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Apollo x8 Hardware Manual Rear Panel 26
(30) 75 Ohm Word Clock Termination Switch
This switch provides internal 75-ohm word clock input signal termination when required.
Word clock termination is active when the switch is engaged (depressed).
Apollo x8’s termination switch should only be engaged when Apollo x8 is set to sync to
external word clock and it is the last device at the receiving end of a word clock cable.
For example, if Apollo x8 is the last “slave” unit at the end of a clock chain (when Apollo
x8’s word clock OUT port is not used), termination should be active.
(31) Word Clock I/O
Word Clock In
Apollo x8’s internal clock can be synchronized (slaved) to an external master word
clock. This is accomplished by setting Apollo x8’s clock source to Word Clock within the
Console application, connecting the external word clock’s BNC connector to Apollo x8’s
word clock input, and setting the external device to transmit word clock. If Apollo x8 is
the last device in the clock chain, the Termination switch (#30) should be engaged.
Important: Apollo x8’s sample rate must be manually set to match the incoming
clock’s sample rate.
Note: Apollo x8 can be synchronized to an external “1x” clock signal only.
Superclock, overclocking, and subclocking are not supported.
Word Clock Out
This BNC connector transmits a standard (1x) word clock when Apollo x8 is set to use its
internal clock. The clock rate sent by this port matches the current system sample rate,
as specified within the Console application.
When Apollo x8 is set to use external word clock as its clock, Apollo x8 is a word clock
slave. If the incoming external word clock is within ±4% of a supported sample rate
(44.1 kHz, 48 kHz, 88.2 kHz, 96 kHz, 176.4 kHz, 192 kHz), Word Clock Out will mirror
Word Clock In with a slight phase delay (about 40ns).
Because Apollo x8’s word clock output is not a true mirror of the word clock input, word
clock out should not be used to daisy chain the word clock if Apollo x8 is in the middle
of the word clock chain. The correct method to connect Apollo x8 in the middle of a word
clock chain is to use a T-connector at Apollo x8’s word clock input and leave Apollo x8’s
word clock output unconnected. In this configuration, the Termination switch should not
be engaged.
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