Sonifex AVN-GMC User manual

AVN-GMC
IEEE1588 PTP Grandmaster Clock
with GPS Receiver
HANDBOOK
Manufacturers of Audio Products for AV,
Installed Sound, Broadcast Radio & Broadcast TV

AVN-GMC Handbook
This handbook is for use with the following product:
IEEE1588 PTP Grandmaster Clock with GPS Receiver
AW10735, Stock Code: 30-294
Revision 1.12, February 2020
©Sonifex Ltd, 2020
All Rights Reserved
Sonifex Ltd, 61, Station Road, Irthlingborough,
Northants, NN9 5QE, England.
Tel: [phone]
Fax: [phone]
Email: [email protected]o.uk
Website: https://www.sonifex.co.uk
Information in this document is subject to change without notice and does not represent a
commitment on the part of the vendor. Sonifex Ltd shall not be liable for any loss or damage
whatsoever arising from the use of information or any error contained in this manual.
No part of this manual may be reproduced or transmitted in any form or by any means, electronic
or mechanical, including photocopying, recording, information storage and retrieval systems, for any
purpose other than the purchaser’s personal use, without the express written permission of Sonifex
Ltd. Unless otherwise noted, all names of companies, products and persons contained herein are
part of a completely fictitious adaptation and are designed solely to document the use of Sonifex
product.
Made in the UK by
For the latest Sonifex handbook information please visit the
Sonifex website at www.sonifex.co.uk

Contents & Figures
Contents
Product Warranty - 2 Year Extended i
Sonifex Warranty & Liability Terms & Conditions i
1. Definitions i
2. Warranty i
Unpacking Your Product ii
Repairs & Returns iii
Conformity iii
Safety & Installation of Mains Operated Equipment iii
Voltage Setting Checks iii
Fuse Rating iii
Power Cable & Connection iii
WEEE Directive iv
Atmosphere/Environment iv
1. AVN-GMC IEEE1588 PTP Grandmaster Clock with
GPS Receiver 1
Introduction 1
Front Panel Display & Indicators 2
Front Panel Indicators 2
Display & Spinwheel 3
Power Button 3
GPS Operation 3
Rear Panel Connectors 4
Front Panel Menu Navigation 5
AVN-GMC Menu Tree 6
2. Webserver & Unit Discovery 8
Bonjour Network Discovery 8
Standard Webpage Layout 9
Status Page 10
Status Indication 10
Device Status 11
Webpage Parameter Details - Device Information 12
Device Information 12
Network Information 12
GPS Satellite Information 12
Network Settings 13
Network Settings 13
PTP Profiles 14
PTP Profiles 14
Device Settings 16
Device Settings 16
Time Settings 17
Time Settings 17
Misc Settings 18
Misc Settings 18
Auto Save on Page Exit 18
Factory Defaults 18
System 19
Update Firmware 19
3. Grandmaster Clocks, AVN, RAVENNA & AES67 20
4. Technical Specification For AVN-GMC 21
Figures
Fig 1-1: The AVN-GMC Front Panel 1
Fig 1-2: Front Panel Indicators 2
Fig 1-3: Display & Spinwheel 3
Fig 1-4: Default Screen Display 3
Fig 1-5: AVN-GMC Rear Panel 4
Fig 1-6: AVN-GMC Menu Tree (V2.0) 7
Fig 2-1: Standard Webpage Layout 9
Fig 2-2: AVN-GMC Status Screen 10
Fig 2-3: AVN-GMC Device Information Screen 12
Fig 2-4: AVN-GMC Network Settings Screen 13
Fig 2-5: AVN-GMC PTP Profile Screen 14
Fig 2-6: AVN-GMC Device Settings Screen 16
Fig 2-7: AVN-GMC Time Settings Screen 17
Fig 2-8: AVN-GMC Misc Settings Screen 18
Fig 2-9: AVN-GMC System Screen 19

Warranty Registration
Sonifex Limited 61 Station Road Irthlingborough Northamptonshire NN9 5QE United Kingdom
Tel: [phone] Fax: [phone] Email: [e-mail] Internet: www.sonifex.co.uk
Register Online for an
Extended 2 Year Warranty
As standard, Sonifex products are
supplied with a 1 year back to base
warranty.
If you register the product online, you
can increase your product warranty
to 2 years and we can also keep
you informed of any product design
improvements or modifications.
To register your product, please go online to www.sonifex.co.uk/register
Product:
Serial No:

