M20 Hardware Design
Alarm function Programmable via AT command
Physical characteristics Size:
35±0.15 x 32.5±0.15 x 3.1±0.3mm (including connector)
35±0.15 x 32.5±0.15 x 2.95±0.2mm (excluding connector)
Weight: 5.5g
Firmware upgrade Firmware upgrade over Serial Port 0
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1
When the module works in this temperature range, the deviations from the GSM specification
might occur. For example, the frequency error or the phase error could increase.
Table 4: Coding schemes and maximum net data rates over air interface
Coding scheme 1 Timeslot 2 Timeslots 4 Timeslots
CS-1: 9.05kbps 18.1kbps 36.2kbps
CS-2: 13.4kbps 26.8kbps 53.6kbps
CS-3: 15.6kbps 31.2kbps 62.4kbps
CS-4: 21.4kbps 42.8kbps 85.6kbps
2.2 Functional diagram
The following figure shows a block diagram of the M20 module and illustrates the major
functional part:
z The GSM baseband engine
z Flash and SRAM
z The GSM radio frequency part
z The antenna interface
z The B2B interface
—SIM card interface
—Audio interface
—UART interface
—Power supply
—DAI interface
M20_HD_V1.01 - 16 -
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