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Overview of CDMA modems
Introduction
A CDMA modem is a wireless modem that works with CDMA networks.
A wireless modem behaves like a Hayes compatible dial-up modem.
The main difference between a standard Hayes modem and a CDMA modem is that a hayes modem sends and receives data through a fixed telephone line while a CDMA modem sends and receives data through radio waves.
A CDMA modem can be an external unit or a PCMCIA card (also called PC Card).
An external CDMA modem is connected to a PC through a serial cable, a USB cable, Bluetooth or Infrared.
Unlike GSM modems, CDMA modems and phones do not require a SIM card from a wireless carrier in order to operate.
CDMA modems are activated by the network once you subscribe to a CDMA service provider.
PC's use AT commands to control a modem.
CDMA modems and normal Hayes modems support a common set of AT commands.
You can use a CDMA modem just like a hayes compatible modem.
CDMA modems support an extended set of AT commands, please note that not all CDMA modems use the same commands for sending SMS !
These extended AT commands are defined in the CDMA 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 CDMA modem is pretty low, approx six messages per minute.
List of CDMA wireless modems
MultiTech MultiModem CDMA Wireless Modem »
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Hardware
GSM/GPRS Modems
Software