User's Manual

Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 21 of 73
GSM ANTENNA REQUIREMENTS
Frequency Range
Standard Dual Band GSM/DCS frequency
range or Standard Quad Band GSM/DCS/OCS
frequency range if used for all four bands
Bandwidth
70 MHz in GSM850, 80 MHz in GSM &
170MHz in DCS & 140 MHz PCS band
Gain
< 3 dBi
Impedance
50 ohm
Input power
> 2 W peak power
VSWR absolute max
<= 10:1
VSWR recommended
<= 2:1
Table 6 – GSM Antenna requirements
3.4.5.4 Short Range Antenna Requirements
The short range antenna for GG864-2.4device shall fulfill the following requirements:
Short Ra
nge ANTENNA REQUIREMENTS
Frequency Range
2.4 GHz
Bandwidth
2.30 – 2.50 GHz
Gain
< 4 dBi
Impedance
50 ohm
VSWR recomme
nded
<= 1.5:1
Table 7 – Short Range Antenna requirements
3.4.6 Serial Port
The RS232 standard interface serves to connect a PC, Data Terminal Equipment (DTE) or an
application, witch acts as host controller of the SWS-GW with all its functions.
Serial port connects directly the host controller with the UART-Debug of the ARM chip of SWS-GW.
RS232 level translator is present on board.
3.4.6.1 RS232 standard interface connector
The connector mounted in the SWS-GW is a standard RS232 Sub-D 9pin female with these
characteristics:
 Baud rate from 300 to 115.200 bit/s
 Autobauding (300 to 38.400 bit/s)
Pin-out (refers to DTE side):
PIN Signal Description
1 - NC
2 RXD RX Output
3 TXD TX Input
4 - NC
5 GND GROUND
6 - NC
7 - NC
8 - NC