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Overview of GSM/GPRS Modems
Introduction
A GSM modem is a wireless modem that works with GSM networks.
A wireless modem behaves like a Hayes compatible dial-up modem.
The main difference between a standard Hayes modem and a GSM modem is that a hayes modem sends and receives data through a fixed telephone line while a GSM modem sends and receives data through radio waves.
A GSM modem can be an external unit or a PCMCIA card (also called PC Card).
An external GSM modem is connected to a PC through a serial cable, a USB cable, Bluetooth or Infrared.
Like a GSM mobile phone, a GSM modem requires a SIM card from a wireless carrier in order to operate.
PC's use AT commands to control a modem.
GSM modems and normal Hayes modems support a common set of AT commands.
You can use a GSM modem just like a hayes compatible modem.
GSM modems support an extended set of AT commands.
These extended AT commands are defined in the GSM standards. With the extended AT commands, you can do things like:
- Read, write and delete SMS messages.
- Send SMS messages.
- Monitor the signal strength.
- Monitor the charging status and charge level of the battery.
- Read, write and searche phone book entries.
The number of SMS messages that can be processed by a GSM modem is pretty low, approx six messages per minute.
A GPRS modem is a GSM modem with additional support for GPRS technology for data transmission.
GPRS means: 'General Packet Radio Service'. It is based on a packet-switched technology, as an extension to GSM (note thatGSM is a circuit-switched).
An advantage of GPRS over GSM is that GPRS has a much 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 SMS over GSM.
A GPRS modem is required to send and receive SMS via GPRS. Some wireless carriers do not support the sending and receiving of SMS via GPRS.
A GPRS modem is typically required for MMS.
List of GSM/GPRS wireless modems
Duxbury 120S Terminal »
Duxbury 180S Terminal »
Duxbury 120M Terminal »
Duxbury 180M Terminal »
Siemens M20 Terminal »
Siemens TC35 Terminal »
Siemens MTC45MC and MTC45TC Terminal »
Siemens TC65 GSM Modem »
Siemens ES75 EDGE GSM Modem »
WaveCom Fastrack M1306B GSM Modem »
WaveCom Integra M2106B GSM Modem »
WaveCom m-track 25 »
MultiTech MultiModem GPRS Wireless Modem »
Falcom Samba Dual Band GSM/GPRS Modem »
Falcom Tango Dual Band GSM/GPRS Modem »
Falcom Twist GSM/GPRS Modem »
Audiotel Industrial GSM/GPRS Modem »
Audiotel Industrial RTU GSM/GPRS Modem »
eDbox300 GPRS/GSM Terminal »
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Hardware
GSM/GPRS Modems
Software