i
Warranty
Product Warranty - 2 Year Extended
As standard, Sonifex products are supplied with a 1 year back to base
warranty. In order to register the date of purchase and so that we can keep
you informed of any product design improvements or modifications, it is
important to complete the warranty registration online. Additionally, if you
register the product on the Sonifex website, you can increase your product
warranty to 2 years. Go to the Sonifex website at: www.sonifex.co.uk/
register to apply for your 2 year warranty.
Note: For your own records the product serial number is recorded on the
CE certification page of this handbook.
Sonifex Warranty & Liability Terms & Conditions
1. Definitions
‘the Company’ means Sonifex Ltd and where relevant includes companies
within the same group of companies as Sonifex Limited.
‘the Goods’ means the goods or any part thereof supplied by the Company
and where relevant includes: work carried out by the Company on items
supplied by the Purchaser; services supplied by the Company; and software
supplied by the Company.
‘the Purchaser’ means the person or organisation who buys or has agreed
to buy the Goods.
‘the Price’ means the Price of the Goods and any other charges incurred by
the Company in the supply of the Goods.
‘the Warranty Term’ is the length of the product warranty which is usually
12 months from the date of despatch; except when the product has been
registered at the Sonifex website when the Warranty Term is 24 months
from the date of despatch.
‘the Contract’ means the quotation, these Conditions of Sale and any
other document incorporated in a contract between the Company and the
Purchaser.
This is the entire Contract between the parties relating to the subject
matter hereof and may not be changed or terminated except in writing in
accordance with the provisions of this Contract. A reference to the consent,
acknowledgement, authority or agreement of the Company means in
writing and only by a director of the Company.
2. Warranty
a. The Company agrees to repair or (at its discretion) replace Goods
which are found to be defective (fair wear and tear excepted) and
which are returned to the Company within the Warranty Term
provided that each of the following are satisfied:
i. notification of any defect is given to the Company immediately
upon its becoming apparent to the Purchaser;
ii. the Goods have only been operated under normal operating
conditions and have only been subject to normal use (and
in particular the Goods must have been correctly connected
and must not have been subject to high voltage or to ionising
radiation and must not have been used contrary to the
Company’s technical recommendations);
iii. the Goods are returned to the Company’s premises at the
Purchaser’s expense;
iv. any Goods or parts of Goods replaced shall become the
property of the Company;
v. no work whatsoever (other than normal and proper
maintenance) has been carried out to the Goods or any part of
the Goods without the Company’s prior written consent;

ii
Warranty
vi. the defect has not arisen from a design made, furnished or
specified by the Purchaser;
vii. the Goods have been assembled or incorporated into other
goods only in accordance with any instructions issued by the
Company;
viii. the defect has not arisen from a design modified by the
Purchaser;
ix. the defect has not arisen from an item manufactured by a person
other than the Company. In respect of any item manufactured
by a person other than the Company, the Purchaser shall only be
entitled to the benefit of any warranty or guarantee provided by
such manufacturer to the Company.
b. In respect of computer software supplied by the Company the
Company does not warrant that the use of the software will be
uninterrupted or error free.
c. The Company accepts liability:
(i) for death or personal injury to the extent that it results from the
negligence of the Company, its employees (whilst in the course
of their employment) or its agents (in the course of the agency);
(ii) for any breach by the Company of any statutory undertaking as
to title, quiet possession and freedom from encumbrance.
d. Subject to conditions (a) and (c) from the time of despatch of
the Goods from the Company’s premises the Purchaser shall be
responsible for any defect in the Goods or loss, damage, nuisance
or interference whatsoever consequential economic or otherwise or
wastage of material resulting from or caused by or to the Goods. In
particular the Company shall not be liable for any loss of profits or
other economic losses. The Company accordingly excludes all liability
for the same.
e. At the request and expense of the Purchaser the Company will test
the Goods to ascertain performance levels and provide a report of
the results of that test. The report will be accurate at the time of the
test, to the best of the belief and knowledge of the Company, and the
Company accepts no liability in respect of its accuracy beyond that
set out in Condition (a).
f. Subject to Condition (e) no representation, condition, warranty or
other term, express or implied (by statute or otherwise) is given by
the Company that the Goods are of any particular quality or standard
or will enable the Purchaser to attain any particular performance
or result, or will be suitable for any particular purpose or use
under specific conditions or will provide any particular capacity,
notwithstanding that the requirement for such performance, result or
capacity or that such particular purpose or conditions may have been
known (or ought to have been known) to the Company, its employees
or agents.
g. (i) To the extent that the Company is held legally liable to the
Purchaser for any single breach of contract, tort, representation
or other act or default, the Company’s liability for the same
shall not exceed the price of the Goods.
(ii) The restriction of liability in Condition (g)(i) shall not apply to
any liability accepted by the Seller in Condition (c).
h. Where the Goods are sold under a consumer transaction (as defined
by the Consumer Transactions (Restrictions on Statements) Order
1976) the statutory rights of the Purchaser are not affected by these
Conditions of Sale.
Unpacking Your Product
Each product is shipped in protective packaging and should be inspected
for damage before use. If there is any transit damage take pictures of the
product packaging and notify the carrier immediately with all the relevant

