Rohde&Schwarz CTS50, CTS55 Operating Manual

Test and Measurement
Division

Operating Manual

Digital Radio Tester
for
GSM (GSM 900) -

PCN (GSM 1800 / DCS 1800) ­PCS (GSM 1900 / DCS 1900) ­Mobiles

R&S
R&S

1094.0006.50

1094.0006.55



CTS50



CTS55

Printed in Germany

1094.3405.12-11- 1

Dear Customer,
R&S® is a registered trademark of Rohde & Schwarz GmbH & Co. K G .

Trade names are trademarks of the owners.

1094.3405.12-11- 2

Note

Digital Radio Tester CTS50 is a basic model, and options
CTS-K9, CTS-K18 and CTS-K19 enable its use with operating modes
GSM, PCN and PCS, respectively.

1094.3392.12-01- A E-3

CTS55 Contents

Contents

Data Sheet

1 Introduction..................................................................................................................................1.1

1.1 Application for the Autotest.....................................................................................................1.1

1.1.1 Overview........................................................................................................................1.1

1.1.2 Test Functions in the Autotest .......................................................................................1.1

1.2 Quicktest....................................................................................................................................1.2

1.3 Application for the Manual Test..............................................................................................1.2

1.4 Application for the Module Test (Option CTS-B7).................................................................1.2

1.5 Remote Control (Option CTS-K6)............................................................................................1.2

2 Preparation for Use...................................................................................................................2.1

2.1 Explanation of Front and Rear View.......................................................................................2.2

2.2 Commissioning.........................................................................................................................2.3

2.2.1 Setting up the Instrument...............................................................................................2.3

2.2.2 Connecting the Instrument to the AC Supply.................................................................2.4

2.2.3 Ensuring Electromagnetic Compliance (EMC)...............................................................2.5

2.2.4 Switching on the Instrument...........................................................................................2.5

2.2.5 Options List ....................................................................................................................2.5

2.2.6 OCXO Reference Oscillator (Option CTS-B1)...............................................................2.6

2.2.7 Connecting an External Keyboard .................................................................................2.6

2.2.8 Connecting an External Monitor.....................................................................................2.6

3 Getting Started With Autotest...............................................................................................3.1

3.1 Overview....................................................................................................................................3.1

3.2 Test of Mobile............................................................................................................................3.4

1094.3405.12 3 E-11

Contents CTS55

4 Autotest Sequence in Detail..................................................................................................4.1

4.1 General.......................................................................................................................................4.1

4.2 1st Step - Start...........................................................................................................................4.3

4.3 2nd Step - Location Update.....................................................................................................4.6

4.4 3rd Step - Call to MS.................................................................................................................4.7

4.5 4th Step - Echo Test .................................................................................................................4.7

4.6 5th Step - MS Release ..............................................................................................................4.7

4.7 6th Step - Call From MS ...........................................................................................................4.8

4.8 7th Step - MS Average Power ..................................................................................................4.9

4.9 8th Step - Sensitivity (RxLev and RxQual)...........................................................................4.11

4.10 9th Step - Phase/Frequency Error and Power Ramp...........................................................4.11

4.11 10th Step - Bit Error Rate.......................................................................................................4.12

4.12 Steps 11 - 14 - Measurements on the second channel.......................................................4.12

4.13 15th Step – Handover or Network Release...........................................................................4.12

4.14 Test Sequence in Single Step Mode.....................................................................................4.13

4.15 Viewing the results of a two band autotest sequence........................................................4.13

5 Getting Started With Quicktest.............................................................................................5.1

5.1 Overview....................................................................................................................................5.1

5.2 Test of Mobile............................................................................................................................5.2

6 Getting Started With Manual Test.......................................................................................6.1

6.1 Overview....................................................................................................................................6.1

6.2 Test of Mobile............................................................................................................................6.2

6.3 Transmitter Measurements....................................................................................................6.10

6.4 Receiver Measurements.........................................................................................................6.12

6.4.1 BER Sensitivity measurement......................................................................................6.14

1094.3405.12 4 E-11

CTS55 Contents

GPRS/BLER Measurements...................................................................................................6.15

6.5

6.5.1 GPRS Attach................................................................................................................6.15

6.5.2 GPRS Block Error Rate ...............................................................................................6.16

6.5.3 GPRS Detach...............................................................................................................6.16

7 Module Test..................................................................................................................................7.1

7.1 Overview....................................................................................................................................7.1

7.2 Menu hierarchy .........................................................................................................................7.2

7.3 Starting Module Test................................................................................................................7.3

7.4 Burst Analysis...........................................................................................................................7.4

7.4.1 Configuration..................................................................................................................7.4

7.4.2 Running the Burst Analysis measurement.....................................................................7.5

7.4.3 The Measurement Results.............................................................................................7.6

7.4.4 Other Measurements .....................................................................................................7.7

7.4.4.1 Power Ramp...................................................................................................7.7

7.4.4.2 Phase Frequency............................................................................................7.8

7.5 IQ Spectrum...............................................................................................................................7.9

7.5.1 Configuration..................................................................................................................7.9

7.5.2 Running the IQ Spectrum measurement .....................................................................7.10

7.5.3 The Measurement Results...........................................................................................7.10

7.5.4 The Sensitive Power Measurement.............................................................................7.11

7.6 RF Signal Generator...............................................................................................................7.13

7.7 Technical Information ............................................................................................................7.14

7.7.1 Frequency ranges........................................................................................................7.14

8 RF connection..............................................................................................................................8.1

8.1 RF Connection of the Mobile Phone Using a Cable..............................................................8.1

8.2 RF Connection of the Mobile Phone Using an Antenna Coupler........................................8.1

1094.3405.12 5 E-11

Contents CTS55

9 Detailed Description of the Menus......................................................................................9.1

9.1 Menu Structure Overview ........................................................................................................9.1

9.2 Menu Structure Graph..............................................................................................................9.2

9.3 Some Basic Elements of the Man Machine Interface............................................................9.3

9.3.1 Multi Field Editing...........................................................................................................9.3

9.3.2 Single Field Editing ........................................................................................................9.4

9.3.3 Single Field Editing with Direct Saving...........................................................................9.4

9.4 Home Menu ...............................................................................................................................9.5

9.5 Auto Test Menus.......................................................................................................................9.6

9.5.1 Autotest Start Menu .......................................................................................................9.6

9.5.2 Autotest Config Menu.....................................................................................................9.7

9.5.3 Autotest Running Menu (Pass/Fail) ...............................................................................9.8

9.5.4 Autotest Running Menu (Values)...................................................................................9.9

9.5.5 Autotest Tolerances Menu...........................................................................................9.10

9.5.6 Autotest Result Screen ................................................................................................9.11

9.6 Quicktest Menus.....................................................................................................................9.12

9.6.1 Quicktest Main Menu ...................................................................................................9.12

9.6.2 Config-Quicktest Menu ................................................................................................9.13

9.6.3 Quicktest - Test Menu..................................................................................................9.14

9.6.4 Quicktest - Result Menu...............................................................................................9.15

9.7 Manual Test Menus.................................................................................................................9.16

9.7.1 MS Test/Wait Sync Menu ............................................................................................9.16

9.7.2 Manual Test Menu .......................................................................................................9.17

9.7.3 Select MS Type Menu..................................................................................................9.18

9.7.4 MS Test/Updated Menu...............................................................................................9.19

9.7.4.1 Handover Details Menu................................................................................9.20

9.7.5 Call Established Menu .................................................................................................9.21

9.7.6 Power Ramp Menu ......................................................................................................9.23

9.7.7 Phase Frequency Menu...............................................................................................9.24

9.7.8 Bit Error Rate Menu .....................................................................................................9.25

9.7.9 BER Sensitivity measurement......................................................................................9.26

1094.3405.12 6 E-11

CTS55 Contents

Measurement Configuration Menus .....................................................................................9.27

9.8

9.8.1 Config Power Ramp.....................................................................................................9.27

9.8.2 Config Phase/Freq Menu.............................................................................................9.28

9.8.3 Config BER Menu ........................................................................................................9.29

9.8.4 Config BER Sensitivity.................................................................................................9.30

9.9

General Configuration Menus...............................................................................................9.31

9.9.1 Config - Select..............................................................................................................9.31

9.9.2 Config BS Signal..........................................................................................................9.32

9.9.3 Config Channels...........................................................................................................9.33

9.9.4 Config Quicktest (Channel)..........................................................................................9.34

9.9.5 Config MS Type and MS Type Edit..............................................................................9.35

9.9.6 Config Network ............................................................................................................9.37

9.9.7 Config Date/Time.........................................................................................................9.38

9.9.8 Config Language..........................................................................................................9.39

9.9.9 Config Password..........................................................................................................9.40

9.9.10 Comment Menu ...........................................................................................................9.41

9.9.11 Config Keyboard Menu ................................................................................................9.42

9.9.12 Config Com Port ..........................................................................................................9.43

9.9.13 Config Dual Band Handover Menu ..............................................................................9.44

9.9.13.1 Handover Network........................................................................................9.45

9.9.13.2 Handover Check...........................................................................................9.45

9.9.13.3 Handover Mode ............................................................................................9.46

10 Enhanced Measurement and Test Report Printout..................................................10.1

1094.3405.12 7 E-11

Contents CTS55

11 Remote Control.........................................................................................................................11.1

11.1 Introduction.............................................................................................................................11.1

11.2 Brief Instructions....................................................................................................................11.1

11.3 Switchover to Remote Control..............................................................................................11.2

11.4 Device Messages (Commands and Device Responses).....................................................11.2

11.5 Structure and Syntax of the Device Messages....................................................................11.3

11.5.1 SCPI Introduction.........................................................................................................11.3

11.5.2 Structure of a Command..............................................................................................11.3

11.5.3 Structure of a Command Line......................................................................................11.5

11.5.4 Responses to Queries .................................................................................................11.7

11.5.5 Parameters ..................................................................................................................11.8

11.5.6 Overview of Syntax Elements ....................................................................................11.10

11.6 Description of Commands...................................................................................................11.11

11.6.1 Notation......................................................................................................................11.11

11.6.2 Common Commands.................................................................................................11.13

11.7 Instrument Model and Command Processing ...................................................................11.16

11.8 Status Reporting System.....................................................................................................11.17

11.8.1 Structure of an SCPI Status Register ........................................................................11.17

11.8.2 Overview of the Status Registers...............................................................................11.19

11.8.3 Description of the Status Registers............................................................................11.20

11.8.3.1 Status Byte (STB) and Service Request Enable Register (SRE)...............11.20

11.8.3.2 Event-Status-Reg. (ESR) and Event-Status-Enable-Reg. (ESE)...............11.21

11.8.4 Error-Queue Query....................................................................................................11.22

11.8.5 Resetting Values of the Status Reporting System.....................................................11.22

11.9 Examples...............................................................................................................................11.23

1094.3405.12 8 E-11

CTS55 Contents

12 Software Options......................................................................................................................12.1

12.1 Overview..................................................................................................................................12.1

12.2 Menu hierarchy .......................................................................................................................12.1

12.3 Setting the Serial Number......................................................................................................12.2

12.4 Setting the Code Number to enable an option ....................................................................12.3

13 Performance Test (with Service Software) ....................................................................13.1

13.1 Starting the Program..............................................................................................................13.1

13.2 Operating the Program...........................................................................................................13.1

13.3 Tests To Be Performed ..........................................................................................................13.2

13.4 Remote Control of Performance Test Program...................................................................13.3

13.4.1 Hardware......................................................................................................................13.3

13.4.2 Command syntax.........................................................................................................13.3

13.4.3 Command types...........................................................................................................13.5

13.4.4 Special functions, device interdependencies...............................................................13.6

13.4.5 Command Overview (GSM Performance Test)...........................................................13.7

Annex A: Interfaces
Annex B: List of Error Messages
Annex C: List of Commands
Annex D: MS Power Charts

Index

Tabbed Divider:
Windows Application CTSgo to CTS-K6

1094.3405.12 9 E-11

Before putting the product into operation for

the first time, make sure to read the following

Safety Instructions

Rohde & Schwarz makes every effort to keep the safety standard of its products up to date and to offer
its customers the highest possible degree of safety. Our products and the auxiliary equipment required
for them are designed and tested in accordance with the relevant safety standards. Compliance with
these standards is continuously monitored by our quality assurance system. This product has been
designed and tested in accordance with the EC Certificate of Conformity and has left the manufacturer’s
plant in a condition fully complying with safety standards. To maintain this condition and to ensure safe
operation, observe all instructions and warnings provided in this manual. If you have any questions
regarding these safety instructions, Rohde & Schwarz will be happy to answer them.

Furthermore, it is your responsibility to use the product in an appropriate manner. This product is
designed for use solely in industrial and laboratory environments or in the field and must not be used in
any way that may cause personal injury or property damage. You are responsible if the product is used
for an intention other than its designated purpose or in disregard of the manufacturer's instructions. The
manufacturer shall assume no responsibility for such use of the product.

The product is used for its designated purpose if it is used in accordance with its operating manual and
within its performance limits (see data sheet, documentation, the following safety instructions). Using
the products requires technical skills and knowledge of English. It is therefore essential that the
products be used exclusively by skilled and specialized staff or thoroughly trained personnel with the
required skills. If personal safety gear is required for using Rohde & Schwarz products, this will be
indicated at the appropriate place in the product documentation.

Observe
operating
instructions

Supply
voltage
ON/OFF

Weight
indication for
units >18 kg

Standby
indication

Symbols and safety labels

Danger of
electric
shock

Direct
current
(DC)

Warning!
Hot
surface

PE terminal Ground

Alternating
current (AC)

Direct/alternating
current (DC/AC)

Ground
terminal

Device fully
protected by
double/reinforced
insulation

Attention!
Electrostatic
sensitive
devices

1171.0000.42-02.00 Sheet 1

Safety Instructions

Observing the safety instructions will help prevent personal injury or damage of any kind caused by
dangerous situations. Therefore, carefully read through and adhere to the following safety instructions
before putting the product into operation. It is also absolutely essential to observe the additional safety
instructions on personal safety that appear in other parts of the documentation. In these safety
instructions, the word "product" refers to all merchandise sold and distributed by Rohde & Schwarz,
including instruments, systems and all accessories.

Tags and their meaning

DANGER

WARNING

CAUTION This tag indicates a safety hazard with a low potential of risk for the user

ATTENTION

NOTE

These tags are in accordance with the standard definition for civil applications in the European
Economic Area. Definitions that deviate from the standard definition may also exist. It is therefore
essential to make sure that the tags described here are always used only in connection with the
associated documentation and the associated product. The use of tags in connection with unassociated
products or unassociated documentation can result in misinterpretations and thus contribute to personal
injury or material damage.

This tag indicates a safety hazard with a high potential of risk for the
user that can result in death or serious injuries.

This tag indicates a safety hazard with a medium potential of risk for the
user that can result in death or serious injuries.

that can result in slight or minor injuries.

This tag indicates the possibility of incorrect use that can cause damage
to the product.

This tag indicates a situation where the user should pay special attention
to operating the product but which does not lead to damage.

