Studio Technologies 5402 Manual de usuario
50703-0421, Issue Preliminary 1
Copyright © 2021 by Studio Technologies, Inc., all rights reserved
studio-tech.com
User Guide
Issue Preliminary 1, April 2021
This User Guide is applicable for serial numbers
M5402-00151 and later with Main MCU firmware 1.00 and later
Model 5402
Dante® Leader Clock
with GNSS Synchronization
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Model 5402 User Guide Issue Preliminary 1, April 2021
Studio Technologies, Inc. Page 3
Table of Contents
Revision History .................................................................................................................. 4
Introduction .......................................................................................................................... 5
Installation ........................................................................................................................... 9
Dante Configuration ............................................................................................................ 14
Model 5402 Configuration ................................................................................................... 17
Operation ............................................................................................................................. 36
Technical Notes ................................................................................................................... 48
Specifications ...................................................................................................................... 54
Appendix A–Sync Input Sources ......................................................................................... 56
Appendix B–Network Configuration Examples .................................................................... 57
Appendix C–Dante Controller Network Default Configuration Values ................................. 60
Appendix D–Menu Structure ............................................................................................... 61
Appendix E–Screen Captures ............................................................................................. 62
Appendix F–Model 5402’s Default Configuration Values .................................................... 67
Appendix G–PTPv2 (IEEE® 1588-2008) Default Characteristics ....................................... 68
Appendix H–Accessing the Unit when the User Name and/or Password is Not Known ..... 69
Issue Preliminary 1, April 2021 Model 5402 User Guide
Page 4 Studio Technologies, Inc.
Revision History
Issue Preliminary 1, April 2021:
• Initial preliminary release.
Model 5402 User Guide Issue Preliminary 1, April 2021
Studio Technologies, Inc. Page 5
Introduction
The Model 5402 Dante Leader Clock with
GNSS Synchronization provides precise
timing signals for applications that utilize the
Dante audio-over-IP (AoIP) media network-
ing technology. The unit implements a high-
performance IEEE® 1588 precision time
protocol (PTP) server, compatible with the
requirements of Dante and capable of simul-
taneously supporting the timing needs of up
to hundreds of Dante-compatible devices.
As expected, the Model 5402 provides the
PTPv1 (IEEE 1588-2002) compatibility that’s
required by Dante. In addition, the unit sup-
ports PTPv2 (IEEE 1588-2008) for AES67
applications. The unit includes an integrated
GNSS (satellite) receiver to allow a precise
timing reference to be acquired from the four
major constellations: GPS, Galileo, BeiDou,
and GLONASS. In additional, a sync input
connection allows the Model 5402’s internal
oscillator to be synchronized with a variety of
external timing and reference signals. A word
clock output provides a general-purpose tim-
ing reference for use by external devices.
The Model 5402 integrates with the Dante
Domain Manager™ (DDM) software appli-
cation. With DDM, support for ST 2110 and
AES67 can take place alongside Dante audio.
And with multiple Model 5402 units all utilizing
GNSS-based timing, studios across town or
even around the globe can share audio.
As an additional resource, the Model 5402
generates eight sine-wave audio tones on
Dante transmitter (output) channels. These
can be useful during audio and data network
installation, maintenance, and operation.
The Model 5402 is suitable for use in fixed
and mobile broadcast facilities, post-produc-
tion studios, commercial and educational
theater environments, and entertainment
applications. Only power, a GNSS antenna,
and one, two, or three Ethernet network con-
nections are required for full operation. Us-
ing Dante’s inherent capabilities two Model
5402 units can serve in primary and backup
Leader clock roles for redundant operation.
The unit’s three Gigabit Ethernet (GigE)
network interfaces can be configured for
use in a range of network implementations.
For high-reliability audio applications two of
the interfaces can support redundant Dante
operation while the third can be used for ac-
cessing the management webpages.
An integrated web server allows fast and
flexible monitoring and configuration of the
unit’s networking, clocking, and Dante per-
formance. Front-panel LED indicators, an
LCD display, and pushbutton switches pro-
vide users with direct access to key operat-
ing parameters.
