ENGLISH
9
Using the ISA 428 with a Digidesign 192
HD™ interface
The ISA 428 can be used with the Digidesign 192 HD™
interface in one of two ways as follows:
Analogue mode
The XLR analogue outputs of the ISA 428 can be connected
to the +4dBu balanced 25-way DB25 connector, labelled
‘Analog Input’, of the HD interface using a DB25 to 8 off
female XLR cable. These cables are available directly from
Digidesign or from Hosa cable (part no. DTF 805).
N.B. Digidesign cables are also available as follows:
Description Part no
DB25-XLR M+F AES/EBU Snake, 12' MH080
DB25-XLRM Snake, 12' MH081
DB25-XLRF Snake, 12' MH082
DB25-TRS Snake, 12' MH083
DB25-XLR M+F AES/EBU Snake, 4' MH097
DB25-XLRM Snake, 4' MH098
DB25-XLRF Snake, 4' MH099
DB25-TRS Snake, 4' MH100
The ISA 428 ADC level meters are calibrated to show 0dBfs
at +22dBu and the HD interface unit can be calibrated such
that it too indicates 0dBfs at +22dBu which will make
interfacing and level checking between the two units easier.
To recalibrate the HD unit follow the instruction described
in the Digidesign 192 HD™ user guide under ‘192 I/O
Calibration Mode Instructions’.
Digital Mode
Connecting the ISA 428 AES digital output 9-way connector
to the HD unit 25-way ‘AES/EBU I/O’ connector requires
two cables. The Focusrite ISA 428 9-way cable to 4 off XLR
is required to retrieve the AES signals from the ISA 428
ADC card, and this should be connected to the AES input
connectors on the Digidesign 25-way to AES I/O XLR cable.
This cable is available directly from Digidesign and is called a
‘DB25-XLR M+F AES/EBU DigiSnake™’.
Note on HD AES channel restriction
The AES/EBU DB25 way connector on the rear of the HD
unit can accept 8 channels of AES/EBU digital data over four
AES cables for speeds up to 96kHz. However, for speeds
over 96kHz (up to 192kHz) the four AES inputs of the HD
interface can only accept 4 channels of audio data.
When the ISA 428 is operating at speeds up to 96kHz a
single Focusrite 9-way to AES XLR cable can route all 8
channels of its digital audio into the HD interface. When the
ISA 428 is operating at 176.4 to 192kHz a single Focusrite
9-way to AES XLR cable can only route 4 channels of its
digital audio into the HD interface. Depending upon which
9-way connector the Focusrite cable is attached to on the
ADC card, either channels 1 to 4 or 5 to 8 can be routed
into the HD unit.
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