Basic safety instructions

1. The product may be operated only under
the operating conditions and in the
positions specified by the manufacturer. Its
ventilation must not be obstructed during
operation. Unless otherwise specified, the
following requirements apply to
Rohde & Schwarz products:
prescribed operating position is always with
the housing floor facing down, IP protection
2X, pollution severity 2, overvoltage
category 2, use only in enclosed spaces,
max. operation altitude max. 2000 m.
Unless specified otherwise in the data
sheet, a tolerance of ±10% shall apply to
the nominal voltage and of ±5% to the
nominal frequency.

2. Applicable local or national safety
regulations and rules for the prevention of
accidents must be observed in all work
performed. The product may be opened
only by authorized, specially trained
personnel. Prior to performing any work on
the product or opening the product, the

product must be disconnected from the
supply network. Any adjustments,
replacements of parts, maintenance or
repair must be carried out only by technical
personnel authorized by Rohde & Schwarz.
Only original parts may be used for
replacing parts relevant to safety (e.g.
power switches, power transformers,
fuses). A safety test must always be
performed after parts relevant to safety
have been replaced (visual inspection, PE
conductor test, insulation resistance
measurement, leakage current
measurement, functional test).

3. As with all industrially manufactured goods,
the use of substances that induce an
allergic reaction (allergens, e.g. nickel)
such as aluminum cannot be generally
excluded. If you develop an allergic
reaction (such as a skin rash, frequent
sneezing, red eyes or respiratory
difficulties), consult a physician immediately
to determine the cause.

1171.0000.42-02.00 Sheet 2

Safety Instructions

4. If products/components are mechanically
and/or thermically processed in a manner
that goes beyond their intended use,
hazardous substances (heavy-metal dust
such as lead, beryllium, nickel) may be
released. For this reason, the product may
only be disassembled, e.g. for disposal
purposes, by specially trained personnel.
Improper disassembly may be hazardous to
your health. National waste disposal
regulations must be observed.

5. If handling the product yields hazardous
substances or fuels that must be disposed
of in a special way, e.g. coolants or engine
oils that must be replenished regularly, the
safety instructions of the manufacturer of
the hazardous substances or fuels and the
applicable regional waste disposal
regulations must be observed. Also
observe the relevant safety instructions in
the product documentation.

6. Depending on the function, certain products
such as RF radio equipment can produce
an elevated level of electromagnetic
radiation. Considering that unborn life
requires increased protection, pregnant
women should be protected by appropriate
measures. Persons with pacemakers may
also be endangered by electromagnetic
radiation. The employer is required to
assess workplaces where there is a special
risk of exposure to radiation and, if
necessary, take measures to avert the
danger.

7. Operating the products requires special
training and intense concentration. Make
certain that persons who use the products
are physically, mentally and emotionally fit
enough to handle operating the products;
otherwise injuries or material damage may
occur. It is the responsibility of the
employer to select suitable personnel for
operating the products.

8. Prior to switching on the product, it must be
ensured that the nominal voltage setting on
the product matches the nominal voltage of
the AC supply network. If a different voltage
is to be set, the power fuse of the product
may have to be changed accordingly.

9. In the case of products of safety class I with
movable power cord and connector,
operation is permitted only on sockets with
earthing contact and protective earth
connection.

10. Intentionally breaking the protective earth
connection either in the feed line or in the
product itself is not permitted. Doing so can
result in the danger of an electric shock
from the product. If extension cords or
connector strips are implemented, they
must be checked on a regular basis to
ensure that they are safe to use.

11. If the product has no power switch for
disconnection from the AC supply, the plug
of the connecting cable is regarded as the
disconnecting device. In such cases, it
must be ensured that the power plug is
easily reachable and accessible at all times
(length of connecting cable approx. 2 m).
Functional or electronic switches are not
suitable for providing disconnection from
the AC supply. If products without power
switches are integrated in racks or systems,
a disconnecting device must be provided at
the system level.

12. Never use the product if the power cable is
damaged. By taking appropriate safety
measures and carefully laying the power
cable, ensure that the cable cannot be
damaged and that no one can be hurt by
e.g. tripping over the cable or suffering an
electric shock.

13. The product may be operated only from
TN/TT supply networks fused with max.
16 A.

14. Do not insert the plug into sockets that are
dusty or dirty. Insert the plug firmly and all
the way into the socket. Otherwise this can
result in sparks, fire and/or injuries.

15. Do not overload any sockets, extension
cords or connector strips; doing so can
cause fire or electric shocks.

16. For measurements in circuits with voltages
V

> 30 V, suitable measures (e.g.

rms

appropriate measuring equipment, fusing,
current limiting, electrical separation,
insulation) should be taken to avoid any
hazards.

17. Ensure that the connections with
information technology equipment comply
with IEC 950/EN 60950.

18. Never remove the cover or part of the
housing while you are operating the
product. This will expose circuits and
components and can lead to injuries, fire or
damage to the product.

1171.0000.42-02.00 Sheet 3

Safety Instructions

19. If a product is to be permanently installed,
the connection between the PE terminal on
site and the product's PE conductor must
be made first before any other connection
is made. The product may be installed and
connected only by a skilled electrician.

20. For permanently installed equipment
without built-in fuses, circuit breakers or
similar protective devices, the supply circuit
must be fused in such a way that suitable
protection is provided for users and
products.

21. Do not insert any objects into the openings
in the housing that are not designed for this
purpose. Never pour any liquids onto or into
the housing. This can cause short circuits
inside the product and/or electric shocks,
fire or injuries.

22. Use suitable overvoltage protection to
ensure that no overvoltage (such as that
caused by a thunderstorm) can reach the
product. Otherwise the operating personnel
will be endangered by electric shocks.

23. Rohde & Schwarz products are not
protected against penetration of water,
unless otherwise specified (see also safety
instruction 1.). If this is not taken into
account, there exists the danger of electric
shock or damage to the product, which can
also lead to personal injury.

24. Never use the product under conditions in
which condensation has formed or can form
in or on the product, e.g. if the product was
moved from a cold to a warm environment.

matching Rohde & Schwarz type (see
spare parts list). Batteries and storage
batteries are hazardous waste. Dispose of
them only in specially marked containers.
Observe local regulations regarding waste
disposal. Do not short-circuit batteries or
storage batteries.

28. Please be aware that in the event of a fire,
toxic substances (gases, liquids etc.) that
may be hazardous to your health may
escape from the product.

29. Please be aware of the weight of the
product. Be careful when moving it;
otherwise you may injure your back or other
parts of your body.

30. Do not place the product on surfaces,
vehicles, cabinets or tables that for reasons
of weight or stability are unsuitable for this
purpose. Always follow the manufacturer's
installation instructions when installing the
product and fastening it to objects or
structures (e.g. walls and shelves).

31. Handles on the products are designed
exclusively for personnel to hold or carry
the product. It is therefore not permissible
to use handles for fastening the product to
or on means of transport such as cranes,
fork lifts, wagons, etc. The user is
responsible for securely fastening the
products to or on the means of transport
and for observing the safety regulations of
the manufacturer of the means of transport.
Noncompliance can result in personal injury
or material damage.

25. Do not close any slots or openings on the
product, since they are necessary for
ventilation and prevent the product from
overheating. Do not place the product on
soft surfaces such as sofas or rugs or
inside a closed housing, unless this is well
ventilated.

26. Do not place the product on heat­generating devices such as radiators or fan
heaters. The temperature of the
environment must not exceed the maximum
temperature specified in the data sheet.

27. Batteries and storage batteries must not be
exposed to high temperatures or fire. Keep
batteries and storage batteries away from
children. If batteries or storage batteries are
improperly replaced, this can cause an
explosion (warning: lithium cells). Replace
the battery or storage battery only with the

1171.0000.42-02.00 Sheet 4

32. If you use the product in a vehicle, it is the
sole responsibility of the driver to drive the
vehicle safely. Adequately secure the
product in the vehicle to prevent injuries or
other damage in the event of an accident.
Never use the product in a moving vehicle if
doing so could distract the driver of the
vehicle. The driver is always responsible for
the safety of the vehicle; the manufacturer
assumes no responsibility for accidents or
collisions.

33. If a laser product (e.g. a CD/DVD drive) is
integrated in a Rohde & Schwarz product,
do not use any other settings or functions
than those described in the documentation.
Otherwise this may be hazardous to your
health, since the laser beam can cause
irreversible damage to your eyes. Never try
to take such products apart, and never look
into the laser beam.

Por favor lea imprescindiblemente antes de
la primera puesta en funcionamiento las
siguientes informaciones de seguridad

Informaciones de seguridad

Es el principio de Rohde & Schwarz de tener a sus productos siempre al día con los estandards de
seguridad y de ofrecer a sus clientes el máximo grado de seguridad. Nuestros productos y todos los
equipos adicionales son siempre fabricados y examinados según las normas de seguridad vigentes.
Nuestra sección de gestión de la seguridad de calidad controla constantemente que sean cumplidas
estas normas. Este producto ha sido fabricado y examinado según el comprobante de conformidad
adjunto según las normas de la CE y ha salido de nuestra planta en estado impecable según los
estandards técnicos de seguridad. Para poder preservar este estado y garantizar un funcionamiento
libre de peligros, deberá el usuario atenerse a todas las informaciones, informaciones de seguridad y
notas de alerta. Rohde&Schwarz está siempre a su disposición en caso de que tengan preguntas
referentes a estas informaciones de seguridad.

Además queda en la responsabilidad del usuario utilizar el producto en la forma debida. Este producto
solamente fue elaborado para ser utilizado en la indústria y el laboratorio o para fines de campo y de
ninguna manera deberá ser utilizado de modo que alguna persona/cosa pueda ser dañada. El uso del
producto fuera de sus fines definidos o despreciando las informaciones de seguridad del fabricante
queda en la responsabilidad del usuario. El fabricante no se hace en ninguna forma responsable de
consecuencias a causa del maluso del producto.

Se parte del uso correcto del producto para los fines definidos si el producto es utilizado dentro de las
instrucciones del correspondiente manual del uso y dentro del margen de rendimiento definido (ver
hoja de datos, documentación, informaciones de seguridad que siguen). El uso de los productos hace
necesarios conocimientos profundos y el conocimiento del idioma inglés. Por eso se deberá tener en
cuenta de exclusivamente autorizar para el uso de los productos a personas péritas o debidamente
minuciosamente instruidas con los conocimientos citados. Si fuera necesaria indumentaria de
seguridad para el uso de productos de R&S, encontrará la información debida en la documentación del
producto en el capítulo correspondiente.

Símbolos y definiciones de seguridad

Ver manual
de
instrucciones
del uso

Informaciones
para
maquinaria
con uns peso
de > 18kg

Peligro de
golpe de
corriente

¡Advertencia!
Superficie
caliente

Conexión a
conductor
protector

Conexión
a tierra

Conexión
a masa
conductora

¡Cuidado!
Elementos de
construción
con peligro de
carga
electroestática

El aparato está
protegido en su
totalidad por un
aislamiento de
doble refuerzo

potencia EN
MARCHA/PARADA

Indicación
Stand-by

Corriente
continua
DC

Corriente
alterna AC

Corriente
continua/alterna
DC/AC

1171.0000.42-02.00 página 1

Informaciones de seguridad

Tener en cuenta las informaciones de seguridad sirve para tratar de evitar daños y peligros de toda
clase. Es necesario de que se lean las siguientes informaciones de seguridad concienzudamente y se
tengan en cuenta debidamente antes de la puesta en funcionamiento del producto. También deberán
ser tenidas en cuenta las informaciones para la protección de personas que encontrarán en otro
capítulo de esta documentación y que también son obligatorias de seguir. En las informaciones de
seguridad actuales hemos juntado todos los objetos vendidos por Rohde&Schwarz bajo la
denominación de „producto“, entre ellos también aparatos, instalaciones así como toda clase de
accesorios.

Palabras de señal y su significado

PELIGRO Indica un punto de peligro con gran potencial de riesgo para el

ususario.Punto de peligro que puede llevar hasta la muerte o graves
heridas.

ADVERTENCIA Indica un punto de peligro con un protencial de riesgo mediano para el

usuario. Punto de peligro que puede llevar hasta la muerte o graves
heridas .

ATENCIÓN Indica un punto de peligro con un protencial de riesgo pequeño para el

usuario. Punto de peligro que puede llevar hasta heridas leves o
pequeñas

CUIDADO Indica la posibilidad de utilizar mal el producto y a consecuencia

dañarlo.

INFORMACIÓN Indica una situación en la que deberían seguirse las instrucciones en el

uso del producto, pero que no consecuentemente deben de llevar a un
daño del mismo.

Las palabras de señal corresponden a la definición habitual para aplicaciones civiles en el ámbito de la
comunidad económica europea. Pueden existir definiciones diferentes a esta definición. Por eso se
debera tener en cuenta que las palabras de señal aquí descritas sean utilizadas siempre solamente en
combinación con la correspondiente documentación y solamente en combinación con el producto
correspondiente. La utilización de las palabras de señal en combinación con productos o
documentaciones que no les correspondan puede llevar a malinterpretaciones y tener por
consecuencia daños en personas u objetos.

Informaciones de seguridad elementales

1. El producto solamente debe ser utilizado
según lo indicado por el fabricante referente
a la situación y posición de funcionamiento
sin que se obstruya la ventilación. Si no se
convino de otra manera, es para los
productos R&S válido lo que sigue:
como posición de funcionamiento se define
principialmente la posición con el suelo de la
caja para abajo , modo de protección IP 2X,
grado de suciedad 2, categoría de
sobrecarga eléctrica 2, utilizar solamente en
estancias interiores, utilización hasta 2000 m
sobre el nivel del mar.
A menos que se especifique otra cosa en la
hoja de datos, se aplicará una tolerancia de
±10% sobre el voltaje nominal y de ±5%
sobre la frecuencia nominal.

2. En todos los trabajos deberán ser tenidas en
cuenta las normas locales de seguridad de
trabajo y de prevención de accidentes. El
producto solamente debe de ser abierto por
personal périto autorizado. Antes de efectuar
trabajos en el producto o abrirlo deberá este
ser desconectado de la corriente. El ajuste,
el cambio de partes, la manutención y la
reparación deberán ser solamente
efectuadas por electricistas autorizados por
R&S. Si se reponen partes con importancia
para los aspectos de seguridad (por ejemplo
el enchufe, los transformadores o los
fusibles), solamente podrán ser sustituidos
por partes originales. Despues de cada
recambio de partes elementales para la
seguridad deberá ser efectuado un control de

1171.0000.42-02.00 página 2

Informaciones de seguridad

seguridad (control a primera vista, control de
conductor protector, medición de resistencia
de aislamiento, medición de medición de la
corriente conductora, control de
funcionamiento).

3. Como en todo producto de fabricación
industrial no puede ser excluido en general
de que se produzcan al usarlo elementos
que puedan generar alergias, los llamados
elementos alergénicos (por ejemplo el
níquel). Si se producieran en el trato con
productos R&S reacciones alérgicas, como
por ejemplo urticaria, estornudos frecuentes,
irritación de la conjuntiva o dificultades al
respirar, se deberá consultar inmediatamente
a un médico para averigurar los motivos de
estas reacciones.