The Model 5402 can be powered by 100-
240 V, 50/60 Hz mains or a source of
12 volts DC. Both can be simultaneously
Figure 1. Model 5402 Dante Leader Clock with GNSS Synchronization front and back views
Issue Preliminary 1, April 2021 Model 5402 User Guide
Page 6 Studio Technologies, Inc.
connected to provide redundant operation.
The lightweight enclosure mounts in one
space (1U) of a 19-inch equipment rack.
Industry-standard connectors are used for
Ethernet, GNSS antenna, DC power, and AC
mains interconnections. Updating the Model
5402’s operating software can be easily per-
formed using a USB flash drive.
Applications
Applications for the Model 5402 include
broadcast and post-production facilities,
college and university audio networks,
arenas, stadiums, corporate installations,
and virtually any application where substan-
tial numbers of Dante-compatible devices
are utilized. The Model 5402 will serve as a
stable and consistent Leader clock for the
entire Dante “network.” And, as expected,
the Model 5402 is compatible with all Dante
devices, no matter what their function or
whom their manufacturer. Applications
that utilize devices compatible with AES67
will also benefit from the Model 5402’s
resources. With its ability to “lock” to a
satellite-based time standard, multiple Model
5402 units can be deployed literally “around
the world” and maintain synchronized PTP
performance.
Why a Dedicated Dante Leader
Clock?
With Dante ubiquitous in fixed and mobile
facilities of all sizes and types, the need
arose for a cost-effective, purpose-designed,
dedicated Leader clock. While an inherent
strength of Dante networking is its carefully
implemented use of the IEEE 1588 stan-
dard to ensure that all connected devices
maintain a common timing reference, the
actual performance can vary widely de-
pending on the specific Dante devices in
use and the overall number of devices on a
network. There are many Dante-compatible
devices that can provide adequate basic
performance as a Leader clock, but with the
Model 5402 networked audio systems get
the benefits of a high-performance Primary
Leader Clock, along with additional unique
capabilities. The unit’s feature set, along
with the associated internal hardware and
software, was designed to provide optimum
performance, flexibility, and system integrity.
Timing Sources
The Model 5402 can provide excellent
Leader clock performance using a timing
reference that is based on signals provided
by one or more GNSS (satellite) constella-
tions. This will ensure accuracy and stabil-
ity that exceeds the capability of standard
Dante devices by at least an order of mag-
nitude. A configuration choice is provided in
a Model 5402 webpage to allow a failover
source of timing to be selected should a
valid GNSS signal become unavailable.
The Model 5402 will also provide strong
Leader clock performance using its temper-
ature-stabilized internal oscillator. While its
standalone performance is excellent, it can
also be “locked” to a variety of external sig-
nals for integration into facilities that already
include a central or main timing reference.
Compatible signals include word clock,
video reference, and 10 MHz. Word clock
is a square wave signal that is often used
as a timing reference in audio-only facilities.
Video reference (“sync”) signals are found
in most broadcast and post-production facili-
ties. The Model 5402 supports the most-
common video format/rate combinations
including “black burst,” bi- and tri-level HD,
and several that are specifically intended for
4K applications. Industrial and commercial
facilities often utilize a source of 10 MHz
sine-wave as a timing reference.
Model 5402 User Guide Issue Preliminary 1, April 2021
Studio Technologies, Inc. Page 7
GNSS Support
The Model 5402’s internal time base can
be synchronized to signals received from
satellite-based timing systems. Most often
referred to as “GPS,” satellite-based time
and position data is more properly identi-
fied as being received from a GNSS (Global
Navigation Satellite System). GPS (Global
Positioning System) is just one set of sat-
ellites that can provide GNSS data. For
maximum flexibility the Model 5402 contains
an integral receiver that is compatible with
the four major worldwide GNSS constella-
tions: GPS (USA), Galileo (Europe), BeiDou
(China), and GLONASS (Russia). In addi-
tion, the unit allows augmentation support
for GPS as provided by QZSS (Japan).
Configuration choices allow which constel-
lations will be utilized by the Model 5402.
