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RF Modems
Wireless modems provide for two way communication
between devices that are able to handle serial communications.
The lower cost wireless modems provide for point-to-point
communications. Some more expensive wireless modems
provide for multipoint communications. The transmission
includes a destination address followed by the data.
Therefore, these devices have to be configured to accept
this protocol.
Wireless modems are external to the portable device
and have belt and battery packs that usually weigh
approximately one or two pounds. These modems generally
require an intelligent PDT such as a DOS compatible
terminal that is able to support serial data communication.
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