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ARDIS is a private network two way data service owned by Motorola and presently operational. It provides coverage to major metropolitan areas in the U.S.; there is no international access. Terminal / handset cost is ~ $4000; the design is old-fashioned. ARDIS has the ability to support a wide array of uses, but the user cost is high.
operating frequency range: 800 MHz band, with 45 kHz transmit/receive separation
RF channel spacing: 25 kHz
Channel Access: FDMA/DSMA (Data Sense Multiple Access)
Multi-user access: DSMA
Modulation Method: FSK
channel bit rate: 19.2 kbps
packet length: <256 Bytes
closed architecture
private carrier
Metro coverage in 400 US cities
in-building and mobile coverage
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