D21m System
6-26 D21m Modules Date printed: 30.08.07
Current consumption (3.3 V) 0.2 A
(5 V) 0.8 A (1.949.443); 1.3 A (1.949.444)
Operating temperature 0...40° C
(must ALWAYS be fitted)(fitted on 1.949.444 ONLY)
ON OFF ON OFF
OFF
ON OFF ON OFF
LEDs: M1 / M2 Indicate that a valid AES/EBU signal is detected on main input 1/2.
P1 / P2 Indicate that a valid AES/EBU signal is detected on fallback input 1/2.
Note: These LEDs do not indicate Dolby
®
E status, but just the lock status of the
AES/EBU inputs on the front panel.
DIP Switches: S2.1 ... S2.3
S2.1 S2.2 S2.3 Module 1 Input Select
x x OFF
Automatic source selection (factory default: All OFF)
OFF OFF ON
Front port main
OFF ON ON
Front port PCM delay
ON OFF ON
Rear (backplane / fallback) main
ON ON ON
Rear (backplane / fallback) main
While it is possible to manually select individual inputs both from the front
panel connectors as well as from the console-internal patch, the card hosts an
automatic source selection mode where the inputs are chosen automatically
according to the following priorities:
• Whenever a valid AES/EBU signal is detected (“locked” status) on the 15-
pin front panel connector, this input has priority over the console-internal
patch sources. Hence if it is requested to feed the decoder with a console-
internal signal selected via the patch window, no valid AES/EBU input
signal is allowed on the front panel connector.
• However, if no valid AES/EBU signal is detected on the front panel inputs,
the card is getting its inputs from the console-internal patch. These inputs
are referred to as “Rear/Backplane Inputs”. Selection is as follows:
- Input 1, 2: Main priority input for Dolby
®
E signal, decoder 1.
- Input 3, 4: Backplane input of decoder 1; is automatically selected in
case no Dolby
®
E signal is present on main input (1, 2). Please note that
a Dolby
®
E signal can be fed into this input, too, and it will be decoded
correctly. However, if a Dolby
®
E signal is detected on the main input,
this will be taken with higher priority.