4. Si productos / elementos de construcción son
tratados fuera del funcionamiento definido de
forma mecánica o térmica, pueden generarse
elementos peligrosos (polvos de sustancia
de metales pesados como por ejemplo
plomo, berilio, níquel). La partición elemental
del producto, como por ejemplo sucede en el
tratamiento de materias residuales, debe de
ser efectuada solamente por personal
especializado para estos tratamientos. La
partición elemental efectuada
inadecuadamente puede generar daños para
la salud. Se deben tener en cuenta las
directivas nacionales referentes al
tratamiento de materias residuales.

5. En el caso de que se produjeran agentes de
peligro o combustibles en la aplicación del
producto que debieran de ser transferidos a
un tratamiento de materias residuales, como
por ejemplo agentes refrigerantes que deben
ser repuestos en periodos definidos, o
aceites para motores, deberan ser tenidas en
cuenta las prescripciones de seguridad del
fabricante de estos agentes de peligro o
combustibles y las regulaciones regionales
para el tratamiento de materias residuales.
Cuiden también de tener en cuenta en caso
dado las prescripciones de seguridad
especiales en la descripción del producto.

6. Ciertos productos, como por ejemplo las
instalaciones de radiación HF, pueden a
causa de su función natural, emitir una
radiación electromagnética aumentada. En
vista a la protección de la vida en desarrollo
deberían ser protegidas personas
embarazadas debidamente. También las
personas con un bypass pueden correr

peligro a causa de la radiación
electromagnética. El empresario está
comprometido a valorar y señalar areas de
trabajo en las que se corra un riesgo de
exposición a radiaciones aumentadas de
riesgo aumentado para evitar riesgos.

7. La utilización de los productos requiere
instrucciones especiales y una alta
concentración en el manejo. Debe de
ponerse por seguro de que las personas que
manejen los productos estén a la altura de
los requerimientos necesarios referente a
sus aptitudes físicas, psíquicas y
emocionales, ya que de otra manera no se
pueden excluir lesiones o daños de objetos.
El empresario lleva la responsabilidad de
seleccionar el personal usuario apto para el
manejo de los productos.

8. Antes de la puesta en marcha del producto
se deberá tener por seguro de que la tensión
preseleccionada en el producto equivalga a
la del la red de distribución. Si es necesario
cambiar la preselección de la tensión
también se deberán en caso dabo cambiar
los fusibles correspondientes del prodcuto.

9. Productos de la clase de seguridad I con
alimentación móvil y enchufe individual de
producto solamente deberán ser conectados
para el funcionamiento a tomas de corriente
de contacto de seguridad y con conductor
protector conectado.

10. Queda prohibida toda clase de interrupción
intencionada del conductor protector, tanto
en la toma de corriente como en el mismo
producto ya que puede tener como
consecuencia el peligro de golpe de corriente
por el producto. Si se utilizaran cables o
enchufes de extensión se deberá poner al
seguro, que es controlado su estado técnico
de seguridad.

11. Si el producto no está equipado con un
interruptor para desconectarlo de la red, se
deberá considerar el enchufe del cable de
distribución como interruptor. En estos casos
deberá asegurar de que el enchufe sea de
fácil acceso y nabejo (medida del cable de
distribución aproximadamente 2 m). Los
interruptores de función o electrónicos no
son aptos para el corte de la red eléctrica. Si
los productos sin interruptor están integrados
en construciones o instalaciones, se deberá
instalar el interruptor al nivel de la
instalación.

1171.0000.42-02.00 página 3

Informaciones de seguridad

12. No utilice nunca el producto si está dañado el
cable eléctrico. Asegure a través de las
medidas de protección y de instalación
adecuadas de que el cable de eléctrico no
pueda ser dañado o de que nadie pueda ser
dañado por él, por ejemplo al tropezar o por
un golpe de corriente.

13. Solamente está permitido el funcionamiento
en redes de distribución TN/TT aseguradas
con fusibles de como máximo 16 A.

14. Nunca conecte el enchufe en tomas de
corriente sucias o llenas de polvo. Introduzca
el enchufe por completo y fuertemente en la
toma de corriente. Si no tiene en
consideración estas indicaciones se arriesga
a que se originen chispas, fuego y/o heridas.

15. No sobrecargue las tomas de corriente, los
cables de extensión o los enchufes de
extensión ya que esto pudiera causar fuego
o golpes de corriente.

16. En las mediciones en circuitos de corriente
con una tensión de entrada de Ueff > 30 V se
deberá tomar las precauciones debidas para
impedir cualquier peligro (por ejemplo
medios de medición adecuados, seguros,
limitación de tensión, corte protector,
aislamiento etc.).

17. En caso de conexión con aparatos de la
técnica informática se deberá tener en
cuenta que estos cumplan los requisitos de
la EC950/EN60950.

18. Nunca abra la tapa o parte de ella si el
producto está en funcionamiento. Esto pone
a descubierto los cables y componentes
eléctricos y puede causar heridas, fuego o
daños en el producto.

19. Si un producto es instalado fijamente en un
lugar, se deberá primero conectar el
conductor protector fijo con el conductor
protector del aparato antes de hacer
cualquier otra conexión. La instalación y la
conexión deberán ser efecutadas por un
electricista especializado.

20. En caso de que los productos que son
instalados fijamente en un lugar sean sin
protector implementado, autointerruptor o
similares objetos de protección, deberá la
toma de corriente estar protegida de manera
que los productos o los usuarios estén
suficientemente protegidos.

21. Por favor, no introduzca ningún objeto que
no esté destinado a ello en los orificios de la
caja del aparato. No vierta nunca ninguna
clase de líquidos sobre o en la caja. Esto
puede producir corto circuitos en el producto
y/o puede causar golpes de corriente, fuego
o heridas.

22. Asegúrese con la protección adecuada de
que no pueda originarse en el producto una
sobrecarga por ejemplo a causa de una
tormenta. Si no se verá el personal que lo
utilice expuesto al peligro de un golpe de
corriente.

23. Los productos R&S no están protegidos
contra el agua si no es que exista otra
indicación, ver también punto 1. Si no se
tiene en cuenta esto se arriesga el peligro de
golpe de corriente o de daños en el producto
lo cual también puede llevar al peligro de
personas.

24. No utilice el producto bajo condiciones en las
que pueda producirse y se hayan producido
líquidos de condensación en o dentro del
producto como por ejemplo cuando se
desplaza el producto de un lugar frío a un
lugar caliente.

25. Por favor no cierre ninguna ranura u orificio
del producto, ya que estas son necesarias
para la ventilación e impiden que el producto
se caliente demasiado. No pongan el
producto encima de materiales blandos como
por ejemplo sofás o alfombras o dentro de
una caja cerrada, si esta no está
suficientemente ventilada.

26. No ponga el producto sobre aparatos que
produzcan calor, como por ejemplo
radiadores o calentadores. La temperatura
ambiental no debe superar la temperatura
máxima especificada en la hoja de datos.

1171.0000.42-02.00 página 4

Informaciones de seguridad

27. Baterías y acumuladores no deben de ser
expuestos a temperaturas altas o al fuego.
Guardar baterías y acumuladores fuera del
alcance de los niños. Si las baterías o los
acumuladores no son cambiados con la
debida atención existirá peligro de explosión
(atención celulas de Litio). Cambiar las
baterías o los acumuladores solamente por
los del tipo R&S correspondiente (ver lista de
piezas de recambio). Baterías y
acumuladores son deshechos problemáticos.
Por favor tirenlos en los recipientes
especiales para este fín. Por favor tengan en
cuenta las prescripciones nacionales de cada
país referente al tratamiento de deshechos.
Nunca sometan las baterías o acumuladores
a un corto circuito.

28. Tengan en consideración de que en caso de
un incendio pueden escaparse gases tóxicos
del producto, que pueden causar daños a la
salud.

29. Por favor tengan en cuenta que en caso de
un incendio pueden desprenderse del
producto agentes venenosos (gases, líquidos
etc.) que pueden generar daños a la salud.

30. No sitúe el producto encima de superficies,
vehículos, estantes o mesas, que por sus
características de peso o de estabilidad no
sean aptas para él. Siga siempre las
instrucciones de instalación del fabricante
cuando instale y asegure el producto en
objetos o estructuras (por ejemplo paredes y
estantes).

31. Las asas instaladas en los productos sirven
solamente de ayuda para el manejo que
solamente está previsto para personas. Por
eso no está permitido utilizar las asas para la
sujecion en o sobre medios de transporte
como por ejemplo grúas, carretillas
elevadoras de horquilla, carros etc. El
usuario es responsable de que los productos
sean sujetados de forma segura a los medios
de transporte y de que las prescripciones de
seguridad del fabricante de los medios de
transporte sean tenidas en cuenta. En caso
de que no se tengan en cuenta pueden
causarse daños en personas y objetos.

32. Si llega a utilizar el producto dentro de un
vehículo, queda en la responsabilidad
absoluta del conductor que conducir el
vehículo de manera segura. Asegure el
producto dentro del vehículo debidamente
para evitar en caso de un accidente las
lesiones u otra clase de daños. No utilice
nunca el producto dentro de un vehículo en
movimiento si esto pudiera distraer al
conductor. Siempre queda en la
responsabilidad absoluta del conductor la
seguridad del vehículo y el fabricante no
asumirá ninguna clase de responsabilidad
por accidentes o colisiones.

33. Dado el caso de que esté integrado un
producto de laser en un producto R&S (por
ejemplo CD/DVD-ROM) no utilice otras
instalaciones o funciones que las descritas
en la documentación. De otra manera pondrá
en peligro su salud, ya que el rayo laser
puede dañar irreversiblemente sus ojos.
Nunca trate de descomponer estos
productos. Nunca mire dentro del rayo laser.

1171.0000.42-02.00 página 5

EC Certificate of Conformity

Certificate No.: 98069

This is to certify that:

Equipment type Order No. Designation

CTS50 1094.0006.50 Digital Radio Tester

complies with the provisions of the Directive of the Council of the European Union on the
approximation of the laws of the Member Stat es

- relating to electrical equipment for use within defined voltage lim its
(73/23/EEC revised by 93/68/EEC)

- relating to electromagnetic compatibility
(89/336/EEC revised by 91/263/EEC, 92/31/EEC, 93/68/ EEC)

Conformity is proven by compliance with the following standards:
EN61010-1 : 1993 + A2 : 1995

EN50081-1 : 1992
EN50082-2 : 1995

Affixing the EC confor m it y mark as from 1998

ROHDE & SCHWARZ GmbH & Co. KG
Mühldorfstr. 15, D-81671 München

Munich, 1999-02-24 Central Quality Management FS-QZ / Becker

1094.0006.50 CE E-2

Certificate No.: 960210

This is to certify that:

Equipment type Order No. Designation

CTS55 1094.0006.55 Digital Radio Tester
CTS-B1 1079.0809.02 OCXO Reference Oscillato r

CTS-B7 1079.2101.02 Module Test and Output

EC Certificate of Conformity

complies with the provisions of the Directive of the Council of the European Union on the
approximation of the laws of the Member States

- relating to electrical equipment for use within defined voltage lim it s
(73/23/EEC revised by 93/68/EEC)

- relating to electromagnetic compatibility
(89/336/EEC revised by 91/263/EEC, 92/31/EEC, 93/68/ EEC)

Conformity is proven by compliance with the following standards:
EN61010-1 : 1993 + A2 : 1995

EN50081-1 : 1992
EN50082-2 : 1995

Affixing the EC confor m it y mark as from 1996

ROHDE & SCHWARZ GmbH & Co. KG
Mühldorfstr. 15, D-81671 München

Munich, 1999-02-24 Central Quality Management FS-QZ / Becker

1094.0006.55 CE E-4

Supplement to Data Sheet CTS

(PD757.2509.22)

Specifications supplement:

AM modulated signal at RF OUT2 GSM connector (only with CTS-K7)

Level range
(depending on modulation depth)

GSM900 band..............................................-20 to -30 dBm

GSM1800/1900 band...................................-23 to -33 dBm

Modulation depth at

-23 dBm

1)

/ -26 dBm 2)....................................0 to 90 % AM

Resolution......................................................1 %

Modulation frequency.....................................1 kHz

Setting error at

-23 dBm

1)

/ -26 dBm

2)

and 83 % AM..................................................<10 % of reading

AM distortion at

-23 dBm

1)

/ -26 dBm

2)

and 83 % AM..................................................< 5 %

________________

1) GSM900 band

2) GSM1800/1900-band

PD757.2509.22 A E-2

Problems with GSM?

If you would like to enhance your knowledge about GSM and DCS1800, then there is no better way than
at a ROHDE & SCHWARZ seminar. The program of sem inars published every six m onths include the
following topics dealt with at the Munich training center:

• GSM/PCN - Digital mobile phoning

(Two-day seminar about GSM basics)

• GSM/PCN measurements on mobile stations

(One-day seminar with emphasis on RF measurements)

• Digital modulation - Modern methods in radiotelecommunications

(Two-day seminar all about RF modulation)

Further information can be found in our seminar program which is obtainable from your ROHDE &
SCHWARZ sales office or directly from the training center. Tel. [phone].

Would you like to know more about GSM? Here ar e some ti ps!

Gabler, Krammling
SIGNALISIERUNGS- UND MESSVERFAHREN IM MODERNEN MOBILFUNK
Publisher: Franzis-Verlag 1993
ISBN 3-7723-4951-X

H. Preibisch
GSM-Mobilfunkübertragungstechnik
Schiele & Schön, Berlin, 1994
ISBN 3-7949-0577-6

M. Mouly, M.B. Poutet
The GSM System for Mobile Communications
France 1992
ISBN 2-9507190-0-7

1007.8832 E-2

CTS55 Introduction

1 Introduction

The tester CT S is a value- f or -money instrument for autom atic and f as t f unc tion tes ts, as well as detailed
service testing on digital mobiles. Two autom atic and fast function tes ts are implemented in CT S, one
being called Quicktest, the other being called Autotest. The detailed ser vice test is called the Manual
Test of the CTS.

1.1 Application for the Autotest

1.1.1 Overview

The main application of the Autotest is to check the operation of a m obile station upon handing it out to
the customer, e.g. upon sale (to give enhanced customer confidence, by demonstrating proper
functioning of equipment in the presence of the customer), before or after a repair or in the event a
complaint is received. In the latter case, the customer's complaint can be verified im m ediately, avoiding
unnecessary return of the mobile phone to a central service station, and thus saving time and expense.

With the CTS, optimum customer support can be provided even by small service shops and sales
chains that have no highly-qualified service staff of their own but rely on an external service centre.

1.1.2 Test Functions in the Autotest

• location update

• set-up of speech link (call from network and from mobile)

• close-down of speech link (from network and from mobile)

• echo test (a message spoken into the mobile is sent back by the tester with a delay)

• tests and measurements on customer-defined GSM channels. It can be configured to carry out tests

and measurements on one, two or three channels.

