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Hardware Considerations
The BM-A2-64MADI is built in a 2U 19" enclosure. It
is intended to be permanently installed in a standard
19" equipment rack. There are ventilation grilles in
the top, bottom and both sides of the enclosure, and
care must be taken to ensure that these are not
blocked by cables or other equipment when the unit is
installed. Do not install any other items of equipment
immediately above or below to the BM-A2-64MADI;
the use of 1U blanking panels is recommended.
Power Supply Considerations
The BM-A2-64MADI is fitted with two separate,
auto-ranging switch-mode power supplies (PSUs).
The operating voltage range is 100 to 240 V AC,
50/60 Hz. The internal power rails are diode-
paralleled to the two supplies, and the unit will
operate normally if only one PSU is powered or
functional. For maximum protection when using both
PSUs, the two AC inlet cables should be connected
to mains circuits which are as independent of each
other as possible.
If redundant operation is not required, only one AC
supply cable need be connected; either AC inlet may
be used.
Fuses And Ratings
Each of the BM-A2-64MADI's PSUs has an internal
resettable fuse for PSU protection. These fuses
are not accessible to the user. The unit should be
powered from a mains supply (supplies) fitted with an
external HRC-type fuse (High Inrush Current) rated
at 1 A.
Unit Connections
MADI Inputs and Outputs
The BM-A2-64MADI can simultaneously monitor and
convert up to 64 audio channels embedded in the
MADI stream and provide them as both AES/EBU
and AES3-id outputs.
MADI inputs are provided as fibre on an SC type
connector (multi-mode) and coaxial (on BNC). The
characteristic impedance of the coaxial input is
75 ohms.
The selected MADI source is also available as both
fibre and coaxial outputs to simplify the connection
of further equipment. The co-axial MADI output is on
a BNC socket, and is compliant with AES10id-2008.
The characteristic impedance
a nominal data rate of 125Mbps. Transmission
distances up to 50 m are generally achievable. The
fibre loop-through output is provided on an SC type
connector. Recommended fibre types are 62.5/125
µm or 50/125 µm, multi-mode. Transmission
distances of at least 1000 m are achievable.
Note: A single-mode fibre option is available, but only
at time of order.
Bel Digital Audio Limited
Installation
AES/EBU Outputs
The 64 audio channels converted from the MADI
input are available as 32 AES/EBU digital audio
output pairs on four rear panel 25-way female Dsub
connectors [15]. Appropriate channel numbers
are screenprinted on the rear panel adjacent to
each connector. The outputs are balanced and
are compliant with AES3-1992. The diagram
below provides the pinout (which is Tascam digital
compatible):
CHANNEL PAIR
n+1
n+2
n+3
n+4
n+5
n+6
n+7
n+8
To aid installation, an optional AES/EBU breakout
is 75 ohms, at
panel (BOB/O-32) is available from Bel. This consists
of a 1U 19" panel with 16 XLR3M connectors fitted
(32 channels).
PIN
25
Gnd
12
Cold
24
Hot
11
Gnd
23
Cold
10
Hot
22
Gnd
9
Cold
21
Hot
8
Gnd
20
Cold
7
Hot
19
Gnd
6
Cold
18
Hot
5
Gnd
17
Cold
4
Hot
16
Gnd
3
Cold
15
Hot
2
Gnd
14
Cold
1
Hot
n=0, 8, 16, 24
BM-A2-64MADI User Manual v1.0
OUTPUT
9
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