GRASS VALLEY APEX -, Installation And Service Manual

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APEX — Installation and Service Manual 47
Facility Interface
Facility Interface
Audio Signals
The multi-format support of the Apex router includes AES digital audio
75 Ohm unbalanced, and AES digital audio 110 Ohm balanced. Multi-
plexed Audio Digital Interface (MADI)
1
and Dolby E support is provided.
The Apex chassis can accommodate four types of I/O boards:
• 75 Ohm
,
32 input pairs
• 75 Ohm
,
32 output pairs
• 110 Ohm
,
32 input pairs
• 110 Ohm
,
32 output pairs
A 256 x 256 75 Ohm system with eight input boards and eight output
boards is shown on Figure 3 on page 33 .
A 256 x 256 110 Ohm system with eight input boards and eight output
boards is shown on Figure 4 on page 34 . (Pinouts for the D connectors are
shown on Figure 35 on page 87 .)
The Apex system can automatically detect a signal’s type (synchronous or
asynchronous), its rate (from 30 kHz to 100 kHz), and then switch it prop-
erly—without any additional modifications or intervention. It can also
switch a signal that has lost its reference.
Apex routers utilize a silent-switching design to minimize unwanted clicks
and pops. You can turn this feature on or off as needed.
The Apex architecture allows a control system to view the router as either
a single-level stereo system in which the pairs always switch together, or as
a two-level stereo system, which allows the Apex system to support a full
complement of audio pair manipulation modes, including normal, mix,
and reverse.
1.
See MADI Support on page 53 .