Spirent GSS7000 User manual

DGP01430AAA Issue:1-11 Date of Issue: 14 March 2019
Document status: OFFICIAL
GSS7000 SIGNAL GENERATOR USER MANUAL
COVERING SPIRENT’S GSS7000 SIGNAL GENERATOR

PROPRIETARY INFORMATION
THE INFORMATION CONTAINED IN THIS DOCUMENT IS THE PROPERTY OF SPIRENT COMMUNICATIONS
PLC. EXCEPT AS SPECIFICALLY AUTHORISED IN WRITING BY SPIRENT COMMUNICATIONS PLC, THE
HOLDER OF THIS DOCUMENT SHALL KEEP ALL INFORMATION CONTAINED HEREIN CONFIDENTIAL AND
SHALL PROTECT SAME IN WHOLE OR IN PART FROM DISCLOSURE AND DISSEMINATION TO ALL THIRD
PARTIES TO THE SAME DEGREE IT PROTECTS ITS OWN CONFIDENTIAL INFORMATION.
Copyright © 2016 - 2019 Spirent Communications plc

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Contents
Contents
1GENERAL DETAILS 1-1
1.1 This issue................................................................................................................................. 1-1
1.2 Important safety information - GSS7000 signal generators...................................................... 1-1
1.2.1 Hazardous voltages........................................................................................................... 1-1
1.2.2 Mains power inlet .............................................................................................................. 1-1
1.2.3 Earth (ground) connection................................................................................................. 1-2
1.2.4 Rated current..................................................................................................................... 1-2
1.2.5 Fuse rating ........................................................................................................................ 1-2
1.2.6 AC power cable assemblies.............................................................................................. 1-2
1.2.7 Lifting the signal generator................................................................................................ 1-3
1.2.8 Operating and storage....................................................................................................... 1-3
1.2.9 Ventilation for the GSS7000 signal generator ................................................................... 1-3
1.2.10 Dimensions...................................................................................................................... 1-4
1.2.11 Safety statements............................................................................................................ 1-4
1.3 Service information................................................................................................................... 1-4
1.4 Controlling your GSS7000 signal generator............................................................................. 1-4
1.5 Disposal.................................................................................................................................... 1-5
1.6 Referenced documents ............................................................................................................ 1-5
1.7 Copyright and trademark notices.............................................................................................. 1-5
1.8 Intellectual property.................................................................................................................. 1-5
1.9 Document conventions............................................................................................................. 1-5
2GSS7000 INTRODUCTION 2-1
2.1 Hardware channels - GSS7000 signal generator..................................................................... 2-3
2.2 Outline of operation.................................................................................................................. 2-1
2.2.1 Embedded Host................................................................................................................. 2-2
2.2.2 Channel bank.................................................................................................................... 2-2
2.2.3 RF Combiner..................................................................................................................... 2-3
2.2.4 DC power rail indicators .................................................................................................... 2-3
2.2.5 Timer indicators................................................................................................................. 2-5
2.2.6 Reference Oscillator.......................................................................................................... 2-5
2.2.7 Power Supply Unit............................................................................................................. 2-6
3GSS7000 OVERVIEW AND INSTALLATION 3-1
3.1 Front panel............................................................................................................................... 3-1
3.1.1 Indicators........................................................................................................................... 3-1
3.1.2 Ports.................................................................................................................................. 3-2
3.2 Rear panel................................................................................................................................ 3-3
3.2.1 Ports.................................................................................................................................. 3-3
3.2.2 USB port assignment ........................................................................................................ 3-6
3.2.3 LED indicators................................................................................................................... 3-8
3.2.4 Model number and serial number...................................................................................... 3-12
3.2.5 Using dual-output GSS7000-series signal generators as single-output signal generators 3-12
3.3 Installing and using the signal generator.................................................................................. 3-12
3.4 Synchronising from external equipment ................................................................................... 3-13
3.4.1 1PPS IN............................................................................................................................. 3-13
3.4.2 TRIG IN - Immediate mode ............................................................................................... 3-14
3.4.3 TRIG IN - Delayed mode................................................................................................... 3-15
4GSS7000 CALIBRATION AND SERVICE 4-1
4.1.1 Sharp edges...................................................................................................................... 4-1
5SPIRENT GLOBAL SERVICES III