This can range from one to all four constel-
lations. Using these capabilities, the Model
5402 can achieve single-digit nanosecond
timing accuracy. Multiple, geographically
disbursed sites (“network nodes”) can each
use a Model 5402 to easily achieve a coor-
dinated 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 manage-
ment 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 an-
tenna 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 using
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 provid-
ing 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 selected
to be 44.1, 48, 88.2, or 96 kHz. The under-
lying timing source for the word clock out-
put 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 pro-
cessed 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.
Figure 2. An active, multi-band, high-precision
antenna is included with each Model 5402
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Audio Reference Signals
The Model 5402 generates eight sine-wave
audio reference signals intended for general-
purpose use. These audio tones are pro-
vided by the Model 5402 in the form of Dante
transmitter (output) channels. They can be
connected, using the Dante Controller appli-
cation, to Dante receivers (inputs) on related
equipment. The flexibility of being able to
interconnect signals (create Dante “sub-
scriptions”) between all Dante devices on a
network allows the audio reference tones to
be used for a variety of purposes. Configura-
tion choices allow the frequency and level
of each sine-wave signal 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 common
timing reference. This is accomplished us-
ing 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. However, the
actual performance can vary widely depend-
ing 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 integrated
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 per-
form “double duty,” serving in both a primary
function (such as analog-to-Dante interfacing
or audio signal processing) as well as acting
as a Leader clock. This is understandable
as the main purpose of these devices is to
serve functions other than acting as a pri-
mary synchronization reference. Specialized
features, such as allowing a GNSS-derived
time base is rarely, if ever, supported. And
PTP performance can degrade when the
computing power of a device is intended pri-
marily for handling and manipulating digital
audio signals. This can lead to the required
PTP resources being in short supply when
the number of Dante devices that need
timing messages moves into the hundreds.
Also, firmware updates, cabling changes,
and other maintenance tasks typically asso-
ciated with a general-purpose Dante device
would impact the Leader clock functionality
for an entire installation.
The Model 5402 was specifically designed
to support a Dante-based audio or video
system’s Leader clock requirement. And by
utilizing GNSS, multiple Model 5402 units
can be installed at independent locations
while sharing a common timing reference.
The unit’s generation of audio tones and
implementation of the word clock output uti-
lize hardware circuitry that is separate from
that associated with its PTP functionality.
As such, this secondary functionality will not
interfere with PTP operation. Unlike general-
purpose Dante devices, once mounted in an
equipment rack and the required intercon-
nections made, the Model 5402 will perform
its tasks without risk of interruption due to
conflicting resource demands.
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Studio Technologies, Inc. Page 9
Flexible Networking Capability
Using the Dante Controller application
program, the Model 5402’s three Ether-
net ports can be selected to operate in
one of four modes: Switched, Redundant,
Switched+Mgmt, and Redundant+Mgmt.
This should allow virtually any desired
networking implementation to be easily
achieved.
By using the Switched or Redundant net-
work modes, separate network connections
will be maintained for Dante audio and man-
agement purposes.
In the Switched mode a single Ethernet
connection to either of the Model 5402’s
two Dante Ethernet ports will provide Dante
Leader clock functionality. The remaining
Dante Ethernet port will provide Dante net-
work “loop-through” capability and can be
used to interface with another piece of Eth-
ernet-connected equipment. The manage-
ment Ethernet port will be used to access
the Model 5402’s monitoring and configura-
tion webpages.
In the Redundant mode two independent
Ethernet connections are made to the
Model 5402’s two Dante Ethernet ports,
enabling Dante’s redundant networking
capability. Again, the management Ethernet
port will be used to access the Model 5402’s
monitoring and configuration webpages.
In the Switched+Mgmt mode a single Ether-
net connection is used for both Dante Lead-
er clock functionality as well as providing
access to the Model 5402’s management
webpages. The remaining Dante Ethernet
port will provide network “loop-through”
capability and can be used to interface
with another piece of Ethernet-connected
equipment.
In the Redundant+Mgmt mode two indepen-
dent Ethernet connections can be made to
the Model 5402’s two Dante Ethernet ports.
This will enable Leader clock capability for
redundant Dante applications. Access to the
Model 5402’s management webpages will
be made by way of the Ethernet connection
made to the Dante primary Ethernet port.
Operating Power
The Model 5402 allows an AC mains source
of 100-240 V, 50/60 Hz to be directly con-
nected. It can also be DC powered using
a 10-18 volt source that is connected via a
broadcast-standard 4-pin XLR connector.
