D21m System
6-42 D21m Modules Date printed: 23.01.09
6.5.2 HD RS422 Card ( ) 1.949.415
HD: The D21m HD RS422 card provides the link to the DSP core systems. Each
input and output can handle up to 96 channels in each supported sampling
frequency (in combination with the Performa core, the number of I/O chan-
nels is restricted to 48). The system clock used is taken from the host DSP
system, so no extra synchronization is needed.
The card detects all other I/O cards that are inserted into the D21m system
and displays their presence on the front panel of the frame. Once all audio
interface cards are plugged in, pressing the RECONFIG key on the front panel
confi rms the confi guration to the system. Then all cards are activated and
their audio signals are fed into the HD link.
RS422: RS422 serial control data from the HD link may be transmitted either to the
card’s RS422 port (then, the controller is connected to the backplane for use
with merger), or to the controller (then the RS422 port is deactivated); selec-
tion is done with a DIP switch.
The pinout of the RS422 connector can be set to “device” or “controller” with
a DIP switch, depending on the 3
rd
-party serial device connected.
Host link interface cable type CAT-5 UTP Cable
Cable length up to 10 m
Connector RJ-45
Capacity of one CAT-5 connection 96 channels
Max. RS422 cable length 1000 m
Current consumption (3.3 V) approx. 600 mA
(5.0 V) <50 mA
Operating temperature 0...40° C
HD Link In 1
HD Link In 2
HD Link Out 1
HD Link Out 2
Audio
Clock
Regen.
Channel Selector
Channel Selector
PERFORMA
MODE
Switch
NO
MERGER
Switch
UART
Embedder/
De-embedder
Controller
NVRAM
MUX
OFF ON OFFON
DE-
MUX
48
RS422
Port
115.2 k
8, N, 1
Backplane Connector
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