Manual

Model 48D User Guide Issue 2, July 2018
Studio Technologies, Inc. Page 7
support a sample rate of 96 kHz, while the
other devices connected to the network
only support 48 kHz. In this situation the
Model 48D would allow two channels
in each direction to interconnect, while
still maintaining the required 96 kHz and
48 kHz sample rates. In this application it’s
interesting to note that both of the Model
48D’s Ethernet ports would be connected
to the same local-area-network (LAN).
The Model 48D supports a maximum of
four audio channels in each direction which
can seem to be a significant limitation. But
this small channel count should prove very
adequate for many applications. For ex-
ample, live-event venues may only need
to interchange a few audio channels with
OTA (over-the-air) or web streaming mo-
bile broadcast facilities. The venue might
send one or two channels of scoreboard,
replay, or stadium announcer audio. While
the mobile facility may only need to return
program or “on-air” feeds to the “house”
audio console.
DDM and AES67
The Model 48D is compliant with the
Dante Domain Manager software applica-
tion. However, there is no requirement that
each of the two network interfaces be part
of a DDM domain. One of the Model 48D’s
network interface’s can utilize the security
resources of DDM while the other remains
“open.” Each of the Model 48D’s network
interface’s can be configured to support,
or not support, AES67 digital audio sig-
nals. This allows a Model 48D to serve in
a unique Dante-to-AES67 bridge function.
However, note that when AES67 support
is enabled for an interface the sample rate
will be fixed at 48 KHz.
Pro Audio Quality
The Model 48D’s audio circuitry was de-
signed to meet the demands of professional
audio applications. Audio data passing
between the two network interfaces remains
within the digital domain. To achieve audio
data synchronization between the two
networks high-performance sample-rate-
converter (SRC) integrated circuits are
utilized. This allows compatibility between
widely-divergent sample rates while main-
taining low-distortion, low-noise, and high
headroom.
Status LEDs and LCD Display
On the front panel the Model 48D provides
four LED indicators, a 2-line back-lit LCD
display, and five pushbutton switches. Two
of the LEDs indicate the status of the input
power sources. The other two LEDs are
associated with the two network interfaces.
The LCD display allows a number of oper-
ating conditions to be monitored, including
firmware version numbers, network param-
eters, and Dante operating characteristics.
The pushbutton switches can be used to
select which menu page is displayed as well
as allowing key network parameters to be
revised. These include the IP configuration
methods, IP addresses, and subnet mask
values. Six LEDs on the back panel indicate
the status of the two network connections
and associated Dante interfaces.
Ethernet Data and Power
Source
The Model 48D interconnects with two inde-
pendent local-area-networks (LANs) using
standard 100 Mb/s twisted-pair Ethernet
signals. The physical connections are made
by way of two Neutrik® etherCON RJ45
receptacles. While compatible with standard