SIM900D Hardware Design
Frequency Bands
z
SIM900D Quad-band: GSM 850, EGSM 900, DCS 1800, PCS 1900. The
SIM900D can search the 4 frequency bands automatically. The frequency
bands also can be set by AT command.
z
Compliant to GSM Phase 2/2+
GSM class
Small MS
Transmitting power
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Class 4 (2W) at GSM 850 and EGSM 900
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Class 1 (1W) at DCS 1800 and PCS 1900
GPRS connectivity
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GPRS multi-slot class 10
（
default
）
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GPRS multi-slot class 8 (option)
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GPRS mobile station class B
Temperature range
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Normal operation:
-30°C to +80°C
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Restricted operation: -40°C to -30°C and +80 °C to +85°C
(1)
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Storage temperature -45°C to +90°C
DATA GPRS:
CSD:
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GPRS data downlink transfer: max. 85.6 kbps
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GPRS data uplink transfer: max. 42.8 kbps
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Coding scheme: CS-1, CS-2, CS-3 and CS-4
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Supports the protocols PAP (Password Authentication Protocol) usually used
for PPP connections.
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Integrates the TCP/IP protocol.
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Support Packet Switched Broadcast Control Channel (PBCCH)
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CSD transmission rates: 2.4, 4.8, 9.6, 14.4 kbps, non-transparent
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Unstructured Supplementary Services Data (USSD) support
SMS
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MT, MO, CB, Text and PDU mode
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SMS storage: SIM card
FAX
Group 3 Class 1
SIM interface
Support SIM card: 1.8V, 3V
External antenna
Antenna pad
Audio features
Speech codec modes:
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Half Rate (ETS 06.20)
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Full Rate (ETS 06.10)
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Enhanced Full Rate (ETS 06.50 / 06.60 / 06.80)
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Adaptive multi rate (AMR)
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Echo Cancellation
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Noise Suppression
Serial port and
Debug port
Serial Port:
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7-wire modem interface with status and control lines, unbalanced,
asynchronous.
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1.2kbps to 115.2kbps.
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Serial Port can be used for AT commands or data stream.
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Supports RTS/CTS hardware handshake and software ON/OFF flow control.
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Multiplex ability according to GSM 07.10 Multiplexer Protocol.
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Autobauding supports baud rate from 1200 bps to 57600bps.
SIM900D_HD_V1.02
09.04.2010
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