iii
CE Conformity
details of the shipment. Packing materials should be kept for inspection and
also for if the product needs to be returned.
The product is shipped with the following equipment so please check to
ensure that you have all of the items below. If anything is missing, please
contact the supplier of your equipment immediately.
Item Quantity
Product unit 1
IEC mains lead fitted with moulded mains plug 1
Handbook and warranty card 1
If you require a different power lead, please let us know when ordering the
product.
Repairs & Returns
Please contact Sonifex or your supplier if you have any problems with your
Sonifex product. Email [e-mail] for the repair/
upgrade/returns procedure, or for support & questions regarding the
product operation.
Conformity
The products in this manual comply with the essential requirements of the
relevant European health, safety and environmental protection legislation.
The technical justification file for this product is available at Sonifex Ltd.
The declaration of conformity can be found at:
https://www.sonifex.co.uk/declarations
Safety & Installation of Mains
Operated Equipment
There are no user serviceable parts inside the equipment. If you should
ever need to look inside the unit, always disconnect the mains supply
before removing the equipment covers. The cover is connected to earth
by means of the fixing screws. It is essential to maintain this earth/
ground connection to ensure a safe operating environment and provide
electromagnetic shielding.
Voltage Setting Checks
Ensure that the machine operating voltage is correct for your mains power
supply by checking the box in which your product was supplied. The voltage
is shown on the box label. The available voltage settings are 115V, or 230V.
Please note that all products are either switchable between 115V and 230V,
or have a universal power supply.
Fuse Rating
The product is supplied with a single fuse in the live conducting path of the
mains power input. For reasons of safety it is important that the correct
rating and type of fuse is used. Incorrectly rated fuses could present a
possible fire hazard, under equipment fault conditions. The active fuse is
fitted on the outside rear panel of the unit.
Power Cable & Connection
An IEC power connector is supplied with the product which has a moulded
plug attached.
The mains plug or IEC power connector is used as the disconnect device.
The mains plug and IEC power connector shall remain readily operable to
disconnect the apparatus in case of a fault or emergency.
The mains lead is automatically configured for the country that the product
is being sent to, from one of:

iv
Safety & Installation
Territory Voltage IEC Lead Type Image
UK & Middle East 230V UK 3 pin to IEC lead
Europe 230V European Schuko round 2 pin to
IEC lead
USA, Canada and
South America 115V 3 flat pin to IEC lead
Australia & New
Zealand 230V Australasian 3 flat pin to IEC lead
Connect the equipment in accordance with the connection details and
before applying power to the unit, check that the machine has the correct
operating voltage for your mains power supply.
This apparatus is of a class I construction. It must be connected to a mains
socket outlet with a protective earthing connection.
Important note: If there is an earth/ground terminal on the rear panel of
the product then it must be connected to Earth.
WEEE Directive
The Waste Electrical and Electronic Equipment (WEEE)
Directive was agreed on 13 February 2003, along with the
related Directive 2002/95/EC on Restrictions of the use of
certain Hazardous Substances in electrical and electronic
equipment (RoHS). The Waste Electrical and Electronic Equipment Directive
(WEEE) aims to minimise the impacts of electrical and electronic equipment
on the environment during their life times and when they become waste.
All products manufactured by Sonifex Ltd have the WEEE directive label
placed on the case. Sonifex Ltd will be happy to give you information about
local organisations that can reprocess the product when it reaches its “end
of use”, or alternatively all products that have reached “end of use” can be
returned to Sonifex and will be reprocessed correctly free of charge.
Atmosphere/Environment
This apparatus should be installed in an area that is not subject to excessive
temperature variation (<0°C, >50°C), moisture, dust or vibration.
This apparatus shall not be exposed to dripping or splashing, and no objects
filled with water, such as vases shall be placed on the apparatus.

1
AVN-GMC IEEE1588 PTP Grandmaster Clock with GPS Receiver 1
1. AVN-GMC IEEE1588 PTP Grandmaster Clock with GPS Receiver
Introduction
Fig 1-1: The AVN-GMC Front Panel
The AVN-GMCS is a PTPv2 grandmaster clock for use with AoIP
applications. IEEE1588-2008 PTPv2 (precision time protocol) is used to
synchronise all the nodes within a network. To achieve this one of the
nodes must become the master clock and distribute time packets to
the others. The AVN-GMCS is designed to perform this role simply and
accurately, enabling sub micro second synchronisation between all nodes.
The AVN-GMCS supports the Default Profile and in normal operation, the
unit has PTPv2 time stamping resolution to 8nsec. The AVN-GMCS uses
a combination of a GPS receiver, a PLL (phase lock loop) and a specialist
on-board clock device to create the precise, low jitter clock signals required
to drive the physical transceiver’s time stamping circuitry, also providing
holdover if the GPS signal is lost.
The specialist on board clock , which is used to sustain the PTP clock if the
GPS signal is lost, is available in three different types:
TCXO, OXCO and CSAC (Chip Scale Atomic Clock, Caesium), which vary in
both price and accuracy:
AVN-GMCS – TCXO Temperature Compensated Oscillator accurate to 1 part
per million (worst case 1 sec gain/loss every 11.5 days). *
AVN-GMCOS – OCXO Oven Controlled Oscillator accurate to 0.1 parts per
million (worst case 1 sec gain/loss every 115 days). *
AVN-GMCCS – SAC Quantum Atomic Clock accurate to 0.00050 parts per
million (worst case 1 sec gain/loss every 63 years). *
An external sync clock input can act as an alternative reference source to GPS.
Clock outputs, driven from the physical transceiver, can be used to provide
media clocks for external equipment local to the AVN-GMC when it is in
both ‘master’ and ‘slave’ states. The clock outputs are available as a single
AES-3id output and two outputs which can be selected as either word clock
or variable PPS. The wordclock can operate at 32, 44.1, 48, 96, 176.4 and
192kHz. When set as a variable PPS output, the unit can act as a clock master
to distribute a reference frequency to test and measurement equipment.
The front panel of the unit shows the PTP timebase as standard, which is
always set to International Atomic Time (TAI). It can be reconfigured to display
UTC or ‘Local Time’ instead. Local time allows a fixed time offset from UTC
to be applied (useful for time zones) and the accommodation of automatic
daylight saving time changes by entering Spring Forward and Fall Back dates.
The built-in webserver, or front panel OLED display, can be used to configure
the unit. Front panel LEDs show the synchronisation status, reference lock
status and the status of the AC and DC power supply inputs.
The brightness of the OLED display and LED indicators can be adjusted for low
or high lighting conditions
4 general purpose outputs indicate critical states for the unit using a 9 way
D-type connector mounted on the rear panel. Pull down when active pins are
supplied for reference source, reference lock status, AC power present and DC
power present.
* This figure represents the holdover accuracy should the GPS signal be lost - this is an
approximation based on 1st year stability figures.

