Studio Technologies 5154 - Manual (Page 11)

Model 5154 User Guide Issue 3, September 2013
Studio Technologies, Inc. Page 11
Model 5154
Video Generator/Audio De-Embedder Module
Technologies should support for multi-mode
fiber be required.
The Model 5154 module should remain
without power whenever its optical output
has not been terminated. This ensures that
the optical energy will not project into free
space and possibly into the eyes of instal-
lation personnel. The optical output power
of video SFP modules selected by Studio
Technologies adheres to the class 1 laser
standard. As such, they do not emit suf-
ficient power to be considered hazardous.
But best safety practices require that the
optical output port and all unconnected
fiber ends not be directly viewed.
No configuration setting is required to
activate the optical output. It is always
active and will contain the same SDI data
as that found on the coaxial (BNC) output.
As such there is no problem in simultane-
ously connecting to both the optical and
coaxial (BNC) outputs.
Optical SDI Input
If supported by the specific Model 5154
module being installed, an HD- or 3G-SDI
signal transported on a single-mode optical
fiber can be connected. For an input to be
present a video SFP transceiver or a re-
ceive-only SFP module must have been in-
stalled in the SFP “cage” in the back of the
unit. The optical receiver circuitry in an SFP
module is “broadband” and doesn’t need
to receive a specific wavelength of single-
mode optical signal for correct operation.
As long as the optical signal has a wave-
length between 1250 and 1650 nanometers
and meets the applicable SMPTE stan-
dards it will be recognized correctly.
A single-mode optical fiber terminated with
an LC plug can be connected to the receive
port on the SFP module. This port is on the
right side when looking directly at the back
of the SFP module. Typically there will be
a graphic arrow icon pointing “in” on the
top of the module. Refer to Figure 2 for
details on the location of the SFP module.
Ensure that the LC plug fully “mates” with
the receive port and its tab is locked into
the slot of the SFP module.
A configuration setting must be appropri-
ately made to enable the optical SDI input.
There is no automatic switching between
the optical and coaxial (BNC) SDI inputs.
Only one of the two SDI inputs can be
selected and active at a time. Refer to
the Configuration section of this guide
for details.
Digital Audio Outputs
Four unbalanced digital audio outputs are
supplied by the Model 5154. Following
SMPTE standards, their audio data will be
derived by de-embedding audio group data
from the SDI input signal. The four digital
audio outputs represent eight audio chan-
nels, two per digital audio signal. The four
outputs comply with the AES3 standard
for unbalanced serial digital audio signals.
They have a characteristic impedance of
75 ohms and a nominal signal level of 1
volt peak-to-peak. This type of signal was
previously referred to as being an AES3id
digital audio signal.
The sample rate of the digital audio out-
puts is 48 kHz with a bit depth of 24. The
signals are essentially asynchronous, their
timing being based on the internal time-
base of the Model 5154. There is no provi-
sion to “lock” the four digital audio outputs
to an externally-connected timing refer-
ence source. It’s expected that the audio
data in the AES3 signals will follow either
the AES (–20 dBFS) or EBU (–18 dBFS)