User manual

14
Output Power:
2 Watt Peak (Class 4) GSM900/850
1 Watt Peak (Class 1) GSM1800/1900
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
Table 6: Recommended antenna parameters
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