Installation Guide

DAXI Operation
4035812 Rev B 5
DAXI Operation
The DAXI converts up to four auxiliary channels of analog video and audio content
to a single digital data stream for input to the DSAN via its Aux1 or Aux2 input port.
Both DSAN Aux ports can be active at the same time, allowing for connection of two
DAXI units to support up to eight auxiliary channels.
The DSAN recovers the individual content channels from the DAXI data stream and
assigns them to EIA channels in accordance with its current configuration.
Signal Processing
The DAXI accepts analog baseband audio and video signals, converts these signals
to digital form, and synchronizes the audio and video data from each channel. It
then compresses audio using AC-3 encoding and video using MPEG-2 encoding,
multiplexes the channels into an MPEG-2 transport stream, and sends this transport
stream to the DSAN over a DVB ASI link.
Status Reporting
The ASI stream that the DAXI sends to the DSAN includes telemetry for status
reporting. The DAXI reports its unit ID, video input states, and any alarms in a
status report to the host DSAN.
The DAXI operates in an allowable environment of 0 to 50°C (32 to 122°F). Control
circuitry inside the DAXI periodically reads the output of an on-board temperature
sensor and compares it to defined upper and lower thresholds. The DAXI sends an
alarm if the temperature is higher or lower than the threshold, or if it detects that
one or both internal fans is inoperative.