Studio Technologies 5120 2011 - Manual (Page 8)

Issue 3, November 2011 Model 5120 User Guide
Page 8 Studio Technologies, Inc.
Model 5120
Line/IFB Output Module
Digital Audio Input
The Model 5120’s two audio input chan-
nels can be supplied in the form of a 75
ohm unbalanced digital signal that is
compatible with AES3id (technically the
“id” suffix is no longer part of the AES stan-
dard). The physical connection is made by
way of a DIN 1.0/2.3-compliant receptacle.
This receptacle is located adjacent to the
analog audio input connector. This type of
signal and connector is commonly used in
broadcast and related applications. It was
specifically selected for the Model 5120
because of its small size.
The digital audio input signal is intended to
have a sample rate of 48 k/sec, although
the less-common 32 k/sec and 44.1 k/sec
are also compatible. The recommended
nominal level of the connected digital
audio source will depend on the specific
Model 5120 version being installed. For
Model 5120S (SMPTE) version modules
the nominal level should be –20 dBFS. For
Model 5120E (EBU) version modules the
nominal level should be –18 dBFS.
DC Power
A 4-position header, located adjacent to
the analog audio input connector, is used
to connect DC power to the Model 5120.
A source of nominal 12 volts DC, with an
acceptable range of 10 to 18, is required
for Model 5120 operation. The maximum
current is 600 milliamperes at 12 volts DC.
Only pins 1 and 2 of the connector are
used to connect to DC power; pins 3 and 4
should remain unconnected.
The mating connector is, like the analog
audio inputs, compatible with the AMP
MTA series of IDC receptacles. For 22
AWG wire the receptacle would be AMP
part number 3-644540-4 with a body color
of red. For 24 AWG the AMP part number
is 3-643814-4 and the color is white. Refer
to Figure 3 for details.
DC Power Input
1. – DC (Common)
2. +DC (10-18 volts)
3. No connection
4. No connection
Figure 3. DC Power input interface connector
Mounting
The Model 5120 is intended for mounting
into an installation-specific enclosure or
rack panel. Refer to Appendix A for the
required mounting opening and screw
locations. Please contact the factory to
discuss mounting options.
Configuration
One configuration step must be performed
to ensure that the desired audio input
source is selected. One DIP switch is used
to select which audio source, analog or
digital, is to be used by the Model 5120.
Refer to Figure 4 for details.
Figure 4. Model 5120 audio source selection
DIP Switch 1
Off
 Digital Input
On  Analog Input
( 0 ) OFF
( 1 ) ON
Switches 2 through 4 not used.