• mobile receiver sensitivity (RxLev, RxQual)

• measurement of average output power of mobile

• measurement of the power ramp and phase frequency error

• measurement of the Bit Error Rate

• change of power level on existing speech link

• change of channel on existing speech link

• Test of the mobile's keypad (by dialling a phone number)

• Testing of one or two GSM bands within a single test sequence.

• Handover between two different GSM bands.

1094.0006.55 1.1 E-6

Introduction CTS55

1.2 Quicktest

Quicktest and Autotest shar e the sam e application range. However, there is a differenc e as regards the
exhaustiveness of the test. While exhaustive tests are carried out in Autotest on one, two or three
channels Quicktest consists of a fixed sequence comprising:

• location update

• set-up of speech link (call from network)

• echo test

• close-down of speech link

1.3 Application for the Manual Test

This part of the CTS is designed for s ervice testing and other situations where the user must decide
which step has to be per formed next. For example which s ignalling sequence or which measurement
(power ramp, phase frequency or bit error rate).

1.4 Application for the Module Test (Option CTS-B7)

Option "Module Test" allows to test modules of mobile phones. A RF generator emits CW or bursted
signals, with modulation conforming to GSM or just a frequency offset.

Input signals can be analyzed with menu "Burst Analysis" and "IQ Spectrum" (narrowband spectrum
monitor).

1.5 Remote Control (Option CTS-K6)

Option "Remote Control" allows the CTS to be controlled via an RS232 interface.

1094.0006.55 1.2 E-6

CTS55 Putting into Operation

2 Preparation for Use

¾ When unpacking the instrument, don't forget the items and accessories which are included.

¾ When transporting the instrument in future it is strongly recommended that the protective caps

included in the shipping box for protection of the front and rear panel are used. This serves to
prevent damage to the protruding items on the front and rear panels.

Important note:
A rechargeable battery is installed in the CTS which allows storage of important instrument parameters
when the instrument is switched off. This battery is automatically charged during operation of the
instrument. For the battery to be sufficiently charged, the CTS should not remain switched off for longer
than three months.

The instrument should be switched on for at least 24 hours upon its first use.

1094.0006.55 2.1 E-11

Putting into Operation CTS55

2.1 Explanation of Front and Rear View

This page shows the front and rear view of the instrument, with short explanations on the controls and
connectors.

TFT Display

DIGITAL RADIO TESTE R CTS 55

RF OUT 2 GSM

High level output
for GSM

RF input / output for direct
cable connection and for
connection of the mobile
via antenna coupler

50

>

RF IN / OU T GSM

50

>

CAUTION

INPUT POWER LIMITED

The input power may not exceed +45 dBm in pulsed mode (1:8)
and +39 dBm (8 W) in CW mode!

Instrument with input voltage selector

Fan of power supply unit
(controlled)

100 ... 120 V / 135 VA
200 ... 240 V / 160 VA
50 ... 60 Hz

CE

.

Service connector
(e. g. for ext. monitor)

MONITOR

1094.0006.55

Softkeys for
menu control

MENU UP

MADE IN GERMANY

Hardkey to
return to the
previous menu
level

0

Power switch on/off

Fan
(uncont rolled)

RF OUT2 (Option CTS-B7)

Keyboard connector
(for an external
keyboard)

Printer connector for test report

Voltage selector switch

AC supply connector
for voltage/current supply

RS 232

PRINT ER

RS232 interface
(e. g. for software update,
servicing, remote control)

CE

KEYBOARD

1094.0006.55 2.2 E-11

CTS55 Putting into Operation

y

Instrument with wide-range voltage input

Fan of power supply unit
(controlled)

Service connector
(e. g. for ext. monitor)

100 ... 240 V / 160 VA
50 ... 60 Hz

AC supply connector
for voltage/current suppl

CE

MONITOR

RS 232

PRINTER

RS232 interface
(e. g. for software update,

CE

KEYBOARD

0

Power switch on/off

Fan
(uncont rolled)

RF OUT2 (Option CTS-B7)

Keyboard connector
(for an external
keyboard)

Printer connector for test report

1094.0006.55 2.3 E-11

Putting into Operation CTS55

2.2 Commissioning

2.2.1 Setting up the Instrument

For bench measurements, it is recommended that the fold out feet at the bottom of the instrument are
used as this improves the viewing angle of the screen.

For convenient operation of the instrument note the following:

• Do not cover the ventilation openings!

• Ambient temperature +5 to +45 °C.

• Avoid moisture and condensation, if it occurs however, the instrument must be thoroughly dried

before switching on.

2.2.2 Connecting the Instrument to the AC Supply

¾ Check the position of the voltage selector and set it to the local AC supply voltage if necessary.

¾ Plug the supplied power cable into the rear power connector and connect the CTS to the power

supply.

Instrument with input voltage selector

100 ... 120 V / 135 VA
200 ... 240 V / 160 VA
50 ... 60 Hz

Instrument with wide-range voltage input

100 ... 240 V / 160 VA
50 ... 60 Hz

1094.0006.55 2.4 E-11

CTS55 Putting into Operation

2.2.3 Ensuring Electromagnetic Compliance (EMC)

In order to avoid electromagnetic interference, the instrument may only be operated with all covers in
place as they form part of the shielding for the instrument. Only appropriate shielded signal and control
cables (e.g. RF connecting cables) should be used.

2.2.4 Switching on the Instrument

The CTS is switched on by means of the power switch at the rear.

2.2.5 Options List

After the instrument is switched on a start up screen is displayed while the instruments loads stored
parameters and checks which options are installed. After a short time the options screen is displayed
(see below). It is advisable to check the options after powering up the instrument for the first time to
ensure that the purchased options are installed.

Available Options Menu

If you want to use additional available options, please contact your local Rohde & Schwarz sales
representative.

2.2.6 OCXO Reference Oscillator (Option CTS-B1)

If your instrument is equipped with this option, be aware that an OCXO needs approximately 15
minutes to warm up after switching on the instrument to achieve full precision.

1094.0006.55 2.5 E-11

Putting into Operation CTS55

2.2.7 Connecting an External Keyboard

The equipment can also be operated with an external keyboard which is to be connected to the rear­panel PS-2 connector KEYBOARD.

• Function keys F1 to F6 are assigned to the 6 softkeys next to the display. F1 corresponds to the

uppermost softkey.

• The ESC key is assigned to softkey MENU UP.

• Alphanumerical characters can be directly entered and edited.

2.2.8 Connecting an External Monitor

For servicing an external monitor can be connected to 15-contact VGA connector MONITOR.
Switching from TFT display to monitor is described in section 1.4.2 of the service manual.

1094.0006.55 2.6 E-11

CTS55 Getting Started With Autotest

3 Getting Started With Autotest

3.1 Overview

In Autotest mode the CTS f or digital mobiles is easy and convenient to operate thanks to its c lear-cut
menu structure.

If this is your f irs t enc ounter with CTS in Autotest mode, this c hapter will give you a quick survey of tests
performed on m obile stations. You will be guided step by step through the Autotest test sequence for
mobile stations.

Each step is provided with reference num bers, e.g. circles with a number () which relates to further
information on the facing page.

The layout and the contents of this chapter are tailored to application requirements and provide
information for both the CT S and the GSM 850, GSM (GSM 900), PCN (DCS 1800, GSM 1800) and
PCS (DCS 1900, GSM 1900) networks.

The autotest comprises a configurable sequence of tests which is tailored to determine whether a
mobile functions or not. Any autotest step can be included or excluded from the Autotest sequence in
the Config-Configure Autotest menu.

Config-Autotest menu

The tests are:

• Call to the mobile (from the CTS),

• Echo test,

• Call release by the mobile,

• Call from the mobile (to the CTS),

• Power measurements on the first user defined channel,

• Sensitivity measurements on the first user defined channel,

• Power ramp and phase frequency measurements on the first user defined channel,

• Bit Error Rate (BER) measurements on the first user defined channel,

• Power measurements on the second user defined channel,

• Sensitivity measurements on the second user defined channel,

• Power ramp and phase frequency measurements on the second user defined channel,

• Bit Error Rate (BER) measurements on the second user defined channel,

• Network release.

1094.0006.55 3.1 E-7

Getting Started With Autotest CTS55

When a two band autotes t sequence is perfor med, two fur ther autotest steps m ay be attempted. Thes e
two steps are determined by examining the Dual Band capability of the instrum ent. If the instrument is
configured for Dual Band handover, then the following two steps apply.

The „Handover To“ st ep is only perform ed in the star ting network, where the loc ation update occur s and
the „Handover From“ step is only performed after testing has been completed in the handover band.

• Handover To the new band

• Handover From the new band

The Autotest can be c arried out on one, two or three channels . In the introduction it is assum ed that the
test will be carried out on two channels ( mode on delivery). The num ber of channels can be c hanged in
the Config-Autotest menu. It is also as sumed that the wide tolerances are used (see also the Config­Autotest menu).

Within this s equence there are several channel changes, which means that channel changes are also
tested.

To become fam iliar with CTS in Autotes t mode tr y out the functions described imm ediately using a CTS
and a mobile station. The instructions and information given in this chapter are based on the assumption
that the mobile is connected to the tester via a cable.

For further inform ation on the individual menus and keys, refer to the detailed description of the test
sequence in chapter 4 and to the menu descriptions in chapter 9.

Details of the test set-up and the use of antenna couplers are in chapter 8.

Important notes:

• In order to exclude unpredictable circums tances that may arise due to the use of a network SIM card

(e.g. the SIM card prohibits the registration (Loc ation Update) on the network simulated by CTS or it
prohibits the signalling for the bit error tes t), it is strongly recommended that an R&S GSM test SIM
card (part CRT-Z2) is used.

• The GSM850, GSM, PCN and PCS networks are c ellular networks. The area to be covered by the

network is divided up into honeycomb-shaped cells in the ideal case. T he graphics on the front panel
of the CTS indicates the network’s cellular structure.

Each cell accom modates a base station transm itting the control information on a defined channel.
The CTS is simulating the radio network, i.e. the base station, so that a control channel is
transmitted. If the CTS is in the area of a cell make s ure that the control channel of the CT S differs
from that of the cell. In the c ase where the CTS uses the sam e channel as the base station of the
cell, the mobile phone m ay try to register with the cell or the Location Update with the CTS may be
disturbed.

With the CT S in autotest or quic k test m ode the contr ol channel corresponds to the 1st channel set in
the configuration.

• Special attention is required when using an antenna coupler (see chapter 8).

1094.0006.55 3.2 E-7

CTS55 Getting Started With Autotest

1094.0006.55 3.3 E-7

Getting Started With Autotest CTS55

3.2 Test of Mobile

.

MENU UP

MADE IN GERMANY

3

2

GHI1ABC

DEF

564

9

7

8

XYZ

STU

ÜVW

.-0

M

SCRCL

RF OUT 2 GSM

RF IN / OUT GSM

INPUT POWER LIMITED

DIGITAL RADIO TESTER CTS 55 1094.0006.55

50



50



CAUTION

Home Menu

---------------------------------------------------------------------------------

Cheque card format

GSM
TEST SIM

CRT-Z2 1039.9005.02

Plug-In-Format

3

1

2

G

HI

ABC

DE

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5

64

7

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XY

Z

STU

ÜVW

.-0

SCRC

L

Step 1

Connect the N socket RF IN/OUT
of CTS with antenna connector of
mobile. 

Make sure that the mobile is
provided with the required supply
voltage (charged battery or power
supply unit). 

After the CTS is switched on the

Home Menu shown opposite
appears after a f ew seconds . T he
instrument is now ready for
testing. Use the "Test Mode" key
to toggle between the Manual
Test, Autotest, Quicktest and
Module Test modes (select
"Autotest").

Press "Start" to go to the Main
Menu of the Autotest. With the
"Net Type" key the network type
can be selected and with the
"Config" key the configuration
menus can be reached. 

--------------------------------------------

Step 2

Insert test SIM card of the right
format into the mobile. , 

Note:
Network SIM cards prohibit
measurement of the bit error rate.
The Autotest can therefore only be

M

carried out fully if a test SIM card
is used.

1094.0006.55 3.4 E-7

CTS55 Getting Started With Autotest

Explanations:

 RF connection to mobile

For the RF connection to the mobile st ation, a high-grade cable should be used with an attenuation
ideally below 0.5 dB per meter. Hand held mobiles can be connec ted using the car installation set
offered by suppliers of mobiles. The following description of "G etting Started" assumes a good RF
connection so that compensation f or external attenuation is not necess ary. The "Coupler" key in the
Main Menu of the Autotest has to be set to off.

 Power supply of mobile

If the mobile is supplied f rom an exter nal power supply unit, make sure that this unit can provide the
required peak cur rent. Digital m obile phones gener ate pulsed signals at RF and thus f requently have
a pulsed current drain. Problems may arise if power supplies are used that cannot provide such
currents at constant voltage.

 Test Mode and NetType keys

The remainder of this chapter assum es that the "T est Mode" was set to Autotest and the "Net Type"
to GSM. In addition, it is assumed in this chapter that the Autotest is carried out on two channels.

 SIM card

GSM specifications define two formats of SIM card: cheque car d format or a considerably smaller
format, the 15 x 20 mm plug-in SIM card. A mobile must have a SIM card inserted to be able to make
a call. For tests on mobiles perf orm ed with CTS, the test SIM c ard from Rohde & Schwarz should be
used.

 Test SIM card

The Rohde & Schwarz test SIM card can be ordered as an accessory unit under the designation
CRT-Z2 (Order No. 1039.9005.02). This card has cheque card f ormat but can easily be exchanged
for a plug-in card.

1094.0006.55 3.5 E-7

Getting Started With Autotest CTS55

A

A

A

Autotest Start Menu

Step 3

fter pressing the "Start" k ey in
the Home Menu the Autotest
Start Menu screen is displayed.

Select the mobile type from the
list using the "MS Type" keys to
scroll through the list. 

Use the "Mode" key from within
the Config menu to select step
or continuous test mode. 

For the following sequence the
required settings are Mode =
Cont and Coupler = off. Press
the "Start" key to begin with the
test sequence.

Autotest Running Menu

fter pressing the "Start" k ey in
the Autotest Start Menu the
screen shown opposite appears.
CTS is now transmitting the
control channel and waits for the
mobile to synchronise to the
CTS (Location Update). 

Switch on the Mobile and enter
the PIN number when requested
to do so. 

s soon as the mobile is
synchronised the LocUpd box
will show a "".

1094.0006.55 3.6 E-7

CTS55 Getting Started With Autotest

Explanations:

 "MS Type" select keys

These keys are used to scroll thr ough the list of m obile types. Selecting a mobile type will cause the
values allocated to the mobile for Input Att, Output Att and the signal level for the sensitivity
measurement ( RxLev/RxQual and bit error r ate) to be used during the test. However, as the coupler
is set to off, the attenuations are not taken into account.

 "Mode" key

Step mode causes the CTS to s top after each test has been com pleted requiring the user to press
the "Continue" key. Continuous mode performs all the tests one after the other with no pause
between tests.

