Realtime Rack Manual
Chapter 2: Hardware
24
Rear Panel (continued)
.
UNIVERSAL AUDIO, INC.
PORT 1
( )
PORT 2
( )
1394b 1
1394b 2
ON
OFF
MADI IN
IN
PSU 1
100V-240V
0.30A 50-60 Hz
PSU 2
100V-240V
0.30A 50-60 Hz
DESIGNED IN CALIFORNIA • MADE IN CHINA
SOUNDCRAFT
REALTIME RACK
1
2
3
4
5
6
7
8
9
(3) Thunderbolt Ports
Connect a Thunderbolt cable (not included) between one of these ports and the Thunder-
bolt port on the Mac host computer that is running the Realtime Rack software applica-
tion. The HOST indicator on the front panel is lit when the connection is established.
Either port can be used for the host computer connection (the port numbers are inconse-
quential). The other port remains available for other Thunderbolt connections, for exam-
ple additional Realtime Rack units or the Apple Thunderbolt to Gigabit Ethernet Adapter.
(4) Word Clock Out
This BNC connector transmits a standard (1x) word clock when Realtime Rack is set to
use its internal clock. The clock rate sent by this port matches the current system sam-
ple rate, as specified in the Hardware tab within the Realtime Rack software application.
When Realtime Rack is set to use external word clock as its clock, Realtime Rack is a
word clock slave. If the incoming external word clock is within ±0.5% of a supported
sample rate (44.1 kHz, 48 kHz, 88.2 kHz, 96 kHz), Word Clock Out will mirror Word
Clock In with a slight phase delay of about 40 nanoseconds.
(5) Word Clock In
Realtime Rack’s internal clock can be synchronized (slaved) to an external master word
clock. This is accomplished by setting Realtime Rack’s clock source to Word Clock in the
Hardware tab within the Realtime Rack software’s Settings view, connecting the external
word clock’s BNC connector to Realtime Rack’s word clock input, and setting the exter-
nal device to transmit word clock. If Realtime Rack is the last device in the clock chain,
the Termination switch (6) should be engaged.
Note: Realtime Rack can be synchronized to an external “1x” clock signal only.
Superclock, overclocking, and subclocking are not supported.