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General details
1General details
Spirent reserves the right to supply signal generator elements that may be superficially and visually different to those
shown in this document or in an interconnection drawing, but which provide equivalent or better performance.
This document includes safety information for safely using Spirent’s GSS7000 signal generators. You must follow all
safety instructions detailed in this document before operating your signal generator.
1.1 This issue
Issue
Date
Description
1-11
Nov.
2018
JIRA PTPD Reference:
17435: Support for QZ L6
1.2 Important safety information - GSS7000 signal generators
NOTICE
Failure to observe the ratings and safety information in this document may result in hazardous
operation
This section contains important safety information for your signal generator.
Only suitably trained and qualified personnel should service these signal generators.
There are no user serviceable parts in these signal generators.
You must follow all safety instructions detailed in this document before using your signal generator.
Do not use your signal generator if it appears damaged.
If your signal generator does not work when you first switch on AC power, completely isolate it from the AC mains
supply by removing the plug from the AC power outlet, then contact Spirent Global Services, page iii.
Do not drop your signal generator.
Do not expose your signal generator to excessive vibration.
Spirent supplies your signal generator for bench use.
For safety information on third-party equipment that Spirent supplies with your signal generator see the manufacturer’s
documentation.
1.2.1 Hazardous voltages
SAFETY WARNING
Do not operate your GSS7000 signal generator with any panel removed
To completely isolate AC mains power remove the plug from the mains outlet
The mains outlet should be close to the signal generator and readily
accessible by the user
1.2.2 Mains power inlet
SAFETY WARNING
The GSS7000 signal generator uses double-pole / Neutral fusing
NOTICE
To prevent blowing mains fuses, Spirent recommends you wait ten seconds before re-
applying mains power
You can use your signal generator with AC mains input voltages in the range 100 to 240 V, 50 to 60 Hz.

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The mains power inlet incorporates:
→An AC power switch
→Fuses of the same type and rating in both the phase and Neutral lines.
The mains fuses are located in a slide-out module in the AC mains inlet.
See Fuse rating, page 1-2, for fuse details. Always fit the same type of fuse to both the phase and
Neutral lines.
1.2.3 Earth (ground) connection
SAFETY WARNING
You must connect your GSS7000 signal generator to AC mains earth (ground)
Note for users in countries with IT power distribution systems: You must connect your signal generator and any
associated AC-mains operated equipment that Spirent supplies, to an earth (ground) that is independent of the earth
(ground) the AC mains provides.
1.2.4 Rated current
This table gives the rated current of your GSS7000 signal generator:
Mains voltage
Maximum rated
current
100 to 240 V AC
50 to 60 Hz
5 A
1.2.5 Fuse rating
Spirent fits T5AH 250VAC fuses to the GSS7000 AC power inlet. You must replace fuses with an approved fuse of the
same type and rating. The fuse rating is:
T:
time lag (anti-surge)
5A:
rating in Amps
H:
high rupture current (ceramic body)
250VAC:
voltage rating
1.2.6 AC power cable assemblies
SAFETY WARNING
You must ensure replacement AC power cable assemblies meet or exceed the
requirements in the following table
Spirent supplies appropriate, approved, AC power cable assemblies with each GSS7000 signal generator. This table
details the requirements for any replacement cable assembly:
Component
Requirements
AC power connector
Appropriate approval to IEC320
Mandatory - earth (ground) connection
Cable
Two-core plus earth (ground) AC power cable
National mains cable approval
Spirent recommends 0.75 mm2 conductor cross-sectional area
AC power plug
To fit local AC power plus earth (ground) outlets
National approval for AC power plugs
Mandatory - earth (ground) connection
Fuse in AC power plug
(where fitted)
National approval for AC power plug fuses