 Location update

The mobile is requested to m ak e a Location Update on the control c hannel. By the Location Update,
the base station is inform ed that a specific mobile has been s witched on in its area and is ready to
make and rec eive c alls . If the mobile is already switched on and "registered" when the test is started,
it will indicate "service" and wait. In this case, the m obile is synchronised to a near-by base station.
Switch the mobile of f and on again. If the m obile fails to perf orm a Location Update within a def ined
time period, the test will be aborted and the LocUpd box is marked as not executed ( see Autotest
menu).

 PIN number

Please be careful when entering the PIN number. T he card will be lock ed after three failed attempts.
The card will be released again upon entering the PUK num ber, which is either known to the user or
available from the office issuing the card. It is also advisable to read the relevant section of the
operating instructions of the mobile. It is convenient to use the R&S test SIM card which always
responds to the number "0000". (A locked R&S SIM card can be unlocked by keying in the PUK
number 12345678.)

Note 1: Display Modes
In Autotest mode the results are available in two different f orms, as Pass/ Fail form or as m easured

values. Measurement tolerances can be also be displayed. To switch between the result forms and
the tolerance display the fifth softkey from the top has to be pressed. The name of the softkey
changes to show what will appear next.

Note 2: Partitioning of the screen
The Test Menu screen is divided into the parts:

• Part 1
The state of a measurement; this can be "Pass", "Fail" or the result value of the measurement.

• Part 2
The state of a signalling procedure and the echo test. This can be a "f" or a "".

• Part 3
The activity message. This is information about an error or about an action to be done by the
user.

1094.0006.55 3.7 E-7

Getting Started With Autotest CTS55

Status message

Call to MS: run
Activity message

When mobile rings please answer.

3

1

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HI

ABC

DE

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564

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R

CL M

Status message
Call to MS: 

--------------------------------------------------------------------------------­Status message
Echo Test: run

Activity message
Please confirm "OK" or "fail"

Status message
Echo Test: /f

---------------------------------------------------------------------------------

Status message
MS Release: run

Activity message

Please release mobile

Step 4

After the Location Update the
mobile is called from the test
station.

Answer the call when the tele­phone rings. 

The test step has been comple­ted successfully.

--------------------------------------------

Step 5

The test com es to a stop here so
that the user can speak into the
mobile and evaluate the quality of
the echoed message.
Press key "OK" or "FAIL" to
terminate this test step. 

--------------------------------------------

Step 6

Now terminate the call. 

3

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Status message
MS Release: 

The link has been cleared down

correctly.

1094.0006.55 3.8 E-7

CTS55 Getting Started With Autotest

Explanations:



CTS sends a call to the mobile. When the mobile rings, the user must press the relevant phone
button. As a result, a speech link is set up on the first channel, which can be selected in the
configuration menu. CTS will terminate the test step with a "" in the CallTo box if the mobile
functions properly. If the mobile does not ac cepts the call within a given time period, the test will be
terminated with a "f" in the CallTo box.



After link s et-up, CTS stores the speech signals rec eived and sends them bac k to the m obile with a
delay of one second. The user is thus able to speak into the microphone of the m obile with the link
set up and hear the echo after approxim ately one second in the loudspeaker. This permits the user
to evaluate the received speech quality. If it is okay, the echo test is successfully completed by
pressing the "OK" key. Otherwise, the test step should be terminated with the corresponding result by
pressing the "FAIL" key.



The user is r equested to hang up or, if it is a handy, to press the cor responding button. The test will
be terminated with "" if the s peech link is cleared down cor rect ly. Should the mobile fail to clear the
link down within a given time period, the test will be ended with a "f" in the NwRel box.

1094.0006.55 3.9 E-7

Getting Started With Autotest CTS55

Status message

Callfrom: run

Activity message

Please initiate a call from the mobile

3

1

2

G

HI

ABC

DE

F

564

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8

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R

CL M

Status message
Callfrom : 

---------------------------------------------------------------------------------

Status messages
Avg. Pow 1: run
Avg. Pow 2: run
Avg. Pow 3: run

Status messages

Avg. Pow 1: pass/fail
Avg. Pow 2: pass/fail
Avg. Pow 3: pass/fail

---------------------------------------------------------------------------------

Status message
RxLev: run
RxQual: run

Status message

RxLev: pass
RxQual: pass

Step 7

Make a call from the mobile. 

The test step has been

successfully completed

--------------------------------------------

Step 8

While this status message is
displayed, the average trans­mitter power of the mobile is
being measured. 

If the message "run" changes to

"pass", the measurement has
been successfully completed.
The result is within tolerances.

--------------------------------------------

Step 9

In this next test step the RxLev
and RxQual of the mobile is
measured. 

Measurement completed. The

result is within tolerances.

1094.0006.55 3.10 E-7

CTS55 Getting Started With Autotest

Explanations:



When the mobile has synchronised via the broadc as t channel ( SERVICE is indic ated on the mobile’s
display), the user is requested to mak e a call from the mobile. At this point the user m ay dial any
number. It is however advisable to choose a num ber that contains all 10 digits in order to verif y the
proper functioning of all k eys. CTS shows the dialled number on the display, so the user can see at a
glance whether all numeric k eys are in func tioning cor r ect ly. When the speech link is succ es s f ully set
up, CTS terminates the test step with a "".



The average transm itting power of the mobile is measured at three levels . The test will be terminated
with "pass" if the r esults are within their respective tolerance ranges. Otherwise the m essage "fail"
will appear.



Each GSM850/GSM/PCN/PCS m obile is capable of m easuring its received level (Rx Lev) as well as
the quality of the received signal (RxQual). The values for the two parameters are continuously
transmitted to the test unit. In this "sensitivity" measurem ent, the signal is sent to the mobile on the
speech channel at a selectable transm it level and the values obtained for RxLev and RxQual are
evaluated. In general, the value transmitted for RxQual is increasing with decreasing transmitting
level. The lower the transmitted RxQual value, the higher is the "sensitivity" of the mobile.

The test will be terminated with "pass" if the r esults f or RxLev and RxQual are within their respective
tolerances.

1094.0006.55 3.11 E-7

Getting Started With Autotest CTS55

Status message

Phase RMS: run
Phase PK : run
Frequency : run
Ramp : run

Status message

Phase RMS: pass
Phase PK : pass
Frequency : pass
Ramp : pass

-------------------------------------------------------------------------------- -------------------------------------------

Status message

BER : run
RBER II : run
RBER Ib : run
FER : run

Status message

BER : pass
RBER II : pass
RBER Ib : pass
FER : pass

-------------------------------------------------------------------------------- -------------------------------------------

-------------------------------------------------------------------------------- ------------------------------------------­Status message
Network Release: run

Status message
Network Release: 

--------------------------------------------------------------------------------- --------------------------------------------

This message shows when the

This message shows when the

The link has been cleared down

Step 10

The phase and frequency errors
as well as the power ramp are
measured during this step. 

test step is complete.

Step 11

Performing a bit error rate
measurement (BER). 

test step is complete.

Step 12 to 16

This is a repetition of the tests
eight to twelve for the second
user defined channel.

Step 17

The speech link is cleared down
by CTS. 

correctly.

1094.0006.55 3.12 E-7

CTS55 Getting Started With Autotest

Explanations:



In this step the power ramp, the phase error (PK) phase error (RMS) and the frequency error is
measured. T hese measurements c heck the quality of the transmitter of the m obile. Both the power
ramp graph and the frequency error graph can be displayed at the end of the Autotest sequence.



For the BER m eas urement the mobile is s et into the "Loop Back" mode to send any the received bits
back to the CTS. The CTS compares the received bits with the bits sent out and calculates the BER.



The test sequence ends with this test step.

Note:
The mobile can only be set to the state "loop back " (using a signalling procedure) if a test SIM card is
used. Therefore measurement of the bit error rate is not possible without a test SIM card and the
Autotest is aborted with a signalling error.

1094.0006.55 3.13 E-7

Getting Started With Autotest CTS55

Autotest Result Menu

Step 18

After the test sequence has
finished the m enu will have new
buttons as shown on the
opposite side. The "Restart" k ey
will repeat the test sequence.
The "Start Menu" key will return
to the Start Menu of the
Autotest. The "Meas" key will go
to the Power ramp Menu where
the power ramp is shown
graphically. The Phase Freq
graph will be available for
display from within the Power
ramp Menu. With the "Values"
key the display can be changed
to show the results as either
values, the tolerances or the
results as pass/fail values. The
text on the key will change to
show the next screen in the
toggle sequence. "Print Report"
prints the measurement results
into the printer protocol.

1094.0006.55 3.14 E-7

CTS55 Test Sequence

4 Autotest Sequence in Detail

4.1 General

The tests to be carried out in the Autotest mode are optimised to enable the user to draw a conclusion in
the shortest possible time on whether the m obile is func tioning corr ectly or not. The CT S is however not
capable of checking the GSM s pecific ation in all its details. A chec k of this type would of course require
a considerably greater expenditure in time and test equipment.

The first five test s teps of the Autotest are concerned with establishing and releas ing the link between
the mobile and the CTS. If any one of these tests fails the link cannot be established or released
properly and testing ends with the "fail" message. If the tests are succ essful a "9" is placed in the box
next to the test name.

The remaining tes ts are measurements. T he r es ults of these measurem ents are s hown either as values
or as pass/fail messages. It is possible to toggle between the displays for measured value, pass/fail and
tolerance.

In Autotest the user can influence the duration of a test in several ways. Firstly he can choose to carry
out the measurements on one, two or three channels. Secondly he can vary the number of frames for
the bit error rate meas urement. The shortest test is achieved by carrying out the test on one channel
only and by setting the number of frames for the bit er ror rate m easurement to the m inimum . However,
this will exclude the channel change test that is carried out when switching to the second and third
channel.

Furthermore the user has the option to either freely define the tolerances for the m easurem ents car ried
out in Autotest or to select one of two predefined sets of tolerances. The two predefined sets of
tolerances are called "narrow" for narrow tolerances and "wide" for wide tolerances. For the freely
definable tolerances the "custom " set of tolerances m ust be s et, however in this case the tolerances are
taken from the Manual Test. The table below shows the predefined tolerances for each set of tolerances
and the tolerance parameters taken from the Manual Test.

Note:
The tolerances for the frequency error depend on the network (GSM850, GSM, PCN, PCS).

Measurement wide narrow (Rec) Custom

Avg. Pow 1
Avg. Pow 2
Avg. Pow 3

RxLev
RxQual

Phase RMS
Phase PK

Frequ. GSM/GSM850
PCN/PCS
Ramp

RBER II
RBER Ib
FER

± 5 dB
± 5 dB
± 5 dB

± 5 dB
≤ 6.4%

< 5°
< 20°

90 Hz
180 Hz
Power Ramp

(Template)

Config
< 5.2%

< 0.8%
< 2.0%

The user can also configure Autotest to perform either a one or two band test. A two band test
sequence will allow two GSM bands to be tested within the same sequence, in addition to perfor ming
two handover tests. These being the handover to the new GSM band and the handover from the new
band back to the original GSM band.

± 3 dB
± 3 dB
± 3 dB

± 4 dB
≤ 3.2%

< 5°
< 20°

90 Hz
180 Hz
Power Ramp

(Template)

Config
< 2.6%

< 0.4%
< 1.0%

Config Power Ramp : Tol highest PCL
Config Power Ramp : Tol other PCL
Config Power Ramp : Tol other PCL

± 5 dB
≤ 6.4%

Config Phase/Freq : Phase E rror (RMS)
Config Phase/Freq : Phase E rror (P K)

Config Phase/Freq : Frequency Error
Config Power Ramp

Config BER : Class II
Config BER : Class Ib
Config FER : Frame

(Template)

(current)

(current)

(current)

1094.0006.55 4.1 E-6

Test Sequence CTS55

In the description of the automatic sequence below it is assum ed that the measurements are c arr ied out
on two channels and that the wide tolerances are used.

In the description of the steps of the Autotest the pos sible caus es f or an err or are listed. T his list cannot
be regarded as complete and merely contains possible faults that are easy to eliminate e.g. flat
batteries.

Before the description of the tests here are some errors common for all test steps:

• The mobile is switched off during a running test sequence.

In this case the error message "Detach not expected" may appear on the screen.

• The connection is released from the mobile in a state which the release is not expected.

In this case the error message "Mobile has been released during power measurem ent, sensitivity
measurement, ..." appears on the screen.

• There are problems with the signalling of the mobile (messages of the mobile are wrong).

In this case the error m essage "Signalling error during Location Update, Call To, ..." appears on the
screen.

1094.0006.55 4.2 E-6

CTS55 Test Sequence

4.2 1st Step - Start

The Autotest Start Menu can be used to select the mobile type for testing and to set the coupler if one is
being used. In this m enu also is displayed the New External Attenuation Settings for a “ low”, “mid” and
“high” Band. Please see section 9.9.5 Config MS T ype. The “low”, “mid” and “high” channel boundaries
are dependent on the test network being used. The tes t is started by means of the "Start" key in the
Autotest Start Menu.

Autotest Start Menu

Local configuration of Autotest parameters can be accomplished f rom the „Autotest Config“ menu by
pressing the „Config“ softkey from the „Autotest“ Start Menu.

Autotest Config Menu Config Network Menu

When the m obile type is selec ted the stored values f or input and output attenuation and sensitivity level
are loaded into the instrument. The s ensitivity level is used as transm it level of the CTS for both the
measurement of RxLev/RxQual and for the BER measurement.

The attenuation settings for the GSM 850, GSM 900, GSM 1800 and GSM 1900 frequenc y bands can
be displayed by pressing the „MS Type Details“ Softkey prior to starting the test sequence. First
attenuation settings for GSM 900 and GSM 1800 are displayed. Press “Show 850/1900” button in order
to see GSM 850 and GSM 1900 values.

1094.0006.55 4.3 E-6

Test Sequence CTS55

MS Type Details Menu

The „Autotest Running“ menu dis played in Autotest when the „Start“ key is pressed, is determined by
the band settings of the currently selected band within the „Handover Details“ m enu. This m enu can be
selected from within the main configuration menu.

Config – Select Menu Handover Details Menu

Depending on how the instrument has been configured will determine which of the two „Autotest
Running“ menus will be displayed when the Autotest sequence is initiated. The above menu setting
indicates that the instrument is c urrently configured to use the GSM 900 band as the location update
band. Any handover attempt will be made to the GSM 1800 band.

Hint:

If a single band mobile is to be tested, then it is necessary to disable any handover steps being
attempted. This can be achieved f rom the general “Config – Selec t” Menu, within "Handover Details" by
changing the “Network Switch” to the single band setting.

If a single band mobile is tested with an instrum ent that has been conf igured to support handover, then
Autotest will fail the handover step and ultimately fail the complete test.

1094.0006.55 4.4 E-6

CTS55 Test Sequence

Autotest Running Menu Autotest Running Menu

If the instrument has been c onfigured for Dual Band handover, as in the above example, then a two
band autotest sequence will be attempted. This is depicted by the HO step in the signalling box.

