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D19m Technical Description
Date printed:
30.06.20
D19m E41
2.3.2 D19m MADI – MADI In for Optical Fibre Cable
1.940.511/1.940.512
The MADI card is used as demultiplexer for the MADI input signal in a
D19m rack. The MADI input signal will be converted to the TDM bus.
AESO cards as well as A/D cards (output cards) receive their signals from
the TDM bus. Any MADI channel can be routed to any output card.
The MADI card 1.940.511 is equipped with an optical input (SC connector)
as well as an optical “ through” output. Version 1.940.512 (D19m MADI
RED) has an additional MADI input for redundancy.
In standard applications, the MADI card is synchronized via the AES sync
input of the D19m rack. It generates the required clock signal for the TDM
bus as well as the TTL sync signal for the output cards.
If the MADI card is set to
CLIENT
mode, it will receive the sync and clock
signals from the backplane. If necessary, the sync signal can be extracted
from the MADI stream. However, this method is recommended only for long
distances and stagebox applications, because the fault tolerance is lower and
the jitter is higher (2 PLLs involved). Besides, varispeed is impossible in
such a case.
Via the RS485 interface the MADI card can be remote controlled. In that
case the frame address will be set via the DIP switches on the backplane.
The earlier version 1.940.510 is equipped with an ST connector instead of
the SC connector (jumper diagram at the end of this chapter).
CLOCK
EXTRACT
OPT IN
OPT OUT/
THRU
OPT IN
OPT OUT/
THRU
TAXI
RECEIVER
MUTE DP RAM
ROUTING
RAM
UART
PROCESSOR
CONTROLLER
TDM BUS
TDM BUS
REGISTER
CLOCKS
BUFFER
AES
REC
4 SYNC OUT
RS485
SYNC IN
1.940.512.20 only
SUPPLY
MADI OK
SYNC
CLIENT
For factory testing only!
If inserted:
CLIENT
mode
MADI AES
SYNC
Factory setting
DO NOT CHANGE!