Specifications

Chapter 4 – Interfaces
Wireless ModemModule GSM/GPRS Developer’s Guide 34
RF Interface
The impedance is 50 Ohms nominal.
RF Connector
The RF connector is MMCX standard type. An antenna can be directly connected through the mating connector
or using a small adapter.
RF Performances
RF performances are compliant with the ETSI recommendation 05.05 and 11.10.
The main parameters are:
Receiver:
• EGSM Sensitivity : < -104 dBm
• GSM 1800/GSM 1900 Sensitivity : < -102 dBm
• Selectivity @ 200 kHz : > +9 dBc
• Selectivity @ 400 kHz : > +41 dBc
• Dynamic range : 62 dB
• Intermodulation : > -43 dBm
• Co-channel rejection : + 9 dBc
Transmitter:
• Maximum output power (EGSM) : 33 dBm +/- 2 dB
• Maximum output power (DCS/PCS) : 30 dBm +/- 2 dB
• Minimum output power (EGSM): 5 dBm +/- 5 dB
• Minimum output power (DCS/PCS): 0 dBm +/- 5 dB
• H2 level : < -30 dBm
• H3 level : < -30 dBm
• Noise in 925 - 935 MHz : < -67 dBm
• Noise in 935 - 960 MHz : < -79 dBm
• Noise in 1805 - 1880 MHz : < -71 dBm
• Phase error at peak power : < 5 ° RMS
• Frequency error : +/- 0.1 ppm max
DTE/DCE Interface Rates
The table below indicates the anticipated modem-to-computer interface rates for both the 7.2 bits-per-sample
rate and the 8 bits-per-sample rate.
Table 4-2: Projected DTE/DCE Interface Rates for 7.2/8K Hz Sample Rates
Bits per Sample
Projected DTE/DCE I/F
Rate @ 7.2K Hz
Projected DTE/DCE I/F
Rate @ 8K Hz Sample Rate
0.50 4800 9600
1 9600 19200
2 19200 19200
3 38400 38400
4 38400 57600
5 57600 57600
6 57600 115200
7 115200 115200
8 115200 115200
9 115200 115200
10 115200 115200
11 115200 115200
12 115200 Fast
13 Fast Fast