Tascam X-48 - Manual (Page 15)

Setup
ADAT
When installed into an X-48 Slot, an ADAT digital I/O card will provide 24 channels of I/O
at normal sample rates (44.1k, 48k).
Digital Audio Clock
Any time multiple digital audio devices are connected together, or multiple digital audio
connections are used simultaneously on a single device, all the digital audio clock rates of
the connected devices must be locked together. If this is not done, or if it is done
incorrectly, clicks, distortion, or muted audio may result. The X-48 may act as the master
clock to other devices in a system, or it can lock its clock to an external device.
This section will only deal with the physical connections to achieve clock lock. For system
configuration, please refer to Section 'Digital Audio Clock'(Page 22). Note that all digital
audio clock related connections may be connected simultaneously, with the needed one
selected in the user interface.
If the X-48 is digitally connected to only one other device, the clocks may be locked via that
connection, requiring no other connection be made.
Word Clock
If the X-48 is digitally connected within a system of more than two digital devices, it is
recommended to use Word Clock from one master source, distributed to all devices. The X-
48’s rear panel BNC Word Clock connectors have the following uses:
IN – This connector receives word clock from another device. When used, the X-48 should
be configured to lock to Word Clock.
OUT – This connector transmits word clock to other devices. When used, the X-48 should
be configured to Internal Clock.
THRU – This connector passes the Word Clock signal present at the Word Clock IN
through without adding any delay. This allows three devices to be locked in a daisy-chain
fashion in configurations where there is no way to directly distribute clock from a single
source.
Analog Audio
The IF-AN24X provides 24 channels of balanced analog inputs and 24 channels of balanced
analog outputs. The X-48 can be configured to one of five possible operating reference
levels by applying the appropriate software settings. Please refer to Section 'Analog I/O
Operating Level'(page 24) for details.
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