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1.2.7 Lifting the signal generator
CAUTION - HEAVY
The weight of your signal generator lies between
11.2 kg (one channel bank installed)
and
13.5 kg (maximum of four channel banks installed)
Before manual handling, perform a risk assessment following local and
national guidelines
1.2.8 Operating and storage
Do not operate or store your GSS7000 signal generator outside the ranges stated in this table:
Range
Operating
10 to 40°C (50 to 104°F)
40 to 90% RH (non-condensing)
Storage
-40 to 60°C (-40 to 140°F)
20 to 90% RH (non-condensing)
Spirent recommends you always operate your signal generator in a temperature- and humidity-controlled environment
that conforms to the parameters in the table above.
Do not use your signal generator outside the operating parameters in the table above (for example, in a tropical or cold
environment).
Do not use your signal generator at an altitude exceeding 3 000 metres
1.2.9 Ventilation for the GSS7000 signal generator
SAFETY WARNING
Ensure at least 150 mm (six inches) clearance at the front and rear panels of
your GSS7000 signal generator
Note: Failure to provide adequate ventilation may damage your GSS7000 signal generator and invalidate its warranty.
GSS7000 signal generators use three variable speed fans to provide cooling air to internal components. The fans draw
air through slots in the front panel of the case, the air exhausts through ports in the rear panel.
Do not block the exhaust ports on the rear panel and ensure you route cables away from the rearpanel exhaust ports.
1.2.9.1 Thermal protection
You can fit up to four channel banks to your GSS7000 signal generator. Each channel bank comprises one Signal
Generator module and one RF upconverter module.
The Signal Generator module incorporates a thermal sensor that provides optimum cooling by controlling the speed of
the internal cooling fan. An increase in fan noise accompanies an increase in fan speed to provide more cooling air. If
you notice an increase in fan noise during normal operation, Spirent recommends you see Inspect air exhaust ports,
page 1-4, which describes inspecting and cleaning the air inlet and exhaust ports.
In the unlikely event a Signal Generator module sensor exceeds 85°C, the signal generator will perform a controlled
shutdown of Windows and automatically switch off the power supply. In this case:
→Wait for 30 seconds, then
→Turn off the AC power switch on the rear panel, see Mains power inlet, page 1-1, then
→Turn on the rear panel AC power switch
→Start the signal generator by pressing the front panel switch

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1.2.9.2 Embedded Host BIOS battery
The Embedded Host uses a battery to store BIOS settings. Should this battery fail, your GSS7000 signal generator will
continue to function as normal.
The Embedded Host BIOS battery is not user-replaceable; you must contact Spirent Global Services, page iii, to
arrange for BIOS battery replacement.
1.2.9.3 Inspect air exhaust ports
Note: Spirent recommends inspecting the rear panel exhaust ports at least every year. The inspection frequency
depends on the environment and you may need to inspect these ports more frequently.
Before inspecting the exhaust ports, switch off AC power and remove the AC power cable from the signal generator.
All cooling air enters the signal generator through slots in the front panel and exhausts from the rear panel ports.
Remove any accumulated dust using a vacuum cleaner.
In the event of dust build-up on the large rear panel exhaust port, Spirent recommends you inspect the heat sink fitted
to each Signal Generator card. Dust build-up on these heat sinks could adversely affect the operation of your signal
generator, eventually leading to thermal shutdown. Contact Spirent Global Services, page iii, for advice on cleaning
the Signal Generator heat sink.
1.2.10 Dimensions
Parameter
Metric
Imperial
Width
235 mm
9.25 inches
Depth
(overall)
573 mm
22.5 inches
Height
- excluding feet
- including feet, non-extended
177 mm (4U)
198 mm (4U)
7.0 inches (4U)
7.0 inches (4U)
1.2.11Safety statements
Product safety and EMC testing by independent test houses shows the GSS7000 complies with the requirements for
EU CE Marking. You can request a copy of the CE Marking Declaration of Conformity from Spirent.
1.3 Service information
SAFETY WARNING
Before removing the top or bottom covers of your GSS7000 signal generator,
you must turn off the AC power switch and remove the plug from the AC outlet
Rear panel, page 3-3 shows the location of the AC power switch.
Before removing the top or bottom covers, Spirent recommends you read Sharp edges, page 4-1.
1.4 Controlling your GSS7000 signal generator
Reference a) gives more details on controlling your signal generator using SimTEST and remotely controlling your
signal generator using remote commands, which you can run on any PC running Windows.

