From Introduction to EVDO: Physical Channels, Logical Channels, Network and Operation

EVDO devices (also called access terminals) are data input and output devices that are used to communicate with a nearby access point. EVDO devices may or may not include removable user identity modules (UIMs) that hold service subscription information. The common types of available EVDO devices include external radio modems, PCMCIA cards, radio modules, and dual mode mobile telephones.

User Identity Module (UIM)

A user identity module (UIM) is an optional small "information" card that contains service subscription identity and personal information. This information includes a phone number, billing identification information and a small amount of user specific data (such as feature preferences and short messages). This information can be stored in the card rather than programming this information into the phone itself. This intelligent card, either credit card-sized (ISO format), or the size of a postage-stamp (Plug-In format), can be inserted into any UIM ready wireless device.

External Modems (USB or Ethernet)

External radio modems allow the customer to simply plug in their EVDO device to their USB or Ethernet data port to their desktop or laptop computer. An external modem is a self contained modulator/demodulator (MODEM) that can be connected to a computer or other data processing equipment. External modems are commonly connected to computers via standard connections such as universal serial bus (USB) or RJ-45 Ethernet connections.

PCMCIA Air Cards

EVDO PCMCIA cards can be added to most laptop computers or embedded radio modules which allow devices such as PDAs and Laptops to integrate high-speed wireless without...

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Products & Services
PCMCIA Modems and PCMCIA Fax Modems
PCMCIA modems and PCMCIA fax modems enable computers to transmit data over telephone lines. They include modem-only devices, modem and fax combinations, and fax/modem products with networking capabilities.
PCMCIA Card Readers and Writers
PCMCIA card readers and PCMCIA card writers allow a user to transfer data from or to a host computer to or from a PCMCIA card.
Wireless Modems
Wireless modems transmit modulated data using electromagnetic waves.
PCMCIA Cards and Accessories
PCMCIA cards and accessories follow standards developed by the Personal Computer Memory Card International Association (PCMCIA), an international standards body and trade organization. PCMCIA cards, or PC cards as they are commonly known, were designed originally for adding memory to portable computers, but are now used in a variety of devices.
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.

Topics of Interest

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