Studio Technologies 5121 - Manual (Page 7)

Model 5121 User Guide Issue 3, October 2014
Studio Technologies, Inc. Page 7
Model 5121
Line/IFB Output Module
The Model 5121 requires an external source
of nominal 12 volts DC for operation. The
acceptable input voltage range is 10 to 18
allowing a variety of power sources to be uti-
lized. Power supply circuitry within the Model
5121 creates the voltages required for the
analog audio, digital audio, and IFB circuitry.
The Model 5121 uses standard connectors
for fast, convenient interconnection. Line-
level and IFB output connections are made
using 3-pin male XLR connectors. The two
analog audio inputs use a 5-position, 0.1-
inch “header” connector. A DIN 1.0/2.3 co-
axial connector is used to interface an AES3
unbalanced digital audio source. The DC
power input and data bus connections use
a 4-position, 0.1-inch header. Low-cost IDC
(insulation displacement) mating connectors
allow simple interconnection with the analog
audio inputs and DC/data signals.
For compliance with international broadcast
audio level standards two versions of the
Model 5121 are available. The Model 5121S
supports SMPTE® audio levels where the
analog audio reference level is +4 dBu and
the digital audio reference level is –20 dBFS
(SMPTE RP155). The Model 5121E sup-
ports applications that require European
Broadcast Union (EBU) compliance with an
analog audio reference level of 0 dBu and
a digital audio reference level of –18 dBFS
(EBU R68).
The Model 5121 is compatible with the Stu-
dio Technologies’ Model 5190 Remote Ac-
cess Module. This will allow monitoring and
control, via an Ethernet connection, of sever-
al module operating and status parameters.
A local RS-485 data bus allows up to 16 of
the 5100-Series modules to be connected
to a Model 5190. The status of the IFB DC
output as well as the version number of the
unit’s firmware can be observed. The audio
input source mode can be selected, with the
choices being automatic, digital, or analog.
In the automatic mode the digital input will
have priority over the analog input. The gain
of the input section can be adjusted with the
supported range of ±12 dB in 3 dB steps.
Installation
Integration of the Model 5121 into the
selected application is quite simple, only
requiring connecting either or both ana-
log and digital audio input sources along
with DC power. Some applications will also
require connection to the RS-485 data bus.
The analog audio sources should have a
nominal level of either +4 or 0 dBu, depend-
ing on the Model 5121 version being in-
stalled. The DC power source is nominal 12
volts with an acceptable range of 10 to 18
volts. The RS-485 data bus is a single pair
of wires that would interconnect the Model
5121, along with other Model 5100-Series
modules, to a Model 5190 Remote Access
Module. After the connections have been
completed, the module can then be secured
into the designated mounting location.
Analog Audio Inputs
The Model 5121 allows two channels of
analog line-level audio to be connected. The
input circuitry is electronically balanced and
capacitor coupled. The nominal input level
of Model 5121S (SMPTE) version modules
is +4 dBu with a maximum allowable input
level of +24 dBu. The nominal input level
of Model 5121E (EBU) version modules is
0 dBu with a maximum allowable level of
+18 dBu.
Connections to the audio inputs are made
using a 5-position header connector located
on the Model 5121’s rear-most circuit board.