Operating instructions

GUIDE TO INSTALLATION AND OPERATION
24 | AAP-1741
3.3.8 Reference Input
Reference – Desired:
Use a radio button to select a reference signal for
the AAP-1741. The reference sources are placed
by order of priority where ABUS has the highest
priority. The absence of the selected reference is
an error condition.
• Select Auto in the header bar to
automatically select the highest-priority
reference present and valid.
Reference – Current:
This section indicates the current reference used
by the AAP-1741. Many reference sources may be
present and valid. When a valid reference is not
present, the AAP-1741 reverts to Free-Run mode
(this is an error condition).
Reference – Presence:
Five dedicated presence indicators display the
valid reference sources: one for a reference card
REF-17xx in slot 10 of the Densité frame, one for
a reference card REF-1xxx in slot 20, and one for
a valid AES1 input signal.
The URS is a single signal that is capable of
distributing to all cards in a Densité frame a
frequency reference and frame alignment
references for all video and audio signals.