26
Installation
The ADX-2400D is designed to be installed in a standard 19" equipment rack.
There is a cooling fan on the rear panel which draws air in through the sides of the
cabinet and exhausts hot air through the rear panel. The unit should not be installed
in such a way as to block the vents on the side panels, or air flow from the rear panel
fan.
The unit is designed to operate on 95-250 volts AC, 50 or 60 Hz. The power supply
is an wide-range switching supply, so no voltage selection needs to be made.
Power consumption is approximately 15 watts.
The AES audio input and output connections are made through BNC connectors on
the rear panel. Each BNC connector corresponds to an AES pair, i.e. Input 1 is the
connector for channels 1 and 2, Input 2 is the connector for channels 3 and 4, etc.
The input connectors are AC-terminated in 75 ohms (you won’t see this termination
with a DC meter), and require a nominal 1 volt p-p AES signal. The outputs provide
a 1 volt p-p signal into 75 ohms. Inputs and outputs correspond to the AES specs
for unbalanced (BNC) transmission.
The AES Reference Input is also a 75-ohm terminated input, requiring nominally 1
volt p-p. The applied signal should be AES Silence, Tone, or other AES signal. The
input is not designed to accept 48-Khz word clock. The 12 outputs will be frequency
and phased locked to this reference regardless of input or network timing.
There are no restrictions on the timing or locking of any of the 12 input signals.
They will be syncronized in the unit to the network clock.
All AES audio into the ADX-2400D should have emphasis turned off, as emphasis is
not supported internally. The output channel status bits will indicate NO EMPHASIS.
The coax cables should be supported in such a way as to prevent weight being
applied to the rear of the ADX-2400. The rack mounting flanges are sufficient to
support the unit itself, but not additional loading of the heavy I/O cables.
The Ethernet 'Audio Network' ports (one or both) should be connected to the
network with standard CAT5 RJ-45 cables, following normal IT practice. The ports
are 100/baseT Ethernet. The connectors on the ADX-2400 are wired with the same
pinout as normal PC ports, and are not auto direction sensing. If connecting two
units together without a switch, a crossover cable must be used.
It is not possible to 'daisy-chain' units together. The two ports do not function as
'loop-through'. Each unit should be connected to a separate switch port.
The maximum length for 100/baseT Ethernet on copper is 100 meters. For longer
runs there must be a repeater (switch) or media converter (fiber) in the path. See
the Cobranet website (
www.cobranet.info
) for more information.
