Manual
Table Of Contents
Issue 3, August 2018 Model 44D User Guide
Page 18 Studio Technologies, Inc.
Upon Model 44D power up the status LEDs
will light in various manners. The PoE,
Dante, and Ethernet status LEDs, located
on the back panel, will light in various
ways. On the front panel the input power,
GPO status, and audio level meter LEDs
will light in a sequence. Once the test se-
quence has completed the two columns of
level meter LEDs associated with the line
outputs will momentarily display the ver-
sion number of the unit’s application firm-
ware (embedded software). Details on how
to “read” the version number are provided
in the Technical Notes section of this guide.
The Model 44D will now begin normal
operation. The way in which the back-panel
LINK/ACT, SYS, SYNC, and PoE LEDs light
will depend on the characteristics of the
connected Ethernet signal and the configu-
ration of the unit’s Dante interface. Details
will be covered in the next paragraph. The
user is presented on the front panel with
two input power status LEDs, two GPO sta-
tus LEDs, and four 5-segment LED audio
level meters. These resources are simple
to understand and should prove to be use-
ful as will be highlighted in the following
paragraphs.
Ethernet, PoE, and Dante
Status LEDs
Four status LEDs are located below the
etherCON connector on the Model 44D’s
back panel. The LINK/ACT LED will light
green whenever an active data connec-
tion to a 100 Mb/s Ethernet network has
been established. It will flash on and off
in response to data packet activity. The
PoE LED will light green whenever Power-
over-Ethernet (PoE) associated with the
connected Ethernet signal is providing
operating power for the Model 44D. The
SYS and SYNC LEDs display the operating
status of the Dante interface and associ-
ated audio-over-Ethernet network. The SYS
LED will light red upon Model 44D power
up to indicate that the Dante interface is not
ready. After a short interval it will light green
to indicate that it is ready to pass audio
data with another Dante device. The SYNC
LED will light red when the Model 44D is
not synchronized with a Dante network. It
will light solid green when the Model 44D
is fully synchronized with a Dante network
and an external clock source (timing refer-
ence) is being received. It will slowly flash
green if this specific Model 44D is serving
as the clock master for the Dante network.
How to Identify a Specific
Model 44D
The Dante Controller software application
offers an identify command that can be
used to help locate a specific Model 44D.
When identify is selected for a specific unit
its audio level meter LEDs will light in a
unique pattern. In addition, the SYS and
SYNC LEDs, located directly below the
etherCON connector on the back panel,
will slowly flash green. After a few seconds
the LED identification patterns will cease
and normal Model 44D level meter and
Dante status LED operation will again take
place. Audio performance will not be im-
pacted by the use of the identify command.
As such it’s perfectly acceptable to use
the identify command any time it would be
useful.
Line Inputs
The Model 44D’s two line inputs are elec-
tronically balanced (differential), capacitor
coupled, with a nominal impedance of 20 k
ohms. The nominal analog level of signals