A single band test will contain the NwRel as the final signalling step.
If a test cycle has already taken place, it is possible to start f rom the Autotest Result Menu using the

"Restart" key. The tes t sequence can be terminated at any time before it is c ompleted by pressing the
"Stop" key in the Autotest Running Menu. The "Continue" k ey is used in step mode of the Autotest to
continue with the next step of the test sequence. T he "Menu Up" hardkey returns to the previous m enu
regardless of the state of the test. Any test results collected will be lost when the "Menu Up" key is
pressed.

Config - Select Menu Config Autotest Menu

To skip a test from being perfomed by Autotest Choose “Config – Selec t ”– “”Configure Autotest” and
set “No” to the tests in the “Config – Autotest” menu.

1094.0006.55 4.5 E-6

Test Sequence CTS55

4.3 2nd Step - Location Update

The CTS s ends the br oadc ast information on the contr ol c arr ier ( C0) . If f ollowing a request the mobile is
switched on, it will attempt to synchronise to this carrier by perform ing a Location Update. Should the
synchronisation be successful, the CTS terminates this test step with "9" in the LocUpd box. If the
synchronisation does not take place within a given time, the test will be ended with a "f" in the LocUpd
box. All subsequent tests will be skipped and the whole test sequenc e is terminated because it is not
possible to continue without a Location Update.

Possible causes for "fail":

• The network parameters MCC, M NC, NCC or LAC are wrong: see section 9.9.6 for information

on configuring the network parameters.

• Missing or incorrect power supply or defective battery.

• Switch-on button of mobile not actuated or faulty.

• Missing or poor RF connection (attenuation to be considered).

• No test SIM card, poor contact of SIM card or card reader of mobile faulty.

• The control channel is disturbed by a strong base station (if necessary use R & S shielded

chamber).

In all the above cases the error message "Location Update not received" appears on the screen.

1094.0006.55 4.6 E-6

CTS55 Test Sequence

4.4 3rd Step - Call to MS

The CTS makes a call to the mobile. W hen the mobile is ringing, the user must answer the call by
pressing the appropriate button on the mobile station. If the mobile functions properly, the speech link on
channel 1 is now set up. The CTS puts a "9" in the "Call to" box . T he channels c an be set in the Config
Channels menu which is reached by pressing the "Config" key. If the mobile does not accept the c all
within a given time per iod, the test is then ended with a "f" in the "Call to" box. All subsequent tests will
be skipped and the whole test terminated because it is not pos sible to perform any measurem ents on
the mobile without establishing a link.

Possible causes for a fail:

• Acoustic tone generator for the ringing tone is defective or too weak.

• The call was not accepted during ringing.

• The call-acceptance switch or button is defective.

In all the above cases the error message "Call to mobile not answered" appears on the screen.

• The mobile is switched off and on whilst a call to the mobile is in progress.

In this case the error message "Location Update not expected" appears on the screen.

• An unexpected call from the mobile is started by the user.

In this case the error message "Call from mobile not expected" appears on the screen.

4.5 4th Step - Echo Test

With a speech link set up with the CTS, it is possible to s peak into the m obile phone and to receive the
speech back with a delay of 1 second. This tes t allows the user to assess the quality of the speech link
in transmit and receive m odes. The test is ended with a "9" or a "f" when either the "OK" key or "FAIL"
key is pressed.

4.6 5th Step - MS Release

The user is requested at this point to r elease the link by pressing the appropriate button at the mobile.
After a correct clear down of the speech link , the test is conc luded with a "9" in the "MSRel" box. If this
does not take plac e within a given time period, the test is ended and all subsequent tests ar e skipped. A
"f" is put in the "MSRel" box and the whole test terminated.

Possible external causes for "fail":

• The switch or button for terminating the link is defective.

• The mobile has not been put on hook.

In all the above cases the error message "Time-out - no response by mobile" appears on the screen

1094.0006.55 4.7 E-6

Test Sequence CTS55

4.7 6th Step - Call From MS

After a short wait, the user will be requested to make a call from the mobile. Any number can be
selected. It is us eful for the c alled number to contain all 10 digits (0 to 9) as this tests all numeric k eys.
The CTS displays the dialled number (and outputs it in the test report printout) below the test results
box. The num eric k eys can thus be checked for m alfunctioning k eys. As soon as the speech link is set
up, the CTS concludes with a "9" in the "Call f r om" box. If the mobile does not s end out the c all within a
given time period, the test is ended with a "f" in the "Call f rom " box. All subsequent tests will be skipped
and the whole test terminated because it is not possible to perform any measurem ents on the mobile
without an established link .

Possible external causes for fail:

• The call switch or button is defective or was not actuated.

In this case the error message "Call from mobile not received" appears on the screen.

1094.0006.55 4.8 E-6

CTS55 Test Sequence

4.8 7th Step - MS Average Power

The average output power of the mobile is measured at three levels. T he levels which are used for the
measurement depend on the c onfigured PCL mode, see section 9.5.2. The default PCL mode is the
Auto mode.

Auto mode

The first level of m easurement is on the minim um allowable output power and depends on the power
class of the mobile and the external attenuation set. T he CTS takes the power c lass of the mobile into
consideration automatically. The second level of measurem ent is an intermediate value between the
maximum power level of the m obile and the m inim um power level used. The third level of measurement
is on the maximum output power and also depends on the power class of the mobile.

User mode

Power control levels defined by the user in the Config-Autotest (see section 9.5.2) are used for the
average output power measurement.

The following tables show the power values in dBm f or the power control levels for GSM, GSM 850,
PCS and PCN. Included in the listing are the maximum values for the power classes and the wide
tolerances.

GSM and GSM 850

Power control

level

15 13 8 to 18 10 to 16
14 15 10 to 20 12 to 18
13 17 12 to 22 14 to 20
12 19 14 to 24 16 to 22
11 21 16 to 26 18 to 24
10 23 18 to 28 20 to 26

9 25 20 to 30 22 to 28
8 27 22 to 32 24 to 30
7 29 (highest level for class 5) 24 to 34 27 to 31
6 31 26 to 36 29 to 33
5 33 (highest level for class 4) 28 to 38 31 to 35
4 35 30 to 40 33 to 37
3 37 (highest level for class 3) 32 to 42 35 to 39
2 39 (highest level for class 2) 34 to 44 37 to 41

PCN and PCS

Power control

level

13 4 (lowest level for class 2) -1 to 9 0 to 8
12 6 1 to 11 2 to 10
11 8 3 to 13 4 to 12
10 10 (lowest level for class 1) 5 to 15 6 to 14

9 12 7 to 17 8 to 16
8 14 9 to 19 11 to 17
7 16 11 to 21 13 to 19
6 18 13 to 23 15 to 21
5 20 15 to 25 17 to 23
4 22 17 to 27 19 to 25
3 24 (highest level for class 2) 19 to 29 22 to 26
2 26 21 to 31 24 to 28
1 28 23 to 33 26 to 30
0 30 (highest level for class 1) 25 to 35 28 to 32

Nominal power (dBm) Tolerance (dBm)

wide

Nominal power (dBm) Tolerance (dBm)

wide

Tolerance (dBm)
acc. to GSM-recommendation

Tolerance (dBm)
acc. to GSM-recommendation

1094.0006.55 4.9 E-6

Test Sequence CTS55

The test will be concluded with "pass" if all three measured values lie within their tolerances.
The tolerances have been given an appropriate wide window to allow for attenuation inaccuracies when

using an antenna coupler.
Possible external causes for "fail":

• The actual attenuation of the RF connection does not correspond to the attenuation set on

the CTS.

1094.0006.55 4.10 E-6

CTS55 Test Sequence

4.9 8th Step - Sensitivity (RxLev and RxQual)

Every GSM mobile phone is capable of m easuring the power level and quality of the signals it rec eives.
The result of these m easurements are the RxLev and the RxQual values. Dur ing testing these values
reported back to the CTS continuously by the mobile.

The sensitivity measurement consists of sending a selected power level (the sensitivity level of the
mobile type) on the speech channel to the mobile. The measured RxLev and RxQual values are
displayed on the screen.

Transmit. level
(dBm) CTS

-100

set level

Level tolerance
(dBm) on mobile
(wide)

-105 to <-94
(1)*

RXQUAL (max. value) max. bit error rate (%)

5 5.2

1)* set level -5 dB ... <set level +6 dB → Example: level = 100 dBm, tolerance = -105 ... <-94 dBm.

The test will be concluded with "pass" if all values lie within their toleranc es. The tolerances have been
given a wide range to allow for attenuation inaccuracies when using an antenna coupler.

Possible causes for "fail":

• The actual attenuation of the RF connection does not correspond to the attenuation set on
the CTS.

4.10 9th Step - Phase/Frequency Error and Power Ramp

These are the transmitter measurements of the of the mobile.

Phase error RMS

The phase error RMS is calc ulated by comparing the power burst received f rom the telephone with the
phase characteristic of an ideal modulator. The maximum error allowed is plus 5° (wide tolerances).

Phase error Peak

The peak phas e er ror is calc ulated by comparing the phase of the power burst received f r om the mobile
with the phase characteristic of an ideal m odulator. The maximum er ror allowed is plus or minus 20°
(wide tolerances).

Frequency error

The frequency error of the mobile is measured at this step.
Tolerances: ± 90 Hz GSM/GSM850

(wide) ± 180 Hz PCN/PCS

Power Ramp

This measurement compares the burst received from the mobile with a predefined tolerance window.

1094.0006.55 4.11 E-6

Test Sequence CTS55

4.11 10th Step - Bit Error Rate

The measurem ent is perfor med at the sensitivity level defined for the mobile type. The measurement is
made by sending bits to the mobile. The m obile echoes the bits back to the CT S, where the original bits
are compared with those echoed back. The difference between the two values is expressed as a
percentage.

The BER measurement has three results:
Tolerance (wide)

RBER (residual bit error) of the Class II bits 5.2%
RBER (residual bit error) of the Class Ib bits 0.8%
FER (Frame erasure rate) 2.0%

For the BER measurement 250 speech frames are used.
RBER Class Ib and FER are subject to the α-evaluation; i.e, with high RBER Class Ib and low FER or

with low RBER Class Ib and high FER both are evaluated "pass".

4.12 Steps 11 - 14 - Measurements on the second channel

The measur ement in the steps 7 to 10 ar e done on the first channel defined for the Autotest. In the
steps 11 to 14 the sam e measurem ent are carr ied out again but on the second channel defined for the
Autotest. The tolerances are the same as for the measurements on the first channel.

4.13 15th Step – Handover or Network Rel ease

During this step the CTS will either per form a network release or attem pt a handover to the new band.
The step action is determ ined by the settings within the „Handover Details“ menu. If the instrument is
configured for Dual Band handover, then the CTS will attempt a handover at this point.

If the instrument is not c onfigured f or Dual Band handover, then the CTS will attem pt a network release
prior to concluding the test sequence. Following a correct close down of the speech link, the test is
concluded with a "9" if successful or a "f" if not.

If a handover is attem pted and suc ceeds, then the CT S will perform an ec ho test in the new band. After
completion of the echo test, s teps 4.8 – 4.12 will be attem pted in the new band. Provided that each step
in the second band reaches a meas ured conclusion, then a further handover bac k to the original band
will be attempted.

The final step of the two band autotest s equence is the sam e as a single band test and is to perf orm a
network release.

Hint:

If a single band mobile is to be tested, then it is necessary to disable any handover steps being
attempted. This can be achieved f rom the general “Config – Selec t” Menu, within "Handover Details" by
changing the “Network Switch” to the single band setting.

If a single band mobile is tested with an instrum ent that has been conf igured to support handover, then
Autotest will fail the handover step and ultimately fail the complete test."

At the end of the tes t c ycle, an over all test res ult is obtained on the last line of the dis play. More detailed
results and measurements can now be output on a printer by pressing the "Print Report" key if the
option CTS-B5 is installed.

1094.0006.55 4.12 E-6

CTS55 Test Sequence

4.14 Test Sequence in Single Step Mode

To operate in the single step mode, the "Test Mode" key in the Autotest Main Menu must be set to
"Step". The test procedur e is the sa me as described above. The CT S however stops the tes t af ter every
step and waits until the "Continue" key is pressed.

4.15 Viewing the results of a two band autotest sequence

The following two menus diff erentiate between the results displayed after the completion of an autotest
sequence and ultimately depend on whether a one or two band autotest sequence has been executed.

Autotest Results Menu Autotest Results Menu

When a two band test sequenc e has completed, the results f or a particular band may be displayed by
pressing the „Other Band“ s oftkey. This provides a basic two way toggle between the results for each
band. Similarly, the tolerances or signalling results c an als o be toggled in the same way by first selecting
the signalling or tolerances menu and then pressing the „Other Band“ softkey.

In the event that a single band test has been performed, then the „Other Band“ softkey will not be
present.

Displaying the power ramp display and phase f requency graphs are doubled up into the „Meas“ sof tk ey.
Pressing the „Meas“ softkey displays the „Power Ramp“ menu and the „Phase Freq“ menu can be
selected from within the „Power Ramp“ menu. The Power Ramp and Phase Freq graphs that are
displayed when their respective menus are selected, relate to m easurem ents recorded in the last band
of the test sequence.

A hardcopy of the measurement r esults can be obtained by pressing the „Print Report“ key. This will
generate a pass/ f ail report when the „Pas s/Fail“ results m enu is viewed and a values report when the
„Values“ results menu is viewed.

When a two band Autotes t sequence has run to c onclusion, then a two page report, that has res ults for
both test bands will be produced if requested. If the Autotes t sequence has tested only a single band
then only a one page report containing results for that band will be printed if requested.

1094.0006.55 4.13 E-6

CTS55 Getting Started With Quicktest

5 Getting Started With Quicktest

5.1 Overview

The Quicktest, in the s ame way as the Autotest, comprises a predefined sequence of test steps. How­ever, in order to achieve a particularly fast function tes t this sequenc e has been reduc ed to the absolute
minimum. The test sequence comprises the four test steps below

• Location Update (see Autotest, Chapter 3, Step 3)

• Call to Mobile (see Autotest, Chapter 3, Step 4)

• Echo Test (see Autotest, Chapter 3, Step 5)

• Network Release (see Autotest, Chapter 3, Step 17)

With the exception of a f ew insignificant exc eptions these test st eps matc h those descr ibed in the intro­duction for the Autotest (Chapter 3). This means that all general comments on the Autotest and all notes
and additional information for thes e steps also apply to Quicktes t. In the following only the differences in
Quicktest are explained. We therefore recommend that you read Chapter 3 before you continue.

1094.0006.55 5.1 E-6

Getting Started With Quicktest CTS55

5.2 Test of Mobile

RF OUT 2 GSM

RF IN / OUT GSM

INPUT POWER LIMITED

DIGITAL RADIO TESTER CTS 55 1094.0006.55

50

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CAUTION

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Step 1

As already described in Step 1 of
the Autotest the mobile must be
connected to the N socket RF
IN/OUT of the CTS. The mobile
must also be supplied with the
correct operating voltage. c, d.

After the CTS is switched on the

Home Menu shown opposite
appears after a f ew seconds . T he
instrument is now ready for test­ing. Press the "Test Mode" k ey to
toggle between Manual Test,
Autotest, Quicktest and Module
Test (select "Quicktest").

