A/D-converted signal out of the AES/EBU
card directly is not possible. This can be done only if the audio is routed with
a DSP core. Since the MADI signal to the D21m remote I/O box is used to
synchronize the unit, a stable, low-jitter MADI signal is necessary in order
to reach maximum audio quality. This is guaranteed by Studer equipment.
However, two I/O boxes can be interconnected using MADI, where one of
them must be switched to ‘Master’ mode. In such a case up to 64 audio chan-
nels may be transmitted between two frames (applicable for MADI HD cards
A949.0411.23, A949.0413.22, A949.0414.20, or newer).
2.2 The Frame and Its Cards
I/O Example:
3 Dual Card Slots
Rear View:
Front View:
I/O Example:
1 Dual-Slot Card
4 Single-Slot Cards
Main and Redundant
Power Supply
1...2 HD Link Cards
(Link to DSP Core)
RS422 Serial
I/O Card
The 3 U frame provides 12 slots for I/O card insertion. Each card may pro-
vide a different number of I/O channels, depending on its capabilities (e.g.
a microphone card provides four channels of microphone inputs, while an
ADAT card provides 16 channels of inputs and outputs simultaneously).
Some cards are mechanically occupying two slots, and therefore a maximum
of 6 double-width cards may be inserted into a frame. An overview of the
different cards currently available is given in
chapter 6.1
.
