14
Sage Digital ENDEC Manual Rev 2.0
11. Powering Up the ENDEC
When you power up the ENDEC:
• The red LED labeled Automatic on the front panel flashes. This indicates that at least one error
message is in the message buffer. The error message for first time power up is “Local Area not
defined”. To define a local area, use the Local Area tab in ENDECSetD.
• The ENDEC performs a self-test. If there are any errors, the Incoming Alert LED will blink. Use
the MSG soft key to read the errors (scroll the messages with the up and down keys).
12. ENDEC Audio
12.1 Analog Audio
The Mon1 through 6 inputs are used to send audio alerts to the ENDEC. These are typically connected to
radio receivers, although they will sometimes be TV or Cable receivers, satellite audio channels, or any
other analog source. The Mon in and Enc in inputs are limited to 2Vrms. Exceeding the 2Vrms level
will result in poor audio, exceeding 4Vrms will damage the ENDEC.
The front panel microphone input level can be as low as 16mv for high settings of
MENU.LEVEL.MIC or as
high as 170mv for low settings of
MENU.LEVEL.MIC. See Public Safety: Connecting a Microphone on page
22
for a description of the connector.
12.2 Digital Audio
12.2.1 Digital Audio Input, Output, and Pass-through
The Digital ENDEC has a single AES/EBU in and out. The input is used to accept station audio. The
ENDEC can be configured to actively or passively copy this data to the output. The ENDEC will also send
an alert to the output. The output clock can be generated internally, or derived from the input data stream.
The ENDEC always sends the alert in two channel format.
Use the
MENU.DIGITAL front panel or ENDECSetD Digital Audio tab to control how and if the ENDEC
performs digital audio pass-through. Following are descriptions of how the various settings can be used to
implement several pass-through types.
1) Active Digital Pass-through. In this mode, the ENDEC acts as an audio switch. The station audio is
connected to ENDEC Digital Audio In, and the ENDEC copies the bit stream to Digital Audio Out.
When an alert is sent, the station audio is replaced by the alert audio on a bit boundary, causing a
minimal frame sync loss. The ENDEC’s mechanical relay is ON all the time, meaning when the
ENDEC is powered, it is performing the active copy function, but as a failsafe, the ENDEC is a
hardwire pass-through when power is removed.
Settings:
Enable Digital Audio: Yes
Pass Through: Yes
Relay always on: Yes
Clock: External
2) Mechanically switched pass-through. In this mode, the ENDEC's mechanical relay is OFF (hardwire
pass-through) unless an alert is being sent. This causes a larger break in the digital audio stream at
the start and the end of an alert. This can cause an audio glitch in the output, but the ENDEC is not
inline unless an alert is in progress.
Settings:
Enable Digital Audio: Yes
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