Specifications

PART 2 – Cellular SocketModems Chapter 5 – SocketModem iCell HSPA
Multi-Tech Systems, Inc. Universal Socket Hardware Guide for Developers (S000342P) 93
Application Notes
LED Interface
The LED signal is used to indicate the working status of the SocketModem.
LED 1 – Heartbeat LED – Available for -IP and -GP Builds
LED 1 Signal
Heartbeat LED
OFF
No power to the unit
Blinking
Power on
LED 2 – Link Status – Available for All Builds
LED 2 Signal
Link Status LED
OFF
No power to the unit
Continuously Lit
Powered and connected, but not transmitting or receiving
Slow Blink (-0.2 Hz)
Powered and searching for a connection
Faster Blink (-3 Hz)
Transmitting or receiving
LED 3 – Signal Strength – Available for -IP and -GP Builds
LED 3 Signal
Signal Strength LED
OFF
No signal
Blinking
The faster the LED blinks, the stronger the signal. The
range for the blink rate is from -0.5Hz to -10Hz.
LED 4 – GPS Status – Available for -GP Build
LED 4 Signal
GPS Status LED
OFF
No power to the unit
Continuously Lit
Satellite not acquired
Blinking
Satellite acquired
RF Performances
RF performances are compliant with the ETSI recommendation 05.05 and 11.10.
The main parameters are:
Receiver Features
• EGSM Sensitivity: < -108 dBm
• GSM 1800/GSM 1900 Sensitivity: < -107 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): 24 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