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OPERATING INSTRUCTIONS FOR THE INT202 FIREWIRE INTERFACE
Page
13
Date: 03/10
THE INT202 FIREWIRE INTERFACE
Features
Inputs:
There are two Firewire connectors in order to be able to
chain more Firewire based units on a single Firewire bus.
Which of the two Firewire connectors is used for the
connection to the computer is not relevant. The accepted
sampling frequencies are 44.1, 48, 88.2, 96, 176.4 or
192 kHz.
Outputs:
There are two AES/EBU outputs on a pair of XLR and a
pair of RCA connectors. The XLR and RCA connectors are
fed from the same source, but have separate output
stages. They can be used simultaneously.
The single / dual wire switch allows to switch the
AES/EBU output to the so called dual wire format. If
switched to dual wire, the two XLR connectors become
channel 1 and channel 2 respectively of the audio signal
(same with the RCA connectors). This is the case only at
176.4 or 192 kHz sampling rates. All other rates are not
influenced by the single / dual wire switch, i.e. the
format is single wire. Certain equipment (CD transports,
DACs) support 176.4 / 192 kHz sampling rates only via
the dual wire interfaces. In single wire mode all four
connectors carry the same signal. All four can be used
simultaneously.
Synchronization:
The synchronization master always is the INT202 device,
i.e. the computer is slaved to the INT202. The sampling
rate is set via the Weiss Firewire IO window. On a Mac
system the sampling rate set in AudioMidi sets the one in
the Weiss Firewire IO window and vice versa. With the
proper (advanced) player software the sampling rate of
the INT202 is switched automatically depending on the
track played. For more information on this topic see the
paragraph on bit transparency checking. The INT202’s
intrinsic jitter is very low.
Power Supply:
The power can be either supplied from the Firewire bus
or from the external power supply supplied with the
INT202.
Firewire bus power may or may not be available with the
particular computer used. Refer to the computer manual
to find out. If the Firewire connector at the computer is a
4 pin type then bus power is not available by definition.
With the other types of connectors (6 pin or 9 pin) bus
power may be available.