CEP AG
Revision 1.2
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Page 11 of 28
2 Watt Peak (Class 4)
GSM900/850
1 Watt Peak (Class 1)
GSM1800/1900
Description of recommended antenna parameters:
The antenna that the customer chooses to use should fulfil the following
requirements:
Frequency range
Quad Band
GSM 850/900 MHz
GSM 1800/1900 MHz
Depending by frequency band(s) provided by
the network operator, the customer shall use
the most suitable antenna for that/those band(s)
Bandwidth
80 MHz in EGSM 900, 70 MHz if GSM 850,
170 MHz in DCS, 140 MHz PCS band
Gain
> 1.5 dBi
Impedance
50 ohm
Input power
> 2 W peak power
VSWR absolute max.
10:1
VSWR recommended
<= 2:1
2.4 SIM card reader
The GT864-QUAD/PY Terminal is fitted with a SIM card reader designed for 3V SIM
cards. It is the flip-up type which is lockable in the horizontal position and is accessed
through a removable panel.
2.5 RS232 Serial Port
The modem supports a standard RS232 serial interface (EIA/TIA 574) via its 9 pin
Sub-D connector, shown below. In line with serial communication terminology the
GT864-QUAD/PY Terminal should be considered as the
data circuit-terminating
equipment
(DCE) and the external application or computer as the
data terminating
equipment
(DTE). The maximum baud rate to communicate with the GT864 Terminal
is 230,4 kbit/s.
The electrical characteristics of the serial port signals are shown below:
PIN
Signal
Direction
Voltage levels
Description
1
DCD
Output
> + 4V
<- 4 V
Data carrier detect
2
RD
Output
> + 4V
<- 4 V
Received data
3
TD
Input
> + 2,4V
< 0.8 V
Transmitted data
4
DTR
Input
> + 4V
< 0.8 V
Data terminal ready