Home Menu

---------------------------------------------------------------------------------

Cheque card format

GSM
TEST SIM

CRT-Z2 1039.9005.02

Plug-In-Format

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Press "Start", to go to the main
Quicktest menu. Press "Net Ty­pe" to select the type of network
and "Config" to call up the con­figuration menu. The description
in this chapter assumes that
"GSM" has been selected as the
network type.

--------------------------------------------

Step 2

Insert a test SIM card of the right
format into the mobile. e, f.

1094.0006.55 5.2 E-6

CTS55 Getting Started With Quicktest

Explanations:

c RF connection to mobile

For the RF connection to the mobile st ation, a high-grade cable should be used with an attenuation
ideally below 0.5 dB per meter. Hand held m obiles c an be c onnected us ing the c ar ins tallation s et of ­fered by suppliers of mobiles. The following description of "Getting Started" assumes a good RF
connection so that compensation f or external attenuation is not necess ary. The "Coupler" key in the
Main Menu of the Autotest has to be set to off.

d Power supply of mobile

If the mobile is s upplied from an external power supply unit, mak e sure that this unit can provide the
required peak current. Digital mobile phones generate pulsed signals at RF and thus f requently have
a pulsed current drain. Problem s ma y arise if power supplies are used that c annot provide such c ur­rents at constant voltage.

e SIM card

GSM specifications define two f ormats of SIM card: cheque card form at or a considerably smaller
format, the 15 x 20 mm plug-in SIM card. A mobile must have a SIM card inserted to be able to
make a call. For tes ts on mobiles performed with CTS, the test SIM card from Rohde & Schwarz
should be used.

f Test SIM card

The Rohde & Schwarz test SIM card can be ordered as an accessory unit under the designation
CRT-Z2 (Order No. 1039.9005.02). This card has cheque card format but c an easily be exchanged
for a plug-in card.

1094.0006.55 5.3 E-6

Getting Started With Quicktest CTS55

A

Quicktest Main Menu

Step 3

After pressing the "Start" k ey in
the home menu the Quicktest
main menu is opened.

Select the mobile type from the
list using the "MS Type" keys to
scroll through the list.

In this menu are displayed the
New External Attenuation Set­tings for a “low”, “mid” and
“high” Band. Please See Sec­tion 9.9.5 Config MS Type. The
“low”, “mid” and “high” channel
boundaries are dependent on
the test network being used.

For the Quicktest the coupler
must be switched off ("off").
Press "Start" to start the test
sequence. g.

Quicktest Menu (Test)

fter pressing the "Start" k ey in
the Quicktest Main Menu the
menu shown opposite appears.
The CTS is now transmitting the
control channel (BCCH) and
waits for the mobile to synchro­nise to the signal (location up­date on the CTS). This process
is called Location Update and is
indicated by the symbol in the
left window. The fact that this
process is running is indicated
by the yellow background.

Switch on the mobile and enter
the PIN number after the
prompt.

As soon as the mobile has syn­chronised successfully the
background of the symbol
changes to green. An error in
the location update is indicated
by a red background. h, i.

1094.0006.55 5.4 E-6

CTS55 Getting Started With Quicktest

Explanations:

g "MS Type" select keys

These keys are used to scroll thr ough the list of m obile types. Selecting a mobile type will cause the
values allocated to the mobile for Input Att, Output Att and the signal level for the sensitivity meas ­urement (RxLev/Rx Qual and bit er ror rate) to be us ed during the test. However, as the c oupler is s et
to off, the attenuations are not taken into account.

h Location update

The mobile is requested to m ak e a Location Update on the control channel. By the Location Update,
the base station is inform ed that a specific mobile has been switched on in its area and is ready to
make and rec eive c alls . If the mobile is already switched on and "registered" when the test is started,
it will indicate "service" and wait. In this case, the mobile is synchronised to a near -by base station.
Switch the mobile of f and on again. If the m obile fails to per form a Location Update within a defined
time period, the test will be aborted and the LocUpd box is m arked as not executed (see Autotest
menu).

i PIN number

Please be careful when entering the PIN number. T he card will be locked after three failed attempts.
The card will be released again upon entering the PUK num ber, which is either k nown to the user or
available from the off ice iss uing the card. It is also advisable to read the r elevant sect ion of the oper­ating instructions of the m obile. It is c onvenient to use the R&S test SIM card which always responds
to the number "0000". (A locked R&S SIM card can be unlocked by keying in the PUK number

12345678.)

1094.0006.55 5.5 E-6

Getting Started With Quicktest CTS55

Activity message

Answer, if the phone rings

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Activity message
Confirm “Pass” or “Fail”

Step 4

After the Location Update the
mobile is called from the test
station. The background of the
second symbol changes to yel­low.

Answer the call when the phone
rings.

As soon as the connection is
established the background of
the symbol changes to green. An
error is indicated by a red back­ground. j.

--------------------------------------------

Step 5

The test com es to a stop here so
that the user can speak into the
mobile and evaluate the quality of
the echoed message.

Press "Pass" or "Fail" to termi­nate this test step. k.

---------------------------------------------------------------------------------

--------------------------------------------

Step 6

In this final step the speech link is
cleared down by the CTS. As
soon as the link has been suc­cessfully cleared the background
of the symbol changes to green.
An error is indicated by a red
background. cb.

1094.0006.55 5.6 E-6

CTS55 Getting Started With Quicktest

Explanations:

j

CTS sends a call to the m obile. W hen the m obile rings, the us er m ust press the relevant phone but­ton. As a result, a speech link is set up on the first channel, which can be selected in the configura­tion menu. CTS will terminate the tes t step with a "9" in the CallTo box if the m obile functions prop­erly. If the mobile does not accepts the call within a given tim e period, the test will be terminated with
a "f" in the CallTo box.

k

After link s et-up, CTS s tores the speech signals received and sends them back to the m obile with a
delay of one second. The user is thus able to speak into the microphone of the mobile with the link
set up and hear the echo after approximately one second in the loudspeaker . This permits the user
to evaluate the received speech quality. If it is okay, the echo test is successfully completed by press­ing the "OK" key. Otherwise, the test step should be terminated with the corresponding result by
pressing the "FAIL" key.

cb

The test sequence ends with this test step.

1094.0006.55 5.7 E-6

Getting Started With Quicktest CTS55

Quicktest Menu (Results)

Step 7

After the test sequence has
finished the menu will have
new buttons as shown oppo­site. Press "Restart" to start
the test sequence again.
Press "Start Menu" to call up
the Autotest Main Menu. For
an error free test all symbols
must show a green back­ground. If one of the symbols
has a red background or if
tests were skipped the test
has detected a fault in the
mobile.

1094.0006.55 5.8 E-6

CTS55 Getting Started With Manual Te st

6 Getting Started With Manual Test

6.1 Overview

Unlike Autotest and Q uicktest the Manual T est mode does not have a fix ed sequence of tests. Ins tead
the user selects the required test using the buttons and menus.

In Manual Test m ode the CTS for digital m obiles is easy and convenient to operate thanks to its clear­cut menu structure.

If this is your first encounter with CTS in Manual T est mode, this chapter will give you a quick survey of
tests performed on mobile stations. You will be guided step by step through the Manual Test menus.

Each step is provided with reference numbers, e.g. circles with a number (c) relate to further
information to be found below.

The layout and the contents of this chapter are tailored to application requirements and provide
information both on CTS and GSM, PCS and PCN.

To become familiar with CTS in Manual Test mode and its wide variety of test functions, try out the
functions described im mediately using a CTS and a mobile. The instructions and inform ation given in
this chapter are based on the assumption that the mobile station is connected to the CTS via a cable.

Important notes:

In order to exclude unpredictable circumstances that may arise due to the use of a network SIM card
(e.g. the SIM card prohibits the registration (Loc ation Update) on the network simulated by CTS or it
probibits the signalling f or the bit error test), it is s trongly recommended that an R&S GSM test SIM card
(part CRT-Z2) is used.

The GSM, PCN and PCS networks are cellular networks. The area to be covered by the network is
divided up into honeycomb-shaped cells in the ideal case.

Each cell accomm odates a base station transm itting the control information on a def ined channel. The
CTS is sim ulating the radio network , i.e. the base station, so that a c ontrol channel is trans mitted. If the
CTS is in the area of a cell m ak e sur e that the control c hannel of the CTS dif fers from that of the cell. In
the case where the CT S uses the s ame channel as the base station of the cell, the mobile phone m ay
try to register with the cell or the Location Update with the CTS may be disturbed.

Special attention is required when using an antenna coupler (see chapter 8).

1094.0006.55 6.1 E-6

Getting Started With Manual Te st CTS55

6.2 Test of Mobile

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RF OUT 2 GSM

RF IN / OUT GSM

INPUT POWER LIMITED

DIGITAL RADIO TESTER CTS 55 1094.0006.55

50

>

50

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CAUTION

Home Menu

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Cheque card format

GSM
TEST SIM

CRT-Z2 1039.9005.02

Plug-In-Format

3

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Step 1

Connect the N socket RF IN/OUT
of CTS with antenna connector of
mobile. c

Make sure that the mobile is
provided with the required supply
voltage (charged battery or power
supply unit). d

After the CTS is switched on the

Home Menu shown opposite
appears after a f ew seconds . T he
instrument is now ready for
testing. Use the "Test Mode" key
to toggle between the Manual
Test, Autotest, Quicktest and
Module Test modes (m ust be set
to Manual Test).

Press "Start" to go to the Main
Menu of the first menu of the
Manual Test (MS Test/Wait
Sync) With the "Net Type" key
the network type can be selected
and with the "Config" key the
configuration menus can be
reached. e

---------------------------------------------

Step 2

Insert test SIM card of the right
format into the mobile. f, g

Note: Network SIM cards prohibit
measurement of the bit er ror rate.
The Autotest can therefore only
be carried out fully if a test SIM
card is used.

1094.0006.55 6.2 E-6

CTS55 Getting Started With Manual Te st

Explanations:

c RF connection to mobile

For the RF connec tion to the mobile st ation, a high-grade cable should be used with an attenuation
ideally below 0.5 dB per meter. Hand held mobiles can be connected using the car installation set
offered by suppliers of m obiles. The following description of "Getting Started" assum es a good RF
connection so that compensation f or external attenuation is not necessary. The "Coupler" key in the
Main Menu of the Autotest has to be set to off.

d Power supply of mobile

If the mobile is supplied f rom an exter nal power supply unit, make sure that this unit can provide the
required peak current. Digital m obile phones generate pulsed s ignals at RF and thus f requently have
a pulsed current drain. Problems may arise if power supplies are used that cannot provide such
currents at constant voltage.

e Test Mode and NetType keys

The remainder of this chapter assumes that the "Test Mode" was set to Manual Test and the "Net
Type" to GSM.

f SIM card

GSM specifications define two f ormats of SIM card: cheque card form at or a considerably smaller
format, the 15 x 20 m m plug-in SIM card. A mobile must have a SIM card inserted to be able to make
a call. For tests on m obiles perf orm ed with CT S, the test SIM car d from Rohde & Schwarz should be
used.

g Test SIM card

The Rohde & Schwarz test SIM card can be ordered as an accessory unit under the designation
CRT-Z2 (Order No. 1039.9005.02). The card has cheque card form at but can easily be exchanged
for a plug-in card.

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Getting Started With Manual Te st CTS55

A

A

MS Test/Wait Sync Menu

Step 3

fter the start button is press ed in
the Home Menu the CTS is now
transmitting the control channel
(BCCH) and is waiting for the
mobile phone to synchronise
(Text "W aiting for location update
or make a call from the mobile"
blinks).

fter the mobile station is
switched on the text changes to
"Location Update in Progress"
The blinking text indicates that a
Location Update is taking place
between the CTS and the mobile
phone. h

The vertical bar indicates that the

CTS is receiving an RF signal

MS Test/updated Menu

from the mobile phone. i

As soon as a Location Update

has been successfully
completed, the display will
change to the next menu level
automatically. j

At this point information f rom the
mobile is displayed, that is the
IMSI, the IMEI and the Power
Class together with the
maximum power the mobile can
transmit. k, cb, cc, cd.

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CTS55 Getting Started With Manual Te st

Explanations:
h Location Update

The mobile is requested to m ake a Loc ation Update on the control channel. By the Location Update,
the base station is inf ormed that a specific m obile has been switched on in its area and is ready to
make and receive c alls. If the m obile is already switched on and "register ed" when the test is started,
it will indicate "service" and wait. In this case, the m obile is synchronised to a near-by base station.
Switch the mobile off and on again.

i Analogue RF Power Indicator

The analogue bar in the CTS display indicates whether the CTS is r eceiving RF power of the mobile
phone. The indicator f eatures a fast reaction tim e and a hold function so that even short pulses ar e
detected reliably and indicated. This is particularly useful if the mobile phone does not perform a
Location Update or a call setup. In this case, it is possible to determine immediately whether the
mobile is transmitting or not; e.g. there may be a problem in signalling or in the modulation.

j Location Update not Successful

If the mobile does not attem pt to perfor m a Location Update, it is pos sible that the network sim ulated
by the CTS does not correspond to that searched for by the mobile phone ac cording to the SIM card
used. In this case, the parameters can be matched in the network menu.

k Subscriber Number

The international subscriber num ber or IMSI (International Mobile Subscriber Identity) is read from
the SIM card. It consists of three fields:

• A three-digit Mobile Country Code (MCC) used to indicate the "HOME" country of the card.

• A two-digit Mobile Network Code (MNC) used to indicate the "HOME" network.

• The Mobile Subs criber Identification Number (IMSI), which m ay be up to ten digits long, used to

clearly identify a subscriber within a network.
The values for the Rohde & Schwarz test SIM card are: 001 01 0000000001.

cb Equipment Id.

The Equipment Id. or IMEI (International Mobile Equipment Identity) is stored in the mobile hardware.
It consists of four fields:

• Type Approval Code (TAC), six digits, allocated by type approval authorities.

• Final Assembly Code (FAC), two digits, identifies the manufacturer.

• Serial Number (SNR), six digits, unique number within TAC and FAC.

• Spare (SP), one digit, not yet used.

cc Mobile Power Class

All mobile phones belong to a particular power class which indicates the maximum output power
available from the GSM mobiles:

Power Class GSM900 GSM1800 / GSM1900

1 --- 30 dBm
2 39 dBm 24 dBm
3 37 dBm 36 dBm / 33 dBm
4 33 dBm --­5 29 dBm ---

cd Mobile Station Details

The MS Details button will indicate to the user if the Mobile Station is capable of supporting Extended
GSM frequencies and / or is Dual Band (900 / 1800 MHz).

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Getting Started With Manual Te st CTS55

Step 4

It is now possible to call the

3

1

2

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ABC

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F

564

7

8

9

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XYZ

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R

CL M

HI

mobile phone by pressing the
"Call to mobile" key or by dialling
a number on the mobile phone.

