How GSM Modem works

A GSM modem is explained as a specified modem type that can accept a SIM card just like a mobile phone and operateĀ  on a subscription to a network of mobile data transfer. Looking from the angle of a mobile network operator a GSM modem is just another version of the mobile phone.

This is a wireless modem, which behaves quiet like a dial-up internet modem. The major difference between the two is that while data is sent and received via a fixed phone line with a dial up modem, a GSM modem sends and receives data in the form of radio waves.

This can either be a PC/PCMCIA card or an external device. Generally, an external GSM modem gets connected to a PC using a USB cable or a serial cable. A PCA/PCMCIA card GSM modem is designed for using with a laptop. A GSM modem in the form of a PC card can be inserted into one of the laptop’s card slots.

A GSM modem too, much like a GSM mobile phone, requires a wireless carrier’s SIM card to operate.

GSM and dial up modems support a general set of AT commands that are used by computers to control modems. This allows the user to use a GSM modem just like a dial up internet modem. Additionally to the standard AT commands, an extended list of AT commands too have been defined in the GSM standards.

These extended AT commands allow the user to read write or delete short messages, send SMS, monitor the signal strength, monitor the battery charge level and charging status and read, write and search phone book entries.

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