2
1 AVN-GMC IEEE1588 PTP Grandmaster Clock with GPS Receiver
The unit has a front panel power button and dual power connectors - an IEC
mains input and a 12V DC input, which allows the AVN-GMCS to be used for
both studio and mobile installations. Moreover this allows for a secondary
power source to reduce the effect of power down events. In any case, the
unit monitors the status of both power sources and displays this on the front
panel.
The unit can be put into a low-power sleep mode when not in use, with
an instant start when power is re-applied. In power off situations, a super
capacitor is used to keep the GPS receiver powered in a low power mode for
more than 20 hours, enabling the receiver to regain lock immediately rather
than having to ‘cold’ start. A Real-Time Clock (RTC) is fitted to hold the time
over power off conditions.
Front Panel Display & Indicators
Front Panel Indicators
Ethernet
An indication of network link status. This LED is
green when an Ethernet link is established or
red when the link is down.
GPS
If the unit is using GPS as its primary
synchronisation source, this LED is illuminated
green.
Sync In
If the unit is using the external input as the primary synchronisation source,
this LED is illuminated green.
Lock
GPS Mode:
Green - The GPS receiver has locked to 4 or more satellites.
Yellow - The GPS receiver has locked to 3 satellites.
Red - The GPS receiver has locked to 2 or fewer satellites.
Ext Sync Mode:
Green - The input sync clock is valid.
Red - The input sync clock is invalid or disconnected.
Master
Green - This means that the PTP state of the unit is set to
Master.
Yellow - This shows that the unit is in another PTP state other
than Master or Slave.
Red - This means that the PTP state of the unit is set to Slave.
AC PSU & DC PSU
The colour of these LEDs show the state of each power input:
Green - This means that the cable is plugged in and is providing the correct
voltage level, within the range 11V to 13V.
Yellow - This means that the cable is plugged in but the voltage level is in a
warning state, within the ranges of either 10V to 11V or 13V to 14V.
Red - This means that the cable is unplugged or the voltage level is out of
specification (less than 10V or more than 14V).
Fig 1-2: Front Panel
Indicators

3
AVN-GMC IEEE1588 PTP Grandmaster Clock with GPS Receiver 1
Display & Spinwheel
Fig 1-3: Display & Spinwheel
The front panel contains an OLED monochrome display which is normally
used to show unit statuses and settings . The display is used with the
spinwheel and directional buttons to navigate, select and edit parameters &
settings via the menu structure.
Fig 1-4: Default Screen Display
From the top, left column:
Device ID
Active PTP profile
Number of Satellites detected
Average Signal Strength – Each bar represents 10dBHz
From the top, right column:
Time displayed in 24 hour, hh:mm:ss format and the selected time base
Date displayed in the selected date format.
External sync input frequency
Selected word clock output frequency
Selected VarPPs output frequency
Power Button
This puts the unit in and out of standby mode.
Standby Mode - Power button is red
Normal Powered Mode - Power button is green
On applying power to the AC mains or DC power inputs, the button is
illuminated red, meaning that it is in standby mode. In standby mode, all
operation is halted. A momentary press of the power button restarts the
unit into normal power mode.
To put the unit into standby mode, press and hold the button for two
seconds, then release it. The current mode is remembered through a power
cycle and the standby mode can also be disabled through the webserver.
Resetting the unit then holding down the power button puts the unit into
boot loader mode.
GPS Operation
The unit will begin collecting GPS information as soon as an antenna is
connected. The number of satellites found is displayed on the front panel,
along with the average signal strength. More in depth lock information is
included on the web server ‘Device Info’ page. On boot up, the unit can
take a few minutes to deliver the first GPS fix. After this, the on-board super
capacitor will enable the receiver to store the data required to perform
a quick start on power up. The super capacitor will power the receiver’s
memory for more than 20 hours.

