User guide
Table Of Contents
- Presentation
- Warning
- Copyright
- 1 References
- 2 Packaging
- 3 General presentation
- 4 Characteristics and Services
- 5 Use of the modem
- 5.1 Starting with the modem
- 5.2 Specific recommendations for the use of the modem in vehicles
- 5.3 GSM led of the modem
- 5.4 Echo function of AT commands deactivated
- 5.5 Checking the quality of the GSM reception signal
- 5.6 Verification of PIN code
- 5.7 Verification of modem registration on GSM network
- 5.8 Verification of modem registration on GPRS network
- 5.9 Verification of internal voltages of the modem
- 5.10 Main AT commands (HAYES)
- 5.11 Turning OFF the modem
- 5.12 Updating procedure of the modem
- 6 Trouble Shooting
- 7 Functional description
- 8 Technical characteristics
- 8.1 Mechanical characteristics
- 8.2 Electrical characteristics
- 8.3 Environmental characteristics
- 8.4 Standards/Conformities
- 9 Security recommendations
- 10 Recommended accessories
- 11 Client support
EG_GenPro25e_1055_UG_000_UK Page 61 / 66
Descriptions and non-contractual illustrations in this document are given as an indication only.
ERCO & GENER reserves the right to make any modification.
Dct_427_01
8.2.8 RF GSM/DCS characteristics
8.2.8.1 RF functioning
The RF functioning complies with the recommendation ETSI GSM Standard.
The RF performances for the receiver and the transmitter are described below.
Table 43 : Parameters of RF receiver and transmitter
Receiver
Sensitivity in 850/900 @ 25 °C - 110 dBm, GPRS Coding Scheme 1 (CS1)
Sensitivity in 1800/1900 @ 25 °C - 109 dBm, GPRS Coding Scheme 1 (CS1)
Transmitter
Maximum power (Power Class4 - 850/900)
at ambient temperature
33 dBm +/- 2 dB @ antenna connection
Maximum power (Power Class1 - 1800/1900)
at ambient temperature
30 dBm +/- 2 dB @ antenna connection
8.2.8.2 GSM external antenna
The GSM external antenna is connected to the modem via the SMA female connector
The external antenna must have the characteristics described in the table below.
Table 44 : Characteristics of the GSM external antenna
Frequency band
GSM 900
880..960 MHz
GSM 1800
1710..1880 MHz
GSM 850
824..894 MHz
GSM 1900
1850..1990 MHz
Impedance
50 Ohms nominal
Input power
> 2 W peak
Gain
< 3 dBi
VSWR
< 2:1 recommended < 3:1 acceptable
Return Loss
S
11
<-10 dB recommended S
11
<-6 dB acceptable
See § 10
Recommended accessories , for the GSM antennas recommended by ERCO &
GENER.