Linear Acoustic LA-5448, User Manual

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Linear Acoustic LA-5448 AC-3 Frame Synchronizer/Rate Shaper User Guide Connections
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2.3 Rear Panel
The rear panel of the Linear Acoustic LA-5448 contains all signal and power I/O.
WARNING: Replace fuses only with the same type and rating
2.3.1 Connection Ports
All of the LA-5448’s connections are on the rear panel and are described in detail below.
See Chapter 5: Specifications for specific pinouts.
Figure 2-1
Rear Panel
• Remote: This RS232/485/422 port is used for software upgrades as well as serial
remote control of the unit.
• Status: This is the GPI/O connection for parallel control of the unit. There are
four GP Inputs and four GP Outputs whose function, polarity, and type (i.e. held
or momentary) are adjustable via the front panel user interface. FUTURE
• Main Inputs (PGM 1-PGM 3) : Connect the AC-3 signals that are to be pro-
cessed to these connectors. During power on and in the unlikely event of failure,
these inputs will be hard relay bypassed to the corresponding output connectors
located below each of them.
• REF/PGM 4: Apply 48 kHz AES reference, either PCM or AC-3.
WARNING: A reference AC-3 signal MUST be connected to REF/PGM 4 at all times for proper
operation. Plain AES reference can also be used.
• Main Out Pgm 1-4: Main AC-3 (Dolby Digital) programs one through four.
During boot up or in the event of failure, the Main Input connector directly
above each output will be hard relay bypassed to it.
NOTE: Front panel LEDs indicate input signal condition: Off=No Signal present,
Orange=AES sync detected but no AC-3, Green=OK.