Linear Acoustic LA-5291 Instruction Manual

LINEAR ACOUSTIC LA-5291
Professional Audio Encoder
INTRODUCTION
Congratulations on your purchase of the Linear Acoustic LA-5291 Professional Audio Encoder.
The LA-5291 provides decoding, encoding, and transcoding to and from PCM and select Dolby® coded
formats for up to 16 audio channels in support of real-time immersive Dolby Atmos® workflows. This
includes:
•Decoding Dolby ED2 to PCM
•Transcoding Dolby ED2 to Dolby Digital Plus JOC and Dolby E to Dolby Digital Plus
•Encoding PCM to Dolby Digital, Dolby Digital Plus JOC, and Dolby ED2
In the OB truck, the LA-5291 can encode a Dolby Atmos mix into either Dolby ED2 for backhaul to the
network center or directly to Dolby Digital Plus JOC for direct transmission to the viewer.
In the broadcast center, it can decode an incoming ED2 stream from the venue and send the PCM audio
through the facility for mixing in with studio shows and the playback of interstitials and commercials.
In the air chain, the LA-5291 can encode PCM coming through the plant to Dolby Digital Plus JOC or
transcode an incoming ED2 stream directly to Dolby Digital Plus JOC.
QUICK-START INSTALLATION GUIDE

HARDWARE
HARDWARE
LA-5291 Front Panel
Figure 1: Front panel
LA-5291 front panel features include:
•Reset button for restarting the unit from the front panel (1A)
•Four status LEDs indicating the status of each power supply (1B, 1C), the overall status of the unit
(1D), and sync for the reference clock (1E).
•A color LCD display to show status and basic configuration parameters (1F)
•A five-button navigation cluster with Left, Right, Up, and Down arrows plus a green “OK” button
(1G)
•A USB port used for software updates (1H)
The front panel is used for the initial setup and configuration including setting the IP address of the
Control Ethernet port. Additional configuration is accomplished via the remote user interface.

LA-5291 Rear Panel
Figure 2: Rear panel
The rear panel of the LA-5291 contains the following connections:
•Two RJ-45 Gigabit Ethernet connections, one for network remote control (2A) and one for AES67
I/O (2B)
•3Gb/s HD/SD-SDI input and output (2C) on female BNC connectors
•Quad-Link SDI or MADI I/O (2D) - optional
•Five AES-3 I/O connections (2E) on female BNC connectors
•Parallel GPI/O control port (female DB-15) for five inputs and five outputs (2F)
•Two IEC power inlets for the redundant internal universal auto-ranging power supplies (2G)
Note:
Although the hardware is present for two independent SDI I/O paths, only the first SDI I/O is
active at this time. The second path will be enabled in a future firmware update.
HARDWARE

Installation
LA-5291 is a 1RU product intended to be permanently installed in standard 19 ½” equipment rack and
secured with four standard rack screws. It is fan cooled with air intakes and exhausts located on the side
of the unit just behind the front panel, but whenever possible, it is recommended to leave 1RU of empty
space above and below the unit.
Power
Plug the supplied IEC power cords into the LA-5291 and connect each to different mains power sources.
Remember that while redundant supplies do protect against the unit losing power in the event of a PSU
failure, the loss of mains supply voltage is a bigger concern. Accordingly, each supply should be fed from a
different circuit equipped with adequate surge protection and fitted with an uninterruptable power supply
(UPS).
Boot Up and Home Screen
The unit will power up as soon as the power cords are connected, and using the Reset button is not
required on initial startup. The front panel of the unit will remain dark during most of the boot process but
the Status LED will light. Once the boot process is complete, the Home Screen will appear and the Status
LED will turn green.
Figure 3: Front panel home screen
INSTALLATION AND INITIAL SETUP

INSTALLATION AND INITIAL SETUP
Setting IP Addresses
LA-5291 ships with DHCP enabled and will automatically retrieve an IP address when connected to a
network with a DHCP server.
Important!
The Control and AES67 Ethernet connections both require 1000BASE-T (Gigabit) switch ports
in order to work properly.
If both the Control and AES67 ports will be used, they must be in different subnets. In-band
control is available using the AES67 port.
If only one port will be used, set the unused port to “Static IP” with an IP Address of 0.0.0.0, a
Subnet Mask of 0.0.0.1, and a Gateway of 0.0.0.0.
To set a fixed IP address for the Control port:
•Press the Right button once to show the Information screen and once more to navigate to the IP
Configuration (Control) screen
•Press the Down button to highlight “Edit”
•Press the OK button to highlight “Use DHCP”
•Press the Right button to highlight “Yes”
•Press the Up/Down buttons to select “No”
•Press the Left button to highlight “DHCP” again
•Press the Down button to highlight “Address”
•Press the Right button to move to the first digit of the IP address
•Use the Up/Down buttons to change the value
•Use the Right/Left buttons to select another digit to edit
•When finished editing the Address field, press the Right/Left buttons to highlight “Address” again
•Press the Down button to navigate to the “Netmask” field, following the instructions above for
entering the value
•When finished editing the Netmask field, press the Right/Left buttons to highlight “Netmask” again
•Press the Down button to navigate to the “Gateway” field, following the instructions above for
entering the value
•When finished editing the Gateway field, press the Right/Left buttons to highlight “Gateway” again
•Press the Down button to highlight “Update”
•Verify the information has been entered correctly and press the OK button to save the new values
•If you notice incorrect information and need to start over, use the Right button to highlight “Cancel”
followed by the OK button