4
1 AVN-GMC IEEE1588 PTP Grandmaster Clock with GPS Receiver
Rear Panel Connectors
Sync Input
This is a 50Ωinput used to connect an external synchronisation source to
drive the internal PTP clock. Connect a wordclock to this input and from
the menu select Device Settings> Reference Input> External Sync Input
to enable it and select the sample rate. This allows the distribution of an
existing station wordclock through the network. Supported sample rates are
32, 44.1, 48, 88.2, 96, 176.4, 192kHz and 10MHz.
WC (Wordclock) Output
This is a 50ΩTTL level wordclock output which is synchronised to the
onboard PTP clock. The rate is selectable from the front panel menu (Device
Settings> Wordclock) or the webserver. Selectable sample rates are 32,
44.1, 48, 88.2, 96, 176.4, and 192kHz.
AES-3id Output
This is a 75ΩAES-3id digital audio signal, with muted audio, that is
synchronised to the onboard PTP clock. The rate is selectable from the front
panel menu (Device Settings> AES-3id) or the webserver. Selectable sample
rates are 32, 44.1, 48, 88.2, 96, 176.4, and 192 kHz.
Variable PPS (Pulse Per Second) Output
This 50Ωoutput is synchronised to the onboard PTP clock and the rate is
selectable through the front panel menu (Device Settings> Variable PPS)
and webserver. Selectable rates are 1Hz, 10, 100, 1kHz, 10k, 100k & 1MHz.
Note: The Wordclock and Variable PPS Outputs can both provide either
Wordclock or Variable PPS Outputs. This is selected from the front panel or
through the webserver.
GPS Antenna
An SMA socket is used for connection to an active or passive GPS antenna.
GPI/O Remote Input/Output Connector
A 9 way D-type female connector contains 4 open-collector outputs and 4
active low inputs. The 4 outputs provide alarms/indicators for:
Pin # Type Function Action
1Output GPS or External Sync Open collector to ground when
GPS selected
2Output Lock indication Open collector to ground when
selected reference (GPS or
External) is locked. (Follows Lock
LED).
3Output AC Power status Open collector to ground when AC
present
4Output DC Power status Open collector to ground when DC
present
5Ground Ground reference
6Input Not used
7Input Not used
8Input Not used
9Input Not used
Fig 1-5: AVN-GMC Rear Panel

