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Wireless Modems

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About Wireless Modems

Wireless modems transmit modulated data using electromagnetic waves.  This grouping includes radio modems ad access points.  Radio modems are radio frequency transceivers for serial data.  They connect to a serial port (RS232, RS422, etc.) and transmit to and receive signals from another matching radio modem.  Access point enables wireless network connectivity. A modem (Modulator-Demodulator) is a device or program that enables a computer to transmit data over telephone lines. Computer information is stored digitally, whereas information transmitted over telephone lines is transmitted in the form of analog waves. A modem converts between these two forms.

General specifications that are important to consider when searching for wireless modems include form factor, modem speed, network type, and bus or interface type.  From the point of view of the form factor there are two basic types of modems: internal modem are computer cards that are installed in a slot of the motherboard of a computer; an external modem is a module that attaches to computer's communications port via a cable.  Modem speed is the maximum data transfer rate at which the modem can deliver data. It is normally expressed in bits/second.  Choices for network type for wireless modems include dial-up, Ethernet, AMPS, CPCD, GSM, ISDN, PAN, and GPRS.  Common bus or interface types include Type II card, Type III card, CardBus, ISA, PCI, FireWire (IEEE 1394), MIC, RJ-45, SC, ISDN BRI S/T interface, ISDN BRI U interface, serial ports (RS232, RS422, RS485), ST, USB, and PLC slot mount. 

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Products & Services Related to Wireless Modems

Access Points
Access points are transmitter / receivers (transceivers) that connect to a network through an interface such as a bus or connector. They receive, store, and transmit data between the wireless LAN and the wired structure.
Network Modems
Network modems (modulators-demodulators) are devices or programs that allow computers to transmit data over telephone lines. They convert digital computer data to analog sound waves and then demodulate the carrier signals to decode the transmitted information.
Radio Modems
Radio modems are radio frequency transceivers for serial data. They connect to serial ports (RS232, RS422, etc.) and transmit to and receive signals from another matching radio modem.

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Part Numbers for Wireless Modems

Part # Distributor Manufacturer Product Category Description
CR-SE Series Automationdirect.com Not Provided Wireless Modems Unique ?frequency skip? setting to avoid 802.11 wireless ethernet LANs
XEB09-BCS Digi-Key Digi International Computer and Video Accessories MODEM ETHERNT MPT BRDGE COMM
XT09-PKI-E Digi-Key Digi International/Maxstream Computer and Video Accessories MODEM RF 900MHZ 1W ETHER
XT09-PKC-UA-NA Digi-Key Digi International/Maxstream Computer and Video Accessories MODEM RF 900MHZ 1W USB INT
XT09-4II-RA-NA Digi-Key Digi International/Maxstream Computer and Video Accessories MODEM RF 900MHZ RS232/485 NEMA 4

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