Karel GT20, GT10 Technical Reference And User's Manual
01/2003
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TECHNICAL REFERENCE AND USER'S GUIDE
GSM GATEWAY
TECHNICAL REFERENCE AND USER’S GUIDE REV A
GSM GATEWAY
TECHNICAL REFERENCE AND USER’S GUIDE REV A
GSM GATEWAY
Dear KAREL Installer,
CAUTION!
Since GT20 and GT10 GSM Gateways are electronic-based systems they contain modules
that carry high voltages, which could adversely affect environmental conditions. In this
regard, the requirements below should be fulfilled in order for your gateway not to
create any situation against you or the environment:
The device must not be disassembled by unauthorized
persons in any way.
The cover of the gateway cabinet should always be kept
closed.
Prior to hanging the gateway on the wall, one should
make sure screws are not defective.
In order to maintain sound operation of the system, make sure the requirements
below, which are related to the environment in which the gateway will be installed, are
fulfilled.
♦ Make sure the upper screw by which the exchange will be hanged is at least 150 cm.
above the floor.
♦ Have your exchange installed in places, which are not exposed to direct sunlight,
and not humid, with an environmental temperature of 0-40oC and which should be
ventilated well. There should be a practical lighting in the room. The gateway should not
be exposed to effects of dust, vibration, oil and water.
♦ Devices that generate high frequency waves (such as welding machines, office
equipment such as computers and telex machines, air conditioners, TV sets) should not
be in the same room if possible, and they should be at least 3 meters away from the
gateway, otherwise.
♦ This module should be installed in a location inside the building but close to outer
walls, where GSM telephone network broadcast is received powerfully. In case lines
of different GSM operators are employed, signal levels for both of them should be
checked.
♦ Since frequently interrupted mains supply would affect normal operation of the
system, take care in making the power connection of the system special for the system.
Precautions must be taken in order to prevent any harmful
substances from leaking or spilling into the gateway or its
power adaptor in any way.
Failure in fulfilling those requirements may result in vital hazards!
GT20-10 TTMK/ÝNG - REV A 30/01/2003
KAREL reserves the right to make modifications in product features mentioned in this
document for development and improvement purposes, without prior notice. Individual
products may possess characteristics different from those mentioned in this document,
according to their software and hardware versions.
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TECHNICAL REFERENCE AND USER’S GUIDE REV A
GSM GATEWAY
PREFACE
Chapters in this guide have been prepared in order to present detailed technical
information to people who need hardware-based information about the GT20 and GT10
GSM Gateways, information about installation of the gateway, settings that could be done
through programming and troubleshooting simple problems. By this way, one could
understand abilities of the gateway, how it will be operated in accordance with customer
demands and things that should be done in order to operate it with full performance.
The first two sections - “Technical Introduction and Technical specifications” - They
contain technical information about hardware and software structures of the device.
Information in these chapters, for which knowledge in mechanics, electricity and
electronics may be prerequisite, aims to introduce structure of the gateway. Presentation
of the information in this chapter follows a path from the whole of the gateway down to
the details of parts. At the end, technical data have been listed in a table as summary.
The third section - “Installation” - This chapter tells about the installation methods of the
gateway. This chapter definitely must be read before the installation by the personnel
who will perform the installation of the gateway.
The fourth section - “Programming” - This chapter gives information about the program
parameters, which would enrich functions of the gateway and which could be applied to
meet daily communication needs of customers more comprehensively.
Last section - “Troubleshooting” This is a chapter that suggests simple solution methods
to some problems that could occur in orderly operation of the gateway. Solution
suggestions that are specified in this chapter can be applied by the authorized personnel
only.
TECHNICAL INTRODUCTION:.............................................................................................1
CONTENTS
INTRODUCTION:................................................................................................................1
GENERAL MODULE FEATURES:.......................................................................................2
PART LIST ON DELIVERY:...............................................................................................2
POWER SUPPLY:................................................................................................................3
GT20 AND GT10 motherboard:........................................................................................4
LED DISPLAY:......................................................................................................................5
TECHNICAL SPECIFICATIONS:.............................................................................................7
INSTALLATION:............................................................................................................................9
PREPARATION:.....................................................................................................9
APPLICATION:..............................................................................................10
PS03 POWER ADAPTOR CONNECTION:..........................................................................12
PLACING THE SIM CARDS:.............................................................................................14
TELEPHONE OR EXCHANGE EXTERNAL LINE CONNECTION
EXTERNAL ANTENNA CONNECTIONS:...........................................................................16
PROGRAMMING:........................................................................................................17
Putting the GSM Module into Programming Mode:......................................................18
Taking the GSM Module Out Of Programming Mode:............................................18
Automatic PIN Code Entry:............................................................................................18
Caller ID Information:.....................................................................................................19
Caller ID Standard:........................................................................................................19
Usage of the key #:.....................................................................................................19
Usage of the key *:.....................................................................................................20
CLIP Information Transmission:...................................................................................20
Resetting Memory Tables:............................................................................................20
Call Initiation Period:.....................................................................................................21
GSM Speed Dial Memory:.................................................................................................21
Erasing Numbers From The GSM Speed Dial Memory:.................................................21
Incoming Voice Level:....................................................................................................22
Outgoing Voice Level:.....................................................................................................22
Unconditional Call Forwarding:.....................................................................................22
Number Entry For Unconditional Call Forwarding:....................................................22
Number Erasure For Unconditional Call Forwarding:................................................22
Call Forwarding On Busy:..............................................................................................23
Number Entry For Call Forwarding On Busy :.............................................................23
Number Erasure For Call Forwarding On Busy:..........................................................23
Call Forwarding On No Answer:......................................................................................23
Number Entry For Call Forwarding On No Answer:......................................24
Number Erasure For Call Forwarding On No Answer:................................................24
Call Forwarding In Unreachable Status:...........................................................................24
Number Entry For Call Forwarding In Unreachable Status:....................................24
Number Erasure For Call Forwarding In Unreachable Status:....................................24
:.......................................15
III
UTILIZATION:................................................................................................................25
TROUBLESHOOTING:............................................................................................26
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TECHNICAL REFERENCE AND USER’S GUIDE REV A
TECHNICAL INTRODUCTION
INTRODUCTION
GT20 and GT10 GSM Gateways are modules that provide saving in communication costs
by connecting to the external lines of telephone exchanges and enable the users make
their GSM calls over GSM network.