5
AVN-GMC IEEE1588 PTP Grandmaster Clock with GPS Receiver 1
Ethernet
This is a standard 100BASE-T CAT5 Ethernet RJ45 connector to connect
the unit to the network. The connector has two LEDs that indicate data
throughput and link status. The unit can be controlled remotely over the
Ethernet connection using the built-in webserver.
12V DC Power Input
This 12V power input provides a secondary power source on a KPJX-45 plug.
It accepts voltages in the range of 11.5V - 13.2V and must be able to source
500mA. Both mains and DC power sources can be connected at the same
time, so the DC input can act as an alternative redundant power supply.
IEC Mains Input
Power is applied via a standard three-pin IEC male socket. Mains voltages
between 85V and264V AC and frequencies between 47 and 63Hz are
accepted without adjustment. The Mains input is protected by a 1A, 5 x
20mm 250V rated fuse. The Earth pin MUST be connected to ensure safety.
Front Panel Menu Navigation
The menu is entered by holding the centre
button (the ‘OK’ button) of the rotational and
directional spinwheel.
Use the four UP, DOWN, LEFT and RIGHT
directional buttons at the outer edge of
spinwheel to move within the menu.
Once entered a number of pages can be chosen by moving the highlight
using the directional buttons, or by rotating the spinwheel (Clockwise =
DOWN, Anti Clockwise = UP).
Select a Page - Use the OK button, or the RIGHT button
Exit a Page - Use the BACK menu item or the LEFT button.
Exit the Menu Structure - Use the CLOSE menu item, usually at the bottom.
Each dialog page contains a number of options in one of the following
control formats:
String Entry/Edit - Move the cursor highlight to the character that you want
to edit/alter. Use the spinwheel to cycle through the available characters.
A push of the centre OK button changes the character to its default value
which is 'A'. To move to the next character press the RIGHT button.
To end the entry, press the DOWN button and then LEFT/RIGHT directional
buttons to highlight the 'OK' screen box to confirm or the 'CANCEL' box to
ignore the new string and return to the previous one. Press the OK button
to action your choice. Please note, the first and last characters cannot be a
'-'.
IP Address Edit - Move the highlight to one of the 4 IP numbers using the
directional LEFT/RIGHT buttons. These are 3 digit strings which will cycle
from 000 to 255 (and back around), using the spinwheel. Once you have
entered the 4 numbers, use the DOWN button to move to either the 'OK' or
'CANCEL' screen options and press the OK button.
Number Edit - Use the spinwheel to change the number. The number
range is set according to which option has been selected. Once you have
finished, move to either the 'OK' or 'CANCEL' screen options and press the
OK button.
Scale Edit - Use the spinwheel to change the position of the scale bar. Once
you have finished, move to either the ‘OK’ or ‘CANCEL’ screen options and
press the OK button.
Select List Option - Move the cursor highlight to the desired list item and
press the OK button to select it. A tick appears next to the selected option.
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RIGHTLEFT
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OK
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6
1 AVN-GMC IEEE1588 PTP Grandmaster Clock with GPS Receiver
AVN-GMC Menu Tree
Main Menu
Device Information -> Info about the device, Serial Number, Firmware Versions, Network Info & Voltages
Network Settings
Host Name → Dialog to set Bonjour host name
IP Address → Dialog to set Static IP address of system
Subnet Mask → Dialog to set Subnet Mask of system
Gateway → Dialog to set Gateway address of system
Network Mode → List selection from Static IP Mode, or Auto IP or DHCP with failover to Static IP Address or to Auto-IP
PTP Profiles
DSCP → List selection from DSCP method from 22 available
Active Profile → List selection from Default , AES media, SMPTE, AES-SMPTE and Custom
Default
Delay Mechanism → List selection from E2E or P2P mechanisms
Announce Interval → List selection from Interval of 1 to 16 seconds
Announce Timeout → Dialog to set Timeout from 2 to 10 announce intervals
Sync Interval → List selection from Interval of 1/2 to 2 seconds
Del Req Interval → List selection from Interval of 1 to 32 seconds
PDel Req Interval → List selection from Interval of 1/2 to 16 seconds
Priority 1 → Dialog to Set Priority 1 level between 0 to 255
Priority 2 → Dialog to Set Priority 2 level between 0 to 255
Domain → Dialog to set Domain between 0 to 127
Reset to Defaults
AES Media
Delay Mechanism → List selection from E2E or P2P mechanisms
Announce Interval → List selection from Interval of 1 to 16 seconds
Announce Timeout → Dialog to set Timeout from 2 to 10 announce intervals
Sync Interval → List selection from Interval of 1/16 to 2 seconds
Del Req Interval → List selection from Interval of 1/8 to 32 seconds
PDel Req Interval → List selection from Interval of 1/2 to 16 seconds
Priority 1 → Dialog to Set Priority 1 level between 0 to 255
Priority 2 → Dialog to Set Priority 2 level between 0 to 255
Domain → Dialog to set Domain between 0 to 255
Reset to Defaults
SMPTE
Delay Mechanism → List selection from E2E or P2P mechanisms
Announce Interval → List selection from Interval of 1/8 to 2 seconds
Announce Timeou → Dialog to set Timeout from 2 to 10 announce intervals
Sync Interval → List selection from Interval of 1/16 to 1/2second
Del Req Interval → List selection from Interval of 1/16 to 1/2 second
PDel Req Interval → List selection from Interval of 1/2 to 16 seconds
Priority 1 → Dialog to Set Priority 1 level between 0 to 255
Priority 2 → Dialog to Set Priority 2 level between 0 to 255
Domain → Dialog to set Domain between 0 to 127
Reset to Defaults
AES-SMPTE
Delay Mechanism → List selection from E2E or P2P mechanisms
Announce Interval → List selection from Interval of 1 to 2 seconds
Announce Timeout → Dialog to set Timeout from 2 to 10 announce intervals
Sync Interval → List selection from Interval of 1/2 seconds
Del Req Interval → List selection from Interval of 1 to 16 seconds
PDel Req Interval → List selection from Interval of 1/2 to 16 seconds
Priority 1 → Dialog to Set Priority 1 level between 0 to 255
Priority 2 → Dialog to Set Priority 2 level between 0 to 255
Domain → Dialog to set Domain between 0 to 127
Reset to Defaults
Custom
Delay Mechanism → List selection from E2E or P2P mechanisms
Announce Interval → List selection from Interval of 1/8 to 64 seconds
Announce Timeout → Dialog to set Timeout from 2 to 10 announce intervals
Sync Interval → List selection from Interval of 1/16 to 64 seconds
Del Req Interval → List selection from Interval of 1/16 to 64 seconds
PDel Req Interval → List selection from Interval of 1/2 to 16 seconds
Priority 1 → Dialog to Set Priority 1 level between 0 to 255
Priority 2 → Dialog to Set Priority 2 level between 0 to 255
Domain → Dialog to set Domain between 0 to 255
Reset to Defaults
Device Settings
Device ID → Dialog to enter Unit name for user identification
Reference Input → Select the time reference Source between GPS and External Sync Input
WC Out Source → Select Word Clock output from Word Clock and VarPPS
VarPPS Out Source → Select VarPPS output from Word Clock and VarPPS
Word Clock → Select the rate of the External Wordclock output from 32 to 192kHz
Variable PPS → Select the rate of the Variable PPS output from 1Hz to 1MHz
Standby Mode → Select to enable or disable standby button
Display Settings
LED Brightness → Set the brightness of the indicator LEDs and the SONIFEX logo
Screen Timeout → Set a time in minutes between 1 and 9
Screen Saver → Set unit’s screen saver to a blank screen or a big clock display
Screen Contrast → Set the level of screen contrast to suit different viewing angles and ambient lighting conditions
Time Settings
Display Time → Select the Time displayed between TAI, UTC, or Local time
Date Format → Select between D/M/Y, M/D/Y and Y/M/D format
Local Offset → Set the local time offset from UTC
DST (Daylight saving) Offset → Set DST offset between 0h and 2h:30 in 30 minute increments
DST Toggle Time → Set the time of day at which the offset will toggle
DST Toggle Date → Set the date on which the offset will toggle
DST Toggle → Set whether the toggle is enabled
Force Time → Set unit PTP time if running from an external sync input
Force Date → Set unit PTP date if running from an external sync input