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1.5 Disposal
Spirent simulator products meet the requirements of the European Union (EU) Waste Electrical and Electronic
Equipment (WEEE) Directive. The WEEE Directive requires Spirent to label products placed on the EU market after
13th August 2005 with this ‘wheeled bin’ symbol:
This symbol indicates the product contains material that presents an environmental concern. Spirent encourages all
users of Spirent-provided electrical and electronic equipment to reuse, recycle and recover electrical and electronic
equipment following all current local and national requirements; and not dispose of any product carrying this label in
landfill.
If you have any questions regarding disposal of Spirent products or this labelling, contact Spirent Global Services,
page iii.
1.6 Referenced documents
Spirent recommends you always refer to the latest issue of any referenced document.
a) DGP01446AAA SimTEST user manual
b) DGP00686AAA SimGEN user manual
c) DGP01449AAA GSS7000, GSS6700 and SimREPLAYplus User Manual
d) MS7000 GSS7000 Datasheet and product specification
Spirent customer procedures:
e) DCS0055D GSS7000 Simulator And Embedded Host Update Procedure
f) DCS0059C GSS7000 Customer Calibration Procedure
g) DCS0060B GSS7000 Channel Bank Field Upgrade Procedure
1.7 Copyright and trademark notices
All other company/product names referenced herein are trademarks and/or service marks or registered trademarks
and/or service marks of their respective holders.
1.8 Intellectual property
Currently, one, or more, U.S. and foreign patents are pending.
1.9 Document conventions
This table shows the format conventions used by this document.
Format
Description
General
Hyperlinked section name, click to go to this section or chapter
Bold text preceding the hyperlink gives the section location.
A hyperlink alone refers to a location in the current chapter.
This figure (or This table)
Hyperlink to a figure or table
Clear
Button (with extra description to avoid ambiguity)
Edit
Mode (with extra description to avoid ambiguity)
Filename.exe
Filename
Note: Simulation mode…
Important information
“Text”
Text entered from PC keyboard

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GSS7000 Introduction
2GSS7000 Introduction
GSS7000 signal generators are precision signal generators, controlled by one of these versions of Spirent’s PosApp
software (your licence determines the version you use):
→SimTEST, see reference a)
→SimGEN, see reference b), or
→SimREPLAYplus, see reference c)
The GSS7000 signal generator supports the following channels on an individually licenced basis:
→BeiDou B1I, BeiDou B2I, BeiDou B3I, BeiDou B1C and BeiDou B2a
→Galileo E1, Galileo E5 (currently, the GSS7000 signal generator is limited to 16 channels for
Galileo E5)
→GLONASS L1, GLONASS L2
→GPS L1, GPS L2, GPS L5
→IRNSS L5 (the GSS7000 signal generator does not support IRNSS S-band)
→QZ L1, QZ L2, QZ L5, QZ L6 (available on every GPS channel if you have a Quasi-Zenith
licence)
→SBAS L1, SBAS L5 (always available as a separate channel with a GPS licence)
With the launch of the last satellite in the constellation, the Indian Regional Navigational Satellite System (IRNSS)
constellation has an operational name of NAVIC (NAVigation Indian Constellation). This document and the SimGEN
user interface continues to refer to this constellation as IRNSS.
The number of available channels depends on the number of channel banks installed in your signal generator and
the number of channels your licence includes; each channel bank providing 64 channels. The maximum four
channel banks provide 256 channel capability. Each signal generator provides a single RF output.
Optionally, Spirent supplies a dual-RF output signal generator, where up to two channel banks (128 channels)
support each RF output port.
Each channel bank:
→Provides a maximum of 64 channels, so your GSS7000 can generate a maximum of 256
channels for a single-output signal generator, and 128 channels (on each RF output) for a dual-
output signal generator
→Supports any frequency band
→At any time, only supports a single frequency band
The constellation and frequency configuration remain fixed for the duration of the scenario.

