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M20 Hardware Design
GPRS connectivity
Temperature range
DATA GPRS
CSD
SMS
FAX
SIM interface
Antenna interface
Audio feature
Serial Interface
Phonebook management
SIM Application Toolkit
Real time clock
M20_HD_V1.01
Class 1 (1W) at DCS 1800 and PCS 1900
GPRS multi-slot class 12 (default)
GPRS multi-slot class 10 (option)
GPRS multi-slot class 8 (option)
GPRS mobile station Class B
Normal operation: -35°C ~ +80°C
Restricted operation: -45°C ~ -35°C and +80°C ~ +85°C ○
Storage temperature: -45°C ~ +90°C
GPRS data downlink transfer: max. 85.6 kbps
GPRS data uplink transfer: max. 85.6 kbps
Coding scheme: CS-1, CS-2, CS-3 and CS-4
Support the protocols PAP (Password Authentication Protocol)
usually used for PPP connections
Integrate the TCP/IP protocols
Support Packet Switched Broadcast Control Channel (PBCCH)
CSD transmission rates: 2.4, 4.8, 9.6, 14.4 kbps,
non-transparent
Support Unstructured Supplementary Services Data (USSD)
MT, MO, CB, Text and PDU mode
SMS storage: SIM card
Group 3 Class 1
Support SIM card: 1.8V, 3V
Connect via 50Ω antenna connector or antenna pad
Speech codec modes:
Half Rate (ETS 06.20)
Full Rate (ETS 06.10)
Enhanced Full Rate (ETS 06.50 / 06.60 / 06.80)
Adaptive Multi-Rate (AMR)
Echo Cancellation
Echo Suppression
Noise Reduction
Serial Port 0:
Seven lines on Serial Port 0
Use for AT command, GPRS data and CSD data
Support multiplexing function
Support baud rate from 75 bps to 115200 bps
Support Autobauding from 4800 bps to 115200bps
Serial Port 1:
Software debug function
Two data lines RXD1 and TXD1
Support phonebook types: SM, FD, LD, RC, ON, MC
Support SAT class 3, GSM 11.14 Release 99
Implemented
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