- Integrated Processor-radio
- FHSS and DSSS Spread Spectrum
- Multiple Bands, Multiple Frequencies
- Muti-year Battery-life
The radio technology used in Crossbow's wireless modules supports domestic and international
frequency bands in the 433 MHz, 868-915 MHz, and 2.4 GHz bands. Multiple channels
are available in each band under software control, resulting in a flexible solution
for customer applications. Two modulation formats are available, two-tone Frequency-Shift-Keyed
(FSK) at 433 and 868-915 MHz, and direct sequence spread spectrum (DSSS) at 2.4
GHz supporting the 802.15.4/ZigBee standard. All radios are bidirectional (half-duplex),
and support a range of 30 to 1000 feet (10 to 100 meters) using XMesh with low-power
protocol and battery-life time of 5 plus years in commercial applications. Transmit
power levels are software controlled to enable end users to comply with local government
regulations for frequency transmission.
The processor has full control of radio features, and can control parameters such
as transmit/receive mode switching, channel selection, output power, and radio standby
mode. Data packets routed through the radio are error correction encoded, with the
ability to listen to the channel via RSSI measurement to determine if the channel
is clear to send data. Depending on choice of radio and configuration, data rates
of 19.2kbps to 240kbps are available. Both the radio and processor support deep
sleep modes for maximum power savings. The motes are designed to support battery
operation from 2.4V to 3.6V, with an integral battery voltage monitor.
Processor-Radio Key Features:
- Multiple bands supported (433 MHz, 868-915 MHz, 2.4 GHz)
- Bidirectional communication (Half-Duplex)
- Multiple transmit power levels
- Multiple data rates
- Power savings modes
- Optimized for battery operation
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