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2.1 Hardware channels - GSS7000 signal generator
Licenced feature: You will need a licence to use this feature. Contact Spirent for licencing details
Notes:
1) SimTEST enables Hardware channels only for GSS7000 signal generators
2) SimTEST only supports single-output GSS7000 signal generators
3) All hardware channels must allow for the setting of a satellite (assigned to a channel) subsequently rising and being assigned to a different channel. This means hardware
channels must be equally capable; and, consequently, each constellation must allocate the same number of channels to each carrier. For example, the GPS constellation must
allocate an equal number of channels to L1, L2 and L5 (where used).
These examples show using the <scenario>-Vehicle 1-Antenna 1-Hardware channels-GSS7000 channel usage dialog to assign channels between each constellation in a
scenario for a single-output signal generator.
Reference a), b) or c) gives more detail on using this dialog.
Description
GSS7000 channel usage dialog
GSS7000 installed with the maximum four channel banks
(supporting up to 64 channels per channel bank, one frequency
band per channel bank).
This figure uses a licence for 256 channels and the GLONASS
L1 constellation. All four channel banks are in use.
If this GSS7000 had a single channel bank installed, this dialog
would only show Bank 1 populated with 64 GLONASS L1
channels.

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Description
GSS7000 channel usage dialog
One channel bank - maximum 64 channels.
This example uses a licence for 64 channels and the
constellations BeiDou B1I, Galileo E1, GLONASS L1, GPS L1,
EGNOS L1 and Quasi-Zenith L1.
SimTEST initially divides the available channels equally between
constellations, giving fewer channels to SBAS constellations
(where present).
Sliders in the area Maximum number of satellites for each
constellation let you adjust the channels assigned to each
constellation.
This figure shows that reducing the number of Quasi-Zenith
channels to nine increases the number of BeiDou channels to 15
(the total channels remain at 64)
GSS7000 installed with the maximum four channel banks
(supporting up to 64 channels per channel bank, one frequency
band per channel bank).
This figure uses a licence for up to 256 channels and the BeiDou
B1I and B2I, GLONASS L1 and L2, GPS L1 and L2, and Quasi-
Zenith L1 and L2 constellations.
Notice the number of satellites in a constellation remains the
same across the frequency bands

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Description
GSS7000 channel usage dialog
Using the same details as above, the Channel bank
frequencies drop-down lets you move the L2 and L5 frequencies
between different channel banks
Notice the number of channels assigned to a constellation
remains the same across the frequency bands
Using the same details as above, the Channel bank
frequencies drop-down lets you move the L2 and L5 frequencies
between different channel banks
Notice the number of channels assigned to a constellation
remains the same across the frequency bands
You can easily upgrade your signal generator by installing additional channel banks, up to a maximum of four and installing a new licence file to support additional capability; you do
not have to return your signal generator for upgrade.

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GSS7000 Introduction
If you use a dual-output GSS7000 signal generator, assign channels to each RF output using …Antenna 1-Hardware channels and …Antenna 2-Hardware channels. These
figures show examples of the GSS7000 channel usage dialogs for RF output 1 and RF output 2:
If you use a dual-output GSS7000 signal generator as a single-output signal generator, see Using dual-output GSS7000-series signal generators as single-output signal
generators page 3-12, the GSS7000 channel usage dialog combines RF output 1 and RF output 2:

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2.2 Outline of operation
These figures are simplified diagrams of the major modules in a single- and dual-output GSS7000 signal generator:
Single-output
Dual-output
Embedded Host, page 2-2, to Power Supply Unit, page 2-6, give top-level descriptions of the modules shown in the
diagram above.