GT20/GT10 can be used in environments where the local telephone operator has no
permanent lines or mobile environments (such as construction sites, mobile office
applications, etc.) in order to meet the communication needs over GSM network or
maintain GSM line connection for the telephone exchange over its external lines.
GT10 consists of one GSM module. GT20 has two GSM modules on which you can use the
SIM cards of a single service provider or of two different service providers.
GT20/GT10 is fully compatible with all KAREL PABX systems and in addition it can be
used with any PABX of any brand.
GSM GATEWAY
GENERAL MODULE FEATURES
GT20/GT10 consists of an electronic card that is presented in a plastic box, a power
supply that will be used for feeding that card and antenna(s) that will provide GSM signal
transmission.
GT20 contains two GSM modules. By this way, two GSM conversations can be made over
the module. Since the GSM modules that are in the GT20 possesses dual-band feature,
they can operate both in 900 Mhz. and 1800 Mhz. SIM cards of the same or different GSM
operators can be installed in these modules.
Structure of GT10 resembles that of GT20, however, it contains only one GSM module.
GT20 has two analog connection circuits that will be connected to the external lines
of an exchange or directly to the telephones. These analog circuits have a structure
that resembles extension circuit of telephone exchange and provides 48 VDC feed. By
this way, GT20 can be employed either by being connected to the external lines of any
telephone exchange or directly to two telephones.
GT10, on the other hand, can be employed either by being connected to an
external line of a telephone exchange or directly to a telephone, since it has
only one channel. The analog circuit it has provides it with 48 VDC feed.
Signaling may be DTMF (tone pulse) in the external lines of the telephone or the
exchange that will be connected to GT20/GT10. Since the DP signaling is not supported
by GT20/GT10, telephones or exchange external lines that has DP signaling cannot be
connected to GT20/GT10.
Appearances of GT20 is as follows.
Figure-1
As well as providing cost savings for GSM calls that the extensions of the exchange to
which it has been connected, GT20/GT10 also provides savings for the parties calling the
exchange over a GSM network. GT20/G10 forwards the external calls to the exchange for
the calls made over the GSM line on GT20/G10. During that forwarding, it also transmits
the CLIP information (number of the caller) to the exchange in Caller ID format upon wish.
GT20/GT10 has a structure that enables it to generate Caller ID information both in ETSI
and Bellcore standards and in FSK format. The selection between these standards are
made through programming (It has been explained in detail in next chapter.)
PART LIST ON DELIVERY
The GT20 Module includes the parts below:
1) GT20 GSM Gateway
2) PS03 Power Adaptor
3) Two External GSM Antenna
4) Mounting Template
5) Technical Reference and User’s Guide
The GT10 Module includes the parts below:
1) GT10 GSM Gateway
2) PS03 Power Adaptor
3) One External GSM Antenna
4) Mounting Template
5) Technical Reference and User’s Guide
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TECHNICAL REFERENCE AND USER’S GUIDE REV A
GSM GATEWAY
POWER SUPPLY
The GT20/GT10 power supply - PS03 -, is an external power supply that has been
designed to operate on 230 VAC /50 Hz. mains supply. This adaptor turns the mains
supply into 48 VDC and transfers to GT20/GT10 via the corresponding connector.
GT20/GT10 turns the 48 VDC it has received from the adaptor to + 5 VDC, -48 VDC and 67
Vrms ring signal by the power-processing unit it includes.
Appearance of the PS03 power adaptor is seen in the figure below:
GT20 AND GT10 MOTHERBOARD
The GT20 motherboard is a card that contains on it two GSM modules, two SIM card
ports, two extension units, power processing unit, interfaces for connections, two external antenna inputs, processor that controls functions of all those units and auxiliary circuits. See the figure below for circuit locations.
S1: SIM slot for GSM module 1,
G1: GSM module 1,
A1: Analog extension for GSM module 1,
S2: SIM slot for GSM module 2,
G2: GSM module 2,
A2: Analog extension for GSM module 2,
C: Computer interface (reserved for
future use),
L: LED card,
P: Power circuitry,
Figure-3
The GT10 motherboard is a card that contains on it one GSM module, one SIM card
port, one extension unit, power processing unit, interfaces for connections, one external
antenna input, processor that controls functions of all those units and auxiliary circuits.
See the figure below for circuit locations.
Dimensions of PS03 are 11 cm. x 6 cm. x 8 cm. and it weighs 0.2 kg.
Figure-2
3
S1: SIM slot for GSM module 1,
G1: GSM module 1,
A1: Analog extension for GSM module 1,
C: Computer interface (reserved for
future use),
L: LED card,
P: Power circuitry,
Figure-4
Besides, there is a LED group which can be seen from outside even when the plastic
cabinet is closed and which gives information about the operation of the module to the
users. Order of the 5 LEDs that are on the motherboard and their functions have been
given in the foolowing section:
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