7
AVN-GMC IEEE1588 PTP Grandmaster Clock with GPS Receiver 1
Fig 1-6: AVN-GMC Menu Tree (V2.1)
Main Menu
Device Information -> Info about the device, Serial Number, Firmware Versions, Network Info & Voltages
Network Settings
Host Name → Dialog to set Bonjour host name
IP Address → Dialog to set Static IP address of system
Subnet Mask → Dialog to set Subnet Mask of system
Gateway → Dialog to set Gateway address of system
Network Mode → List selection from Static IP Mode, or Auto IP or DHCP with failover to Static IP Address or to Auto-IP
PTP Profiles
DSCP → List selection from DSCP method from 22 available
Active Profile → List selection from Default , AES media, SMPTE, AES-SMPTE and Custom
Default
Delay Mechanism → List selection from E2E or P2P mechanisms
Announce Interval → List selection from Interval of 1 to 16 seconds
Announce Timeout → Dialog to set Timeout from 2 to 10 announce intervals
Sync Interval → List selection from Interval of 1/2 to 2 seconds
Del Req Interval → List selection from Interval of 1 to 32 seconds
PDel Req Interval → List selection from Interval of 1/2 to 16 seconds
Priority 1 → Dialog to Set Priority 1 level between 0 to 255
Priority 2 → Dialog to Set Priority 2 level between 0 to 255
Domain → Dialog to set Domain between 0 to 127
Reset to Defaults
AES Media
Delay Mechanism → List selection from E2E or P2P mechanisms
Announce Interval → List selection from Interval of 1 to 16 seconds
Announce Timeout → Dialog to set Timeout from 2 to 10 announce intervals
Sync Interval → List selection from Interval of 1/16 to 2 seconds
Del Req Interval → List selection from Interval of 1/8 to 32 seconds
PDel Req Interval → List selection from Interval of 1/2 to 16 seconds
Priority 1 → Dialog to Set Priority 1 level between 0 to 255
Priority 2 → Dialog to Set Priority 2 level between 0 to 255
Domain → Dialog to set Domain between 0 to 255
Reset to Defaults
SMPTE
Delay Mechanism → List selection from E2E or P2P mechanisms
Announce Interval → List selection from Interval of 1/8 to 2 seconds
Announce Timeou → Dialog to set Timeout from 2 to 10 announce intervals
Sync Interval → List selection from Interval of 1/16 to 1/2second
Del Req Interval → List selection from Interval of 1/16 to 1/2 second
PDel Req Interval → List selection from Interval of 1/2 to 16 seconds
Priority 1 → Dialog to Set Priority 1 level between 0 to 255
Priority 2 → Dialog to Set Priority 2 level between 0 to 255
Domain → Dialog to set Domain between 0 to 127
Reset to Defaults
AES-SMPTE
Delay Mechanism → List selection from E2E or P2P mechanisms
Announce Interval → List selection from Interval of 1 to 2 seconds
Announce Timeout → Dialog to set Timeout from 2 to 10 announce intervals
Sync Interval → List selection from Interval of 1/2 seconds
Del Req Interval → List selection from Interval of 1 to 16 seconds
PDel Req Interval → List selection from Interval of 1/2 to 16 seconds
Priority 1 → Dialog to Set Priority 1 level between 0 to 255
Priority 2 → Dialog to Set Priority 2 level between 0 to 255
Domain → Dialog to set Domain between 0 to 127
Reset to Defaults
Custom
Delay Mechanism → List selection from E2E or P2P mechanisms
Announce Interval → List selection from Interval of 1/8 to 64 seconds
Announce Timeout → Dialog to set Timeout from 2 to 10 announce intervals
Sync Interval → List selection from Interval of 1/16 to 64 seconds
Del Req Interval → List selection from Interval of 1/16 to 64 seconds
PDel Req Interval → List selection from Interval of 1/2 to 16 seconds
Priority 1 → Dialog to Set Priority 1 level between 0 to 255
Priority 2 → Dialog to Set Priority 2 level between 0 to 255
Domain → Dialog to set Domain between 0 to 255
Reset to Defaults
Device Settings
Device ID → Dialog to enter Unit name for user identification
Reference Input → Select the time reference Source between GPS and External Sync Input
WC Out Source → Select Word Clock output from Word Clock and VarPPS
VarPPS Out Source → Select VarPPS output from Word Clock and VarPPS
Word Clock → Select the rate of the External Wordclock output from 32 to 192kHz
Variable PPS → Select the rate of the Variable PPS output from 1Hz to 1MHz
Standby Mode → Select to enable or disable standby button
Display Settings
LED Brightness → Set the brightness of the indicator LEDs and the SONIFEX logo
Screen Timeout → Set a time in minutes between 1 and 9
Screen Saver → Set unit’s screen saver to a blank screen or a big clock display
Screen Contrast → Set the level of screen contrast to suit different viewing angles and ambient lighting conditions
Time Settings
Display Time → Select the Time displayed between TAI, UTC, or Local time
Date Format → Select between D/M/Y, M/D/Y and Y/M/D format
Local Offset → Set the local time offset from UTC
DST (Daylight saving) Offset → Set DST offset between 0h and 2h:30 in 30 minute increments
DST Toggle Time → Set the time of day at which the offset will toggle
DST Toggle Date → Set the date on which the offset will toggle
DST Toggle → Set whether the toggle is enabled
Force Time → Set unit PTP time if running from an external sync input
Force Date → Set unit PTP date if running from an external sync input
PTP ProlesMain Menu