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2.2.1 Embedded Host
Note: SimTEST does not support IEEE-488
The Embedded Host is a high-performance single board computer using a solid-state hard disk drive for reliability. The
Embedded Host provides these interfaces at the rear panel:
→DisplayPort monitor socket
→USB2 and USB3 ports
→Two Ethernet ports (one for general network connectivity, one for use with Spirent products)
PosApp running on the Embedded Host requires the engine runs on a real-time operating system (Linux), while the GUI
runs on the Windows operating system. Separate Embedded Host processor cores (one each for engine and GUI)
provide adequate performance for calculation of parameters, such as vehicle trajectories for up to 256 simulated
satellite channels. The engine calculates the new parameters and sends them to the channel banks in time for the next
epoch.
Spirent recommends you do not install any other third-party software on the Embedded Host.
If you need to use your Embedded Host with devices using RS-232 interfaces, you must use the USB to RS-232
adaptor Spirent supplies.
2.2.1.1 BIOS battery
SAFETY WARNING
Risk of explosion if battery is replaced with an incorrect type
Recycle batteries where possible
Dispose of used batteries in accordance with local and national environmental
regulations
The Embedded Host uses a battery to store BIOS settings. Should this battery fail, your GSS7000 signal generator will
continue to function as normal.
The Embedded Host BIOS battery is not user-replaceable; you must contact Spirent Global Services, page iii, to
arrange for BIOS battery replacement.
2.2.2 Channel bank
Each channel bank consists of one Signal Generator module and one RF Upconverter module. The Signal Generator
module is a different length to the RF Upconverter module, preventing incorrect installation in the card frame.
Each channel bank can generate up to 64 channels of any frequency. Your licence sets the number of channels and the
frequencies you can use. A single-output GSS7000 can generate up to 256 satellite channels with the maximum of four
channel banks installed; a dual-output GSS7000 can generate up to 128 satellite channels for each RF output with the
maximum of four channel banks installed.
The Embedded Host delivers simulation commands and data to each channel bank over an internal bus.
Each Signal Generator module includes thermal sensing that will shut down the signal generator power supply if the
sensor temperature exceeds 85°C. In the unlikely event of a thermal shutdown, Spirent recommends you do not restart
the signal generator for at least 30 seconds.
A semi-rigid coaxial cable links the RF Upconverter in the channel bank to the RF Combiner.
The single-output variant incorporates a single RF combiner; the dual-output variant incorporates two RF Combiners.
A single fan draws air from slots in the front panel to cool the channel bank. The cooling air exhausts at the rear panel.
If you remove channel banks from your signal generator, you must fit the dummy module covers to ensure the flow
cooling air is not disturbed.
2.2.2.1 Visible indicators
Indicator on Signal
Generator cover
Colour
Description
F4
Orange
Note: Only if RF Upconverter module present in same slot
Off - RFU data link Error
On - RFU data link OK

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Indicator on Signal
Generator cover
Colour
Description
F5
Orange
Note: Only if RF Upconverter module present in same slot
Off - RFU communications link Error
On - RFU communications link OK
F6
Orange
Not used by the GSS7000
F7
Orange
Not used by the GSS7000
F8
Orange
Not used by the GSS7000
F9
Orange
Not used by the GSS7000
F10
Orange
Off - No Channels running
On - At least one Channel running
F11
Orange
Off - Status OK
Flashing - Status Error
P1
Orange
Off - PIC error
On - PIC OK
P2
Orange
Off - PIC error
On - PIC OK
DONE
Green
Off - FPGA not loaded
On - FPGA loaded
P4
Red
Off - PIC not OK
On - PIC OK
F5
Green
Indicator is permanently on
DONE
Green
Off - FPGA not loaded
On - FPGA loaded
P3, F6, F7
n/a
Currently not in use
2.2.3 RF Combiner
Note: Do not remove 50 Ohm terminations on RF Combiner ports.
The RF Combiner is a passive component that combines the outputs of each channel bank (single-output variant), or
two channel banks (dual-output variant); and any signal applied at the rear panel EXT SIG IN port.
The RF Combiner output connects directly to the front panel ‘RF OUT’ port and to the rear panel ‘HIGH LEVEL’ RF
output port.
2.2.4 DC power rail indicators
DC power rail indicators are only visible with the GSS7000 side covers removed.
You must look through the slot in the side casing shown in the figure below (front panel is on the left-hand side) to see
the DC power rail indicators:

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DC power rail
indicator reference
Colour
Description
PECL_VCC
Green - power rail on
Off - power rail off
RF power rail
3V8
Green - power rail on
Off - power rail off
RF power rail
5V5
Green - power rail on
Off - power rail off
RF power rail
12V_RF
Green - power rail on
Off - power rail off
RF power rail
MGT
Green - power rail on
Off - power rail off
Timer FPGA rail
1V2
Green - power rail on
Off - power rail off
Timer power rail
5V_TIMER
Green - power rail on
Off - power rail off
Timer power rail
5V_SHB
Green - power rail on
Off - power rail off
Single board computer rail
12V_SHB
Green - power rail on
Off - power rail off
Single board computer rail
3V3PMRC
Green - power rail on
Off - power rail off
Standby power rail
3V3
Green - power rail on
Off - power rail off
Digital power rail
12V_DIG
Green - power rail on
Off - power rail off
Digital power rail