In both cases, the display will

change to the Call Established
Menu

This is the central measurement
menu with an overview of the
transmitter meas urem ents. Detai­led transmitter and rec eiver mea­surement results can be dis­played by selecting and starting
the appropriate measurement.

Call Established Menu

Also the mobile’s power level
(Ctrl Level) the RF Channel and
the transmitted power of the CT S
(Tune BS-Sig) can be changed.

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Getting Started With Manual Te st CTS55

Call Established Menu

MS Test/updated Menu

In the "MS Test/updated" menu is

Step 5

The call to the mobile is released
when pressing softkey "Call
Release". Menu "MS
Test/updated" appears again.

a softkey labelled "Send SM". By
pressing this softkey a fixed text
short message (mobile
terminated) will be sent to the
mobile. Mobiles which do not
have SMS capability will ignore
the message and the CTS will
inform the user that the transfer
was unsuccessful. If a short
message is s ent from the mobile
(mobile originated) to the CTS
then the text received by the CTS
will be shown on the display.

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Getting Started With Manual Te st CTS55

6.3 Transmitter Measurements

Step 1

In the Call Established Menu the
currently used Power Control
Level (Ctrl Level), RF channel
and the transmitted power of the

Power Ramp Menu

CTS (BS Signal) are displayed
together with measurements of
the phase and frequency errors.

c

Also the power reported by the
mobile phone (RxLev), the
average power (Avg. Power) and
the peak (Pk. Power) power
values measured by the CTS are
displayed together with the power
ramp evaluation.

In addition, the signal quality
reported by the mobile (RxQual)
is displayed.

If any measurements are out of
tolerance they are displayed with
red colour.

After selecting "Ramp" by

pressing the "Measure Select"
key and starting of the
measurement ("Start Measure")
in the Call Established menu the
Power Ramp screen (shown

opposite) will be displayed.

The RF burst of the mobile phone
is indicated graphically.

Using the "View" key a part of the
curve may be expanded.

If the ramp is out of toleranc e the
faulty section is highlighted at the
bottom of the display

d

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CTS55 Getting Started With Manual Te st

Explanations:
c Phase/Frequency Error

GSM mobile phones synchronise themselves to the frequency of the base station. The CTS
therefore measures the frequency error (frequency offset) of the mobile transmitter and not the
absolute frequency. The phas e er ror is measured by calculating the expected phase of the RF signal
from the decoded bits and c omparing this to the actual phase m eas ur ed by the CTS. Two values ar e
defined in GSM: the absolute maximum (peak) err or in a burst and the average (RMS) error in a
burst.

d Power Ramp

The power ramp is displayed with approximately 55 dB dynamic range.
Please note that it is possible for the average power during a burs t to be out of tolerance whilst the
power ramp is in tolerance, and vice- versa. T his is because the power ramp tolerances, accor ding to
the GSM specifications, are mainly based on variations from the average power and are not absolute
values.

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Getting Started With Manual Te st CTS55

Phase Frequency Menu

6.4 Receiver Measurements

After selecting "Phase Freq" by

pressing the "Measure Select"
key and starting the measu­rement ("Start Measure") in the
Call Established menu the
Phase Frequency menu with the
detailed measurement r esults will

be displayed.

Step 1

In the Call Established menu
press "Measure Select" until BER
is highlighted. Pressing "Start
Measure" will change the screen
to the one shown opposite. The
RxLev and RxQual values
measured by the mobile phone
and reported to the CTS are
displayed and continuously
updated.

Also the bit rate is constantly
displayed. This is the average
value over the current number of
samples. The RBER II, RBER Ib
and FER averages are shown as
percentages.

e

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CTS55 Getting Started With Manual Te st

Explanation:

e Maximum and Average Values

In this menu the actual, average and maximum phase and frequency measurem ents are displayed
for a given number of bur sts. T he ac tual num ber of bur sts us ed can be s elected with the "Number of
Samples" key.

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Getting Started With Manual Te st CTS55

6.4.1 BER Sensitivity measurement

This measurement is able to

measure a mobile’s receive
sensitivity which is defined as the
lowest "BS Signal" that allows the
BER measurement results to be
just within the configured
tolerances.

This measurement can be started
from the "Call Established" m enu
by activation of the BER
measurement. Either the "BER

BER Sensitivity Menu

Config BER Sensitivity Menu

Sensitivity" menu is entered
directly or it can be activated by
pressing the softkey labelled
"BER Sens." in the "Ber
Continuous" menu.

On entering the "BER Sensitivity"
menu the measurement will be
started automatically. The "BS
Signal" will be ramped down from
a configured initial value until the
sensitivity level is reached and
then the resulting "BS Signal"
value is displayed in the "BER
Sens." result field. The m easure­ment can be made again by
pressing the "Restart" softkey. A
measurement can be stopped
while in process by pressing the
"Stop" softkey and then restarted
by pressing the "Cont" softkey.

The "BER Sensitivity" configu­ration menu is ac cessible via the
main configuration menu as well
as via the measurement menu
itself.

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CTS55 Getting Started With Manual Te st

6.5 GPRS/BLER Measurements

The CTS-K4 software option is required in order to perform the GPRS/BLER tests.
The CTS provides the single slot GPRS Block Error Rate measurement and the indications of the

following Mobile-initiated procedures: GPRS Attach, GPRS Routing Area Update(RAU) and GPRS
Detach.

The GPRS/BLER operations will be perform ed only if the GPRS parameter in the Config GPRS/ Block
Error Rate menu is set to ON.

6.5.1 GPRS Attach

After a successf ul Location Update, if the GPRS param eter in Config GPRS/BLER screen is set to ON,
the Mobile initiated GPRS Attach operation is performed. It is indicated by the blinking text ‘GPRS
Attach in Progress’. The success of the GPRS Attach procedure is indicated by the checked ‘GPRS
Attached’ checkbox.

MS Test/Updated Menu after GPRS Attached

The BLER button is displayed on the MS Test/Updated screen after the GPRS Attach operation is
finished.

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Getting Started With Manual Te st CTS55

6.5.2 GPRS Block Error Rate

After pressing the "BLER" key in the MS Test/Updated Menu the Block Error Rate screen is
displayed. The Error Rate and the Data Rate values are calculated fr om the number of invalid blocks
reported to the CTS by the MS. These values are continuously updated.

GPRS Block Error Rate Menu

6.5.3 GPRS Detach

The GPRS Detach operation is initiated by the Mobile Phone(usually when it is switching off). It is
indicated by the blinking text ‘GPRS Detach in Progress’.

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CTS55 Module Test

7 Module Test

7.1 Overview

Module test is an o ptional facil ity (option B7) for the C TS which pro vides a new t est and an assoc iated
second RF connector. If the option is available this will be indicated on the "Available Options" menu.

The main purpose of Module Test is to allow measurements to be made of a mobile’s transmitted
signal. This is done without the associated signalling normally needed to get a mobile into a state where
a call has been esta blished . T his usual ly needs the m obile t o be i n a sp ecia l m ode, detai ls of which ar e
normally only available from the mobile manufacturer.

In Module Test there is also an RF generator available which transmits an RF signal. Many of the
characteristics of the signal are configurable by the user.

On the rear panel of the CTS ther e is an RF OUT connector (of type BNC). The output level at th is
connector is approx. 35 dB higher than the RF IN /OUT connector on t he front panel. T his connector is
intended for use with the RF generator facility.

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Module Test CTS55

7.2 Menu hierarchy

The diagram below shows the menu structure of Module Test, which is in addition to the standard
menus on the CTS.

Home

Module
Test

Config
Select

Con fig IQ
Spectrum

Conf.
Burst
Analysis

Conf.
Burst
Analysis

Config IQ
Spectrum

Power
Ramp

Config
Power

Burst
Analysis

Phase
Freq.

Config
Phase

RF
Signal
Gen.

IQ
Spectrum

RF
Signal
Gen.

Config IQ
Spectrum

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CTS55 Module Test

7.3 Starting Module Test

Home Menu

On entering Module Test via the test selection on the "Home" menu you are presented with a new
menu, "Module Test".

Module Test Menu

In the "Module Test" m enu the selection of the MS Type to be used can b e made by scrolling thr ough
the displayed list with the "MS Type" softke ys. The use of the defined attenuations m ay be turned on
and off with the "Coupler" softkey.

The "Select" softkey selects between two sub-tests, either "Burst Analysis" or "IQ Spectrum". The
"Start" softkey starts and the "Config" softkey enters the configuration menu of the selected sub-test.

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Module Test CTS55

7.4 Burst Analysis

7.4.1 Configuration

Conf. Burst Analysis Menu

The "Conf. Burst Anal ysis" menu is available via b oth the main configurati on menu and within Module
Test itself, from the "Module Test" menu. Configuration of the values is done by using the softkeys.

Trigger Mode
The CTS needs to detec t when a burst occurs . This c an be done ei ther by dete cting the risin g edge of

the burst (Power) or by synchronisation with the midamble (Free Run).
RF Unit

The receive frequency can be set on the "Burst Analysis" menu by entering it either as a channel
number or as a frequency. The unit used is selected by RF Unit.

SPM Offset

This is a calibration parameter for the Sensitive Power Measurement. The value can be set
automatically by usin g the Calibrate S PM button fr om the Burst Anal ysis menu. It also can be adj usted
manually.

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CTS55 Module Test

7.4.2 Running the Burst Analysis measurement

Burst Analysis Menu

Entering the "Burst Analysis" menu via the "Module Test" menu allows all the Burst Analysis
measurements to be made. The mobile should be put into its special test mode, in particular the
frequency of the m obile’s transmitted s ignal and the training s equence used will need to be specified.
When the mobile has been attached to the CT S and the CTS has been configur ed to use the same
parameters as the mobile’s transmitted signal the measureme nt results should appear.

While the CTS is sear ching for the mobile’s signal a sm all symbol (AR, standing for Auto Ranging) will
appear at the top of the menu. This symbol will disappear when the signal has been found and
measurements are being made.

Exp. Power

The power that you expect to be received by the CTS. This value aids the system’s search for the
signal.

Freq/RF Chan

The receive freque ncy can be s et either as a channel number or as a frequenc y (in steps of 0.2 MHz) .
The selection of which to use can be se t up in the "Config Bur st Analysis" menu. See section 7.7 for
information on the frequency ranges allowed.

Training Seq.

The training sequence expected to be received by the CTS from the mobile phone.

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Module Test CTS55

7.4.3 The Measurement Results

Apart from Peak Power the following measurement results are the same as made in Manual Test.

Freq Err.

The difference between the actual and expected received frequency of the input signal.
Phase Peak

The worst case phase error in the measured burst.
Phase RMS

The average (root mean square) of the phase error in the measured burst.
Peak Power

The maximum power of a burst received at the input.
Avg. Power

The average power of a burst received at the input.

Ramp

Indicates whether the power ram p received is within specified tolerances and if not possible re asons
why.

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CTS55 Module Test

7.4.4 Other Measurements

Using the "Select" sof tk ey followed b y "Start" ent ers a ne w m enu. Thes e new menus are f or the "Po wer
Ramp" measurem ent, the "Phase Frequenc y" measurem ent and control of the "RF Signal Gener ator".
The two measurem ents are described below. For details of the "RF Signal G enerator" menu refer to
section 7.6.

7.4.4.1 Power Ramp

Power Ramp Menu

The Power Ramp measurem ent is similar to that in Manual Test, as described in section 9.7.6. The
template configuration is tied to the Manual Test values.

Exp. Power

The power that you expect to be received by the CTS. This value aids the system’s search for the
signal.

Freq

This defines the receive frequency to use.
While the CTS is sear ching for the mobile’s signal a sm all symbol (AR, standing for Auto Ranging) will

appear at the top of the menu. This symbol will disappear when the signal has been found and
measurements are being made.

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Module Test CTS55

7.4.4.2 Phase Frequency

Phase Frequency Menu

The Phase Frequenc y m easur ement is similar to that in Manual T e st, as des cr ibe d in s ect ion 9.7.7. The
template configuration is tied to the Manual Test values.

Exp. Power

The power that you expect to be received by the CTS. This value aids the system’s search for the
signal.

Freq

This defines the receive frequency to use.
Ignore Guard/Eval Guard

A choice can be made whether Guard Bits are included in the phase frequenz evaluation.
While the CTS is sear ching for the mobile’s signal a sm all symbol (AR, standing for Auto Ranging) will

appear at the top of the menu. This symbol will disappear when the signal has been found and
measurements are being made.

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CTS55 Module Test

7.5 IQ Spectrum

7.5.1 Configuration

Config. IQ Spectrum Menu

The "Conf. IQ Spectrum " menu is available via both the m ain configuration menu and within Module
Test itself, from the "Module Test" menu. Configuration of the values is done using the softkeys.

Mode
Specifies whether the received signal will be bursting or a continuous wave.

Res. Bandwidth

The bandwidth of the filter used on the signal being measured.
Average

Specifies the number of complete m easur em ents that the IQ S pec tr um measurement res ult is aver age d
over.

Marker

Spot measurements of the power level at certain m arker frequencies can be m ade. This configurati on
turns these mark ers O N or OFF. If the markers are OFF the IQ Sp ec trum graph is expanded to f ill more
of the menu and the marker measurements are removed.

Marker centre dist.
The distance eith er side of the centre freque ncy of the m easurement at wh ich the spot m easurements

are made.
RF Unit

The receive frequenc y can be set on the "IQ Spectr um" m enu b y entering it either as a c hannel num ber
or as a frequency. The unit used is selected by RF Unit.

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Module Test CTS55

7.5.2 Running the IQ Spectrum measurement

IQ Spectrum Menu (with markers) IQ Spectrum Menu (without markers)

Entering the "IQ Sp ectrum " m enu via the "M odule T est" m enu allows t he IQ Spec trum measurem ent to
be made. The m obile sh ould be put into its s peci al tes t mode, in particular t he f r eq uency of the mobile’s
transmitted signal ne eds to be spec ified. W hen the mobile has been att ached to the CT S and the CTS
has been configured t o use the same param eters as the mobile’s trans mitted signal, the IQ Spec trum
graph should appear.

While the CTS is sear ching for the mobile’s signal a sm all symbol (AR, standing for Auto Ranging) will
appear at the top of the menu. This symbol will disappear when the signal has been found and
measurements are being made.

The "RF Generator" menu can be selected by pressing the "RF Gen" softkey.
Exp. Power

Enter here the po wer that you expect to be received b y the CTS. This val ue aids the s ystem’s search
for the signal.

Freq/RF Chan
The receive freque ncy can be s et either as a channel number or as a frequenc y (in steps of 0.2 MHz) .

The selection of which to use can be set up in the "Config. IQ Spectrum" m enu. See section 7.7 for
information on the frequency ranges allowed.

Marker Toggle
To toggle between markers in left/middle position and markers in middle/right position.

7.5.3 The Measurement Results

Ref. Pow.

The absolute (reference) power level of the top (0 dB) of the IQ Spectrum measurement graph.

M2, M1 a n d M3

These values show the frequencies of the markers and the absolute measured power levels at the
markers.

1-2, 2-3 and 1-3

The calculated differences between the various measured power levels at the markers.

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