D19m Technical Description
Date printed:
30.06.20
D19m E55
2.5
ADAT I/O Cards
2.5.1
D19m ADATI – Dual 8-Channel ADAT In
1.940.490/1.940.491
Two optical ADAT inputs are routed to the TDM bus, where they are read
from a MADO card and can then be output through a MADI link.
The card 1.940.491 is equipped with additional AES/EBU outputs for
standalone applications. For this purpose, also an AES/EBU receiver for
synchronization, output transformers, and drivers are provided.
The input sampling frequency can be between 25 kHz and 55 kHz.
The ADAT format does not contain channel status information, the C-bits
are set to default (not indicated). Max. 24 bits of audio are transmitted.
The TDM output occupies the addresses of 4 slots (16 signals). The ad-
dresses are set via DIP switches. If only one optical input is needed, it is
possible to use eight TDM signals only by setting a jumper (8/16CH).
Synchronization:
The synchronization comes usually from the TDM bus. In standalone appli-
cations an AES/EBU sync input or the optical input provides the synchroni-
zation.
Configuration:
On standard cards, the card address is given by the physical slot on the
backplane itself; this means that the card in slot 0 occupies the channels 1 to
4, the second slot corresponds to channels 5 to 8, etc. Since the ADAT card
provides 16 inputs instead of 4, the card addresses have to be configured via
DIP switches (card addresses 0 to 12).
Please be careful to correctly set the card addresses because of potential
conflicts with other cards. Typically, the lower slots are used for standard
4-channel cards; the ADAT interfaces are moved to the higher addresses.
DIP Switch
Card
address
CH no., single
input used
CH no., both
inputs used
1
2
3
4
0
1...8
1...16
on
on
on
on
1
5...12
5...20
off
on
on
on
2
9...16
9...24
on
off
on
on
3
13...20
13...28
off
off
on
on
4
17...24
17...32
on
on
off
on
5
21...28
21...36
off
on
off
on
6
25...32
25...40
on
off
off
on
7
29...36
29...44
off
off
off
on
8
33...40
33...48
on
on
on
off
9
37...44
37...52
off
on
on
off
10
41...48
41...56
on
off
on
off
11
45...52
not allowed
off
off
on
off
12
49...56
not allowed
on
on
off
off
OPTO IN 1
OPTO IN 2
SYNC
CONTR
SYNC
CONTR
CONTROLLER
CONTROLLER
AES OUT 1-4
AES OUT 5-8
1.940.491.20 ONLY
1.940.491.20 ONLY
BUFFER
TDM BUS
CLOCKS
Содержание D19m
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