If both AC and DC power sources are con-
nected the unit will be powered by the AC
mains supply. Only if the AC mains source
fails will appreciable power be drawn from
the DC source. This allows a source of DC,
typically an external power supply, to serve
in a backup capacity. With this arrangement
normal operation can continue even if AC
mains power is lost.
Future Capabilities
The Model 5402 was designed so that its
capabilities can be enhanced in the future.
A USB connector, located on the unit’s back
panel, allows the three firmware files (em-
bedded software) to be updated using a
USB flash drive. The Model 5402’s Dante
firmware can be updated using one of the
unit’s Ethernet connections, helping to en-
sure that the Dante capabilities remain up to
date. All software files and configuration pa-
rameters are stored in non-volatile memory.
Installation
In this section the Model 5402 will be
mounted in one space (1U) of an equipment
rack. In most cases, a GNSS (satellite)
antenna will be connected. It’s also possible
Issue Preliminary 1, April 2021 Model 5402 User Guide
Page 10 Studio Technologies, Inc.
that an external synchronization source will
be connected. A connection may be made to
the word clock output. One or more Ethernet
data connections will be made. AC mains
and/or DC power will be connected to the
Model 5402.
The interface cable associated with the
included GNSS antenna will be connected to
the SMA jack on the back panel of the Model
5402. Using a coaxial cable terminated with
a BNC plug, an external source of synchro-
nization may be connected to the sync input.
A word clock output is provided by way of a
BNC jack and may be utilized by one or more
pieces of equipment. Up to three Ethernet
data connections will be made to the Model
5402 using standard RJ45 patch cables.
AC mains power can be connected to the
Model 5402 by means of a detachable cord
that is compatible with the unit’s 3-pin IEC
320 C14 inlet connector. Some applications
may warrant connection to a source of nomi-
nal 12 volts DC which can be made by way
of a 4-pin XLR connector. A DC source can
be used to power the Model 5402 as well as
serving as a backup power source should AC
mains not be present.
What’s Included
The shipping carton contains a Model 5402
Dante Leader Clock, a GNSS antenna, and
instructions on how to obtain an electronic
copy of this guide. Also included in the ship-
ping carton is a North-American-standard
AC mains cord. For destinations outside of
North America the local reseller or distribu-
tor should provide an appropriate AC mains
cord.
Mounting the Model 5402
The Model 5402 Dante Leader Clock re-
quires one space (1U) in a standard 19-inch
(48.3 cm) equipment rack. Secure the unit
into the designated equipment rack using
two mounting screws per side. As the Model
5402 does not contain a fan or other noise-
producing source it can be located within
a room or other structure where audio moni-
toring is going to take place. But the priority
when selecting a location is to ensure that
the cable associated with the GNSS an-
tenna can reach the SMA jack on the Model
5402’s back panel. In addition, some or all
of the connections involving the sync input
jack, the word clock output jack, the Ether-
net interface RJ45 jacks, and the AC mains
and/or DC power connectors may be utilized.
The included GNSS antenna has an integral
5-meter (16.3 foot) nominal cable terminated
with an SMA plug. It’s possible that an
extension cable or alternate antenna will
be utilized which could expand the mount-
ing location choices. Twisted-pair (UTC)
Ethernet has a 100-meter (325-foot) inter-
connection cable limitation. But that can be
overcome by using fiber-optic interconnec-
tions between the Model 5402 and the Eth-
ernet switch or switches in the one or more
associated local-area-networks (LANs).
Connecting the GNSS Antenna
A multiband GNSS antenna is included with
each Model 5402. This is not just a common
low-cost single-band generic “GPS” antenna.
This antenna, Studio Technologies’ order
code ANT-GNSS-01, is a premium-quality
device that will support reception of all the
satellite constellations that can be received
by the Model 5402. The antenna must be
located where an unobstructed “view” of
the sky is available. The top of the antenna
should face up so as to be within line-of-sight
of overhead satellites. In most cases, an out-
door location will be optimal but selecting an
indoor location that has minimal RF blockage
can also be effectively used. The antenna
is suitable for outdoor use and has an IP67
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