8
2 AVN-GMC Webserver & Webpage Parameter Details
2. Webserver & Unit Discovery
The AVN-GMC uses the Zeroconf networking methodology to allow the
unit to be a “plug and play” device. Just simply connect it to the network
and use it. The unit is assigned an IP address using a DHCP server, or a self-
assigned address using AutoIP when one isn’t available.
Once the unit has been connected to the network it will try to obtain an IP
address from a DHCP server on the network, if none is found then the unit
will use Auto-IP to assign itself an IP address.
If you’re using the AVN-GMC for the first time, it is configured with a static
IP address of 192.168.0.92 so is accessible by network connecting it to a
PC (or similar device) and entering the following IP address in a browser’s
address bar:
http//:192.168.0.92
The Mozilla Firefox and Google Chrome browsers are preferred.
Bonjour Network Discovery
Using a Bonjour discovery application or browser plug-in, the unit can be
discovered and connected to with relative ease. Bonjour is available as
standard on MAC OS and as plug-in for Internet Explorer for the Bonjour for
windows download. You can also use the discovery application provided by
Sonifex and available from the download page on the Sonifex website.

9
AVN-GMC Webserver & Webpage Parameter Details 2
Fig 2-1: Standard Webpage Layout
Standard Webpage Layout
Webpages include a title bar, which includes the
company logo, the device family logo, the product
name and a brief description of the product.
Under the title bar there is a menu to select which
page is displayed. To select a page, hover the mouse
pointer over a heading so that it becomes highlighted
and click the primary mouse button. If more than
one page is associated with a heading (for example,
‘configuration’ ), a drop down menu will appear. The
currently displayed page is highlighted blue.
The page display area is divided into two, where the
left hand side contains the content and the right
hand side contains the help information associated
with the content.
The page footer contains the company contact
information.
The pages are designed to be resized for tablets
and mobile phones. In cases where horizontal
space becomes limited, the menu will collapse into
a single ‘menu’ heading, from which all pages can
be selected. The help boxes will fall beneath their
associated content boxes.

10
2 AVN-GMC Webserver & Webpage Parameter Details
Fig 2-2: AVN-GMC Status Screen
Status Page Status Indication
The status indication area shows coloured boxes which mirror the front
panel indication LEDs, updated live.
Source->GPS
The indicator is green when the unit is using the GPS input.
Source->Ext Sync
The indicator is green when the unit is using an External Sync input.
Lock
In GPS Sync Mode:
The indicator is green when the unit has GPS lock to 4 or more satellites.
The indicator is yellow when the unit has a GPS lock to 3 satellites.
The indicator is red when the unit has GPS lock to 2 or fewer satellites.
In Ext Sync Mode:
The indicator is green when the unit has a valid Wordclock input.
The indicator is red when the unit does not have a valid Wordclock input.
Master
The indicator is green when the unit is acting as network master clock.
The indicator is red when the unit is a slave to another GMC or PTP clock
generator.
The indicator is yellow when the unit is in transition between slave and
master.
AC and DC Power
The indicator is green when the supplies have a good voltage level.
The indicator is yellow to indicate that the voltages are close to the fail
thresholds.
The indicator is red to indicate that the voltage levels are outside the
correct operating range.
The indicator is off to show that no voltage is being detected.
Actual voltages are displayed in the Device Info Page.

11
AVN-GMC Webserver & Webpage Parameter Details 2
Device Status
The device status box mirrors the information that is available on the front
panel display during normal operation.
Selected Profile
The PTP profile that is currently assigned to the unit.
Number Of Satellites
The number of satellites that are being used to determine the time.
Average Signal Strength
The average signal strength of all the satellites that are currently in use.
Incoming Wordclock
The frequency of the incoming wordclock.
Outgoing Wordclock
The frequency of the outgoing wordclock.
VarPPS
The frequency of VarPPS output.

12
2 AVN-GMC Webserver & Webpage Parameter Details
Fig 2-3: AVN-GMC Device Information Screen
Webpage Parameter Details - Device Information Device Information
The device information box contains important information about the unit
such as Device ID, Host name, serial number, firmware version numbers,
voltage figures, system up time an approximate PTP time reading with time
base and fitted oscillator type.
Network Information
The network information box contains the MAC address, actual IP address,
actual subnet mask, actual gateway IP and the addressing mode.
GPS Satellite Information
This page displays a snap shot of the satellite data for any detected
satellites (up to 16).
Each satellite displays the following parameters:
The identification number of the satellite
Signal Strength (Carrier-to-noise-density ratio)
Elevation Angle
Azimuth angle
Press the Refresh Info button to update the values