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GSM Modem

A GSM modem is a wireless modem that works with a GSM wireless network. A wireless modem behaves like a dial-up modem. The main difference between them is that a dial-up modem sends and receives data through a fixed telephone line while a wireless modem sends and receives data through radio waves.

A GSM modem can be an external device or a PC Card / PCMCIA Card. Typically, an external GSM modem is connected to a computer through a serial cable or a USB cable. A GSM modem in the form of a PC Card / PCMCIA Card is designed for use with a laptop computer, a GSM modem requires a SIM card from a wireless carrier in order to operate.

Both GSM modems and dial-up modems support a common set of standard AT commands. You can use a GSM modem just like a dial-up modem. In addition to the standard AT commands, GSM modems support an extended set of AT commands. These extended AT commands are defined in the GSM standards.

GPRS Modem

A GPRS modem is a GSM modem that additionally supports the GPRS technology for data transmission. GPRS stands for General Packet Radio Service. It is a packet-switched technology that is an extension of GSM. (GSM is a circuit-switched technology.) A key advantage of GPRS over GSM is that GPRS has a higher data transmission speed.

GPRS can be used as the bearer of SMS. If SMS over GPRS is used, an SMS transmission speed of about 30 SMS messages per minute may be achieved. This is much faster than using the ordinary SMS over GSM, whose SMS transmission speed is about 6 to 10 SMS messages per minute. A GPRS modem is needed to send and receive SMS over GPRS. Note that some wireless carriers do not support the sending and receiving of SMS over GPRS. If you need to send or receive MMS messages, a GPRS modem is typically needed.


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arrow Module Tri band GSM 900/1800/1900 Mhz
* Quad band GSM 850/900/1800/1900 MHz
arrow Output Power Class 4 (2W for GSM 900)
Class 1 (1W for GSM 1800)
arrow SIM Interface External SIM 1.8V & 3V
arrow SMS Supports Text and PDU mode
arrow Data Data circuit Asynchronous and non transparent upto 14.4 kbps
arrow Fax Automatic PC fax group 3 (Class 1 or Class 2)
arrow GPRS Packet Data Feature Class 10; Coding Scheme CS1 to CS4,
Embedded TCP/IP Stack (Triband module only)
arrow AT Commands Interface GSM 07.05 and 07.07
arrow Connectors/Switches RS-232 Serial UBS (optional)
SIM Card Holder
DC power connector
SMA Antenna connector
arrow Power Supply Input 6 - 30V DC (with reverse connection protection)
arrow Temperature Operating: --10°C ~ +50°C
arrow Antenna * SMA Rubber / WHIP / Yagi Antenna
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