Multitech MTSMC-G1, Hardware Manual

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Chapter 1 – SocketModem GSM
Multi-Tech Systems, Inc. SocketModem GSM Hardware Guide for Developers 10
LED Indicators
The LEDs are used to indicate the working mode of the SocketModem. The LS LED indicates
Network Link Status and Network Strength
Network – defined by WMP100
Signal What Is Indicated
Off Processor Off
On Processor On – Not registered on the network
Slow Flash (on 200ms, off 2s) Registered on network
Quick flash (on 200ms, off 600ms) Registered on the network – Communication in
progress
Very quick flash (on 100ms, off 200ms) Bad software; software is bad or not compatible
Signal Strength
Signal What Is Indicated
Off Processor off or modem not registered on network
On Good GSM signal (RSSI >= 12)
Quick flash (on 200ms, off 600ms) Weak GSM signal (7 <= RSSI < 12)
Very quick flash (on 100ms, off 200ms) Very weak or no GSM signal (RSSI < 7)
RF Interface
Radio Characteristics
GSM 850 EGSM 900 GSM 1800 GSM 1900
Frequency RX 869 to 894 MHz 925 to 960 MHz 1805 to 1880 MHz 1930 to 1990 MHz
Frequency TX 824 to 849 MHz 880 to 915 MHz 1710 to 1785 MHz 1850 to 1910 MHz
RF Power
Stand 2W at 12.5% duty
cycle 2W at 12.5% duty
cycle 1W at 12.5% duty
cycle 1W at 12.5% duty
cycle
Impedance 50 ohms
VSWR <2
Typical Radiated Gain 0 dBi on azimuth plane
RF Performances
RF performances are compliant with the ETSI recommendation 05.05 and 11.10.
The main parameters are:
Receiver Features
•
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 Features
•
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
RF Connection
The RF connector on the SocketModem GSM is a UFL standard type. An antenna can be directly
connected through a mating UFL to SMA adapter.