Datasheet

second timing accuracy. Multiple, geographically disbursed
sites (“network nodes”) can each use a Model 5402 to easily
achieve a coordinated timing reference.
For general-purpose use the Model 5402’s GNSS receiver
will also report, by way of the front-panel display and/or the
management webpages, the current date and time of day, as
well as longitude and latitude parameters. In addition, the
number of satellites currently “fixed” (locked) and the receiver
input power can also be observed.
An active, multi-band, high-precision antenna is included with
each Model 5402. The compact antenna is weather-resistant
and includes a 5-meter (16.3 foot) cable with attached SMA
plug. The antenna can be secured to the selected location us
-
ing two machine screws or affixed magnetically to a metallic
surface. Its performance is very good and many applications
will find this antenna to be sufficient. But it’s expected that
alternate, installer-provided antennas may also be utilized
to meet the specific needs of various applications. This may
involve supporting longer interface cables, using different
mounting methods, or providing more-advanced weather-
resistant properties.
Word Clock Output
The Model 5402 generates a precise word clock output signal
that can be used as a timing reference for related equipment.
It’s specifically intended for “locking” digital audio devices
in applications that use the Model 5402 to provide timing
reference signals for the associated Dante equipment. In
this way, all devices in an installation will share a common
timing reference.
The word clock output rate can be 44.1, 48, 88.2, 96, 176.4,
or 192 kHz. The underlying timing source for the word
clock output is derived from the Model 5402’s main timing
source. This will typically be one or more of the supported
GNSS constellations. The main timing source is divided and
processed by the Model 5402’s logic circuitry to create the
highly stable word clock output. This ensures that the word
clock output is synchronized with the unit’s PTPv1 and PTPv2
server functionality.
Audio Tone Generator
The Model 5402 generates eight sine wave audio tones
intended for general-purpose use. These audio tones are
provided by the Model 5402 in the form of Dante transmitter
(output) channels. They can be connected, using the Dante
Controller application, to Dante receivers (inputs) on related
Studio Technologies, Inc. Model 5402 Dante Leader Clock with GNSS Synchronization, Issue 5, Page 3
equipment. The flexibility of being able to interconnect signals
(create Dante “subscriptions”) between all Dante devices
on a network allows the audio tones to be used for a variety
of purposes. Configuration choices allow the frequency and
level of each sine wave tone to be optimized for use in specific
applications.
Leader Clock Support for Dante
Networks
A core part of the technology underlying Dante audio-over-IP
networking ensures that all connected devices follow a com
-
mon timing reference. This is accomplished using the IEEE
1588-2002 (PTPv1) and 1588-2008 (PTPv2) precision time
protocols. Any connected Dante device can be used as a
Leader clock; there is no requirement that a dedicated Leader
clock device be utilized to realize adequate functionality. How
-
ever, the actual performance can vary widely depending on
the specific Dante devices available and the overall number
of Dante devices on a network.
Many Dante devices utilize the 2- or 4-channel Ultimo™ ULT
or UXT integrated circuits to implement Dante connectivity.
While Ultimo devices will fully support Dante audio transport,
they are not well suited to serve as a Leader clock. Ultimo’s
PTP performance is limited and does not have the ability to
synchronize with an external timing reference. Other Dante
devices may use the Brooklyn II module or Broadway inte
-
grated circuit to support Dante connectivity. In some cases,
these devices can provide good basic performance as a
Leader clock.
However, problems and limitations may arise when these
devices are called upon to perform “double duty,” serving in
both a primary function (such as analog-to-Dante interfac
-
ing or audio signal processing) as well as acting as a Leader
An active, multi-band, high-precision antenna is included with
each Model 5402