TECHNICAL REFERENCE AND USER’S GUIDE
REV A
GSM GATEWAY
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.
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.)
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
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.
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.
1
Figure-1
2
GENERAL MODULE FEATURES
PART LIST ON DELIVERY
